Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Reexamination Certificate
1997-10-20
2002-10-29
Barrera, Ramon M. (Department: 2832)
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
C335S272000
Reexamination Certificate
active
06472967
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an actuator capable of reliably stopping a moving member, e.g. a rotor, at a predetermined position according to the coil current without a need of a mechanical element for producing counterforce, such as a spring.
2. Description of the Prior Art
In general, a rotary solenoid is used to control the position of a moving member, e.g. a rotor, according to the coil current. This type of rotary solenoid has a basic arrangement in which a rotor which is formed from a permanent magnet is disposed between a pair of opposing magnetic pole pieces, and the rotor is rotated by using magnetic flux from a magnetic source produced according to the operating current.
In this case, in order to control the rotor to a desired position, a spring which is adapted to produce a counterforce proportional to the rotor position is used in combination, and a stop position of the rotor is determined by the balance of the torque induced according to the coil current and the counterforce of the spring.
The above-described conventional apparatus needs a mechanical element, e.g. a spring, and consequently involves problems in terms of reliability, e.g. vibration and wear of the operating part.
SUMMARY OF THE INVENTION
In view of the above-described problems of the prior art, an object of the present invention is to provide an actuator improved in reliability by eliminating the need of using a mechanical element such as a spring.
REFERENCES:
patent: 4103191 (1978-07-01), Kawamura et al.
patent: 4141210 (1979-02-01), Flaig
patent: 4542329 (1985-09-01), Tu Xuan
patent: 4992685 (1991-02-01), Boon et al.
patent: 5334893 (1994-08-01), Oudet et al.
Barrera Ramon M.
Mikuni Corporation
Varndell & Varndell PLLC
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