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US 5,490,583 AGranted
Magnetically-operable brake device
AssigneeTI Matrix Engineering Limited
InventorsPeter Anderson, Stuart J. Inglis
Life of this patent
Estimating the term…
Abstract
A brake device comprises a stack of friction plates (6,7) compressible to have a braking effect between an armature (9) and a magnet structure (10,) the structure including a permanent magnet (11) urging the armature towards the magnet structure to effect braking, and an electromagnet (12) energizable to augment the effect of the permanent magnet, or to oppose it either partially or completely so as to release the braking effect.
Claims1
The A method of operating a magnetically operable braking device comprising the steps of:
- providing a permanent magnet to cause said braking device to apply a braking force,
- energizing an electromagnet to oppose said action of said permanent magnet,
- further energizing said electromagnet so as to cancel said action of said permanent magnet, and
- increasing the energization of said electromagnet beyond the point at which it cancels said action of said permanent magnet to cause said braking device to apply a braking force.
1 more element
Dependencies are inferred from the claim text.