【摘要】 针对三相PWM驱动电机系统难以建立用于预测干扰的准确的高频干扰源数学模型这一问题,提出将整流桥和逆变器两个干扰源分开进行研究的方法。采用傅里叶变换法建立整流桥的干扰源模型,采用双重傅里叶积分法建立逆变桥产生的共模和差模干扰的干扰源数学模型,把PWM载波和基波用两个独立周期的时变函数来描述,将其共同作用的函数作为被积函数,并详细推导了正弦脉宽调制技术的内外积分线的确定过程。最后通过实验结果和仿真结果的比较,验证了所建立整流桥和逆变器的干扰源模型的正确性,因此该数学模型可作为三相PWM驱动电机系统的传导干扰预测的干扰激励源。更多还原

【Abstract】 Mathematical models of rectifier and inverter was separately studied since three phase pulse width modulation(PWM) drive motor system had no exact high frequency noise source model for forecasting interference.Based on Fourier Transform and Double Fourier integral,Mathematical models on common mode and differential mode noise source of rectifier and inverter were separately built,which laid a foundation for interference forecast of system.PWM carrier wave and fundamental wave function were described by two independent periodic time function and the action function and let the combined function become integrand of Double Fourier integral.The inner and outer integral limits with sine pulse width modulation were obtained.The simulation and experiment results demonstrate that mathematical model of noise source is valid.So the mathematical models can be used as the excitation source of conducted interference forecast of PWM drive motor system.更多还原