Motor and electrical equipment with same

Abstract

The invention belongs to the technical field of motors, and relates to a motor and electrical equipment with the motor. A traditional integrated bearing bracket is separated into a stator bracket partand a bearing supporting part, a bracket insulating layer is arranged between the stator bracket part and the bearing supporting part, and equivalently, an insulating layer capacitor is added betweenthe stator bracket part and the bearing supporting part. Due to the arrangement of the bracket insulating layer, the equivalent capacitance of the stator side can be greatly reduced. In the loop of the high-frequency circuit, the shaft voltage is the voltage division of the two ends of the bearing capacitor, and the equivalent capacitor of the stator side is equivalently connected to the bearingouter ring side of the bearing capacitor in series. Therefore, the equivalent capacitance of the stator side is reduced through the arrangement of the bracket insulating layer, so that the two ends ofthe bearing capacitor obtain smaller voltage division, i.e., the shaft voltage is reduced. An electrode structure is arranged to reduce shaft voltage and shaft current. The risk of bearing electrocorrosion is reduced. For a motor which is large in power and adopts a large metal shell to improve the installation strength and guarantee heat dissipation, the risk of electrocorrosion damage to a motor bearing can be reduced.

Description

technical field [0001] The invention belongs to the technical field of electric motors, and in particular relates to an improved electric motor for preventing electric corrosion of bearings and electric equipment with the same. Background technique [0002] In recent years, due to the energy-saving trend of electrical equipment, the motors used are usually replaced by high-efficiency brushless DC motors for induction motors, such as air-conditioning units, which use high-efficiency brushless DC motors to drive fans. And these brushless DC motors are driven with an inverter, which employs a pulse width modulation method (hereinafter referred to as PWM) as a driving method. In this PWM driving method, the neutral point potential of the winding is not zero and a common-mode voltage occurs. In the case of high frequency, coupling capacitance is generated between the motor structure, and the common-mode voltage passes through the stator, rotor, permanent magnet, The coupling cap...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the embodiments of the present invention is to provide a motor to solve the technical problem of electric corrosion of high-power motor bearings

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