关键词: 双三相永磁同步电机, 直接转矩控制, 扩张状态观测器, 转矩脉动

Abstract: A speed-current third harmonic active suppression-based direct torque control strategy is proposed for the
dual-three-phase permanent magnet synchronous machine. The operational principle of the motor was analyzed, where by fundamental and fifth harmonic components were regulated through precise torque angle control. For the third harmonic component,which only contributes to losses,an adaptive notch filter based on the least mean square algorithm was designed to extract the third harmonic current. This extracted harmonic was incorporated as known disturbance information into an extended state observer that integrates rotate speed and third harmonic dynamics, forming an active speed-current third harmonic suppression controller. The effectiveness of the proposed method is verified through a series of simulation results.

Key words: dual three-phase permanent magnet synchronous motor, direct torque control, extended state observer, torque ripple