There are various applications of permanent magnet brushless DC motor (BDCM). They o er a number of attractive features and could meet the requirements coming from new generation satellites such as high attitude precision, high maneuver capacity and high stability. Therefore, high speed magnetically suspended inertia devices using BDCM is becoming the best choice for inertia actuators. In this paper, design principles including hollow cup BDCM electromagnetic design method and optimized structural design methods are reviewed. Also, the control methods of high speed BDCM used for magnetically suspended ywheel (MSFW) including PLL method, double mode control method and current restraint method are reviewed. The worldwide applications of high speed BDCM in magnetically suspended inertia actuators are considered.
It is very important to accurately detect rotor position and speed in brushless direct current motor (BLDCM) . Aiming at BLDCM which drives the magnetic suspended reaction flywheel (MSRFW), a novel scheme to estimate the low speed of the BLDCM based on Hall sensors and Kalmam fluter is presented. The average speed over the previous sector is achieved according to the outputs of the three hall sensors, then rotor position of the next sector is computed at the sampling time. The electrical angle calculated can be used to estimate the transient speed with Kalman filter equation.Simulation and experiment show that the proposed method is valid.
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