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Sensorless flux-weakening control of permanent-magnet brushless machines using third harmonic back EMF

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3 Author(s)

The sensorless control of brushless machines by detecting the third harmonic back electromotive force is a relatively simple and potentially low-cost technique. However, its application has been reported only for brushless dc motors operating under normal commutation. In this paper, the utility of the method for the sensorless control of both brushless dc and ac motors, including operation in the flux-weakening mode, is demonstrated.

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Industry Applications, IEEE Transactions on  (Volume:40 ,  Issue: 6 )