Moving magnet torque motor
AssigneeNutfield Technology, Inc.
InventorBrian P. Stokes
Life of this patent
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Abstract
A torque motor configuration that minimizes off-axis magnetic forces emanating from adjacent energized coils acting on a magnet. The motor includes a stator comprising a sleeve with conductive coils disposed thereon, and the stator further defining a rotor opening, and a rotor disposed in the rotor opening comprising a magnet disposed on a shaft with the sleeve being shorter than the magnet and the coils including turn around zones beyond respective ends of the sleeve. The motor may be incorporated into an optical scanning system including optical elements for detecting light from a light source.
Claims21
A torque motor comprising:
- a stator defining a rotor opening;
- a sleeve disposed adjacent said stator within said rotor opening;
- a rotor disposed within said rotor opening, the rotor comprising a magnet disposed on a shaft;
- and
- independently wound conductive coils disposed on said sleeve and disposed between said sleeve and said rotor and adjacent to said stator;
- said sleeve being shorter than the magnet and the coils and including the turn around zones beyond respective ends of the sleeve.
An optical scanner comprising:
- an optical element configured to direct light from a light source;
- a torque motor comprising;
- a stator defining a rotor opening;
- a sleeve disposed adjacent said stator within said rotor opening;
- a rotor disposed within said rotor opening, the rotor comprising a magnet disposed on a shaft;
- and
- independently wound conductive coils disposed on said sleeve and disposed between said sleeve and said rotor and adjacent to said stator;
- said sleeve being shorter than the magnet and the coils and including the turn around zones beyond respective ends of the sleeve.
Dependencies are inferred from the claim text.