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:
Oct. 02, 1984
Filed:
Jul. 12, 1982
Royal R Hawkins, Bloomington, MN (US);
Sundstrand Corporation, Rockford, IL (US);
Abstract
A proportional plus integral servo-reversible speed control for use in a system driving a load in either a forward or reverse direction of travel at a desired output speed. The servo-reversible speed control includes a control handle for providing a command voltage having a magnitude proportional to the desired output speed for travel in the reverse direction and having a magnitude inversely proportional to the desired output speed for travel in the forward direction. A pulse pickup device and frequency to voltage converter provide a voltage proportional to the actual output speed, the actual speed voltage being applied to both an inverting and noninverting amplifier. The actual speed voltage is applied as feedback to a proportional plus integral circuit from the noninverting amplifier for sensed travel in the reverse direction or from the inverting amplifier for sensed travel in the forward direction to provide a closed loop speed control for travel in one direction, down through zero speed and up in the opposite direction. The proportional plus integral circuit is responsive to the command voltage and the actual speed voltage gated thereto to generate a speed control signal which maintains the output speed of the system constant.