Reduction of Cogging Torque and EMF Harmonics in Modulated Pole Machines

Washington, JG; Atkinson, GJ; Baker, NJ

doi:10.1109/ICELMACH.2014.6960191

Reduction of Cogging Torque and EMF Harmonics in Modulated Pole Machines

Lookup NU author(s): Glynn Atkinson, Professor Nick Baker ORCiD

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Abstract

This paper discusses a method for reducing cogging torque and harmonic content of back EMF waveforms in modulated pole machines (MPMs). Tooth pitching is applied to a separate phase MPM in order to reduce the most prominent harmonics present in a three-phase MPM's cogging torque. Experimental results show that the application of tooth pitching to these machines can reduce the cogging torque and back EMF harmonics significantly; this comes without a significant impact to the useful output of the machine and without the need for extra components. Such a technique can be easily applied to existing machine designs without increasing the production cost.