Patent
Limited rotation motor
TLDR
In this article, a limited rotation motor has a stator and a rotor mounted for limited rotation relative to the stator, and a drive system produces drive flux which is conducted through magnetic circuits that extend across air gaps between the stators and rotor to drive the rotor.Abstract:
A limited rotation motor has a stator and a rotor mounted for limited rotation relative to the stator. The stator is constructed to conduct bias flux through magnetic circuits that extend across air gaps between the stator and the rotor and a drive system produces drive flux which is conducted through magnetic circuits that extend across air gaps between the stator and rotor to drive the rotor. The stability of radial rotor position in its support bearings is enhanced by an imbalance in the bias flux magnetic circuits which continually produces a resultant radial force on the rotor so that a well defined radial position of the rotor is maintained over the range of limited rotation that the rotor moves in response to the drive system.read more
Citations
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References
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Patent
Limited rotation motor with velocity sensing system
TL;DR: In this article, a velocity sensor structure is axially spaced from a drive structure that is shorter than another drive structure of the drive system and cooperates with it and a coextensive portion of the rotor in defining flux paths.