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:
Jun. 17, 2008
Filed:
Aug. 17, 2006
John J. Golownia, Hartford, WI (US);
Thomas E. Simon, Cedarburg, WI (US);
Peter H. Werner, Blaine, WA (US);
John J. Golownia, Hartford, WI (US);
Thomas E. Simon, Cedarburg, WI (US);
Peter H. Werner, Blaine, WA (US);
Rockwell Automation Technologies, Inc., Mayfield Heights, OH (US);
Abstract
A system and method for operating a motor drive unit. The motor drive unit is coupled to a motor driving a load and is configured to selectively control the motor according to a torque control mode and a speed control mode. The motor drive unit includes a circuit configured to generate an operational condition signal indicating an operational condition of the motor and a regulator configured to receive the operational condition signal and generate a motor control signal. The motor drive unit also includes a first controller configured to receive the motor control signal and a reference control signal and select either the motor control signal or the reference control signal to use as a control signal to drive the motor according to either torque control or speed control. The motor drive unit also includes a second controller configured to monitor the operational condition signal and, upon detecting a preliminary indication of a change in the load, bypass the first controller to drive the motor according to the other of torque control or speed control.