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A direct torque-controlled interior permanent-magnet synchronous motor drive without a speed sensor

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4 Author(s)
Rahman, M.F. ; Sch. of Electr. Eng. & Telecommun., Univ. of New South Wales, Sydney, NSW, Australia ; Zhong, L. ; Haque, Md.E. ; Rahman, M.A.

This paper reports results of further investigation of the so-called direct torque control (DTC) technique to an interior permanent magnet (IPM) synchronous motor drive. This torque control technique for IPM motors requires no dq-axes current controllers and coordinate transformation networks. A completely sensorless IPM motor drive with DTC, which uses a new speed estimator from the stator flux linkage vector and the torque angle, is presented. It is shown that including the torque angle in the estimation process results in a far more accurate transient speed estimator than what is reported in the existing literature.

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Energy Conversion, IEEE Transactions on  (Volume:18 ,  Issue: 1 )