An outer-rotor traction machine with halbach magnetized permanent magnets and concentrated fractional slot windings

A prototype outer-rotor traction machine with Halbach magnetized permanent magnet structure is introduced. Concentrated fractional slot windings are used to obtain a larger winding factor. The performance studies of the prototype are presented by using finite element analysis models. The flux distributions, torque capability and back emf are investigated. The experimental results match the analysis. The result shows that Halbach magnetized magnet and the fractional slot winding increase the back emf and torque capability of the machine.