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Direct torque control, induction motor vector control without an encoder

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1 Author(s)
Nash, J.N. ; ABB Ind. Syst. Inc., Milwaukee, WI, USA

The basic evolution of direct torque control from other drive types is explained. Qualitative comparisons with other drives are included. The basic concepts behind direct torque control are clarified. An explanation of direct self control and the field-orientation concepts implemented in the adaptive motor model block is presented. The reliance of the control method on fast processing techniques is stressed. The theoretical foundations for the control concept are provided in summary format. Information on the ancillary control blocks outside the basic direct torque control is given. The implementation of special functions directly related to the control approach is described. Finally, performance data from an actual system are presented

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Industry Applications, IEEE Transactions on  (Volume:33 ,  Issue: 2 )