Motor Bearing Anti-corrosion Structure and Brushless DC Motor

Abstract

The invention is applicable to the field of motors, and discloses a motor bearing anti-corrosion structure and a brushless DC motor. The motor bearing anti-corrosion structure includes a stator iron core, a conductive locking piece, a conductive nut assembly, a plastic-encapsulated casing and a cover fixed to the plastic-encapsulated casing. The first end cover at one end, the conductive nut assembly and the stator iron core are packaged and fixed in the plastic casing, and one end of the conductive nut assembly is connected with the stator iron core, and the other end is exposed outside the plastic casing. One end of the conductive locking piece is clamped outside the through hole, the other end passes through the through hole, and is screwed to the end of the conductive nut assembly exposed outside the plastic casing. The present invention realizes the conductive connection between the stator iron core and the first end cover through the cooperation of the conductive locking member and the conductive nut assembly, effectively preventing the occurrence of electrical corrosion of the bearing; The long-term reliability of the end cover conduction ensures the long-term effectiveness of the motor's anti-corrosion structure of the bearing.

Description

technical field [0001] The invention belongs to the field of motors, and in particular relates to a motor bearing electric corrosion prevention structure and a brushless DC motor with the motor bearing electric corrosion prevention structure. Background technique [0002] DC motors are generally driven by inverters with inverter modulation (PWM). Since the high-frequency changing current will cause a voltage difference between the inner and outer rings of the bearing, when the voltage difference reaches the voltage that can break down the oil film of the bearing, a small current will pass through the bearing raceway and the bearing ball , As a result, the bearing ball and the bearing channel are damaged and the bearing emits abnormal noise, that is, the electric corrosion phenomenon occurs in the bearing, which seriously affects the service life of the bearing. [0003] In order to solve the above technical problems, the prior art proposes a solution of using metal pins to ...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, and provide a motor bearing anti-corrosion structure and a brushless DC motor, which solve the technical problems of poor reliability and easy failure of the motor bearing anti-corrosion structure

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