Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1980-05-23
1982-12-28
Rubinson, G. Z.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361208, 123329, F16K 3106
Patent
active
043665241
ABSTRACT:
A device for controlling an electromechanical transducer such as a proportional electromagnetic valve, in which a pulse signal having a constant period shorter sufficiently than the minimum response time required for the displacement of the plunger of the proportional electromagnetic valve over its predetermined full stroke is applied to the electromagnetic coil of the proportional electromagnetic valve to superpose a very small vibratory stroke component on the stroke of the plunger, and the duty cycle of the pulse signal applied to the electromagnetic coil is varied so as to urge the plunger in directly proportional relation to the variation of the duty cycle without substantially giving rise to mechanical hysteresis in the stroke of the plunger.
REFERENCES:
patent: 3659631 (1972-05-01), Rakoske
patent: 3725747 (1973-04-01), Cowan
patent: 3745420 (1973-07-01), Hafner
patent: 3870931 (1975-03-01), Myers
"Pulse-Width Modulation of Magnets," T. L. Wells, IBM Technical Disclosure Bulletin, vol. 21, No. 3, Aug. 1978.
Kuroiwa Hiroshi
Sasayama Takao
Hitachi , Ltd.
Rubinson G. Z.
Schroeder L. C.
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