Motor rotation speed control circuit

Details Motor rotation speed control circuit Motor rotation speed control circuit

1989-05-22

1991-10-15

Shoop, Jr., William M.

Electricity: motor control systems

Closed loop speed control system for dc motor with commutator

Armature control by digital or combined analog and digital...

388815, 388912, H02P 517

Patent

active

050581910

ABSTRACT:
A motor rotation speed control circuit fabricated in an LSI, a first counter which, after being reset by each rotation of the motor, begins counting clock pulses. Bit-outputs of the first counter are led out of the LSI package of the LSI, and are selectively connected to external input lead terminals of a plurality of gate circuits, each of which detects when the first counter has counted a number determined by sum of the input bit-outputs. One gate circuit detects a first reference count-number N.sub.a, which is smaller than a probable least count-number corresponding to, for example, a lower limit of tolerance of the motor speed, considering future possible changes of the motor speed. After being reset by a reset signal corresponding to the first refernece number N.sub.a input thereto, a second counter, preset with a second reference count-number N.sub.b, starts to count the clock pulses. The second reference count-number N.sub.b is chosen so that N.sub.a +N.sub.b =N.sub.0, N.sub.0 being a target count-number corresponding to a target cycle time of a single rotation. A carry signal of the second counter can be used in place of a lost signal representing the targe count-number N.sub.0 when the rotation of the motor is faster than the target speed. If the desired motor speed must by modified, the count-numbers can be easily modified by external connections of the terminals leading out of the LSI package. The second reference count-number of the second counters is fixed.

REFERENCES:
patent: 3950682 (1976-04-01), Dohanich
patent: 4254367 (1981-03-01), Sakamoto
patent: 4298832 (1981-11-01), Acker et al.
patent: 4617675 (1986-10-01), Ashikaga et al.
patent: 4631462 (1986-12-01), Geven
patent: 4668900 (1987-05-01), Tabuchi
patent: 4716535 (1987-12-01), Yoshida et al.

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