Speed control
US4224545A · kind A · utility
39Cited by
3References
12Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 2, 1978 |
| Grant date | Sep 23, 1980 |
| Priority date | — |
| Expiry date | Aug 2, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH02P29/0022
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A speed control arrangement for a rotatable member driven by an energy source, such as a spring, whose driving torque can vary consists of an eddy current brake comprising an eddy current rotor driven with the rotatable member and a magnetic circuit coupled to the rotor to exert a braking effect. The magnetic circuit is carried by an arm movable relative to the rotor by unwinding of the spring (or other change in torque) to alter the coupling, and the braking effect, as the torque exerted by the energy source varies.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.