The inductance coefficients of a salient-pole alternator in relation to the two-axis theory

The simplicity of the machine equations in their two-axis form depends upon a certain relation between the inductance coefficients being satisfied. The condition is likely to be fulfilled in a machine having a uniform air-gap, but in a salient-pole machine its fulfilment is open to doubt. The paper contains a theoretical and experimental study of the question: the experimental aspect has required the development of new methods of measuring the machine constants.