Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1997-06-23
1999-02-09
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
335220, H01F 700
Patent
active
058700102
ABSTRACT:
An electrical actuator for a throttle device has a stator and a rotor, the rotor being coupled to the throttle device and comprising a permanent main magnet. The stator includes in axially extending slots therein auxiliary permanent magnets which interact with the rotor magnet to exert a magnetostatic torque (T.sub.MS) on the rotor which tends to rotate it to a pre-set rest position. The stator also has an energizing coil which when actuated results in an electromagnetic torque (T.sub.EM) on the rotor which is opposed to the magnetostatic torque and causes the rotor to pivot through a limited angle of rotation. The thickness and width of the auxiliary permanent magnets are selected so that the cross-sectional area thereof provides a maximum value of the magnetostatic torque (T.sub.MS) per unit volume thereof, thus minimizing the necessary volume and weight of the auxiliary permanent magnets.
REFERENCES:
patent: 3644763 (1972-02-01), Skorbisch
patent: 4354465 (1982-10-01), Takeuchi et al.
patent: 4804934 (1989-02-01), Finke et al.
patent: 4945330 (1990-07-01), Arita
Donovan Lincoln
Eason Leroy
U.S. Philips Corporation
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