Permanent magnet elevator disk brake
US8151950B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 17, 2006 |
| Grant date | Apr 10, 2012 |
| Priority date | — |
| Expiry date | Jun 9, 2028 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2129/065
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A brake assembly (18) includes a permanent magnet (36) that generates a first magnetic field (52) in a direction that causes application of a clamping force on a brake disk (22). An electromagnet (38) is energized with current of a proper polarity to generate a second magnetic field (54) opposite the first magnetic field (52). The rate and magnitude at which current is applied produces a controlled repulsive force between the two magnetic fields (52, 54) to disengage the brake disk (22). As a distance between the permanent magnet (36) and the electromagnet (38) increases, the difference in field strength decreases until an equilibrium position is obtained. The brake is applied and released in a controlled manner by varying the strength of the second magnetic field (54) relative to the first magnetic field generated by the permanent magnet (36).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.