Current synchronous control method for doubly salient brushless DC motor

Abstract

The invention discloses a current synchronous control method for a doubly salient brushless DC motor, and relates to the field of reluctance motor control. The invention comprises the following steps:an electrical angle corresponding to the current zero-crossing point is detected as the observation value of the current phase, the angle of the zero-crossing point is used as a controlled variable,and the advance commutation angle is used as the controlled variable, the feedback closed-loop control is performed, thereby realizing the automatic adjustment of the advance commutation angle and theautomatic control of the current phase, so that the current phase and the counter EMF phase keep synchronous under different excitation currents, rotational speeds and loads. The invention avoids theproblems of output torque reduction and torque ripple increase caused by current phase lag, improves the torque output performance of the motor at high rotation speed, and has important application value in multi-electric aircraft, new energy vehicle and other systems.

Description

technical field [0001] The invention relates to the field of reluctance motor control, in particular to a current synchronous control method of a double salient pole brushless DC motor. Background technique [0002] Doubly salient pole brushless DC motor (hereinafter referred to as doubly salient pole motor) has attracted extensive research interest in the fields of aviation starter power generation and electric vehicles due to its simple and reliable structure and low cost. According to different excitation methods, doubly salient pole motors can be divided into three types: permanent magnet excitation doubly salient pole motors, electric excitation doubly salient pole motors and hybrid excitation doubly salient pole motors. [0003] Since the back EMF is a unique non-sinusoidal waveform, the current of the doubly salient motor needs to be controlled as a step-shaped quasi-square wave in order to obtain good torque performance. A step change in the ladder-shaped current re...

AI Technical Summary

Problems solved by technology

[0010] The invention provides a current synchronous control method for a double-salient brushless DC motor, which can automatically synchronize the current phase and the counter electromotive force phase under the influence of the excitation current, rotational speed and load changes, solve the problem of current phase lag, and improve the motor at high speed. Torque output performance at speed

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