Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1991-05-31
1993-11-30
Gaffin, Jeffrey A.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361144, 361147, H01F 1300
Patent
active
052671194
ABSTRACT:
Apparatus for demagnetizing and magnetizing a chuck, having circuitry for connection with a 3-phase 4-line AC source, and including a power circuit and a control circuit. The power circuit leads directly from the source to the chuck, without transformers and capacitors. The three phases of the AC are individually impressed on the chuck, at corresponding angles, and rectifiers rectify the current at each phase. The circuitry will accommodate a single chuck, or selective ones of multiple chucks (e.g., nine). The voltage provided by the source is of a predetermined value (e.g., 230 V) and voltage of a greater value (e.g., 290 V) can be applied for demagnetizing. Solid state controls are provided, the individual phases of the current, for controlling greater and lesser voltages, and for putting a single chuck, or selected ones of multiple chucks, in circuit.
REFERENCES:
patent: 3579053 (1971-05-01), Littwin
patent: 4306269 (1981-12-01), Bacchiere et al.
patent: 4370693 (1983-01-01), McDonald et al.
patent: 4402032 (1983-08-01), Wilterdink
patent: 4633361 (1986-12-01), Ela et al.
patent: 4771358 (1988-09-01), Millner
patent: 4843516 (1989-06-01), Armond et al.
Armond Joseph A.
Rodenas Juanito
Electro-Matic Products Co.
Gaffin Jeffrey A.
Gallagher Paul H.
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