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:
Jan. 17, 1984
Filed:
Apr. 10, 1981
Noble G Larson, Arlington, MA (US);
John A Purbrick, Arlington, MA (US);
Matthew T Mason, Belmont, MA (US);
Massachusetts Institute of Technology, Cambridge, MA (US);
Abstract
A stepping motor control system which uses a closed-loop lead angle control technique wherein a programmably selected lead angle signal is combined with a signal representing the position of a step motor shaft so as to provide a coil state excitation signal for the coils of the stepping motor, the shaft thereof being rotated in response to the coil state excitation signal. The lead angle signal can be modulated in accordance with a selected duty cycle so as to assume two adjacent lead angle values during each modulation cycle. The system can also be arranged to permit the use of open-loop control using a suitably programmed externally supplied coil state excitation signal, the latter being capable of similar modulation as described above with reference to lead angle modulation.