Analysis and Realization of Whole Process Electric Rotor Position Detector of a Commutatorless Motor
Du Haijiang1 Shi Xinchun2 (Electric Power University of North China Baoding 071003 China)
Rotor position detector is a key component and is also a weakest link in a commutatorless motor. In order to simplify structure and improve reliability, it is necessary to develop whole process electric rotor position detector to operate from rest to rated speed. Because motor’s terminal voltage vary greatly in frequency and amplitude and have serious wave distortion, this problem has not been solved completely. By detailed analysis of voltages waves, rotor running process is divided into five stages, then clip sampling circuit, several kinds of filter algorithms and two kinds of position detection strategies are designed in this paper. The clip sampling circuit can keep the input signals not to be weakened during motor starting period and avoid high voltages hurting inner circuit during high speed. Filter algorithms include IIR digital filter, mean value filter and maximum probability filter, which are used during different motor running stages. Two strategies of position detection are three-phase correlative algorithm and three-phase irrelative algorithm. The whole process electric rotor position detector is achieved by using a high speed MCU with A/D unit and is tested on a commutatorless motor.
【CateGory Index】： TM306