Patent ID: 9356539
Filing Date: 2016-05-31
CPC Classification: H01L,H02K,H02N

Claim Text:
1. A rotary positioning device comprising: a circular magnetic track generating a magnetic field across a circular air gap, at least three multiphase ironless forcers, each said forcer including a plurality of coils at least partly disposed with the circular air gap and each said forcer being operable for generating a levitation force in a levitation direction orthogonal to the circular magnetic track and a drive force in a drive direction along the circular magnetic track, said forcers being arranged at different angular positions along said circular magnetic track, and a controller for providing currents to said forcers for individually controlling the generation of a levitation force and a drive force by said forcers for effecting six degrees of freedom active control of a rotational movement, a tilting movement and a translational movement of said circular magnetic track, wherein for effecting active control of the tilting movement, the controller further for providing currents to two or more of said forcers to provide an additional levitation force on one of said forcers and decrease a levitation force in another one or two of said forcers.