JP2014180090A - Stator of dynamo-electric machine, method of manufacturing stator of dynamo-electric machine and dynamo-electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the stator of a dynamo-electric machine having large tolerance for dimensional variation of the frame and the core, and to provide a method of manufacturing the stator of a dynamo-electric machine, and a dynamo-electric machine.SOLUTION: A core 5 consists of an annular yoke 51b, and a plurality of teeth 51a projecting radially inward from the yoke 51b. A frame 3 is formed by alternately arranging a low rigidity portion 31 having a low flexural rigidity and extending in the axial direction of the core 5, and a high rigidity portion 31 having a high flexural rigidity and extending in the axial direction of the core 5. The core 5 is fitted to the high rigidity portion 32 of a frame, and a cavity 7 penetrating the core 5 in the axial direction is provided in a portion corresponding to the rear side of each tooth 51a between the yoke 51b of the core 5 and the frame 3.

Description

  The present invention relates to a stator for a rotating electrical machine that drives a rotor by energizing a stator core, a method for manufacturing the stator for the rotating electrical machine, and the rotating electrical machine.

When a plurality of split iron cores are arranged in an annular shape and fitted to the inner peripheral surface of the frame, the outer peripheral surface of the split iron core is pressed radially inward by the frame, and at both ends of the back yoke portion of the split iron core, A moment toward the inside of the direction is generated.
Due to the generated moment, compressive stress is likely to be generated at the joint between the back yoke portion and the tooth portion, and if the stress is excessive, the split iron core is damaged.
As a method of fitting the divided iron core to the inner peripheral surface of the frame, there are a method of press-fitting at room temperature and a method of fixing by shrink fitting.
Of course, if it is press-fitted and fixed, it is possible to fix by shrink fitting. The tightening margin between the inner diameter of the frame during cooling and the outer diameter of the split iron core ((the outer diameter of the iron core)-(the When the inner diameter)] is large, the pressing force applied to the outer peripheral surface of the split iron core increases.
Therefore, as a method of reducing the pressing force received from the frame on the outer peripheral surface of the split iron core, the outer peripheral surface of the back yoke portion of each split iron core is at a certain distance from the rotor shaft center in the circumferential central portion. There has been proposed a rotating electrical machine having a convex portion protruding radially outward with respect to a reference circle and a concave portion recessed radially inward with respect to the reference circle at both ends in the circumferential direction (for example, Patent Literature 1).
In addition, the cylindrical frame is formed with a fold portion that is bent in the radial direction and extends in the rotational direction, and the technology that enables the cylindrical frame to expand in the radial direction by extending the fold portion. It has been proposed (for example, Patent Document 2).

JP 2011-254623 A JP2011-239576A

In the techniques proposed in Patent Document 1 and Patent Document 2, a predetermined fastening allowance is required between the inner diameter of the frame and the outer diameter of the iron core in order to reduce the pressing force by the frame.
However, each member of the rotating electrical machine has variations in dimensions, and the tightening allowance varies due to the variations in dimensions.
Even if the dimensions of each member are set so that the specified tightening allowance is maintained in consideration of the dimensional variation, an excessive tightening allowance occurs when the dimensional variation of each member is superimposed, and the inner circumference of the frame The pressure applied to the outer peripheral surface of the split iron core from the surface increases.
If it does so, the stress which generate | occur | produced in the split iron core will increase the stress iron loss in a split iron core, and will reduce the efficiency of a rotary electric machine.
Therefore, there is a problem that the tolerance of the frame with respect to the variation in the dimensions of the respective members of the rotating electrical machine is small.

  The present invention has been made to solve the above-described problems, and provides a stator for a rotating electrical machine having a large tolerance for dimensional variations between a frame and an iron core, a method for manufacturing the stator for the rotating electrical machine, and the rotating electrical machine. For the purpose.

The stator of the rotating electrical machine according to the present invention is:
In a stator of a rotating electric machine composed of an annular frame and an iron core fitted to the inner peripheral surface of the frame,
The iron core has an annular yoke part,
It consists of multiple teeth that protrude radially inward from the yoke,
The frame is formed by alternately arranging low-rigidity portions with low bending rigidity extending in the axial direction of the iron core and high-rigidity portions with high bending rigidity extending in the axial direction of the iron core,
The iron core fits into the highly rigid part of the frame,
The portion corresponding to the back side of each tooth portion between the yoke portion and the frame of the iron core is configured to have a gap penetrating in the axial direction of the iron core.
A rotating electrical machine according to the present invention includes the rotating electrical machine stator described above.

A method of manufacturing a stator for a rotating electrical machine according to the present invention includes:
In the manufacturing method of the stator of the rotating electrical machine composed of the annular frame and the iron core fitted to the inner peripheral surface of the frame,
A quenching process for quenching the entire frame;
It has an annealing process which anneals the part which a flame | frame and an iron core do not contact, cooling the part which a flame | frame and an iron core contact.

With the stator of the rotating electrical machine and the rotating electrical machine according to the present invention,
Even if the dimensional variation between the frame and the iron core overlaps and an excessive tightening margin occurs, the low rigidity part with low rigidity of the frame is deformed radially inward, so that the pressing force that the iron core receives from the frame can be reduced. .
Since the generation of stress in the iron core can be reduced, the stress iron loss in the iron core can be reduced and the efficiency of the rotating electrical machine can be maintained.

By the method for manufacturing a stator of a rotating electrical machine according to the present invention,
Even if the dimensional variation between the frame and the iron core overlaps and an excessive tightening margin occurs, the low rigidity part with low rigidity of the frame is deformed radially inward, so that the pressing force that the iron core receives from the frame can be reduced. .
Since the generation of stress in the iron core can be reduced, the stress iron loss in the iron core can be reduced and the efficiency of the rotating electrical machine can be maintained.

It is a half sectional view of the rotary electric machine using the stator which concerns on Embodiment 1 of this invention. It is a top view of the stator which concerns on Embodiment 1 of this invention. FIG. 3 is an enlarged view of a main part of FIG. 2. It is a top view which shows the state before and behind the deformation | transformation of the flame | frame which concerns on Embodiment 1 of this invention. It is a principal part enlarged view of the iron core press-fit in the flame | frame which concerns on Embodiment 2 of this invention. It is a top view which shows the state before and behind the deformation | transformation of the flame | frame which concerns on Embodiment 2 of this invention. It is a top view of the conventional stator which fitted the iron core to the flame | frame. It is a principal part enlarged view of FIG.

Embodiment 1 FIG.
Hereinafter, a stator 1 of a rotating electrical machine according to Embodiment 1 of the present invention will be described with reference to the drawings.
First, an outline of the rotating electrical machine 100 using the stator 1 will be described.
FIG. 1 is a half sectional view showing the internal structure of the rotating electrical machine 100.
The rotating electrical machine 100 includes a rotor 2 and a stator 1, and the stator 1 is a stator core 5 disposed on the outer peripheral side of the rotor 2 and a frame 3 disposed on the outer peripheral side of the stator core 5. And have.
A pair of bobbins (not shown) are mounted on the stator core 5, and a coil for generating a rotating magnetic field is wound around the bobbin.
The coil wound around the stator core 5 is connected to an external inverter.
For example, when a three-phase alternating current is supplied to the coil, a rotating magnetic field is generated in the stator 1, and the rotor 2 is rotated by an attractive force or a repulsive force caused by the rotating magnetic field.
As described above, the rotating electrical machine 100 can be applied to any electric motor such as a motor provided in a home electric appliance or a motor for driving a general industrial machine.

Next, the structure of the stator core 5 and the frame 3 will be described.
FIG. 2 is a plan view of the stator 1 in which a plurality of divided iron cores are arranged in an annular shape and fitted to the inner peripheral surface of the frame.
FIG. 3 is an enlarged view of a main part of FIG.
FIG. 7 is a plan view of a conventional stator in which a plurality of divided iron cores are arranged in an annular shape and fitted to the inner peripheral surface of the frame.
FIG. 8 is an enlarged view of a main part of FIG.
As shown in FIG. 2, the stator core 5 has a plurality of divided cores 51 for generating a rotating magnetic field arranged in an annular shape, and is fitted to the inner peripheral surface of the frame 3.
7 and 8, the shape of the outer peripheral surface of the stator core is different from that of the frame described later.

The split iron core 51 has a yoke portion 51b disposed in a substantially annular shape on the inner peripheral surface of the frame, and a teeth portion 51a protruding radially inward from the yoke portion 51b.
Thus, the split iron core 51 is configured by laminating a plurality of T-shaped electromagnetic steel plates.
Moreover, as shown in FIG. 3, the outer peripheral surface of the yoke part 51b has the plane part 51b1 and the flame | frame contact surface 51b2.
The flat portion 51b1 is formed in a portion corresponding to the back side of each tooth portion 51a, and extends in the axial direction of the stator core 5 (arrow A shown in FIG. 1) and perpendicular to the radial direction.
A gap formed between the tooth portions 51 a of the adjacent divided iron cores 51 is referred to as a slot portion 8.
The frame contact surface 51 b 2 is formed at a portion corresponding to the back side of the slot portion 8 of each divided iron core 51 and is in contact with the frame 3.
The frame contact surface 51 b 2 is formed in a shape that is R-processed with the same curvature as the inner peripheral surface of the frame 3.
Further, the frame contact surface 51b2 may be formed in a chamfered shape.

The frame 3 is formed of a bridge portion 31 and a high rigidity portion 32.
The bridge portion 31 is a portion facing the flat portion 51b1 of the yoke portion 51b.
The high-rigidity portion 32 has an iron core contact surface 32a that comes into contact with the frame contact surface 51b2 of the yoke portion 51b.
The frame 3 is not quenched into the bridge portion 31, and only the high-rigidity portion 32 is quenched, so that the high-rigidity portion 32 has higher bending rigidity than the bridge portion 31.
Further, after quenching the entire frame 3, the bridge portion 31 is annealed while cooling the high-rigidity portion 32, thereby reducing the bending rigidity of the bridge portion 31. A difference in bending rigidity may be provided.
As described above, the frame 3 is configured by alternately arranging the bridge portions 31 as the low-rigidity portions having low bending rigidity and the high-rigidity portions 32 having high bending rigidity. The stator core 5 includes the frame 3. The high-rigidity portion 32 is fitted.
Here, the bridge portion 31 has a bending rigidity lower than that of the high-rigidity portion 32, but has a rigidity that hardly deforms even if a relatively small pressing force that can hold the split iron core 51 in an immobile state is generated. .
Since the bridge portion 31 of the frame 3 is an arc-shaped curved surface, and the flat portion 51b1 of the yoke portion 51b facing this is a flat surface, the axis of the stator core 5 is between the flat portion 51b1 and the bridge portion 31. A bowl-shaped gap 7 penetrating in the direction (arrow A) is formed.

Next, how the frame 3 is deformed will be described.
FIG. 4 is a diagram illustrating a state before and after the deformation of the frame 3.
First, the stator core 5 in which the plurality of divided cores 51 are arranged in an annular shape is press-fitted and fixed to the inner peripheral surface of the frame 3.
When press-fitted and fixed, the frame 3 presses the split iron core 51 radially inward (arrow X) on the iron core contact surface 32a of the high-rigidity portion 32.
Similarly, on the frame contact surface 51b2 of the yoke portion 51b, the split iron core 51 presses the frame 3 radially outward (arrow Y).
At this time, the gap 7 is provided between the frame 3 and the yoke portion 51b of the divided iron core 51, and the bridge portion 31 of the frame 3 has a property of lower bending rigidity than the high-rigidity portion 32. The arcuate shape of the three bridge portions 31 is deformed in the radial direction (arrow Z) from the state shown by the solid line portion shown in FIG. 4 to the state shown by the dotted line portion so as to spread in the circumferential direction.

In the present embodiment, the stator core 5 is formed by annularly arranging a plurality of divided cores, but may be formed by a single iron core.
Further, the flat portion 51b1 of the yoke portion 51b may be formed as a curved surface if a gap is formed in the portion corresponding to the back side of the tooth portion 51a between the yoke portion 51b and the bridge portion 31.
As a method of attaching the stator core 5 to the frame 3, a method of shrink-fitting and fixing may be applied.

As described above, when the stator for a rotating electrical machine and the method for manufacturing a stator for a rotating electrical machine according to Embodiment 1 of the present invention are used, the stator core is fitted to the inner peripheral surface of the frame by press-fitting or the like. In addition, even when the dimensional variation of the frame and the iron core overlaps and an excessive tightening margin occurs, the pressing force applied from the frame to the divided core can be reduced by deforming the bridge portion of the frame radially inward. .
Thereby, buckling of the stator core generated by an excessive pressing force acting between the frame and the stator core can be prevented, and the efficiency of the rotating electrical machine can be maintained.

Embodiment 2. FIG.
Hereinafter, the stator of the rotating electrical machine according to the second embodiment of the present invention will be described with reference to the drawings, focusing on the differences from the first embodiment.
The configuration of the frame is different between the first embodiment and the present embodiment, and other configurations are the same as those of the first embodiment.

FIG. 5 is an enlarged view of a main part of the split iron core 51 press-fitted into the frame 203.
A portion of the frame 203 where the frame 203 and the divided iron core 51 are in contact is referred to as an iron core abutting surface 232a.
The frame 203 has a groove portion 233 extending in the axial direction of the divided core 51 on the outer peripheral surface of the back side of both end portions 232a1 in the circumferential direction of the core contact surface 232a.
A portion where the groove portion 233 of the frame 203 is formed is referred to as a thin portion 234.
Since the thin portion 234 of the frame 203 is formed with the groove portion 233, the thickness is thinner than the other portions, so that the bending rigidity is lower than the other portions.
That is, the thin-walled portion 234 of the frame 203 is a low-rigidity portion in the claims, and the other portions are relatively high-rigidity portions.
As described above, the frame 203 is configured by alternately arranging the thin-walled portions 234 that are the low-rigidity portions and the high-rigidity portions that are the other portions, and the stator core corresponds to the high-rigidity portion of the frame 203. The portion is in contact with and fitted into the iron core contact surface 232a.
The thin-walled portion 234 of the frame 203 has a bending rigidity lower than that of the surroundings, but has a rigidity that hardly deforms even if a relatively small pressing force that can hold the divided core 51 is generated. .
Also, a bowl-shaped gap 207 penetrating in the axial direction of the stator core is formed between the flat portion 51b1 of the yoke portion 51b and the inner peripheral surface of the frame 203 facing the yoke portion 51b.

Next, an aspect in which the frame 203 is deformed will be described.
FIG. 6 is a diagram illustrating a state before and after the deformation of the frame 203.
In the frame contact surface 51b2 of the split iron core 51, when the split iron core 51 presses the frame 203, the frame 203 is bent due to the gap 207 between the frame 203 and the yoke portion 51b of the split iron core 51. The thin-walled portion 234 having low rigidity is bent inward in the radial direction, and deformed in the radial direction (arrow Z) from the state shown by the solid line portion shown in FIG. 6 to the state shown by the dotted line portion.

As described above, if the stator of the rotating electric machine according to the second embodiment of the present invention is used, even if an excessive pressing force that damages the split iron core occurs, the thin wall portion of the frame is used as a base point. When the frame is bent radially inward and deformed radially inward, the pressing force applied from the frame to the divided iron core can be reduced.
As a result, it is possible to prevent damage to the split core caused by an excessive pressing force acting between the frame and the stator core, and maintain the efficiency of the rotating electrical machine.

  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.

1 stator, 2 rotor, 3,203 frame, 5 stator core,
7,207 gap, 8 slot part, 51 split iron core, 51b yoke part,
31 Bridge part, 32 High rigidity part, 32a, 232a Iron core contact surface,
232a1 both ends, 51a teeth part, 51b1 plane part,
51b2 Frame contact surface, 100 rotary electric machine, 233 groove part, 234 thin part.

Claims (10)

In a stator of a rotating electric machine composed of an annular frame and an iron core fitted to the inner peripheral surface of the frame,
The iron core includes an annular yoke portion;
A plurality of teeth protruding radially inward from the yoke,
The frame is formed by alternately arranging a low-rigidity portion with low bending rigidity extending in the axial direction of the iron core and a high-rigidity portion with high bending rigidity extending in the axial direction of the iron core,
The iron core is fitted to the high rigidity portion of the frame,
A stator of a rotating electrical machine configured to have a gap penetrating in the axial direction of the iron core in a portion corresponding to the back side of each tooth portion between the yoke portion and the frame of the iron core. 2. The stator for a rotating electrical machine according to claim 1, wherein the high-rigidity portion of the frame has an iron core abutting surface that contacts a portion corresponding to a back side of a slot portion formed between adjacent teeth portions. . The stator of a rotating electrical machine according to claim 1, wherein the high rigidity portion is formed by quenching. The low rigidity portion of the frame is an arcuate bridge portion that forms the gap with the yoke portion,
The stator of the rotating electrical machine according to claim 3, wherein the bridge portion is formed by annealing. The low-rigidity portion of the frame is a thin-walled portion that forms a groove portion of the frame extending in the axial direction of the core on the outer peripheral surface on the back side of both ends in the circumferential direction of the core contact surface. The stator of the described rotating electrical machine. 6. The rotating electrical machine according to claim 2, wherein a frame contact surface where the yoke portion contacts the iron core contact surface of the frame has an R-processed shape with the same curvature as the inner peripheral surface of the frame. stator. The stator of the rotating electrical machine according to claim 2 or 5, wherein a frame contact surface where the yoke portion contacts the iron core contact surface of the frame has a chamfered shape. The stator of a rotating electrical machine according to any one of claims 1 to 7, wherein the iron core is formed by arranging a plurality of divided iron cores in an annular shape. A rotating electrical machine comprising the rotating electrical machine stator according to any one of claims 1 to 8. In the manufacturing method of the stator of the rotating electrical machine composed of the annular frame and the iron core fitted to the inner peripheral surface of the frame,
A quenching step of quenching the entire frame;
The manufacturing method of the stator of the rotary electric machine which has the annealing process which anneals the part which the said flame | frame and the said iron core do not contact, cooling the part which the said flame | frame and the said iron core contact.

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