JP2014225968A - Stator of rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stator of a rotary electric machine capable of securing a space factor of a coil without breaking the coil.SOLUTION: A stator 60 of a rotary electric machine comprises coils 66 respectively laminated on plural teeth 63 projecting toward an inner periphery of a yoke 62 so that conductors 65 have asymmetrical cross sectional shapes on both sides in a circumferential direction. The coil 66 is wound like a straw bag like manner, and a cross point of the conductors 65 by feeding and returning is arranged on a coil end 63c side. The conductor 65 in a 21st turn wound on an innermost side in a third layer is wound and fixed to the conductors 65 in the 22 other turns on the coil end 63c side. The coil 66 laminated in an asymmetrical cross sectional shape on both side faces in the circumferential direction is wound around the teeth 63, so as to obtain a stator with a high space factor of the coil 66, prevent breakage of the wound conductors 65, and maintain a stable coil winding state.

Description

  The present invention relates to a stator of a rotating electrical machine such as a motor or a generator, and more particularly to a stator of a rotating electrical machine in which a plurality of teeth around which a coil is wound are annularly arranged.

  For example, a rotating electrical machine such as a motor mounted as a driving source of a vehicle has a rotor provided on a rotating main shaft that is rotatably supported by a housing, and a stator disposed outside the rotor. The stator segment, which is a split core, is arranged in a circle in the housing. Each stator segment is formed in a substantially T-shape having a yoke extending in the circumferential direction and teeth projecting from the yoke in the inner diameter direction. A bobbin-shaped insulator is attached to the teeth of each stator segment, and a coil is wound around the teeth via the insulator.

  In this type of stator, it is desired to increase the number of turns of the coil wound around the teeth of each stator segment and increase the coil space factor in the slot. On the other hand, in order to improve the efficiency of the rotating electrical machine, a conductor having a large diameter tends to be used as a conductor constituting the coil.

  For example, as shown in the cross-section of the main part in FIG. 13, the insulator 106 is interposed in the teeth 103 of each stator segment 101, and the coils 106 are aligned so as to have the same cross-sectional shape on both sides 103 a and 103 b in the circumferential direction of the teeth 103. In the case of winding in a saddle shape, the conductor 105 is wound as a first layer without any gaps from the base end side on the yoke 102 side, and is sent to the inner end flange 103c side by side by winding for 8 turns in sequence. The second layer is aligned and wound back by 7 turns from 8 turns to 15 turns without any gap from the 7th turn to the 8th turn of the first layer to the base end side, and from between the yoke 102 and 15 turns as the third layer. The inner end of the ridge 103c is sequentially wound and fed in order of 7 turns from 16 turns to 22 turns without any gap, and the fourth layer is sequentially turned from 20 turns and 19 turns to the base end side in order. As soon as it is aligned and wound back for 4 turns from 23 turns to 26 turns, and as the 5th layer, it is wound in turn for 2 turns of 27 turns and 28 turns in order from the inside of the yoke 102 and 26 turns to the inner end side. The lead wire 105 of the turn interferes with the 28th turn of the coil 106 wound around the teeth 102 of the adjacent stator segment 101 and cannot be wound. That is, in practice, the fifth layer can only be wound up to the 27th turn, and a large space is formed between the adjacent teeth 103, that is, in the slot. In addition, the number attached | subjected to the conducting wire 105 has shown the turn used as winding order.

  Thus, when the coil is wound in the same cross-sectional shape, that is, a symmetrical cross-sectional shape on both sides in the circumferential direction of the teeth, the coils wound around the adjacent teeth interfere with each other and the number of turns is limited, and the coil in the slot The space factor decreases.

  It is desired to increase the coil space factor in the slot by increasing the number of turns of the coils wound around the teeth of this type, and various techniques have been proposed.

  For example, in Patent Documents 1 and 2, when a plurality of layers of coils are wound in a stacked manner, the coils wound around adjacent teeth do not interfere with each other so that cross sections are different on both sides in the circumferential direction of the teeth. Winding the conductor so that it is in shape. As a result, the conductive wires are alternately arranged so that the coils wound around the adjacent teeth do not interfere with each other, the number of coil turns is increased, and the coil can be increased in space.

JP 2003-333783 A JP 2006-353038 A

  According to Patent Documents 1 and 2 described above, the coil space factor is improved by winding the coil so as to have an asymmetric cross-sectional shape on both sides in the circumferential direction with respect to the teeth.

  However, since the coil is wound around the teeth in an asymmetric cross-sectional shape on both sides in the circumferential direction, a gap is formed between the conductive wires wound in a predetermined winding layer, and the coil is wound. In addition, there is a concern about the collapse of the already wound coil. In particular, when a gap is formed between the conductors on the innermost side of the winding layer, more coil collapse occurs, which hinders smooth coil winding work and affects the quality of the stator. Also, when a mold is placed on the inner periphery of the stator in which the stator segments are annularly arranged in the housing and the coils mounted on the teeth are resin-molded, the filling pressure of the mold resin that fills the gaps in the mold There is a concern that the coil wound by the breakage may occur.

  Accordingly, an object of the present invention made in view of such a point is to provide a high-quality stator of a rotating electrical machine that can secure a space factor of a coil and does not collapse a coil.

  The stator of the rotating electrical machine according to claim 1, which achieves the above object, includes a plurality of teeth having a rectangular cross-section formed on the inner peripheral surface side of the yoke so as to protrude in the inner diameter direction at intervals in the circumferential direction. Each of the teeth is wound by repeatedly winding the lead wire from the proximal end side to the inner end side in a spiral manner and repeatedly returning the lead wire from the inner end side to the proximal end side. In a stator of a rotating electrical machine having coils laminated so as to have an asymmetric cross-sectional shape on both side surfaces in the direction, the coils are wound in a stacked manner and the intersections of the conducting wires by the feeding and returning are arranged on the coil end side In addition, the conductive wire wound on the innermost side in the same layer is arranged so as not to be on the innermost side on the coil end side.

  According to this, by winding a coil laminated so as to have an asymmetric cross-sectional shape on both sides in the circumferential direction, a stator having a high coil space factor can be obtained and wound on the tooth. Arrangement is made so that the coil that is wound on the innermost layer in the same layer is not on the innermost side on the coil end side, so that the wound conductor is prevented from collapsing, and a stable coil winding state is maintained. it can.

  In addition, when the coil is wound or when the coil is resin-molded, the occurrence of coil collapse is prevented, and a high-quality stator without coil collapse is obtained.

  According to a second aspect of the present invention, in the stator of the rotating electric machine according to the first aspect, the conductive wire wound on the innermost side in the same layer is wound and fixed by another conductive wire wound on the coil end side. Features.

  According to this, the conducting wire wound on the innermost side which is the winding end is wound and fixed by the other winding conducting wire, and the occurrence of collapse of the conducting wire is prevented, and a stable high quality coil winding state is achieved. Can be maintained.

  According to the present invention, by winding a coil laminated on the teeth so as to have an asymmetric cross-sectional shape on both sides in the circumferential direction, a stator having a high coil space factor can be obtained and wound on the teeth. The coil that is wound on the innermost layer in the same layer is arranged so that it does not become the innermost on the coil end side, so that the wound conductor is prevented from being broken, and a stable coil winding state is achieved. Can be maintained.

It is principal part sectional drawing of the rotary electric machine in one Embodiment. It is the II section enlarged view of FIG. It is a perspective view of a stator segment. It is a perspective view of a coil assembly. It is the VV sectional view taken on the line of FIG. It is explanatory drawing which shows the process of winding conducting wire around the teeth. It is explanatory drawing which shows the process of winding conducting wire around the teeth. It is explanatory drawing which shows the process of winding conducting wire around the teeth. It is explanatory drawing which shows the process of winding conducting wire around the teeth. It is explanatory drawing which shows the process of winding conducting wire around the teeth. It is explanatory drawing which shows the process of winding conducting wire around the teeth. It is explanatory drawing which shows the process of winding conducting wire around the teeth. It is explanatory drawing of the coil winding of the stator in the conventional rotary electric machine.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a main part of a rotating electrical machine such as a motor and a generator according to an embodiment, and FIG.

  The rotating electrical machine 50 includes a cylindrical housing 51, and a rotating main shaft 52 is rotatably supported by a bearing (not shown) at a radial center portion of the housing 51. The rotation main shaft 52 is provided with a rotor 53, and the rotor 53 is provided with, for example, eight magnets 54. A substantially cylindrical stator 60 is provided on the inner surface 51 a of the housing 51 so as to cover the outer peripheral surface of the rotor 53.

  The stator 60 is formed by a stator segment 61 that is, for example, 12 divided cores. Each stator segment 61 is formed by laminating a substantially T-shaped steel sheet core sheet having an arcuate yoke piece extending in the circumferential direction and a tooth piece projecting in the inner diameter direction with respect to the yoke piece. .

  A stator segment 61 formed in a block shape by laminating a predetermined number of core sheets has an outer peripheral surface 62a and an inner peripheral surface 62b extending along the inner surface 51a of the housing 51, as shown in a perspective view in FIG. A yoke 62 extending in a circular arc shape in the circumferential direction, and a tooth that becomes a coil winding portion integrally formed with the yoke 62 protruding from the inner peripheral surface 62b toward the rotation main shaft 52 in the inner diameter direction with respect to the yoke 62. 63 and a substantially T-shape. A convex portion 62c is provided on one end surface in the circumferential direction of the yoke 62, and a concave portion 62d is formed on the other end surface.

  The teeth 63 projecting in the inner diameter direction from the yoke 62 are rectangular in cross section having circumferential side surfaces 63a, 63b and coil ends 63c, 63d, projecting in the inner diameter direction from the base end on the inner peripheral surface 62b side of the yoke 62, A flange 63e is formed on the inner end side.

  Further, as shown in FIG. 6 described later, a conducting wire insertion hole 62e penetrating the yoke 62 is formed adjacent to one side surface 63a of the tooth 63 from the outer peripheral surface 62a of the yoke 62. The stator 60 having twelve teeth 63 and slots is formed by fitting the convex portions 62c and the concave portions 62d of the respective stator segments 61.

  A bobbin-shaped resin insulator 64 is attached to the teeth 63 of the stator segment 61, and the lead wire 65 is wound around the outer periphery of the teeth 63 via the insulator 64 in a spiral manner and sent from the base end side to the inner end side. In addition, by repeatedly returning spirally to the inner end side in order to form a multi-layered coil 66, FIG. 4 shows a perspective view, and FIG. 5 shows a cross section taken along the line VV in FIG. A coil assembly 70 is formed.

  Winding for forming the coil 66 by winding the conductive wire 65 around the tooth 63 will be described with reference to FIGS. 5 and 6 to 12. In addition, the number attached | subjected to the conducting wire 65 in FIG. 5 has shown the turn used as winding order.

  First, as shown in FIG. 6, a conductive wire 65 that passes through the conductive wire insertion hole 62e formed in the yoke 62 of the stator segment 61 and the insulator 64 and is supplied in the vicinity of one side surface 63a of the teeth 63 is used as a first layer. Winding starts from the coil end 63c side toward the coil end 63d along the space between the inner peripheral surface 62b of the yoke 62 serving as the base end of the tooth 63 and one side surface 63a of the tooth 63, and passes through the coil end 63d side. The first turn is wound along the other side surface 63b toward the coil end 63c side, and further two turns are started along the coil end 63c, followed by two turns along the first turn. Similarly, the conductive wire 65 is wound in the order of 3, 4, 5, 6, 7 and 8 turns and sent to the inner end side 63e side. This first layer can feed the lead wire 65 stably by winding the lead wire 65 in a spiral form without any gaps in the order of one turn on the base end side of the teeth 63 to the innermost eight turns.

  Next, as shown in FIG. 7, the 9th turn of the second layer crosses the 8th turn conducting wire 65 on the coil end 63c from the end of the 8th turn on the inner end side which is the end of the first layer, that is, gets over. Winding is performed between 7 turns and 8 turns of the first layer on the side surface 63a side, and wound between 7 turns and 8 turns on the side surface 63b side from the coil end 63d. Similarly, 6th and 7th turn, 6th and 5th turn, 5th and 4th turn, 4th and 3rd turn, 3rd and 2nd turn, 2nd turn and 1st turn of the first layer on the side surface 63a side and side surface 63b side The conductors 65 of 10, 11, 12, 13, 14, and 15 turns are wound in order and returned to the proximal side. In the second layer, the conductive wire 65 is continuously wound around the adjacent turns of the first layer on the side surface 63a side and the side surface 63b side and spirally wound back from the inner end side to the base end side without a gap. This makes it possible to wind the conductive wire 65 stably.

  Next, as shown in FIG. 8, from the end of the 15th turn which is the end of the second layer, the 16th turn of the third layer is passed over the conductor 65 of the 15th turn on the coil end 63c, and the 15th on the side surface 63a side. Winding is performed between the turn and the inner peripheral surface 62 b of the yoke 62, and winding is performed between the coil turn 63 d and the 15 turns on the side surface 63 b side and the inner peripheral surface 62 b of the yoke 62. Similarly, on the side surface 63a side and side surface 63b side, 17, 18, 19, 20 along the 15th turn and 14th turn, 14th turn and 13th turn, 13th turn and 12th turn, 12th turn and 11th turn, respectively. The conducting wire 65 is aligned and wound on the inner end side in the turn order. From the 16th turn to the 20th turn of the third layer, the coil 65 is collapsed by winding the conductive wire 65 in alignment between the adjacent turns of the second layer from the yoke 62 side to the inner end side without a gap. The lead wire 65 is sent in a stable state.

  Next, as shown in FIG. 9, from the 11th turn and the 12th turn on the side surface 63b side which is the end of the 20th turn, as shown in FIG. 9, the 12th, 11th and 10th turn conductive wires 65 on the coil end 63c. Winding along the 9th turn and 10th turn, which is the innermost side of the third layer on the side surface 63a side, crossing, and between the 9th turn and 10th turn on the side surface 63b side from the coil end 63d side Wind along. The winding of 21 turns is held in a stable state with the conductive wire 65 disposed between the 9th turn and the 10th turn which is the innermost side of the third layer.

  Next, as shown in FIG. 10, 22 turns from the end of 21 turns intersect between the conductive wires 65 at 21 turns on the coil end 63c and between 10 turns and 11 turns of the two layers on the side surface 63a side, that is, It is sandwiched and wound between the 20th turn and the 21st turn of the third layer, and the conductive wire 65 at the 21st turn is wound and fixed on the coil end 63c, and the second layer 9 on the side surface 63b side from the coil end 63d side is fixed. Between the turn and the 10th turn, that is, between the 20th turn and the 21st turn of the three layers, it is wound.

  The 22-turn winding is arranged so that it is not the innermost side on the coil end 63c side of the 21-turn conductive wire 65 wound on the innermost side in the third layer that is the same layer, and the innermost side in the third layer. A 21-turn conductive wire 65 wound around the coil end 63c is wound and fixed by another 22-turn conductive wire 65, and the 21-turn conductive wire 65 is fastened and fixed on the second layer. Thus, coil winding is prevented and stable winding of the conductive wire 65 can be performed.

  Next, as shown in FIG. 11, the 23rd turn of the fourth layer intersects the 21 turn conductive wire 65 on the coil end 63c as shown in FIG. Winding so as to hold the conductive wire 65 in the turn and winding it between the 20th and 22nd turns of the third layer on the side surface 63a side, and conducting the conductive wire 65 in the 21st turn and the conductive wire 65 in the 22nd turn on the coil end 63c. Tighten and wind between 19 turns and 20 turns of the third layer from the coil end 63d side to the side face 63b side. This winding of 23 turns winds the conductive wire 65 on the coil end 63c, and the conductive wire 65 in the 21st turn and the conductive wire 65 in the 22nd turn are clamped on the second layer and securely fixed, and coil collapse is prevented. And stable winding of the conductive wire 65 can be performed.

  Next, as shown in FIG. 12, 24 turns are performed between 19 turns and 20 turns on the side face 63a side and 18 turns on the side face 63b side from between 19 turns and 20 turns on the side face 63b side which are the end of 23 turns. Wind between 19 and 19 turns. Similarly, 25 turns are wound between 18 turns and 19 turns on the side surface 63b side, 18 turns and 19 turns on the side surface 63b side, and 17 turns and 18 turns on the side surface 63b side. Is wound between 17 turns and 18 turns on the side surface 63b side, between 17 turns and 18 turns on the side surface 63a side and between 16 turns and 17 turns on the side surface 63b side, and 27 turns are wound on the side surface 63b. Winding is performed in a stable state between 16 turns and 17 turns on the side, between 16 turns and 17 turns on the side face 63a, and between 26 turns on the side face 63b side and the inner face 12b of the yoke 12. Further, 28 turns of the fifth layer are arranged between 26 on the side 63b side and the inner peripheral surface 12b of the yoke 12, 27 turns on the side 63a side, 26 turns and 25 turns on the inner peripheral surface 62b and side 63b side of the yoke 62. Wind along between. Then, the conducting wire 65 is cut and the winding of the coil 66 is finished.

  As shown in FIG. 5, the cross section of the wound coil 66 is asymmetrical with respect to the teeth 63 on both sides 63 a and 63 b in the circumferential direction. Specifically, the first layer, the second layer, and the third layer have symmetrical shapes of 8 turns, 7 turns, and 7 turns on the side surfaces 63a and 63b, respectively, but the fourth layer has 5 turns on the side surface 63a side, The side surface 63b side has four turns and is asymmetric on the side surface 63a side and 63b side. Similarly, the fifth layer is asymmetric on the side surface 63a side and the side surface 16b side with one turn on the side surface 63a side and two turns on the side surface 63b side.

  When the stator segment 61 in which the coil 65 is wound around the teeth 63 is assembled as the stator 60 in this way, as shown in FIG. 2, the coil 65 wound around the teeth 63 of the stator segment 61 on the left side of the figure is shown. 28 turns in the fifth layer on the side 63b side are formed by 27 turns, 28 turns in the fourth layer on the side 63a side of the coil 65 wound around the teeth 63 of the right stator segment 61, and 28 turns in the fifth layer. The third layer on the side surface 63b side of the coil 66 wound around the left tooth 63 is wound around the fifth tooth on the side surface 63a side of the coil 65. It penetrates into the empty area formed by 20 turns, 23 turns of the layer and 23 turns of the fourth layer.

  As described above, the coils 66 wound around the teeth 63 of the stator segments 61 can occupy the slots by effectively using the slots by mutually entering the empty areas of the coils 66 wound around the adjacent stator segments 61. The rate is improving. Further, adjacent coils 21 do not interfere with each other.

  Coil 66 wound around each tooth 63, in particular, 21 turns arranged so that the lead wire 65 in 21 turns that becomes the innermost winding end of the third layer on the coil end 63c of the tooth 63 does not become the innermost. The portion of the lead wire 65 is fixed by winding with the lead wire 65 in the other 22 turns, and the portion of the lead wire 65 in turns 21 and 22 is wound and fixed by the portion of the lead wire 65 in turn 23 to form the teeth 63. The collapse of the coil 66 wound around is prevented, and a stable winding state of the coil 66 can be maintained.

  As a result, when the molds are arranged on the inner periphery of the stator 60 formed by annularly arranging the stator segments 61 in the housing 51 and the coils 65 attached to the teeth 63 are resin-molded, the molds are filled. Even if the filling pressure of the mold resin to be applied is applied to the wound coil 65, the coil 65 does not collapse and a desired resin mold can be applied, and a high-quality rotating electrical machine stator without coil collapse is obtained. .

  In addition, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the meaning of invention. For example, in the above-described embodiment, the case where the coil is wound around the teeth in five layers is described as an example. However, the coil is not limited to five layers, but can be wound around other plural layers. In addition, a resin mold can be applied to the coils in the state of a coil assembly in which the coils 66 are wound around the teeth 63 of the stator segments 61.

50 Rotating electrical machine 51 Housing 52 Rotating spindle 60 Stator 61 Stator segment 62 Yoke 63 Teeth 63a, 63b Side surface 63c, 63d Coil end 63e 鍔 64 Insulator 65 Conducting wire 66 Coil

Claims (2)

On each of a plurality of teeth having a rectangular cross section formed on the inner peripheral surface side of the yoke and projecting in the inner diameter direction with a spacing in the circumferential direction, a conductive wire is sequentially wound spirally from the base end side to the inner end side. The coil is laminated so as to have an asymmetrical cross-sectional shape on both sides in the circumferential direction of the teeth by repeatedly rotating and feeding and repeating spiral winding from the inner end side to the base end side in order. In the stator of a rotating electric machine,
The coil is wound in a stacked manner, and the intersection of the conducting wires by the feeding and returning is arranged on the coil end side, and the conducting wire wound on the innermost side in the same layer does not become the innermost side on the coil end side. A stator for a rotating electrical machine, wherein   The stator for a rotating electrical machine according to claim 1, wherein the conducting wire wound on the innermost side in the same layer is wound and fixed by another conducting wire wound on the coil end side.

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