JP2009153236A - Rotor for rotating electrical machines and rotating electrical machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rotor for rotating electrical machines whose resistance to centrifugal force can be enhanced and to provide a rotating electrical machine. <P>SOLUTION: The rotor 12 of a rotating electrical machine 10 includes a magnetic steel sheet laminate 16 obtained by laminating multiple magnetic steel sheets 14 in the axial direction. Each magnetic steel sheet is provided with a void 22 in a position away outward from the rotation center in the radial direction. Each magnetic steel sheet 14 has a radial bridge portion 26 extending in the radial direction between voids 22 arranged side by side in the circumferential direction. Residual compressive stress is applied to rounded portions R 32, 34 at both ends of each radial bridge portion 26 in the radial direction. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotor of a rotating electrical machine and a rotating electrical machine, and more particularly to a rotor having an electrical steel sheet laminate in which a plurality of electrical steel sheets are stacked in the axial direction, and a rotating electrical machine including the rotor.

  Conventionally, the following are known as a rotor and a rotary electric machine of this kind of rotary electric machine (for example, refer to patent documents 1 and 2).

For example, in the examples described in Patent Document 1 and Patent Document 2, work hardening is performed by plastically deforming a portion where the stress is concentrated at the edge of the opening in the circular steel plate and the centrifugal force is applied. ing.
JP 2005-185081 A JP 2005-130604 A

  However, in the examples described in Patent Document 1 and Patent Document 2, in order to improve the resistance to centrifugal force, the yield point of this part is improved by the work hardening of the stress-concentrated part in the circular steel plate. There is room for improvement.

  This invention is made | formed in view of the said subject, Comprising: It aims at providing the rotor of a rotary electric machine and rotary electric machine which can improve the tolerance with respect to a centrifugal force.

  In order to solve the above-described problem, the rotor of the rotating electrical machine according to claim 1 is an electromagnetic in which a plurality of electromagnetic steel sheets each having a gap provided at a position spaced radially outward with respect to the rotation center are stacked in the axial direction. In a rotor of a rotating electrical machine having a steel sheet laminate, the electromagnetic steel sheet includes a peripheral portion that forms the air gap, and a residual compressive stress at a site where a tensile stress can occur due to centrifugal force acting during rotation. It is the structure to which is added.

  According to the rotor of the rotating electrical machine according to claim 1, tensile stress is generated in the part including the edge part forming the gap in the electromagnetic steel sheet, due to the centrifugal force acting when the electromagnetic steel sheet rotates. Even in this case, since the residual compressive stress is preliminarily applied to this part, the tensile stress at this part can be relaxed. Thereby, the tolerance with respect to a centrifugal force can be improved.

  The rotor of the rotating electrical machine according to claim 2 is the rotor of the rotating electrical machine according to claim 1, wherein the electromagnetic steel sheet extends in a radial direction between the gaps arranged side by side in the circumferential direction. In addition to having a bridge portion, a residual compressive stress is added to the radial end portion of the radial bridge portion.

  According to the rotor of the rotating electrical machine according to claim 2, centrifugal force is applied to the radial end portion of the radial bridge portion formed between the gaps arranged in the circumferential direction in the electromagnetic steel plate when the electromagnetic steel plate rotates. Even when a tensile stress is generated due to the action of the residual stress, a residual compressive stress is preliminarily applied to this part, so that the tensile stress at this part can be relaxed. Thereby, the tolerance with respect to a centrifugal force can be improved.

  The rotor of the rotating electrical machine according to claim 3 is the rotor of the rotating electrical machine according to claim 2, wherein the electromagnetic steel sheet is constrained in the radial direction at the outer peripheral portion and the radial direction in the radial bridge portion. In a state where the central portion is constrained in the circumferential direction, the radial central portion of the radial bridge portion is plastically deformed in the axial direction, so that residual compression is applied to the radial end portion of the radial bridge portion. It is characterized by a configuration in which stress is applied.

  According to the rotor of the rotating electrical machine according to claim 3, when forming the electromagnetic steel sheet, the outer peripheral part of the electromagnetic steel sheet is constrained in the radial direction, and the part on the radial center side in the radial bridge part is set in the circumferential direction. In this state, the portion on the radial center side in the radial bridge portion is plastically deformed in the axial direction, so that residual compressive stress can be applied to the radial end portion of the radial bridge portion.

  The rotor of the rotating electrical machine according to claim 4 is the rotor of the rotating electrical machine according to claim 2, wherein a plurality of the electromagnetic steel sheets are stacked, and the portion on the radial center side in the radial bridge portion. Is characterized in that residual compressive stress is applied to the radial end portion of the radial bridge portion by being plastically deformed in the circumferential direction.

  According to the rotor of the rotating electrical machine according to claim 4, when forming the electromagnetic steel sheet, a plurality of the electromagnetic steel sheets are laminated, and the radially central portion of the radial bridge portion is plastically deformed in the circumferential direction. Therefore, the residual compressive stress can be applied to the radial end portion of the radial bridge portion.

  Moreover, if it is set as this structure, when forming an electromagnetic steel plate, since a several electromagnetic steel plate can be processed simultaneously, manufacturing cost can be reduced.

  The rotor of the rotating electrical machine according to claim 5 is the rotor of the rotating electrical machine according to any one of claims 1 to 4, wherein the electromagnetic steel sheet is between the gap and the outer peripheral portion. A circumferential bridge portion extending in the circumferential direction is provided, and a residual compressive stress is applied to the circumferential end portion of the circumferential bridge portion.

  According to the rotor of the rotating electrical machine according to claim 5, centrifugal force is applied to the radial end portion of the circumferential bridge portion formed between the gap and the outer peripheral portion in the electromagnetic steel plate when the electromagnetic steel plate rotates. Even if a tensile stress is generated along with this, since the residual compressive stress is preliminarily added to this part, the tensile stress at this part can be relaxed. Thereby, the tolerance with respect to a centrifugal force can be improved.

  The rotor of the rotating electrical machine according to claim 6 is the rotor of the rotating electrical machine according to claim 5, wherein the electromagnetic steel sheet is constrained in a radial direction at a circumferentially central portion of the circumferential bridge portion. In the state, a portion of the circumferential bridge portion on the circumferential center side is plastically deformed in the axial direction so that residual compressive stress is applied to the circumferential end portion of the circumferential bridge portion. It is characterized by that.

  According to the rotor of the rotating electrical machine according to claim 6, when forming the electromagnetic steel sheet, the circumferential bridge is radially constrained in a circumferentially central portion of the circumferential bridge portion of the electromagnetic steel sheet. Since the circumferentially central portion of the portion is plastically deformed in the axial direction, residual compressive stress can be applied to the circumferential end of the circumferential bridge portion.

  Moreover, in order to solve the said subject, the rotary electric machine of Claim 7 was equipped with the rotor of the rotary electric machine as described in any one of Claims 1-6.

  According to the rotating electrical machine according to claim 7, since the rotor of the rotating electrical machine according to any one of claims 1 to 6 is provided, resistance to centrifugal force can be improved.

  As described above in detail, according to the present invention, the tensile stress can be relieved at a portion where a tensile stress can occur due to the centrifugal force acting at the time of rotation including the edge portion forming the gap in the magnetic steel sheet. Thereby, the tolerance with respect to a centrifugal force can be improved.

  Hereinafter, an embodiment of a rotating electrical machine of the present invention will be described with reference to the drawings.

  FIG. 1 shows a main configuration of a rotating electrical machine 10 according to an embodiment of the present invention. The rotating electrical machine 10 is preferably used as a drive motor of, for example, an electric vehicle or a hybrid vehicle, and is disposed so as to be rotatable on the radially inner side of the stator (not shown) that forms a rotating magnetic field. And the rotor 12.

  The rotor 12 includes an electromagnetic steel sheet laminate 16 in which a plurality of electromagnetic steel sheets 14 are stacked in the axial direction. Each electromagnetic steel sheet 14 is provided with a pair of magnet insertion holes 18 arranged in the circumferential direction at positions spaced radially outward from the rotation center. The pair of magnet insertion holes 18 has a V shape, and a permanent magnet 20 is inserted into each magnet insertion hole 18.

  In each electromagnetic steel sheet 14, gaps 22 and 24 are formed on both sides of the permanent magnet 20 by the inner wall portion of the magnet insertion hole 18 and both wall portions of the permanent magnet 20, respectively. A pair of gaps 22 arranged side by side in the circumferential direction is a radial bridge portion 26 extending in the radial direction, and a gap between the gap 24 and the outer peripheral portion 28 is a circumferential bridge portion extending in the circumferential direction. 30. R portions 32 and 34 are formed at both radial end portions of the radial bridge portion 26 and circumferential end portions of the circumferential bridge portion 30, respectively.

  Note that the R portion 32 corresponds to a portion in the present invention that includes an edge portion (inner wall portion) forming the gap 22 and where tensile stress can occur due to the centrifugal force acting when the electromagnetic steel sheet 14 rotates. . In addition, the R portion 34 corresponds to a portion in the present invention that includes an edge portion (inner wall portion) that forms the gap 24 and can generate tensile stress due to centrifugal force acting when the electromagnetic steel sheet 14 rotates. .

  Here, FIG. 2 shows a processing apparatus 36 for forming the above-described electromagnetic steel sheet 14, and FIG. 3 shows a restrained position in the electromagnetic steel sheet 14 when processed by this processing apparatus 36. And the plastic deformation position is shown.

  As shown in FIG. 2, the processing device 36 includes a punch 38 and a die 40. The punch 38 is a punch for punching for punching the magnet insertion hole 18 and a punch for plastic deformation for plastically deforming a radially central portion of the radial bridge portion 26 (shaded portion in FIG. 3). And a portion 44, which is movable with respect to the die 40 in the thickness direction of the workpiece 46 that is the base material of the electromagnetic steel plate 14.

  In addition, the punch 38 punches the magnet insertion hole 18 by the punching punch portion 42 and simultaneously restrains the outer peripheral portion 28 of the electromagnetic steel plate 14 in the radial direction of the electromagnetic steel plate 14 as shown in FIG. In a state where the radially central portion (shaded portion) in the radial bridge portion 26 is constrained in the circumferential direction of the electromagnetic steel sheet 14 (the one-dot chain line portion in FIG. 3 is the constrained portion), the plastic deformation punch portion 44 causes the radial bridge. A portion (hatched portion) on the radial center side of the portion 26 is configured to be plastically deformed in the axial direction (plate thickness direction) of the electromagnetic steel sheet 14.

  The punch 38 is configured to restrain the outer peripheral portion 28 of the electromagnetic steel plate 14 in the radial direction of the electromagnetic steel plate 14 in addition to restricting the outer peripheral portion 28 of the electromagnetic steel plate 14 in the radial direction of the electromagnetic steel plate 14. It is preferable that the electromagnetic steel sheet 14 can be restrained in the radial direction.

  FIG. 4 shows the electromagnetic steel sheet 14 processed by the processing apparatus 36 described above. As shown in this figure, the electromagnetic steel sheet 14 is processed by the processing device 36 as described above, so that the deformation force F is applied to the radial bridge portion 26 in the radial direction, and the radial direction of the radial bridge portion 26 is increased. It is set as the structure by which the residual compressive stress was added to the both ends (part enclosed by the ellipse of the dashed-dotted line) in the same direction as the action direction of centrifugal force.

  And according to the rotary electric machine 10 which consists of the said structure, there exist the following peculiar effects.

  That is, according to the rotating electrical machine 10 according to the embodiment of the present invention, when the electromagnetic steel sheet 14 is formed, the outer peripheral portion 28 of the electromagnetic steel sheet 14 is constrained in the radial direction, and the radial center of the radial bridge portion 26 is constrained. In the state where the side portion (shaded portion in FIG. 3) is constrained in the circumferential direction, the radially central portion of the radial bridge portion 26 is plastically deformed in the axial direction. Residual compressive stress can be applied to the part in the same direction as the direction of centrifugal force.

  Accordingly, the tensile stress is generated in response to the centrifugal force acting on the both ends in the radial direction of the radial bridge portion 26 formed between the gaps 22 arranged side by side in the circumferential direction in the electromagnetic steel plate 14. Even when this occurs, the tensile stress at this portion can be relaxed. Thereby, the tolerance with respect to a centrifugal force can be improved.

  Here, FIG. 5 shows an analysis result by FEM for the electromagnetic steel sheet 14, which is a processing pressure at the time of plastic working in the electromagnetic steel sheet 14 and both radial ends of the radial bridge portion 26 at the time of rotation of the rotor 12. The relationship with the maximum stress is shown.

  As is clear from this figure, the compressive residual stress applied to both ends in the radial direction of the radial bridge portion 26 increases as the processing pressure during plastic processing increases, so that the radial bridge portion when the rotor 12 rotates. The maximum stress at both radial ends of 26 is reduced. In this analysis, the maximum stress is reduced by about 30% or more compared to the case where plastic working is not performed.

  Further, FIG. 6 shows the node positions 1 to 7 in the stress analysis of the R portion 32 formed at both radial ends of the radial bridge portion 26, and FIG. 7A shows the radial bridge. FIG. 6 is a stress calculation result for the nodes 1 to 7 of the R portion 32 when residual compressive stress is applied to both ends in the radial direction of the portion 26, and the stress acting on the nodes 1 to 7 of the R portion 32 rotates. It shows when the child 12 is rotating and when it is stopped.

  FIG. 7B shows stress calculation results for the nodes 1 to 7 of the R portion 32 when no residual compressive stress is applied to both ends in the radial direction of the radial bridge portion 26 for reference. The stress acting on the nodes 1 to 7 of the R portion 32 is shown when the rotor 12 is rotating and when it is stopped.

  As shown in FIG. 7B, when no residual compressive stress is applied to both ends in the radial direction of the radial bridge portion 26, the stress becomes zero when the rotor 12 is stopped. The stress increases with the rotation of.

  On the other hand, as shown in FIG. 7A, when residual compressive stress is applied to both ends in the radial direction of the radial bridge portion 26, negative stress (residual compressive stress) is generated when the rotor 12 is stopped. Therefore, when the rotor 12 rotates, the stress is relieved by the negative stress (residual compressive stress).

  Thus, according to the rotary electric machine 10 which concerns on one Embodiment of this invention, the tensile stress of the radial direction both ends used as a stress concentration part among the radial bridge parts 26 in the electromagnetic steel plate 14 can be relieved. Thereby, the tolerance with respect to a centrifugal force can be improved.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited above, Of course, it can change and implement variously within the range which does not deviate from the main point. .

  For example, in the above embodiment, when the electromagnetic steel plate 14 is formed, the outer peripheral portion 28 of the electromagnetic steel plate 14 is constrained in the radial direction, and the radial center portion of the radial bridge portion 26 (shaded portion in FIG. 3). In a state in which the radial direction is constrained in the circumferential direction, the radially central portion of the radial bridge portion 26 is plastically deformed in the axial direction.

  That is, as shown in FIG. 8, when the electromagnetic steel sheet 14 is formed, a plurality of the electromagnetic steel sheets 14 are stacked to restrain the entire electromagnetic steel sheet 14 in the axial direction (the one-dot chain line portion in FIG. Part), the radial center portion of the radial bridge 26 may be plastically deformed in the circumferential direction.

  Even in this case, the electromagnetic steel sheet 14 can be configured such that residual compressive stress is applied to both radial ends of the radial bridge portion 26.

  Moreover, if it is set as this structure, since the several electromagnetic steel plate 14 can be processed simultaneously when forming the electromagnetic steel plate 14, manufacturing cost can be reduced.

  Moreover, in the said embodiment, although the electromagnetic steel plate 14 was set as the structure by which the residual compressive stress was added to the radial direction both ends of the radial bridge part 26, you may be comprised as follows.

  That is, the magnetic steel sheet 14 is such that the outer peripheral portion 28 of the electromagnetic steel sheet 14 is constrained in the radial direction of the magnetic steel sheet 14 and the inner wall portion of the gap 24 is constrained (the dashed line portion in FIG. 9 is the constrained portion). The circumferentially central portion of the circumferential bridge portion 30 (shaded portion in FIG. 9) is constrained in the radial direction, and in this state, the circumferentially central portion of the circumferential bridge portion 30 is plastically deformed in the axial direction. Thus, the configuration may be such that residual compressive stress is applied to the R portions 34 at both ends in the circumferential direction of the circumferential bridge portion 30. Even if it does in this way, the tolerance with respect to a centrifugal force can be improved.

  Further, the electromagnetic steel sheet 14 may be configured such that residual compressive stress is added to both the radial end portions of the radial bridge portion 26 and the circumferential end portion of the circumferential bridge portion 30. If it does in this way, the tolerance with respect to a centrifugal force can be improved more.

  Moreover, in the said embodiment, although the rotary electric machine 10 was made into what is called an inner rotor motor provided with the rotor 12 at the radial inside of the stator, it was equipped with the rotor 12 at the radial outside of the stator. It may be a so-called outer rotor motor.

  In the above embodiment, the rotating electrical machine 10 is a so-called permanent magnet motor in which the rotor 12 is provided with the permanent magnet 20. It may be said.

It is a figure which shows the principal part structure of the rotary electric machine which concerns on one Embodiment of this invention. It is a figure which shows the processing apparatus for forming an electromagnetic steel plate. It is a figure which shows the restraint position and plastic deformation position in an electromagnetic steel plate at the time of processing with a processing apparatus. It is a figure which shows the electromagnetic steel plate processed with the processing apparatus. It is a figure which shows the analysis result by FEM about an electromagnetic steel plate. It is a figure which shows the node position in the stress analysis of the R part formed in the radial direction both ends of a radial bridge part. (A) is a figure which shows the stress calculation result about each node of R part when a residual compressive stress is added to the radial direction both ends of a radial bridge part, (B) is the radial direction both ends of a radial bridge part It is a figure which shows the stress calculation result about each node of R part when the residual compressive stress is not added to. It is a figure which shows the modification at the time of carrying out plastic working of the radial direction bridge | bridging part of an electromagnetic steel plate. It is a figure which shows the modification which plastically processes the circumferential direction bridge | bridging part of an electromagnetic steel plate.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Rotating electrical machine 12 Rotor 14 Electrical steel plate 16 Electrical steel plate laminated body 22, 24 Air gap 26 Radial direction bridge part 28 Outer part 30 Circumferential direction bridge part

Claims (7)

In a rotor of a rotating electrical machine having an electrical steel sheet laminate in which a plurality of electrical steel sheets provided with gaps in the radial direction with respect to the rotation center portion are laminated in the axial direction,
The electromagnetic steel sheet is configured such that residual compressive stress is added to a portion where tensile stress can occur due to centrifugal force acting at the time of rotation including an edge portion forming the gap.
A rotor of a rotating electrical machine characterized by that. The electromagnetic steel sheet has a radial bridge portion extending in the radial direction between the gaps arranged side by side in the circumferential direction, and a configuration in which residual compressive stress is added to a radial end portion of the radial bridge portion; Being
The rotor for a rotating electrical machine according to claim 1. The electromagnetic steel sheet has a radially central portion in the radial bridge portion in a state in which a peripheral portion is constrained in the radial direction and a radially central portion in the radial bridge portion is constrained in the circumferential direction. It is configured such that residual compressive stress is applied to the radial end portion of the radial bridge portion by being plastically deformed in the axial direction.
The rotor for a rotating electrical machine according to claim 2. In a state where a plurality of the electromagnetic steel sheets are stacked, a residual compressive stress is generated at a radial end portion of the radial bridge portion by plastically deforming a radial central portion of the radial bridge portion in the circumferential direction. It is supposed to be added configuration,
The rotor for a rotating electrical machine according to claim 2. The electromagnetic steel sheet has a circumferential bridge portion extending in the circumferential direction between the gap and the outer peripheral portion, and a residual compressive stress is applied to a circumferential end portion of the circumferential bridge portion. ,
The rotor for a rotating electrical machine according to any one of claims 1 to 4, wherein the rotor is a rotating electrical machine. The electromagnetic steel sheet is plastically deformed in the axial direction at the circumferential central portion of the circumferential bridge portion in a state where the circumferential central portion of the circumferential bridge portion is constrained in the radial direction. Residual compressive stress is added to the circumferential end of the circumferential bridge portion.
The rotor for a rotating electrical machine according to claim 5. A rotating electrical machine rotor according to any one of claims 1 to 6,
Rotating electric machine characterized by that.

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