基于改进I/F的PMSM无传感器带载起动研究

Research on Senseless On-load Starting of PMSM Based on Improved I/F

I/F策略起动无传感器永磁同步电机虽然具有一定带载起动能力,但是当起步加速过快或负载转矩与指令电流产生的电磁转矩相差较大时,电机易进入失步状态。对起动阶段电机失步的原因进行分析,通过估算负载转矩设定动态速度指令,提高I/F策略起动电机的速度;再利用坐标系偏差角对切换时闭环电流幅值进行补偿,增强I/F策略起动时的带载能力。对改进的I/F起动策略进行仿真与实验。结果表明:改进I/F起动策略可以实现PMSM从零到峰值扭矩内带载情况下的快速起动。

Although I/F strategy starting the senseless permanent magnet synchronous motor has a certain on-load starting ability,but when the starting acceleration is too fast or the load torque and the electromagnetic torque generated by the command current is greatly different,the motor is easy to enter the out-of-step state.The reasons for motor out-of-step in the starting stage were analyzed,and the dynamic speed command was set by estimating the load torque to improve the speed of the starting motor under the I/F strategy.Then,the coordinate system deviation angle was used to compensate the closed-loop current amplitude during switching,and the load capacity was enhanced when the I/F strategy was started.The simulation and experimental results of the improved I/F starting strategy show that the improved I/F starting strategy can achieve fast starting of PMSM from zero to peak torque under on-load condition.