Inductive coil structure with electrical return path

Details Inductive coil structure with electrical return path Inductive coil structure with electrical return path

1988-08-04

1990-04-17

Kozma, Thomas J.

Inductor devices

Winding formed of plural coils

7386236, 336183, 336200, 336232, H01F 2728

Patent

active

049184180

ABSTRACT:
An apparatus is provided for use with non-contacting torque sensors. Many non-contacting torque sensors use bulky inductive coil structures to induce magnetic flux into the shaft whose torque is to be measured, and to sense a change in magnetic permeability of the shaft in response to torque applied thereto. These large, cumbersome structures are quite expensive to fabricate, and difficult to manufacture and install. As a solution, a flexible, ribbonlike inductive coil structure is provided. The dual layer construction of this coil structure enables it to provide adequate magnetic flux distribution, similar to that of much larger coil structures. Furthermore, the unique layout of the coils results in an efficient, accurate structure for inducing and sensing magnetic flux.

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