Motor control circuit for tape drive unit

Details Motor control circuit for tape drive unit Motor control circuit for tape drive unit

1977-04-04

1979-05-22

Eddleman, Alfred H.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

242203, 318 7, 318 59, 318317, 360 73, 360 743, G11B 1532, G11B 1544, G11B 1928

Patent

active

041562577

ABSTRACT:
A tape drive for moving a tape with a prerecorded clock track past a transducer at a constant velocity. An output signal from a speed servo circuit controls the energization, and hence the speed, of a tape driving motor. It responds to a tape speed signal derived in part from a power supply voltage and a speed reference signal derived from the power supply voltage. Voltage variations and temperature-induced variations in the power supply have a minimal effect on tape velocity. Tension servo circuits control the power to a driven motor in response to the speed reference signal and the speed servo output signal thereby to maintain the tape under tension. A brake and park gating circuit slows the tape and maintains the tape under tension when it stops. The speed reference signal undergoes an exponential rise during starting operations to minimize acceleration.

REFERENCES:
patent: 3764087 (1973-10-01), Paananen et al.
patent: 3781490 (1973-12-01), Phillips
patent: 3809335 (1974-05-01), Mantey
patent: 3821803 (1974-06-01), Sakamoto
patent: 3910527 (1975-10-01), Buhler et al.
patent: 3913137 (1975-10-01), Sargunar
patent: 3982160 (1976-09-01), Goldschmidt et al.
patent: 3984868 (1976-10-01), Ragle et al.
MFE Corporation, Schematic 250 C-Drive, Drawing No. 00279000, 10/18/73.

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