直流母线电压可变的混合式步进电机控制策略

摘要

开环控制混合式步进电机在中高速区的负载能力与直流母线电压有关,提高直流母线电压可以提高电机的负载能力.但直接提高直流母线电压会增大混合式步进电机及功率管的损耗,降低驱动系统效率.介绍了一种根据电机负载情况控制直流母线电压的步进电机控制策略.实验结果表明,该控制策略能在保持混合式步进电机最大负载能力的基础上,降低电机损耗,达到负载能力与损耗兼顾的目的.%The load capacity of hybrid stepping motor with open loop control in middle-speed and high-speed field is associated with the DC link voltage.Increasing the DC link voltage can improve the load capacity of motor.However,increasing the DC link voltage directly will increase the loss of hybrid stepping motor and devices and reduce the efficiency of the driving system.A control strategy of stepping motor was proposed to control the DC link voltage by the load of the motor.The experimental results show that the control strategy can reduce the loss of the hybrid stepping motor on the maximum load capacity so as to gain load capacity and efficiency of the motor to some extent.