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Stator-flux-oriented vector control of synchronous reluctance Machines with maximized efficiency

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3 Author(s)
Hofmann, H.F. ; Dept. of Electr. Eng., Pennsylvania State Univ., University Park, PA, USA ; Sanders, S.R. ; El-Antably, A.

This paper presents a position-sensorless vector torque controller designed to achieve maximum efficiency over a range of power and rotational speed for a synchronous reluctance machine. A model of the synchronous reluctance machine is presented which incorporates both winding and core losses. It is then shown that a stator-flux-oriented control scheme can achieve synchronous operation of the machine without a position sensor at medium and high electrical frequencies. For a given speed and torque, power losses in the machine are shown to be a function of only the stator flux magnitude. As the power losses are a convex function of the stator flux level, the optimal flux value can be found using a one-dimensional optimization algorithm, such as the Method of Sequential Quadratic Interpolations. Optimal flux values for a synchronous reluctance machine are determined using an experimental setup that accurately determines losses in the motor/drive system. Experimental results obtained from the test setup confirm the validity of the controller and the optimization algorithm.

Published in:

Industrial Electronics, IEEE Transactions on  (Volume:51 ,  Issue: 5 )

Date of Publication:

Oct. 2004

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