Torque fluctuation suppression method and control system for brushless DC motor

Abstract

The invention discloses a torque ripple suppression method of a brushless DC motor. The torque ripple suppression method comprises the steps of: judging operating processes of the brushless DC motor; adopting a corresponding modulating method for controlling the brushless DC motor according to each operating process of the brushless DC motor, and establishing a voltage equation mathematical model of a conduction winding according to the corresponding modulating method; and acquiring a PI controller according to an internal model control principle, and performing closed-loop control on current of the brushless DC motor through the single PI controller for suppressing torque ripples according to the established voltage equation mathematical models. The torque ripple suppression method adopts the single PI controller to achieve closed-loop control on non-commutation operating process, low-speed commutation operating process and high-speed commutation operating process of the brushless DC motor, effectively suppresses torque ripples of the brushless DC motor, simplifies design and debugging processes of the PI controller, and reduces cost. The invention further discloses a control system of the brushless DC motor.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a torque fluctuation suppression method of a brushless DC motor and a control system of the brushless DC motor. Background technique [0002] Trapezoidal wave brushless DC motor has the advantages of high power density, high efficiency and simple control, and has been widely used in aerospace, robotics, automotive electronics, household appliances and other fields. Among them, the size of the torque fluctuation is an important index to measure the control performance of the motor system, and the torque fluctuation caused by the commutation process of the brushless DC motor can reach 50% of the average torque at most, which will cause the speed fluctuation of the motor system, the occurrence of Vibration and noise will deteriorate the control performance of the motor. [0003] In order to suppress the torque fluctuation that occurs during the commutation process of the brus...

AI Technical Summary

Problems solved by technology

Among them, the size of the torque fluctuation is an important index to measure the control performance of the motor system, and the torque fluctuation caused by the commutation process of the brushless DC motor can reach 50% of the average torque at most, which will cause the speed fluctuation of the motor system, the occurrence of Vibration and noise, deteriorating the control performance of the motor

[0003] In order to suppress the torque fluctuation that occurs during the commutation process of the brushless DC motor, open-loop control is used for the control of the commutation process in the prior art, but the control accuracy is poor and the suppression effect is not obvious

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