A novel starting method for sensorless brushless DC motors with current limitation
作者： C. L. Baratieri , H. Pinheiro
DOI: 10.1109/ICELMACH.2012.6349971
关键词:
摘要: The paper presents a novel starting method for sensorless brushless DC motors. proposed is based on the identification of phase commutation instants using PWM duty cycle deviation around its average maximum value under current control. These variations occur due to back-electromotive force (BEMF) that act as disturbance in control loop. divided two steps: rotor alignment and initial acceleration with DC-link As result, limited safe level high torque can be produced. Even though currents are measured by shunt resistor at DC-link, observability loss prevented proper choice carrier frequency during motor startup. Finally, simulation experimental results presented evidence good performance method.
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