摘要
无刷直流直线电机具有推力密度大、控制简单的特点,因而适用于电磁弹射。但是工作频率高、电流大,存在较大推力波动,影响其性能。为了抑制无刷直流电机换相推力波动,对无刷直流电机的换相推力脉动进行了分析,得出了换相期间推力产生波动的原因,指出在PWM控制时,推力波动恒为负。针对上述原因,提出了在换相期间低速时通过滞环比较器控制关断相延迟关断和高速时提前导通的方法减小推力波动,给出了对电源电压的要求和提前导通角的计算方法。仿真验证该方法可将推力波动减小至5%,能够有效改善电磁弹射用无刷直流电机的性能。
Brushless DC linear motor has the advantages of high thrust density and controllability, which is suitable for electromagnetic launcher. But the ripple is obvious because of high frequency and large current. We analyzed the commu- tation force tipples of brushless dc motors. Moreover, using hysteresis comparator and switching on the incoming phase with time advance during the commutation interval, we proposed a method for suppressing the commutation force tipple by switching off the outgoing phase with time delay. Formulations are given for calculating DC voltage and time advance angle. Simulation results show that the tipple is reduced to 5%, proving that the method can improve the performance of brushless DC motor drives for electromagnetic launcher.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2016年第9期2882-2887,共6页
High Voltage Engineering
基金
国家科技支撑计划(2012BAG07B01)~~
关键词
电磁弹射
无刷直流电机
换相推力波动
延迟换相
滞环比较器
提前导通
electromagnetic launch
brushless DC motor
commutation force ripple
switch off delay
hysteresis comparator
switch on advance
