Abstract:
The inductances of a multi-phase electrical machine are key parameters for the performance
analysis of the machine. Commonly, apparent inductances are employed. This, however, is
incorrect when the non-linear characteristic of the magnetic core of the machine is considered in
dynamic analysis. Instead, the differential inductances should be employed in non-linear
analysis. A numerical method for calculating the differential inductances is presented in the
paper and it is used for the prediction of the inductances of a tubular linear permanent magnet
(PM) actuator. The measurement of the inductances of the prototype is also carried out for the
verification of the method.
