Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1988-08-01
1989-07-11
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
335230266, H01F 708
Patent
active
048475815
ABSTRACT:
Disclosed is a dual working airgap force motor. A centrally located stator includes two toroidally shaped electromagnets wherein the axis of the stator coincides with the axis of the toroids, each toroidal coil is separated from the other toroidal coil by an axial distance. Toroidal permanent magnets are also mounted preferably inside the toroidal electromagnet coils and also spaced apart in an axial direction. The permanent magnets generate a flux flow in opposite axial directions whereas, upon energization, the toroidal coils generate flux flow in the same axial direction at a given radial position. Two armatures are located on an output shaft, in a preferred embodiment at either end of the stator, and each armature is spaced apart from the stator by inner and outer axial airgaps. Energization of the coils with current causes a greater flux flow across the inner and outer airgaps at one end than is caused through the inner and outer airgaps at the other end tending to reduce the airgap at the end with the largest flux flow consequently causing movement of the respective armatures and the output shaft upon which they are mounted.
REFERENCES:
patent: 4604599 (1986-08-01), Koghler
patent: 4635016 (1987-01-01), Guery et al.
Force Motor-Bertea Control Systems, Div. of Parker Hannifin Corp. Taken from AFWAL-TK-84-2085, vol. II, "Flight Worthiness of Fire Resistant Hydraulic Syts".
Harris George
Lucas Ledex Inc.
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