JP2011259669A - Stator and rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator and a rotary electric machine capable of restricting damage of an insulator film of a conducting wire.SOLUTION: A conducting wire 10 comprises: a plurality of coil parts 11 accommodated in a plurality of slots respectively in a stator core to form a coil; and a crank part 12 connecting a plurality of the coil parts 11 and extending in a circumferential direction of the stator core to bend in a deformation direction. The conducting wire 10 is coated with an insulator film 18. A cross-section of the conducting wire 10 orthogonal to a longer direction is a rectangle in the coil part 11 and corner parts of the cross-section of the conducting wire 10 orthogonal to the longer direction are cut off at a part adjacent to other conducting wires in the crank part 12.

Description

  The present invention relates to a stator and a rotating electric machine, and more specifically to a stator configured by winding a conducting wire and a rotating electric machine using the stator.

  Conventionally, the structure of the stator is, for example, JP 2009-11064 A (Patent Document 1), JP 2003-88021 A (Patent Document 2), JP 2000-197294 A (Patent Document 3), and JP 2009. No.-11151 (Patent Document 4).

JP 2009-11064 A JP 2003-88021 A JP 2000-197294 A JP 2009-11115 A

  In Patent Document 1, the stator winding includes a pair of slot accommodating portions accommodated in slots separated by a predetermined pitch, and a turn portion that connects the pair of slot accommodating portions at both ends of the stator core. The slot housing portion is connected to the turn portion at a crank portion bent in the circumferential direction adjacent to each other at the end portion of the stator core, and a plurality of conductor wires are laminated in surface contact with each other, and a coating resin is provided on the outer periphery thereof. A stator winding provided with an insulating coating consisting of layers is disclosed.

  In Patent Document 2, the conductor wire is formed such that the slot accommodating portion accommodated in the slot is formed in a flat cross section, the coil end portion connecting the end portions of the slot accommodating portion is formed in a substantially circular cross section, An alternator stator is disclosed that is arranged in at least one row in the radial direction and accommodated in a plurality of layers in a slot.

  Patent Document 3 discloses a concentrated winding coil that prevents flat edges from being pressed by making the cross-sectional shape of a coil wire round at a coil end having a row change and a layer change portion, thereby preventing coating damage. Yes.

  In Patent Document 4, a stator of a rotating electrical machine that is disposed at a position facing a rotor that forms a plurality of magnetic poles that are alternately different in the circumferential direction is insulated from a stator core that has a plurality of slots in the circumferential direction. A stator winding which is covered with a coating and is formed of a wire having a substantially rectangular cross-sectional shape and wound around a slot, and the wire includes a slot accommodating portion accommodated in a slot in a different circumferential direction, A turn portion that connects the slot accommodating portions to each other, and the protruding portion of the turn portion that protrudes from the slot is formed in a stepped shape toward the two slots that are accommodated across the wire. In addition, it is disclosed that a concave portion is provided inside a step-shaped bent portion.

  In the prior art, there has been a problem that the ridges of the flat wires are in contact with each other at the coil end portion and the insulating coating is easily damaged.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a stator and a rotating electrical machine capable of preventing damage to an insulating film.

  A stator according to the present invention connects a plurality of coil portions that are housed in each of a plurality of slots of the stator core to form a coil, and connects the plurality of coil portions in the radial direction while extending in the circumferential direction of the stator core. A conductor having a bent crank part, the conductor is covered with an insulating film, the coil part has a rectangular cross section perpendicular to the longitudinal direction of the conductor, and the crank part has a conductor in a portion adjacent to the other conductors. The corners of the cross section perpendicular to the longitudinal direction are cut off.

  In the stator configured as described above, in the cross section of the crank portion, the corner of the conductor is cut off at a portion adjacent to the other conductor, so that the corner of the conductor is prevented from contacting the other conductor at the crank portion. Can do. As a result, damage to the insulating film in the crank portion can be suppressed.

  More preferably, the cross section orthogonal to the longitudinal direction of the conducting wire at the crank portion is D-shaped. In this case, the cross-sectional area can be increased by using the D shape as compared with the case where the cross section is round.

  Preferably, the stator further includes a stator core having teeth inserted into the coil.

  Preferably, in a cross section along the radial direction of the slot of the stator core, the first phase conductor is fitted in the slot, and the second phase conductor is located outside the slot.

  A rotating electrical machine according to the present invention includes any one of the above-described stators and a rotor positioned on the inner peripheral side of the stator.

  According to the present invention, it is possible to provide a stator capable of suppressing damage to the insulating film on the outer periphery of the conducting wire and a rotating electrical machine including the stator.

It is sectional drawing of the rotary electric machine which has a stator according to Embodiment 1 of this invention. FIG. 2 is a side view of a stator including a coil end, viewed from a direction indicated by an arrow II in FIG. FIG. 3 is an enlarged side view showing a quarter portion of a stator constituting the rotating electrical machine shown in FIG. 2. It is a perspective view of the overlapping part of the conducting wire in a stator seen from the direction shown by arrow IV in FIG. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4 in one coil portion of the stator. FIG. 3 is a perspective view of a crank portion where a conducting wire bends as seen from a direction indicated by an arrow VI in FIG. 2. It is sectional drawing which shows arrangement | positioning of the conducting wire in the crank part along the VII-VII line in FIG. It is a figure which shows the wiring structure for driving a rotary electric machine provided in a stator. It is sectional drawing which shows the conducting wire fitted to one slot part along the IX-IX line in FIG. It is sectional drawing which shows arrangement | positioning of the conducting wire according to one situation in Embodiment 2 of this invention. It is sectional drawing which shows arrangement | positioning of the conducting wire according to another situation in Embodiment 2 of this invention. It is a figure which shows the coil | winding structure in the stator according to a comparative example.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, the same or corresponding parts are denoted by the same reference numerals, and description thereof will not be repeated. In addition, the embodiments can be combined.

(Embodiment 1)
1 is a cross-sectional view of a rotating electrical machine having a stator according to Embodiment 1 of the present invention. Referring to FIG. 1, rotating electric machine 100 includes a rotor 140 and a stator 150 provided on the outer periphery of rotor 140. The rotor 140 can rotate around the shaft 130.

  The stator 150 is disposed on the outer peripheral side of the rotor 140, and includes a cylindrical stator core 110 and a coil end 120 constituted by a coil wound around the stator core 110. The rotor 140 is located on the inner peripheral side of the cylindrical stator core 110.

  FIG. 2 is a side view of the stator including the coil end, as viewed from the direction indicated by the arrow II in FIG. Referring to FIG. 2, a coil is wound around stator core 110 along the circumferential direction to form coil end 120. The coil end 120 is constituted by a conductive wire 10 as a conductor. The conducting wire 10 is disposed so as to cover the surface of the stator core 110. A shaft 130 and a rotor 140 are located on the inner peripheral side of the stator core 110. A permanent magnet is embedded in the rotor 140.

  FIG. 3 is an enlarged side view showing a quarter portion of the stator constituting the rotating electrical machine shown in FIG. Referring to FIG. 3, conductive wire 10 is arranged to bend toward the outer peripheral side as it extends clockwise.

  FIG. 4 is a perspective view of the overlapping portion of the conductors in the stator as seen from the direction indicated by arrow IV in FIG. With reference to FIG. 4, the conducting wire 10 includes a coil portion 11 and a crank portion 12 that connects the plurality of coil portions 11. The coil part 11 forms a coil 13 that is a hollow part, and teeth of a stator core are inserted into the coil 13. Conductive wire 10 includes U-phase conductive wire 10U, V-phase conductive wire 10V, and W-phase conductive wire 10W. That is, this rotary electric machine is a three-phase AC rotary electric machine. The coil portion 11 forms a coil 13, and a part of the portion connecting the coil portions 11 is a crank portion 12. The crank part 12 is bent in the radial direction. In the coil part 11 which is a slot part, conducting wires of the same phase are laminated, and a magnetic field is generated by the coil part 11.

  FIG. 5 is a cross-sectional view in one coil portion of the stator taken along line VV in FIG. Referring to FIG. 5, one coil portion 11 is fitted with conductive wires having the same phase. In the example of FIG. 5, the conducting wire constituting the U-phase conducting wire 10 </ b> U is fitted into the coil portion 11. And in the crank part 12 on the coil part 11, each conducting wire which comprises U phase conducting wire 10U, V phase conducting wire 10V, and W phase conducting wire 10W is arrange | positioned. Each conducting wire 10 is configured in a D shape. In addition, the conducting wire 10 is not limited to the D shape, and it is sufficient that at least one corner portion is cut off in a cross section orthogonal to the longitudinal direction of the conducting wire 10.

  A coil of U-phase conducting wire 10U, a coil of V-phase conducting wire 10V, and a coil of W-phase conducting wire 10W are arranged in this order in the circumferential direction.

  FIG. 6 is a perspective view of the crank portion where the conducting wire bends as seen from the direction indicated by the arrow VI in FIG. FIG. 7 is a cross-sectional view showing the arrangement of the conductive wires in the crank portion along the line VII-VII in FIG. With reference to FIG. 6 and FIG. 7, in the crank part 12, the conducting wire 10 is arrange | positioned at zigzag form, and each corner | angular part is cut off. That is, it has an edge portion 10E having an angular shape and a circular portion 10R whose corner is dropped, and it is possible to ensure insulation between the adjacent conductors 10 in the circular portion 10R.

  That is, it is possible to avoid contact between the ridge lines by configuring the conducting wire 10 in a D shape in a cross section orthogonal to the longitudinal direction in the crank portion.

  FIG. 8 is a diagram showing a wiring structure for driving the rotating electrical machine provided in the stator. Referring to FIG. 8, a plurality of wirings 115 and 116 are provided on stator core 110. Each of the divided stator cores 110 has teeth 111, and slots 112 are formed between the teeth 111. A coil is wound around the slot 112. A wiring 115 for connecting each coil is provided on the stator core 110. A wiring 116 as a power line is provided, and the coil is connected to the outside in the wiring 116 corresponding to the U phase, the V phase, and the W phase.

  FIG. 9 is a cross-sectional view showing a conducting wire that fits into one slot along the line IX-IX in FIG. As shown in FIG. 9, a conducting wire 10 constituted by a rectangular wire having a substantially rectangular cross section perpendicular to the longitudinal direction is fitted in the slot 112 of the stator core 110. If the cross-sectional shape of the conducting wire 10 as the coil wire in the slot 112 is the same as that of the crank portion, the space factor will be reduced, which will hinder downsizing and higher output of the rotating electrical machine. In order to arrange the conducting wires in FIG. 9, a shape as shown in FIG. 9 is adopted.

  That is, according to the present invention as described above, the stator 150 is connected to the plurality of coil portions 11 that are accommodated in the plurality of slots 112 of the stator core 110 to form the coil 13, and the stator core 110 is connected to the stator core 110. A conductor 10 having a crank portion 12 that extends in the circumferential direction and bends in the radial direction is provided. The conducting wire 10 is covered with an insulating film 18. In the coil part 11, the cross section orthogonal to the longitudinal direction of the conducting wire 10 is rectangular. In the crank portion 12, corners in a cross section perpendicular to the longitudinal direction of the conducting wire 10 are cut off at a portion close to other conducting wires. And the cross-sectional shape orthogonal to the longitudinal direction of the conducting wire in the crank part 12 is D shape. The stator core 110 has teeth 111 inserted into the coil 13. In the cross section shown in FIG. 5 along the radial direction of the slot of stator core 110, U-phase conductor 10U as the first-phase conductor is fitted in the slot, and V-phase as the second-phase conductor is outside the slot. A conducting wire 10V is located.

  That is, in contrast to the conventional problem that the ridges of the flat wires come into contact with each other and the coating comes off when it vibrates, the invention according to the embodiment suppresses peeling of the insulating film 18 by cutting off the corners of a part of the conducting wire. ing.

(Embodiment 2)
FIG. 10 is a cross-sectional view showing the arrangement of conductive wires according to one aspect of the second embodiment of the present invention. FIG. 11 is a cross-sectional view showing the arrangement of conductive wires according to another aspect of the second embodiment of the present invention. In the second embodiment, as shown in FIGS. 10 and 11, a configuration other than the D shape is employed. Specifically, FIG. 10 employs a configuration in which corner portions are chamfered. On the other hand, in FIG. 11, the cross section is circular.

  FIG. 12 is a diagram showing a winding structure in a stator according to a comparative example. In FIG. 12, the cross section of all the conducting wires 10 is a rectangle. Therefore, contact between the ridge lines is avoided by providing a gap 17 between the uppermost conductor and the conductor below it.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  The present invention can be used in the field of rotating electrical machines.

  10 conducting wire, 10U U phase conducting wire, 10V V phase conducting wire, 10W W phase conducting wire, 11 coil part, 12 crank part, 13 coil, 17 gap, 18 insulating film, 100 rotating electrical machine, 110 stator core, 111 teeth, 112 slot, 115 116, wiring, 130 shaft, 140 rotor, 150 stator.

Claims (5)

A plurality of coil portions that are housed in each of a plurality of slots of the stator core to form a coil, and a crank portion that connects the plurality of coil portions and extends in the circumferential direction of the stator core and bends in the radial direction. With conductors,
The conducting wire is covered with an insulating film,
In the coil part, the cross section perpendicular to the longitudinal direction of the conducting wire is rectangular,
In the crank portion, a corner of a cross section perpendicular to the longitudinal direction of the conducting wire is cut off at a portion adjacent to another conducting wire.   The stator according to claim 1, wherein a cross-sectional shape perpendicular to the longitudinal direction of the conducting wire in the crank portion is a D shape.   The stator according to claim 1, further comprising a stator core having teeth inserted into the coil.   4. The stator according to claim 3, wherein a first phase conductor is fitted in the slot and a second phase conductor is located outside the slot in a cross section along the radial direction of the slot of the stator core. 5. The stator according to any one of claims 1 to 4,
A rotating electrical machine comprising a rotor positioned on an inner peripheral side of the stator.

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