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Conductive Film, Paint for Downhole Tool Wiring

IP.com Disclosure Number: IPCOM000242755D
Publication Date: 2015-Aug-11
Document File: 2 page(s) / 38K

Publishing Venue

The IP.com Prior Art Database

Abstract

This invention describes a method of securing an electrical conductor along a shaft while maintaining the structural integrity of the shaft.

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Purpose of Invention

The purpose of this invention is to provide a method of securing an electrical conductor along a driveshaft while maintaining a circular cross-section without a wireway groove.

The Transmission of electrical power and signals between one or more components is often accomplished by running one or more insulated conductors along the axis of a shaft. These conductors are typically recessed into a groove which is cut into the shaft as shown in Figure 1. The recessed conductors also allow the driveshaft to maintain its uniform cross-section which would be required for bearing and bushing surfaces.

As a consequence, machining a groove into a shaft reduces the torque carrying capacity of the shaft. The groove also introduces stress concentrations which may reduce the fatigue life of the shaft.

This invention uses a conductive film or paint which is applied to a smooth (no groove) shaft. A film or conductive paint would have a much thinner cross-section than a circular wire with the same current carrying capacity. This would allow for a higher torque carrying capacity than a grooved shaft with the same outside and inside diameters. Applying the conductor to a smooth shaft allows it to maintain its structural integrity for transmitting torsional, axial and bending loads.

Description of Invention

In In this invention, a Conductor [3] would be sandwiched between an Inner Insulator [2] and Outer Insulator [4] and applied to a smooth Shaft [1] as shown in Figure 2 to form a conductor path along the Shaft. 

The Inner Insulator (2) is an electrical insulation material which may be painted onto the shaft or is an adhesive film or tape or a heat shrink sleeve. The insulation material must be at least as wide as the conductor (3). The purpose of the Inner Insulator is to electrically...