Method for suppressing brushless direct current motor phase change torque fluctuation based on Bang-bang control

Abstract

The invention provides a method for suppressing brushless direct current motor phase change torque fluctuation based on Bang-bang control. The method includes the following steps that (1), a work area of a motor is judged; (2), if the motor is located in a phase change work area, a torque fluctuation index is calculated and compared with an upper limiting value and a lower limiting value, and the step(3) is executed, and if the motor is located in a non-phase-change work area, the step (1) is executed again; the torque fluctuation index is a parameter reflecting the intensity of the torque fluctuation, and the upper limiting value and the lower limiting value are set values; (3), according to the comparison result between the torque fluctuation index, and the upper and lower limiting values, a turn-off phase of the motor is controlled to be turned off and communicated. The defects that according to an existing solution of suppressing the brushless direct current motor torque fluctuation, the optimal phase change moment is difficult to determine, implementation can not be performed within a full-speed range of the motor, and a control strategy is complex are overcome. The method can be effective and practical within the full-speed running range of the motor, the problem of phase change torque pulses of the motor is effectively solved, and running reliability of the motor is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of brushless DC motor control, and relates to a motor control method, in particular to a method for suppressing motor commutation torque fluctuations. Background technique [0002] Brushless DC motor refers to a permanent magnet brushless motor driven by a square wave. The permanent magnet brushless motor adopts electronic commutation, which avoids the mechanical contact device composed of commutator and brush used in traditional motors, and the maintenance cost is simple and the service life is long. Brushless DC motors have become an important development direction of new motors due to their high efficiency, large starting torque, strong overload capacity, good high-speed operation performance, simple and firm structure, small size, and light weight. They are used in electronic drives and industrial production. , office automation and other fields have been widely used. Therefore, the brushless DC motor ...

AI Technical Summary

Problems solved by technology

[0004] Most of the current commutation torque fluctuation suppression strategies adopt the method of turning on the turn-off phase in advance and delaying the turn-off of the turn-off phase when commutating. Increasing the complexity of the control strategy is not conducive to the rapid response of the system. Therefore, it is necessary to find a commutation torque fluctuation suppression strategy that is effective and practical in the full speed range of the motor to improve operational reliability.

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