Phase back-EMF at rated speed. (a) Back-EMF voltage. (b) Harmonic

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Back-EMF waveform of one phase in outer stator at 300 rpm.

Figure 4 from Coupled analysis of brushless DC motor using finite elements method & back electromotive force detecting electrical circuits

Phase back-EMF at rated speed. (a) Back-EMF voltage. (b) Harmonic

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Electromagnetic characteristics: (a) phase back-EMF at 20,000 rpm; (b)