Motor active noise reduction method and system

Abstract

The present invention discloses a motor active noise reduction method and system. The method comprises: building the corresponding relation of harmonic waves and motor noise according to the power supply parameters of a converter, the motor parameters of the motor supplied by a converter and the motor noise generated in the parameter conditions; obtaining the current power supply parameters and the current motor parameters when the converter supplies power to the motor; determining the noise generated by the motor at present according to the current power supply parameters, the current motor parameters and the corresponding relation; and generating sound having the same amplitude and frequency as the noise generated by the motor at present and opposite phases from the noise generated by the motor at present to eliminate the noise generated by the motor at present. In the process of the motor control, after determining the noise generated by the motor at present, the motor active noise reduction method and system generate sound having the same amplitude and frequency as the noise generated by the motor at present and opposite phases from the noise generated by the motor at present to perform orienteering and accurate elimination of the noise generated by the motor at present and actively reduce the influence of the converter harmonic waves on the motor noise so that the active noise reduction is reduced and the noise reduction effect is good.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a method and system for active noise reduction of motors. Background technique [0002] As a device that converts electrical energy into mechanical energy, the motor is used in various fields of life. At present, the converter is usually used to control the speed of the motor, which has the advantages of energy saving, high-speed continuous speed control in a wide range, and adaptability to various complex working environments. However, when the converter supplies power to the motor, a lot of harmonics will be generated. The harmonics will generate electromagnetic force at the iron core of the motor, causing the motor to vibrate and generate noise, which affects the living and working environment of people. In order to reduce motor noise, noise control is mainly carried out from the perspective of the motor in the prior art. Although the mechanical noise of the motor can be reduc...

AI Technical Summary

Problems solved by technology

However, when the converter supplies power to the motor, there will be a lot of harmonics. The harmonics will generate electromagnetic force at the iron core of the motor, causing the motor to vibrate and generate noise, which affects the living and working environment of people.

In order to reduce motor noise, noise control is mainly carried out from the perspective of the motor in the prior art. Although the mechanical noise of the motor can be reduced to a certain extent, it cannot achieve precise and directional reduction of the electromagnetic noise generated by the harmonics of the converter.

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