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摘要
In order to solve the problems such as complex mechanism of speed harmonics caused by cogging torque of permanent magnet synchronous motor under vector control and the complexity of control system increased by current cogging torque suppression method, an mathematical model of speed harmonic caused by cogging torque under vector control was derived and a speed harmonic minimization method based on PI controller parameter tuning was proposed. By analyzing the closed-loop transmission mechanism from cogging torque to motor speed under vector control, the closed-loop transfer function from cogging torque to motor speed was deduced,then the mathematical model between cogging torque and speed was established. Secondly, based on the derived mathematical model established the objective function, then the genetic algorithm was used to search the PI parameters that minimize the amplitude of speed harmonic caused by cogging torque. Finally, accuracy of the derived mathematical model and effectiveness of the proposed speed harmonic minimization method were verified by simulations and experiments. The results show that the PI parameters with minimum speed fluctuation optimized based on the derived mathematical model can reduce the speed harmonic amplitude caused by cogging torque by more than 20%. ? 2023 Editorial Department of Electric Machines and Control.
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