无注入式转子位置估计误差补偿用于简化凸极高速永磁同步电机无传感器驱动

High power density is the distinguished advantage of high-speed permanent magnet synchronous machines (HSPMSMs), which will even be improved by the saliency introduced due to the artificially asymmetric magnetic circuit, namely, different d- and q-axis inductances ( L_d / L_q ). Furthermore, for the salient PMSM sensorless drive, the low switching-to-fundamental frequency ratio (SFFR) makes the accurate rotor position estimation more complicated. Present algorithms require extensive nonlinear matrix computations, which are not convenient for large-scale applications. Although silicon carbide (SiC) devices are employed to address the low SFFR issue, the improved cost usually limits its applications. As a compromise, a salient PMSM can be assumed as a nonsalient one, and consequently, the phase winding inductance L_s is approximately calculated by L_s=(L_d+L_q) /2. Such assumptions will inevitably cause rotor position estimation errors, and hence, in this article, a current ripple sampling (CRS)-based method is proposed to identify the error. It should be noted that such a method is injection-free, dead-time effect (DTE)-immune, and detection-free. Furthermore, the identified position errors can be smoothly compensated by noise suppression filters [e.g., recursive autoregressive least-squares method (LSM)] and closed-loop regulations (e.g., PI controllers). Finally, experimental validations are conducted on a prototype with 45 kr/min used for hydrogen pumps.