JP5044142B2 - Stator coil insulation structure for rotating electrical machines - Google Patents

Description

  The present invention relates to a stator coil insulation structure for a rotating electrical machine in which a cylindrical insulating ring is inserted into a stator coil end portion of the rotating electrical machine to insulate an outer periphery of a bearing housing or between rotors with a ring-shaped insulator.

Conventionally, a stator coil insulation structure of this type of rotating electrical machine is, for example, as shown in FIG. In the motor housing 100, the stator 101 and the rotor 102 are concentrically arranged. The stator 101 includes a stator core 103 and a stator coil 104, and a coil end portion 104a of the stator coil 104 extends between the inner surface of the motor housing 100 and the outer peripheral surface of the bearing housing 100a. The coil end portion 104a is disposed so as to provide an insulating space 105 between the coil end portion 104a and the bearing housing 100a.
In general, the coil end portion 104a, the outer periphery of the bearing housing 100a, and the rotor 102 are insulated from each other by forming the coil end portion 104a in an arbitrary dimension.

  However, in such a conventional stator coil insulation structure of a rotating electrical machine, in order to secure an insulation distance from the coil end portion 104a, the molding is tightened or the coil peripheral length is lengthened. The design may be severe in terms of characteristics. In addition, there is a problem that the motor size is increased by securing the insulation distance.

Therefore, as shown in FIG. 9, a prior art (Patent Document 1) is known in which the coil end portion protection cap 106 is covered on the coil end portion 104a of the stator coil 104 to maintain insulation from the surroundings.
JP-A-6-261480

  However, according to the above prior art, in order to manufacture the coil end part protective cap 106 molded from resin, the coil end part protective cap 106 must be manufactured for each size of the electric motor, and thus a large number of molds are required. There is a problem that it becomes expensive.

  The present invention solves such a conventional problem, and insulates the inner diameter side of the stator coil end portion of the rotating electrical machine with a cylindrical insulator formed of an insulating material, so that the coil end portion for each size of the motor is obtained. It is an object of the present invention to provide a stator coil insulation structure for a rotating electrical machine that can improve economy and reduce stress on a coil because it is not necessary to manufacture a protective cap.

In order to solve the above-mentioned problems, the present invention incorporates in a motor housing a cylindrical stator in which a stator coil is disposed on a stator core, and a rotor concentrically disposed on the axis of the stator. The rotary shaft of the rotor is supported through a bearing provided in the bearing housing on the end face, and engaging portions that are engaged with each other are provided at both ends of the elongated strip 21 formed of a film-like insulating film. The belt-like body 21 is rounded, the engaging portion is engaged to form the insulating film into a cylindrical body, and the cylindrical insulator 20 formed of this insulating material is used as the inner periphery of the stator coil end portion. in the stator coil insulation structure of the rotary electric machine which is inserted on the side, on one side 21a of the strip 21, a predetermined length of the leg portion 22a~22e are integrally molded at regular intervals, One end of the belt-like body 21 on the other side 21b side is provided with a projecting piece 23 that extends along the edge of the belt-like body 21 toward the other side 21b of the belt-like body 21. A cutout 24 is formed as the engaging portion, and a cutout portion 25 is formed on the other end 21b side of the strip 21 as the engaging portion for engaging the cutout 24. At the tip of the leg portion 22a on the side where the portion 25 is formed, a notch 26 is formed as the engaging portion along the longitudinal direction of the leg portion 22a, and the leg portion 22e on the side where the protruding piece 23 is formed. A cutout portion 27 is formed as the engagement portion at the side edge of the cutout portion 27, and a cutout 28 is formed at the back of the cutout portion 27 as the engagement portion toward the distal end of the leg portion 22a. The notch 24 of the projecting piece 23 is engaged with the notch 25 and the leg 2 The a notch 26 is engaged with the notch 28 of the leg portion 22e constitutes the cylindrical insulator 20, inserting the cylindrical insulator 20 the legs 22a~22e the slot portion of the stator Thus, the cylindrical insulator 20 is inserted into the inner peripheral surface side of the stator coil end portion and assembled.

According to the present invention , molding of the coil end portion can be eased and stress on the coil can be reduced, so that quality can be improved. Furthermore, since the circumference of the coil can be shortened, the characteristics can be improved. Furthermore, the motor can be made compact, and it is not necessary to manufacture dedicated parts by resin molding or the like, so it is inexpensive. Further, the insulating ring can be easily assembled.

  Hereinafter, the illustrated embodiment will be described in detail with reference to the drawings.

  FIG. 1 is a partial cross-sectional view showing a stator coil insulation structure of a rotating electrical machine according to an embodiment of the present invention. 1 is a motor housing, 2 is a flange, and a stator 3 and a rotor 4 are concentrically arranged in the motor housing 1. Has been placed. A cylindrical bearing housing 5 is provided on the inner end surface of the motor housing 1, and a bearing 7 that supports one end of the motor shaft 6 provided in the rotor 4 is incorporated in the bearing housing 5. Yes. A cylindrical bearing housing 8 is also provided on the inner surface side of the flange 2, and supports the other end output side 6 a of the motor shaft 6.

  The stator 3 is obtained by assembling a stator coil 10 to a stator core 9, and a coil end portion 10 a of the stator coil 10 is arranged to extend to the outer peripheral side 5 a of the bearing housing 5. As shown in FIG. 2, the stator coil 10 is sequentially inserted into the slot 9 a of the stator core 9 along the circumferential direction, and is arranged on the inner peripheral side of the coil end portion 10 a with the coil end portion 10 a. A cylindrical insulator 20 formed of an insulating material that insulates the outer peripheral side 5a of the bearing housing 5 or the outer peripheral surface of the rotor 4 is inserted.

As shown in FIGS. 3 to 5, the cylindrical insulator 20 is formed by forming an elongated strip 21 formed of a resin material into a cylindrical shape. One side 21 a of the strip 21 has a certain length. The leg portions 22a to 22e are integrally formed at regular intervals. Further, a triangular projecting piece 23 projects from one end of the band-like body 21 on the other side 21b side. A cutout 24 is formed in the projecting piece 23 along the edge of the band-like body 21 toward the other side 21b of the band-like body 21, and a triangular notch 25 for engaging the cutout 24 has a band-like shape. It is formed on the other end side of the other side 21 b of the body 21.
The leg portions 22a and 22e at both ends are formed at both ends of the belt-like body 21, respectively, and a notch 26 is cut along the longitudinal direction of the leg portion 22a at the tip of the leg portion 22a on the side where the notch 25 is formed. And a notch 27 is formed at the side edge of the leg 22e on the side where the protrusion 23 is formed. At the back of the notch 27, a cut 28 is formed toward the distal end of the leg 22a.
The cutout portion 25 and the cutout portion 27 of the belt-like body 21 are provided at the coil end portion 10 a, the outer periphery of the bearing housing 5, and a location that does not affect the insulation of the rotor 4.

  In the cylindrical insulator 20, the belt-like body 21 is rounded, both ends are butted as shown in FIG. 6, the notch 24 of the projecting piece 23 is engaged with the notch 25, and the notch 26 of the leg 22a is engaged with the leg 26a. It is assembled by engaging with the notch 28 of the portion 22e.

  The cylindrical insulator 20 is assembled by inserting the leg portions 22a to 22e into the slot 9a of the stator core 9 and inserting it into the inner peripheral side of the coil end portion 10a.

  According to the stator coil insulation structure of the rotating electrical machine, the strip-like body 21 is rounded to form the cylindrical insulator 20, and this cylindrical insulator 20 is inserted into the inner peripheral side of the coil end portion 10a. The coil end portion 10a is insulated from the outer peripheral side 5a of the bearing housing 5 or the outer peripheral surface of the rotor 4. By inserting the leg portions 22a to 22e into the slots 9a of the stator core 9 and holding them, the tubular insulator 20 is prevented from coming off and misaligned.

As described above, according to the above-described embodiment, since the cylindrical insulator 20 formed of an insulating material is inserted into the inner peripheral surface side of the coil end portion 10a of the stator coil 10, the coil end portion 10a Since the molding can be relaxed and the stress on the coil can be reduced, the quality can be improved. Furthermore, since the circumference of the coil can be shortened, the characteristics can be improved.
Since the cylindrical insulator 20 is formed by rolling a film-like insulating film into a cylindrical body, it is not necessary to manufacture a dedicated part by resin molding or the like, and is inexpensive.
The cylindrical insulator 20 is provided with notches 24 and notches 25 and notches 26 and 28 that engage with each other at both ends of the insulating film, and these notches 24 and notches 25 and notches 26 and 28 are provided. Since the insulating film is formed into a cylindrical body by being engaged with each other, it is possible to assemble in a separate process in advance, so that productivity is good. In addition, the motor can be made compact, and it is not necessary to manufacture dedicated parts by resin molding or the like, so that it is inexpensive.
A plurality of leg portions 22a to 22e to be inserted into the slot portion of the stator 3 are provided at one end of the cylindrical insulator 20, and the leg portions 22a to 22e are inserted into the slot portion of the stator to connect the insulating ring to the stator. Since it was inserted in the inner peripheral surface side of the coil end part 10a, the cylindrical insulator 20 can be easily assembled.

The present invention is not limited only to the above-described embodiment. For example, the insulating film constituting the insulator 20 is provided with the notches 24, 25, 26, and 28 that are engaged with each other. You may fix with an adhesive agent and a tape so that it may not come apart when it is rolled. Further, the leg portions 22 (22a to 22e) are provided with wedge-shaped projections 29 as shown in FIG. 7 along the side edges, so that the leg portions 22 (22a to 22e) can be prevented from coming off when assembled to the slots 9a of the stator core 9. it can.
Further, depending on the position and shape of the leg portions 22a to 22e, it can be shared with a stator having a different slot. For example, when four leg portions 22a to 22e are provided, it is possible to cope with stators of 12, 16, and 24 slots. Further, it can be shared with a stator having a different number of slots depending on the position, quantity, shape and size of the leg portions 22 (22a to 22e) to be inserted into the slot 9a. In addition, it goes without saying that the present invention can be appropriately changed and implemented within the scope not changing the gist of the present invention.

It is a fragmentary sectional view of the motor which shows the stator coil insulation structure of the rotary electric machine by embodiment of this invention. It is a perspective view which shows the stator which assembled | attached the cylindrical insulator to the coil end part of the stator coil of FIG. It is a perspective view which shows the state which assembled | attached the leg part of the cylindrical insulator of FIG. 2 to the slot of the stator core. It is a perspective view which shows the cylindrical insulator of FIG. It is a front view which shows the strip | belt-shaped body which forms the cylindrical insulator of FIG. It is a front view which shows the engaging part of the both ends of the strip | belt-shaped body of FIG. It is a front view which shows the modification of the leg part of the cylindrical insulator of FIG. It is a fragmentary sectional view of the motor which shows the stator coil insulation structure of the conventional rotary electric machine. It is a fragmentary sectional view of the motor which shows the stator coil insulation structure of the conventional rotary electric machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Motor housing 2 Flange 3 Stator 4 Rotor 5 Bearing housing 6 Motor shaft 7 Bearing 8 Bearing housing 9 Stator core 10 Stator coil 10a Coil end part 20 Insulator 21 Band-like body 22a-22e Leg part 23 Projection piece 24, 26, 28 Notch 25 , 27 Notch

Claims (1)

A cylindrical stator in which a stator coil is disposed on a stator core, and a rotor concentrically arranged on the axis of the stator are incorporated in a motor housing, and the bearing is provided on the bearing housing on the end face of the motor housing. In addition to supporting the rotating shaft of the rotor and providing engaging portions that engage with each other at both ends of the elongated strip 21 formed of a film-like insulating film, the strip 21 is rolled up to form the engaging portion The insulating film is formed into a cylindrical body, and the cylindrical insulator 20 formed of this insulating material is inserted into the inner peripheral surface side of the stator coil end portion. In structure
Legs 22a to 22e having a predetermined length are integrally formed at one side 21a of the belt-like body 21 at a constant interval, and a projecting piece 23 projects from one end on the other side 21b side of the belt-like body 21. The protrusion 23 is formed with a cut 24 as the engaging portion along the edge of the band 21 toward the other side 21b of the band 21 and the engagement with which the cut 24 is engaged. A notch portion 25 is formed on the other end 21b side of the belt-like body 21 as a portion, and the longitudinal direction of the leg portion 22a is at the tip of the leg portion 22a on the side where the notch portion 25 is formed. A notch 26 is formed as the engaging portion along the side, and a notch 27 is formed as the engaging portion on the side edge of the leg portion 22e on the side where the protruding piece 23 is formed. 27 is cut as the engaging portion toward the distal end of the leg portion 22a. A notch 28 is formed, the notch 24 of the projecting piece 23 is engaged with the notch 25, and the notch 26 of the leg 22a is engaged with the notch 28 of the leg 22e to thereby form the cylindrical insulator. 20 and holding the cylindrical insulator 20 by inserting the leg portions 22a to 22e into the slot portions of the stator, thereby holding the cylindrical insulator 20 in the inner peripheral surface of the stator coil end portion. A stator coil insulation structure for a rotating electrical machine, wherein the stator coil insulation structure is inserted into the side and assembled.

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