Analysis and Design of a Concentrated Wound Stator for Synchronous-Type Levitated Motor

A new method of levitation control of a synchronoustype motor has been introduced, that is, the radial position as well as the rotation of a PM rotor can be controlled Foranalysis the rotoris assumed to have asinusoidally distributed magnetic flux, while the stator is assumed to be a current sheet which can produce an arbitrarily current distribution. The levitation force can be produced by adding the plus minus two pole magnetic flux on the stator in addition to the usual motoring flux. This paper introduces the analysis of the least number of stator poles. The stator flux is assumed to be produced by the concentrated wound poles which produce the spatial higher harmonics. The rotor is assumed to have pure sinusoidal distributed flux which can be produced by permanent magnets. Increasing the pole number gives a better solution, but the motor becomes complicated and expensive. A practically recommended least pole number is introduced and tested experimentally.