JP6233217B2 - Rotating electric machine stator - Google Patents

Description

  The present invention relates to a stator of a rotating electrical machine, and more particularly, to a stator of a rotating electrical machine having fixing means for lead wires of a temperature sensor that measures the temperature of the rotating electrical machine.

  Since the rotating electrical machine generates heat in the coil and the like due to the operation, a temperature sensor for measuring the temperature of the rotating electrical machine is provided, and a lead wire is drawn from the temperature sensor.

  Patent Document 1 discloses that an insulator disposed in a stator of a rotating electrical machine has a wall portion raised on the inner diameter side thereof, and a recess for accommodating a temperature sensor as a temperature measuring element is provided there.

  In Patent Document 2, it is pointed out that the lead-out portion of the stator coil lead wire is covered with an insulating sleeve, so that when the lead wires are twisted together, the insulating sleeve is displaced from the root at that time. Yes. In order to prevent this, it is disclosed that an outer diameter side of an insulator provided at an axial end portion of the stator is raised as a wall portion, and a holding groove for holding an insulating sleeve of a lead wire is provided in the wall portion.

JP 2013-158078 A JP2013-243822A

  As a method for fixing a lead wire of a temperature sensor for measuring the temperature of the rotating electrical machine to the stator of the rotating electrical machine, it is known to fix the lead wire to the stator of the rotating electrical machine using a bracket that holds the lead wire. This method requires a space for fixing the bracket to the stator of the rotating electrical machine, and requires a bracket fastening operation. In addition, depending on the arrangement of the bracket, the variation in the lead wire fixing position may increase, and the movement of the lead wire may increase due to the vibration of the rotating electrical machine, causing damage to the lead wire. Moreover, in order to use the method of the cited documents 1 and 2, the insulator of a special shape is required, an insulator will enlarge, and it will lead to an increase in cost and the enlargement of a rotary electric machine.

  An object of the present invention is to provide a stator of a rotating electrical machine that can fix a lead wire of a temperature sensor with a simple structure and can be stably fixed even by vibrations of the rotating electrical machine.

  A stator of a rotating electrical machine according to the present invention is arranged to cover a stator core having an annular base portion and a plurality of teeth protruding from the base portion toward the inner diameter side, and an axial end surface of the stator core, and a space between adjacent teeth. An annular cuffer made of an insulating material having a plurality of openings through which the coil passes corresponding to a plurality of slots, and a cuffer holding a coil end protruding in the axial direction of the stator core. A fitting portion provided in the annular portion on the side, a claw portion fixed to the fitting portion, and a main body portion that protrudes from the claw portion to the outer diameter side of the stator core and has a recess on a surface facing the axial end of the stator core. And a fixing member made of an insulating material, wherein the lead wire is accommodated between the concave portion of the fixing member and the axial end portion of the stator core.

  According to the above configuration, the fixing member can be easily fixed to the cuffer by the cooperation of the claw part and the fitting part of the cuffer without any particular increase in the size of the cuffer only by providing the fitting part. And since the lead wire of a temperature sensor is arrange | positioned between the recessed part of a fixing member, and the axial direction edge part of a stator core, a lead wire is hard to remove | deviate from a fixing member also by the vibration etc. of a rotary electric machine.

It is a block diagram of the stator of the rotary electric machine in embodiment which concerns on this invention. 1A is an overall perspective view, FIG. 1B is a cross-sectional view taken along the axial direction of FIG. 1A, and FIG. 1C is a temperature sensor lead wire accommodated in a recessed portion of a fixing member. FIG. It is a figure which shows the fixing member used for the stator of the rotary electric machine in embodiment which concerns on this invention. 2A is a top view, FIG. 2B is a front view, FIG. 2C is a side view, and FIG. 2D is a cross-sectional view taken along line AA in FIG. It is. It is a figure which shows the relationship between the cuff and the fixing member in the stator of the rotary electric machine in embodiment which concerns on this invention. FIG. 3A is a view showing a state in which one fixing member is attached to the cuff, and a second fixing member is not yet attached, and FIG. 3B is a state in which the state is not yet attached to the cuff. It is a figure which shows a member, (c) is a figure which shows the dimensional relationship of the insertion opening part provided in a cuff. FIG. 4 is a B-B ′ sectional view of FIG. 3.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. In the following, distributed winding is described as a winding method of the three-phase coil, but this is an example for explanation, and concentrated winding or the like may be used. In the following description, it is assumed that there are two fixing members attached to the cuff, but the number of fixing members may be other than this. For example, the number may be one or three or more.

  The shapes, materials, and the like described below are illustrative examples, and can be appropriately changed according to the specifications of the stator of the rotating electrical machine. Below, the same code | symbol is attached | subjected to the same element in all the drawings, and the overlapping description is abbreviate | omitted.

  FIG. 1 is a configuration diagram of a stator 10 of a rotating electrical machine. Below, unless otherwise indicated, the stator 10 of a rotary electric machine is called the stator 10. FIG. Although not shown in FIG. 1, the stator 10 is provided with a temperature sensor for measuring the temperature of the rotating electrical machine. The stator 10 has a structure in which a lead wire 28 that is a signal wire drawn from a temperature sensor is fixed by a fixing member 50. 1A is an overall perspective view, FIG. 1B is a cross-sectional view along the axial direction of FIG. 1A, and FIG. 1C is a temperature sensor lead wire 28 accommodated in the fixing member 50. FIG.

  The stator 10 is a stator used in a three-phase synchronous rotating electric machine, and each phase coil 20 is wound around the stator core 12 by distributed winding. FIG. 1 shows the axial direction of the stator 10.

  The stator core 12 is an annular magnetic part including a base portion 14 on the outer diameter side, a plurality of teeth 16 protruding from the base portion 14 toward the inner diameter side, and a plurality of slots 18 which are spaces between adjacent teeth 16. is there.

  The stator core 12 is formed by laminating a plurality of annular magnetic thin plates formed into a predetermined shape including the teeth 16 and the slots 18. An electromagnetic steel plate can be used as the magnetic thin plate. Instead of the laminated body of magnetic thin plates, a magnetic powder integrally formed into a predetermined shape can be used.

  Each phase coil 20 is formed by bending a conductor wire with an appropriate insulation coating into a predetermined shape, which is distributed by a predetermined slot interval along the circumferential direction by a distributed winding arrangement method. The three-phase windings in the stator 10 are formed by arranging them between 18.

  As the conductor wire with insulation coating used for each phase coil 20, a rectangular wire having a rectangular cross-sectional shape is used. By using the flat wire, the coil space factor in the slot 18 can be improved. Instead of a flat wire, one having a circular or elliptical cross section may be used.

  The coil ends 22 and 24 are portions where each phase coil 20 wound around the tooth 16 through the slot 18 protrudes from the axial end surface of the stator core 12. In the coil end 22, the coil winding which comprises each phase coil 20 is connected by the predetermined connection method. Each phase terminal 26 is a terminal to which one end of each of the U-phase coil, V-phase coil, and W-phase coil constituting each phase coil 20 is drawn out and connected. Note that the other end of each of the U-phase coil, V-phase coil, and W-phase coil is connected to each other to form a neutral point.

  The component cuff 30 is arranged to cover the axial end surface of the stator core 12 and has an annular member having a plurality of openings through which the coil windings constituting the phase coils 20 correspond to the plurality of slots 18 of the stator core 12. It is. Hereinafter, the part cuff 30 is referred to as the cuff 30 unless otherwise specified. The cuff 30 is a protective member that prevents direct contact with the end face of the stator core 12 when the coil winding inserted and wound in the slot 18 is bent at the axial end of the stator core 12. Made of insulating material. Details of the cuffs 30 will be described later with reference to FIG.

  The fixing member 50 is a component that fixes the lead wire 28 to the stator core 12 via the cuff member 30 and is made of an insulating material. FIG. 2 is a diagram illustrating a fixing member. 2A is a top view, FIG. 2B is a front view, FIG. 2C is a side view, and FIG. 2D is a cross-sectional view taken along line AA in FIG. It is. 2A, 2B, 2C, and 2D show the axial direction, radial direction, and circumferential direction when fixed to the stator core 12. FIG. Regarding the radial direction, the direction on the outer diameter side and the direction on the inner diameter side of the stator core 12 are shown.

  The fixing member 50 includes a claw portion 52 that is fitted and fixed to the fitting portion 40 (see FIGS. 3 and 4) of the cuff member 30, and a main body portion 51 that projects from the claw portion 52 to the outer diameter side of the stator core 12. . The main body 51 is provided with two grooves from the inner diameter side toward the outer diameter side, and the groove does not extend to the end portion on the outer diameter side and stops halfway. As a result, the main body 51 has a three-pronged shape divided by two grooves. A claw portion 52 is provided at an inner diameter side end portion of the three-pronged middle portion 53. Therefore, the three-pronged middle portion 53 having the claw portion 52 at the tip has a cantilever shape in which the outer diameter end portion is a fixed end and the inner diameter end portion is a free end. Can move in the axial direction by elastic deformation with the end on the outer diameter side as a fulcrum.

The main body portion 51 has a Kafusa holding portion 54 which is spaced a predetermined gap distance S ₅ along three or middle portion 53 and the axial direction. The cuff carrier holding portion 54 has a height H ₅ along the axial direction and a width W ₅ along the circumferential direction. In the initial state, the claw portion 52 has a shape projecting into the gap spacing S _5. In other words, the gap distance between the tip and Kafusa holding portion 54 of the claw portion 52 is smaller than S _5.

  The main body 51 has a recess 56 provided on the outer diameter side of the stator core 12 with respect to the cuffer holding portion 54 and facing the axial end of the stator core 12. The recess 56 has a hollow shape that matches the cross-sectional shape of the lead wire 28. In the example of FIG. 2, the cross-sectional shape of the lead wire 28 is circular, and has a hollow shape that matches the curvature of the radius R of the circle.

  As the fixing member 50, a member molded into a predetermined shape using a resin material can be used. As the resin material, an epoxy resin, a polycarbonate resin, or the like can be used.

  FIG. 3 is a diagram illustrating the configuration of the cuff member 30 and the attachment relationship between the cuff member 30 and the fixing member 50. FIG. 3A is a view showing a state in which one fixing member 50 is attached to the cuff member 30 and the second fixing member 50 is not yet attached, and FIG. It is a figure which shows the fixing member 50 of this state, and (c) is a figure which shows the dimensional relationship of the insertion opening part.

  The cuff 30 includes an outer diameter side annular portion 32, an inner diameter side annular portion 34, a plurality of bank portions 36 connecting the outer diameter side annular portion 32 and the inner diameter side annular portion 34, and adjacent bank portions 36. It is an annular member configured to include a plurality of openings 38 provided therebetween. The bank portion 36 has a shape corresponding to the shape of the teeth 16 of the stator core 12, and the opening portion 38 has a shape corresponding to the slot 18 of the stator core 12. Therefore, the number of bank portions 36 is the same as the number of teeth 16 of the stator core 12, and the number of openings 38 is the same as the number of slots 18 of the stator core 12.

Among the plurality of bank portions 36, several bank portions 37 have a shape extending further toward the outer diameter side than the other bank portions 36. In FIG. 3, two bank portions 37 extending toward the outer diameter side from the other bank portions 36 are shown. The portion extending to the outer diameter side of the bank portion 37 into which the fixing member 50 is not fitted will be described. The insertion opening 42 is provided from the outer diameter side end portion of the bank portion 37 toward the inner diameter side. Assuming that the opening height along the axial direction is H ₃ and the opening width along the circumferential direction is W ₃ with respect to the dimension of the insertion opening 42, the opening height H ₃ is the height of the cuff member holding portion 54 of the fixing member 50. are smaller set than H ₅ is, the opening width W ₃ being is set smaller than the width W ₅ of Kafusa holding portion 54. “Small” means that the cuffer holding portion 54 of the fixing member 50 can be inserted into the opening of the insertion opening 42. For example, the dimensional difference is set to about 0.1 mm.

The fitting portion 40 is an opening hole penetrating from the upper surface portion of the bank portion 37 toward the ceiling portion of the insertion opening portion 42 in a portion extending to the outer diameter side of the bank portion 37. The length along the axial direction from the upper surface portion to the ceiling portion of the insertion opening is the length along the axial direction of the fitting portion 40 which is a through hole. When this fitting portion hole length is S ₃ , the fitting portion hole length S _S is the gap distance along the axial direction between the three-pronged middle portion 53 of the fixing member 50 and the cuff member holding portion 54. It is smaller set than the S _5. In this case, “smaller” means that when the distal end portion on the inner diameter side of the fixing member 50 is inserted into the opening of the insertion opening 42, the three middle portions 53 of the fixing member 50 are elastically deformed and the claw portion 52 is elastically deformed. Rides on the top surface of the bank portion 37, and when the distal end portion of the fixing member 50 is further pushed into the inner diameter side of the cuff member 30, the claw portion 52 is fitted into the fitting portion 40 and returns to the natural state. It is set to such an extent that the joint portion 40 is engaged and the fixing member 50 and the cuff member 30 are fixed to each other. When the fitting portion hole length S _S is larger than the gap interval S ₅ , the claw portion 52 and the fitting portion 40 are not engaged with each other, and the fixing member 50 and the cuff member 30 are not fixed to each other. The engagement between the claw portion 52 and the fitting portion 40 can be, for example, about 1 mm to 2 mm.

  The cuff 30 is positioned so that the positions of the plurality of openings 38 are aligned with the positions of the plurality of slots 18 of the stator core 12, and is fixed to the stator core 12 by an appropriate fixing means. The cuff member 30 can be formed by using a resin material and molded into a predetermined shape. As the resin material, an epoxy resin, a polycarbonate resin, or the like can be used.

FIG. 4 is a cross-sectional view taken along the line BB ′ in FIG. 3 and shows a fixed state of the cuff 30 and the fixing member 50. In FIG. 4, the fixing member 50 is inserted into the insertion opening 42 of the bank portion 37 from the outer diameter side to the inner diameter side of the bank portion 37 of the cuff member 30, and the claw portion 52 is fitted into the fitting portion 40. The state where the portion 52 and the fitting portion 40 are engaged with each other and the fixing member 50 and the cuff member 30 are fixed to each other is shown. In this state, the height H ₅ of the cuff member holding portion 54 of the fixing member 50 corresponds to the opening height H ₃ of the insertion opening portion 42 of the cuff member 30, and the three-pronged middle portion 53 of the fixing member 50 and the cuff member holding portion. The gap interval S ₅ with respect to 54 corresponds to the fitting hole length S ₃ of the cuff member 30.

When the fixing member 50 is thus fixed to the stator core 12 via the cuff 30, the lead wire 28 is accommodated between the concave portion 56 of the fixing member 50 and the axial end portion of the stator core 12. Here, the maximum gap between the main body portion 51 and the stator core 12 of the fixed member 50 as S _35, by setting smaller than the minimum dimension D of the outer径断surface of maximum gap S ₃₅ the lead wire 28, lead wire 28 can be prevented from coming off from the recessed portion 56 of the fixing member 50.

  In this way, by appropriately setting the dimensional relationship between the cuff 30 and the fixing member 50, the lead wire 28 of the temperature sensor can be fixed to the stator 10 with a simple structure and can be detached even by vibrations of the rotating electrical machine. Can be fixed stably.

    10 (rotary electric machine) stator, 12 stator core, 14 base portion, 16 teeth, 18 slots, 20 (each phase) coil, 22, 24 coil end, 26 each phase terminal, 28 lead wire, 30 (component) cuff, 32 Annular portion on the outer diameter side, 34 annular portion on the inner diameter side, 36, 37 bank portion, 38 opening portion, 40 fitting portion, 42 insertion opening portion, 50 fixing member, 51 main body portion, 52 claw portion, 53 (fixing member (3) of the middle part, 54 cuff holding part, 56 concave part.

Claims (1)

A stator core having an annular base portion and a plurality of teeth protruding from the base portion toward the inner diameter side;
An annular cuff that is disposed over the axial end surface of the stator core and is made of an insulating material having a plurality of openings through which the coil passes corresponding to a plurality of slots that are spaces between adjacent teeth;
A cuff that holds the coil end protruding in the axial direction of the stator core;
A fixing member that includes a claw portion that is fixed to the fitting portion, and a main body portion that protrudes from the claw portion to the outer diameter side of the stator core and has a recess on a surface facing the axial end portion of the stator core, and is made of an insulating material;
And a lead wire is accommodated between the recessed portion of the fixing member and the axial end portion of the stator core.

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