Homopolar, hybrid and consequent-pole bearingless motors
Osamu Ichikawa
Bearingless motors can be classified into several groups. The major group produces suspension force by the interaction of n-pole and (n ± 2)-pole fluxes (or p-pole-pair and p ± 1-pole-pair). However, homopolar and hybrid bearingless motors belong to another group where the suspension force is generated by the interaction of a homopolar flux and a 2-pole flux, which is similar to the homopolar type of radial magnetic bearing, although the theory of operation can be unified by considering the homopolar airgap flux as a flux wave with zero pole number.
In this chapter, the structures and characteristics of homopolar, hybrid and consequent-pole bearingless motors are described. ...
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