A Novel Approach to High-Speed Sensorless Control of Switched Reluctance Motor Using Fourth Order Generalized Integrator Without Magnetic Characteristics

The high-speed sensorless control of the switched reluctance motors (SRMs) is achieved by pre-storing flux linkage characteristic parameters. However, creating an accurate table of nonlinear flux linkage characteristics necessitates time-consuming offline measurements. Additionally, this approach burdens the system and consumes a significant amount of memory. To address the issue, a high-speed position sensorless control scheme without magnetic characteristic parameters is proposed using Fourth Order Generalized Integrator (FOGI). Without requiring pre-stored flux linkage characteristics, this method accurately estimates real-time position information. The proposed FOGI effectively extracts the fundamental flux linkage, eliminates DC bias and harmonics from the calculated flux linkage, and separates the highly nonlinear flux linkage into two position quadrature signals. Furthermore, the high-order properties of FOGI exhibit excellent filtering characteristics and anti-interference performance. Using a three-phase phase-locked loop (PLL), the rotor speed and position of the SRM could be estimated from the quadrature signals. The proposed sensorless control method is validated through the three-phase SRM experimental setup. The results indicate that the proposed sensorless control method has high estimation accuracy, excellent anti-interference ability, and universality under the premise of unknown magnetic characteristics.