WO2012026158A1 - Rotary electric machine and stator core manufacturing device for manufacturing stator core thereof - Google Patents

Abstract

The purpose of the present invention is to obtain a rotary electric machine capable of simultaneously achieving reductions in cogging torque and torque ripple and an increase in torque. This rotary electric machine is an electric machine (1A) which is provided with a rotor (2) and a stator (5) comprising a stator core (6A) disposed coaxially with the rotor (2) so as to surround the rotor (2), the stator core (6A) being provided with a yoke (7) which is disposed coaxially with the rotor (2), and a plurality of teeth (8) which are each configured from a tooth base portion (8a) protruding between both ends in the axial direction of the yoke (7) and tooth brim portions (8b, 8c) protruding from the front end of the tooth base portion (8a) to both sides and are arranged at intervals therebetween in the circumferential direction of the yoke (7), and an opening of a slot (10) formed between the adjacent teeth (8) being skewed with respect to the axial direction of the yoke (7), wherein the widths of the tooth brim portions (8b, 8c) each become narrower from a connection with the tooth base portion (8a) toward the front end.

Description

Rotating electric machine and stator core manufacturing apparatus for manufacturing the stator core

The present invention relates to, for example, a rotating electrical machine such as an electric motor and a stator core manufacturing apparatus for manufacturing the stator core.

As an electric motor, one having a rotor and a stator arranged so as to surround the rotor is widely known.
As a conventional stator used in this type of electric motor, a plurality of yoke parts that are connected in an annular manner via connecting means whose edges are rotatable, and a central part in the connecting direction of each yoke part, respectively, By sequentially laminating a plurality of annular magnetic members having magnetic teeth formed so that the magnetic pole portions protrude so that the protruding lengths increase or decrease by the same length sequentially in the stacking direction on both sides, A device including a core member formed so that the gap is skewed with respect to the stacking direction and a plurality of coil members wound around each magnetic pole tooth portion of the core member has been proposed (for example, see Patent Document 1). ).

A rotating electrical machine using a conventional stator is manufactured by arranging the rotor and the conventional stator coaxially so that a predetermined gap is formed between the outer peripheral surface of the rotor and the magnetic pole teeth.
In the electric motor configured as described above, the gap between the adjacent magnetic pole portions is skewed with respect to the stacking direction of the annular magnetic member (the axial direction of the core member), so torque ripple at start-up and cogging torque during operation Can be reduced.

Japanese Patent No. 4121008

However, in the core member of the conventional stator, the magnetic pole portion extends with the same width from the base end portion to the tip end portion.
Here, in a rotating electrical machine using a core member with a wide magnetic pole part, torque decreases due to an increase in leakage magnetic flux, and in a rotating electrical machine using a core member with a narrow magnetic pole part, magnetic saturation occurs in the magnetic pole part. As a result, cogging torque and torque ripple increase.
For this reason, in a motor using a conventional stator, it is impossible to realize both reduction of cogging torque and torque ripple, and increase of torque.

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a rotating electrical machine and a stator core manufacturing apparatus capable of simultaneously reducing cogging torque and torque ripple and increasing torque.

The present invention includes a rotor and a stator having a stator core coaxially disposed on the rotor so as to surround the rotor. The stator core includes a yoke coaxially disposed on the rotor, and an axial direction of the yoke. Consists of a teeth base projecting between both ends and a teeth collar projecting to both sides from the tip of the teeth base, and a plurality of teeth arranged adjacent to each other in the circumferential direction of the yoke. The opening of the slot formed between the teeth is a rotating electrical machine that is skewed with respect to the axial direction of the yoke, and the width of the teeth flange portion decreases from the connecting portion between the teeth base portion and the teeth flange portion toward the tip. Yes.

According to the rotating electrical machine of the present invention, since the width of the teeth ridge is narrowed from the connecting portion of the teeth base and the teeth ridge toward the tip of the teeth ridge, the cogging torque and torque ripple are reduced, and the torque Both increases can be realized.

1 is a top view of an electric motor according to Embodiment 1 of the present invention. It is a perspective view of the stator core which comprises the electric motor which concerns on Embodiment 1 of this invention. It is principal part sectional drawing of the stator which comprises the electric motor which concerns on Embodiment 1 of this invention. It is the A section enlarged view of FIG. It is a principal part enlarged view of the stator which comprises the electric motor which concerns on Embodiment 2 of this invention. It is a figure which shows the result of having measured the relationship between the cogging torque of the electric motor which concerns on Embodiment 1 and 2 of this invention, and the rotation angle of a rotor. It is a figure which shows the analysis result of the cogging torque measured with the electric motor which concerns on Embodiment 1 and 2 of this invention, The component of the cogging torque by the working error of a rotor, The component of the cogging torque resulting from the number of poles / slot, And the maximum amplitude of the cogging torque. It is a principal part expanded sectional view of the stator which comprises the electric motor which concerns on Embodiment 3 of this invention, and has shown the cross section of the site | part of the stator located in the one end side vicinity of the axial direction of a yoke. It is a figure which shows the relationship between the skew angle with respect to the axial direction of the yoke of the slot opening of the electric motor which concerns on Embodiment 4 of this invention, and a skew coefficient. It is a perspective view of the core member of the stator manufactured using the manufacturing apparatus of the core member of the stator which concerns on Embodiment 5 of this invention. It is a top view of the core member of the stator manufactured using the manufacturing apparatus of the core member of the stator which concerns on Embodiment 5 of this invention. It is the principal part front view which looked at the core member of the stator manufactured using the manufacturing apparatus of the core member of the stator which concerns on Embodiment 5 of this invention from the inner peripheral side. It is the B section enlarged view of FIG. It is a side view of the manufacturing apparatus of the core member of the stator which concerns on Embodiment 5 of this invention. It is a top view of the manufacturing apparatus of the core member of the stator which concerns on Embodiment 5 of this invention. It is principal part side sectional drawing of the 2nd press mechanism of the manufacturing apparatus of the core member of the stator which concerns on Embodiment 5 of this invention. It is a top view explaining the operation | movement of the manufacturing apparatus of the core member of the stator which concerns on Embodiment 5 of this invention, and the process of forming the division | segmentation core member which comprises an annular magnetic member. In the stator core member manufacturing apparatus according to Embodiment 5 of the present invention, the shape of the rotationally moving mold for punching out the teeth flange portion of the split core member into a contour having a predetermined protruding length is described. . It is a top view of the core member of the stator manufactured using the manufacturing apparatus of the core member of the stator which concerns on Embodiment 6 of this invention. It is a top view explaining the shape of the 1st metal mold | die of the manufacturing apparatus of the core member of the stator which concerns on Embodiment 6 of this invention, and has shown a mode that the predetermined site | part of the steel plate is punched out. It is a perspective view of the core member of the stator manufactured using the manufacturing apparatus of the stator core member of the invention which concerns on Embodiment 7 of this invention. It is a side view of the manufacturing apparatus of the core member of the stator which concerns on Embodiment 7 of this invention. It is a top view of the manufacturing apparatus of the core member of the stator which concerns on Embodiment 7 of this invention. It is principal part side sectional drawing of the 2nd press mechanism of the manufacturing apparatus of the core member of the stator which concerns on Embodiment 7 of this invention. It is a top view explaining the operation | movement of the manufacturing apparatus of the core member of the stator which concerns on Embodiment 7 of this invention, and the process of forming the division | segmentation core member which comprises an annular magnetic member. It is a top view explaining the shape of the linear movement metal mold | die of the manufacturing apparatus of the core member of the stator which concerns on Embodiment 7 of this invention. It is a top view explaining the shape of the 1st metal mold | die and rotational movement metal mold | die of the manufacturing apparatus of the stator core member of the invention concerning Embodiment 8 of this invention, and a 1st metal mold | die and a rotational movement metal mold | die are steel plates. A state in which a predetermined part is punched is shown. It is a top view of the core member of the stator manufactured by the manufacturing apparatus of the stator core member of the invention concerning Embodiment 9 of this invention. It is a figure explaining the shape of the rotational movement metal mold | die of the manufacturing apparatus of the core member of the stator which concerns on Embodiment 9 of this invention.

Hereinafter, the best mode for carrying out the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
1 is a top view of an electric motor according to Embodiment 1 of the present invention, FIG. 2 is a perspective view of a stator core that constitutes the electric motor according to Embodiment 1 of the present invention, and FIG. 3 is according to Embodiment 1 of the present invention. FIG. 4 is an enlarged view of a portion A in FIG. 3.

1, an electric motor 1 </ b> A as a rotating electric machine includes a rotor 2 that is integrally attached to a rotating shaft (not shown), and a stator 5 that is disposed so as to surround the rotor 2.

The rotor 2 includes a columnar or cylindrical rotor core 3 and a plurality of permanent magnets 4 attached to the outer peripheral surface of the rotor core 3 at a predetermined pitch in the circumferential direction. Here, the number of permanent magnets 4, that is, the number of field poles (number of poles) of the rotor 2 is ten. As the permanent magnet 4, a ferrite magnet, a neodymium magnet, a samarium cobalt magnet, or the like is used.

The stator 5 includes a stator core 6A disposed coaxially with the rotor 2 so as to surround the rotor 2, and a stator winding 12 wound around the stator core 6A.

As shown in FIGS. 2 to 4, the stator core 6A includes an annular yoke 7 and a plurality of teeth 8 protruding from the inner peripheral surface of the yoke 7 in the circumferential direction at intervals. . Here, the number of teeth 8 is twelve. The plurality of teeth 8 are continuous from one end to the other end in the axial direction of the yoke 7 so as to connect both ends.

Each tooth 8 protrudes in the circumferential direction of the yoke 7 from the inner peripheral surface of the yoke 7 from the both sides in the width direction of the tooth base portion 8a protruding in the circumferential direction of the yoke 7 and the distal end portion of the teeth base portion 8a. Teeth collars 8b and 8c facing the yoke 7 are provided.

The slot 10 is formed by a space defined by the adjacent teeth 8 and the yoke 7. More specifically, the slot 10 is located at a portion of the adjacent tooth base 8a, the teeth flanges 8b and 8c extending from the teeth base 8a in a direction opposite to each other, and the yoke 7 located between the adjacent tooth bases 8a. It is formed by a partitioned space. At this time, the protruding amount of the tooth flange portions 8b and 8c from the tooth base portion 8a is different from one end in the axial direction of the yoke 7 so that the slot opening 10a is skewed at a predetermined angle with respect to the axial direction of the yoke 7. It gradually changes toward the end. Further, the slot opening 10a extends from one end to the other end in the axial direction of the yoke 7 (axial direction of the stator core 6A) so that the angle with respect to the axial direction of the yoke 7 becomes the same angle.

And in the cross section orthogonal to the axial direction of the yoke 7, as shown in FIG.3 and FIG.4, the teeth collar parts 8b and 8c become narrow toward the front-end | tip from the connection part with the teeth base part 8a. Is formed.
Here, the teeth flanges 8b and 8c have the same width from the connecting portion with the teeth base 8a to the vicinity of the tip, and the tips of the teeth flanges 8b and 8c are related to the radial direction of the yoke 7, The protrusions from the teeth base 8a are formed so as to increase from the yoke 7 side (outer peripheral side) to the inner peripheral side. Thereby, the space | interval La of the outer peripheral side of adjacent teeth ridge part 8b, 8c becomes larger than the space | interval Lb of an inner peripheral side.

As shown in FIG. 2, the stator core 6 </ b> A having the above shape is configured as a laminated body in which a plurality of plate-like annular magnetic members 15 made of silicon steel are laminated in respective thickness directions.

Each of the annular magnetic members 15 includes a ring plate-shaped yoke structure 16 and twelve divided teeth 17 that protrude from the inner peripheral surface of the yoke structure 16 at intervals in the circumferential direction.

Each of the divided teeth 17 includes a divided tooth base portion 17a protruding from the inner peripheral surface of the yoke component 16, and a divided tooth flange portion protruding substantially in the circumferential direction of the yoke component 16 on both sides of the tip of the divided tooth base portion 17a. 17b, 17c. The cross-sectional shape of the annular magnetic member 15 perpendicular to the thickness direction naturally matches the cross-sectional shape of the stator core 6A.

Further, the distal end surface of the divided tooth base portion 17a and the inner peripheral surfaces (surfaces opposite to the yoke component 16) of the divided tooth flange portions 17b and 17c are on the same curved surface having a slightly larger radius of curvature than the radius of the rotor core 3. positioned. The distance from the axial center of the yoke structure 16 to the distal end surface of the divided tooth base portion 17a and the inner peripheral surface of the divided tooth flanges 17b and 17c is greater than the distance from the axial center of the rotor core 3 to the outer peripheral surface of the permanent magnet 4. It is set slightly longer.

Further, the protruding lengths of the divided teeth flange portions 17 b and 17 c from the divided tooth base portion 17 a are different for each annular magnetic member 15. At this time, the protruding length of the divided teeth flanges 17b and 17c from the divided tooth base 17a is set to a length that is gradually increased or decreased by the same length in the order of the laminated annular magnetic members 15.
Then, by laminating the plurality of annular magnetic members 15 as described above coaxially, the yoke 7 and the teeth 8 are formed by the yoke structure 16 and the divided teeth 17 constituting the plurality of laminated annular magnetic members 15. Thus, the stator core 6A is obtained in which the slot opening 10a is skewed with respect to the stacking direction of the annular magnetic member 15, in other words, the axial direction of the yoke 7.

Further, the same number of stator windings 12 as the teeth 8 are prepared and wound around the tooth bases 8 a of the respective teeth 8. That is, the stator winding 12 is provided on the teeth 8 by a magnetic pole concentrated winding method.

The stator 5 as described above is disposed coaxially with the rotor 2 so as to surround the rotor 2 so as to be predetermined between the permanent magnet 4 and the teeth base 8a and the teeth flanges 8b and 8c. An electric motor 1A having an air gap is obtained. Further, by passing a current through the stator winding 12, the permanent magnets 4 adjacent in the circumferential direction are magnetized in opposite polarities, and the torque of the rotor 2 is controlled by controlling the current of the stator winding 12. Can be controlled to a desired size.

According to the electric motor 1A of the first embodiment, the width of the teeth flange portions 8b and 8c of the stator core 6A is from the connecting portion of the teeth base portion 8a and the teeth flange portions 8b and 8c toward the tips of the teeth flange portions 8b and 8c. It is narrower. For this reason, it is possible to reduce the leakage magnetic flux by narrowing the tip end portions of the teeth flange portions 8b and 8c while increasing the base end portions of the teeth flange portions 8b and 8c to alleviate magnetic saturation. That is, in the electric motor 1A, both reduction of cogging torque and torque ripple and increase of torque can be realized.

In the first embodiment, it has been described that the slot opening 10a is skewed so that the angle with respect to the axial direction of the yoke 7 takes the same angle from one end to the other end of the yoke 7 in the axial direction. However, the method of skewing the slot opening 10a with respect to the axial direction of the yoke 7 is not limited to this. For example, the slot opening 10 a is formed to be zigzag in a triangular wave shape or a sine wave shape from one end of the yoke 7 in the axial direction to the other end, and the slot opening 10 a is skewed with respect to the axial direction of the yoke 7. May be. That is, the slot opening 10a may be skewed with respect to the yoke 7 so that an angle with respect to the axial direction of the yoke 7 changes from one axial end to the other end. By forming the slot opening 10a in a zigzag manner, for example, even if a thrust force that is biased in any of the axial directions with respect to the axial direction of the yoke 7 occurs due to a manufacturing error of the rotor 2, the thrust force can be reduced. Can do.

Embodiment 2. FIG.
FIG. 5 is an enlarged view of a main part of the stator constituting the electric motor according to Embodiment 2 of the present invention.
In FIG. 5, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

In FIG. 5, the teeth 8 of the stator core 6 </ b> B constituting the electric motor 1 </ b> B have teeth flange portions 8 d and 8 e instead of the teeth flange portions 8 b and 8 c.
The teeth flanges 8d and 8e are formed in the same manner as the teeth flanges 8b and 8c, except that the base end side portion is made to gradually increase in width toward the connecting portion with the teeth base 8a. ing. That is, in the electric motor 1A, the teeth ridges 8b and 8c are formed to have the same width from the connecting portion (base end) to the teeth base 8a to the vicinity of the tip, but in the electric motor 1B, the teeth ridges The base end side of 8d and 8e is wider than the middle part of the teeth flanges 8d and 8e.
The configuration of the other electric motor 1B is the same as that of the first embodiment.

According to the electric motor 1B of the second embodiment, similarly to the electric motor 1A, the width of the teeth flanges 8d, 8e is from the connecting portion of the teeth base 8a and the teeth flanges 8b, 8c to the tips of the teeth flanges 8b, 8c. It becomes narrower.
Therefore, in the electric motor 1B manufactured using the stator core 6B, both the reduction of the cogging torque and the torque ripple and the increase of the torque can be realized as in the electric motor 1A.

Furthermore, in the electric motor 1B, the base end sides of the tooth flanges 8d and 8e are formed so that the width gradually increases toward the connecting portion with the teeth base 8a. Thereby, the cogging torque can be further reduced.

Next, a result of measuring the cogging torque of the electric motors 1A and 1B and an analysis result thereof will be described.
FIG. 6 is a diagram showing a result of measuring the relationship between the cogging torque of the electric motor according to the first and second embodiments of the present invention and the rotation angle of the rotor, and FIG. 7 is a diagram according to the first and second embodiments of the present invention. It is a figure which shows the analysis result of the cogging torque measured with the electric motor, and has shown the component of the cogging torque by the working error of the rotor, the component of the cogging torque resulting from the number of poles / slots, and the maximum amplitude of the cogging torque.

In FIG. 6, the horizontal axis represents the rotation angle of the rotor 2, and the vertical axis represents the magnitude of the cogging torque.
Note that the magnitude of the cogging torque is shown as a standard value that is normalized with the maximum value of the cogging torque when the rotor 2 is rotated once as one.

Here, the number of slots 10 of the stator cores 6A and 6B of the electric motors 1A and 1B is twelve. In such a case, if a part of the rotor 2 is distorted with respect to a desired shape, when the rotor 2 is rotated in one direction, the rotation angle of the rotor 2 is set to 30 °, which is the arrangement interval of the slots 10. A cogging torque component is generated that oscillates as a cycle.

Further, the number of poles of the rotor 2 of the electric motors 1A and 1B is ten. In this case, it is known that a component of cogging torque that repeats the amplitude only 60 times, which is the least common multiple of the number 12 of the slot 10 and the number 10 of the poles of the rotor 2, is generated during one rotation of the rotor 2. That is, when the rotor 2 is rotated in one direction, a cogging torque component is generated that has an amplitude with a period of 6 ° as the rotation angle of the rotor 2.

It is possible to analyze the waveform shown in FIG. 6 and derive the magnitude of the cogging torque component having a period of 30 ° and the cogging torque component having a period of 6 ° with respect to the rotation angle of the rotor 2. At this time, the magnitude of the cogging torque component that swings with a rotation angle of the rotor 2 at a cycle of 30 ° corresponds to that caused by a work error of the rotor 2 (distortion or variation with respect to a desired dimension), and a cycle of 6 °. The magnitude of the cogging torque component that swings at is equivalent to the fluctuation due to the number of poles and the number of slots.

And about the motor 1A and the motor 1B, the magnitude | size of the component of the cogging torque resulting from the working error of the rotor 2, the magnitude | size of the component of the cogging torque which fluctuates due to the number of poles / slots, and one rotation of the rotor 2 FIG. 7 shows the magnitude of the amplitude (Peak-Peak value) when it is set.

In FIG. 7, it can be seen that in the prepared electric motors 1A and 1B, the cogging torque component caused by the machining error of the rotor 2 is the main component of the measured cogging torque amplitude.
In the electric motor 1B, compared with the electric motor 1A, the cogging torque component due to the working error of the rotor 2 is greatly reduced. For this reason, the amplitude of the cogging torque observed when the rotor 2 is rotated once. The size has greatly decreased.

Consider the above results.
In the electric motor 1B, the base end sides of the tooth flange portions 8d and 8e are formed so that the width becomes wider toward the connecting portion with the teeth base portion 8a.
Here, the connecting portion between the tooth base portion 8 a and the tooth flange portions 8 d and 8 e is a place where magnetic saturation is most likely to occur in the tooth 8. That is, in such a place, the degree of magnetic saturation changes sensitively due to variations in the working error of the rotor 2 and the magnet residual density, and cogging torque and torque ripple are likely to occur.

Like the stator core 6B of the electric motor 1B, the base end sides of the teeth flanges 8d and 8e are formed wide toward the connecting portion with the teeth base 8a, so that magnetic saturation is unlikely to occur and the work of the rotor 2 is performed. It is determined that the component of cogging torque resulting from the error is significantly reduced.
As described above, the electric motor 1B according to the second embodiment can obtain a further effect of reducing the cogging torque than the electric motor 1A.

Embodiment 3 FIG.
FIG. 8 is an enlarged cross-sectional view of the main part of the stator constituting the electric motor according to Embodiment 3 of the present invention, and shows a cross section of a portion of the stator located in the vicinity of one end side in the axial direction of the yoke.
In FIG. 8, the same or corresponding parts as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and illustration of the stator winding is omitted for convenience of description.

In FIG. 8, the electric motor 1C is configured in the same manner as the electric motor 1A, except that the stator core 6C is provided instead of the stator core 6A.
With respect to the axial direction of the yoke 7, the slot opening 10 a is formed so as to enter the teeth base portion 8 a located on one end side.

The entry of the slot opening 10a into the teeth base 8a refers to the following. This means that the opening of the slot is formed so that the width on the distal end side of the teeth base portion 8a is narrower than the width on the proximal end side of the teeth base portion 8a.
Although not shown, on the other end side of the yoke 7 in the axial direction, the slot opening 10a enters the teeth base 8a formed so that the slot opening 10a enters on one end side and the teeth base 8a facing in the circumferential direction. It is formed as follows. That is, one end and the other end of the slot opening 10a skewed at the same angle with respect to the axial direction of the yoke 7 enter the teeth base 8a throughout the entire length direction.
The configuration of the other electric motor 1C is the same as that of the electric motor 1A.

Here, with respect to the circumferential direction of the yoke 7, the slot opening 10 a at one end in the axial direction of the yoke 7, in other words, at the position in the axial direction of the yoke 7 where the slot opening 10 a most entering the teeth base 8 a is located. An angle between the center in the width direction and the center between the pair of teeth bases 8a constituting the slot 10 having the slot opening 10a is defined as a °.

That is, the slot opening 10a is formed so as to occupy an angular width corresponding to 2a ° in the circumferential angle of the yoke 7.
If the slot opening 10a is not allowed to enter the teeth base portion 8a, the value of a becomes small.
That is, the skew angle of the slot opening 10a when the slot opening 10a enters the teeth base portion 8a can be larger than that at which the slot opening 10a does not enter the teeth base portion 8a.

Therefore, according to the electric motor 1C of the third embodiment, since the skew angle of the slot opening 10a can be increased, the cogging torque and torque having a lower frequency component than those in which the slot opening 10a does not enter the teeth base 8a. Ripple can be reduced.

According to the third embodiment, the slot opening 10a has been described as extending over the entire length direction with the same skew angle with respect to the axial direction of the yoke 7. 7 is extended in a zigzag from one end to the other end in the axial direction, the portion corresponding to the peak portion of the slot opening 10a enters the teeth base portion 8a, and the skew angle of the slot opening 10a is increased. I can take it big. That is, since the teeth 8 are formed so that the opening of the slot 10 enters the teeth base portion 8a at a predetermined portion in the axial direction of the yoke 7, the skew angle of the slot opening 10a with respect to the axial direction of the yoke 7 can be increased. It becomes possible to reduce the torque ripple of the low frequency component.

Embodiment 4 FIG.
FIG. 9 is a diagram showing the relationship between the skew angle and the skew coefficient with respect to the axial direction of the yoke of the slot opening of the electric motor according to Embodiment 4 of the present invention.

The electric motor according to the fourth embodiment is assumed to be the same as that of the electric motor 1A. In addition, the number of poles and the number of slots are not limited to 10 and 12, but any of those in which Z is a natural number, the number of poles is set to 10Z, and the number of slots is set to 12Z is used.
The skew angle of the slot opening 10a is set to ± (3k / Z) ° where k is 1, 2, or 3.

In FIG. 9, the horizontal axis represents the skew angle of the slot opening 10a, and the vertical axis represents the theoretical value of the skew coefficient with respect to the skew angle of the slot opening 10a.
The skew coefficient is expressed as a theoretical value of the cogging torque with respect to the skew angle of the slot opening 10a when the magnitude of the amplitude of the cogging torque when the skew angle of the slot opening 10a is zero.

For example, when the stator core 6A has a machining error with respect to a desired shape, a cogging torque is generated due to the machining error of the stator core 6A. This cogging torque is the interval between the first component and the half of the first component with respect to the rotation angle of the rotor 2, with an interval of (36 / Z) ° that is the arrangement interval of the permanent magnets 4 (18 / Z) has a second component that has an amplitude with a period of °.
In FIG. 9, the first component of the cogging torque resulting from the machining error of the stator core 6A is indicated by a bold line, and the second component is indicated by a broken line.
In addition, the cogging torque components resulting from the number of poles and the number of slots when the number of poles: number of slots = 10: 12 are indicated by thin lines.

As shown in FIG. 9, the value of the skew coefficient theoretically significantly reduces the cogging torque component due to the number of poles and the number of slots when the skew angle is ± (3 k / Z) °.
Therefore, according to the fourth embodiment, since the skew angle of the slot opening 10a is set to ± (3 k / Z) °, the cogging torque can be effectively reduced.

Here, in the motor 1A having a slot number of 12Z, a mechanical angle (hereinafter, referred to as a mechanical angle per slot) of the yoke 7 per slot including the tooth base portion 8a that defines the slot 10 is (30). / Z) °.
In addition, regarding the teeth base 8a that partitions adjacent slots 10, one side and the other side of the center in the width direction are regarded as partitioning one and the other slots 10, respectively. That is, one tooth base 8a is included in the mechanical angle per slot.

In a general electric motor, of the mechanical angles per slot, the angle occupied by the tooth base 8a is (15 / Z) ° to (20 / Z) °.
Therefore, in the electric motor in which the slot opening 10a is skewed without entering the teeth base 8a, it is difficult to set the skew angle of the slot opening 10a to ± (6 / Z) °, ± (9 / Z) °. Become. On the other hand, as in the electric motor 1C of the third embodiment, the slot opening 10a on one end and the other end side in the axial direction is inserted into the tooth base 8a, so that the skew angle of the slot opening 10a is ± (6 / Z). It can be easily set to °, ± (9 / Z) °.

The electric motor according to the fourth embodiment has been described in the electric motor 1A, in which the number of poles is 10Z, the number of slots is 12Z, and the skew angle is set to ± (3k / Z) °. In the electric motor of 3, the number of poles may be 10Z, the number of slots may be 12Z, and the skew angle may be set to ± (3k / Z) °.

In each of the above embodiments, the rotating electric machine is described as being the electric motors 1A to 1C. However, the rotating electric machine may be a generator including a stator and a rotor having the same configuration as each of the embodiments.

Embodiment 5 FIG.
In the above description, the stator core 6 </ b> A is configured by laminating a plurality of plate-like annular magnetic members 15.
As the stator core (core member of the stator), for example, two kinds of annular magnetic members may be prepared as follows, and the two kinds of annular magnetic members may be alternately stacked. Below, a stator core is demonstrated as a core member of a stator.

First, prior to the description of the stator core member manufacturing apparatus, the configuration of the stator core member manufactured using the stator core member manufacturing apparatus will be described.
10 is a perspective view of a stator core member manufactured using a stator core member manufacturing apparatus according to Embodiment 5 of the present invention, and FIG. 11 is a view of a stator core member according to Embodiment 5 of the present invention. FIG. 12 is a plan view of a stator core member manufactured using the manufacturing apparatus, and FIG. 12 shows the stator core member manufactured using the stator core member manufacturing apparatus according to Embodiment 5 of the present invention from the inner peripheral side. FIG. 13 is an enlarged view of part B of FIG. 11.

10 to 13, the core member 101A of the stator is formed by connecting, for example, a plurality of plate-like first annular magnetic members 102A and second annular magnetic members 102B made of silicon steel in the respective thickness directions. It is comprised as a laminated body.

Each of the first annular magnetic members 102A includes a plurality of divided core members 103 arranged in an annular shape. Here, the number of the split core members 103 constituting the first annular magnetic member 102A is 12, but the number of the split core members 103 is not particularly limited.
The split core member 103 protrudes in a direction perpendicular to the thickness direction of the split yoke 104 from the split yoke 104 made in the shape of a long flat plate and an intermediate portion between one end and the other end of the split yoke 104 in the longitudinal direction. The divided teeth base 105a and the divided teeth 105 having divided teeth flanges 105b and 105c projecting in a direction substantially parallel to the divided yoke 104 (circumferential direction of the divided yoke 104) on both sides of the tip of the divided teeth base 105a. Is done.

In addition, the main part of the other side facing the one side of the divided yoke 104 from which the divided tooth base portion 105a protrudes is formed in an arc shape having a predetermined radius of curvature. Further, in the vicinity of one end of the divided yoke 104, a connecting portion 104a is formed in which one surface side is a convex portion and the other surface side is a concave portion.

As shown in FIG. 13, the divided teeth flanges 105 b and 105 c are formed such that the width Wb of the distal end is narrower than the width Wa on the base end side connected to the divided teeth base 105 a, and the divided teeth flange The widths 105b and 105c are narrowed from the base end portion toward the tip end portion. Here, from the base end portions of the divided teeth flange portions 105b and 105c to the portions in the vicinity of the distal end, the divided teeth flange portions 105b and 105c are formed to have the same width.
The first annular magnetic member 102 </ b> A is configured by arranging a plurality of divided core members 103 such that the divided yokes 104 are arranged in a ring shape and the divided tooth base portion 105 a is disposed inside the divided yoke 104. That is, in the first annular magnetic member 102A, the divided yoke 104 is connected along the connecting direction of the divided core member 103, and the divided tooth base 105a is divided from the intermediate portion of each divided yoke 104 with respect to the connecting direction of the divided yoke 104. It protrudes inside the yoke 104.

Further, each of the second annular magnetic members 102B is composed of a plurality of divided core members 103 arranged in an annular shape, like the first annular magnetic member 102A. The split core member 103 of the second annular magnetic member 102B is divided from the first annular magnetic member 102A except that the connecting portion 104a is formed near the other end opposite to one end of the split yoke 104 in the longitudinal direction. The configuration is the same as that of the core member 103.

Each of the first and second annular magnetic members 102A and 2B includes a plurality of divided core members 103 arranged in an annular shape so that one end and the other end of the divided yoke 104 of the adjacent divided core member 103 are arranged next to each other. It is configured. At this time, the outer shapes of the first and second annular magnetic members 102A and 102B are circles having a radius of curvature equal to the radius of curvature of the other side of the divided yoke 104 formed in an arc shape. Further, a flat and annular (flat plate-shaped) yoke structure 108 is constituted by divided yokes 104 arranged in an annular shape.

Then, as described above, the stator core member 101A is formed by alternately stacking the first and second annular magnetic members 102A and 102B by fitting the connecting portions 104a to each other so that the divided tooth base portions 105a overlap each other. Configured as a laminate. Each split core member 103 is formed with an end portion of the split yoke 104 so as to be rotatable around the connecting portion 104a.

At this time, the protruding lengths of the divided teeth flange portions 105b and 105c from the tip of the divided tooth base portion 105a to the one side and the other side in the width direction of the divided tooth base portion 105a are different for each layer. The protruding lengths of the first and second annular magnetic members 102A and 102B from the divided tooth base portions 105a of the divided teeth flange portions 105b and 105c are set so as to satisfy the following conditions.

That is, the protruding lengths of the divided teeth flange portions 105b and 105c from the divided tooth base portion 105a of the divided teeth 105 are first to the other side in the stacking direction of the first and second annular magnetic members 102A and 102B. Each time the layers of the first and second annular magnetic members are changed, the gap is sequentially increased and a gap formed between the tips of the adjacent divided teeth flange portions 105b and 105c continues from one end to the other end of the stator core member 101A. It is set to be.

Also, in the stator core member 101A configured as described above, the cylindrical yoke is configured by the yoke structure 108 of the first and second annular magnetic members 102A and 102B stacked. Further, teeth that protrude in the axial direction of the yoke at intervals from each other in the circumferential direction of the yoke are constituted by the divided teeth 105 of the first and second annular magnetic members 102A and 102B that are stacked.

The slot 107 is located between the divided tooth base 105a of the adjacent divided teeth 105, the divided teeth flanges 105b and 105c extending from the divided teeth base 105a in the direction opposite to each other, and the adjacent divided teeth base 105a. A space surrounded by a portion of the yoke 104 is formed. And the slot opening 107a comprised by the clearance gap between adjacent division | segmentation teeth rib parts 105b and 105c is a lamination direction toward the other side from the one side of the lamination direction of 1st and 2nd annular magnetic member 102A, 102B. Is skewed against.

Next, an apparatus for manufacturing the core member of the stator will be described.
14 is a side view of a stator core member manufacturing apparatus according to Embodiment 5 of the present invention, FIG. 15 is a plan view of a stator core member manufacturing apparatus according to Embodiment 5 of the present invention, and FIG. It is principal part sectional drawing of the 2nd press mechanism of the manufacturing apparatus of the core member of the stator which concerns on Embodiment 5 of invention.

14 and 15, the stator core member manufacturing apparatus 110A includes a first press mechanism 111A and a second press mechanism 111B as a moving mold mechanism.
The first press mechanism 111A includes an upper base plate 117 and a lower base plate 118 that are disposed so as to be opposed to each other vertically, and a long steel plate 119 made of silicon steel between the upper base plate 117 and the lower base plate 118 in a predetermined direction (FIG. 14). A conveyance mechanism (not shown) that conveys in the direction of the arrow in the middle, and an upper mold 113A and a lower mold 113B that are disposed on the upstream side in the conveyance direction of the steel plate 119 and are installed on the upper base plate 117 and the lower base plate 118. The first die 112A for punching or crimping a predetermined portion of the steel plate 119, and the first die 112A at a predetermined interval on the downstream side in the conveying direction of the steel plate 119, and the upper base plate 117 and A second mold 114A that is formed of an upper mold 115A and a lower mold 115B installed on the lower base plate 118 and punches a predetermined portion of the steel plate 119;

In addition, as shown in FIG. 16, the second press mechanism 111 </ b> B has the axial direction orthogonal to both the front and back surfaces of the steel plate 119 conveyed on the lower base plate 118, at a position corresponding to the central portion in the width direction of the steel plate 119. The thrust bearing 121 disposed on the lower base plate 118 is supported by the thrust bearing 121 and is disposed so as to be rotatable around the axial center of the thrust bearing 121. A linear motor 124 that generates torque to rotate around the axis of 121 and a rotary moving table 122 are driven by the servo motor 126 via the lower die 128B and the crankshaft 125 to pressurize the lower die 128B. The movement which consists of the upper mold | type 128A arrange | positioned in the possible position and comprised so that the steel plate 119 pressurized between the lower mold | types 128B can be stamped in a desired shape. It includes a rotary moving mold 128 as the mold, a.

Next, the operation of the stator core member manufacturing apparatus 110A configured as described above will be described.
FIG. 17 is a plan view for explaining the operation of the stator core member manufacturing apparatus according to Embodiment 5 of the present invention and the process of forming the split core member constituting the annular magnetic member.

In the fifth embodiment, the formation regions of the plurality of divided core members 103 for configuring the first and second annular magnetic members 102A and 102B are set so as to be arranged at a predetermined pitch in the circumferential direction. The stator core member manufacturing apparatus 110 </ b> A is obtained by punching the steel plate 119 so as to leave the formation regions of the plurality of divided core members 103 set on the steel plate 119 to obtain the divided core member 103. Composed. In FIG. 17, for convenience of explanation, the number of the divided core members 103 for constituting each of the first and second annular magnetic members 102 </ b> A and 102 </ b> B is illustrated as eight. As in the case of twelve.

First, when the upper base plate 117 is lowered by a drive source (not shown), as shown in FIG. 17, the pilot hole 131 is formed on the steel plate 119 at the position indicated by the arrow A in FIG. The formation of the circular punching 132 for arranging the rotor (not shown) at the position indicated by the arrow B, and the punching 133 for forming the respective contours of the divided yoke 104 and the divided teeth 105 at the position indicated by the arrow C are performed. , 134 are formed.

Further, at the positions indicated by arrows D and E, cuts 135 and 136 for forming the contours of the end faces of the divided yokes 104 of the first and second annular magnetic members 102A and 102B, respectively, At the position indicated by G, the concave and convex connecting portions 104a formed on the first and second annular magnetic members 102A and 102B, respectively, and the caulking 138 and 139 are respectively performed, and at the position indicated by the arrow I, The second mold 114A performs punching 140 for forming the contours of the divided core members constituting the first and second annular magnetic members 102A and 102B.
As described above, the first and second molds 112A and 114A have the predetermined protruding lengths of the divided teeth flange portions 105b and 105c of the divided core member 103 that constitutes the first and second annular magnetic members 102A and 102B. Punching processing other than punching for forming a contour other than the contour is performed.

It should be noted that any one of the punching processes at the positions of arrows D and E can be selectively performed. Similarly, any one of the caulking processes by pressing at the positions indicated by the arrows F and G can be selectively performed. That is, the part of the steel plate 119 punched at the position of arrow D is moved to arrow H without being stamped at arrow E, at the position of arrow F, and without being crimped at the position of arrow G. Can be made. Further, the steel sheet 119 is punched at the position of the arrow D without being punched at the position of the arrow D, and then is crimped at the position of the arrow G without being crimped at the position of the arrow F, until the arrow H. The steel plate 119 can be moved.

In addition, the caulking 138 and 139 form an uneven portion at a predetermined portion of the steel plate 119, similarly to the connecting portion 104a, and are arranged vertically when the first and second annular magnetic members 102A and 102B are stacked. The caulking 138 and 139 formed on the split core member 103 of the first and second annular magnetic members 102A and 102B to be fitted are fitted together.

Then, in synchronization with the operation of the first and second molds 112A and 114A, the servo motor 126 of the second press mechanism 111B is driven and the upper mold 128A is lowered via the crankshaft 125, whereby the arrow in FIG. At a position indicated by H, a cutout 141 is formed for forming a contour of a predetermined protruding length of the divided teeth flange portions 105b and 105c of the divided core member 103 constituting the first and second annular magnetic members 102A and 102B. .

At this time, the shape of the rotationally moving mold 128 for punching the steel plate 119 with a predetermined shape 41 will be described.
FIG. 18 illustrates the shape of a rotationally movable mold for punching out the divided teeth flange portion of the divided core member into the contour of a predetermined protruding length in the stator core member manufacturing apparatus according to Embodiment 5 of the present invention. It is a figure to do.
In addition, although the press work of the steel plate by the rotational moving die 128 is performed prior to the press work of the steel plate 119 by the second die 114A, in FIG. 18, the press work by the second die is performed for convenience of explanation. The shape of the subsequent first annular magnetic member 102A is illustrated.

In the rotary moving mold 128, the upper mold 128A is configured to punch out the divided teeth flanges 105b and 105c of the divided core member 103 with a predetermined protruding length and a tip end side with a predetermined outline. In the cross section orthogonal to the pressing direction of the steel plate 119 of the upper die 128A, the upper die 128A has a trapezoidal part 129a and a trapezoidal part 129a, each having the same width as the upper base of the trapezoidal part 129a, as shown in FIG. And a plurality of punched portions 129 each having a rectangular portion 129b extending on the opposite side. The plurality of punched portions 129 are the same number as the number of divided core members 103 constituting each of the annular magnetic members 102A and 102B to be formed at a predetermined interval in the circumferential direction around the axial center (rotating shaft) of the thrust bearing 121. Arranged. Further, the distance between the axial center of the thrust bearing 121 and the punched portion 129 corresponds to the distance between the axial center of the core member 101A of the stator to be manufactured and the divided tooth flange portions 105b and 105c.

The rotary moving mold 128 is configured to rotate in conjunction with the rotation of the rotary moving table 122 driven by the linear motor 124. That is, the punching portion 129 is rotated around the axial center of the thrust bearing 121 in conjunction with the driving of the linear motor 124. The rotational movement mold 128 is installed on the steel plate 119 so that the axial center of the thrust bearing 121 is orthogonal to each other, and the conveyance path of the steel plate 119 is formed by punching the formation area of the plurality of divided core members 103 by the rotational movement mold 128. The center of the region where the split core member 103 is formed intersects with the axial center of the thrust bearing 121 orthogonal to the steel plate 119 when moved to the position (indicated by the arrow H).

In addition, when the formation region of the plurality of divided core members 103 is moved to the position indicated by the arrow H, the lower bottom side of the trapezoidal portion 129a of each punched portion 129 is the punched 137 side when viewed from the punching direction by the upper die 128A. And the rectangular portion 129 b is disposed so as to be located inside the punching 132. At this time, a part of the rectangular portion 129 b on the trapezoidal portion 129 a side is arranged at a position that approaches a portion of the steel plate 119 that separates the punching 137 and the punching 132. Further, the shapes of the trapezoidal portion 129a and the rectangular portion 129b are set so that the interval La on the outer peripheral side of the adjacent divided teeth flange portions 105b and 105c formed after punching is larger than the interval Lb on the inner peripheral side.

Then, by punching the steel plate 119 with the rotary moving mold 128, the tips of the formation regions of the adjacent teeth ridges 105b and 105c formed adjacent to each other are separated, and the shapes of the distal sides of the divided teeth ridges 105b and 105c are formed. One of the annular magnetic members 102A whose width becomes narrower toward the tip is formed.

A thrust bearing 121 in which the rotary moving table 122 is arranged orthogonally to the steel plate 119 by driving the linear motor 124 in accordance with the increase or decrease in the protruding length of the divided tooth flanges 105b and 105c of the annular magnetic members 102A and 102B of the respective layers. Each time the respective annular magnetic members 102A and 102B are formed, by rotating each of the annular magnetic members 102A and 102B, the one side of the divided teeth base 105a from the tip of the divided teeth base 105a and The protruding lengths of the divided teeth flanges 105b and 105c to the other side are increased or decreased by the same length. Thereby, the other first annular magnetic member 102A and the second annular magnetic member 102B are manufactured.

Then, the first and second annular magnetic members 102A and 102B are fixed and integrated by the stacked caulking 138 and 139, and as shown in FIGS. 10 and 12, the gap between the adjacent divided tooth flanges 105b and 105c is obtained. The slot opening 107a is skewed with respect to the stacking direction of the first and second annular magnetic members 102A and 102B, and the tips of the divided teeth flange portions 105b and 105c are connected to the divided tooth base portion 105a. The stator core member 101A, which is narrower than the side portion, is completed.

According to the stator core member manufacturing apparatus 110A of the fifth embodiment, the rotational movement mold 128 is connected to the distal ends of the divided teeth flange portions 105b and 105c from the connecting portion of the divided teeth base portion 105a and the divided teeth flange portions 105b and 105c. The steel plate 119 has a shape that is punched so that the width becomes narrower toward the front.

More specifically, the formation positions in the steel plate 119 of the plurality of divided core members 103 constituting the first and second annular magnetic members 102A and 102B are set to be arranged at a predetermined pitch in the circumferential direction. The rotational movement mold 128 rotates the punched portion 129 for the steel plate 119 around an axis (rotation axis) orthogonal to the steel plate 119, and the center of the formation region of the plurality of divided core members 103 is the rotation axis. The steel plate 119 is installed so as to be punched out at a position where it intersects the heart. And the punching part 129 of the steel plate 119 in the rotationally moving mold 128 is such that the width becomes narrower from the connecting part of the divided tooth base part 105a and the divided tooth flange parts 105b and 105c toward the tip of the divided tooth flange parts 105b and 105c. The steel plate 119 has a shape for punching.

Each of the plurality of divided core members 103 manufactured by the stator core member manufacturing apparatus 110A can change the protruding length of the divided teeth flanges 105b and 105c from the divided teeth base portion 105a. is there.
Then, in the core member 101A of the stator configured by laminating the first and second annular magnetic members 102A and 102B each configured by annularly connecting the divided core members 103 so that the slot opening 107a is skewed. The widths of the divided teeth flange portions 105b and 105c become narrower from the connecting portion between the divided teeth base portion 105a and the divided teeth flange portions 105b and 105c toward the tips of the divided teeth flange portions 105b and 105c. Therefore, in the rotating electric machine having the stator core member 101A manufactured using the stator core member manufacturing apparatus 110A, both reduction of cogging torque and torque ripple and increase of torque can be realized.

Embodiment 6 FIG.
First, prior to the description of the stator core member manufacturing apparatus according to the sixth embodiment, in the stator core member manufacturing apparatus, a first die for forming the contours of the split yoke and the magnetic teeth. The shape of will be described.

FIG. 19 is a plan view of a stator core member manufactured using the stator core member manufacturing apparatus according to Embodiment 6 of the present invention, and FIG. 20 is a view of the stator core member according to Embodiment 6 of the present invention. It is a top view explaining the shape of the 1st metal mold | die of a manufacturing apparatus, and has shown a mode that the predetermined site | part of the steel plate is punched out.

In FIG. 19, in the divided teeth 105 of the stator core member 101 </ b> B, the connecting portion between the divided teeth base portion 105 a and the divided teeth flange portions 105 b and 105 c is wider than the intermediate portion between the divided teeth flange portions 105 b and 105 c. .
The other stator core member 101B has the same configuration as the stator core member 101A.

The stator core member manufacturing apparatus according to the sixth embodiment is configured in the same manner as the stator core member manufacturing apparatus 110A.
The stator core member 101B is manufactured in substantially the same manner as the stator core member 101A.

However, at the position indicated by the arrow C in FIG. 17, in the step of punching 134 for forming the contours of the divided yoke 104 and the divided teeth 105, the portion of the upper mold 113A that punches the steel plate 119 of the first mold 112A. The cross-sectional shape is set so that the connecting portion between the divided tooth base portion 105a and the divided tooth flange portions 105b and 105c is wider than the portion from the intermediate portion of the divided tooth flange portions 105b and 105c to the tip.
That is, as shown in FIG. 20, the cross-sectional shape of the portion of the upper mold 113A of the first mold 112A for punching the steel plate 119 is punched on the side close to the split tooth flanges 105b and 105c connected to the split tooth base 105a. The part is formed so as to become gradually narrower.

According to the stator core member manufacturing apparatus of the sixth embodiment, the first mold 112A for punching the steel plate 119 in the step of punching 133, 134 for forming the contours of the split yoke 104 and the split tooth 105 is provided. The cross-sectional shape of the portion of the upper mold 113A is such that the connecting portion of the divided teeth base portion 105a and the divided teeth flange portions 105b and 105c obtained after punching the steel plate 119 reaches the tip from the intermediate portion of the divided teeth flange portions 105b and 105c. It is formed to be wider than the part.
Thereby, the width | variety of the site | part of the division | segmentation tooth | gear 105 which goes to the front-end | tip of the division | segmentation teeth collar part 105b, 105c from the front end side of the division | segmentation teeth base part 105a becomes narrow.

That is, as in the fifth embodiment, the portion of the divided tooth 105 from the connecting portion of the divided tooth base portion 105a and the divided teeth flange portions 105b and 105c to the tip of the divided teeth flange portions 105b and 105c is divided into the divided teeth flange portions 105b and 105c. It can also be realized by using the first mold 112A so that the width becomes narrower toward the tip of the first mold 112A.
Therefore, in the rotating electric machine having the stator core member 101B manufactured by using the core member manufacturing apparatus of the sixth embodiment, both reduction of cogging torque and torque ripple and increase of torque can be realized.

In the sixth embodiment, it has been described that the rotary teeth 128 are formed so that the distal end sides of the divided teeth flange portions 105b and 105c are also narrowed toward the distal end, but the divided teeth flange portions 105b, The width of the front end side of 105c may be the same width.

Embodiment 7 FIG.
First, prior to the description of the stator core member manufacturing apparatus according to the seventh embodiment, the configuration of the stator core member manufactured using the stator core member manufacturing apparatus will be described.

FIG. 21 is a perspective view of a stator core member manufactured using the stator core member manufacturing apparatus according to the seventh embodiment of the present invention.

In FIG. 21, a stator core member 101 </ b> C manufactured using a stator core member manufacturing apparatus has the same configuration as that described in Japanese Patent No. 3933890, the connecting portion is omitted, and adjacent divided cores are included. The structure is the same as that of the core member 101A of the stator except that the end portions of the divided yoke 104 of the member 103 are integrally formed by connecting the end portions of the divided yoke 104 so that they can be refracted. Has been.

FIG. 22 is a side view of a stator core member manufacturing apparatus according to Embodiment 7 of the present invention, FIG. 23 is a plan view of a stator core member manufacturing apparatus according to Embodiment 7 of the present invention, and FIG. It is principal part sectional drawing of the 2nd press mechanism of the manufacturing apparatus of the core member of the stator which concerns on Embodiment 7 of invention.

22 and 23, the stator core member manufacturing apparatus 110B includes a third press mechanism 111C and a fourth press mechanism 111D as a moving mold mechanism.

The third press mechanism 111C includes an upper base plate 117 and a lower base plate 118, a transport mechanism (not shown) for transporting the steel plate 119 in a predetermined direction between the upper base plate 117 and the lower base plate 118, and a transport direction of the steel plate 119. A third mold 112B, which is arranged on the upstream side and is installed on the upper base plate 117 and the lower base plate 118 and made up of an upper mold 113C and a lower mold 113D, and a third mold 112B on the downstream side in the conveying direction of the steel plate 119 and a predetermined mold A fourth mold 114 </ b> B composed of an upper mold 115 </ b> C and a lower mold 115 </ b> D, which is disposed on the upper base plate 117 and the lower base plate 118, is disposed at intervals.

As shown in FIG. 24, the fourth press mechanism 111D includes a moving table 140 that is movably disposed on the lower base plate 118 so as to cross the conveying direction of the steel plate 119, and between the moving table 140 and the lower base plate 118. A linear motor 142 having a stator 141a and a movable element 141b fixed to be opposed to the lower base plate 118 side and the movable base 140 side, and a lower mold 144B and a crankshaft 125 arranged on the movable base 140. And a linear moving mold 143 as a moving mold composed of an upper mold 144A driven by a servo motor 126.

Next, the operation of the stator core member manufacturing apparatus 110B configured as described above will be described.
FIG. 25 is a plan view for explaining the operation of the stator core member manufacturing apparatus according to Embodiment 7 of the present invention and the process of forming the split core member constituting the annular magnetic member.

In the seventh embodiment, in the stator core member manufacturing apparatus 110B, the formation regions of the plurality of divided core members 103 for configuring the first and second annular magnetic members 102A and 102B are arranged in the width direction. A plurality of divided core members 103 are obtained by punching the steel plates 119 set to be arranged at predetermined intervals. The steel plate 119 is conveyed in a direction parallel to the longitudinal direction. In FIG. 25, for convenience of explanation, the number of the divided core members 103 for constituting each of the first and second annular magnetic members 102A and 102B is shown as six. As in the case of twelve.

Further, in the formation region of the plurality of divided core members 103 in the steel plate 119, the adjacent divided core members 103 serve as connecting portions where one ends or the other ends of the divided yokes 104 are connected to each other. When the divided core member 103 is obtained by punching the steel plate 119 with the member manufacturing apparatus 110B, the adjacent divided core members 103 are connected to bendable.

First, when the upper base plate 117 is lowered by a drive source (not shown), the pilot hole 152 is formed on the steel plate 119 at the position indicated by the arrow A in FIG. 25 by the third mold 112B, and the caulking 155 is provided at the position indicated by the arrow B. Further, V-shaped holes 156 for forming the outlines of the connecting portions of the adjacent divided core members 103 at the positions indicated by the arrows C are respectively formed, and the steel plates are formed at the positions indicated by the arrows E by the fourth mold 114B. Punching 158 for forming each contour of the split core member 103 continuous in the width direction of 119 is performed.

As described above, with the third and fourth molds 112B and 114B, the predetermined protruding lengths of the divided teeth flange portions 105b and 105c of the divided core member 103 constituting the first and second annular magnetic members 102A and 102B are obtained. A punching process for forming a contour other than the contour is performed.

Further, in synchronization with the operation of the third and fourth molds 112B and 114B, the servo motor 126 of the fourth press mechanism 111D is driven and the upper mold 144A is lowered via the crankshaft 125, whereby the arrow in FIG. In the position indicated by D, a through hole 159 is formed for forming a contour of a predetermined protruding length of the divided teeth flange portions 105b and 105c of the divided tooth 105 of the divided core member 103.

The shape of the linearly moving mold 143 for forming the punched hole 159 having a predetermined shape in the steel plate 119 will be described.
FIG. 26 is a plan view for explaining the shape of the linearly movable mold of the stator core member manufacturing apparatus according to Embodiment 7 of the present invention.
Note that the steel plate 119 is pressed by the linearly moving die 143 prior to the pressing of the steel plate by the fourth die 114B, but in FIG. 26, the punching by the fourth die 114B is performed for convenience of explanation. The shape of the steel plate 119 is shown.

In FIG. 26, the upper molds 144A for cutting out the divided teeth flange portions 105b and 105c of the divided core member 103 into the contours of a predetermined protruding length are the upper bottom sides of the first and second trapezoidal portions 145a and 145b, respectively. Have a plurality of punched portions 145 that are connected to each other. The plurality of punched portions 145 are arranged in a predetermined linear direction.

When the steel plate 119 is conveyed to a position (indicated by an arrow X) where the steel plate 119 is punched by the linear moving mold 143, the linearly moving mold 143 configured as described above is arranged so that the arrangement direction of the punched portions 145 changes to each annular magnetism. The plurality of divided core members 103 for constituting the members 102A and 102B are installed so as to coincide with the arrangement direction of the formation regions. Further, the linear moving mold 143 is configured to be moved in the arrangement direction of the formation regions of the plurality of divided core members 103 in conjunction with the driving of the linear motor 142. That is, the punching portion 145 is moved in the arrangement direction of the formation regions of the plurality of divided core members 103 in conjunction with the driving of the linear motor 142.

The upper die 144A is arranged so that the connecting portion of the first and second trapezoidal portions 145a and 145b of each punched portion 145 can punch the portion of the steel plate 119 including the space between the adjacent divided tooth flange portions 105b and 105c. Has been. At this time, the lower bottom side of one trapezoidal portion 145a is disposed on the outer peripheral side of the divided teeth flange portions 105b and 105c from the region where the divided teeth flange portions 105b and 105c are formed, and the lower bottom side of the other trapezoidal portion 145b is the divided teeth flange portion 145b. It arrange | positions from the formation area of 105b, 105c to the inner peripheral side.

The shapes of the first and second trapezoidal portions 145a and 145b are set so that the outer peripheral side interval Lc of the divided teeth flanges 105b and 105c is larger than the inner peripheral side interval Ld. As described above, in the divided core member 103 formed by punching the steel plate 119 with the linear moving mold 143, the distal ends of the divided teeth flange portions 105b and 105c have a shape that gradually becomes narrower toward the distal end.

Then, by pressing the steel plate 119 with the linearly moving mold 143, as shown at the position of the arrow F in FIG. 25, the tip shapes of the split teeth flange portions 105b and 105c become a narrow shape toward the tip. A split core member 103 having teeth ridges 105b and 105c is formed.

When the movable base 140 forms the divided core members 103 of the first and second annular magnetic members 102A and 102B arranged in the respective layers, the divided core of the first and second annular magnetic members 102A and 102B of the respective layers is formed. The distal end side of the divided teeth base portion 105a of the divided core member 103 is moved in the arrangement direction of the formation region of the divided core member 103 in accordance with the increase and decrease of the protruding length of the divided teeth flange portions 105b and 105c of the member 103. The protruding lengths of the split tooth flanges 105b and 105c from one side to the other side of the split tooth base 105a are increased or decreased by the same length.

The plurality of divided core members 103 obtained in the connected state are formed into the first annular magnetic member 102B or the second annular magnetic member 102B by bending the connecting portion into an annular shape.
The first and second annular magnetic members 102A and 102B are laminated and fixedly integrated by the crimping caulking 33, and as shown in FIG. 12, the gaps are formed between the adjacent divided tooth flange portions 105b and 105c. The slot opening 107a is skewed with respect to the stacking direction of the first and second annular magnetic members 102A and 102B, and the tip ends of the divided teeth flange portions 105b and 105c are wider than the portion on the connection portion side with the divided tooth base portion 105a. A narrow core member 101C of the stator is completed.

According to the stator core member manufacturing apparatus 110B of the seventh embodiment, the linearly moving mold 143 is connected to the distal ends of the divided teeth flange portions 105b and 105c from the connecting portion of the divided tooth base portion 105a and the divided teeth flange portions 105b and 105c. The steel plate 119 has a shape that is punched so that the width becomes narrower toward the front.
More specifically, regions in the steel plate 119 for forming the plurality of divided core members 103 constituting the first and second annular magnetic members 102A and 102B are arranged at predetermined intervals in a predetermined linear direction, The moving mold 143 is installed so that the steel plate 119 can be punched by moving the punching portion 145 for the steel plate 119 in a predetermined linear direction.

Accordingly, each of the plurality of divided core members 103 manufactured by the stator core member manufacturing apparatus 110B can change the protruding lengths of the divided teeth flange portions 105b and 105c from the divided teeth base portion 105a. . In the stator core member 101A, which is formed by laminating the first and second annular magnetic members 102A and 102B each formed by annularly connecting the divided core members 103 so that the slot opening 107a is skewed. The width becomes narrower from the connecting portion between the divided tooth base portion 105a and the divided tooth flange portions 105b and 105c toward the tips of the divided tooth flange portions 105b and 105c. Therefore, the rotating electrical machine having the stator core member 101C manufactured using the core member manufacturing apparatus 110B can realize both reduction of cogging torque and torque ripple, and increase of torque.

Embodiment 8 FIG.
The stator core member manufactured using the stator core member manufacturing apparatus according to the eighth embodiment is the same as that of the fifth embodiment.

Next, the configuration of the first mold of the stator core member manufacturing apparatus will be described.
FIG. 27 is a plan view for explaining the shapes of the first die and the rotationally movable die of the stator core member manufacturing apparatus according to the eighth embodiment of the present invention. Shows a state of punching a predetermined portion of the steel plate.

As shown in FIG. 27, the end of the divided yoke 104 of the adjacent divided core member 103 in the formation area of the plurality of divided core members 103 for constituting each of the first and second annular magnetic members 102A and 102B. The parts are separated.
Then, the shape of the upper mold 113C of the third mold 112B for punching the steel plate 119 at the arrow C in FIG. 25 is as shown in FIG. 27 in the formation scheduled region of the adjacent split core member 103 of the steel plate 119. The end portions of the divided yoke 104 are set to be separated.

Although not shown in detail, a caulking process for forming the connecting portion 104a at a place where the steel plate 119 is disposed at a predetermined position is also performed by pressing with the third mold 112B.

Thereafter, punching is performed by the linearly moving mold 143 to form the contours of the predetermined protruding lengths of the divided tooth flanges 105b and 105c, and the first and second annular magnetic members 102A and 102B are divided. The core member 103 is obtained.
Hereinafter, similarly to the fifth embodiment, the split core member 103 is annularly arranged to be the first and second annular magnetic members 102A and 102B, and the first and second annular magnetic members 102A and 102B are similar to the fifth embodiment. By stacking, the core member 101A of the stator can be obtained.

According to the stator core member manufacturing apparatus of the eighth embodiment, as in the seventh embodiment, the divided core member 103 is separated from the connecting portion of the divided teeth base portion 105a and the divided teeth flange portions 105b and 105c. The rotating electric machine having the stator core member 101A manufactured using the stator core member manufacturing apparatus 110B can reduce cogging torque, torque ripple, and torque. Both increases can be realized.

Embodiment 9 FIG.
First, prior to the description of the stator core member manufacturing apparatus according to the ninth embodiment, the configuration of the stator core member manufactured using the stator core member manufacturing apparatus will be described.
FIG. 28 is a plan view of a stator core member manufactured by the stator core member manufacturing apparatus according to Embodiment 9 of the present invention.

In FIG. 28, the core member 101D of the stator has substantially the same configuration as the core member 101A of the stator. For example, in the split core member 103 constituting the first annular magnetic member arranged at the end in the stacking direction, A portion of one side or the other side in the width direction on the distal end side of the divided tooth base portion 105a is deleted, and the protrusions of the divided tooth flange portions 105b and 105c are omitted on the side where the divided tooth base portion 105a is cut.

In the core member 101D of the stator, one end of the slot opening 107a in the extending direction is one divided tooth base portion 105a among the adjacent divided tooth base portions 105a of the first annular magnetic member 102A constituting one end side in the stacking direction. The other end of the divided tooth base portion 105a adjacent to the first or second annular magnetic member 102A, 102B constituting one end side in the stacking direction is opened at the other end of the slot opening 107a. An opening is made so as to enter the teeth base 105a.

Next, an apparatus for manufacturing the core member of the stator will be described.
FIG. 29 is a view for explaining the shape of the rotationally moving mold of the stator core member manufacturing apparatus according to Embodiment 9 of the present invention.

The stator core member manufacturing apparatus of this embodiment is configured in the same manner as the stator core member manufacturing apparatus 110B.
However, among the formation regions of the plurality of divided core members 103 set on the steel plate 119, the rotary moving mold 128 that performs punching processing to form the contour of the predetermined protruding length of the divided teeth flange portions 105b and 105c is provided. As shown in FIG. 29, the punched portion 129 of the upper mold 128A that is configured can move to a circumferential position corresponding to the circumferential position at the proximal end of the divided tooth base 105a to punch the steel plate 119. It is configured to be possible.

According to the stator core member manufacturing apparatus of the ninth embodiment, for example, one end of the slot opening 107a is inserted into one of the adjacent divided tooth bases 105a, and the other end of the slot opening 107a is connected to the adjacent divided tooth. The stator core member 101D can be manufactured so as to enter the other of the base portions 105a.
Accordingly, the slot opening 107a can be greatly skewed with respect to the stacking direction of the first and second annular magnetic members 102A and 102B, and the cogging torque and torque ripple reducing effect and the torque increasing effect can be further increased. Obtainable.

In each of the above fifth to ninth embodiments, the shapes of the punched portions 129 and 145 of the upper molds 128A and 144A for performing the punching process for forming the contours of the predetermined protruding lengths of the divided teeth flange portions 105b and 105c are as follows. The trapezoidal portion 129a and the rectangular portion 129b or the first and second trapezoidal portions 145a and 145b have been described as being combined, but the shape of the punched portions 129 and 145 is not limited to this. The shape of the punched portions 129 and 145 only needs to have a shape in which the steel plate 119 is punched so that the distal end side is narrower than the proximal end portion side of the teeth flange portion 5b.

In each of the fifth to ninth embodiments, the linear motor 124 or the linear motor 142 is used as a drive source for moving the rotational movement mold 128 or the linear movement mold 143. However, the rotational movement mold 128 is used. Alternatively, another drive source may be used as a drive source for moving the linear moving mold 143.

1A to 1C motor (rotary electric machine), 2, rotor, 5 stator, 6A to 6C stator core, 7 yoke, 8 teeth, 8a teeth base, 8b to 8e teeth collar, 10 slots, 101A to 101D stator core members (stator core) , 102A, 102B, annular magnetic member, 103 divided core member, 104 divided yoke, 105 divided tooth, 105a divided tooth base, 105b, 105c divided tooth collar, 10A, 10B stator core member manufacturing apparatus, 112A, 112B mold 114A, 114B mold, 119 steel plate, 128 rotary moving mold (moving mold), 129 punching part, 143 linear moving mold (moving mold), 145 punching part.

Claims (10)

1. A rotor and a stator having a stator core disposed coaxially with the rotor so as to surround the rotor;
   The stator core includes a yoke disposed coaxially with the rotor, a teeth base projecting between both ends of the yoke in the axial direction, and a teeth flange projecting on both sides from the tip of the teeth base. A rotating electrical machine comprising a plurality of teeth arranged in the circumferential direction of the yoke and spaced apart from each other, the slot opening formed between the adjacent teeth being skewed with respect to the axial direction of the yoke Because
   A rotating electric machine characterized in that a width of the teeth brim portion is narrowed from a connecting portion with the teeth base toward a tip.
2. 2. The rotating electrical machine according to claim 1, wherein a portion of the teeth end portion on the base end side is formed so as to increase in width toward a connecting portion with the teeth base portion.
3. 3. The rotating electrical machine according to claim 1, wherein the opening of the slot enters the teeth base at a predetermined portion in the axial direction of the yoke.
4. The number of poles of the rotor is 10Z (where Z is a natural number), the number of slots is 12Z, and the angle of the opening of the slot with respect to the axial direction of the yoke is (3k / Z) (where k is The rotating electrical machine according to any one of claims 1 to 3, wherein the rotating electrical machine is any one of 1, 2, and 3.
5. A plurality of annular magnetic members, each of which is formed by processing a steel plate and annularly connecting a plurality of plate-like divided core members, wherein the divided core members are arranged along a connecting direction; A split tooth base that protrudes from an intermediate portion in the connecting direction and a split tooth that has a split tooth flange protruding from the tip of the split tooth base, and a gap between adjacent split teeth flanges is continuous. A stator core manufacturing apparatus for manufacturing a stator core configured by laminating a plurality of the annular magnetic members as described above,
   Other than the contour of the predetermined protruding length of the divided teeth collar portion of the divided core member of the divided core member, which is arranged corresponding to the conveyance path of the steel plate conveyed in a predetermined direction and constitutes the annular magnetic member with respect to the steel plate. A mold that performs punching to form a contour, and a moving mold that performs punching to form a contour of a predetermined protruding length of the divided teeth flange portion for the steel plate,
   The at least one of the mold and the moving mold is arranged so that the width of the divided tooth heel portion becomes narrower from the connecting portion of the divided tooth base portion and the divided tooth heel portion toward the tip of the divided tooth heel portion. A stator core manufacturing apparatus having a shape for punching a steel plate.
6. 6. The stator core according to claim 5, wherein the movable mold has a shape in which the steel sheet is punched so that a width of a tip side of the divided teeth flange portion is narrower than a side of the divided teeth base portion. Manufacturing equipment.
7. The mold has a shape in which the steel sheet is punched so that the width of the connecting portion between the divided tooth base and the divided tooth flange is wider than the width of the distal end side of the divided teeth flange. The stator core manufacturing apparatus according to claim 5 or 6.
8. The formation region in the steel plate of the plurality of divided core members constituting each annular magnetic member is set to be arranged at a predetermined pitch in the circumferential direction,
   The moving mold rotates a punched portion with respect to the steel plate around an axis perpendicular to the steel plate, and punches the steel plate at a position where the centers of the plurality of divided core members intersect with the axis. The stator core manufacturing apparatus according to any one of claims 5 to 7, wherein the stator core manufacturing apparatus is installed.
9. The formation regions in the steel plates of the plurality of divided core members constituting each annular magnetic member are arranged at predetermined intervals in a predetermined linear direction,
   8. The moving mold according to claim 5, wherein the moving mold is installed so that a punched portion for the steel plate can be moved in the predetermined linear direction to punch the steel plate. The stator core manufacturing apparatus according to Item.
10. The moving mold can move to a position where it enters the distal end side of the divided teeth base in a formation region of the plurality of divided core members constituting each annular magnetic member in the steel plate, and can punch the steel plate The stator core manufacturing apparatus according to claim 8 or 9, wherein the stator core manufacturing apparatus is configured as described above.

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