Due to the limitation of traditional induction motor drive control strategy,it was difficult to be used in pure electric vehicle system.In order to solve this problem,a sensorless drive control scheme was designed for induction motor based on sliding mode observer.The new method could estimate the motor speed and flux accurately by a fixed boundary layer sliding mode observer without the speed and voltage sensor,and did not need to know the load torque,while minimize the chattering.An indirect vector control strategy with feedforward compensation was used to improve the transient performance of the system.The experiments had been taken with the induction motor driven system.The test results show that the controller has high accuracy of speed estimation in a wide range,while the vehicle has better transient performance of speed instruction cycle,and has good robustness to the disturbance of parameters.%由于传统感应电机驱动控制策略存在性能上的局限,故难以用于纯电动汽车系统.针对该问题,设计了一种用于电动汽车的基于滑模观测器的感应电机无速度传感器驱动控制方案.采用了固定边界层滑模观测器来对电机的转速和磁链进行较为精确的估计,无需使用速度和电压传感器,且不需知道负载转矩,同时降低了转矩脉动.方案中结合使用了带前馈补偿的间接矢量控制策略,提高了系统暂态性能.最后,开展了感应电机驱动试验,试验结果表明控制器的转速估计在较宽的范围具有较高的精度,同时在车辆行驶转速指令循环中保持了较好的暂态性能,并对参数的扰动具有较好的鲁棒性.
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