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US 7,732,959 B2Granted
Rotational coupling device
AssigneeWarner Electric Technology LLC
InventorJames A. Pardee
Life of this patent
Estimating the term…
Abstract
A rotational coupling device for use as a clutch and/or brake is provided having improved magnetic efficiency and structural integrity. A permanent magnet is coupled to one of a brake plate and an armature and axially aligned with a portion of the other for improved braking performance.
Claims23
A rotational coupling device, comprising:
- a rotor coupled to an input shaft for rotation therewith, said input shaft disposed about a rotational axis;
- a field shell disposed about said input shaft and fixed against rotation;
- an electrical conductor disposed within said field shell on a first side of said rotor;
- a brake plate coupled to said field shell;
- an armature disposed axially between said rotor and said brake plate on a second side of said rotor opposite said conductor, said armature coupled to an output member;
- and,
- a first permanent magnet coupled to one of said brake plate and said armature and axially aligned with a first portion of the other of said brake plate and said armature
- wherein a surface of said first permanent magnet engages a surface of said other of said brake plate and said armature when said brake plate and said armature are in engagement.
5 more elements
A rotational coupling device, comprising:
- a rotor coupled to an input shaft for rotation therewith, said input shaft disposed about a rotational axis;
- a field shell disposed about said input shaft and fixed against rotation;
- an electrical conductor disposed within said field shell on a first side of said rotor;
- a brake plate coupled to said field shell;
- an armature disposed axially between said rotor and said brake plate on a second side of said rotor opposite said conductor, said armature coupled to an output member;
- and,
- a first permanent magnet coupled to one of said brake plate and said armature and axially aligned with a first portion of the other of said brake plate and said armature
- further comprising a bearing disposed about said input shaft and supporting said field shell wherein energization of said conductor causes magnetic flux to travel radially inwardly of said bearing along a first path from said rotor to said field shell.
5 more elements
A rotational coupling device, comprising:
- a rotor coupled to an input shaft for rotation therewith, said input shaft disposed about a rotational axis;
- a field shell disposed about said input shaft and fixed against rotation;
- an electrical conductor disposed within said field shell on a first side of said rotor;
- a brake plate coupled to said field shell;
- an armature disposed axially between said rotor and said brake plate on a second side of said rotor opposite said conductor, said armature coupled to an output member;
- and,
- a first permanent magnet coupled to one of said brake plate and said armature and axially aligned with a first portion of the other of said brake plate and said armature
- further comprising a second permanent magnet coupled to said one of said brake plate and said armature and axially aligned with a second portion of said other of said brake plate and said armature.
5 more elements
Dependencies are inferred from the claim text.