Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1985-09-03
1988-05-24
Harris, George
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
335279, H01F 708
Patent
active
047468874
ABSTRACT:
An electromagnet includes a lightweight movable body in the form of a hollow cylindrical body. The resistances of circulation paths for eddy currents flowing in the movable body due to electromagnetic induction are increased to suppress the eddy currents. Excitation coils are connected parallel to each other to reduce the coil inductance for increasing the magnetic forces to attract the movable body and the response thereof.
REFERENCES:
patent: 2448727 (1948-09-01), Oetzel
patent: 3013189 (1961-12-01), Bernier
patent: 3553618 (1971-01-01), Lang
patent: 4067541 (1978-01-01), Hunter
patent: 4438419 (1984-03-01), Helinski
Kajima Takashi
Nogata Osamu
Ozaki Toshiharu
Harris George
Techonological Research Association
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