Hao Shuanghui

A harmonic injection SPWM method for the high-responsive PMSM control system

In a permanent magnet synchronous motor (PMSM) control system, usually, the phase voltage instruction is limited independently to prevent a three-phase pulse width modulation (PWM) wave from overflowing. This method decreases the efficiency of the bus voltage and causes voltage vector direction errors. To solve these problems, we propose a harmonic injection sinusoidal pulse-width modulation (SPWM). This method uses harmonic injected sinusoidal PWM to improve the utilisation ratio of the bus voltage, and consequently improve system performance. In this paper, we analyse the problem in terms of potential difference. The simulation results show that the proposed method can increase the utilisation ratio of the bus voltage up to 15.4%, and the voltage vector mode obtained with the proposed algorithm is larger than that obtained with the conventional one. The method with harmonic injection consequently improves current response, without affecting voltage vector accuracy. The experiment results validate the proposed method.

Theory Research on NC Instruction Interpretation for Trajectory Trace

Based on the global optimization design method of Mechatronics, from the perspective of the performance optimization of the overall CNC equipment, the dynamic model of the controlled mechanism is built, and then which is used to research on the error-free trajectory tracking for the controlled mechanism. Based on the model of the error-free trajectory tracking, NC instruction interpretation with high-order differentiability is proposed, and then relevant in-depth research is performed. NC instruction interpretation with high-order differentiability is pointed out. Finally, it is achieved on the multi-axis system with the same cycle control has been successfully developed by the author. The result demonstrates that NC instruction interpretation with high-order differentiability is useful to improve the error of trajectory tracking.