Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1978-11-02
1980-07-15
Wolff, John H.
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 90, 360137, G11B 1546, G11B 1902
Patent
active
042131618
ABSTRACT:
An improved control is provided for the tape transport motor of a battery-powered, slow-speed tape recorder typically used for producing magnetic recordings of an ambulatory patient. The recorder's tape transport means is driven by a synchronous AC motor powered from a DC (battery) supply. That DC supply, during normal operation, is voltage regulated to provide desired speed stability. That DC supply is inverted into a square wave DC current in a manner effectively providing a regulated square wave AC at twice the regulated DC voltage. Phase-shifting means connected to the inverter provide a phase-shifted square wave source necessary for the two-phase AC synchronous motor. In an improved mode of control, means are additionally provided for selectively supplying current at full battery voltage, square wave inverted and phase-shifted to the AC synchronous motor in lieu of the regulated supply voltage to provide high torque operation for selected periods of time as during "start-up" or "warm-up".
REFERENCES:
patent: Re29921 (1979-02-01), Cherry et al.
patent: 3347997 (1967-10-01), Woodruff
patent: 3742320 (1973-06-01), Ban
patent: 3913869 (1975-10-01), Richards
patent: 3982277 (1976-09-01), Naylor
Banks David
Dokus Edwin A.
American Optical Corporation
Duggan Jeremiah J.
Schneeberger Stephen A.
Spencer Alan H.
Wolff John H.
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