基于主动磁链修正的异步电机六拍转矩控制方法

Six Steps Torque Control Method for Induction Motor Based on Active Flux Correction

为了提高异步电机直接转矩控制(DTC)系统弱磁升速性能,提出了一种基于主动磁链修正的异步电机六拍转矩控制方法。首先分析了传统异步电机直接转矩实现机理,并指出DTC内在固有的过调制特性;在此基础上,为了进一步提高DTC系统转矩输出能力,介绍了基于主动磁链修正的六拍转矩控制的实现过程,其经过了三矢量、两矢量和单矢量的演变,对应定子磁链由运行磁场由圆形变化为六边形。最后,基于45 k W高速异步电机样机平台进行测试与分析,结果表明主动磁链修正的DTC可有效拓宽电机恒转矩运行区域。同时,弱磁升速过程中驱动系统的电压、电流均运行于最大值,保证了逆变器的最大利用率和最大转矩输出能力。

In order to improve DTC for asynchronous motor system weak magnetic speed-speed performance, six-beat torque control method based on active flux correction was proposed. The traditional asynchronous motor directly turned moment achieved mechanism was analyzed, and DTC inner inherent of over modulation characteristics was pointed out ; to further improve DTC system turned moment output capacity, based on active magnetic chain amendment of six took turned moment control of achieved process was introduced, its after has three vector, and two vector and single vector of evolution, corresponds to stator magnetic chain by run magnetic field by round changes for hexagon. Finally, based on a 45 kW asynchronous motor, results show that DTC active flux correction can effectively broaden motor with constant torque operating area. In speed-up process, weak magnetic drive system voltages and currents are running at maximum value to ensure the maximum utilization of the inverter output and maximum torque capacity.