Abstract
It is almost impossible to measure the starting performance of middle and large synchronous motors in a factory, because it needs a large capacity of equipments to test its performance.
A new method is required to predict this performance by simple tests using a small capacity. This will make the motor's design and its accessories more rationalized.
Authors propose a new method which is the combination of single phase AC applied test and usual routine test of synchronous machines.
The key points of this method are summarized as follows:
(1) The armature winding leakage reactance is resulted from the no-load saturation curve, the short-circuit characteristic curve and the armature-reaction magnetomotive force converted to the field current (design value).
(2) A single phase voltage with commercial frequency is applied to armature terminals in a standstill condition. And this test must be performed twice, one for short-circuiting the field winding, the other for joining a resistance between the field terminals. Using these two test data including input power, the field and the damper winding impedances are separated from each other.
The starting performance of a synchronous motor is predicted and agreed with actual data.
