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:
Aug. 15, 1978
Filed:
Jan. 24, 1977
Norman A Jacobs, Arlington Heights, IL (US);
Teletype Corporation, Skokie, IL (US);
Abstract
A drive control system for a stepping motor having an optical disk sensor on the rotor shaft. A binary counter counts output pulses from a clock running much faster than the maximum speed expected from the optical disk. Optically-generated pulses, synchronized with the counted pulses, transfer the count from the counter into a storage register and reset the counter. The count achieved by the counter is inversely proportional to the velocity of the rotor shaft. More pulses and a higher count means a lower shaft speed. Therefore, the contents of the register is a coded measure of shaft speed. A code converter is used to determine the power input to the stepping motor to maintain a desired shaft speed. Therefore, the higher the motor speed and the lower the counter output between successive optically generated pulses, the less power is delivered to the stepping motor coils.