System for controlling the rotational speed of a rotary member

Details System for controlling the rotational speed of a rotary member System for controlling the rotational speed of a rotary member

1992-05-04

1993-07-06

Ro, Bentsu

Electricity: motive power systems

Plural diverse motor controls

Running-speed control

318464, 361239, 361240, 324163, H02P 500

Patent

active

052257495

ABSTRACT:
The present invention provides a system for controlling the rotational speed of a rotary member such as a video tape recorder drum or the like. The system detects a zero crossing interval in the output of a frequency generator, adding it to the subsequent zero crossing interval in the delayed output signal and using the result to control the motor or the like.

REFERENCES:
patent: 3355649 (1967-11-01), Boylan et al.
patent: 3409814 (1968-11-01), Azuma et al.
patent: 3596162 (1971-07-01), Takayama
patent: 3867647 (1975-02-01), Callahan et al.
patent: 4259625 (1981-03-01), Hatakeyama et al.
patent: 4321901 (1982-03-01), Kobayashi et al.
patent: 4928045 (1990-05-01), Doemen
patent: 5023924 (1991-06-01), Tajima et al.

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