Abstract:In order to implement brushless DC machine (BLDCM) servo system in a high-temperature hostile environment, a novel electromagnetic BLDCM rotor position sensor is put forward. Concentrated excitation windings are symmetrically mounted at the middle of the stator inner circumference notches and the detection ones were wound around the stator teeth. The rotor cylinder outer surface is cut to form sunken right-angled sectors at the corresponding positions of the magnetic S poles on the machine rotor. With the magnetic field excited by a relatively high frequency sinusoidal current, the detected signals are modulated by the machine rotor position, as the total mutual inductance between one detection windings and all the excitation ones varies as a function of the sensor rotor position. As all magnetic iron cores are laminated from new soft magnetic alloy ultra-thin sheet, the excitation current frequency may be increase to 100kHz. Moreover a linear model and an equivalent- magnetic-circuit model are set up and based on the later, the sensor geometry parameters are optimized by a simulated annealing algorithm. A finite element analysis is done in ANSYS software program and an experiment system is also built up. Both the simulation and the experimenal results reveal the validity and reliability of the whole scheme.
符强, 林辉, 王永宾, 崔璀. 恶劣环境中的新型无刷直流电机转子位置传感器[J]. 电工技术学报, 2009, 24(8): 69-76.
Fu Qiang, Lin Hui, Wang Yongbin, Cui Cui. Novel Electromagnetic Rotor Position Sensor for Brushless DC Machine in Hostile Environment. Transactions of China Electrotechnical Society, 2009, 24(8): 69-76.
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