JP2000102228A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the secondary resistance of a secondary circuit by winding a tape-shaped metal plate with an insertion cut-out at each specific intervals for forming a rotor core with a plurality of slots and inserting a plurality of circular-plate-shaped rotor conductors into the slot of the rotor core for forming the rotor. SOLUTION: In an axial gap type motor, a rotor core 36 is made of copper plate or brass plate, is formed by winding a tape-shaped metal plate with insertion cut-outs at specific interval and is provided with slots 41 at each specific interval in a diameter direction. Then a plurality of fan-shaped openings 46 are formed in a diameter direction of a circular-plate-shaped rotor conductor 38, that is made of a plurality of iron plates and the like. Then, an opening 46 of the rotor conductor 38 is inserted and engaged into the slots 41 of the rotor core 36 to form a rotor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an AC motor.

[0002]

2. Description of the Related Art Conventionally, in a small induction type AC motor, a rotor iron core (secondary circuit) of a rotor is formed of an aluminum die-cast conductor. That is, the rotating conductor is manufactured by die-casting aluminum in a slot provided in the rotor core of the rotor, and forms a secondary circuit of the motor.

However, in order to improve the efficiency of such a motor, it is necessary to reduce the secondary resistance of a secondary circuit including a rotating conductor. However, the resistance of aluminum is relatively large,
Even if the shape of the rotating conductor is devised, there is a problem that there is a limit in reducing the secondary resistance.

In the case where a metal material having a resistance value smaller than that of aluminum, such as copper or brass, is used, the melting point of the metal material is relatively high even if it is to be manufactured as a rotating conductor to be die-cast. In fact, the production was difficult in consideration of the influence on the iron core.

[0005] In order to solve the above-mentioned problems, the present invention provides a motor which can reduce the secondary resistance and is easy to manufacture.

[0006]

According to a first aspect of the present invention, there is provided an axial gap type motor, wherein a rotor core is formed by winding a tape-shaped metal plate having a plurality of insertion notches at predetermined intervals. In addition, the insertion notch is also laminated to form a plurality of slots, and a disc-shaped rotor conductor is formed.
A rotor having a plurality of rotors inserted and laminated in the plurality of slots of the rotor core.

According to a second aspect of the present invention, in the first aspect, the tape-shaped metal plate is formed of a copper plate or a brass plate.

According to the motor of the first aspect, a stator core is formed by winding a tape-shaped metal plate, and a plurality of disk-shaped rotor conductors are inserted into slots of the stator core to be laminated. By doing so, a rotor can be manufactured.

Further, by forming the tape-shaped metal plate from a copper plate or a brass plate, the secondary resistance of the secondary circuit can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will now be described with reference to FIGS.
A description will be given based on FIG.

FIG. 1 is a longitudinal sectional view of a motor 10 according to the present embodiment, and FIG. 2 is a perspective view of a rotor 12.

As shown in FIG. 1, the motor 10 is an axial gap type motor. Here, the axial gap type motor will be described.

In a general motor, an air gap between a stator and a rotor is provided in a radial direction (longitudinal direction). On the other hand, since the stator and the rotor of an axial gap type motor (for example, a flat type motor) are arranged in the axial direction, the air gap between them is provided in the axial direction (axial direction). Have been. like this,
A motor provided with an air gap in the axial direction is called an axial gap type motor.

The structure of the motor 10 will be described with reference to FIGS.

The stator 14 of the motor 10 has a ring shape, and a coil 16 is wound around an inner peripheral portion and an outer peripheral portion thereof. The stator 14 is molded from a mold resin or the like, and is embedded in a resin frame 18.

A hollow portion 20 is formed in the inner peripheral portion of the resin frame 18 in the axial direction, and a rotary shaft 26 is disposed inside the hollow portion 20 via two bearings 22 and 24.

A rotor 30 as shown in FIG. 2 is attached to the rotation shaft 26 via a rotor frame 28. As described above, the rotor 30 and the stator 14 have the air gap formed in the axial direction.

As shown in FIG. 1, the rotor 30 is made of a metal cover 30 covered on the resin frame 18.
Are housed inside the motor 10.

Next, a method of manufacturing the rotor 12 and its structure will be described.

The rotor 12 includes a rotor core 36 wound with a tape-shaped metal plate 34 and a rotor conductor 38 made of metal.

Hereinafter, the manufacturing method will be described with reference to FIGS.
A description will be given based on FIG.

A tape-shaped metal plate 34 formed of a copper plate or a brass plate is punched out by a press, and a plurality of insertion notches 40 are formed at predetermined intervals as shown in FIG.

The tape-shaped metal plate 34 having the insertion notch 40 is wound as shown in FIG. In this case,
As described above, the inner peripheral portion is formed with the hollow portion 42 so that the rotation shaft 26 passes therethrough. In the tape-shaped metal plate 34 wound in this way, the insertion notches 40 are laminated at predetermined intervals in the radial direction to form the slots 41, as shown in FIG.

On the other hand, a disk-shaped rotor conductor 38 made of an iron plate or the like has a hollow portion 44 at the center thereof and a plurality of openings 46 formed in a fan shape in the radial direction. The opening 46 of the rotor conductor 38 is connected to the rotor core 3
6 are fitted into the slots 41 respectively. FIG. 5 shows this state.

The rotor 30 as shown in FIG. 2 is formed by fitting a plurality of rotor conductors 38 to the rotor core 36 in this manner.

In the case of the rotor as described above, a tape-shaped metal plate 34 is wound, and the rotor conductor 3
Since the rotor 30 can be manufactured only by inserting the rotor 8, the manufacturing is facilitated.

Further, since the rotor core 36 is formed of copper or brass having a low resistance value, the secondary resistance of the rotor 30 can be reduced. Therefore, the motor 10
Efficiency can be improved.

Further, by changing the number of rotor conductors 38 inserted into the rotor core 36, the secondary resistance can be easily changed.

[0029]

As described above, according to the motor of the present invention, the rotor can be easily manufactured and the secondary resistance can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a motor showing one embodiment of the present invention.

FIG. 2 is a perspective view of a rotor.

FIG. 3 is a perspective view of a tape-shaped metal plate.

FIG. 4 is a perspective view of a rotor core 36;

FIG. 5 is an exploded perspective view showing a state where a plurality of rotor conductors are about to be inserted into a rotor core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Motor 12 Rotor 14 Stator 26 Rotation axis 28 Rotor frame 30 Rotor 32 Cover 34 Metal plate 36 Rotor core 38 Rotor conductor 40 Insert notch 41 Slot

Claims (2)

[Claims] In an axial gap motor, a rotor core is formed by winding a tape-shaped metal plate having a plurality of insertion notches at predetermined intervals, and a plurality of slots are formed by laminating the insertion notches. A motor comprising: a rotor formed and laminated by inserting a plurality of disk-shaped rotor conductors into the plurality of slots of the rotor core. 2. The motor according to claim 1, wherein the tape-shaped metal plate is formed of a copper plate or a brass plate.