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US 2006/0131977 A1Published application
Rotor for an electrical motor
AssigneeDanfoss Compressors GmbH
InventorsNiels Weihrauch, Peter Andersen
Life of this patent
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Abstract
The invention provides a rotor for an electrical motor. The rotor comprises both a squirrel cage and a number of magnets and can be inserted e.g. in a line-start motor. To secure the magnets in cavities in a core of the rotor, an end plate is attached to one axial end face by rivet means, and to simplify manufacturing of the rotor, the rivet means forms part of at least one of the short circuit rings of the squirrel cage.
Claims10
A rotor for an electrical motor, the rotor comprising:
- a core made of a magnetically conductive material,
- a squirrel cage comprising axially extending conductors and axially oppositely located short circuit rings moulded from an electrically conductive material,
- a magnet located in a cavity in the core, the cavity comprising an opening (11) in an axial end face of the rotor, the opening allowing insertion of the magnet into the cavity,
- an end plate which covers the end face and secures the magnet in the cavity, and
- rivet means for fastening the end plate to the core,
- wherein the rivet means forms part of a first one of the short circuit rings.
3 more elements
A method of attaching an end plate to an end face of a rotor, the rotor comprising:
- a core made of a magnetically conductive material,
- a squirrel cage comprising axially extending conductors and axially oppositely located short circuit rings,
- a magnet located in a cavity in the core, the cavity comprising an opening in an axial end face of the rotor, the opening forming a first edge and allowing insertion of the magnet into the cavity, the magnet being secured in the cavity by the end plate, and
- rivet means forming part of the squirrel cage,
- wherein the rivet means is deformed to cover a part of the end plate.
2 more elements
Dependencies are inferred from the claim text.