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US 6,472,967 B1Granted
Actuator using a magnetic circuit to produce a counterforce
AssigneeMikuni Corporation
InventorTetsuo Muraji
Life of this patent
Estimating the term…
Abstract
An actuator for rotating (or moving) a rotor (or a moving member) according to the current flowing through an electromagnetic coil. Magnetic energy of magnetomotive force induced in the electromagnetic coil when energized is stored in an air gap and a sub-air gap provided in a magnetic path. The rotor (or the moving member) comes to rest at a position where the stored magnetic energy becomes the smallest. The stored magnetic energy serves as a source of counterforce and functions in the same way as a spring.
Claims3
An actuator comprising:
- a pair of magnetic pole pieces facing each other across two sub-gaps, said magnetic pole pieces forming a main gap, and said main gap being arranged between said two sub-gaps;
- a magnetic element for magnetically connecting together said magnetic pole pieces having at least one portion facing one of said pair of magnetic pole pieces across a third gap, said magnetic pole pieces being magnetically connected through said at least one portion to said magnetic element for magnetically connecting together said magnetic pole pieces;
- a magnetic source arranged proximate to said magnetic element;
- and
- a moving member formed from a permanent magnetic, said moving member disposed in said main gap and movable relative to said magnetic element together with a driving shaft as one unit.
2 more elements
An actuator comprising:
- a pair of magnetic pole pieces facing each other across two sub-gaps, said magnetic pole pieces forming a main gap, and said main gap being arranged between said two sub-gaps;
- a magnetic element for magnetically connecting together said magnetic pole pieces, said magnetic element separated from said magnetic pole pieces by a third gap and said magnetic element having at least one portion facing one of said pair of magnetic pole pieces across said third gap, said magnetic pole pieces being magnetically connected through said at least one portion to said magnetic element for magnetically connecting together said magnetic pole pieces;
- a magnetic source arranged proximate to said magnetic element;
- and
- a moving member formed from a permanent magnet, said moving member disposed in said main gap and movable relative to said magnetic element together with a driving shaft as one unit.
2 more elements
Dependencies are inferred from the claim text.