Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1980-09-25
1982-02-16
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
335234, H01F 708
Patent
active
043161677
ABSTRACT:
A moving system constituted by a permanent magnet and pole-pieces is accurately guided in axial translational motion within the coil unit of an electromagnet and enclosed within a coil form member, the axis of magnetization being perpendicular to the axis of the coil unit. Air-gap zones are located at both ends of the coil unit and a stationary yoke surrounds the two ends of the coil. Flat portions of the yoke which are parallel to the axis of magnetization each penetrate respectively into one air-gap zone so as to ensure that, at least in one stable position of the moving system, a flat portion of the yoke is in contact with one of the pole-pieces while the other flat portion is in contact with the other pole-piece. Better magnetic coupling between the coil, the air-gaps and the permanent magnet as well as higher operating efficiency are achieved.
REFERENCES:
patent: 2633488 (1953-03-01), Brion et al.
patent: 2895090 (1959-07-01), Short
patent: 3504315 (1970-03-01), Stanwell
patent: 3728654 (1973-04-01), Tada
patent: 4142166 (1979-02-01), Arnoux
Harris George
La Telemecanique Electrique
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