JP5683296B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine including a stator in which each tooth that defines a slot in which a stator winding is wound is insulated.

  Conventionally, a stator in which a stator winding is wound in a slot extending in the axial direction of the stator core, and a rotating magnetic field generated in the stator winding provided inside the stator in the radial direction are synchronized with the stator. There is known a rotating electric machine including a rotating rotor and an insulating film provided between a stator winding and a stator core (see, for example, Patent Document 1).

JP-A-2-156605 (FIG. 7)

In recent years, elevator hoisting motors, which are rotating electrical machines, have been demanded for energy saving and small size and high performance, and accordingly, they have become compatible with high currents and high voltages.
The hoisting motor is driven by PWM (Pulse Width Modulation) inverter control, and in recent years, a switching element having a large current and a high voltage has been applied.
If a high voltage (inverter surge voltage) generated by such a PWM inverter controlled switching element is repeatedly superimposed on the stator winding in a short cycle, the motor insulation system is seriously affected.
In the conventional elevator hoisting motor, the insulating film of Patent Document 1 is applied to each tooth defining the slot, so that partial discharge does not occur below the inverter surge voltage applied to the motor, improving the ground insulation performance However, there was a problem that workability was poor.

  It is an object of the present invention to solve the above-described problems, and an object of the present invention is to obtain a rotating electrical machine that can significantly reduce the work time for insulating each tooth. To do.

The rotating electrical machine according to the present invention includes a stator in which a stator winding is wound in a slot extending in the axial direction of the stator core, and the stator winding provided inside or outside in the radial direction of the stator. A rotating electric machine including a rotor that rotates in synchronization with a rotating magnetic field generated in
Each tooth that defines the slot is covered with a pair of insulators fitted from both sides in the axial direction, and an insulator provided in a space between the pair of insulators so as to be locked to the insulator .
The insulator is provided on the root side of the teeth and extends in the axial direction so as to sandwich the teeth, and the tip extension provided on the tip side of the teeth and extending in the axial direction so as to cover the tip of the teeth. And
One of a convex portion or a hole portion is formed at the tip portion of the root extension portion, and the other end of the convex portion or the hole portion that is locked to the convex portion or the hole portion is formed in the insulator,
In addition, a gap is formed between the tip extension portion and the teeth by a step portion formed at an intermediate portion, and a corner portion of the insulator is loosely inserted into the gap .

  According to the rotating electrical machine according to the present invention, each tooth is covered with a pair of insulators fitted from both sides in the axial direction, and an insulator provided in a gap portion between the pair of insulators so as to be engaged with the insulator. As a result, the work time for insulating each tooth can be greatly shortened.

It is principal part sectional drawing (the insulator and the insulator are abbreviate | omitted) which show the hoisting motor for elevators of Embodiment 1 of this invention. It is arrow sectional drawing along the II-II line | wire of FIG. It is a fragmentary perspective view which shows the principal part of the stator of FIG. It is a perspective view which shows the insulator of FIG. It is a perspective view which shows the insulator of FIG. FIG. 6A to FIG. 6C are diagrams showing a procedure for assembling the insulator to the teeth.

Embodiment 1 FIG.
Hereinafter, an elevator hoist motor (hereinafter abbreviated as a motor) according to Embodiment 1 of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view of an essential part showing the motor, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG. However, the insulator and the insulator are omitted.
The motor, which is a rotating electrical machine, has a bowl shape and has an outer frame 1 having a central shaft portion 8 protruding in the axial direction at the center portion, a stator 2 fixed to the inner wall surface of the outer frame 1, and the stator. 2 and a rotor 3 that is rotatably provided on a central shaft portion 8 via a bearing 9.

The stator 2 is configured by laminating thin steel plates, and has a stator core 5 having a plurality of slots 13 formed in the axial direction at intervals in the circumferential direction, and leads in each slot 13. And a stator winding 6 formed by winding along the axial direction. The stator core 5 includes an annular core back 17 and teeth 7 that protrude from the core back 17 toward the inner diameter side and define the slots 13.
The rotor 3 includes a rotor main body 11 having a protruding portion 16 whose central portion protrudes along the axial direction, and a permanent magnet 10 fixed to the outer peripheral wall surface of the rotor main body 11.
Reference numeral 14 denotes a phase ring, and reference numeral 15 denotes a cover that covers the opening side of the outer frame 1.

FIG. 3 is a perspective view showing a main part of the stator 2 of FIG.
Insulators 20 shown in FIG. 4 are fitted to both ends of each tooth 7 in the axial direction on the stator core 5 of the stator 2. Moreover, the insulator 21 which is the same material as the insulator 20 shown in FIG. 5 is provided in the space | gap part between a pair of insulators 20 for improving the ground insulation performance.
In the insulator 20, a root extension 22 extending in the axial direction so as to sandwich the tooth 7 is formed on the root side (core back 17 side) of the tooth 7. In addition, a guide body 25 is provided that functions as a guide for the conductor when the conductor of the stator winding 6 is wound around the teeth 7 between the pair of root extensions 22.
Convex portions 26 are formed at the tips of the pair of root extension portions 22, respectively. A tip extension 23 extending in the axial direction so as to cover the tip of the tooth 7 is formed on the tip of the tooth 7 (on the side opposite to the core back 17). Further, each of the pair of tip extension portions 23 is formed with a stepped portion 29 at an intermediate portion. The width of the step portion 29 is larger than the plate thickness of the insulator 21.

The insulator 21 is provided with a hole 27 into which the convex portion 26 of the insulator 20 is inserted on both sides in the axial direction on the base side of the tooth 7. The hole 27 has a long hole shape extending in the axial direction so as to absorb a dimensional error in the axial direction of the stator core 5.
On the distal end side of the tooth 7, a bent portion 30 is formed that is bent and extended in the circumferential direction up to the circumferential width dimension of the distal end extension portion 23.

FIG. 6A to FIG. 6C are diagrams showing a procedure for assembling the insulator 21 of FIG. 4 into the gap portion between the pair of insulators 20.
Insulators 20 are fitted into the teeth 7 of the stator core 5 from both sides in the axial direction (FIG. 6A).
Next, the insulator 21 is inserted into the gap 24 formed by the step portions 29 at both lower ends (FIG. 6B).
Finally, the portion indicated by the arrow A of the insulator 21 is pressed, the convex portion 26 of the insulator 20 is loosely inserted into the hole portion 27 of the insulator 21, and the insulator 21 is attached to the gap portion between the insulators 20 (FIG. 6 ( c)).
Since the insulator 20 and the insulator 21 are made of resin and have elasticity, the insulator 21 is elastically deformed when the insulator 21 is attached, but after the attachment, the insulator 21 returns to the state before the deformation. There will be no departure.

  The motor is provided with a pair of opposed brakes 12 that contact the inner wall surface of the rotor body 11 and brake the rotation of the rotor 3. A sheave 4 around which a rope (not shown) is wound is fixed to the bottom surface of the rotor body 11 on the side opposite to the opening.

The motor configured as described above releases the braking by the brake 12 and causes a current to flow through the stator winding 6 to generate a rotating magnetic field. In conjunction with this rotating magnetic field, the rotor 3 and the rope integral with the rotor 3 are integrated. The car 4 rotates.
A cage and a counterweight are suspended from the rope wound around the sheave 4, and the cage and the counterweight are lifted and lowered in a vine manner as the sheave 4 rotates.
In addition, the car and the counterweight are stopped and held by cutting off the energization of the motor and braking the brake 12.

  As described above, according to the motor according to this embodiment, each tooth 7 defining the slot 13 includes the pair of insulators 20 fitted from both sides in the axial direction, and the gap portion between the pair of insulators 20. Since the teeth 7 are covered with the insulator 21 that is locked to the insulator 20, the teeth 7 are reliably insulated, and the working time required for the insulation is greatly reduced.

Further, since the insulator 20 and the insulator 21 are made of the same material, insulation in the axial direction between the tooth 7 and the stator winding 6 can be made uniform.
Further, there is an advantage in management of materials of the insulator 20 and the insulator 21.

  The insulator 20 is provided on the root side of the tooth 7 and extends in the axial direction so as to sandwich the tooth 7, and the insulator 20 is provided on the distal end side of the tooth 7 to cover the distal end portion of the tooth 7 in the axial direction. Since the tip extension portion 23 extends to the teeth 7, the root side and the tip side of the teeth 7 are reliably and quickly insulated.

  Further, a convex portion 26 that is engaged with the hole portion 27 of the insulator 21 is formed at the distal end portion of the root extension portion 22, and the teeth 7 are formed on the distal end extension portion 23 by a step portion 29 formed at the intermediate portion. Is formed, and the corners of the insulator 21 are loosely inserted into the gap 24. Therefore, the insulator 21 can be easily attached to the insulator 20 with a simple configuration. Automation of work is also possible.

  Further, since the hole portion 27 of the insulator 21 has a long hole shape extending in the axial direction of the stator core 5, the dimensional tolerance in the axial direction of the stator core 5 is absorbed, and the insulator 21 is securely attached to the insulator 20. Can be installed on.

In addition, although the motor of said embodiment was an elevator hoisting motor, this invention is not limited to this motor, It can apply also to a generator.
Further, the rotor 3 is not limited to the one having the permanent magnet 10 and may be one in which a conducting wire is wound around the rotor body.
Moreover, a hole part may be formed in the front-end | tip part of a root extension part, and the convex part loosely inserted in this hole part may be formed in an insulator.
The present invention can also be applied to a rotating electrical machine in which a rotor is provided on the outer side in the radial direction of the stator.

  1 outer frame, 2 stator, 3 rotor, 4 sheave, 5 stator core, 6 stator winding, 7 teeth, 8 central shaft, 9 bearing, 10 permanent magnet, 11 rotor body, 12 brake, 13 slots, 14 phase rings, 15 covers, 16 protrusions, 17 core backs, 20 insulators, 21 insulators, 22 root extensions, 23 tip extensions, 24 gaps, 25 guides, 26 protrusions, 27 holes, 29 steps, 30 bends.

Claims (4)

A stator in which a stator winding is wound in a slot extending in the axial direction of the stator core;
A rotating electrical machine including a rotor that is provided inside or outside in a radial direction of the stator and that rotates in synchronization with a rotating magnetic field generated in the stator winding,
Each tooth that defines the slot is covered with a pair of insulators fitted from both sides in the axial direction, and an insulator provided in a space between the pair of insulators so as to be locked to the insulator .
The insulator is provided on the root side of the teeth and extends in the axial direction so as to sandwich the teeth, and the tip extension provided on the tip side of the teeth and extending in the axial direction so as to cover the tip of the teeth. And
One of a convex portion or a hole portion is formed at the tip portion of the root extension portion, and the other end of the convex portion or the hole portion that is locked to the convex portion or the hole portion is formed in the insulator,
Further, a rotation is characterized in that a gap is formed between the tip extension portion and the teeth by a step portion formed at an intermediate portion, and a corner portion of the insulator is loosely inserted into the gap. Electric.   The rotating electrical machine according to claim 1, wherein the insulator and the insulator are made of the same material. The hole is rotating electric machine according to claim 1 or 2, characterized in that a long hole shape extending in the axial direction. The rotating electrical machine according to any one of claims 1 to 3 , wherein the rotating electrical machine is an elevator hoisting motor.

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