JP2016082769A - Armature and electrical rotating machine using the armature - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an armature having an iron core constituted of an inner iron core and an outer iron core, in which the inner iron core can be attached to the outer iron core with a small pressure force, capable of improving the productivity and reducing the manufacturing cost.SOLUTION: An outer iron core 50 has plural connection grooves 51 which are formed on the inner peripheral surface for inserting teeth 43 of an inner iron core 40. On a connection groove bottom face 51a, a protrusion 51b protruding inward in a radial direction is formed. The protrusion 51b and a tooth outer periphery face 43a are in contact with each other. The tooth outer periphery face 43a and the connection groove bottom face 51a are interposed by a gap 30a.SELECTED DRAWING: Figure 6

Description

  The present invention relates to an armature of a rotating electric machine, and more particularly to an armature in which an iron core is composed of an inner iron core and an outer iron core, and a rotating electric machine using the armature.

In recent years, rotating electric machines such as electric motors and generators have been required to have a small size and high output, and it has been desired to improve the space factor of the coils provided in the armature that is a stator. Moreover, productivity improvement of a rotary electric machine is calculated | required and improvement of the mounting property of the coil to the iron core of an armature is also requested | required.
As an armature that can efficiently mount a coil with a high space factor, there is one using a split iron core composed of an inner iron core and an outer iron core.

  As an electric motor using a split iron core for an armature that is a stator, the split iron core is an inner core provided with a plurality of magnetic pole teeth (teeth) that are connected via an annular connecting portion and extend radially outward. A magnetic core and a yoke core that is an outer iron core that is arranged so as to surround the outer side of the magnetic pole part core, and is provided with a plurality of fitting grooves that are fitted to the outer peripheral side of each magnetic pole tooth on the inner peripheral part; (For example, refer patent document 1).

JP-A-11-55879 (2nd page, 4th page, Fig. 1-3, Fig. 8-9)

In the armature of the electric motor described in Patent Document 1, the outer peripheral side between the magnetic pole teeth in the magnetic pole portion iron core is open, and a high space factor coil can be efficiently mounted on the armature iron core.
That is, the armature of the electric motor described in Patent Document 1 is formed by press-fitting the outer peripheral side portion of each magnetic pole tooth in the magnetic pole portion iron core to which the coil is attached into the fitting groove of the yoke iron core. However, since the concentrated winding coil having a small number of poles and a relatively small number of magnetic pole teeth is used, it is possible to attach the magnetic pole part core to the yoke iron core with a small pressing force.

However, the structure of the armature described in Patent Document 1 has a large number of teeth in at least one of the case of multipoles and the case of using distributed winding coils, so that the inner iron core is attached to the outer iron core. There is a problem that the required pressing force increases, a large press is required, and the mounting time increases.
Further, when an excessive pressure is required, there is a problem that at least one of the inner iron core and the outer iron core is deformed, and an armature as a stator cannot be manufactured.

  The present invention has been made to solve the above-described problems, and the object thereof is not to increase the pressing force for mounting the inner iron core to the outer iron core even when the number of teeth is large. It is to obtain an armature that does not require a large press, can reduce manufacturing costs, shortens manufacturing time, improves productivity, and is easy to manufacture, and a rotating electric machine using the armature.

  An armature according to the present invention includes an iron core and a coil attached to the iron core, and the iron core includes an inner iron core having a tooth portion, and an outer iron core that is coupled to the tooth portion on the inner peripheral side to form a back yoke portion. In the inner iron core, the teeth portion is provided radially from the annular portion of the inner iron core toward the radially outer side, and the annular portion is formed in the radial direction of the teeth portion. The thin portion protruding in the circumferential direction from the inner portion is connected to the thin portion of the adjacent tooth portion, and the outer iron core has the radially outer portion of the tooth portion inserted into the inner peripheral surface. A connection groove is provided, and the iron core has a portion where the tooth portion and the connection groove are partially in contact with each other in the radial direction, and a gap is formed between the radial outer peripheral surface of the tooth portion and the bottom surface of the connection groove. It is what has become.

  In the armature according to the present invention, the iron core has a portion where the tooth portion and the connection groove are in partial contact with each other in the radial direction, and there is a gap between the radial outer peripheral surface of the tooth portion and the bottom surface of the connection groove. Therefore, the productivity is excellent and the manufacturing cost can be reduced.

It is a perspective schematic diagram of the armature concerning Embodiment 1 of this invention. It is a perspective schematic diagram of the inner iron core in the armature according to the first embodiment of the present invention. It is a perspective schematic diagram of the outer side iron core in the armature concerning Embodiment 1 of the present invention. It is the partial plane schematic diagram which looked at the outer side iron core shown in FIG. 3 from the axial direction. It is a perspective schematic diagram explaining the process of producing the armature concerning Embodiment 1 of this invention. It is a partial schematic diagram of the AA cross section of the armature shown in FIG. It is a partial front schematic diagram explaining the coupling | bonding state of the inner iron core and an outer iron core of the armature concerning Embodiment 2 of this invention. It is a partial front schematic diagram explaining the coupling | bonding state of the inner side iron core and an outer side iron core of the armature concerning Embodiment 3 of this invention. It is a partial front schematic diagram explaining the coupling | bonding state of the inner side iron core and an outer side iron core of the armature concerning Embodiment 4 of this invention. It is a partial front schematic diagram explaining the coupling | bonding state of the inner side iron core and an outer side iron core of the armature concerning Embodiment 5 of this invention. It is a partial front schematic diagram explaining the coupling | bonding state of the inner side iron core and an outer side iron core of the armature concerning Embodiment 6 of this invention. It is a perspective schematic diagram of the outer side iron core in the armature concerning Embodiment 7 of this invention. It is the partial plane schematic diagram which looked at the outer side iron core shown in FIG. 12 from the axial direction. It is a partial front schematic diagram explaining the coupling | bonding state of the inner side iron core and an outer side iron core of the armature concerning Embodiment 7 of this invention. FIG. 15 is an enlarged schematic view of a region F showing a portion where the outer peripheral surface of the teeth portion of the inner iron core in FIG. 14 is in contact with the tip of the protrusion formed in the connection groove of the outer iron core. It is a perspective schematic diagram of the outer side iron core in the armature concerning Embodiment 8 of this invention. It is a partial front schematic diagram of the 1st outside core piece (a) and the 2nd outside core piece (b) which constitute the outside iron core in the armature concerning Embodiment 8 of the present invention. It is a partial front schematic diagram explaining the coupling | bonding state of the inner side iron core and an outer side iron core of the armature concerning Embodiment 8 of this invention. It is a side surface cross-section schematic diagram of the rotary electric machine concerning Embodiment 9 of this invention.

Hereinafter, an armature and a rotating electrical machine according to the present invention will be described with reference to the drawings.
Unless otherwise specified, each of the circumferential direction, the radial direction, and the axial direction in the present invention indicates the circumferential direction, the radial direction, and the axial direction in the armature or the rotating electrical machine.

Embodiment 1 FIG.
FIG. 1 is a schematic perspective view of an armature according to Embodiment 1 of the present invention.
As shown in FIG. 1, an armature 10 that is a stator according to the present embodiment includes an iron core 30, a coil 20 attached to the iron core 30, and a slot cell 25 that electrically insulates the coil 20 and the iron core 30. And.
The iron core 30 is composed of an inner iron core 40 and an outer iron core 50. The coil 20 is a distributed winding coil that is mounted in two slots of the iron core 30 across a plurality of teeth 43.

FIG. 2 is a schematic perspective view of the inner iron core in the armature according to the first embodiment of the present invention.
As shown in FIG. 2, the inner iron core 40 includes a plurality of caulking portions 44 provided in the teeth portion 43 constituting the magnetic poles by laminating inner iron core pieces formed of magnetic steel plates in the axial direction. It is formed by connecting in the axial direction.
A thin-walled portion 45 protruding in the circumferential direction is provided at the distal end portion on the radially inner side of the teeth portion 43, and a radially outer portion of the teeth portion 43 (denoted as a radially outer portion of the teeth portion) It is a portion connected to the outer iron core 50.

Further, the inner iron core 40 has an annular portion formed by connecting the thin portion 45 of the tooth portion with the thin portion 45 of the adjacent tooth portion.
Moreover, the thin parts 45 which oppose are joined partially, and the clearance gap is formed in parts other than this joined part 45a. The ratio of the joint portion 45a of the thin portion 45 is smaller than the proportion of the gap portion 45b that is a portion where the thin portion 45 is not joined.
Moreover, the teeth part 43 is provided radially from the annular portion of the inner iron core 40 toward the radially outer side. A slot 46 is formed between adjacent teeth portions 43.

FIG. 3 is a schematic perspective view of the outer iron core in the armature according to the first embodiment of the present invention.
As shown in FIG. 3, the outer iron core 50 is formed by laminating outer iron core pieces formed of magnetic steel plates in the axial direction, and magnetically connects the teeth portions 43 of the inner iron core 40. It is a back yoke part.
Further, on the inner peripheral surface of the outer iron core 50, a connecting groove 51 that is connected to the inner iron core 40 is provided by inserting a radially outer portion of the teeth portion of the inner iron core 40. The connection groove 51 extends from one end surface 50 a in the axial direction to the other end surface 50 b in the outer iron core 50.

FIG. 4 is a schematic partial plan view of the outer iron core shown in FIG. 3 viewed from the axial direction.
As shown in FIGS. 3 and 4, the connecting groove 51 is provided with a protruding portion (referred to as a connecting groove protruding portion) 51 b that protrudes in the radial direction on a bottom surface (referred to as a connecting groove bottom surface) 51 a. And the connection groove protrusion part 51b is provided over the whole area of the axial direction of the connection groove bottom face 51a.
As shown in FIG. 4, the connection groove 51 is a dovetail whose opening is narrower than the bottom. A line passing through a circumferential side surface of the connection groove 51 (referred to as a connection groove side surface) 51c, a central axis of the armature 10 and an intermediate point of the circumferential width of the tooth portion 43 inserted into the connection groove 51. The angle θ1 formed with L1 is an acute angle.

FIG. 5 is a schematic perspective view illustrating a process for manufacturing the armature according to the first embodiment of the present invention.
In FIG. 5, the inner iron core 40 in which the coil 20 is mounted in the slot 46 in which the slot cell 25 is installed is moved relatively from the axial direction toward the inner circumferential side space of the outer iron core 50. Indicates the state.
From the state of FIG. 5, the inner iron core 40 is further moved in the direction of the outer iron core 50, and the teeth portion radial outer portion of the inner iron core 40 is inserted into the connection groove 51 of the outer iron core 50. 1 is produced.

6 is a partial schematic view of the AA cross section of the armature shown in FIG.
As shown in FIG. 6, the armature 10 formed by mounting the inner iron core 40 provided with the coil 20 on the outer iron core 50 of the present embodiment is a surface in the radial direction of the connecting groove protruding portion 51b ( 2 is in contact with a radially outer peripheral surface (referred to as a tooth portion outer peripheral surface) 43a of the tooth portion 43 shown in FIG. 2, and the connection groove side surface 51c is a peripheral side surface of the tooth portion 43. It is in contact with 43b (referred to as the side surface of the tooth portion).
That is, in the armature 10 of the present embodiment, the tooth portion outer peripheral surface 43a of the inner iron core 40 and the connection groove protrusion surface of the outer iron core 50 are magnetically connected, and the tooth portion side surface 43b of the inner iron core 40 The connection groove side surface 51c of the outer iron core 50 is magnetically connected.

Further, in the armature 10 of the present embodiment, as shown in FIG. 6, a gap 30 a is formed between the teeth portion outer peripheral surface 43 a of the inner iron core 40 and the connection groove bottom surface 51 a of the outer iron core 50.
The width of the gap 30a in the radial direction is increased in FIG. 6 for easy understanding, but is about 10 μm to 30 μm.
This value is determined from the lower limit of the manufacturing tolerance of the mold used to produce the inner core piece and the outer core piece.

In the armature 10 of the present embodiment, in the step of inserting the inner iron core 40 into the outer iron core 50 at the time of assembling the armature, a part of the outer peripheral surface 43a of the teeth portion of the inner iron core 40 is the surface of the connecting groove protruding portion of the outer iron core 50. Therefore, even if the number of teeth is large, the frictional force between the outer iron core and the inner iron core can be reduced, the assembly is easy, and the productivity is excellent.
In addition, the pressure applied when inserting the inner iron core into the outer iron core can be reduced, eliminating the need for large presses and reducing manufacturing costs, as well as preventing the inability to manufacture the armature due to deformation of the iron core. it can.

In the armature 10, a connection groove protruding portion 51 b is provided in the connection groove 51 of the outer iron core 50, and a gap 30 a is formed between the teeth outer peripheral surface 43 a of the inner iron core 40 and the connection groove bottom surface 51 a of the outer iron core 50. However, no protrusion is provided on the bottom surface of the connection groove, and a protrusion is provided on the outer peripheral surface of the tooth portion. By contacting the protrusion and the bottom surface of the connection groove, the outer peripheral surface of the tooth portion and the bottom surface of the connection groove are provided. A gap may be formed between them.
That is, in the armature of the present embodiment, the iron core has a portion in which the tooth portion of the inner iron core and the connection groove of the outer iron core are partially in contact in the radial direction, and the diameter of the tooth portion of the inner iron core. A gap is formed between the outer peripheral surface in the direction and the connection groove bottom surface of the outer iron core.

Although the coil 20 of the armature 10 of the present embodiment is a distributed winding coil, the coil may be a concentrated winding coil. The same effect can be obtained even when the armature uses a concentrated winding coil and has a large number of magnetic poles and a large number of teeth.
In addition, the inner iron core 40 is partially joined to the tooth portions 43 adjacent to each tooth portion 43 by the thin portion 45, but all the thin portions 45 may be joined.

Even if the adjacent teeth portions 43 are joined by all the thin portions 45, since the joined portions are thin, the magnetic connection between the adjacent teeth portions is not large.
In the armature 10 of the present embodiment, there is a portion where the thin portion 45 of each tooth portion 43 is not joined to the thin portion 45 of the adjacent tooth portion 43, and the magnetic connection between the adjacent tooth portions can be reduced. The effect of reducing the leakage flux of the armature is great, and the torque of the rotating electrical machine is improved.

Embodiment 2. FIG.
FIG. 7 is a partial schematic front view for explaining a coupling state between the inner iron core and the outer iron core of the armature according to the second embodiment of the present invention.
As shown in FIG. 7, the armature of the present embodiment is the same as the armature 10 of the first embodiment except that the structure of the connection groove 251 of the outer iron core 250 is different.
In the connection groove 251 of the present embodiment, the connection groove bottom surface 251a protrudes inward in the radial direction and has an arc shape in the circumferential direction.
In the armature of the present embodiment, the intermediate portion in the circumferential direction of the arc-shaped connection groove bottom surface 251a is in contact with the teeth portion outer peripheral surface 43a, both side portions in the circumferential direction of the connection groove bottom surface 251a, and the teeth portion outer peripheral surface 43a. Since the gap 230a is formed between them, the same effect as the armature of the first embodiment is obtained.

In the present embodiment, the connecting groove bottom surface 251a of the outer iron core 250 has an arc shape, but the radially outer peripheral surface of the teeth portion of the inner iron core protrudes outward in the radial direction, and has an arc shape in the circumferential direction. Therefore, it is not necessary to provide a protruding portion in the connection groove of the outer iron core. Even in this configuration, the intermediate part of the outer peripheral surface of the arc-shaped tooth portion is in contact with the bottom surface of the connection groove, so that the same effect can be obtained.
That is, in the armature of the present embodiment, the iron core has a portion in which the tooth portion of the inner iron core and the connection groove of the outer iron core are partially in contact in the radial direction, and the diameter of the tooth portion of the inner iron core. A gap is formed between the outer peripheral surface in the direction and the connection groove bottom surface of the outer iron core.
In particular, the armature according to the present embodiment has a great effect of reducing the pressing force when the inner iron core is inserted into the outer iron core because the contact between the bottom surface of the connection groove and the outer peripheral surface of the tooth portion is a line contact.

Embodiment 3 FIG.
FIG. 8 is a partial schematic front view for explaining a coupling state between the inner iron core and the outer iron core of the armature according to the third embodiment of the present invention.
As shown in FIG. 8, in the armature of the present embodiment, a groove (referred to as a fitting groove) 343 c that fits with the connection groove protrusion 351 b of the outer iron core 350 is a tooth portion in the tooth portion 343 of the inner iron core 340. Except for being provided on the outer peripheral surface 343a, it is the same as the armature 10 of the first embodiment.
In the present embodiment, the connection groove protruding portion 351b has a partial columnar shape, and the axial opening of the fitting groove 343c has an arc shape. However, the present invention is not limited to this. Here, the partial cylinder is formed by dividing the cylinder by a plane parallel to the center axis of the circle.

As shown in FIG. 8, in the armature of the present embodiment, the height in the radial direction of the connecting groove protruding portion 351b is larger than the depth in the radial direction of the fitting groove 343c, and the tooth portion outer peripheral surface 343a Since the gap 330a is formed between the connection groove bottom surface 351a, the same effect as the armature of the first embodiment is obtained.
Since the connecting groove protrusion 351b of the outer iron core 350 is in contact with the fitting groove 343c of the inner iron core 340, the positional accuracy of the inner iron core 340 is improved.

In the present embodiment, the connection groove 351 is provided with the connection groove protrusion 351b, and the teeth outer peripheral surface 343a is provided with the fitting groove 343c. However, the protrusion is provided on the outer peripheral surface of the tooth and is fitted to the bottom of the connection groove. A groove may be provided, and the radial height of the protrusion may be larger than the radial depth of the fitting groove. Even in this configuration, the protrusion on the outer peripheral surface of the tooth portion is in contact with the fitting groove on the bottom surface of the connection groove, so that the same effect can be obtained.
That is, in the armature of the present embodiment, the iron core has a portion in which the tooth portion of the inner iron core and the connection groove of the outer iron core are partially in contact in the radial direction, and the diameter of the tooth portion of the inner iron core. A gap is formed between the outer peripheral surface in the direction and the connection groove bottom surface of the outer iron core.

Embodiment 4 FIG.
FIG. 9 is a partial schematic front view for explaining a coupling state between the inner iron core and the outer iron core of the armature according to the fourth embodiment of the present invention.
As shown in FIG. 9, the armature of the present embodiment is the same as the armature 10 of the first embodiment except that two connection groove protrusions 451 b are provided on the connection groove bottom surface 451 a of the outer iron core 450. It is.

In the present embodiment, two connection groove protrusions 451 b are provided on the connection groove bottom surface 451 a of the outer iron core 450. And three gaps 430a are formed between the teeth portion outer peripheral surface 43a and the connection groove bottom surface 451a.
Further, the two connecting groove protrusions 451b may be installed by integrating the outer circumferential portions of the connecting grooves with the connecting groove side surface 451c so that the gap 430a is one.
Further, the number of connecting groove protrusions 451b may be n, and the number of gaps 430a may be (n + 1). Increasing the number of connection groove protrusions 451b increases the frictional force when inserting the inner iron core into the outer iron core 450. Therefore, when the number n of connection groove protrusions 451b is 2 or more, a frictional force that deforms the iron core is generated. It is better if it is less than the number to be made.

In the armature according to the present embodiment, a part of the teeth outer peripheral surface 43a of the inner iron core 40 is in contact with the connection groove projecting portion surface of the outer iron core 450, and a gap 430a is formed between the teeth outer peripheral surface 43a and the connection groove bottom surface 451a. Therefore, it has the same effect as the armature of the first embodiment.
In addition, there is a plurality of connection groove protrusions 451b of the outer iron core 450 that are in contact with the teeth outer peripheral surface 43a of the inner iron core 40, and one connection groove having a surface having an area equal to the total area of the surfaces of the plurality of connection groove protrusions. Compared with the outer iron core provided with the protrusions, the portions to which the pressing force is applied during assembly can be dispersed, so that deformation of the inner iron core 40 and the outer iron core 450 can be suppressed.

In the present embodiment, the connection groove 451 is provided with a plurality of connection groove protrusions 451b, but the connection groove 451 is not provided with the connection groove protrusions 451b, and a plurality of protrusions are provided on the outer peripheral surface of the teeth portion of the inner iron core. May be. Even in this configuration, the plurality of projecting portions on the outer peripheral surface of the tooth portion are in contact with the bottom surface of the connection groove of the outer iron core, so that the same effect is achieved.
That is, in the armature of the present embodiment, the iron core has a portion in which the tooth portion of the inner iron core and the connection groove of the outer iron core are partially in contact in the radial direction, and the diameter of the tooth portion of the inner iron core. A gap is formed between the outer peripheral surface in the direction and the connection groove bottom surface of the outer iron core.

Embodiment 5 FIG.
FIG. 10 is a partial schematic front view for explaining a coupling state between the inner iron core and the outer iron core of the armature according to the fifth embodiment of the present invention.
As shown in FIG. 10, the armature according to the present embodiment is different from the armature 10 according to the first embodiment except that the structure of the tooth portion 543 of the inner iron core 540 and the structure of the connection groove 551 of the outer iron core 550 are different. It is the same.

In the inner iron core 540, the circumferential shape of the radially outer portion 543a of the tooth portion is V-shaped with the tip directed radially outward.
The outer iron core 550 has a V-shape in which the circumferential shape of the connection groove bottom surface 551a is directed radially outward.
The angle of the inner angle θ2 of the tip portion 543d in the V-shaped tooth portion outer peripheral surface 543a is smaller than the angle of the inner angle θ3 of the tip portion 551d in the V-shaped connection groove bottom surface 551a.

In the armature of the present embodiment, the tip portion 543d of the V-shaped tooth portion outer peripheral surface 543a is in contact with the tip portion 551d of the V-shaped connecting groove bottom surface 551a, and the V-shaped tooth portion outer peripheral surface. A gap 530a is formed between the inclined portion 543e of 543a and the inclined portion 551e of the V-shaped connection groove bottom surface 551a, and has the same effect as the armature of the first embodiment.
That is, in the armature of the present embodiment, the iron core has a portion in which the tooth portion of the inner iron core and the connection groove of the outer iron core are partially in contact in the radial direction, and the diameter of the tooth portion of the inner iron core. A gap is formed between the outer peripheral surface in the direction and the connection groove bottom surface of the outer iron core.
In particular, the armature according to the present embodiment has a great effect of reducing the pressing force when the inner iron core is inserted into the outer iron core because the contact between the bottom surface of the connection groove and the outer peripheral surface of the tooth portion is a line contact.

Embodiment 6 FIG.
FIG. 11 is a partial schematic front view for explaining a coupling state between the inner iron core and the outer iron core of the armature according to the sixth embodiment of the present invention.
As shown in FIG. 11, the armature of the present embodiment is the same as the armature 10 of the first embodiment except that the structure of the outer iron core 650 is different.
In the outer iron core 650 of the present embodiment, the connection groove 651 is the same as the connection groove 51 of the first embodiment, but the outer iron core 650 is penetrated in the axial direction in the radially outer portion of the connection groove protrusion 651b. A hole (denoted as an axial through hole) 652 is provided. The axial through-hole 652 has a flat shape with a smaller radial width than the circumferential width.
Moreover, it is preferable that the formation position of the axial direction through-hole 652 is close to the connection groove protrusion part surface of the connection groove protrusion part 651b.

In the present embodiment, the teeth portion outer peripheral surface 43a of the inner iron core 40 and the surface of the connecting groove protruding portion of the outer iron core 650 are in contact with each other, and the teeth portion outer peripheral surface 43a of the inner iron core 40 and the connection groove bottom surface of the outer iron core 650 are in contact. A gap 630a is formed between the space 651a and the armature of the first embodiment.
That is, in the armature of the present embodiment, the iron core has a portion in which the tooth portion of the inner iron core and the connection groove of the outer iron core are partially in contact in the radial direction, and the diameter of the tooth portion of the inner iron core. A gap is formed between the outer peripheral surface in the direction and the connection groove bottom surface of the outer iron core.

In particular, in the armature according to the present embodiment, the tooth side surface 43b of the tooth portion 43 inserted into the connection groove 651 of the outer iron core 650 is applied to the connection groove side surface 651c by the restoring force of the connection groove protruding portion 651b elastically deformed. Since it is pressed and improves the adhesion between the teeth side surface 43b and the connection groove side surface 651c, the magnetic resistance of the iron core can be reduced.
When the armature vibrates greatly when used in a rotating electric machine, the iron core may be fixed by impregnating with resin such as varnish.

Embodiment 7 FIG.
FIG. 12 is a schematic perspective view of the outer iron core in the armature according to the seventh embodiment of the present invention.
13 is a schematic partial plan view of the outer iron core shown in FIG. 12 as viewed from the axial direction.
FIG. 14 is a partial schematic front view for explaining a coupling state between the inner iron core and the outer iron core of the armature according to the seventh embodiment of the present invention.
As shown in FIGS. 12, 13, and 14, the armature of the present embodiment is the same as the armature 10 of the first embodiment except that the structure of the outer iron core 750 is different.

In the outer iron core 750 of the present embodiment, two protrusions 751b having a triangular axial cross-section and a pointed radial tip are provided on the connection groove bottom surface 751a. Three gaps 730 a are formed between the teeth outer peripheral surface 43 a of the inner iron core 40 and the connection groove bottom surface 751 a of the outer iron core 750.
Further, n protrusions 751b and (n + 1) gaps 730a may be provided. If the number of the protrusions 751b is increased, the pressing force when the inner core 40 is inserted into the outer iron core 750 is increased. Therefore, the number n of the protrusions 751b is a value that causes the pressing force to deform the iron core when the number n is two or more. Less is better.

As shown in FIG. 13, the connection groove 751 is a dovetail whose opening is narrower than the bottom. The angle θ1 formed by the connection groove side surface 751c of the connection groove 751 and the line L1 passing through the central axis of the armature and the intermediate width of the teeth portion 43 inserted in the connection groove 751 is an acute angle. It has become.
As shown in FIG. 14, in the armature of the present embodiment, the tooth portion outer peripheral surface 43 a of the inner iron core 40 has a pointed tip in the radial direction of the protrusion 751 b formed in the connection groove 751 of the outer iron core 750. In addition, since the gap 730a is formed between the teeth portion outer peripheral surface 43a and the connection groove bottom surface 751a, the same effect as the armature of the first embodiment is obtained.

FIG. 15 is an enlarged schematic view of a region F showing a portion where the outer peripheral surface of the tooth portion of the inner iron core in FIG. 14 is in contact with the tip of the protrusion formed in the connection groove of the outer iron core.
As shown in FIG. 15, in the armature of the present embodiment, the tip of the protrusion 751b of the outer iron core 750 in contact with the teeth outer peripheral surface 43a of the inner iron core 40 is plastically deformed. The effect of reducing the pressing force when inserting the iron core is great. In addition, since the adhesion between the teeth side surface 43b and the connection groove side surface 751c is improved, the magnetic resistance of the iron core is reduced.

In the present embodiment, a plurality of protrusions 751b are provided in the connection groove 751, but the protrusions 751b are not provided in the connection groove 751, and a plurality of protrusions having the above shape are provided on the outer peripheral surface of the teeth. The pointed tip in the radial direction of the portion may be in contact with the bottom surface of the connection groove, whereby a gap may be formed between the outer peripheral surface of the tooth portion and the bottom surface of the connection groove.
That is, in the armature of the present embodiment, the iron core has a portion in which the tooth portion of the inner iron core and the connection groove of the outer iron core are partially in contact in the radial direction, and the diameter of the tooth portion of the inner iron core. A gap is formed between the outer peripheral surface in the direction and the connection groove bottom surface of the outer iron core.

Embodiment 8 FIG.
FIG. 16 is a schematic perspective view of the outer iron core in the armature according to the eighth embodiment of the present invention.
As shown in FIG. 16, the armature of the present embodiment is the same as the armature 10 of the first embodiment except that the structure of the outer iron core 850 is different.
The outer iron core 850 includes a first outer iron core region 863 and a second outer iron core region 873, and the structure of the connection groove 851 is different.
FIG. 17 is a partial schematic front view of the first outer core piece (a) and the second outer core piece (b) constituting the outer core in the armature according to the eighth embodiment of the present invention.

As shown in FIG. 17A, the first outer iron core piece 860 is the same as the outer iron core piece constituting the outer iron core 50 of the first embodiment, and the bottom side of the first connecting groove forming portion 861 (first 861a is provided with a protruding portion (referred to as a first protruding portion) 861b that protrudes in the radial direction.
As shown in FIG. 17B, the second outer core piece 870 does not have a protrusion on the second connection groove forming portion 871, and the bottom side (second second) of the second connection groove formation portion 871. 871a) is located radially inward from the position of the first connecting groove forming portion bottom 861a of the first outer core piece 860, and the first outer iron core piece 860 has a first position. It is the same as the position of the side in the radial direction of one protrusion 861b.

The outer iron core 850 of the present embodiment is configured by alternately laminating first outer iron core regions 863 and second outer iron core regions 873, and on both end surfaces in the axial direction of the outer iron core 850. The second outer core region 873 is preferably disposed.
The number m1 of core pieces in the first outer core region 863 formed by the first outer core piece 860 is equal to the number of core pieces in the second outer core region 873 formed by the second outer core piece 870. More than a few m2. For example, m2 is preferably 20% or less of the total of m1 and m2.
Moreover, it is preferable that the 2nd outer core area | region 873 is three or more places of the both ends and the intermediate part in the axial direction of the outer core 850, and each 2nd outer core area | region 873 is one or more sheets. A second outer core piece 870 is formed.

FIG. 18 is a partial front schematic view for explaining a coupling state between the inner iron core and the outer iron core in the armature according to the eighth embodiment of the present invention.
In the armature of the present embodiment, the tooth portion outer peripheral surface 43a of the inner iron core 40 has the radial side of the first protruding portion 861b of the first outer iron core piece 860 and the second outer iron core piece 870. 2 is in contact with the bottom 871a of the connection groove forming portion.
Since the gap 830a is formed between the teeth outer peripheral surface 43a and the first connecting groove forming portion bottom 861a of the first outer core piece 860, the same effect as the armature 10 of the first embodiment is obtained. Have

In the present embodiment, the outer iron core 850 is configured by alternately laminating the first outer iron core regions 863 and the second outer iron core regions 873. However, the inner iron core protrudes around the teeth portion. The first inner core region formed by the first inner core piece formed by the first inner core piece and the second inner iron core formed by the second inner core piece not provided with the protruding portion around the teeth portion. The regions may be alternately stacked.
That is, the radial side of the protruding portion of the first inner core piece and the outer periphery of the teeth portion of the second inner core piece are brought into contact with the bottom surface of the connection groove where the protruding portion of the outer core is not provided. A structure in which a gap is formed between the outer periphery of the teeth portion of the inner core piece 1 and the connection groove bottom surface of the outer iron core may be employed.

That is, in the armature of the present embodiment, the iron core has a portion in which the tooth portion of the inner iron core and the connection groove of the outer iron core are partially in contact in the radial direction, and the diameter of the tooth portion of the inner iron core. A gap is formed between the outer peripheral surface in the direction and the connection groove bottom surface of the outer iron core.
In addition, the armature of the present embodiment is provided with a region where the outer peripheral surface of the teeth portion of the inner iron core and the connection groove bottom surface of the outer iron core are in close contact.
Therefore, the gap between the outer peripheral surface of the teeth portion of the inner iron core and the bottom surface of the connection groove of the outer iron core does not penetrate from one end surface in the axial direction to the other end surface of the iron core.
Further, in the armature of the present embodiment, as shown in FIG. 18, at least both ends in the axial direction of the iron core, the region of the iron core where the outer peripheral surface of the teeth portion of the inner iron core and the connection groove bottom surface of the outer iron core are in close contact with each other. It is preferable to provide in the part.

That is, in the armature according to the present embodiment, since the gap between the outer peripheral surface of the teeth portion of the inner iron core and the bottom surface of the connection groove of the outer iron core is not communicated in the axial direction, conductive contamination enters the gap. Can be prevented. In particular, the structure in which both end portions in the axial direction of the iron core are not open improves the effect of preventing the intrusion of contamination. And, the armature of the present embodiment has the invasion of the conductive contamination into the iron core. Therefore, even when used in a rotating electrical machine, the efficiency of the rotating electrical machine does not decrease due to eddy currents generated in the contamination.

Since there is an inner iron core or an outer iron core that does not cause a gap in the contact portion, deformation when forming the outer iron core or the inner iron core is prevented.
Even in the armature according to any of the second to fifth embodiments, a plurality of iron core regions in which the outer periphery of the teeth portion of the inner iron core piece is in close contact with the connection groove bottom of the outer iron core piece are arranged in the axial direction of the iron core. By providing, the same effect is produced.

Embodiment 9 FIG.
FIG. 19 is a schematic side sectional view of a rotating electrical machine according to the ninth embodiment of the present invention.
As shown in FIG. 19, the rotating electrical machine 100 according to the present embodiment includes the armature 10 according to the first embodiment, the rotor 111 disposed with a predetermined gap on the inner peripheral side of the armature 10, The center of the rotor 111 is inserted in the axial direction, and a rotating shaft 112 that fixes the rotor 111 is provided.
The rotating shaft 112 is rotatably held by a bearing 114 provided in the housing 113.

Moreover, the armature used for the rotary electric machine 100 of the present embodiment may be any one of the armatures of the second to eighth embodiments.
In the rotating electrical machine 100 of the present embodiment, the armature is the armature of any one of the first to ninth embodiments, so that the productivity is excellent and the manufacturing cost can be reduced.

  It should be noted that the present invention can be freely combined with each other within the scope of the invention, and each embodiment can be appropriately modified or omitted.

  The armature of the present invention and the rotating electrical machine using the armature can be used for industrial equipment that requires productivity improvement and cost reduction.

10 armature, 20 coil, 25 slot cell, 30 iron core, 30a clearance,
40 inner iron core, 43 teeth part, 43a teeth part outer peripheral surface,
43b Teeth part side face, 44 crimping part, 45 thin part, 45a joint part,
45b clearance, 46 slots, 50 outer core, 50a one end face,
50b The other end face, 51 connection groove, 51a connection groove bottom surface, 51b connection groove protrusion,
51c Connection groove side surface, 100 rotating electrical machine, 111 rotor, 112 rotating shaft,
113 housing, 114 bearing, 230a clearance, 250 outer core,
251 connection groove, 251a connection groove bottom surface, 330a clearance, 340 inner iron core,
343 Teeth part, 343a Outer peripheral surface of teeth part, 343c Fitting groove,
350 outer iron core, 351 connection groove, 351a connection groove bottom surface, 351b connection groove protrusion, 430a gap, 450 outer iron core, 451 connection groove, 451a connection groove bottom surface,
451b Connection groove protrusion, 451c Connection groove side surface, 530a clearance, 540 inner iron core, 543 teeth, 543a teeth outer peripheral surface, 543d tip,
543e inclined portion, 550 outer iron core, 551 connection groove, 551a connection groove bottom surface,
551d tip, 551e inclined part, 630a gap, 650 outer iron core,
651 connection groove, 651a connection groove bottom surface, 651b connection groove protrusion,
651c connection groove side surface, 652 axial through hole, 730a clearance, 750 outer iron core,
751 connection groove, 751a connection groove bottom surface, 751b protrusion, 751c connection groove side surface,
830a gap, 850 outer iron core, 851 connecting groove, 860 first outer iron core piece,
861 1st connection groove formation part, 861a 1st connection groove formation part bottom side,
861b first protrusion, 863 first outer core region, 870 second outer core piece,
871 2nd connection groove formation part, 871a 2nd connection groove formation part bottom side,
873 Second outer core region.

Claims (15)

An armature comprising an iron core and a coil attached to the iron core, wherein the iron core is composed of an inner iron core having a tooth portion, and an outer iron core which is coupled to the tooth portion on the inner peripheral side to form a back yoke portion Because
In the inner iron core, the teeth portion is provided radially from the annular portion of the inner iron core toward the radially outer side, and the annular portion is formed from a radially inner portion of the teeth portion. It is formed by connecting the thin wall portion protruding in the circumferential direction with the thin wall portion of the adjacent teeth portion,
The outer iron core is provided with a connection groove into which a radially outer portion of the teeth portion is inserted on the inner peripheral surface,
The iron core has a portion where the teeth portion and the connection groove are partially in contact with each other in the radial direction, and a gap is formed between the radial outer peripheral surface of the teeth portion and the bottom surface of the connection groove. Armature that is. The portion where the teeth portion and the connection groove partially contact in the radial direction is a contact portion between the radial outer peripheral surface of the teeth portion and the surface of the radial protrusion provided on the bottom surface of the connection groove. The armature according to claim 1, wherein: The portion where the teeth portion and the connection groove partially contact in the radial direction is a contact portion between the surface of the radial protrusion provided on the radial outer peripheral surface of the tooth portion and the bottom surface of the connection groove. The armature according to claim 1, wherein: The part where the teeth part and the connection groove partially contact in the radial direction is a protrusion whose triangular cross section provided on the radial outer peripheral surface of the tooth part and the bottom surface of the connection groove has a triangular shape. The armature according to claim 1, wherein the armature is a contact portion with a pointed tip in a radial direction. The portion where the teeth portion and the connection groove partially contact in the radial direction is the radial sharpness of the protrusion portion having a triangular cross-sectional shape provided on the radial outer peripheral surface of the tooth portion. The armature according to claim 1, wherein the armature is a contact portion between the tip and the bottom surface of the connection groove. The armature according to any one of claims 1 to 5, wherein there are a plurality of portions where the teeth portion and the connection groove partially contact in the radial direction. The bottom surface of the connection groove protrudes inward in the radial direction, has an arc shape in the circumferential direction, and the portion where the teeth portion and the connection groove partially contact in the radial direction is the diameter of the tooth portion. The armature according to claim 1, wherein the armature is a contact portion between an outer peripheral surface in a direction and an intermediate portion in a circumferential direction of the arc-shaped bottom surface of the connection groove. The radially outer peripheral surface of the tooth portion protrudes outward in the radial direction, has an arc shape in the circumferential direction, and the portion where the teeth portion and the connection groove partially contact in the radial direction is 2. The armature according to claim 1, wherein the armature is a contact portion between an intermediate portion in a circumferential direction of an arc-shaped radial outer circumferential surface of the tooth portion and a bottom surface of the connection groove. A fitting groove for fitting with the protruding portion is provided on a radially outer peripheral surface of the tooth portion, and a radial height of the protruding portion is larger than a radial depth of the fitting groove. 3. The armature according to claim 2, wherein the portion where the teeth portion and the connection groove partially contact in the radial direction is a contact portion between the fitting groove and the protrusion. . A fitting groove for fitting with the protruding portion is provided on the bottom surface of the connecting groove, and the radial height of the protruding portion is larger than the radial depth of the fitting groove, The armature according to claim 3, wherein a portion where the tooth portion and the connection groove partially contact in the radial direction is a contact portion between the fitting groove and the protruding portion. The circumferential shape of the outer peripheral surface in the radial direction of the tooth portion is a V-shape with the tip directed radially outward, and the circumferential shape of the bottom surface of the connection groove has the tip directed radially outward. It is V-shaped, the inner angle of the tip of the outer peripheral surface is smaller than the inner angle of the tip of the bottom of the connection groove, and the teeth and the connection groove are partially in the radial direction. 2. The armature according to claim 1, wherein the portion in contact with the contact portion is a contact portion between a tip portion of the outer peripheral surface and a tip portion of the bottom surface of the connection groove. A hole penetrating the outer iron core in the axial direction is provided in a radially outer portion of the protruding portion, and the hole has a flat shape with a smaller radial width than a circumferential width. The armature according to claim 2. 2. The armature according to claim 1, wherein the iron core is provided with a plurality of regions in the axial direction in which a radially outer peripheral surface of the teeth portion is in close contact with a bottom surface of the connection groove. 14. The armature according to claim 13, wherein a region in which a radially outer peripheral surface of the tooth portion is in close contact with a bottom surface of the connection groove is provided at least at both end portions in the axial direction of the iron core. A rotation, comprising: the armature according to any one of claims 1 to 14; and a rotor provided with a predetermined gap on an inner peripheral side of the armature. Electric.

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