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Field-oriented vector control of synchronous motors with additional field winding

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3 Author(s)
Saleh, K.I. ; Dept. of Electr. Comput. Eng. Dept., Florida Int. Univ., Miami, FL, USA ; Mohammed, O.A. ; Badr, M.A.

This paper presents a new method to control a synchronous motor in such a way to resemble the characteristics of a DC motor. The method suggests including a second field winding to the rotor of a voltage-source-inverter-fed synchronous motor. The angular frequency of the inverter is made equal to the angular rotor speed, (of a self-controlled synchronous motor drive). The added field winding is in space quadrature to the main field winding and is properly excited in such a way as to diminish the direct axis component of the stator current at every load conditions. The motor is controlled to operate with zero power angle from the inverter side and zero direct axis current from the rotor excitation side. Therefore, it operates with minimum stator current and with unity power factor. The addition of the second field winding will not complicate the design because it is just a control winding. This winding may be made with smaller wire cross-section and a larger number of turns. The control on this winding is not complicated and it can be easily created. The synchronous motor along with the added field and the required control loops are simulated and tested extensively. The test results show excellent motor performance in motoring and regenerating modes of operation.

Published in:

Energy Conversion, IEEE Transactions on  (Volume:19 ,  Issue: 1 )

Date of Publication:

March 2004

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