Electricity: motive power systems – Plural diverse motor controls – Running-speed control
Patent
1992-07-15
1994-03-29
Ro, Bentsu
Electricity: motive power systems
Plural diverse motor controls
Running-speed control
318254, 318565, H02P 500
Patent
active
052988406
ABSTRACT:
A motor control circuit which controls the speed of a motor so as to settle at a predetermined reference rotational speed based upon a detection signal dependent upon the rotating speed of the motor, and outputs to external devices a ready signal representing that the rotating speed of the motor has stabilized within a predetermined allowable range with respect to the reference rotational speed, includes a window pulse generating circuit which generates a window pulse having a width dependent upon a range of the generating period of the detection pulse generated in correspondence with the rotating speed within the allowable range; and a detection circuit which compares the window pulse and a detection pulse generated from the detection signal, detects either the window pulse or the detection pulse when the period of the detection pulse falls within a range of the period represented by the window of the window pulse and outputs the ready signal when the detection continues consecutively a plurality of times.
REFERENCES:
patent: 4371819 (1983-02-01), Kaufmann
patent: 4511834 (1985-04-01), Studtmann
patent: 4680516 (1987-07-01), Guzik et al.
patent: 4780773 (1988-10-01), Hama
Fujii Norio
Yoshino Motoyasu
Ro Bentsu
Rohm & Co., Ltd.
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