Motor speed control apparatus

Details Motor speed control apparatus Motor speed control apparatus

1988-04-08

1989-10-03

Shoop, Jr., William M.

Electricity: motor control systems

Open loop speed control system for dc motor with commutator

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

388915, 180142, H02P 706

Patent

active

048719528

ABSTRACT:
A motor speed control apparatus includes a ladder resistor circuit, a reference signal generator, and a comparator. The ladder resistor circuit selectively receives a voltage signal having a predetermined amplitude at a plurality of nodes. The ladder resistor circuit arranged to change an output voltage value thereof in accordance with a voltage application position. The level of the reference signal generator is periodically changed. The comparator compares a voltage value of the reference signal with an output voltage value of the ladder resistor circuit and outputs a pulse output having a variable pulse width on the basis of a comparison result. A motor speed is controlled on the basis of the pulse output.

REFERENCES:
patent: 3883786 (1975-05-01), McNaughton
patent: 4622500 (1986-11-01), Budelman, Jr.
patent: 4626994 (1986-12-01), Yabe et al.
patent: 4680516 (1987-07-01), Guzik et al.
patent: 4739237 (1988-04-01), Maruta
Japanese Laid-Open Utility Model Specification No. Sho 60-62370.

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