Speed-Adaptive Field-Weakening Controller for Permanent Magnet Synchronous Motor Drives in the High-Speed Region

The PI parameter tuning of controllers directly affects the dynamic capability of the permanent magnet synchronous motors (PMSMs) during field-weakening control. To address this point, a speed-adaptive field-weakening controller is proposed for the wide speed range operation of PMSMs. Based on the internal model current loop, the simplified structure of the field-weakening loop is designed to improve the decoupling performance. Then, the speed-adaptive voltage controller is presented to achieve tuning of PI parameters. The experimental results verify that the speed-adaptive approach can extend the speed range with enhanced transition during field-weakening control.