Selective Harmonic Elimination and Dynamic Enhancement in Magnetic-Characteristic-Free Sensorless Control of SRM Drives at High Speeds

To address the issues of magnetic parameter dependence and insufficient dynamic performance in high-speed sensorless control of Switched Reluctance Motors (SRMs), this paper proposes a sensorless control scheme based on the Delayed Signal Cancellation Flux Observer (DSCFO) for high-speed SRM drives. This scheme improves the dynamic performance while achieving sensorless control, without the need for magnetic characteristics. Due to the superior filtering efficiency of the DSCFO, the proposed observer eliminates the non-linear terms in the calculated single-phase flux linkage and extracts a pair of orthogonal signals with positional information. Following this, the rotor position and speed information are estimated through the Phase Locked Loop (PLL), enabling sensorless control. Finally, experiments are conducted on a three-phase 5.5 kW 12/8 SRM experimental setup to verify the effectiveness of the proposed scheme. Experimental results indicate that compared to other methods, the proposed approach can achieve sensorless control with only single-phase while possessing desirable accuracy and stronger robustness.