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. 08, 1981
Filed:
May. 12, 1980
Bruce E Arnold, Clinton, NJ (US);
The Singer Company, Stamford, CT (US);
Abstract
A velocity servo for a motor wherein a high speed tachometer is replaced by an arrangement which mathematically converts the input voltage and current to the motor into a speed signal, utilizing known formulas and constants. To maintain accuracy of the servo when the constants change value with the temperature, an inexpensive low speed tachometer is utilized to derive a signal indicative of the actual speed of the motor and this speed signal is compared with the mathematically computed speed signal. In the event that there is a difference, the constants are modified in accordance with such difference. This can be implemented either by electrically alterable circuit values or through computer or microprocessor techniques.