JP2013074750A - Rotary electric machine stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the height of a coil end in a rotary electric machine stator and reliably fix a wire wound coil including a junction.SOLUTION: A wire wound coil 16 wound around a stator core 14 of a rotary electric machine stator 10 comprises: linear coils 30 which have a larger amount of projection at a coil end 18, and include a shape forming a parallel clearance between adjacent linear coils; and stepwise coils 40 extending in a circumferential direction and an axial direction of the stator with a plurality of level differences, which have a smaller amount of projection at the coil end 18, and include a shape forming an uneven clearance between adjacent stepwise coils. The linear coils 30 are provided at their ends with a junction part 22 which connects different wire wound coils or a junction part 22 which connects a wire wound coil with an external wiring.

Description

  The present invention relates to a rotating electrical machine stator, and more particularly to a rotating electrical machine stator having a joint at a coil end.

  A stator of a rotating electrical machine is configured by winding a winding coil around a stator core. A portion where the wound winding coil protrudes in the axial direction of the stator core is called a coil end. Since the protrusion amount of the coil end determines the size of the rotating electrical machine, it is preferable to reduce the protrusion amount of the coil end.

  For example, Patent Document 1 describes a structure for reducing the height of a coil end of a stator winding protruding from a stator core as a stator of a rotating electrical machine. Here, in the stator winding, the turn part between two slots arranged at different positions in the circumferential direction includes a crank part without twisting and a slot side step part provided where the turn part protrudes from the slot And an intermediate step portion between the crank portion and the slot side step portion.

  Patent Document 2 states that, as a stator of a rotating electrical machine, the dielectric strength is in the order of interphase insulation, anti-ground insulation, and in-phase insulation from the highest to the lowest, and the highest dielectric strength is required. It has been pointed out that when an insulating film is combined with a proper interphase insulation, for example, the in-phase insulation has an excessive dielectric strength, and the coil space factor in the slot decreases. Therefore, it is disclosed that a plurality of coils are disposed adjacent to each other at the coil end, and the coil is covered with a cylindrical coil insulating member having a hollow inside at a place where interphase insulation is required. Here, the winding at the coil end extends in a straight line and is bent at the bending portion.

  Further, in Patent Document 3, as a wire used for a stator of a rotating electrical machine, a slot accommodating portion at both ends accommodated in two separate slots of the stator core and a slot accommodating portion at both ends are arranged. It is disclosed that the turn part has a convex part formed at the center part that is formed in a protruding direction after being bent from the end part of the stator core. ing. It is said that heat generated in the winding through the recessed portion is easily released.

JP 2010-119296 A JP 2011-72071 A JP 2011-103755 A

  As described in Patent Document 1, a coil end extending over a different slot is formed by forming a step at the coil end of the winding coil into a shape extending linearly without being stepped. Can be lowered. On the other hand, since the winding coil is bent in a staircase shape, the gap between adjacent winding coils tends to be narrow where the staircase bends, resulting in a nonuniform gap.

  The winding coil is hardened with resin for both insulation and fixation. However, in the winding coil having a stepped coil end, the gap between adjacent winding coils is non-uniform, so that the resin is not uniform. Filled uniformly and the fixing force becomes non-uniform. The coil end is provided with a joint for connection to the outside and for connection between different winding coils, but if the resin fixing force of the winding coil having the joint is uneven, the joint is reliable. It is not fixed to the.

  The objective of this invention is providing the rotary electric machine stator which can fix the winding coil which has a junction part reliably, suppressing the height of a coil end.

  The rotating electrical machine stator according to the present invention is a linear coil that extends linearly along the circumferential direction and the axial direction of the stator at a coil end protruding from the end surface of the stator core as a winding coil wound around the stator. However, the amount of protrusion at the coil end is large, but the linear coil having a shape that forms a parallel gap between adjacent linear coils, and the coil end along the circumferential direction and the axial direction of the stator. A stepped coil extending with a plurality of steps, the protruding amount at the coil end being small, but a stepped coil having a shape in which the gap between adjacent stepped coils is non-uniform In addition, the end of the linear coil is provided with a joint for joining different winding coils, or a joint for joining between the winding coil and external wiring.

  In the rotating electric machine stator according to the present invention, it is preferable that the linear coil is disposed on the innermost or outermost side of the stator core.

  In the rotating electrical machine stator according to the present invention, the end of the linear coil extends from the inner peripheral side of the stator core toward the outer peripheral side and beyond the upper end of the coil end of the stepped coil. It is preferable that a joining part is provided in the outer peripheral side of this.

  Moreover, in the rotating electrical machine stator according to the present invention, it is preferable that adjacent winding coils are fixed to each other with resin.

  With the above configuration, the rotating electric machine stator is a linear coil that linearly extends along the circumferential direction and the axial direction of the stator, and the protruding amount at the coil end is large, but between the adjacent linear coils. A linear coil having a shape that forms a parallel gap, and a stepped coil extending with a plurality of steps along the circumferential direction and the axial direction of the stator. A stepped coil having a shape in which a gap between the stepped coil and the stepped coil is non-uniform. And a junction part is provided in the edge part of a linear coil. Since the gap between adjacent linear coils is parallel and uniform, for example, when fixing a winding coil with resin, a much stronger fixing force is obtained compared to the resin fixing force of the adjacent stepped coil. Can do. Thereby, the winding coil which has a junction part can be fixed reliably, suppressing the height of a coil end.

  In the rotating electric machine stator, the linear coil is arranged on the innermost or outermost side of the stator core. That is, since the stepped coil is arranged except for the innermost peripheral side or the outermost peripheral side of the stator core, the height of the coil end can be sufficiently suppressed.

  In the rotating electric machine stator, the linear coil extends from the inner peripheral side of the stator core to the outer peripheral side, over the coil end of the stepped coil, and a joint portion is formed on the outer peripheral side of the stator core. Provided. Thus, the end of the linear coil extends using the stepped coil with the coil end height suppressed. Therefore, the winding coil having the joint portion can be reliably fixed while suppressing the height of the coil end.

It is a figure which expands and shows the rotary electric machine stator of embodiment which concerns on this invention, and its coil end. It is an enlarged detail drawing of the coil end of the rotary electric machine stator of embodiment which concerns on this invention. It is a figure which shows the linear coil in the coil end of the rotary electric machine stator of embodiment which concerns on this invention. It is a figure which shows the step-like coil in the coil end of the rotary electric machine stator of embodiment which concerns on this invention. It is a figure which shows a mode that resin fixation was performed in the structure of FIG. It is a figure which shows a mode that resin fixation was performed in the structure of FIG.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In the following, a case where both terminals of the segment coil are inserted into different slots, both terminals protrude toward the coil end side, and the terminals of the different segment coils are joined is described as the winding coil joining. It is also possible to use a winding coil having the same winding method to join between different winding coils or between the winding coil and external wiring.

  The number of turns of the winding coil described below, the winding method, the setting of the step of the stepped coil, the bending method of the linear coil, the shape of the end, etc. are examples for explanation, and It can be changed appropriately according to the specifications.

  Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted. In the description in the text, the symbols described before are used as necessary.

  FIG. 1 is a perspective view of the rotating electrical machine stator 10 and a partially enlarged view of the coil end 18. The rotating electrical machine stator 10 includes a case 12, a stator core 14, and a winding coil 16.

  The case 12 is a housing that fixes the outer peripheral side of the stator core 14 and the like, and is a member that becomes a motor case when a rotating electrical machine is configured in combination with a rotating electrical machine rotor (not shown).

  The stator core 14 is a cylindrical member in which electromagnetic steel plates punched into a predetermined shape are stacked. The outer peripheral side is attached and fixed to the case 12, and a rotating electrical machine rotor (not shown) is disposed in the cylindrical hollow portion on the inner peripheral side. In the stator core, a plurality of protrusions called teeth are arranged along the circumferential direction on the inner peripheral side, and the winding coil 16 is wound in a space called a slot between adjacent teeth.

  The winding coil 16 is a conductor with insulation coating that is wound around a plurality of slots of the stator core 14 by a predetermined winding method. The cross-sectional shape of the conducting wire is rectangular and is a conducting wire called a square coil.

  Here, the winding coil 16 is obtained by bending a wire called a segment coil into a predetermined shape. Specifically, both terminals of the segment coil are respectively inserted into different slots, both terminals of the segment coil protrude to the coil end side, and the terminals of the different segment coils are joined. By repeating this a plurality of times, the insulation-coated conductor wires having a predetermined number of turns are arranged in different slots.

  The winding coil 16 protrudes in the axial direction of the stator core 14 along with the winding. The protruding portion is shown as a coil end 18 in FIG. The coil end 18 is provided with a portion straddling different slots and a joint 22 at the end of the winding coil 16. The joining portion 22 is a portion that connects between the other winding coil 16 or between the winding coil 16 and the external wiring by connection means such as welding.

  In the enlarged view of FIG. 1, it is shown that two types of coils, ie, a linear coil 30 and a stepped coil 40 are used as the winding coil 16 across different slots in the coil end 18. FIG. 2 is a diagram schematically showing the coil end 18 viewed from the inner peripheral side of the rotating electrical machine stator 10, and shows the teeth 24 and the slots 26 of the stator core 14. In both the linear coil 30 and the stepped coil 40, the portion protruding from the slot 26 constitutes the coil end 18.

  As shown in FIG. 2, the linear coil 30 is disposed on the innermost peripheral side of the stator core 14, and the stepped coil 40 is disposed on the outer peripheral side thereof. The end portion of the linear coil 30 extends from the inner peripheral side of the stator core 14 toward the outer peripheral side over the coil end 18 of the stepped coil 40 and is joined to the outer peripheral side of the stator core 14. A portion 22 is provided.

  FIG. 3 is a diagram schematically showing the state of the linear coil 30 at the coil end 18. The linear coil 30 is a winding coil 16 having a shape extending linearly along the circumferential direction and the axial direction of the stator core 14 at a predetermined inclination angle after protruding from the slot 26 of the stator core 14. . The predetermined inclination angle is the same angle common to each linear coil 30.

Therefore, in the plurality of linear coils 30 protruding from each slot 26 and extending in an inclined manner, the gap S ₀ between the adjacent linear coils 30 is the same, and is uniform S ₀ while extending linearly. is there. Further, since it extends in a straight line and is not bent in the meantime, the cross-sectional shape is constant with the width W ₀ and the height H ₀ of the original rectangular shape. From these, the space | interval between the adjacent linear coils 30 becomes uniform.

FIG. 4 is a diagram schematically showing the state of the stepped coil 40 at the coil end 18. The stepped coil 40 protrudes from the slot 26 of the stator core 14 and then has a shape extending with a plurality of steps along the circumferential direction and the axial direction of the stator core 14. FIG. 4 shows a portion up to the maximum height CH ₁ of the stepped coil 40. In this example, protruding from the slot 26, before reaching the maximum height CH _1, stepwise bending are provided in four stages. This step-like bend is repeated at intervals of a circumferential length close to the adjacent slot interval of the stator core 14, and the slope connecting the flat portion parallel to the end plane of the stator core 14 and the adjacent flat portion. It consists of parts.

In the example of FIG. 4, the stepped coil 40 goes up the three-step staircase from the slot 26 and becomes the fourth flat portion. The slot 26 is reached and inserted into the slot 26. A slot 26 which stepped coil 40 protrudes, between another slot 26 that is inserted through the maximum height CH ₁ is a different slot distances stepped coil 40. Here, the rotary electric machine is a distributed winding three-phase synchronous type, and the distance between different slots of the stepped coil 40 is an interval of 6 slots. That is, if the slot 26 that protrudes first is the first slot and the slots 26 are numbered in order as the second slot and the third slot, they are inserted into the seventh slot.

If the linear coil 30 is used instead of the stepped coil 40 and it is arranged at an interval of 6 slots, the maximum height CH ₀ (see FIG. 5) is set to the inclination angle of the stepped coil 40. If it is the same as this angle, it will be considerably higher than CH ₁ . That is, the stepped coil 40 has an effect of suppressing the height of the coil end 18 to be lower than that of using the linear coil 30.

It stepped coil 40, because it has a bent shape and a inclined portion flat portion, the gap between the stepped coil 40 Adjacent appear a narrow gap S ₁ is wider gap S ₂ is uniform Absent. In addition, since the rectangular coil having a rectangular cross section is bent, the cross sectional shape of the bent portion is deformed from the original rectangular shape, resulting in a partially swelled shape. FIG. 4 shows a state in which the lower side W ₁ and the upper side width W ₂ are different. This widened W ₁ is wider than the original rectangular width W ₀ shown in FIG. 3, and has a swollen shape. The height H _{1 is} also different from the height H ₀ of the original rectangular shape shown in FIG. For these reasons, the gap between the adjacent stepped coils 40 is not uniform.

  The operation of the above configuration will be described with reference to FIGS. These figures correspond to FIGS. 3 and 4, respectively, and show a state in which the winding coil 16 is impregnated with resin, solidified, and fixed to each other. As the resin, an adhesive such as varnish can be used.

As shown in FIG. 3, the gap S ₀ between the adjacent linear coils 30 is uniform at the location where the plurality of linear coils 30 are arranged in parallel. Therefore, the resin 50 in FIG. ₀ is uniformly impregnated and solidified. Therefore, the adjacent linear coils 30 are fixed by the resin 50 having a uniform thickness, and the fixing force is uniform and stable and strong. The joint portion 22 is provided at the end of the linear coil 30, but since the linear coils 30 are fixed with a firm fixing force, the joint portion 22 is also securely fixed at the coil end 18.

Note that CH ₀ in FIG. 5 is the maximum height when the linear coil 30 crosses two slots 26 separated by six slots. After the linear coil 30 protruding from the slot 26, at a constant inclination angle, extends straight along the circumferential direction and the axial direction of the stator core 14, when the maximum reached height CH _0, the direction of the inclination angle therefrom Is lowered straight and inserted into another slot 26 that is six slots away from the first slot 26. Therefore, the maximum height CH ₀ of the linear coil 30 is determined by the length of the 6-slot interval and the inclination angle, and is higher than the maximum height CH ₁ of the stepped coil 40.

FIG. 6 is a diagram showing the state of impregnation and solidification of the resin 52 at the location of the stepped coil 40. As shown in FIG. 4, since the narrow gap S ₁ and the wide gap S ₂ are mixed between the plurality of stepped coils 40, the narrow gap S ₁ is hardly impregnated with resin. FIG. 6 is a view as seen from the inner peripheral side of the stator core 14, but the gap in the direction toward the other side of the page, that is, the direction toward the radial direction of the stator core 14 is not uniform. In other words, as described with reference to FIG. 4, the cross-sectional shape of the stepped coil 40 is locally bulged at a portion where there is a stepped bend, so that the gap along the radial direction is not uniform.

  Therefore, by using a plurality of stepped coils 40, as described in FIG. 4, the height at the coil end 18 can be kept lower than when using a linear coil, but on the other hand, a plurality of steps are used. The resin fixing force between the adjacent stepped coils 40 is not uniform at the place where the coil-shaped coils 40 are arranged, and is non-uniform.

  As described above, the stepped coil 40 is effective in suppressing the protruding amount at the coil end 18, but the fixing force by the resin such as varnish is not uniform. The linear coil 30 has a uniform and stable fixing force by the resin, but the protruding amount at the coil end 18 becomes large. According to the configuration of the rotating electrical machine stator 10 described with reference to FIGS. 1 and 2, these two types of winding coils 16 are combined. That is, a linear coil 30 is used for the winding coil 16 having a joint portion 22 that requires a stable fixing force at its end, and this is disposed on the inner peripheral side of the stator so that an appropriate fixing force is sufficient. Stepped coils 40 are used in places other than.

  As a result, the winding coil 16 having the joint portion 22 can be reliably fixed while suppressing the height of the coil end 18. Moreover, since the linear coil 30 has the original cross-sectional shape and does not bulge in the width direction due to bending, the increase in the volume in the radial direction can be suppressed. As described above, according to the rotating electrical machine stator 10 having the configuration shown in FIGS. 1 and 2, it is possible to secure the fixing force of the winding coil 16 having the joint 22 while reducing the size.

  The rotating electrical machine stator according to the present invention can be used for a rotating electrical machine mounted on a vehicle.

  10 Rotating electrical machine stator, 12 case, 14 stator core, 16 winding coil, 18 coil end, 22 joint, 24 teeth, 26 slots, 30 linear coil, 40 stepped coil, 50, 52 resin.

Claims (4)

As a winding coil wound around the stator,
In the coil end protruding from the end surface of the stator core, a linear coil extending linearly along the circumferential direction and the axial direction of the stator, and the protruding amount at the coil end is large, but between the adjacent linear coils A linear coil having a shape that forms parallel gaps;
In the coil end, a stepped coil extending with a plurality of steps along the circumferential direction and the axial direction of the stator, and the amount of protrusion at the coil end is small, but there is a gap between adjacent stepped coils A stepped coil having a non-uniform shape,
A rotating electrical machine stator, characterized in that a joining portion for joining different winding coils or a joining portion for joining between a winding coil and external wiring is provided at an end portion of the linear coil. In the rotating electrical machine stator according to claim 1,
The rotating electrical machine stator, wherein the linear coil is disposed on the innermost or outermost side of the stator core. The rotating electrical machine stator according to claim 2,
The end portion of the linear coil extends from the inner peripheral side of the stator core to the outer peripheral side, over the coil end of the stepped coil, and a joint is provided on the outer peripheral side of the stator core. Rotating electric machine stator. In the rotating electrical machine stator according to claim 1,
A rotating electrical machine stator, wherein adjacent winding coils are fixed to each other by a resin.

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