JPH11206076A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To significantly reduce the manufacturing cost for a stator and enhance the efficiency of a motor, by immersing a cylindrical core in molten insulating agent to form a film composed of the insulating agent on the surface of the cylindrical core. SOLUTION: A core 3 is immersed in a molten insulating agent 21, such as polyimide, epoxy, stored in a bath 2, and a film composed of the insulating agent 21 is thereby formed on the surface of the core 3. Since an insulating film is thus formed on the inner surfaces of slots 4, an insulating film for providing insulation between windings and a core is obviated, and cost therefor, trouble and time required for placing such an insulating film can be saved. Therefore, the manufacturing cost for a stator can be significantly reduced. In addition, the number of windings in the slots 4, that is, space factor, is increased, and thus the efficiency of the motor is enhanced. When the motor is housed in the sealed housing of a hermetically sealed compressor, current leaking from the circumference of the core 3 to the sealed housing can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an electric motor suitable for being incorporated in a hermetic compressor.

[0002]

2. Description of the Related Art An example of a conventional electric motor is shown in FIG. 2, in which (A) is a longitudinal sectional view taken along line AA of (B), and (B) is (A).
FIG. 3 is a cross-sectional view taken along line BB of FIG.

[0003] The electric motor 100 comprises a stator 1 and a rotor 2. The stator 1 is configured by winding a large number of windings 5 around a cylindrical core 3 formed by laminating a large number of thin electromagnetic steel sheets through a plurality of slots 4 provided at predetermined intervals in a circumferential direction thereof.

The rotor 2 has an iron core 6 formed by laminating a large number of thin electromagnetic steel sheets, and a plurality of (four in the figure) permanent magnets are provided on the outer periphery of the iron core 6 at predetermined intervals in the circumferential direction. Magnet 7a,
7b, 7c and 7d are provided. A hub 9 made of a non-magnetic material is embedded in the center of the iron core 6, and a rotating shaft 8 is fixed through the center.

[0005]

In the above-mentioned conventional electric motor, as shown in FIG. 3, after an insulating film 11 is provided on the inner surface of the slot 4, the winding 5 is wound around the core 3, and then the winding is wound. Since the insulation between the winding 5 and the core 3 is insulated by inserting the insulating film 12 at the entrance side of the wire 5, there is a problem that the production of the stator 1 is troublesome and time-consuming, and the cost is increased.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and its gist is that a plurality of thin electromagnetic steel sheets are laminated on a cylindrical core. An electric motor comprising a stator formed by winding a number of windings through slots, wherein a coating made of the insulating agent is formed on the surface of the cylindrical core by immersing the core in a molten insulating agent. Electric motor.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIG. The core 3 is immersed in an insulating agent 21 such as polyimide, senyol, epoxy or the like stored in a bath 20 in a molten state to form a coating made of the insulating agent 21 on the surface of the core 3. Other structures are the same as the conventional one shown in FIG.

However, since an insulating film is formed on the inner surface of the slot 4, insulating films 11 and 12 for insulating the winding 5 and the core 3 from the conventional one are not required. Since the number of steps and time required for the interposition can be omitted, the manufacturing cost of the stator 1 can be greatly reduced.

Further, the number of windings 5 in the slot 4, that is,
Since the space factor is improved, the efficiency of the electric motor is improved.
When this electric motor is incorporated in a sealed housing of a hermetic compressor, it is possible to reduce a current leaking from the outer peripheral surface of the core 3 to the hermetically sealed housing that is in close contact with the core.

[0010]

According to the present invention, a coating made of an insulating agent is formed on the surface of a cylindrical core by immersing the core in a molten insulating agent. The above-mentioned insulating film becomes unnecessary, and this cost and the number and time required for interposing the insulating film can be omitted, so that the manufacturing cost of the stator can be greatly reduced.

Further, since the number of windings in the slot, that is, the space factor is improved, the efficiency of the electric motor can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a procedure for manufacturing a stator according to the present invention. FIG.

FIG. 2 shows a conventional electric motor, wherein (A) is AA of (B).
FIG. 4B is a longitudinal sectional view along the line, and FIG. 4B is a transverse sectional view along the line BB in FIG.

FIG. 3 is an enlarged sectional view of a slot of a conventional electric motor.

[Explanation of symbols]

 3 cores 4 slots 20 tanks 21 insulation

Claims (1)

[Claims] 1. An electric motor comprising a stator formed by winding a large number of windings through a plurality of slots on a cylindrical core formed by laminating a large number of thin electromagnetic steel sheets, wherein the cylindrical core is a molten insulating material. An electric motor characterized in that a film made of the insulating agent is formed on a surface of the electric motor by immersion in the motor.