Transverse flux permanent magnet machine (TFPM) is well known for its achievable high torque density and flexible topologies, which makes it especially suitable for wind power generation, electric vehicle and direct drive area. Existing TFPM topologies, however, are subject to high flux leakage and cogging torque. This paper deals with the design and optimization of a three phase surface mounted transverse flux permanent machine (SM-TFPM) to reduce flux leakage and cogging torque, the solutions of adjusting the interval between magnets and inserting auxiliary stator are suggested to realize the restriction of both flux leakage and cogging torque. The finite element analysis (FEA) results show the obvious effects, and the FEA design is validated via prototype experiment by using TMS320F28335 based controller and induction machine load. Based on the abovementioned researches, a further multi-objective optimization is applied by using differential evolution (DE) algorithm and the optimization results are compared with the previous design to demonstrate the improved performance
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