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:
Apr. 04, 1989
Filed:
Oct. 22, 1986
Jerome Sears, Wyckoff, NJ (US);
Walter Parfomak, Wallington, NJ (US);
Walter Kluss, Clifton, NJ (US);
Allied-Signal Inc., Morris Township, Morris County, NJ (US);
Abstract
The present invention deals with an apparatus and method for starting and running permanent magnet motors based on angular position information using an optical commutation technique. The optical commutation technique provides rotor position information at rest and while rotating for two-phase driving of a motor having a permanent magnet rotor. The angular position information is extracted by optical detectors, consisting of a light source and an optical sensor for detecting an optical pattern formed on the gyro rotor. The optical pick off associated with one phase is used to commutate the other phase. The optically detected signal output is converted to a frequency signal which is proportional to wheel speed. The frequency signal is converted to a voltage signal which is compared to a speed command signal in a feedback loop to generate the required drive. Alternately the frequency can be inputted to a phase lock loop circuit and compared with a speed reference clock frequency to generate the required drive signal level.