Browse Prior Art Database

Electric Motor Armature

IP.com Disclosure Number: IPCOM000096791D
Original Publication Date: 1963-Nov-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 43K

Publishing Venue

IBM

Related People

Fisher, GA: AUTHOR

Abstract

A high strength, non magnetic armature for a high torque, low inertia electric motor is made on rigid cylindrical mandrel 10. To enable the completed armature to be removed from mandrel 10, layer 12 of tetrafluroethylene tape, e.g., TEFLON*, is close wound on mandrel 10.

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Electric Motor Armature

A high strength, non magnetic armature for a high torque, low inertia electric motor is made on rigid cylindrical mandrel 10. To enable the completed armature to be removed from mandrel 10, layer 12 of tetrafluroethylene tape, e.g., TEFLON*, is close wound on mandrel 10.

The inner surface of the armature is made up of layer 14 of glass fiber impregnated with epoxy resin which does not stick to tape 12. Layer 14 is made by close winding monofiliment glass fiber over layer 12. Greater torsional strength is obtained by winding the monofiliment at approximately 45 degrees to the longitudinal axis of mandrel 10 in two layers. A better structure is had with a woven sleeve of glass fiber with the strands oriented at 45 degrees of the mandrel axis. After the epoxy is cured, the layer is turned or ground smooth for better reception of

Layers 21 and 22 of conductors are next emplaced. For example, a sheet of copper backed by epoxy tissue 23 is etched to form a conductor pattern. The sheet is first folded to form layers of double conductor thickness. It is then wrapped around the glass fiber on the mandrel. The ends of the conductors are welded as necessary to form the armature winding arrangement. The folding step is eliminated in an alternative structure. Here a plurality of separate conductor etched layers are wrapped around the mandrel and welded in place to form the winding arrangement. Additional layers of glass fiber insulation can be interpos...