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Field oriented control of induction machines employing rotor end ring current detection

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4 Author(s)
Matsuo, T. ; Dept. of Electr. & Comput. Eng., Wisconsin Univ., Madison, WI, USA ; Blasko, V. ; Moreira, J.C. ; Lipo, T.A.

The usual method of induction motor torque control uses the indirect field orientation principle in which the rotor speed is sensed and slip frequency is added to form the stator impressed frequency. Unfortunately, the rotor resistance varies as the motor heats up under load thereby changing the rotor time constant which has a deleterious effect on the torque response. In this paper two new field oriented control schemes are presented which employ rotor end ring current detection and thereby remove the dependence of the controller accuracy on temperature so that the controller is entirely independent of rotor time constant variations. The field orientation schemes do not require an incremental encoder for rotor position sensing. The motor torque can be accurately controlled even down to zero speed operation

Published in:

Power Electronics, IEEE Transactions on  (Volume:9 ,  Issue: 6 )