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. 02, 1988
Filed:
Jun. 15, 1987
Rodger T Lovrenich, Santa Teresa, NM (US);
Other;
Abstract
A torque-angle stabilized servo motor drive which includes a constant current source and drive electronics responsive to step-control input signals for selectively applying current from the constant current source to the windings of a stepper motor. An encoder is coupled to the motor output shaft and provides a signal indicative of angular position of the rotor and shaft. Torque angle between the rotor and the magnetic field of the motor stator is determined as a function of a difference between the position-indicating encoder output and the control signals to the motor drive electronics, and such control signals are modified as a function of torque angle to obtain desired motion at the motor output shaft.