JP2017038420A - Rotary electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary electric machine capable of further facilitating assembly of a stator to a motor case.SOLUTION: A rotary electric machine 10 includes a rotor 12, a stator 14, and a motor case 16 that rotatably supports the rotor and accommodates the stator 14 therein. The stator 14 comprises: a stator core 24; a cuff support 28 fixed to the stator core 24; and a stator coil 26 wound around core teeth 30 of the stator core 24 and the cuff support 28. The cuff support 28 includes: a main body part 34 arranged on one end surface in an axial direction of the stator core 24; and a cylinder part 36 that extends from an outer peripheral edge of the main body part 34 in the axial direction, and on whose outer surface the motor case 16 is fitted. At an end part of the cylinder part 36, a taper is provided.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a rotating electrical machine, and more particularly to a rotating electrical machine in which a cuff is installed on an axial end surface of a stator core.

  As is well known, the rotating electrical machine includes a stator, a rotor, and a case for housing them. Among these, in order to improve the workability of the winding operation of the stator coil, the stator may arrange a part called a cuffer on the axial end surface of the stator core. Patent Document 1 discloses a stator in which a cuff is disposed.

  The cuffs disclosed in Patent Document 1 have a plurality of cuff sates, and an outer annular part and an inner annular part that connect the plurality of cuff sates. The plurality of cuff teeth are arranged on the corresponding stator core teeth (hereinafter referred to as “core teeth” in order to be distinguished from the cuff teeth). The cuff has a plurality of protrusions, and the cuff is fixed to the stator core by fitting the protrusions into the plurality of slots.

JP 2007-31549 A

  Such a stator is usually inserted and fixed in a substantially cylindrical motor case. At the time of this insertion, if the outer diameter of the stator core is substantially the same as the inner diameter of the motor case, there is a problem that it becomes difficult to insert the stator core. On the other hand, if the outer diameter of the stator core is sufficiently small compared to the inner diameter of the motor case, the coaxiality between the stator core and the motor case tends to be low after the stator core is inserted into the motor case, and the shaft center needs to be adjusted separately. There was a problem of becoming. In other words, the conventional stator cannot be easily assembled to the motor case.

  Therefore, an object of the present invention is to provide a rotating electrical machine that can more easily assemble a stator to a motor case.

  The rotating electrical machine according to the present invention is a rotating electrical machine including a rotor, a stator, and a motor case that supports the rotor and accommodates the stator therein, and the stator is fixed to the stator core and the stator core. A stator coil wound around the stator core teeth and the cuff member, the cuff member being interposed between a coil end of the stator coil and one axial end surface of the stator core. A main body portion disposed on one axial end surface of the stator core, and a cylindrical portion extending in the axial direction from a peripheral edge of the main body portion and having the motor case fitted to an outer surface thereof, and an end of the cylindrical portion The portion is provided with a taper.

  According to the present invention, the cuff is provided with a cylindrical portion into which the motor case is fitted, and the cylindrical portion is provided with a taper. By providing such a taper, the insertability of the stator into the motor case is improved, and the stator can be easily assembled to the motor case.

It is a schematic longitudinal cross-sectional view of the rotary electric machine which is embodiment of this invention. It is a disassembled perspective view of a stator. It is the schematic which looked at the core teeth from the center. It is a schematic longitudinal cross-sectional view of another rotary electric machine. It is a schematic longitudinal cross-sectional view of another rotary electric machine. It is a schematic longitudinal cross-sectional view of the conventional rotary electric machine.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view of a rotating electrical machine 10 that is an embodiment of the present invention. FIG. 2 is an exploded perspective view of the stator 14. However, in FIG. 2, the stator coil 26 is not shown. FIG. 3 is a schematic view of the core teeth 30 around which the stator coil 26 is wound as viewed from the center side of the stator 14.

  The rotating electrical machine 10 includes a rotor 12, a stator 14, and a motor case. The rotor 12 includes a rotor core 18 and a permanent magnet (not shown) embedded in the rotor core 18. The rotor core 18 is a cylindrical member formed by laminating electromagnetic steel plates. At the center of the rotor core 18, the rotary shaft 20 is inserted and fixed. Both ends of the rotating shaft 20 are attached to the motor case 16 via bearings 22, and the rotating shaft 20 and the rotor core 18 fixed to the rotating shaft 20 are rotatable with respect to the motor case 16.

  The stator 14 includes a stator core 24, a stator coil 26, and a cuff member 28. The stator core 24 is a substantially cylindrical member arranged concentrically with the rotor 12, and includes an annular yoke 32 and a plurality of core teeth 30 protruding toward the inner peripheral side of the yoke 32. The plurality of core teeth 30 are arranged in the circumferential direction at a predetermined interval, and a slot into which the stator coil 26 is inserted is formed between two adjacent core teeth 30. In FIG. 2, only a part of the core teeth 30 is illustrated, but in reality, the core teeth 30 are arranged over the entire circumference at equal intervals. The stator core 24 is composed of a plurality of electromagnetic steel plates (for example, silicon steel plates) stacked in the axial direction. The plurality of electromagnetic steel sheets are positioned and joined to each other to constitute the stator core 24. Many methods for positioning and joining electromagnetic steel sheets have been proposed in the past. For example, each electromagnetic steel sheet is formed with a convex part and a concave part for caulking, and the convex part of one electromagnetic steel sheet is formed into a concave part of another electromagnetic steel sheet. The plurality of electromagnetic steel sheets may be positioned and combined with each other.

  The stator coil 26 has three-phase coils, that is, a U-phase coil, a V-phase coil, and a W-phase coil, and one end of each phase coil is connected to an input terminal (not shown). The other end is connected to a coil of another phase at a neutral point (not shown). Such a stator coil 26 is configured by winding a winding around a core tooth 30. The winding method may be concentrated winding or distributed winding. Further, the winding constituting the stator coil 26 may be a rectangular wire with a rectangular cross section or a round wire with a circular cross section as long as the periphery is covered with an insulator such as enamel.

  The cuff member 28 is a member made of an insulating material such as resin. The cuff 28 is disposed on one end surface of the stator core 24. The cuff member 28 is positioned with respect to the stator core 24 and fixed to the stator core 24. Various methods of fixing the cuff member 28 are conceivable. For example, a concave portion may be provided on one of the cuff member 28 and the stator core 24, and a convex portion may be provided on the other, and the concave and convex portions may be fitted to each other. The cuff member 28 includes a main body portion 34 disposed on one axial end surface of the stator core 24 and a cylindrical portion 36 extending in the axial direction from the outer peripheral edge of the main body portion 34. The main body 34 has a donut plate shape having substantially the same inner diameter as that of the stator core 24, and is interposed between the coil end of the stator coil 26 and the stator core 24. The main body 34 is further roughly divided into a plurality of cuff tees 38, an inner ring 40 that connects the inner peripheral ends of the plurality of cuff patties 38, and an outer ring 42 that connects the outer peripheral ends of the plurality of cuff patties 38. The

  The cuff teeth 38 are placed on the upper end surface of the core teeth 30 and are provided in the same number as the core teeth 30. In FIG. 2, only some of the cuff teeth 38 are illustrated, but the cuff teeth 38 are also arranged at equal intervals over the entire circumference, like the core teeth 30. As shown in FIG. 3, the cuffs 28 are positioned and installed such that the circumferential centers of the cuff teeth 38 coincide with the circumferential centers of the corresponding core teeth 30.

  Further, the cuff teeth 38 have a slightly larger width than the core teeth 30. Therefore, the cuff teeth 38 slightly protrude toward the slot side of the stator core 24, and the width of the opening formed between the two adjacent cuff teeth 38 is smaller than the slot width of the stator core 24. The winding is bent and wound with the corner portion of the cuff satisie 38 as a fulcrum.

  In the illustrated example of FIG. 3, the winding 27 a extending upward from the lower left side of the drawing is bent to the right with the left corner of the cuff satice 38 as a fulcrum, and the winding 27 b extending upward from the lower right side of the drawing is It is bent leftward with the corner as a fulcrum. When the winding is bent, in order to prevent damage to the coating material of the winding, the corner portion of the cuff satisie 38 is chamfered to form a gentle arc surface. Further, the cuff teeth 38 have a certain degree of strength so as to withstand the load received when winding the winding, and have a thickness of several mm or more, for example, 5 to 6 mm.

  The inner ring 40 is an annular body that connects the inner peripheral end portions of the plurality of cuff teeth 38. The inner ring 40 is slightly thinner than the cuff satis 38. The outer ring 42 is an annular body that connects the outer peripheral side ends of the plurality of cuff teeth 38. The bottom surface of the outer ring 42 is in the same plane as the bottom surface of the cuff satiece 38, and the outer ring 42 is placed on the end surface in the axial direction of the yoke 32 when the cuff satisie 38 is placed on the core tooth 30.

  A cylindrical portion 36 extends inward in the axial direction from the outer peripheral edge of the main body portion 34. The inner diameter of the cylindrical portion 36 is slightly larger than the outer diameter of the stator core 24. Therefore, the operation of inserting the stator core 24 into the cylindrical portion 36 can be performed relatively easily.

  Further, the outer diameter of the cylindrical portion 36 is substantially the same as the inner diameter of the lower case 48 described later, and the lower case 48 is fitted to the outer surface of the cylindrical portion 36. By inserting and fitting the cylindrical portion 36 into the lower case 48, the entire stator 14 including the cuff member 28 is concentrically fixed with respect to the lower case 48. In order to facilitate insertion into the lower case 48 of the cylindrical portion 36, the diameter of the cylindrical portion 36 near the tip (the end on the side away from the main body portion 34) is reduced as it approaches the tip. A taper is formed.

  The motor case 16 is made of a material having a certain degree of rigidity, such as aluminum, and includes a lower case 48 and an upper case 46. The lower case 48 is a substantially cylindrical member having a lower end closed and an upper end opened. The rotating shaft 20 is attached to the lower end surface of the lower case 48 via a bearing 22. As described above, the inner diameter of the lower case 48 is substantially the same as the outer diameter of the cylindrical portion 36 of the cuff member 28, and the cylindrical portion 36 of the cuff member 28 is fitted inside the lower case 48. .

  The upper case 46 is a substantially cylindrical member having a lower end opened and an upper end opened. The upper case 46 is connected to the lower case 48 via bolts or the like. The rotary shaft 20 is attached to the upper end surface of the upper case 46 via a bearing 22. Note that the inner diameter of the upper case 46 is sufficiently larger than the outer diameter of the cylindrical portion 36.

  Here, as is apparent from the above description, in the present embodiment, the cuff member 28 is provided with a cylindrical portion 36 extending in the axial direction, and the cylindrical portion 36 is further tapered. By adopting such a configuration, it is possible to more easily assemble the stator 14 to the motor case 16 as compared with the conventional case. This will be described in comparison with the prior art.

  FIG. 6 is a schematic longitudinal sectional view of a conventional rotating electrical machine 10. As shown in FIG. 6, also in the prior art, the stator 14 includes a stator core 24, a stator coil 26, and a cuff member 28. However, the conventional cuffer 28 has only a main body portion 34 disposed on one end surface of the stator core 24, and does not have a cylindrical portion 36 fitted to the outer periphery of the stator core 24. Therefore, in the prior art, the outer peripheral surface of the stator 14 is the outer peripheral surface of the stator core 24. The outer diameter of the stator 14 is sufficiently smaller than the inner diameter of the lower case 48, and a sufficient gap exists between the stator core 24 and the lower case 48.

  Here, in the rotating electrical machine 10, the rotor 12, the stator 14, and the motor case 16 must be assembled so as to be concentric. Therefore, conventionally, after inserting the stator 14 into the lower case 48, the axis is adjusted so that the stator 14 and the motor case 16 are concentric, and then the stator 14 is fixed to the lower case 48. It was. In other words, in the prior art, when the stator 14 is assembled to the motor case 16, in addition to the operation of inserting the stator 14 into the lower case 48, an axial center adjustment operation is required, and the manufacturing process is complicated. .

  In order to omit such an axial center adjustment operation, it is conceivable to make the outer diameter of the stator core 24 and the inner diameter of the lower case 48 substantially the same. In this case, when the stator core 24 is inserted into the lower case 48 and fitted, the position of the stator core 24 with respect to the lower case 48 is automatically adjusted, so that the shaft center adjustment work is not necessary. However, in this case, the stator core 24 has to be inserted (fitted) into the lower case 48 having substantially the same diameter, and there is a problem that the inserting operation is very difficult. Such a problem can be solved by providing a taper on the outer peripheral surface of the stator core 24, but it is difficult to provide a taper on the outer peripheral surface of the stator core 24 formed by laminating electromagnetic steel sheets.

  In order to solve such a problem, in the present embodiment, the cuff member 28 is provided with a cylindrical portion 36 having an outer diameter substantially the same as the inner diameter of the lower case 48, and the cylindrical portion 36 is tapered. In this case, if the stator 14 is inserted into the lower case 48 and the cylindrical portion 36 of the cuff 28 is fitted into the lower case 48, the position of the stator 14 with respect to the lower case 48 is automatically adjusted. Therefore, the shaft center adjustment work becomes unnecessary. In addition, since the cylindrical portion 36 is provided with a taper, it is possible to easily insert the cylindrical portion 36 into the lower case 48. That is, according to the present embodiment, the stator 14 can be easily inserted into the lower case 48, and further, the shaft center adjustment work is not required. .

  The configuration described so far is merely an example, and the other configuration is changed as long as the cuff 28 has the cylindrical portion 36 that fits into the lower case 48 and the cylindrical portion 36 is tapered. Also good. For example, as shown in FIG. 5, the upper end of the lower case 48 may be fitted into the tapered surface at the end of the cylindrical portion 36. Also in this case, if the lower case 48 is fitted to the tapered surface of the cylindrical portion 36, the position of the stator 14 with respect to the lower case 48 is automatically adjusted. Become. Further, since the cylindrical portion 36 is provided with a taper, it is possible to easily insert the stator 14 into the lower case 48.

  Further, as shown in FIG. 6, the cylindrical portion 36 may extend upward (in the axial direction) instead of downward. In this case, it is only necessary to form a taper at the base end (corner portion connecting the cylindrical portion 36 and the main body portion 34), not at the end of the cylindrical portion 36. The configuration of the motor case 16 described so far is also an example, and other configurations may be appropriately changed as long as the configuration can be fitted to the cylindrical portion 36 at least.

DESCRIPTION OF SYMBOLS 10 Rotating electrical machine, 12 Rotor, 14 Stator, 16 Motor case, 18 Rotor core, 20 Rotating shaft, 22 Bearing, 24 Stator core, 26 Stator coil, 27a, 27b Winding, 28 Cuffs, 30 Core teeth, 32 York, 34 Main part , 36 Cylindrical part, 38 cuff satis, 40 inner ring, 42 outer ring, 46 upper case, 48 lower case.

Claims (1)

A rotating electrical machine including a rotor, a stator, and a motor case that pivotally supports the rotor and accommodates the stator therein,
The stator is
A stator core;
Cuffs fixed to the stator core;
A stator coil wound around the teeth of the stator core and the cuff;
With
The cuffs are
A main body disposed on one axial end surface of the stator core so as to be interposed between a coil end of the stator coil and one axial end surface of the stator core;
A cylindrical portion that extends in the axial direction from the periphery of the main body, and the motor case is fitted to the outer surface thereof;
Including
The end of the cylindrical portion is provided with a taper,
Rotating electric machine characterized by that.

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