The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 19, 1989
Filed:
Apr. 15, 1988
Francis McMullin, Ennis, IE;
Kollmorgen Corporation, Simsbury, CT (US);
Abstract
In a screened inductance sensor for a brushless d.c. motor, a sensor rotor carrying conductive screens is mounted on an extension of the motor shaft. A single solenoidal drive winding on a stator of the sensor establishes a drive field, when energized, which induces a voltage in a sense winding, also carried on the stator. This sense winding is laid around the periphery of a notional cylinder coaxial with the rotor and stator and has series-connected loops of generally rectangular configuration when viewed in development. The screens pass between the drive winding and the sense winding in operation of the sensor to modulate the sense winding output by shading the drive field. The single drive winding is located radially inwardly of one axial end of the sense winding, so that this axial end is aligned with an axially central region of the drive winding midway between its axial ends.