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Browse Prior Art Database

Disk Type Printed Circuit Armature

IP.com Disclosure Number: IPCOM000074947D
Original Publication Date: 1971-Jul-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 42K

Publishing Venue

IBM

Related People

Parker, JE: AUTHOR

Abstract

This disk armature is made by a method which simplifies the formation of the armature winding interconnect tabs and also provides a centrally located mounting disk, which is used to mount the armature on the shaft of an electric motor.

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Disk Type Printed Circuit Armature

This disk armature is made by a method which simplifies the formation of the armature winding interconnect tabs and also provides a centrally located mounting disk, which is used to mount the armature on the shaft of an electric motor.

A flat card 1 of nonconductive support substrate, such as fully cured glass reinforced epoxy, is coated on the bottom side with a sheet of conductive metal 2, such as copper, View A. This coating is formed by adhesive bonding, or by direct plating. As an alternative, card 1 may be formed of B-staged epoxy/glass laminate, and copper layer 2 may be bonded to the B-staged layer by heat reflowing and final curing of the resin. The top side of the substrate card is then cut or ground to form two concentric annular grooves 3 and 4 through the substrate to expose two annular surfaces of copper, View B. The top side of the substrate card is then plated to form a second sheet 5 of copper. The two concentric grooves now form two continuous annular bands 6 and 7 of electrical interconnection between the two sheets of metal, View C.

Each sheet of metal is now processed by printed circuit techniques to form the multiple conductors of an armature winding, one conductor 8 of which is shown in View D. The etching step of this process results in the mechanical release of the selvage material which is outboard the outer annular groove 3. The substrate disk 10 which is inboard of the inner groove 4 is mechanically h...