Capstan motor control circuit

Details Capstan motor control circuit Capstan motor control circuit

1986-07-31

1987-06-02

Shoop, Jr., William M.

Electricity: motive power systems

Plural diverse motor controls

Motor-reversing

318269, 318311, H02P 500

Patent

active

046706941

ABSTRACT:
A capstan motor control circuit comprises a comparing circuit for comparing an instruction voltage dependent on an instructed low-speed search mode and a rotational speed voltage dependent on a present rotational speed of a capstan motor, a circuit for detecting a rotating direction of the capstan motor and for generating a rotating direction instruction which instructs rotation in a direction opposite to a detected present rotating direction of the capstan motor, a circuit for generating a braking voltage, and a circuit responsive to an output of the comparing circuit for supplying to the capstan motor the rotating direction instruction and the braking voltage during a time period in which the rotational speed voltage is greater than the instruction voltage, and for supplying to the capstan motor the instruction voltage and a rotating direction instruction which instructs rotation in a direction identical to the present rotating direction of the capstan motor when the rotational speed voltage becomes approximately equal to the instruction voltage.

REFERENCES:
patent: 4258299 (1981-03-01), Takeda et al.
patent: 4259625 (1981-03-01), Hatakeyama et al.

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