DC Motor control circuit for drop-out of stopping pulses in reco

Details DC Motor control circuit for drop-out of stopping pulses in reco DC Motor control circuit for drop-out of stopping pulses in reco

1982-09-24

1984-12-04

Truhe, J. V.

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318306, 318327, 318763, 358314, H02P 310

Patent

active

044866925

ABSTRACT:
A control circuit for a DC capstan motor used for driving a tape having control signals thereon is adapted for accurate stopping of the tape during intermittent-motion operation. A frequency generator coupled to the motor generates a frequency signal whose frequency is proportional to the motor's speed. A position signal generating circuit generates a position value that increments by steps upon occurrences of the frequency signal. A clamp circuit clamps the position value to a clamping level upon detection of the control signals. A brake start signal generator provides a brake start pulse signal when the position value exceeds a predetermined threshold, and this brake start pulse signal is used to commence braking of the motor. In order to permit accurate stopping in both forward and reverse directions, the clamping circuit provides one clamping level when a forward mode is selected and another clamping level when a reverse mode is selected.

REFERENCES:
patent: 3958271 (1976-05-01), Sumiyoshi
patent: 4086520 (1978-04-01), Hashizaki et al.
patent: 4212039 (1980-07-01), Koda
patent: 4254367 (1981-03-01), Sakamoto
patent: 4276571 (1981-06-01), Sakamoto
patent: 4303953 (1981-12-01), Sanderson

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