永磁同步电动机直接转矩控制的效率优化

针对永磁同步电动机在轻载、高速运行时效率和功率因数下降的问题,提出了一种永磁同步电动机直接转矩控制效率优化策略。该策略通过分析电动机损耗与转矩、转速和定子磁链之间的关系,建立了考虑铁损的永磁同步电动机数学模型,导出了效率最优时的定子磁链幅值;将最优定子磁链计算模块嵌入直接转矩控制系统,构成了效率最优的永磁同步电动机直接转矩控制调速系统。仿真结果表明,该优化策略能有效降低永磁同步电动机功率损耗,提高电动机的运行效率。

Efficiency optimization of direct torque control for permanent magnet synchronous motor

For problem of efficiency and power factor falling of permanent magnet synchronous motor running in light load and high speed,an efficiency optimization strategy of direct torque control for permanent magnet synchronous motor was proposed.The mathematical model was established based on considering iron loss of permanent magnet synchronous motor and analyzing relationships among power loss and torque,speed and stator flux linkage,and the optimal stator flux amplitude was derived.The optimal stator flux calculation module was embedded into direct torque control system,and speed-regulation control system of optimal efficiency of direct torque control for permanent magnet synchronous motor was constituted.The simulation results show that the strategy can effectively reduce the power loss of permanent magnet synchronous motor and improve operation efficiency of the motor.