Soft T/F and Transition to Sensorless Control Based on the Torque Angle of a Compressor-Driven IPMSM

다국어 초록 (Multilingual Abstract)

This paper presents a soft Torque/Frequency (T/F) starting and transition method to the closed-loop sensorless control of Interior Permanent Magnet Synchronous Motors (IPMSMs) in Electric Vehicle (EV) air-conditioning compressors. The main objective is to enhance the quietness during the starting, stopping, and transition phases from T/F starting to closedloop sensorless control. To achieve this, the paper proposes an instantaneous speed-controlled T/F starting approach based on a torque reference model. Additionally, a torque decline function based on the torque angle is presented for the transition to closed-loop sensorless control. During the starting phase, the proposed T/F model incorporates an ofset starting torque and an accelerating coefcient to the maximum starting torque. As the motor accelerates, the instantaneous torque reference is adjusted to minimize speed ripple and vibrations in the compressor. Once the T/F target speed is reached, the speed is controlled by the T/F angle to minimize current errors. During the transition from T/F starting to closed-loop sensorless control, the reference T/F torque is gradually decreased using an angle error function. This reduction aims to shorten the transition time and ensure a smooth transition with reduced current ripple. By comparing the torque diference, the reference torque in T/F mode rapidly declines to synchronize with the actual rotor position. As a result, the transition occurs with minimized current and speed ripple. The efectiveness of the proposed soft T/F and transition control method for IPMSMs is validated through experiments conducted on a practical Heating, Ventilation, and Air Conditioning (HVAC) system in an EV setting. The experimental results demonstrate that the proposed method efectively reduces mechanical vibrations and achieves smoother transition control, compared to that of the conventional I/F method.

참고문헌 (Reference)

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