小电感无刷直流电机不同驱动结构下的控制特性及功耗比较

摘要

针对具有小电感特性的无刷直流电机,比较了全桥结构下PWM驱动和PAM驱动方式的区别。两种驱动方式下系统的控制特性和功耗有所不同,对于全桥结构下的PWM驱动方式,具有调速特性非线性的特点,在控制系统设计时应考虑在不同转速下采用不同的比例系数;而PAM驱动方式具有调制特性线性度好、电流平滑、涡流损耗小、系统功耗低和高低速系统特性一致的特点,但相对地增加了结构复杂性。两种驱动结构应根据实际情况使用。%For BLDC motor with small inductance,the control characteristics and mechanical properties was compared under the PWM drive mode and pulse amplitude modulation（PAM） drive mode.PWM mode has nonlinear control characteristics,and different proportion coefficient should be used in different speed range.PAM drive mode has good linearity,all speed range consistent and the lower power consumption features.But the system structure complexity is increased relatively.The comparison indicates that under PWM and PAM drive mode the system has different performance,and lower power consumption.The actual situation should be considered,when using the two dive mode.