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Electric motors, blowers and compressors

A technology of electric motors and cold pressing, which is applied in the field of blowers, compressors, and electric motors. It can solve problems such as electric corrosion and achieve high reliability.

Active Publication Date: 2019-05-07
MITSUBISHI ELECTRIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When aluminum wire is used as part of the winding of the electric motor (motor), it is necessary to join the copper wire and the aluminum wire, but there is a possibility of galvanic corrosion (galvanic corrosion)

Method used

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  • Electric motors, blowers and compressors
  • Electric motors, blowers and compressors
  • Electric motors, blowers and compressors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0032] figure 1 It is a side view showing the embodiment of the stator included in the electric motor (motor) according to the present invention. A stator 1 (stator) of a motor has a stator core 2 and a plurality of windings (coils) inserted into slots (not shown) of the stator core 2 . Electromagnetic steel sheets are laminated on the stator core 2 .

[0033] Here, a single-wire aluminum wire insulated by a coating is used for at least one of the plurality of windings (one phase or one type of wiring). This means that in a motor with three-phase windings, the winding of at least any one of U-phase, V-phase, and W-phase is aluminum wire; in a motor with single-phase winding, the main winding or auxiliary winding is aluminum wire. In a multi-winding motor in which windings are formed in one slot by connecting two or more windings in parallel, at least one wire is an aluminum wire.

[0034] exist figure 1 Since the winding is wound between the slots, coil end portions 3 a an...

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Abstract

The present invention provides a motor capable of maintaining high reliability even when a lightweight aluminum wire is used for the winding of the coil. The motor of the present invention has: a rotor; and a stator (1) with a plurality of windings wound in slots, wherein at least one of the plurality of windings has: a single-wire aluminum wire (7); a single-wire copper wire (6) ), which is joined with the aluminum wire (7); stranded wire (conductor 5), which is joined with the copper wire (6); ) formed by cold pressure welding; and a non-pressure welded joint (joint 56 ), which is formed between the copper wire ( 6 ) and the stranded wire (conductor 5 ), in the cold pressure welded part (joint 56 ) The portion 67 ) has a burr ( 67A) covered by an insulating member (insulating tube 9 ), and the thickness of the insulating member (insulating tube 9 ) is greater than the height of the burr ( 67A).

Description

technical field [0001] The invention relates to electric motors, blowers and compressors. Background technique [0002] Conventionally, techniques for reducing the weight of the electric motor (motor) by using aluminum wire for a part of the winding of the electric motor (motor) have been considered. When an aluminum wire is used for a part of the winding of an electric motor (motor), it is necessary to join the copper wire and the aluminum wire, but there is a possibility of galvanic corrosion (galvanic corrosion). In order to prevent this situation, as a method of joining copper wires and aluminum wires, a method (cold press welding method (hereinafter referred to as cold press welding) of contacting the end faces of both conductors and joining them at room temperature has been proposed. )). Cold press welding is a wiring method utilizing metal bonds on both fresh surfaces (unoxidized metal surfaces) exposed by mutual pressing of wire rods, and is a highly reliable joini...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K3/02
CPCH02K3/02H02K3/50H02K2203/06H02K2213/03H02K3/345H02K5/225H02K3/32H02K15/0068H02K15/10
Inventor 矢部浩二马场和彦堤贵弘及川智明
Owner MITSUBISHI ELECTRIC CORP