Finite-element assisted method to reduce harmonic content in the air-gap flux density of a high-temperature superconducting coreless rotor generator

An investigation to reduce harmonic content in the air-gap flux density of a high-temperature superconducting synchronous generator with a coreless rotor is reported. Three-dimensional finite-element field simulation has been used to predict the voltage waveform of the machine. A simple technique was applied to guide the design process. This allowed the waveform to be improved using a small number of finite-element models.