基于模糊随机PWM技术的永磁直线电机性能分析

Performance analysis of permanent magnet linear motor based on fuzzy random PWM technology

针对恒定开关频率的变频器产生的窄带高频谐波问题,提出了一种基于模糊随机脉冲位置调制(FRPPM)的方法来降低输出电压频谱中的集中谐波簇,FRPPM方法是在较宽的频率范围内扩展原始的窄带谐波使电压频谱均匀地分散在频带上,从而降低了电机气隙磁场产生的电机震动噪声。通过MATLAB/SIMULINK对永磁直线电机控制系统进行建模仿真,并与传统切换模式进行对比分析。结果表明:变频器输出电压的集中高频谐波在开关频率处将有效降低,且使电压频谱分布更加均匀,进而改善了电机气隙磁场的波形。

Aiming at the narrow-band high-frequency harmonic problem generated by the inverter with constant switching frequency,a method based on fuzzy random pulse position modulation(FRPPM)is proposed to reduce the concentrated harmonic cluster in the output voltage spectrum,FRPPM is to spread the original narrow-band harmonics over a wide frequency range to evenly distribute the voltage spectrum in the frequency band,thereby reducing the motor vibration noise generated by the motor air gap magnetic field.The permanent magnet linear motor control system is modeled and simulated by MATLAB/SIMULINK,and compared with the traditional switching mode and analyzed.The results show that the concentrated high-frequency harmonics of the output voltage of the inverter will be effectively reduced at the switching frequency,and the voltage spectrum distribution will be more uniform,thus improving the waveform of the air gap magnetic field of the motor.