一种考虑感应电机动态效率的转矩控制策略

在许多应用感应电机的场合如电动车或电动船,要求其不但转矩响应好、还要动、稳态效率高.在分析当前稳态以及动态条件下感应电机效率优化控制策略的基础上,本文提出一种考虑感应电机动、稳态效率的转矩控制策略.该策略依据最优滑差频率的控制思想,结合转子磁链定向的矢量控制和磁链解耦控制,以实现兼顾效率的高性能转矩控制.仿真和实验结果表明该方法既能够提高电机在动、稳态运行时的效率,又能够保持较好的转矩动态性能.

A Torque Control Strategy of Induction Motors Taking Efficiency of Dynamic State into Account

Many applications of induction motors,such as the electric cars and electric ships,need a torque control strategy taking efficiency of both static and dynamic state into account because the efficiency of energy is strictly required for such applications. After analyzing the present efficiency-optimization control strategies for induction motors in steady and dynamic state,this paper presents a novel torque control strategy for the optimization of efficiency in steady and dynamic state. Based on the idea of optimal slip frequency control the strategy combines the idea of rotor flux oriented vector control and decoupled control for rapid torque response with optimal slip frequency control for minimum loss. As the result,the method can not only improve the efficiency of induction motor both in steady and transient states,but also provide good torque response performance. Simulation and experiment results confirm its validity.