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考虑到内置式永磁同步电机（IPMSM）滑模观测器易受 d、q 轴电感差异的影响，提出了一种 IPMSM的 Lq 模型，并构造了 IPMSM在 Lq 模型下的合成反电动势，设计了基于合成反电动势的滑模状态观测器，同时采用两级滤波器串联的方式来提取反电动势信息，并采用变截止频率调节的方法实现恒相位补偿，采用锁相环技术实现系统的高速运行。然后在电机起动时采用相应的控制方法以满足不同的应用要求，并在低、中速切换时采用了一种新的切换策略以实现系统的平稳切换。在一台 IPMSM上的实验结果表明，文中提出的滑模无位置传感器控制算法、起动控制选择及主动切换策略能实现 IPMSM在宽速阈范围内的无位置传感器高性能控制，从而验证文中所提控制算法的有效性。“,”As the sliding mode observer of the interior permanent magnet synchronous motor (IPMSM)is easily af-fected by the d/q-axis inductance difference,this paper proposes an Lq model of IPMSM,constructs a synthetic back EMF of IPMSM under the Lq model,and designs a sliding mode state observer based on the synthetic back EMF.Meanwhile,the back EMF information is extracted through the two-stage filter method,the constant phase compensation is realized by means of the variable cutoff frequency method,and the high-speed running of system is achieved by using a phase locked loop technique.Then,corresponding control strategies are adopted to meet vari-ous requirements for actual applications when the motor starts.Moreover,a new switching strategy is presented for realizing smoothly and steady switching of system at low-to-medium speed switching.Experimental results on an IPMSMindicate that the proposed sliding-mode sensorless control algorithm,the starting control selection and the initiative switching strategy can realize the sensorless high-performance control of IPMSM within a wide speed range.Thus,the effectiveness of the proposed control algorithm is verified.