Simplified method for optimizing round-rotor synchronous machines for operation on non-sinusoidal voltages

The paper describes a simplified method for optimizing some design parameters of round-rotor synchronous machines fed by static converters. The proposed method can be applied to machines fed with arbitrary voltage waveforms, which are imposed by the power converter. It is based on a description of the machine and converter by means of space vectors, allowing the inclusion of the effects of higher space and time harmonics. It aims to optimize the steady state mean torque, keeping the same amount of losses in the machine and converter. The method was successfully implemented in a MATHCAD file taking as example a machine of 10 kW fed by an inverter with six pulse voltage waveform. The obtained design curves, as well other results, are presented and discussed. The method has proved helpful in choosing the best design parameters for machines intended to be fed by inverters