Initial Position Detection of Rotor Magnet and Energizing Phase without sensors of Brushless Permanent Motor
首发时间:2007-10-31
Abstract:Rotor position detection is essential for phase commutation in brushless permanent motor drives. Sensorless commutation techniques can be categorized by methods using back electro-motive force (BEMF), inductance and impedance, and the microprocessor based computation method [1]. Among all of them, the back EMF method is preferred to others because of its simplicity. But the back EMF detection method can not be easily applied in cases of start stage or low speed running because the BEMF signals are so small. Enhanced schemes based on the general method of measuring inductance have been developed for detecting the initial position of the rotor without position sensors. To detect the magnet rotor position, Owen’s bridge method has been used for Y-winding motors where two phases are energized, and the inductance bridge method has been used for center-tapped winding motors where one phase is energized. Their configurations and application have been discussed.
keywords: Brushless permanent motor, Commutation, Back Electro-Motive Force (BEMF), Rotor, Inductance.
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Initial Position Detection of Rotor Magnet and Energizing Phase without sensors of Brushless Permanent Motor
摘要:Rotor position detection is essential for phase commutation in brushless permanent motor drives. Sensorless commutation techniques can be categorized by methods using back electro-motive force (BEMF), inductance and impedance, and the microprocessor based computation method [1]. Among all of them, the back EMF method is preferred to others because of its simplicity. But the back EMF detection method can not be easily applied in cases of start stage or low speed running because the BEMF signals are so small. Enhanced schemes based on the general method of measuring inductance have been developed for detecting the initial position of the rotor without position sensors. To detect the magnet rotor position, Owen’s bridge method has been used for Y-winding motors where two phases are energized, and the inductance bridge method has been used for center-tapped winding motors where one phase is energized. Their configurations and application have been discussed.
关键词: Brushless permanent motor, Commutation, Back Electro-Motive Force (BEMF), Rotor, Inductance.
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