Stable sensorless transition algorithm for PM synchronous motors under load
Journal of Power Electronics(2024)
摘要
The back EMF-based sensorless control of PMSMs is widely applied to the blowers and hermetic compressors of heating, ventilation and air-conditioning (HVAC) systems. For the sensorless control of PMSMs, a smooth transition from the I-f startup to the closed loop speed control with a rotor speed estimator is required. This paper proposes a smooth transition algorithm that can minimize torque and speed fluctuations under all load conditions. At the starting of a transition, the dq current based on the reference rotor position for I-f control is switched to the dq current with the estimated rotor position. The operating point of the dq current moves from I-f control to MTPA (maximum torque per ampere) operation, while the dq current follows a constant torque curve. Experimental results show that the torque and speed fluctuations under the proposed transition algorithm were significantly reduced under all load conditions.
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关键词
PM synchronous motor,Sensorless control,I-f control,Sensorless transition,Back EMF-based estimator
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