JP2017118606A - Motor stator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain downsizing of a stator coil while preventing insulation paper from being dragged by the stator coil when inserting the stator coil into a slot.SOLUTION: Side parts 44b and 44c of an insulation member are deformed from a rectangular shape to a shape in which one corner corresponding to an inner rib 38 of a component cuff support among four corners of the rectangular shape is notched so as to be abutted to the inner ring 38, such that corners Cb and Cc of the side parts 44b and 44c are abutted to the inner rib 38. Thus, downsizing of the segment coil can be attained while preventing the insulation member from being dragged by the segment coil when inserting a segment coil from an opposite side of the component cuff support with respect to a stator core 22 towards the component cuff support.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a stator for an electric motor.

  Conventionally, as this type of stator for an electric motor, one including a stator core, a component cuff, an insulating paper, and a conductive wire (coil) has been proposed (for example, see Patent Document 1). The stator core has a plurality of teeth and a slot formed between adjacent teeth. The component cuffs are arranged on the end face of the stator core and have a plurality of communication holes (cuffs slots) communicating with the corresponding slots. The insulating paper is inserted into the slot of the stator core. The conducting wire (coil) is wound around the stator core and the component cuff through the insulating paper. In this stator for an electric motor, the tip of the cuff formed by folding the end of the insulating paper in the axial direction outwardly comes into contact with the end surface of the stator core in the axial direction. Thereby, when inserting a conducting wire into the slot, the insulating paper is prevented from being pulled out of the slot by being dragged by the conducting wire.

JP 2014-135865 A

  In the above-described stator for an electric motor, since it is necessary to provide a cuff portion on the insulating paper, it is necessary to increase the axial dimension of the insulating paper. Therefore, the axial dimension of the conducting wire (coil) becomes large. When the size of the conducting wire increases, the loss in the conducting wire increases. Therefore, it is desired to reduce the size of the conductor while suppressing the insulating paper from being dragged by the conductor when the conductor is inserted into the slot.

  The main object of the stator for an electric motor of the present invention is to reduce the size of the stator coil while suppressing the insulating paper from being dragged by the stator coil when the stator coil is inserted into the slot.

  The stator for an electric motor according to the present invention employs the following means in order to achieve the main object described above.

The stator for an electric motor of the present invention is
A stator core having a plurality of teeth and a plurality of slots between the adjacent teeth;
It is formed in an annular shape with an insulating material, and a plurality of communication holes communicating with the corresponding slot, a guide portion between the adjacent communication holes, and an inner peripheral end of the guide portion are connected to each other. An inner rib passed in the direction;
A stator coil inserted into the slot and the communication hole;
A plurality of insulating members that are inserted into the corresponding slots, insulate the stator coil from the slots, and that have a dimension in the axial direction of the stator core larger than that of the slots;
A stator for an electric motor comprising:
The insulating member includes a back portion that covers an inner peripheral surface of the stator core that is located between two adjacent teeth, and two side portions that are continuous with the back portion and cover a circumferential side surface of the teeth. ,
The two side portions have a shape in which one corner corresponding to the inner rib of the component cuff among the four corners of the rectangle is cut out from the rectangle so as to contact the inner rib.
This is the gist.

  In the stator for an electric motor of the present invention, the insulating member includes a back portion that covers the inner peripheral surface of the stator core located between two adjacent teeth, and two side portions that are continuous with the back portion and cover the side surfaces in the circumferential direction of the teeth. ,have. Then, the two side portions have a shape in which one corner corresponding to the inner rib of the component cuffer out of the four corners of the rectangle is cut out so as to contact the inner rib. Thereby, since the corner of the component cuff is in contact with the inner rib, it is suppressed that the insulating member is dragged by the stator coil when the coil is inserted into the slot and the communication hole. In addition, since it is not necessary to bend the insulating member outward, it is possible to reduce the size of the insulating member. Thereby, size reduction of a stator coil can be achieved. Therefore, when the stator coil is inserted into the slot, it is possible to reduce the size of the stator coil while suppressing the insulating member from being dragged by the stator coil.

It is a block diagram which shows the outline of a structure of the stator 20 for electric motors as one Example of this invention. FIG. 2 is a configuration diagram showing an outline of the configuration of a stator core 22, component cuffs 30 and 32, and an insulating member 44. 2 is a configuration diagram showing an outline of a configuration of a main part of a stator 20 for an electric motor. FIG. It is explanatory drawing which shows the outline of the cross section in the AA line of FIG. FIG. 3 is a configuration diagram showing an outline of the configuration of a component cuff 30. FIG. 6 is an explanatory diagram showing a state in which a component cuff 30 is inserted into a slot 26.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a configuration diagram showing an outline of a configuration of an electric motor stator 20 as an embodiment of the present invention. FIG. 2 is a configuration diagram showing an outline of the configuration of the stator core 22, the component cuffers 30 and 32, and the insulating member 44. FIG. 3 is a configuration diagram showing an outline of the configuration of the main part of the stator 20 for the motor. In FIG. 3, the description of the stator coil 40 is omitted. FIG. 4 is an explanatory diagram showing an outline of a cross section taken along line AA of FIG. FIG. 5 is a block diagram showing an outline of the configuration of the component cuff 30. FIG. 6 is an explanatory diagram showing a state in which the component cuff 30 is inserted into the slot 26.

  The stator 20 for an electric motor, together with a rotor (not shown), constitutes a three-phase AC electric motor used as a driving source or a generator for running an electric vehicle or a hybrid vehicle, for example. As shown in FIGS. 1 to 4, the motor stator 20 includes a stator core 22, component cuffers 30 and 32, a stator coil 40, and a plurality of insulating members 44.

  The stator core 22 is configured by laminating a plurality of electromagnetic steel plates formed into an annular shape by press working, for example, and is formed in a cylindrical shape as a whole. As shown in FIGS. 2 to 4, the stator core 22 includes a plurality of teeth 24 projecting radially inward from the annular outer peripheral portion at intervals in the circumferential direction, and a plurality of slots between the teeth 24 adjacent to each other. 26. The stator core 22 may be integrally formed by, for example, pressing and sintering a ferromagnetic powder.

  The component cuffs 30 and 32 are annular plates as shown in FIGS. 2 and 4, and are formed of an insulating material having a high insulating performance such as a resin. The component cuffers 30, 32 have a substantially rectangular shape extending in the radial direction so as to correspond to the plurality of slots 26 of the stator core 22, and a plurality of communication holes 34 formed at intervals in the circumferential direction, and adjacent communication holes 34. It is passed in the circumferential direction so as to connect the guide portion 36 between the inner rib 38 in the circumferential direction so as to connect the end portion on the inner peripheral side of the guide portion 36 and the end portion on the outer peripheral side of the guide portion 36. And an outer rib 39. The inner rib 38 and the outer rib 39 maintain the strength of the component cuffs 30 and 32. In these component cuffers 30 and 32, the communication holes 34 are respectively arranged on both end surfaces in the axial direction of the stator core 22 so as to communicate with the plurality of slots 26 of the stator core 22. The component cuffers 30 and 32 support the segment coil 42 so that it does not contact the stator core 22 when the plurality of segment coils 42 are bent.

  Stator coil 40 forms a U-phase coil, a V-phase coil, and a W-phase coil, and includes a plurality of segment coils 42. The segment coil 42 is formed by bending an electric conductor formed in a substantially U shape. On the surface of the segment coil 42, an insulating film made of, for example, enamel resin or the like is formed.

  The plurality of insulating members 44 are formed of an insulating material, and are inserted into each of the plurality of slots 26 of the stator core 22, as shown in FIGS. 2 to 4, and the stator core 22 and the segment coil 42 (stator coil 40). And are electrically insulated. The insulating member 44 is formed such that the dimension Lia in the axial direction of the stator core 22 is larger than the dimension Lsa of the stator core in the axial direction. Thereby, when the segment coil 42 is bent, the segment coil 42 and the stator core 22 are prevented from contacting each other. As shown in FIG. 5, the insulating member 44 defines two fold lines extending in parallel to the insulating paper at intervals, and makes the insulating paper substantially U-shaped along the two fold lines. It is formed by being bent. Thus, the insulating member 44 includes a back portion 44a that covers the inner peripheral surface P1 of the stator core 22 positioned between the two adjacent teeth 24, and one side surface P2, P3 that is continuous with the back portion 44a and that corresponds to the two teeth 24. Side portions 44b and 44c extending from both ends of the back portion 44a. In the embodiment, the side portions 44b and 44c are formed in a rectangular shape by cutting out one corner corresponding to the inner rib 38 of the component cuff 30 among the four corners of the rectangle so as to contact the inner rib 38. That is, the corners Cb and Cc of the side portions 44 b and 44 c are in contact with the inner rib 38.

  When the motor stator 20 configured as described above is manufactured, the component cuff 30 is disposed on the end face of the stator core 22, and the insulating members 44 are inserted into the slots 26. When inserting the insulating member 44 into the slot 26, as shown in FIG. 6, from the opposite side of the component cuff 30 to the component cuff 30 with respect to the stator core 22 (from the bottom to the top in FIG. 6). The corners Cb and Cc of the side portions 44b and 44c are inserted until they contact the inner rib 38 of the component cuff 30. As described above, the corner portions Cb and Cc of the side portions 44b and 44c are brought into contact with the inner rib 38 of the component cuff 30, whereby the positioning of the insulating member 44 with respect to the stator core 22 can be facilitated.

  When the insulating member 44 is thus inserted into the slot 26, the segment coil 42 (stator coil 40) is inserted into the slot 26 and the communication hole 34. At this time, the segment coil 42 is an insulating member between the segment coil 42 and the stator core 22 from the opposite side of the component cuff 30 with respect to the stator core 22 toward the component cuff 30 (downward to upward in FIG. 6). Insert so that 44 is arranged. After the segment coil 42 is attached in this way, the component cuffer 32 is attached. Since the corners Cb and Cc of the side portions 44b and 44c of the insulating member 44 are in contact with the inner rib 38 of the component cuff 30, the insulating member 44 is inserted when the segment coil 42 is inserted into the slot 26 or the communication hole 34. Dragging by the segment coil 42 is suppressed. Further, since there is no need to bend the insulating member 44 outward, the stator coil 40 (each segment coil) can be downsized.

  According to the motor stator 20 of the embodiment described above, the side portions 44b and 44c of the insulating member 44 are rectangular, and one corner corresponding to the inner rib 38 of the component cuff 30 is selected from the rectangular corners. The segment coil 42 has a shape that is cut out so as to abut against the segment coil 42 while suppressing the insulating member 44 from being dragged by the segment coil 42 when the segment coil 42 (stator coil 40) is inserted into the slot 26. Can be miniaturized.

  In the motor stator 20 according to the embodiment, the component cuffers 30 and 32 are disposed on both end faces of the stator core 22, but only the component cuffer 30 may be disposed without the component cuffer 32.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the stator core 22 corresponds to a “stator core”, the component cuff 30 corresponds to a “component cuff”, the stator coil 40 corresponds to a “stator coil”, and the insulating member 44 corresponds to an “insulating member”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the manufacturing industry of stators for electric motors.

 20 Stator for motor, 22 Stator core, 24 teeth, 26 slots, 30, 32 Parts cuff, 34 Communication hole, 36 Guide part, 38 Inner rib, 39 Outer rib, 40 Stator coil, 42 Segment coil, 44 Insulating member, 44a Back part , 44b, 44c side, Cb, Cc corner, P1 inner peripheral surface, P2, P3 side surface.

Claims (1)

A stator core having a plurality of teeth and a plurality of slots between the adjacent teeth;
It is formed in an annular shape with an insulating material, and a plurality of communication holes communicating with the corresponding slot, a guide portion between the adjacent communication holes, and an inner peripheral end of the guide portion are connected to each other. An inner rib passed in the direction;
A stator coil inserted into the slot and the communication hole;
A plurality of insulating members that are inserted into the corresponding slots, insulate the stator coil from the slots, and that have a dimension in the axial direction of the stator core larger than that of the slots;
A stator for an electric motor comprising:
The insulating member includes a back portion that covers an inner peripheral surface of the stator core that is located between two adjacent teeth, and two side portions that are continuous with the back portion and cover a circumferential side surface of the teeth. ,
The two side portions have a shape in which one corner corresponding to the inner rib of the component cuff among the four corners of the rectangle is cut out from the rectangle so as to contact the inner rib.
Stator for electric motor.

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