Abstract
Abstract This paper presents a method for determining the saturation curves in the intermediate axes of salient-pole synchronous machines. In the proposed method, a polynomial function is used to represent the saturation characteristic of the magnetic paths of synchronous machines. The coefficients of this polynomial function could be obtained by applying fitting techniques to the measured d- and q-axis saturation curves of the machines. Using this polynomial function, the saturation curves in the various intermediate axes could be obtained. The accuracy of this method is verified by comparing the measured saturation curves of a microalternator which can be excited from both its d- and q-axis with those calculated using the proposed method. Moreover, the saturation curves in various intermediate axes of two conventional salient-pole synchronous machines, which are usually not measurable, are calculated using this method and there accuracy is verified by using them in investigating the steady-state performance of these two machines.
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