JP6840217B1 - Rotating machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a distributed winding type stator coil by connecting a plurality of unit coils for each phase, by reducing the radial and circumferential distances between the plurality of connecting portions for miniaturization. , There was a problem that the workability of assembly deteriorated. SOLUTION: A unit coil is formed by winding one lead wire, and has a slot accommodating portion housed in the slot and a coil end portion extending from the slot accommodating portion, and the coil end portion. A first connection portion and a second connection portion to which the unit coils of the same phase are connected are provided, and a plurality of the unit coils are attached to the slots of the stator core, and the circumference of the stator core is peripheral. The first connection portions of the plurality of phases are arranged at predetermined intervals in the circumferential direction of the stator coil at the coil end portions, and the second connection portions of the plurality of phases are arranged so as to be offset in the direction. The portion is arranged closer to the outer periphery of the stator coil than the first connection portion to secure a working space. [Selection diagram] Fig. 1

Description

The present application relates to a rotary electric machine.

Rotating electric machines used for electric motors, generators, etc. are required to be compact, have high output, and have high efficiency. In particular, in an in-vehicle motor, it is desirable that the motor has a large output as a drive source for a vehicle and is small in size because it is in-vehicle. In order to increase the output of the in-vehicle motor, a distributed winding using a coil with a substantially rectangular cross section is adopted. The distributed winding is a configuration in which a plurality of unit coils are wound across a plurality of slots, and unit coils of different phases or in-phase are arranged so as to overlap each other at the coil end. The stator of this distributed winding can bring the rotating magnetic field around the inner circumference of the stator closer to a sine wave, and can realize a rotating electric machine with high output and low noise. In order to further increase the output, a line having a rectangular cross section is used for the coil to increase the cross-sectional area occupied by the coil in the stator slot.

Further, for miniaturization, Patent Document 1 proposes connection positions of a plurality of unit coils. That is, in the conventional unit coil connection, since the terminal wire extending from the slot storage portion is connected and arranged on the outer diameter side of the stator, the connecting portions arranged close to each other are different-phase coils. In this case, the potential difference between the connecting portions becomes large, so that it is necessary to secure a distance between the connecting portions to such an extent that sufficient insulation can be maintained. Then, there is a problem that the peripheral length of the stator becomes large and the size of the stator becomes large. In response to this problem, in the arrangement of unit coils of different phases, the insulation distance is secured in the circumferential direction and the radial direction of the stator by alternately arranging the connection portions on the inner diameter side and the outer diameter side of the stator. Is. As a result, the peripheral length of the stator can be reduced, and the size of the stator can be reduced.

Japanese Unexamined Patent Publication No. 2011-182579

In the structure of Patent Document 1, the distance required for insulation between the connecting portions is secured in both the circumferential direction and the radial direction, but while the distance in the circumferential direction can be reduced, it is necessary to increase the distance in the radial direction. Therefore, there is a problem that the size cannot be reduced sufficiently and the connection parts are arranged alternately, so that the insertability of the assembly jig such as the terminal wire joining is deteriorated and the workability of the assembly is deteriorated. is there.

An object of the present application is to provide a rotary electric machine capable of further improving the workability of assembling a stator.

In the rotary electric machine of the present application, the stator includes a stator core having a plurality of teeth and a plurality of slots arranged in the circumferential direction of the inner wall, and a stator coil composed of a plurality of unit coils. A unit having a slot accommodating portion formed by winding one lead wire and accommodating in the slot and a coil end portion extending from the slot accommodating portion, and having the same phase with each other in the coil end portion. A first connecting portion and a second connecting portion to which the coils are connected are provided, and a plurality of the unit coils are attached to the slots of the stator core and arranged so as to be offset in the circumferential direction of the stator core. At the coil end portion, the first connecting portions of the plurality of phases are arranged at predetermined intervals in the circumferential direction of the stator coil, and the second connecting portions of the plurality of phases are the first connecting portions of the plurality of phases. It is characterized in that it is arranged closer to the outer periphery of the stator coil than the connecting portion.

According to the rotary electric machine disclosed in the present application, by arranging the connection portions of the unit coils used for the stator coil by shifting them in the radial direction, the distance between the connection portions can be widened as compared with the arrangement only in the circumferential direction. Therefore, it becomes easy to insert an assembly jig such as terminal wire joining, and the workability of assembly is improved.

It is a perspective view of the stator of Embodiment 1 of this application. It is a top view of the stator of Embodiment 1 of this application. It is a figure which showed the arrangement of the phase in the top view of the stator of Embodiment 1 of this application. It is sectional drawing of the stator of Embodiment 1 of this application. It is sectional drawing of the stator of Embodiment 2 of this application. It is sectional drawing of the stator of Embodiment 3 of this application. It is sectional drawing of the stator of Embodiment 4 of this application. It is sectional drawing of the stator of Embodiment 5 of this application. It is an enlarged view of the stator of Embodiment 1 of this application. It is an enlarged view of the stator of Embodiment 6 of this application.

Embodiment 1
FIG. 1 shows the stator 1 of the rotary electric machine according to the first embodiment by a perspective view. The stator 1 is used in a rotary electric machine having a three-phase configuration of U-phase, V-phase and W-phase. The stator 1 includes a stator core 2 and a distributed winding type stator coil 3 provided on the stator core 2. The stator core 2 is assembled by laminating thin electromagnetic steel sheets and caulking, adhering, welding or the like so as not to separate them. The stator core 2 is an integral or split core and is formed in an annular shape. The stator core 2 has a tooth portion forming a plurality of slots, an insulating member is assembled on the side surface of the tooth portion, and a stator coil 3 covered with an insulating coating is mounted in the slot via the insulating member. ing.

The stator coil 3 is composed of a plurality of unit coils 4. The unit coil 4 has a slot accommodating portion 5 and a coil end portion 6 extending from the slot accommodating portion 5, and the coil end portion 6 includes a terminal wire 7 at the beginning of winding and a terminal wire 7 at the end of winding. ing. A plurality of the unit coils 4 are arranged so as to be offset in the circumferential direction (direction indicated by the arrow A in the drawing), and the slot accommodating portion 5 is mounted in the slot to be arranged in an annular shape. It is assembled and connected to the slot.

In the first embodiment, the stator coil 3 includes a U-phase coil that constitutes the U-phase, a V-phase coil that constitutes the V-phase, and a W-phase coil that constitutes the W-phase. The coil of each phase is composed of a plurality of unit coils 4. The unit coil 4 constituting each phase coil is assembled in a plurality of slots of the stator core 2 in a concentric winding manner across different phase slots to which other different phase coils are assembled.

The insulating film is peeled off from the tip of the terminal wire 7 extending from the upper part of the coil end portion 6, and the conductor portion is exposed. In a state where two or more terminal wires are overlapped, TIG welding or laser welding is performed. Has a connection that is electrically joined. The connecting portions are arranged in an annular shape with a predetermined interval so that a chuck jig for grasping the terminal wire at the time of welding can be inserted from the radial direction.

As shown in FIG. 1, in the stator 1, both the first connecting portion 8 and the second connecting portion 9 provided in the respective unit coils 4 are in the axial direction of the stator core 2 (indicated by arrows B in the drawing). It is arranged on the upper end surface in the direction shown). Of the plurality of unit coils 4, the second connecting portions 9 of adjacent unit coils 4 constituting a certain phase coil (for example, "U-phase coil") are connected to each other at a position closer to the outer circumference of the stator core 2. Be connected. The first connecting portions 8 of the adjacent unit coils 4 that also form a coil of a certain phase (for example, "U-phase coil") are connected to each other at a position closer to the inner circumference of the stator core 2. This relationship is shown in FIG. In the figure, the portions circled are the first connecting portion 8 and the second connecting portion 9. The second connecting portion 9 is arranged from the outer circumference in the radial direction (the direction indicated by the arrow C in the figure) with respect to the first connecting portion 8, and the distance between the connecting portions is further widened by shifting in the radial direction. Therefore, it leads to improvement of assembling property such as terminal wire joining. Alternatively, by reducing the distance in the circumferential direction by the amount that the distance is widened by shifting in the radial direction, the peripheral length between the connecting portions is reduced, and the stator can be miniaturized.

By arranging the second connecting portion 9 side by side in the radial direction of the stator 1 with respect to the first connecting portion 8, the distance between the connecting portions in the circumferential direction can be widened, and the chuck jig can be used during the assembly work. Since it is possible to insert the jig from the radial direction only once, it leads to further improvement in assembling property. Alternatively, by reducing the distance in the circumferential direction, the peripheral length between the connecting portions can be reduced, and the stator can be further miniaturized.

FIG. 3 shows the arrangement relationship of the three phases in the top view of the stator 1 of the rotary electric machine. As shown in FIG. 3, the first connecting portion 8 is arranged in the order of U phase, U phase, V phase, V phase, W phase, and W phase counterclockwise when viewed from the upper side of this figure. .. Similarly, the second connecting portion 9 is arranged in the order of U phase, V phase, and W phase clockwise when viewed from the upper side of this figure.

The positional relationship between the first connecting portion 8 and the second connecting portion 9 is such that the closest first connecting portion 8 and the second connecting portion 9 are in phase with each other. That is, when the second connecting portion 9 is in the U phase, the closest first connecting portion 8 is in the U phase of the same phase, and when the second connecting portion 9 is in the V phase, the closest first connecting portion is used. When 8 is in V phase and the second connecting portion 9 is in W phase, the closest first connecting portion 8 is in W phase. By arranging in this way, the potential difference between the connecting portions can be reduced, and the required insulation distance can be reduced. With this configuration, the radial distance between the first connecting portion and the second connecting portion can be reduced while maintaining the insulation performance, so that the outer diameter size of the stator can be reduced.

According to the stator 1 of the first embodiment, the first connecting portion 8 and the second connecting portion 9 of the adjacent unit coils 4 constituting the in-phase coil form the inner circumference of the stator core 2. It is arranged separately in the near position and the outer peripheral position. Therefore, for a plurality of connection portions (first connection portion 8 and second connection portion 9), the distance between adjacent connection portions can be relatively wide, and when performing connection work, other connection portions can be used. The risk of interference with the connection portion is reduced, and the efficiency of the connection work can be improved.

Embodiment 2
The shape of the first connecting portion 8 and the second connecting portion 9 of the unit coil 4 in the first embodiment is a straight line extending in the axial direction of the stator 1 from the base to the tip as shown in the cross-sectional view in FIG. It has a shape. Note that FIG. 4 is a cross-sectional view taken along the line XY shown in FIG. 2, where X indicates the outer peripheral side of the stator 1 and Y indicates the inner peripheral side. Subsequent figures have the same relationship. In contrast to the relationship of FIG. 4, in the second embodiment, as shown in FIG. 5, the tip shape of the second connecting portion 9 is bent inward in the radial direction of the stator 1. It has become.

According to the second embodiment, the unit coil 4 having the same phase is selected for the first connection portion 8 and the second connection portion 9, and the second connection portion 9 is set as the base point of the lower coil end portion 6. By bending the coil so as to straddle the coil, the distance between the tip portions of the first connecting portion 8 and the second connecting portion 9 can be reduced. Therefore, the working space can be widened, and the tip portion of the second connecting portion 9 is bent inward, so that the outer diameter size of the stator 1 can be reduced.

Embodiment 3
In the third embodiment, the positional relationship between the first connecting portion 8 and the second connecting portion 9 is exchanged with respect to the first embodiment. That is, as shown in FIG. 6, the second connecting portion 9 is arranged on the inner peripheral side in the radial direction of the stator 1 with respect to the first connecting portion 8, and the tip shape of the first connecting portion 8 is formed. Is bent inward in the radial direction of the stator 1.

In the third embodiment, similarly to the second embodiment, the unit coil 4 having the same phase is selected for the first connecting portion 8 and the second connecting portion 9 which are bent, and the first connecting portion 8 is formed. By bending the lower coil end portion 6 so as to straddle the base point, the distance between the tip portions of the second connecting portion 9 and the first connecting portion 8 can be reduced. Therefore, the working space can be widened, and the tip portion of the first connecting portion 8 is bent inward, so that the outer diameter size of the stator 1 can be reduced.

Embodiment 4
In contrast to the first embodiment, in the fourth embodiment, as shown in FIG. 8, the first connecting portion 8 is bent outward in the radial direction of the stator 1. In this case, the first connecting portion 8 is on the inner peripheral side of the stator 1, and the second connecting portion 9 is arranged on the outer peripheral side of the stator 1.
In the fourth embodiment, the first connecting portion 8 and the second connecting portion 9 are selected and connected so as to be in phase with each other, and the first connecting portion 8 is connected to the lower coil end portion 6. By bending so as to straddle the base point, the inner diameter size of the stator 1 can be increased, so that the space on the inner diameter side of the stator 1 is expanded, and for example, the arrangement of parts such as a resolver becomes easy.

Embodiment 5
In contrast to the first embodiment, in the fifth embodiment, as shown in FIG. 8, the second connecting portion 9 is arranged on the inner peripheral side of the stator 1 in the radial direction with respect to the first connecting portion 8. The second connecting portion 9 is bent outward in the radial direction of the stator 1. In the fifth embodiment, the first connecting portion 8 and the second connecting portion 9 are selected and connected so as to be in phase with each other, and the second connecting portion 9 is connected to the lower coil end portion 6. By bending so as to straddle the base point, the inner diameter size of the stator 1 can be increased, so that the space on the inner diameter side of the stator 1 is expanded, and for example, the arrangement of parts such as a resolver becomes easy.

In the fifth embodiment, the first connecting portion 8 and the second connecting portion 9 are connected so as to be in phase with each other, and the second connecting portion straddles the lower coil end portion as a base point. By bending, the inner diameter size of the stator can be increased, so that the space on the inner diameter side of the stator is expanded and parts such as resolvers can be easily arranged.

Embodiment 6
In contrast to the first embodiment, in the sixth embodiment, the distance between the first connecting portion 8 and the second connecting portion 9 is smaller in the in-phase than in the out-of-phase. That is, in the first embodiment, as shown in FIG. 9, the first connecting portion 8 and the second connecting portion 9 are arranged at predetermined equal intervals, respectively.

On the other hand, in the sixth embodiment, as shown in FIG. 10, in the case of in-phase, the interval is narrower than in the case of different-phase. For example, when the second connecting portion 9 is the V phase, of the three adjacent first connecting portions 8, the two V phases are closely spaced from the second connecting portion 9, and the spacing is small from the one U phase. It's getting bigger. The potential difference between in-phase connections is smaller than in different-phase connections, and the required insulation distance can be reduced. With this configuration, the circumferential spacing can be made smaller than when the first connecting portions 8 are arranged at equal intervals, so that the peripheral length between the connecting portions becomes smaller, and the stator can maintain its insulation performance. It can be miniaturized.

As described in each embodiment, the distance between the first connecting portion 8 and the second connecting portion 9 at the coil end of the unit coil 4 can be set wide, and the efficiency of the assembling work can be improved. Can be done.

Although the present application describes various exemplary embodiments and examples, the various features, embodiments, and functions described in one or more embodiments are applications of a particular embodiment. It is not limited to, but can be applied to embodiments alone or in various combinations.
Therefore, innumerable variations not illustrated are envisioned within the scope of the techniques disclosed in the present application. For example, it is assumed that at least one component is modified, added or omitted, and further, at least one component is extracted and combined with the components of other embodiments.

1 Stator, 2 Stator core, 3 Stator coil, 4 Unit coil, 5 Slot storage, 6 Coil end, 7 Terminal wire, 8 1st connection, 9 2nd connection

Claims (8)

The stator includes a stator core having a plurality of teeth and a plurality of slots arranged in the circumferential direction of the inner wall, and a stator coil composed of a plurality of unit coils.
The unit coil is formed by winding one lead wire, has a slot accommodating portion housed in the slot, and a coil end portion extending from the slot accommodating portion, and is homologous to the coil end portion. The unit coil is provided with a first connection portion and a second connection portion to which the unit coil is connected, and a plurality of the unit coils are attached to the slots of the stator core and displaced in the circumferential direction of the stator core. In the coil end portion, the first connecting portions of the plurality of phases are arranged at predetermined intervals in the circumferential direction of the stator coil, and the second connecting portions of the plurality of phases are arranged. A rotary electric machine characterized in that it is arranged closer to the outer periphery of the stator coil than the first connection portion. The rotary electric machine according to claim 1, wherein at least one or more of the plurality of first connecting portions adjacent to the second connecting portion is in phase with the second connecting portion. The rotary electric machine according to claim 1, wherein the first connecting portion and the second connecting portion are arranged side by side in the radial direction of the stator. The rotary electric machine according to claim 1, wherein the tip end portion of the second connecting portion is bent inward in the radial direction of the stator. The arrangement of the first connection portion and the second connection portion is exchanged, the second connection portion is arranged on the inner peripheral side in the radial direction of the stator, and the tip portion of the first connection portion is The rotary electric machine according to claim 1, wherein the stator is bent inward in the radial direction. The rotary electric machine according to claim 1, wherein the tip end portion of the first connecting portion is bent outward in the radial direction of the stator. The arrangement of the first connection portion and the second connection portion is exchanged, the second connection portion is arranged on the inner peripheral side in the radial direction of the stator, and the tip portion of the second connection portion is The rotary electric machine according to claim 1, wherein the stator is bent outward in the radial direction. The first aspect of the present invention is characterized in that the distance between the second connecting portion and the first connecting portion having the same phase is smaller than the distance between the second connecting portion and the first connecting portion having a different phase. The rotary electric machine described.

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