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Practical operation of a bearingless permanent magnet-type synchronous motor (BPMSM) owes to stable suspension of the rotor. With the variation of operating conditions, conventional PID controller can't adjust its parameters, and the overshoot of the system response is big. Based on rotor flux orientation, a fuzzy self-adaptive PID controller was designed to control the suspending subsystem of a BPMSM...
This paper presents a novel method for sensorless brushless dc (BLDC) motor drives. Based on the characteristics of the back electromotive force (EMF), the rotor position signals would be constructed. It is intended to construct these signals, which make the phase difference between the constructed signals and the back EMFs controllable. Then, the rotor-position error can be compensated by controlling...
This paper presents a novel method for sensorless BLDC motor drives, which is based on coordinate transformation, in order to compensate the rotor position detection error caused by the first-order low-pass filter over wide speed ranges. Two coordinate systems are defined, which are named as `a' and `b'. For compensating the error, the angle beta, which is between `b' coordinate system and `a' coordinate...
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