Importance

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Abstract

Radial free play is reduced in rotor bearings of a limited rotation electromechanical actuator of the kind having a stator assembly with a plurality of stator pole faces, a rotor with a plurality of rotor pole faces, two bearings supporting opposite ends of the rotor and means for establishing magnetic flux across the gaps. In various aspects, the stator and rotor pole faces are cylindrical and the central axis of the rotor pole faces is tilted relative to the central axis of the stator pole faces; a region of a gap between the stator and rotor pole faces produces both the radial free-play-reducing forces and at least part of the driving torque; the gap rotor varies in size along its length but nowhere is so great as to have an effectively infinite reluctance; the gap varies continuously along its length; and each bearing has radial free play equal to at least 10% of twice the difference in the diameters of the stator and rotor pole faces.

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First Claim