Simultaneous independent control system for electric motors
US4341982A · kind A · utility
61Cited by
4References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 3, 1980 |
| Grant date | Jul 27, 1982 |
| Priority date | — |
| Expiry date | Jul 3, 2000 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63H19/24
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A system for simultaneously and independently controlling a plurality of electric motors from a number of dispersed stations. The system operates by transmission of duty cycle modulated selected frequencies superimposed on a DC track voltage on a common power line servicing the motors. The modulation is variable and determines the speed of the motors. Transmitters are portable and designed removably to plug into a common signal transmission cable anywhere along its length without interaction. Receivers, each tuned to a specific frequency and associated with and controlling a motor, are coupled to the common power line.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.