JPH0213544B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small-sized induction motor, and its purpose is to simplify the winding work by winding a coil around a bobbin in advance, thereby providing a small-sized induction motor with low assembly costs. It's about doing.

In conventional small-sized induction motors, a pre-wound coil is inserted into a coil groove provided in a stator core to manufacture a small-sized induction motor.

However, with this manufacturing method, in the case of small-sized induction motors with low output or high voltage, the wire diameter of the coil becomes thinner, so there is a risk of wire breakage when inserting the coil.
In addition, groove insulating paper and wedges are required for the number of coil grooves, interlayer insulating paper is required to ensure insulation between the main coil and auxiliary coil, and furthermore, in order to make the coil end the specified size and shape. This required shaping work and binding work at the coil ends to prevent the coils from becoming disordered.

The present invention simplifies these complicated assembly operations and provides a small-sized induction motor with a small number of assembled parts, and will be described below with reference to the drawings. FIG. 1 is a plan view of the inside of a small induction motor according to the present invention, and FIG. 2 is a sectional view at AOA of FIG. 1. In Figures 1 and 2, 1 is a yoke consisting of stacked ring-shaped yoke plates having notches 2 at 90° intervals on the inner periphery, and 3 and 3 are strip-shaped iron core plates with a rotor hole 4 in the center. 5 is a bobbin made of electrically insulating material around which a coil 6 is wound.
Note that 7 is a rotor and 8 is a lead wire.

The assembly of the small-sized induction motor according to the present invention having the above configuration is performed as follows. First, a pair of iron cores 3, 3 formed by stacking a plurality of iron core plates are fitted with bobbins 5 on which coils 6 are wound in advance from both ends, and a plurality of other yoke plates are stacked to form the yoke 1. I'll make it. In order to attach the pair of iron cores 3, 3 into which the bobbin 5 is fitted to the yoke 1, both ends of the iron cores 3, 3 are inserted into the notches 2 provided at 90° intervals on the inner circumference of the ring-shaped yoke 1. A pair of iron cores 3 and 3 are attached to the yoke 1 in a cross shape by press-fitting.
It is assumed that the thickness of the yoke 1 and the sum of the thicknesses of the pair of iron cores 3 and 3 are equal. Next, the rotor 7 is attached inside the rotor hole 4 of the iron cores 3,3.

In the small induction motor according to the present invention assembled in this manner, both ends of one iron core serve as main magnetic poles, and both ends of the other iron core serve as complementary magnetic poles.

As described above, the small induction motor according to the present invention has a pair of cores in which a plurality of core plates are stacked, bobbins with coils wound in advance are fitted onto both ends of the core, and cutouts are formed at 90° intervals on the inner circumference. By press-fitting both ends of the core into the notches of a yoke made by stacking multiple yoke plates, the core and yoke are integrated in a cross shape, with both ends of one core serving as the main magnetic pole and both ends of the other core. is used as a complementary pole, and all the drawbacks of the conventional small-sized induction motor of this type as mentioned above are eliminated, and assembly is simple and assembly cost is low.

It goes without saying that a powder insulating material may be used instead of the electrically insulating material.

[Brief explanation of drawings]

FIG. 1 is a plan view of the inside of an induction motor according to the present invention, and FIG. 2 is a sectional view taken along A--A in FIG. 1. 1...Yoke, 2...Notch, 3...Iron core, 5...
...Bobbin, 6...Coil.

Claims (1)

[Claims] 1. A first core made of a plurality of laminated rectangular iron core plates each having a rotor insertion hole in the center, and a second iron core laminated with a plurality of rectangular iron core plates each having an insertion hole in the center having approximately the same diameter as the insertion hole. An iron core, a first winding wound around both terminals of the first iron core, a second winding, a third winding wound around both terminals of the second iron core, a fourth winding, a first iron core, and A ring-shaped yoke core has an inner diameter into which the second core is press-fitted at an angle of about 90 degrees with the insertion hole as the center, and one of the first core and the second core is used as the main magnetic pole. , a small induction motor characterized by using the other iron core as an auxiliary magnetic pole.