Universal Full-Speed Sensorless Control Scheme for Interior Permanent Magnet Synchronous Motors

This article presents a general-purpose full-speed sensorless control scheme for interior permanent magnet synchronous motors (IPMSMs). By applying a quadratic extended back electromotive force (QBEMF) model, the injection-based and model-based position estimations can be combined into a universal sensorless control strategy for the full-speed operation. At low speed, the QBEMF model acts as a self-demodulator that can extract position information from arbitrary high-frequency currents without using digital filters. Therefore, it is suitable for any type of injection signals and can eliminate the adverse effect of filters. When the injection is removed at high speed, the same QBEMF model can still be used for position estimation, thereby solving the conventional transition issue from low-speed to high-speed sensorless control. In consequence, a unified algorithm is designed to achieve arbitrary injection for low-speed sensorless control and seamless transition across full-speed region. The proposed scheme is hence simpler and more effective compared to conventional full-speed sensorless methods. Finally, the feasibility of the proposed estimation algorithm is verified for a 15-kW IPMSM drive.

Automated summary

This article introduces a general-purpose full-speed sensorless control scheme for IPMSMs using a QBEMF model for a universal control strategy. The QBEMF model acts as a self-demodulator at low speed to extract position information from high-frequency currents without digital filters. At high speed, the same QBEMF model can be used for position estimation, solving the conventional transition issue from low-speed to high-speed sensorless control.