JP2009011067A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high output rotary electric machine which can reduce a high tensile stress generated at the root portions where conductor bars and a shorting ring join, and can be rotated to a high speed region. <P>SOLUTION: The rotary electric machine has a stator 3 and a rotor 5 arranged opposite to the stator. The rotor 5 has a rotor core 513, a plurality of conductor bars 515 each inserted through a plurality of slots which are formed in the axial direction of the rotor core, and short-circuit rings 512 provided at both ends of the conductor bar. The rotor core 513 is formed by laminating a plurality of steel plates having a plurality of slots punched out. The steel plate includes a chamfering part 514 formed on the periphery of the slot on one surface. The chamfered surface faces both end part sides in the axial direction of the rotor core. Furthermore, the chamfered surface is alternately positioned in the axial direction of the rotor core. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine such as a motor or a generator, and more particularly to a rotating electrical machine suitable for an induction motor using a conductor bar.

  A conventional rotor of a relatively small capacity induction motor includes, for example, a rotor core, a conductor bar, and an end ring (see, for example, Patent Document 1). A plurality of conductor bars are arranged in a slot of a rotor core formed by laminating a plurality of electromagnetic steel plates, and a short-circuit ring is fixed to both ends of the conductor bar. Aluminum or an aluminum alloy, or copper or a copper alloy is used as a material for the conductor bar and the short-circuit ring. Since the conductor bar and the short-circuit ring are integrally formed by a casting method, the mass productivity is good.

JP-A-10-322990

  However, for example, in a rotor having the configuration described in Patent Document 1, when a current starts to flow through the conductor bar during normal starting, a sudden temperature rise occurs in the conductor bar and the short-circuit ring, and at the same time, centrifugal force due to rotation is generated. Be loaded. In an abnormally activated state where the rotating shaft is constrained, there is no load due to rotation, but the time during which a large current flows through the conductor bar is longer than usual, and a large temperature rise occurs in the conductor bar and the short-circuit ring. Expansion in the axial direction occurs due to thermal deformation accompanying temperature rise, and expansion in the radial direction due to centrifugal force occurs simultaneously at the time of start-up associated with rotational deformation. When the conductor bar expands and a gap is generated between the short-circuit ring and the rotor core, the short-circuit ring can be deformed to bend at an angle in the axial direction. Therefore, in order to absorb the expansion deformation of the short-circuit ring, the conductor bar is pulled in the expansion direction of the short-circuit ring, and the conductor bar is bent. Due to this bending deformation, a large tensile stress is generated at the base of the short-circuit ring of the conductor bar. Since this tensile load is repeatedly applied by repeated starting and stopping and abnormal starting, it has been a cause of fatigue failure of the conductor bar.

  An object of the present invention is to provide a high-power rotating electrical machine that can reduce high tensile stress generated at the base of a conductor bar and a short-circuit ring and can be rotated to a high-speed region.

(1) In order to achieve the above object, the present invention includes a stator and a rotor disposed to face the stator, and the rotor includes a rotor core and the rotor core. A plurality of conductor bars respectively inserted into a plurality of slots formed in the axial direction of the conductor bars, and short-circuit rings provided at both ends of the conductor bars, and the rotor core is formed by punching the plurality of slots. A rotating electrical machine formed by laminating a plurality of steel plates, wherein the steel plates located at both ends in the axial direction of the rotor core are chamfered portions formed around the slots on one surface thereof The surface where the chamfered portion is formed faces the both end portions in the axial direction of the rotor core.
With such a configuration, high tensile stress generated at the base portion of the conductor bar and the short-circuit ring can be reduced, and the rotating machine can be rotated to a high speed region, whereby a high-output rotating electrical machine can be obtained.

  (2) In the above (1), preferably, all of the steel plates are provided with a chamfered portion formed around the slot on one surface thereof.

  (3) In the above (2), preferably, the rotor core is formed by laminating an even number of the steel plates, and the surface on which the chamfered portion is formed is in the axial direction of the rotor core. Are arranged alternately.

  (4) In said (2), Preferably, the said conductor bar and the said short circuit ring are integrally molded by die-casting.

  (5) In the above (1), preferably, the conductor bar is inserted into the slot, and the short-circuit rings are fixed to both ends of the conductor bar, respectively.

(6) Moreover, in order to achieve the said objective, this invention has a stator and the rotor arrange | positioned facing this stator, and the said rotor is a rotor core and this rotation. A plurality of conductor bars respectively inserted into a plurality of slots formed in the axial direction of the core, and short-circuit rings provided at both ends of the conductor bars, and the rotor core includes the plurality of slots. A rotary electric machine formed by laminating a plurality of punched steel sheets, wherein a plurality of slots of the rotor core are spread toward one end side.
With such a configuration, high tensile stress generated at the base portion of the conductor bar and the short-circuit ring can be reduced, and the rotating machine can be rotated to a high speed region, whereby a high-output rotating electrical machine can be obtained.

  According to the present invention, high tensile stress generated at the base of the conductor bar and the short-circuit ring can be reduced, and the output can be increased by being rotated to a high speed region.

  Hereinafter, the configuration of the rotating electrical machine according to the first embodiment of the present invention will be described with reference to FIGS.

  In this embodiment, an example of a rotating electrical machine will be described based on an electric motor used in a hybrid vehicle. The hybrid automobile electric motor of this embodiment has both a function of a driving motor that drives wheels and a function of a generator that generates electric power, and the functions are switched depending on the running state of the automobile. ing.

Initially, the whole structure of the rotary electric machine by this embodiment is demonstrated using FIGS. 1-3.
FIG. 1 is a side sectional view showing an overall configuration of a rotating electrical machine according to a first embodiment of the present invention. FIG. 2 is a perspective view of a rotor used in the rotating electrical machine according to the first embodiment of the present invention. FIG. 3 is a perspective view of a main part of the rotor used in the rotating electrical machine according to the first embodiment of the present invention. In each figure, the same numerals indicate the same parts.

  As shown in FIG. 1, the induction type rotating electrical machine has a bottomed cylindrical housing 1 that is open at one end in the axial direction, and a cover 2 that seals the open end of the housing 1. A water channel forming member 22 is provided inside the housing 1, one end of the water channel forming member 22 is fixed between the housing 1 and the cover 2, and a water channel 24 is formed between the stator 4 and the housing 1. Is done. Cooling water is taken into the water channel 24 from the cooling water inlet 32, and the cooling water is discharged from the water channel 24 to the outlet 34 to cool the rotating electrical machine. The housing 1 and the cover 2 are fastened by a plurality of, for example, six bolts 3.

  A stator 4 is fixed inside the water channel forming member 22 provided on the inner periphery of the housing 1 by shrink fitting or the like. The stator 4 includes a stator core 412 provided with a plurality of slots at equal intervals in the circumferential direction, and three-phase stator windings wound in each slot. In this example, the stator windings are connected in a star connection with 8 poles and 48 slots, and each phase is a 2Y connection in which a pair of stator coils are connected in parallel.

  In addition, the rotor 5 is disposed on the inner periphery of the stator core 412 so as to be rotatable through a minute gap so as to face the stator core 412. The rotor 5 is fixed to the shaft 6 and rotates integrally with the shaft 6. The shaft 6 is rotatably supported on both sides thereof by ball bearings 7a and 7b acting as bearings provided on the housing 1 and the cover 2, respectively. Of these bearings 7 a and 7 b, the bearing 7 a on the cover 2 side is fixed by a substantially rectangular fixing plate 8. The bearing 7 b on the bottom side of the housing 1 is fixed to a recess provided at the bottom of the housing 1. For this reason, the rotor 5 rotates relative to the stator 4. The rotation force of the shaft 6 is output to the outside by the pulley 12 attached to the cover 2 side end of the shaft 6 by the nut 11 via the sleeve 9 and the spacer 10, or the rotation force from the pulley 12 is applied to the shaft 6. Entered. Since the outer periphery of the sleeve 9 and the inner periphery of the pulley 12 are slightly conical, the pulley 12 and the shaft 6 are firmly integrated by the tightening force of the nut 11 so that they can rotate integrally. It has become.

  As shown in FIGS. 1 and 3, the rotor 5 has conductor bars 511 extending in the rotation axis direction at equal intervals over the entire circumference, and as shown in FIG. This is a cage rotor in which a pair of short-circuit rings 512 are connected so as to short-circuit each conductor bar 511 at both ends. As shown in FIG. 3, the conductor bar 511 is embedded in a rotor core 513 made of a magnetic material.

  A rotor core 513 shown in FIGS. 2 and 3 is a laminated steel plate formed by punching or etching a magnetic steel plate having a thickness of about 0.05 to 1 mm and laminating the formed electromagnetic steel plates. . As shown in FIGS. 2 and 3, substantially fan-shaped cavities 514 are provided at equal intervals in the circumferential direction on the inner peripheral side of the rotor core 513 for weight reduction. A plurality of spaces in which the respective conductor bars 511 are arranged are provided on the outer peripheral side. The rotor core 513 has a conductor bar 511 on the stator side, and a rotor yoke 51 (FIG. 1) for making a magnetic circuit inside the conductor bar 511.

  In this embodiment, the stator has an 8-pole stator winding, and the thickness of the magnetic circuit formed in the rotor yoke 530 in the radial direction is larger than that of an induction motor having two or four poles. Can be thinned. The thickness can be reduced by increasing the number of poles compared to 8 poles, but there is a problem in that the output and efficiency are lowered if 12 poles or more. Accordingly, the rotating electric machine for running the vehicle including the engine start function is preferably 6 to 10 poles, particularly 8 or 10 poles.

  Each conductor bar 511 and short-circuit ring 512 of the rotor 5 are made of aluminum, and are formed so as to be integrated with the rotor core 513 by die casting. The short-circuit rings 512 arranged at both ends of the rotor core are provided so as to protrude from the rotor core 513 to both ends in the axial direction.

  A rotation sensor 13 for detecting the rotation speed and the rotor position is provided on the bottom side of the housing 1. The rotation sensor 13 may use a resolver.

Next, the configuration of the electrical steel sheet used for the rotor core of the rotating electrical machine according to the present embodiment will be described with reference to FIG.
FIG. 4 is a perspective view showing a configuration of an electromagnetic steel sheet used for the rotor core of the rotating electrical machine according to the first embodiment of the present invention. In FIG. 4, the same reference numerals as those in FIGS. 1 to 3 denote the same parts.

  The rotor core 513 is made of a laminated steel sheet formed by punching a magnetic steel sheet having a thickness of 0.05 to 1.0 mm and laminating the formed electromagnetic steel sheets. Cavities 514 are provided at equal intervals in the circumferential direction on the inner peripheral side of the punched magnetic steel sheet for weight reduction. A slot 511 in which a conductor bar is disposed is provided on the outer peripheral side.

  Further, a chamfered portion 541 is formed on one surface of the punched electromagnetic steel sheet and around the slot 511. The chamfered portion 541 is formed by pressing a die. The cross-sectional shape of the chamfered portion 541 is an arc shape.

  That is, a shape corresponding to the chamfered portion 541 is processed by pressing a die on a 0.05 to 1.0 mm thick electromagnetic steel sheet, and then formed into the shape shown in FIG. 4 by punching. Here, the slot 511 in which the chamfered portion 541 is formed has a shape spreading toward one end side of the rotor core.

  An etching process can be used instead of the punching process. In this case, a shape corresponding to the chamfered portion 541 is processed by die pressing on an electromagnetic steel sheet having a thickness of 0.05 to 1.0 mm, and then formed into the shape shown in FIG. 4 by etching.

  Note that the cross-sectional shape of the chamfered portion 541 may be a tapered shape instead of an arc shape. In this case, the shape corresponding to the chamfered portion 541 is formed by changing the tip shape of the die and pressing the die.

Next, the configuration of the rotor of the rotating electrical machine according to the present embodiment will be described with reference to FIG.
FIG. 5 is a cross-sectional view showing the configuration of the rotor of the rotating electrical machine according to the first embodiment of the present invention. Note that FIG. 5B illustrates an enlarged state of the main part of FIG.
5, the same reference numerals as those in FIGS. 1 to 4 indicate the same parts.

  In the present embodiment, the rotor iron core 513 uses an even number of punched magnetic steel sheets shown in FIG. 4 as a set of two sheets, and the second electromagnetic steel sheet is compared to the first electromagnetic steel sheet. These are reversed, and these are combined and laminated to a predetermined thickness. The stacked state is as shown in FIG.

  As illustrated in an enlarged view in FIG. 5B, the cross-sectional shape of the chamfered portion 541 is an arc shape. As a set of two sheets, a slot in which a conductor bar 514 is formed of two laminated electromagnetic steel sheets by inverting the second electromagnetic steel sheet with respect to the first electromagnetic steel sheet and combining them. The inner peripheral side of is semicircular.

  The conductor bar 515 and the short-circuit ring 512 are made of aluminum, and are formed so as to be integrated with the rotor core 513 by die casting. Note that the short-circuit rings 512 arranged at both ends of the rotor core 513 are provided so as to protrude from the rotor core 513 to both ends in the axial direction.

  By integrally shaping the conductor bar 515 and the short-circuit ring 512 by die casting, an uneven portion corresponding to the uneven shape of the inner peripheral surface of the slot of the laminated magnetic steel plate is easily created on the surface of the conductor bar 515. be able to.

  Here, the convex portion of the conductor bar 515 has an arc shape that follows the chamfered portion 541. When there is no chamfered portion 541, the cross-sectional shape of the slot has a corner, and stress concentrates on this corner. On the other hand, by forming the chamfered portion 541 and then forming the conductor bar 515 by die casting, it is possible to prevent stress concentration occurring in the corner portion. Furthermore, the stress concentration can be dispersed by providing a plurality of uneven portions.

  As described above, the chamfered portions 541 are formed in the slots 511 in which the conductor bars 515 of the rotor core 513 are inserted, and are laminated in combination with each other, so that the axial deformation of the conductor bars 515 is caused by the uneven portions. The gap between the short-circuit ring 512 and the rotor core 513 is not generated. Therefore, bending deformation of the conductor bar 515 does not occur, and the base portion of the conductor bar 515 and the short-circuit ring 512 is not pulled. Therefore, the tensile stress at the base portion can be reduced, the fatigue strength can be increased, the rotating portion can be rotated to a high speed region, and a high-output rotating electrical machine can be realized.

  In addition, since the chamfered portions 541 are formed in the slots 511 in which the conductor bars 515 of the rotor core 513 are inserted and are laminated in combination, the both ends of the rotor core 513 are open. The hot water flow of die casting can be improved.

  In addition, in the process of forming the chamfered portion 541 in the slot 511 in which the conductor bar 515 of the rotor core 513 is inserted, the preliminary punching process is performed in one stage and the punching process is performed in two stages without changing the mold of the punching process. As a result, the chamfered portion 541 can be formed in the slot 511, so that it can be produced with conventional equipment.

Here, the other structure of the electromagnetic steel sheet used for the rotor core of the rotary electric machine by this embodiment is demonstrated using FIG.6 and FIG.7.
FIG. 6 is a perspective view showing another configuration of the electromagnetic steel sheet used for the rotor core of the rotating electrical machine according to the first embodiment of the present invention. FIG. 7 is a perspective view showing another configuration of the electromagnetic steel sheet used for the rotor core of the rotating electrical machine according to the first embodiment of the present invention. 6 and 7, the same reference numerals as those in FIG. 4 indicate the same parts.

  The punched magnetic steel sheet used for the rotating iron core 5135 shown in FIG. 5 has a semi-closed slot 511 (open slot), whereas the punching used for the rotating iron core 513A shown in FIG. The magnetic steel sheet is provided with a fully closed slot 511A (closed slot). Even in such a case, the chamfered portion 514A is formed on one surface of the electromagnetic steel sheet and around the slot 511A.

  Further, the punched electromagnetic steel sheet used for the rotating iron core 513B shown in FIG. 7 has a double squirrel-shaped slot 511B. Even in such a case, the chamfered portion 514B is formed on one surface of the electromagnetic steel sheet and around the slot 511B.

  As described above, according to the present embodiment, the high tensile stress generated at the base portion of the conductor bar and the short-circuit ring is reduced by providing the chamfered portion in the slot of the rotor core without changing the outer shape of the motor. Can be rotated to a high speed region, and a high-output rotating electrical machine can be obtained.

Next, the configuration of the rotor of the rotating electrical machine according to the second embodiment of the present invention will be described with reference to FIG.
FIG. 8 is a cross-sectional view showing the configuration of the rotor of the rotating electrical machine according to the second embodiment of the present invention. In FIG. 8, the same reference numerals as those in FIG. 5 denote the same parts.

  In the present embodiment, the rotor core 513C is laminated so that the chamfered portions are formed on the same side except for one, using a plurality of punched electromagnetic steel sheets shown in FIG. And the last one sheet is to invert and laminate the electromagnetic steel sheets. The stacked state is as shown in FIG.

  The conductor bar 515C and the short-circuit ring 512 are made of aluminum, and are formed so as to be integrated with the rotor core 513C by die casting. The short-circuit rings 512 disposed at both ends of the rotor core 513C are provided so as to protrude from the rotor core 513C to both ends in the axial direction.

  By integrally shaping the conductor bar 515C and the short-circuit ring 512 by die casting, an uneven portion corresponding to the uneven shape of the inner peripheral surface of the slot of the laminated magnetic steel sheet is easily created on the surface of the conductor bar 515C. be able to. By forming the chamfered portion 541 shown in FIG. 4 and then forming the conductor bar 515C by die casting, it is possible to prevent stress concentration occurring in the corner portion. Furthermore, the stress concentration can be dispersed by providing a plurality of uneven portions.

  As described above, the chamfered portion 541 is formed in the slot in which the conductor bar 515C of the rotor core 513C is inserted and laminated together, so that the axial deformation of the conductor bar 515C is constrained by the rotor core 513C by the uneven portion. Thus, there is no gap between the short-circuit ring 512 and the rotor core 513C. Therefore, bending deformation of the conductor bar 515C does not occur, and the base portion of the conductor bar 515C and the short-circuit ring 512 is not in a tensile state. Therefore, the tensile stress at the base portion can be reduced, the fatigue strength can be increased, the rotating portion can be rotated to a high speed region, and a high-output rotating electrical machine can be realized.

  Further, the chamfered portion 541 is formed in the slot in which the conductor bar 515C of the rotor core 513C is inserted and stacked, and the last one is inverted and stacked, so that both ends of the rotor core 513 are opened. Therefore, the flowability of the die cast casting of the conductor bar 515 can be improved.

  Further, in the process of forming the chamfered portion 541 in the slot in which the conductor bar 515C of the rotor core 513C is inserted, the preliminary punching process is performed in one stage and the punching process is performed in two stages without changing the mold of the punching process. Since the chamfered portion 541 can be formed in the slot, it can be produced with conventional equipment.

  In addition, in the embodiment shown in FIG. 5, an operation process for reversing the electromagnetic steel sheet punched every other sheet is necessary, whereas a process for reversing only the outermost sheet is added. Since it can produce, a manufacturing process becomes simple.

  As described above, according to the present embodiment, the high tensile stress generated at the base portion of the conductor bar and the short-circuit ring is reduced by providing the chamfered portion in the slot of the rotor core without changing the outer shape of the motor. Can be rotated to a high speed region, and a high-output rotating electrical machine can be obtained.

Next, the configuration of the rotor of the rotating electrical machine according to the third embodiment of the present invention will be described with reference to FIG.
FIG. 9 is a cross-sectional view showing the configuration of the rotor of the rotating electrical machine according to the third embodiment of the present invention. 9, the same reference numerals as those in FIGS. 1 to 5 denote the same parts.

  In the present embodiment, as shown in FIG. 4, the rotor core 513D of the rotor 5D uses two electromagnetic steel sheets in which the slots 511 are punched, and the electromagnetic steel sheets in which the other slots 511 are punched are What has no chamfered part is used. 4 are laminated with punched electromagnetic steel sheets without chamfered portions, and the punched electromagnetic steel plates shown in FIG. 4 are arranged at both ends so that the chamfered portions 514 are positioned on the axial end side. .

  The conductor bar 515D and the short-circuit ring 512D are made of copper. Copper conductor bars 515D are respectively inserted into the plurality of slots 514 of the rotor core 513D, and short-circuit rings 512 are connected to one end portions of the plurality of conductor bars 515 by brazing or the like. In addition, although illustration is abbreviate | omitted, a short circuit ring is connected also to the other edge part of the some conductor bar 515 by brazing.

  As described above, the both ends of the rotor 5D are made of a punched electromagnetic steel plate having a chamfered portion 541, combined so that the chamfered portion is open on the end side, and further, in the center portion thereof, By laminating electromagnetic steel plates having no chamfered portions to a predetermined thickness, the chamfered portions 541 improve the insertability when the conductor bars 515D having substantially the same shape as the slots 511 are respectively inserted into the slots 511.

  Further, at the base portion of the conductor bar 515D and the short-circuit ring 512D, since there is a chamfered portion 541 in the tension state, stress concentration can be reduced, fatigue strength can be increased, and rotation to a high speed region can be achieved. An output rotating electrical machine is possible.

  As described above, according to the present embodiment, the high tensile stress generated at the base portion of the conductor bar and the short-circuit ring is reduced by providing the chamfered portion in the slot of the rotor core without changing the outer shape of the motor. Can be rotated to a high speed region, and a high-output rotating electrical machine can be obtained.

  Although the embodiments of the present invention have been described above, the points common to the embodiments shown in FIGS. 5, 8, and 9 are that at least a plurality of punched electromagnetic steel sheets are stacked to form a rotor. When forming the iron core, chamfered portions are formed in the electromagnetic steel sheets positioned at both axial end portions thereof, and the chamfered portions are positioned on both sides in the axial direction of the rotor core. Thereby, the stress concentration at the base of the conductor bar and the short-circuit ring can be reduced.

  Moreover, in embodiment shown in FIG. 5, FIG. 8, furthermore, not only the both ends of a rotor iron core but the punching processed electromagnetic steel sheet located in the center also has a chamfered part, and stress concentration is carried out. Can be distributed.

Here, in the embodiment of FIG. 8, workability can be improved by adopting a configuration in which only one of the laminated steel sheets is reversed.

It is side surface sectional drawing which shows the whole structure of the rotary electric machine by the 1st Embodiment of this invention. It is a perspective view of the rotor used for the rotary electric machine by the 1st Embodiment of this invention. It is a perspective view of the principal part of the rotor used for the rotary electric machine by the 1st Embodiment of this invention. It is a perspective view which shows the structure of the electromagnetic steel plate used for the rotor core of the rotary electric machine by the 1st Embodiment of this invention. It is sectional drawing which shows the structure of the rotor of the rotary electric machine by the 1st Embodiment of this invention. It is a perspective view which shows the other structure of the electromagnetic steel plate used for the rotor core of the rotary electric machine by the 1st Embodiment of this invention. It is a perspective view which shows the other structure of the electromagnetic steel plate used for the rotor core of the rotary electric machine by the 1st Embodiment of this invention. It is sectional drawing which shows the structure of the rotor of the rotary electric machine by the 2nd Embodiment of this invention. It is sectional drawing which shows the structure of the rotor of the rotary electric machine by the 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 5 ... Rotor 6 ... Shaft 511 ... Slot 512 ... Short-circuit ring 513 ... Rotor core 514 ... Hollow part 515 ... Conductive bar 541 ... Chamfering part

Claims (6)

Having a stator and a rotor arranged opposite to the stator,
The rotor has a rotor core, a plurality of conductor bars respectively inserted into a plurality of slots formed in the axial direction of the rotor core, and short-circuit rings provided at both ends of the conductor bars. ,
The rotor core is a rotating electrical machine formed by laminating a plurality of steel plates from which the plurality of slots are punched,
The steel plate located at both ends in the axial direction of the rotor core includes a chamfered portion formed around the slot on one surface thereof,
The rotating electric machine characterized in that the surface on which the chamfered portion is formed faces both ends of the rotor core in the axial direction. The rotating electrical machine according to claim 1, wherein
All of the steel sheets are provided with a chamfered portion formed around the slot on one surface thereof. In the rotating electrical machine according to claim 2,
The rotor core is formed by laminating an even number of the steel plates,
The rotating electrical machine characterized in that the surfaces on which the chamfered portions are formed are alternately positioned in the axial direction of the rotor core. In the rotating electrical machine according to claim 2,
The rotating electric machine characterized in that the conductor bar and the short-circuit ring are integrally formed by die casting. The rotating electrical machine according to claim 1, wherein
The conductor bar is inserted into the slot;
The rotating electrical machine, wherein the shorting rings are fixed to both ends of the conductor bar, respectively. Having a stator and a rotor arranged opposite to the stator,
The rotor has a rotor core, a plurality of conductor bars respectively inserted into a plurality of slots formed in the axial direction of the rotor core, and short-circuit rings provided at both ends of the conductor bars. ,
The rotor core is a rotating electrical machine formed by laminating a plurality of steel plates from which the plurality of slots are punched,
A rotating electric machine characterized in that a plurality of slots of the rotor core are widened toward one end side.

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