DESIGN CONSIDERATIONS FOR HIGH-SPEED SENSORLESS PERMANENT MAGNET BRUSHLESS DC MOTORS

摘要

There is increasing interest in high-speed, viz. >100krpm, permanent magnet, brushless DC motors for a wide range of applications. There is also significant interest in sensorless operation by detection of the zero-crossings of the back-emf waveforms, for which a number of IC's are available commercially. This paper describes some electromagnetic and mechanical design considerations specifically in relation to the sensorless operation and rotor resonances of 120krpm high-speed brushless DC motors.