基于直接磁链矢量的感应电机转矩效率最优控制

Direct Flux Vector Control-based Maximum Efficiency Per Torque for Induction Motor Drive

传统的感应电机驱动控制策略在电机轻载运行时的效率较低。针对该问题,提出了一种基于直接磁链矢量的感应电机转矩效率最优控制方案。新型控制策略的基本原理是根据给定的转矩需求和转速,通过查询表来计算最优定子磁链,从而直接调节实际定子磁链来获取电机最大效率。而最优定子磁链查询表是基于电机空载和堵转试验结果,并进行离线计算得到的。同时还设计了一个基于定子磁链和电机频率的铁损模型,用于校准和在线检测电机的损耗。通过2.2 k W的感应电机试验平台开展了不同工况下的试验研究,试验结果验证了新型控制下电机的效率提升效果。

The traditional induction motor drive control strategy has the low efficiency if the motor operating at light load. To solve this problem, a direct flux vector control-based maximum efficiency per torque was presented for induction motor drive. The basic principle of the new control strategy calculated the optimal stator flux linkage according to lookup ta- bles with the given torque requirement and speed, and the maximum efficiency of the motor could be achieved by directly adjusting the actual stator flux linkage. The optimal stator flux linkage lookup tables could be taken by off-line calculating based on the results of no-load and locked rotor test. An iron loss model based on stator flux and frequency had been de- signed at the same time, which was used for calibration and online detection of motor loss. Through the 2.2 kW induction motor test platform to carry out the experiments under the different conditions, and the results verify the performances of the new controller for motor efficiency up.