Protection circuit for d.c. motors
US4430682A · kind A · utility
15Cited by
2References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 30, 1981 |
| Grant date | Feb 7, 1984 |
| Priority date | — |
| Expiry date | Oct 30, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02H7/0833
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A d.c. motor, particularly a paper-feed drive motor for printers, is monitored and controlled (e.g., for protection against paper jamming) by controlling a motor switch to turn the motor off temporarily when excess current is monitored, but turning it on to probe persistence of the condition. This turn-on will remain short if, indeed, overload current conditions are still present. The circuit includes a bistable multivibrator with input circuit rendering it monostable for normal operating conditions and astable for the overload case.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.