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Unbalanced radial force acting on a rotor shaft is undesirable because it causes motor vibrations. Yet, motor vibrations can be reduced with intentionally produced shaft radial force which cancels the existing unbalanced radial forces due to a non-uniform air gap or external load. Due to its special structure, the shaft radial force and torque of a switched reluctance motor can be separately controlled...
This paper presents the design, analysis, and implementation of a high performance and cost effective sensorless control scheme for the extensively used brushless DC motors (BLDCMs). Taking into consideration cost and ease of implementation, the commutation signals are obtained without the motor neutral voltage, multistage analog filters, A/D converter, and the complex digital phase shift (delay)...
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