关键词: 高速永磁同步电机, 单电流调节, 弱磁控制, 电压限幅

Abstract: Flux weakening is an effective measure to improve the speed regulation capability of HS-PMSM ( high-speed permanent magnet synchronous motor) . Under the traditional voltage feedback flux weakening control strategy, the control system contains two current regulation loops, and the d-q current coupling will increase with the increase of speed, resulting in poor control performance of high-speed drive, and even system instability in serious cases. In order to solve the problem, a new single-current field weakening control strategy was proposed based on voltage limiting in combination with the load characteristics of the compressor motor. By dynamically limiting the amplitude of the q axis voltage, the natural transition
between the dual-current regulation mode at the middle and low speed and the single-current regulation mode at the highspeed field weakening was realized under a control topology. The simulation and experimental results verify the effectiveness of the proposed method. Compared with the traditional voltage feedback field weakening control method, it can better solve the high-speed current coupling problem and improve the dynamic response of field weakening.

Key words: high-speed permanent magnet synchronous motor ( HS-PMSM ), single-current regulation, field weakening control, voltage limiting