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. 24, 2002
Filed:
Aug. 31, 2000
Paolo Menegoli, San Jose, CA (US);
Ender Tunc Eroglu, San Jose, CA (US);
Whitney Hui Li, San Jose, CA (US);
STMicroelectronics, Inc., Carrollton, TX (US);
Abstract
A method and device are disclosed for controlling a polyphase motor having a plurality of windings. The device includes a memory device having stored therein data representing a predetermined driving profile, and driver circuit for driving the windings of the polyphase motor based upon the data provided by the memory unit. A feedback control loop is included having an input connected to a selected winding of the polyphase motor and providing an address signal to the memory device that is based upon a current level of the selected winding at around the time the back electromotive force (bemf) signal corresponding thereto crosses a zero reference, for controlling current provided to the windings by the driver circuit so that, for each winding, the current provided thereto is substantially in phase with a back electromotive force (emf) signal corresponding to the winding.