Magnetically enhanced variable reluctance motor systems
AssigneePacific Scientific Company
InventorRobert Mastromattei
Life of this patent
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Abstract
Electrically-energized salient stator poles of a variable reluctance motor terminate in stator teeth that oppose the rotor on a rotor surface. Permanent magnets located between adjacent stator teeth, and magnetized transverse to the stator to rotor gap, enhance the motor torque relative to the applied excitation in ampere-turns. Permanent magnets on the rotor are avoided by reversing the magnetization of the permanent magnets from pole to pole and energizing the pole windings to oppose the magnets in four phases 1 1 0 0, 0 1 1 0, 0 0 1 1, 1 0 0 1 during successive steps. In one embodiment, a linear motor utilizes the system by replacing the rotor with a linear actuator.
Claims32
a stepping motor, comprising:
- a stator;
- a plurality of stator poles on said stator;
- a winding on each of said stator poles;
- a plurality spaced stator teeth on said stator poles, each of said stator poles having at least one tooth;
- a mover movable relative to said stator;
- said mover having a plurality of spaced mover teeth located for movement along a first direction past said stator pole teeth;
- a plurality of sections of permanent magnetic material on said stator poles, each of said sections being located adjacent a stator tooth and poled in a direction transverse to the first direction;
- each pole having at least one of said sections, the sections on each of said stator poles being poled transverse to the first direction but opposite to the direction of the poling of the sections on an adjacent stator pole.
A stepping motor system, comprising:
- driving means for producing pulsed voltages;
- a motor coupled to said driving means;
- and including:
- a stator;
- a plurality of stator poles on said stator;
- a winding on each of said stator poles;
- a plurality spaced stator teeth on said stator poles, each of said stator poles having at least one tooth;
- a mover movable relative to said stator;
- said mover having a plurality of spaced mover teeth located for movement along a first direction past said stator pole teeth;
- a plurality of sections of permanent magnetic material on each of said stator poles, each of said sections being located adjacent a stator tooth and poled in a direction transverse to the first direction;
- each pole having at least one of said sections, the sections on each of said stator poles being poled transverse to the first direction but opposite to the direction of the poling of the sections on an adjacent stator pole.
Dependencies are inferred from the claim text.