US 5,028,830 AGranted

Rotor apparatus for axial field electromagnetic devices

AssigneeAllied-Signal Inc.

InventorJoseph A. Mas

Life of this patent

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Abstract

An axial field flow-through rotor apparatus comprises a structure formed of magnetic strip wound around a hub in such a way that the first and last layers of strip have surfaces that form coaxial cylinders and edges that define the inner and outer perimeters of parallel washer-shaped faces. The distance between the washer-shaped faces corresponds to the width of the magnetic strip. A plurality of equally spaced radial slots are cut into one of these faces to a selected depth corresponding to a portion of the strip width. A spider that is formed of conductive material and has one spoke for each slot is then placed into the cut face. A plurality of equally spaced radial slots are then cut into the other face at locations that correspond to those at which slots were cut into the first face and to a depth that corresponds to the previously uncut strip width. Thereafter, a second spider, formed of a conductive material and having one spoke for each slot, is placed into said other face.

Claims9

Dependent claims

An axial field flow-through rotor apparatus comprising:

(a) a strip of magnetic material wound about a hub to define a cored cylindrical structure having a first and second circular faces formed by the edges of the strip, with the distance between the first and second faces in a direction parallel to the axis of said cylindrical structure equal to the strip width;
(b) a plurality of radially uniformly spaced slots having been cut into said first and second circular faces and into said hub whereby said slots extend entirely through the cylindrical structure between said first and second circular faces and entirely through said hub;
and
(c) spider means having an inner hub, an outer circular member and a plurality of radial spokes corresponding to said plurality of slots and disposed within said cylindrical structure and thereabout by engagement within said slots, said spider means being coextensive with said slots, the diameter of said outer circular member being such as to fit over said cylindrical structure in contact therewith, said spokes being sized to fit in said slots in contact with the walls thereof, said spider means being formed of conductive material and said spider means coacting with said cylindrical structure to define a squirrel cage configuration.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 07/622,205Filed 30 Nov 1990 · continuation
Priority: 16 Mar 1984
Granted: 2 Jul 1991
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

H02K 17/16
Asynchronous induction motors: having rotors with internally short-circuited windings, e.g. cage rotors
H01F 2007/1676
Rectilinearly-movable armatures: means for avoiding or reducing eddy currents in the magnetic circuit, e.g. radial slots
Y10T 29/49012
Dynamoelectric machine: rotor
Y10T 29/49073
Electromagnet, transformer or inductor: by assembling coil and core

Family

Serial589,852Parent of this division · filed 16 Mar 1984
Serial804,417Parent of this continuation · filed 4 Dec 1985
Serial120,225Parent of this continuation · filed 12 Nov 1987
Serial384,891Parent of this continuation · filed 24 Jul 1989
US 5,028,830 AThis patent

From the US filing history. Foreign family members aren’t listed.