Motor shaft

A motor shaft and bearing technology, applied in electrical components, electromechanical devices, electric components, etc., can solve the problems of complex motor insulation structure and high cost, and achieve the effects of reducing noise and vibration, stabilizing work, and protecting bearings

Pending Publication Date: 2019-04-26
CHANGZHOU LEKVA ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems of complicated motor insulation structure and high cost in the prior art, this application proposes a motor shaft which solves the above technical problems

Method used

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  • Motor shaft

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Embodiment Construction

[0021] The content of the invention of the present application will be described below in conjunction with the accompanying drawings.

[0022] like figure 1 As shown, a motor shaft includes a shaft body 1, the outer surface of the shaft body 1 corresponding to the bearing installation position is covered with an insulating layer 2, that is, the insulating layer 2 is located between the shaft body 1 and the bearing, and plays an insulating role. effect. The insulating layer 2 is made of insulating material, which can be bulk molding compound (BMC), plastic, rubber or ceramics, preferably bulk molding compound (BMC). The bulk molding compound (BMC) has excellent electrical properties.

[0023] The insulating layer 2 is covered on the shaft body 1 by spraying, injection molding or coating. In the case that the insulating layer 2 can be covered on the shaft body 1 with high precision by spraying, injection molding or coating, the insulating layer 2 can only be processed by spra...

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Abstract

The invention relates to the field of motors, in particular to a motor shaft. The motor shaft comprises a shaft body (1), an insulating layer (2) covers the outer surface of a bearing mounting portionof the shaft body (1), the portion, covered with the insulating layer (2), of the shaft body (1) is provided with counterbores or through holes and fillets, or a surface obtained through milling flatmachining, and the insulating layer (2) partially or completely fills the counterbores or through holes. By means of the motor shaft, the problems in the prior art that a motor insulation structure is complicated and the cost is high are solved.

Description

technical field [0001] The invention relates to the field of motors, in particular to a motor shaft. Background technique [0002] Bearings are very important components in motors and are extremely vulnerable to damage. Bearing damage generally has three types: thermal damage, force damage and electrical damage, among which electrical damage is the main one. According to literature statistics, 25% of bearing damage is caused by the generated shaft current. Due to the existence of the common mode voltage generated in the motor, the shaft voltage will be generated on the motor shaft. When the shaft voltage breaks through the lubricating oil film, a large shaft current will be generated at the moment. The path of the shaft current is transmitted from the motor shaft through the bearing to the motor end cover. After grounding, a loop is formed, and the harm of the shaft current is that electric corrosion will occur on the surface of the rolling elements of the bearing, thereby...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K7/00
CPCH02K7/003
Inventor 唐勇周银霞谌春华
Owner CHANGZHOU LEKVA ELECTRONICS CO LTD
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