JP5609937B2 - Rotating electric machine stator - Google Patents

Description

  The present invention relates to a stator of a rotating electrical machine that regulates a positional shift between a stator core and a stator winding.

  In recent years, rotating electric machines used as electric motors and generators are 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. There is also a need for improved reliability.

  Patent Documents 1 and 2 disclose a rotating electrical machine in which an insulating spacer (fixing member) is installed between a stator core and a stator winding.

  In recent years, a stator core of a rotating electrical machine in which a plurality of divided cores are arranged in the circumferential direction has been used. In the stator core using this divided core, the insulating spacers are inserted at least on both sides in the circumferential direction across the circumferential contact portion (contact surface) of the divided core. As a specific example of this insulating spacer, as shown in FIG. 15, a substantially U-shaped insulating spacer sandwiching the stator winding can be cited.

  The stator core is formed by combining a large number of divided cores, and a large number of insulating spacers are required to form a stator of one rotating electrical machine. As a result, there is a problem that the cost due to the number and assembly of the insulating spacers increases. Specifically, in the case illustrated in FIG. 15, the insulating spacer is assembled in a state of straddling the circumferential contact portion (contact surface) of the split core. For this reason, the number of insulating spacers is the same as the number of contact portions in the circumferential direction of the split core.

  Furthermore, the conventional insulating spacer is only inserted between the stator core and the stator winding, and is not supported by both of them. For this reason, there is a possibility that the insulating spacer is displaced or dropped due to vibration, heat, mechanical stress or the like when the rotating electric machine is used. When the insulating spacer is removed, the stator winding and the stator core come into contact with each other, and the winding is damaged due to a decrease in the insulation performance of the stator winding constituting the stator winding and stress such as vibration. There is a possibility that the reliability of the rotating electrical machine is lowered.

JP 2000-166158 A JP 2006-33918 A

  This invention is made | formed in view of the said actual condition, and makes it a subject to provide the stator of the rotary electric machine by which the relative displacement | transformation of the stator winding | coil of a rotary electric machine and a stator core was suppressed.

  In order to solve the above-mentioned problem, the present inventor has made studies and found that the above-mentioned problem can be solved by providing a protrusion on the end face of the stator core facing the stator winding.

  That is, the stator of the rotating electrical machine according to the first aspect of the present invention includes a stator core having a plurality of slots in the circumferential direction, a slot accommodating portion accommodated in different circumferential slots, and a slot outside the slot. And a stator winding formed by winding a plurality of conducting wires having a turn portion connecting the housing portions around the stator core in a wave shape along the circumferential direction. The stator core has a protrusion that protrudes from the axial end face in the direction of the turn of the stator winding and restricts the transition of the stator winding and the stator core. The stator core is interposed between the stator winding and the stator winding.

  In the stator of the rotating electrical machine of the present invention, the stator core itself has a protrusion that restricts the transition of the stator winding and the stator core, so that a problem such as dropping of a conventional insulating spacer does not occur. As a result, even if vibration, heat, mechanical stress, or the like is applied to the rotating electrical machine using the stator of the rotating electrical machine of the present invention, damage to the stator windings can be suppressed, and deterioration of the performance of the rotating electrical machine can be suppressed. Furthermore, since the protrusion is formed on the stator core itself, the number of parts can be reduced and the cost required for assembly can be reduced.

In the stator of the rotating electrical machine according to the first aspect of the present invention, the stator core is formed by laminating a plurality of plate-like members, and the protrusion is formed only on the plate-like member forming the axial end surface. It is characterized by being. The stator of the rotating electrical machine according to the first aspect of the present invention can easily form a stator core having a protrusion by forming a protrusion only on a plate-like member that forms an end face in the axial direction. can do. Here, the plate-like member that forms the end face in the axial direction on which the protrusion is formed may be either the same material as the metal that forms the stator core or a different material.

The stator of the rotating electrical machine according to the second aspect of the present invention is characterized in that the stator core is formed by laminating a plurality of metal plates. The stator of the rotating electrical machine according to claim 2 , wherein the stator core is formed by laminating a plurality of metal plates, and is formed in the same manner as a stator core obtained by laminating conventionally known metal plates. be able to.

The stator of the rotating electrical machine according to the third aspect of the present invention is characterized in that the projecting portion is a ridge extending along the radial direction. The stator of the rotating electrical machine according to the third aspect of the present invention is such that the protrusion is formed of a protrusion extending in the radial direction, and the protrusion is interposed in the radial direction to change the stator winding and the stator core. Can be regulated.

According to a fourth aspect of the present invention, the stator of the rotating electrical machine according to the present invention is characterized in that the protrusion is formed of a standing body that is raised along the radial direction. In the stator of the rotating electrical machine according to the fourth aspect of the present invention, the protrusions are formed of a standing body, so that the transition of the stator winding and the stator core can be restricted.

According to a fifth aspect of the stator of the rotating electrical machine of the present invention, the stator core includes a plurality of divided cores arranged in the circumferential direction. The stator of the rotating electrical machine according to the fifth aspect of the present invention can regulate the transition between the stator winding and the stator core even in the stator having the stator core formed by a plurality of divided cores. it can.

The stator of the rotating electrical machine of the present invention according to claim 6 is a stator core in which the thickness of the stator core provided with the protrusion is thicker than the thickness of the stator core without the protrusion. It is characterized by comprising. In the stator of the rotating electrical machine according to the sixth aspect of the present invention, since the thickness of the stator core provided with the protrusion is thicker than the thickness of the stator core without the protrusion, the protrusion protrudes more. Thus, the protrusions can regulate the transition of the stator winding and the stator core. Here, the plate thickness of the stator core provided with the protrusions refers to the plate thickness of the plate-like member on which the protrusions are formed, or the split core on which the protrusions are formed when the stator core is formed of the split cores. Indicates the thickness.

The rotating electrical machine of the present invention according to claim 7 is characterized in that the projections restrict axial displacement of the stator winding.

It is sectional drawing which showed the structure of the rotary electric machine of 1st embodiment. It is the figure which showed the stator of the rotary electric machine of 1st embodiment. It is the figure which showed the structure of the stator core of the rotary electric machine of 1st embodiment. It is the figure which showed the split core which comprises the stator core of the rotary electric machine of 1st embodiment. It is the figure which showed the steel plate which comprises the end surface of the split core of the rotary electric machine of 1st embodiment. It is sectional drawing of the steel plate which comprises the end surface of the split core of the rotary electric machine of 1st embodiment. It is sectional drawing which shows the structure of each phase coil | winding which comprises the stator winding | coil of the rotary electric machine of 1st embodiment. It is the figure which showed the connection of the stator winding | coil of the rotary electric machine of 1st embodiment. It is the figure which showed the winding integration body of the rotary electric machine of 1st embodiment. It is the figure which showed the wound body which wound the winding integration body of the rotary electric machine of 1st embodiment. It is the figure which showed the steel plate which comprises the end surface of the split core of the rotary electric machine of 2nd embodiment. It is sectional drawing of the steel plate which comprises the end surface of the split core of the rotary electric machine of 2nd embodiment. It is the figure which showed the steel plate which comprises the end surface of the split core of the rotary electric machine of 3rd embodiment. It is sectional drawing of the steel plate which comprises the end surface of the split core of the rotary electric machine of 3rd embodiment. It is the figure which showed the conventional fixing member.

  Hereinafter, a stator and a rotating electrical machine of a rotating electrical machine according to the present invention will be described more specifically using embodiments.

(First embodiment)
The configuration of the rotating electrical machine of this embodiment is shown in FIG. The rotating electrical machine 1 according to the present embodiment includes a housing 10 in which a pair of substantially bottomed cylindrical housing members 100 and 101 are joined to each other through an opening, and is rotatably supported by the housing 10 via bearings 110 and 111. And a stator 3 fixed to the housing 10 at a position surrounding the rotor 2 inside the housing 10.

  The rotor 2 is formed with a plurality of magnetic poles that are alternately different in the circumferential direction by permanent magnets on the outer peripheral side facing the inner peripheral side of the stator 3. The number of magnetic poles of the rotor 2 is not limited because it varies depending on the rotating electric machine. In this embodiment, an 8-pole rotor (N pole: 4, S pole: 4) is used.

  As shown in FIG. 2, the stator 3 includes a stator core 30, a three-phase stator winding 4 formed from a plurality of phase windings, a stator core 30, and a stator winding 4. And an insulating paper 5 disposed between the two.

  As shown in FIG. 3, the stator core 30 has an annular shape in which a plurality of slots 31 are formed on the inner periphery. The plurality of slots 31 are formed such that the depth direction thereof coincides with the radial direction. The number of slots 31 formed in the stator core 30 is formed at a ratio of two per one phase of the stator winding 4 with respect to the number of magnetic poles of the rotor 2. That is, 8 × 3 × 2 = 48 slots 31 are formed.

  The stator core 30 is formed by arranging 24 divided cores 32 shown in FIG. 4 in the circumferential direction. The split core 32 defines one slot 31 and one slot between the circumferentially adjacent split cores 32 (a tooth portion 320 extending radially inward and a tooth portion 320 are formed. The back core portion 321) is formed.

  The stator core 30 (the divided core 32 constituting the stator core 30) is formed by laminating 410 electromagnetic steel sheets having a thickness of 0.3 mm. An insulating thin film is disposed between the laminated electrical steel sheets. The stator core 30 may be formed not only from the laminated body of electromagnetic steel sheets but also using conventionally known metal thin plates and insulating thin films.

  The stator core 30 (the divided core 32 constituting the stator core) is formed with a protrusion 322 (corresponding to the protrusion of claim 1) protruding from the surface thereof. The protrusion 322 is formed in a shape extending along the teeth portion 320. Further, as shown in FIGS. 5 to 6, the protrusion 322 is formed so that the cross section in the circumferential direction and the radial direction has a substantially semi-cylindrical shape. 5 shows a steel plate 32A, FIG. 6A shows a cross section taken along line II in FIG. 5, and FIG. 6B shows a cross section taken along line II-II in FIG. . The ridge 322 is formed by bending a steel plate 32A located on both end surfaces in the thickness direction among the steel plates constituting the stator core 30 (the divided core 32 constituting the stator core 30).

  As shown in FIG. 4, the stator 3 includes protrusions 322 on the end face of the stator core 30, and when the stator 3 is formed, the protrusions 322 form the stator core 30 and the stator windings. 4 (turn part 45). Thereby, the transition between the stator core 30 and the stator winding 4 is restricted. Here, in FIG. 4, the protrusions 322 can be confirmed only on one end face side, but similar protrusions are also formed on the other end face side.

  The stator winding 4 is formed by winding a plurality of windings 40 by a predetermined winding method. As shown in FIG. 7A, the winding 40 constituting the stator winding 4 includes a copper conductor 41 and an insulating film comprising an inner layer 420 and an outer layer 421 covering the outer periphery of the conductor 41 and insulating the conductor 41. 42. The thickness of the insulating film 42 including the inner layer 420 and the outer layer 421 is set between 100 μm and 200 μm. Thus, since the thickness of the insulating film 42 composed of the inner layer 420 and the outer layer 421 is thick, it is not necessary to insulate the windings 40 with insulating paper or the like between them. Insulating paper may be disposed between the stator cores 30 to insulate the wires from each other.

  The outer layer 421 is formed of an insulating material such as nylon, and the inner layer 420 is formed of an insulating material such as a thermoplastic resin or a polyamideimide having a glass transition temperature higher than that of the outer layer. As a result, the outer layer 421 is softened faster than the inner layer 420 due to heat generated in the rotating electrical machine, so that the windings 40 installed in the same slot 31 are thermally bonded to each other. As a result, the plurality of windings 40 installed in the same slot 31 are integrated to make the windings 40 rigid, so that the mechanical strength of the wire winding 40 in the slot 31 is improved. In addition, even if excessive vibration occurs, the bonding portion between the inner layer 420 and the outer layer 421 is peeled off before the bonding portion between the inner layer 420 and the conductor 41. Therefore, the adhesion between the inner layer 420 and the conductor 41 is maintained and insulation is maintained. It can be secured.

  Further, as shown in FIG. 7B, the winding 40 of the stator winding 4 is formed by covering the outer periphery of the insulating film 42 made of the inner layer 420 and the outer layer 421 with a fusion material 43 made of epoxy resin or the like. Also good. As a result, the fusion material 43 is melted faster than the insulating film 42 by the heat generated in the rotating electrical machine, so that the plurality of windings 40 installed in the same slot 31 are thermally bonded by the fusion material 43. As a result, the plurality of windings 40 installed in the same slot 31 are integrated to make the windings 40 rigid, so that the mechanical strength of the winding 40 in the slot 31 is improved.

  A coating made of polyphenylene sulfide (PPS) may be used for the insulating coating 42 of the winding 40 constituting the stator winding 4.

  The stator winding 4 is formed by two three-phase windings (U1, U2, V1, V2, W1, W2), respectively, as shown in FIG.

  The stator winding 4 is formed by winding a winding assembly 46 (FIG. 9) formed in a strip shape by stacking twelve windings 40 formed in a predetermined waveform shape in a predetermined state into a cylindrical shape. (FIG. 10). In the present embodiment, the winding integrated body 46 is wound six times.

  The stator winding 4 includes a linear slot accommodating portion 44 accommodated in a slot 31 formed in the stator core 30 and a turn portion 45 that connects adjacent slot accommodating portions 44 to each other. . The slot accommodating portions 44 are accommodated in the slots 31 for each predetermined number of slots (3 phases × 2 = 6 in the present embodiment). The turn portion 45 is formed so as to protrude from the end surface of the stator core 30 in the axial direction.

  The stator winding 4 is formed by winding a plurality of windings 40 in a wavy shape along the circumferential direction with one end protruding from the axial end surface of the stator core 30. . The winding 40 of the stator winding 4 is wound from the radially outer side toward the radially inner side. The end of the winding 40 protrudes from the end surface of the stator winding 4 on the innermost peripheral surface side.

  Note that the winding method of the winding 40 of the stator winding 4 is not particularly limited, and one phase of the stator winding 4 is wavy along the circumferential direction and wound in different winding directions. It is good also as a structure connected by the folding | turning part which the winding direction reverses two mounted | worn windings.

  In the present embodiment, the protrusion 322 formed on the end face of the stator core 30 is interposed between the stator winding 4 and the stator core 30, and the transition between the stator winding 4 and the stator core 30 is changed. Be regulated. And in this embodiment, the protrusion 322 is formed in stator core 30 itself, and the malfunction of dropping of the conventional insulation spacer does not generate | occur | produce. As a result, even if vibration, heat, mechanical stress, or the like is applied to the rotating electrical machine 1 using the stator 3 of the rotating electrical machine of this embodiment, damage to the stator winding 4 is suppressed, and the performance of the rotating electrical machine 1 is improved. Reduction is suppressed. Furthermore, since the protrusions 322 are formed on the stator core 30 itself, the number of parts can be reduced and the cost required for assembly can be reduced.

  Further, in the present embodiment, a stator or the like is applied to the turn portion 45 of the stator winding 4 protruding from the end face of the stator core 30 of the stator 3 in the rotating electrical machine 1 by a device (not shown). 3 cooling can be performed. In the present embodiment, the refrigerant that has flowed from the turn portion 45 of the stator winding 4 to the end face of the stator core 30 flows inward in the radial direction along the protrusion 322. As a result, the inside of the turn portion 45 of the stator winding 4 in the thickness direction is cooled by the refrigerant. That is, this embodiment is also excellent in cooling performance.

(Second embodiment)
This embodiment is a fixing member similar to the first embodiment except that a standing body 323 is formed instead of the protrusion 322.

  As shown in FIGS. 11 to 12, the standing body 323 is a tooth portion of the steel plate 32 </ b> A located on both end surfaces in the thickness direction among the steel plates constituting the stator core 30 (the divided core 32 constituting the stator core 30). A substantially U-shaped cut is made at 320 and is formed. 11 shows a steel plate 32A, FIG. 12A shows a cross section taken along line III-III in FIG. 11, and FIG. 12B shows a cross section taken along line IV-IV in FIG. .

  Also in this embodiment, since the standing body 323 functions similarly to the protrusion 322 of the first embodiment, the same effect as that of the first embodiment can be exhibited.

(Third embodiment)
This embodiment is a fixing member similar to the first embodiment except that a standing body 324 is formed instead of the protrusion 322.

  As shown in FIGS. 13 to 14, the standing body 323 is a tooth portion of the steel plate 32 </ b> A located on both end surfaces in the thickness direction among the steel plates constituting the stator core 30 (the divided core 32 constituting the stator core 30). Two slits extending parallel to the radial direction are made in 320, and the sandwiched portion is raised. 13 shows a steel plate 32A, FIG. 14A shows a cross section taken along line VV in FIG. 13, and FIG. 14B shows a cross section taken along line VI-VI in FIG. .

  Also in this embodiment, since the standing body 324 functions similarly to the protrusion 322 of 1st embodiment, the effect similar to 1st embodiment can be exhibited.

1: Rotating electrical machine 10: Housing 110, 111: Bearing 2: Rotor 20: Rotating shaft 3: Stator 30: Stator core 31: Slot 32: Split core 320: Teeth section 4: Stator winding 40: Winding 41: Conductor 42: Insulating film 43: Fusing material 44: Slot accommodating portion

Claims (7)

A stator core having a plurality of slots in the circumferential direction;
A plurality of conducting wires having a slot accommodating portion accommodated in the slots having different circumferential directions and a turn portion connecting the slot accommodating portions to each other outside the slot are provided in the stator core along the circumferential direction. A stator winding wound in a wave shape;
A stator of a rotating electric machine with
The stator core is formed by laminating a plurality of plate-like members , and a transition between the stator winding and the stator core that protrudes from the end face in the axial direction toward the turn portion of the stator winding. The protrusion is formed only on the plate-like member that forms an end face in the axial direction, and is interposed between the stator core and the stator winding. A stator of a rotating electric machine characterized by The stator of a rotating electrical machine according to claim 1 , wherein the stator core is formed by laminating a plurality of metal plates. The protrusions stator according to any one of claims 1-2 consisting of ridges extending along the radial direction. The protrusions stator according to any one of claims 1-2 consisting standing設体caused along the radial direction. The stator of a rotating electrical machine according to any one of claims 1 to 4 , wherein the stator core includes a plurality of divided cores arranged in a circumferential direction. Wherein among the stator core, the plate thickness of the stator core provided with said protrusions, according to any one of claims 1 to 5 made of thicker stator core than the thickness of the stator core without the protrusion Stator for rotating electric machine. The stator of the rotating electrical machine according to any one of claims 1 to 6 , wherein the protrusions restrict axial displacement of the stator windings.

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