DC motor speed control system
US5388176A · kind A · utility
75Cited by
16References
50Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 6, 1992 |
| Grant date | Feb 7, 1995 |
| Priority date | — |
| Expiry date | Apr 6, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S388/93
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A speed controller for a DC motor minimizes speed droop and load droop through pulse width or frequency modulation. The controller provides an extra power increase upon engine starting or whenever a heavier load is temporarily encountered. The control circuit also has a current limiter, overload indicators, and a battery recharger. The controller is very inexpensive, primarily because all of the timing components are contained on a single integrated circuit timer chip such as a 556 timer. The controller contains other features, including a circuit for limiting the pulse width of the control signal from the pulse width modulator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.