Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1979-11-20
1982-05-11
Duggan, Donovan F.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
335230, 310 36, H01F 708
Patent
active
043296726
ABSTRACT:
A polarized electromagnetic drive preferably for actuating a turning servo valve comprises an electromagnetic field iron core which has a central open area and a core receiving recess defined in said core on each side of the open recess with a coil therein and with a rotatable armature drive shaft located in the open area of the core which has an armature affixed thereto with a pair of diametrically opposite radially extending arm portions. The core also has a leg portion which is spaced away from each side of the armature arm portions by an amount to define a large air gap between each side of each arm portion and each leg portion. Each of the leg portions has an end part extending outwardly from the associated leg portion and alongside the outer ends of the armature arm portions and spaced from the outer ends by an amount to define a small air gap between each end part and the associated outer end of the armature arm portions. The core has end pieces which extend outwardly from behind each leg portion on each side of the leg portions and which define a permanent magnet receiving recess therebetween alongside each leg portion on each side of the armature arm portions. A permanent magnet is disposed in the permanent magnet receiving recess and is opposed to and spaced from each end of each arm portion. The large and small air gaps which are formed between the armature and the field iron parts are such that the force components of the large and small air gaps result in a total force having a range of linearity which is greater than the range of linearity of the individual force components.
REFERENCES:
patent: 2930945 (1960-03-01), Weathers et al.
patent: 3270219 (1966-08-01), Trouilhet
patent: 4135119 (1979-01-01), Brosens
Stahl Heinz
Wagner Harald
Duggan Donovan F.
Elektro-Mechanik GmbH
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