中文摘要：

为了保证内嵌式永磁同步电机在更广的速度范围内运行，提出一种综合的控制方案。在低速段，基于反电动势的控制方案由于反电动势信号很弱，无法从中提取出与转子位置相关的信息。采用高频注入法来提取电机的凸极性信息用来计算转子位置。在中高速段，滑模观测器用来估计电机的扩展反电动势。为了减小速度和位置估计的波动，基于锁相环的估计器代替了传统的反正切方案。为了在两种方案的过度段取得更平顺的控制效果，用于速度估计的位置误差信号由过渡函数给出。仿真结果验证了此方案的可行性和有效性。

英文摘要：

This paper presented a combined sensorless control scheme for interior permanent-magnet synchronous motors （IPMSM） to realize wider range speed estimation. When the IPMSM runs in the low-speed region, the fundamental excitation methods, which utilize the back electromotive force （EMF） as the estimation signal, cannot work properly due to the decreasing EMF value. The HF injection method was used to exploit the anisotropic properties of IPMSM, caused either by the inherent saliency due to machine geometry or by the saturation of the stator iron , to accomplish the sensorless control process. In the medium to high speed region, the sliding-mode observer （SMO） was adopted to estimate the extended EMF of IPMSM. The phase-locked loop （PLL） type estimator replaced the inverse tangent method to better mitigate the oscillations caused by the disturbances. The position error signals obtained from the HF injection method and the SMO method were combined by a transition function to provide smooth transition between the two estimation methods. The simulation results validated the feasibility and effectiveness of the sensorless control strategy proposed in this paper.