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:
Feb. 04, 1997
Filed:
Jul. 29, 1994
David M Carson, Newtown, CT (US);
John A Fleming, Newtown, CT (US);
Victor W Miranda, Jr, West Haven, CT (US);
Sorvall Products, L.P., Newtown, CT (US);
Abstract
A support substrate having an array of magnetically responsive sensors is mounted within the housing of a brushless DC motor in a plane perpendicular to the axis of the motor shaft having commutating magnets thereon. A ferromagnetic flux concentrating member in the form of a generally planar disc having an annular rim with radially inwardly directed spokes is mounted to the support substrate. Each spoke has a radial gap therein. A magnetically responsive sensor is received within each radial gap. The gap may divide the spoke into two discrete gap segments, or may alternatively form an enclosed recess with generally radially extending sidebars along each lateral edge of the spoke. The flux concentrating member conducts magnetic flux emanating from one magnetic pole to and through each of the magnetically responsive sensors and returns the flux to the other pole, such that, as the shaft is rotated, each of the magnetically responsive sensors is at substantially all times under the influence of magnetic flux emanating from one of the commutating magnets.