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. 14, 2009
Filed:
Oct. 22, 2003
Bruce Bushey, Minneapolis, MN (US);
Terry Schwartz, Shoreview, MN (US);
Richard Milun, Corcoran, MN (US);
Robert Erko, Apple Valley, MN (US);
John Haeg, Minneapolis, MN (US);
Bruce Bushey, Minneapolis, MN (US);
Terry Schwartz, Shoreview, MN (US);
Richard Milun, Corcoran, MN (US);
Robert Erko, Apple Valley, MN (US);
John Haeg, Minneapolis, MN (US);
Tennant Company, Minneapolis, MN (US);
Abstract
A control system for a linear actuator having an electric motor drawing a variable current level during operation. The control system includes a current level sensor for determining an operational current level of the linear actuator and a controller for generating a drive signal and a force request signal representative of a desired current level of the linear actuator. The drive signal remains constant during a predetermined time interval of the controller. The control system further includes a current limiting component for receiving the force request signal, the current level of the linear actuator and the drive signal. The current limiting component minimizes the current level of the electric motor in response to a comparison between the force request signal and the desired current level within a time interval substantially smaller than the predetermined time interval of the controller.