Overloadability improvement of electric motorcycle eDrive by using a five-phase PMSM

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This article addresses the replacement of the original three-phase permanent magnet synchronous motor for an electric motorcycle by a five-phase PMSM in terms of improving its overloadability and efficiency. The overloadability improvement is achieved by a novel approach utilizing the fundamental properties of the multiphase windings while keeping possibly most similar magnetic circuit topology. On the basis of previous work, a five-phase machine is designed, manufactured, measured and compared with the original three-phase machine. On the basis of measured data and calculated machine characteristics, the benefits of an increased number of machine phases are discussed as well as the proof of usability and benefits of used design approach.