Motor driver, driving control method and device thereof and electronic equipment

Abstract

The invention provides a driving control method for a motor driver. The method comprises the steps of obtaining an instruction voltage corresponding to a current switching period; determining three basic voltage vectors corresponding to the instruction voltage according to the instruction voltage, wherein the three basic voltage vectors are vectors corresponding to three output states in seven output states corresponding to common-mode voltages -Udc / 2, -Udc / 6 and Udc / 6, and Udc is direct-current bus voltage; determining a weight value corresponding to each basic voltage vector according to the instruction voltage and the three basic voltage vectors; and determining a three-phase control signal according to the three basic voltage vectors and the respective corresponding weight values. According to the invention, the algorithm of the three-phase control signal can be optimized to determine the appropriate three-phase control signal in the inversion process, so that the content of common-mode voltage in the output three-phase voltage is reduced as much as possible, the generation of shaft voltage and shaft current is inhibited, and the service life of the motor is prolonged.

Description

technical field [0001] The present invention relates to the technical field of power electronics, in particular to a motor driver, its drive control method, device and electronic equipment. Background technique [0002] Since the variable frequency drive realizes the output of the specified voltage through the equivalent principle, the three-phase output voltage of the drive contains high-frequency common-mode voltage. The high-frequency common-mode voltage acts on the AC motor, which will form a shaft voltage on the motor shaft and bearings through the distributed capacitance between the various parts of the motor. When the shaft voltage exceeds a certain threshold, it will break down the lubricating oil film between the bearings. Long-term exposure to high-frequency shaft voltage will accelerate the aging of the bearings of the motor. As a result, the noise of the motor increases, the mechanical resistance increases, and the energy efficiency decreases and a series of ne...

AI Technical Summary

Problems solved by technology

[0005] According to the drive control method of the motor driver in the related art, not only the cost of the motor is greatly increased, but also the investment in later maintenance is increased

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