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:
Dec. 11, 1984
Filed:
Sep. 30, 1982
Donald J MaCleod, Aptos, CA (US);
Applied Motion Products, Inc., Scotts Valley, CA (US);
Abstract
A tachometer assembly is provided for use with electrical rotary magnetic motors. The assembly includes a conventional brushless DC motor (12) having a radially polarized main field ring magnet (24) forming the rotor (16) about a stator (18). The tachometer portion includes a commutator ring magnet (26) formed on one edge of the main field magnet (24) and an axially displaced circuit board (14) including one or more unbranched conducting traces (40). The commutator ring (26) includes a plurality of alternately axially polarized segments (27) which induce sinusoidal signals in the conductive traces (40) as the rotor (16) is rotated with respect to the circuit board (14). The tachometer assembly is utilized to generate rotational velocity and analog positional data for manipulation and control of the motor (12). The primary uses are in servo control mechanisms in the data processing and computer peripheral industries.