Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – Work or object holding type
Patent
1976-09-03
1978-07-25
Broome, Harold
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
Work or object holding type
335294, H01F 720
Patent
active
041032667
ABSTRACT:
A cooled magnet is disclosed for lifting magnetic materials with incident savings in the cost of energy. The magnet comprises a dome-shaped metal case open to the atmosphere under the case, and, for producing a magnetic field, a continuous hollow conductor electrical winding removably disposed on a central core within the metal case. The metal case and central core are each provided with a radial slot in a vertical plane to inhibit the build-up of eddy currents. The hollow conductor offers an electrically continuous path, but is preferably so constructed as to provide a fluid discontinuous path for a cooling medium circulated within the hollow conductor.
The dome-shaped metal case includes an inverted dished housing and a reinforcing cap member. The dished housing and cap member are fabricated from plural arcuate steel shells of predetermined configuration, superposed and nested one upon another in unimpeded magnetic communication with the central core. A metal case so fabricated permits surprising efficiency in design for maximum lifting capacity and avoids conventional casting and machining of the case.
The electrical winding is wound in plural cylindrical helical coils, one overlying the other radially outwardly, on a hollow cylindrical mandrel which is removably disposed on the central core. The space occupied by the winding and central core is less than 25 percent of the space within the dome-shaped metal case. The remaining 75 percent or more of the space, allows scrap fragments to be held within the metal case thus increasing the total lifting capacity of the magnet.
REFERENCES:
patent: 2479248 (1949-08-01), Moore et al.
patent: 2511693 (1950-06-01), Burghoff
patent: 3054026 (1962-09-01), Lovell
patent: 3693126 (1972-09-01), Rybak
patent: 3891953 (1975-06-01), Thomin
Broome Harold
Lobo Alfred D.
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