JPS59172961A - Axial air gap induction motor - Google Patents

Abstract

PURPOSE:To simplify and to enhance the performance of an axial air gap induction motor by disposing two sets of windings to be inserted into a stator core so that a downside coil inserted to the inner bottom side of the slots of the first and second motors corresponding to up and down sides as upper and lower coil pair. CONSTITUTION:The first and second rotors 10-A, 10-B are so arranged as to oppose to the stators on both end faces of a stator core 1. The windings 3-A, 3-B for driving the rotors 10-A, 10-B are formed of both downside and upside coils, and contained in the slots of the first and second motors formed substantially radially to the opposed surfaces of the rotors 10-A, 10-B. The downside coil inserted into the inner bottom of the slot of the windings 3-A, 3-B is arranged to correspond to the slots of the first and second motors at the upside and downside.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to axial air gap induction motors.

Conventional configuration and its problems 2, +:,, -'・ Conventionally, in so-called axial air gap induction motors, two motors were used, taking advantage of their structural characteristics of flatness and the flatness of the magnetic pole surfaces. Various applications have been proposed in which motors can be housed in a single housing and have more advanced functionality.

For example, as shown in Japanese Unexamined Patent Publication No. 56-34391, as a drive device for a dehydrating washing machine, a washing motor and a dehydrating motor share a stator core, and two sets of windings are connected to the stator core. There is a functionally excellent one-stator, two-coil, 20-torque axial air gap induction motor that has two sets of rotors facing each other.

Generally speaking, an axial air gap induction motor is made by inserting insulating paper into a stator core formed by winding iron plates, then pushing the windings and binding them with string to prevent the windings from shifting or deforming.
After the Hijisen treatment, it is molded with thermosetting resin to complete the stator unit.

Problems in this case include the exposure of the windings to the resin surface during resin molding, and the occurrence of layer shorts due to deformation of the windings due to resin pressure during stator unit molding.These problems occur only after the stator unit is molded. Since the problem is discovered, the stator unit cannot be reused in that case, resulting in extremely large cost losses.

In particular, in a configuration in which two coils are inserted into slots provided on both end faces of one stator core to form a stator unit, problems during unit formation are a greater problem than in the past.

The above-mentioned Japanese Patent Laid-Open Publication No. 56-34391 does not disclose any method for solving such problems, and therefore, a method for solving such problems has been long awaited.

OBJECT OF THE INVENTION The present invention solves these conventional problems and
By providing a 20-coil type axial gap induction motor with excellent functionality, it can be used as a drive device for a washing machine, for example, with higher functionality and a simpler structure, resulting in high quality and high reliability. The objective is to achieve this objective at a low cost.

Structure of the Invention In the axial air gap induction motor of the present invention, a tenth rotor and a second rotor are disposed on both end faces of a stator core formed by spirally winding an iron plate so as to face the stator, respectively. The rotor drive windings consist of both lower and upper coils, and are housed in the first motor slot and the second motor slot formed approximately radially on the surface of the stator core facing the rotor. Among the driving windings, the lower coil inserted into the inner bottom of the slot is arranged so as to correspond above and below to the slots of the first and second motors. .

DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, reference numeral 1 denotes a stator core formed by being spirally wound, and this is firmly fixed by a caulking pin 2, for example. 3-A and 3-B are windings stored in slots provided on both upper and lower end surfaces of the stator core 1, and are made of unsaturated polyester resin or the like together with sleeves 5 that hold the bearings 4-A and 4-B. are solidified into one body and constituted as a stator unit 6.

7-A and 7-B are rotor cores arranged to correspond to the magnetic pole faces of the stator 1, and are fixed by welding s-A and 5-Bl on the opposite side to the slots (not shown). There is no problem in terms of performance even if the beads protrude from the core surface.

9-A and 9-B are aluminum which are secondary conductors, and also serve as frames of the rotors 1o-A and 1o-B.

11-A and 11-B are shafts that support the rotors 10-A and 10-B, and are press-fitted and fixed to the rotors 1o-A and 1o-B. 12-A and 12-B are sheet metal frames;

Bearings 13-A and 13-B that rotate and hold 11-B together with bearings 4-A and 4-B are disposed in the center, and are fixed to the stator unit 6 by screws 14 or the like on the outer periphery thereof.

The windings of page 6 2゛3-A and 3-B are the lower and upper two coils 3-A-1゜3-A-2, respectively, as shown in Fig. 2.
3-B-1 and 3-B-2 are configured as a pair.

FIG. 2 is an embodiment showing in detail the relationship between the stator core and the windings according to the present invention. 1 and a lower coil 3-B-1 at the inner bottom of the thrower (thrower) 15-B provided on the other end surface are arranged at vertically corresponding positions, and the coil 3-A-1 and the coil 3
-B-1 and are bound together with a binding thread 16. or,
The upper coils 3-A-2 and 3-B-2 on the slot entrance side are also bound together with a binding thread 17. Also, Hiji Line 18
The connecting portion 19 is housed in the space created between the coil 3-A-2 and the coil 3-B-2, and the connecting portion 19 of the coil 3-A-2, 3-B
-2, the connection part of the Hiji wire does not protrude from the outer periphery of the winding, and the stator has a compact shape.

Effects of the Invention As is clear from the embodiments described above, the axial air gap induction motor of the present invention is particularly advantageous in that the two sets of windings inserted into the stator core are used as upper and lower coil pairs respectively for the first motor and the second motor. By arranging the lower coils inserted into the bottom side of the slot so that they correspond to each other above and below, it is possible to bundle two coils at the same time, and the binding process is faster than the conventional one stator one.
It is almost the same as a coil 10-motor and can be done in a short time. Furthermore, when the upper and lower coils are tied together, each coil is straightened toward the inner bottom side of the slot, which often causes problems such as exposure of the coil to the magnetic pole surface. Furthermore, since the two coils can be bundled at the same time, deformation and movement due to resin injection pressure during stator unit molding are less likely to occur.

The connecting part between the Hide wire and the winding can still be stored in the space between the coils located on the magnetic pole side, so the mold can be processed without that part protruding outward from the stator unit. It is easy to shape and also reduces the amount of resin used.

By sharing two stator cores, which were originally required for two axial gap induction motors, as one, the time for machining the winding core can be significantly shortened, the bundling process after winding insertion can be shortened, and the yoke ( By sharing the yoke (yoke), the number of steel plates and resin materials is reduced and the product is made thinner.

Weight reduction, etc. can be achieved, and costs can be significantly rationalized.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an axial gap induction motor according to an embodiment of the present invention, and FIG. 2 shows a stator of the motor, with A being a plan view and B being a side view. 1... Stator core, 3-A, 3-B...
...Winding, 3-A-1, 3-B-1...Lower coil located at the bottom of the slot, 3-A-2, 3-B-
2... Upper coil located on the magnetic pole surface, -r-A
, 7-B...Rotor core, 1o-A, 10-B
...Rotor.

Claims (1)

[Claims] A first rotor and a second rotor are arranged to face each other on both end surfaces of a stator core formed by spirally winding an iron plate, and the drive winding of each rotor is connected to each rotor of the stator core. An axial air gap induction motor is housed in a first motor slot and a second motor slot formed radially on opposing surfaces of the motor, the driving winding being comprised of both lower and upper coils. , an axial gap induction motor in which the lower coil inserted into the slot inner bottom corresponds vertically to the slot provided on both end surfaces of the stator core.