JP5057144B2 - Rotating electric machine stator - Google Patents

Description

  The present invention relates to a stator of a rotating electrical machine.

  In recent years, rotating electric machines used as electric motors and generators have been required to be small and have high output and improved quality.

  For example, in a rotating electrical machine mounted on a vehicle, a space for mounting the rotating electrical machine in an engine room of the vehicle is becoming smaller, and an improvement in power generation output due to an increase in vehicle load is required.

  Moreover, the rotating electrical machine mounted on the vehicle is constantly generating electricity and generating Joule heat as an output current. Due to the large amount of heat generated by Joule heat, the exposed thermal environment is severe, and the rotating electrical machine is required to have extremely high heat resistance.

  In particular, for small and high output of rotating electrical machines, the winding resistance value of the stator winding is reduced, the space factor of the electric conductor contained in the magnetic circuit of the stator is improved, and the turn portion of the stator winding is further improved. In addition to this, alignment and densification are required, and in addition to this, it is necessary to meet the above-mentioned requirements such as heat resistance environment.

  As such a rotary electric machine, it is disclosed by patent documents 1-2, for example.

  Patent Document 1 discloses a stator of a rotating electrical machine in which a turn portion and a joint portion of a conductor segment are arranged adjacent to each other and a step is provided in the axial height.

  However, when the turn part is higher than the joint part, there is a problem that the film of the turn part is damaged by heat and sputtering during welding, resulting in poor insulation. In addition, the joints are at both ends of the core and must be covered with an insulating resin for insulation, which deteriorates heat dissipation of the coil and causes a temperature rise.

  Patent Document 2 discloses a rotating electrical machine having a stator in which the protruding height of a coil from a stator core gradually decreases toward the outside in the radial direction.

However, when the coil having such a configuration is formed by a continuous winding, a large number of connecting wires for connecting to an external circuit are provided on the inner diameter side. When the crossover wire arranged on the inner diameter side is turned around, the coils overlap each other, and there is a problem that the protruding height of the coil on the inner diameter side is locally increased and the overall physique becomes coarse.
JP 2002-78269 A Japanese Patent No. 3621635

  This invention is made | formed in view of the said actual condition, and makes it a subject to provide the stator which does not produce the fall of performance, when the coarsening of a physique is suppressed and it is used for a rotary electric machine.

  In order to solve the above-mentioned problems, the present inventor has studied the stator of a rotating electric machine, and as a result, has reached the present invention.

That is, the stator of the rotating electrical machine according to the present invention includes a stator core having a plurality of slots in the circumferential direction and a coil continuously formed by multiphase stator windings installed in the slots. In the stator of the electric machine, the stator winding has a slot accommodating portion installed in a slot having different circumferential directions, and a turn portion connecting the slot accommodating portions to each other outside the slot, and the coil is A plurality of turn portions are formed side by side in the radial direction, and at one end portion in the axial direction, the protruding height protruding from the stator core of the turn portion located at the innermost periphery is fixed to at least one other turn portion The end of the stator winding is arranged at a position that is lower than the protruding height of the turn part, which is formed lower than the protruding height protruding from the core, is in the direction of the protruding tip of the turn part located at the innermost periphery, and lower than the protruding height of the other turn parts. It is characterized by being installed That.

  The stator of the rotating electrical machine according to claim 2 of the present invention has a protrusion height protruding from the stator core of the turn portion located on the outermost periphery among the plurality of turn portions arranged in the radial direction. The other at least one turn part is formed in a direction lower than the projecting height at which the turn part located at the outermost periphery is formed lower than the projecting height projecting from the stator core, and at a position lower than the projecting height of the other turn part. The other end of the stator winding is disposed.

  The stator of the rotating electrical machine according to claim 3 of the present invention has a protrusion height protruding from the stator core of the turn portion located on the outermost periphery among the plurality of turn portions arranged in the radial direction. The other at least one turn part is formed so as to be higher than a protruding height protruding from the stator core.

A stator for a rotating electrical machine according to a fourth aspect of the present invention is the stator according to any one of the first or third aspect, wherein the protruding height protruding from the stator core of the plurality of turn portions arranged in the radial direction is the diameter of the coil. It is characterized by being formed so as to gradually increase from the inner side to the outer side.

  A stator for a rotating electrical machine according to a fifth aspect of the present invention is the stator according to any one of the first to fourth aspects, wherein the stator has a plurality of turn portions arranged in the radial direction on the other end side in the axial direction of the coil. It is characterized in that the protruding heights protruding from the core are not the same.

  A stator for a rotating electrical machine according to a sixth aspect of the present invention is the stator of the rotating electric machine according to any one of the third to fourth aspects, from a stator core of a turn portion located on an outermost periphery among a plurality of turn portions arranged in the radial direction. The end of the stator winding is disposed at a position lower than the protruding height.

  In the stator of the rotating electrical machine according to the first aspect, the coil formed by the continuous stator winding is formed so that the turn portions are arranged in the radial direction. The innermost turn part is formed so that the protruding height from the stator core is low, and is outward of the protruding tip part and on the stator core side from the tip part of the other turn part. The end of the stator winding is disposed at the position. Due to the difference in the projecting heights of the multiple turn sections arranged in the radial direction, at least a part of the turn section is exposed, and heat can be dissipated in this section. Stator cooling is improved.

  In addition, when the end of the stator winding is disposed at the tip of the innermost turn part, the end does not protrude from the end of the coil in the axial direction, and the physique of the coil is prevented from becoming coarse. ing. Here, the end portion of the stator winding disposed at the tip of the innermost turn portion includes a jumper connecting the stator winding and a neutral point.

  Thus, the stator of the rotating electrical machine of the present invention can achieve cooling performance and downsizing, and can provide a rotating electrical machine with excellent performance.

  In the stator of the rotating electrical machine according to claim 2, the protruding height of the turn portion located on the outermost periphery is defined. This further improves the cooling performance of the stator.

  In the stator of the rotating electrical machine according to the third aspect, the protruding height of the turn portion located on the outermost periphery is defined. This further improves the cooling performance of the stator.

  The stator of the rotating electrical machine according to claim 4 has an end face shape defined on one end side of the coil. This further improves the cooling performance of the stator.

  In the stator of the rotating electrical machine according to claim 5, the end face shape of the coil on the other end side is defined. This further improves the cooling performance of the stator.

  The stator of the rotating electrical machine according to claim 6 has a defined end face shape on one end side of the coil. This further improves the cooling performance of the stator.

  Hereinafter, the stator of the rotating electrical machine according to the present invention will be described more specifically with reference to embodiments.

(First embodiment)
The configuration of a rotating electrical machine using the stator of the rotating electrical machine of the present embodiment is shown in FIG. The rotating electrical machine includes a substantially cylindrical stator 1 and a rotor 2 rotatably accommodated in an axial center portion of the stator 1.

  As shown in FIG. 1, the rotor 2 has a configuration in which permanent magnets are arranged so that different magnetic poles are positioned alternately in the circumferential direction on the outer circumferential surface in the radial direction. The rotor 2 is formed with the magnetic poles on the outer peripheral surface facing the stator 1.

  2 to 4, the stator 1 includes a substantially cylindrical stator core 10 formed by laminating metal thin plates having a predetermined thickness in the thickness direction, and slots 11 of the stator core 10. 12 and a stator winding 3 installed in the inside.

  In the stator core 10, a plurality of sets of slots 11, 12 are formed in the circumferential direction on the inner peripheral side of the stator core 10, with a pair of slots 11, 12 extending in the axial direction and adjacent in the circumferential direction. Yes. The stator winding 3 is a three-phase winding, and the stator winding 3 for each phase is installed in a pair of slots 11 and 12 adjacent in the circumferential direction. The stator windings 3 of different phases are installed in the three-phase slots 11 and 12 adjacent to each other in the circumferential direction with the slots 11 and 12 as a set.

  The stator core 10 is formed by laminating a plurality of thin metal plates. An insulating thin film is disposed between the laminated metal thin plates. Here, the material and the thickness of the metal thin plate and the insulating thin film can be a conventionally known material and thickness.

  As shown in FIG. 5, the stator winding 3 is composed of a wire conductor 55 formed of a copper conductor 56 and an insulating film made up of an inner layer 57 and an outer layer 58 covering the outer periphery of the conductor 56 and insulating the conductor 56. . Since the insulating films 57 and 58 are sufficiently thick, insulation is ensured. In this embodiment, since the insulating films 57 and 58 are sufficiently thick, it is not necessary to sandwich an insulating paper or the like for insulating the wires 55 from each other, but insulating paper is used to insulate the wires 55 from each other. It may be arranged.

  The stator winding 3 is a continuous winding and is wound around the stator core 10, and includes a slot accommodating portion 30 accommodated in the slots 11 and 12 opened in the stator core 10, and the axial direction of the stator core 10. The turn part 31 which protruded from the end surface of is formed. The turn portions 31 are formed on both sides of the stator core 10 in the axial direction, and the turn portions 31 at both ends are formed so as to be symmetrical to each other.

  The turn part 31 is arranged in a state where a plurality of layers are arranged in the radial direction. And the turn part 31A located in the innermost periphery and the turn part 31B located in the outermost periphery are formed so that the protrusion height from the end surface of the stator core 10 is lower than the other turn parts 31C. And the protrusion height of turn part 31C other than turn part 31A, 31B located in the innermost periphery and the outermost periphery was the same height.

  Then, the connecting wire 32 of the stator winding 3 is wound around at the tip of the protruding end portion of the innermost turn portion 31A. Further, the connecting wire 32 of the stator winding 3 is turned around at the tip end of the projecting end portion of the outermost turn portion 31B, the neutral point 33 is connected, and the lead wire 34 is drawn outward in the radial direction. Yes.

  In the stator 1 of the rotating electrical machine of the present embodiment, the turn portions 31 are arranged in the radial direction of the coil formed by the continuous stator winding 3. And the protrusion height from the stator core 10 of the innermost turn part 31A and the outermost turn part 31B is formed to be lower than the other turn parts 31C. The connecting wire 32 of the stator winding 3 is wound around the protruding tip of the innermost turn portion 31A. Since the projecting height of the turn portions 31A and B is formed lower than that of the turn portion 31C, the tip portion of the turn portion 31C is exposed, and heat can be radiated in this portion, and the cooling performance of the stator 1 is improved. Improved.

  Further, the connecting wire 32 of the stator winding 3 is wound around at the tip end of the innermost turn portion 31A, and the neutral point 33 of the stator winding 3 is set at the tip end of the outermost turn portion 31B. Since the lead wires 34 are drawn radially outward from the outermost turn portions 31B and the connection and the crossover wires 32, the coarsening of the physique of the coil is suppressed.

  Thus, the stator 1 of the rotating electrical machine of the present embodiment can achieve cooling performance and downsizing, and exhibits an effect of providing a rotating electrical machine having excellent performance.

(Second embodiment)
This embodiment is a stator of a rotating electrical machine having the same configuration as that of the first embodiment except that the projecting height of the turn portion 31 of the stator 1 from the stator core 10 is different.

  The turn part 31 is arranged in a state where a plurality of layers are arranged in the radial direction. And the protrusion height from the end surface of the stator core 10 of the turn part 31A located in the innermost periphery is the lowest, and it is formed so that it may become high gradually as it progresses radially outward.

  Then, the connecting wire 32 of the stator winding 3 is wound around and the neutral point 33 is connected at a position lower than the tip of the protruding end portion of the innermost turn portion 31A or the outermost turn portion 31B. Yes. A lead wire 34 is drawn out radially outward from the outermost turn portion 31B.

  As in the case of the first embodiment, the stator 1 of the rotating electrical machine of the present embodiment has the stator winding 3 connected at a position lower than the tip of the innermost turn part 31A or the outermost turn part 31B. At the same time, the lead wire 34 is drawn radially outward from the outermost turn portion 31B, thereby suppressing the coarsening of the physique of the coil.

  Furthermore, since the projecting heights of the turn parts 31 arranged in the radial direction are formed to be inclined, it is possible to dissipate heat at the projecting tip parts of the respective turn parts 31 and the cooling performance of the stator 1 is improved. .

  Thus, also in the present embodiment, as in the case of the first embodiment, it is possible to achieve cooling performance and downsizing, and the effect of providing a rotating electrical machine with excellent performance is exhibited.

It is the figure which showed the structure of the rotary electric machine of 1st embodiment. It is a perspective view of the stator of the rotary electric machine of a first embodiment. It is a side view of the stator of the rotary electric machine of the first embodiment. It is sectional drawing in the axial direction of the stator of the rotary electric machine of 1st embodiment. It is sectional drawing which showed the structure of the stator winding | coil of 1st embodiment. It is sectional drawing in the axial direction of the stator of the rotary electric machine of 2nd embodiment.

Explanation of symbols

1: Stator 10: Stator core 11, 12: Slot 2: Rotor 3: Stator winding 30: Slot accommodation part 31: Turn part 32: Crossover wire 33: Neutral point 34: Lead wire 55: Wire rod 56: Conductor 57, 58: Insulating film

Claims (6)

In a stator of a rotating electrical machine, comprising: a stator core having a plurality of slots in the circumferential direction; and a coil continuously formed by multiphase stator windings installed in the slots. Has a slot accommodating portion installed in the slot having a different circumferential direction, and a turn portion connecting the slot accommodating portions to each other outside the slot, and the coil has the turn in the radial direction. A plurality of portions are formed side by side, and at one end side in the axial direction, the projecting height of the turn portion located at the innermost periphery protruding from the stator core is at least one other turn portion is the stator core The end of the stator winding is formed at a position lower than the projecting height of the other turn part, which is lower than the projecting height of the other turn part. Rotating electricity characterized by being arranged Stator of.   Among the plurality of turn parts arranged in the radial direction, the protrusion height protruding from the stator core of the turn part located at the outermost periphery is higher than the protrusion height at which at least one other turn part protrudes from the stator core. The other end portion of the stator winding is disposed at a position that is lower than the protruding height of the other turn portion and that is in the direction of the protruding tip of the turn portion that is formed at the outermost periphery. The stator of the rotating electrical machine according to Item 1.   Among the plurality of turn parts arranged in the radial direction, the projecting height of the turn part located on the outermost periphery is greater than the projecting height of at least one other turn part projecting from the stator core. The stator of the rotary electric machine according to claim 1, which is formed highest. Protrusion height protruding from a plurality of the stator core of the turn portions aligned in the radial direction, the claims are formed to be gradually higher outwardly from the radially inward of the coil 1 or The stator of the rotating electrical machine according to 3.   The axial direction of the other end part of the said coil is formed so that the protrusion height which protruded from the said stator core of the said several turn part located in a line with the radial direction may not be the same. A stator for a rotating electric machine according to claim 1.   An end portion of the stator winding is disposed at a position lower than a protruding height at which the turn portion located on the outermost periphery of the plurality of turn portions arranged in the radial direction protrudes from the stator core. Item 5. A stator for a rotating electrical machine according to any one of Items 3 to 4.