Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Including means for using – or compensating for – the induced...
Patent
1988-07-25
1989-07-25
Pellinen, A. D.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Including means for using, or compensating for, the induced...
361160, H01H 4700
Patent
active
048519596
ABSTRACT:
In a disk memory library, picker arms, operated by a solenoid, are used to remove a selected disk from a library stack of disks and to place the disk in a reading/writing environment. The solenoid plunger's position is determined by noting its effect on a series resonant circuit that is formed with the coil inductance of the solenoid coil and a series capacitor. A function generator provides a triangular signal to the solenoid coil. An amplifier and peak detector are coupled to the coil to amplify and peak detect the voltage signal across the coil. A threshold detector, coupled to the output of the peak detector, is set to provide a digital output indicating when the solenoid's plunger is in or out. The function generator also provides a square wave that is synchronized to the triangle wave and is coupled to sample the output from the threshold detector. The change in the coil's inductance causes a phase shift in the triangle wave which further accentuates the voltage difference appearing across the coil. The output from the synchronous detector is used to determine when the plunger is in or out and, in turn, when the picker arms are extended or retracted.
REFERENCES:
patent: 4387306 (1983-06-01), Sibley
patent: 4538203 (1985-08-01), Flanner
Dugas Edward
Eastman Kodak Company
Fuller Leon K.
Pellinen A. D.
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