Electromagnetic clutch with permanent magnet brake
US5119918A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 11, 1991 |
| Grant date | Jun 9, 1992 |
| Priority date | — |
| Expiry date | Oct 11, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2129/065
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
Energization of an electric coil produces flux for attracting an armature of a clutch into engagement with a rotor in order to couple an input shaft to an output pulley. When the coil is de-energized, two angularly spaced permanent magnets pull the armature away from the rotor and into engagement with fixed pole pieces which cause a braking torque to be applied to the output pulley. The magnets are located closely adjacent one another and only along a short arc of the armature in order to enable the flux of the coil to overcome the flux of the magnets and effect easy release of the brake and engagement of the clutch when the coil is energized.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.