Recently, vector controlled synchronous machine has been established as universal servo drive widely used. However, its theoretical achievement is not clear enough and unified for various types of the synchronous machines. This paper tries to give an unified theory for them and gives their vector diagrams for adjustable speed operation in concise form, for the first time, where normalized reactance drop locus plays the important role.
Novel approach for operation analysis of vector control synchronous machine has been described. To draw the vector diagram under adjustable speed operation, the concept of normalized voltage has been introduced. It is to divide the voltage value by angular frequency of the machine, then the voltage vectors, which contain angular frequency immanently, will not change their length under adjustable speed operation, and the vector diagram will keep its size unchanged for the whole speed range. Also, reactance drop locus and its accompanying yardstick circle for determining current phase angle, in corresponding to the variation of the given armature current vector, were deduced. Then, the operation of the machine for the whole adjustable speed range can be represented in single diagram. As the accompanying matters, the methods for calculating the operating characteristics of maximum torque control and 100 % power factor control were shown.
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