Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1994-08-31
1998-02-17
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
335232, H01F 700
Patent
active
057195439
ABSTRACT:
A magnetically powered linear displacement device is disclosed which can be used as the highly efficient prime mover. The linear displacement device utilizes a permanent magnet whose flux density can be readily shifted from one of two parallel magnetic paths within the displacement device. A pair of pole pieces made of magnetically soft material abuts portions of the permanent magnet and conducts the magnetic flux in two different magnetic circuit pathways such that the permanent magnet's flux can flow in either direction, and if the magnetic flux is travelling along a first of these parallel paths through a movable armature, that armature will be attracted toward the ends of the pole pieces. If the magnetic flux is then shifted to the second path of these two parallel paths, then that movable armature will not be attracted to the pole pieces, and a compression spring can be used to push that movable armature away from the pole pieces. The magnetic pathways are shifted by use of electromagnetic coils wrapped around certain portions of the pole pieces, such that when a current pulse of a given polarity is directed into these coils, the resultant reluctance of the pole pieces is either increased or decreased to shift the path of the magnetic flux from one of the parallel pathways to the other. When the polarity of the current pulse is reversed, the movable armature is forced to the opposite position of its linear displacement travel. By energizing the electromagnetic coils sequentially with alternating opposite polarities, the movable armatures will move in a reciprocating fashion. In a preferred embodiment, compression springs are utilized to store excess energy available from the non-linear tractive force existing in the permanent magnet, then to advantageously assist in causing displacement to occur during the following portion of the cycle. One or more of the displacement devices can be aligned in a series or parallel configuration so as to provide for increased displacement or increased force output capacity.
REFERENCES:
patent: 5268662 (1993-12-01), Uetsuhara et al.
"The Ideal Magnet-Fully controllable Permanent Magnets for Power and Transport", G.R. Polgreen, Electronics & Power, Jan., 1971, pp. 31-34.
"Introduction to Magnetic Materials", B.D. Cullity, Addison-Wesley Publishing Co., 1972, pp. 608, 646.
"Testing and Measurement of Permanent Magnets", Magnetic Materials Producers Association, 1717 Howard Street, Evanston, Illinois 60202, 1975, pp. 24-25.
Davidson James P.
Donovan Lincoln
Gribbell Frederick H.
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