Reduction of cogging torque in transverse flux machines by stator and rotor pole shaping

This paper presents a method of reducing the cogging torque of transverse flux machines by shaping the poles of the rotor. A number of different techniques are presented and simulated. These simulations are verified by the construction of a number of rotors from which measured results have been obtained. Further to this, the rotors are applied to machines with different cogging torque reduction techniques applied to the stator. Measurements of cogging torque have been taken in order to assess the overall effectiveness of each technique.