Brushless DC motor having a stable hydrodynamic bearing system
AssigneeXerox Corporation
InventorRobert J. Kleckner
Life of this patent
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Abstract
A brushless DC motor having a hydrodynamic bearing system includes a stator core having windings arranged thereabout, the stator core rotating about a first center line. The motor further includes a rotor having permanent magnets positioned about an inner diameter thereof, said rotor being rotatable about a second center line. The first center line of the stator core is eccentric to and parallel to the second center line of the rotor such that the magnets exert forces on the stator core which eliminate whirl instability in the rotor.
Claims30
A brushless DC motor comprising:
- a stator comprising a core positioned about a first center line, said core having windings arranged thereabout;
- a rotor having an inner diameter being rotatable about a second center line;
- a shaft supporting said rotor at one end thereof and having an axis collinear with said second center line;
- magnet means positioned about the inner diameter of said rotor for exerting radial and axial magnetic load forces on said stator;
- said first center line of said stator being eccentric to said second center line of said rotor.
The motor as recited in claim further comprising:
- a motor housing, and bearing means for supporting said shaft within said housing.
A brushless DC motor for use in a laser scanner comprising:
- a stator comprising a core positioned about a first center line, said core having windings arranged thereabout;
- a rotor having an inner diameter and being rotatable about a second center line;
- a shaft supporting said rotor at one end thereof and having an axis collinear with said second center line;
- magnet means positioned about the inner diameter of said rotor for exerting radial and axial magnetic load forces on said stator;
- said first center line of said stator being eccentric to said second center line of said rotor.
Dependencies are inferred from the claim text.