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

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Sensorless control of ultrahigh-speed PM brushless motor using PLL and third harmonic back EMF

The back EMF waveform at the rotor speed 300 rpm for (a) Total

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Controlling Sensorless BLDC Motors via Back EMF

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Relationship between back-EMF and current waveform.

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Back EMF harmonic content of 39/12(PMSM-2) motor around 100 Hz

Figure 8 from Sensorless control of ultrahigh-speed PM brushless motor using PLL and third harmonic back EMF