无刷直流电机恒功率调速技术的研究

在对无刷直流电机进行恒功率调速时,采用常规的超前角调制存在调速范围小,相电流大的缺点.介绍了一种新颖的功率变换器,即在传统的三相桥电路后串人品闸管整流器.由于晶闸管电流的单向流动性,从而避免了电机恒功率调速时的馈能现象,并且在保证相电流有效值不增大的同时大大扩展了电机的调速范围.实验结果表明,采用该电路,可以保证相电流...

Study for Constant Power Speed Range of the Brushless DC Motor

Conventional phase advance method has some disadvantages of low speed ratio and high phase current used in brushless DC motor over the constant power speed range(CPSR).A novel circuit topology was introduced,and a thyristor circuit is added into conventional three-phase bridge circuit.The regeneration mode of motor can be canceled because the current of thyristor only can flow by one direction,and it ensures that the motor has a wide CPSR without adding phase current.Experimental results verify the proposed strategy can achieve a more CPSR,and it can be applied in electric vehicle.