Simulation and analysis of harmonic suppression strategy in elevator door-machine servo system

REN Yu， MO Xue-juan
（College of Computer， Hangzhou Dianzi University， Hangzhou 310018， China）

Abstract： The harmonics will make the elevator-door motor generate additional vibration，reduce its use-time，affect the normal operation of system. In order to solve the existence of harmonic problems in the elevator door-machine servo-control system，a harmonic suppression strategy based on the variable frequency carrier wave of sinusoidal pulse width modulation（SPWM） was proposed. The mathematical model of the permanent magnet synchronous motor（PMSM） in the three-phase static coordinate system was introduced and the reasons of the harmonic in the elevator-door motor were analyzed. Experiments were carried out based on the Matlab platform. The experimental results show that the proposed method makes the motor stator current waveform tend to be smooth，and the motor's stability could also be enhanced．
Key words： elevator door-machine；permanent magnet synchronous motor（PMSM）；harmonic suppression；sinusoidal pulse width modulation（SPWM）