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:
Apr. 06, 2010
Filed:
Nov. 16, 2007
Robert G. Brown, New Hartford, CT (US);
Robert G. Brown, New Hartford, CT (US);
The Bergquist Torrington Company, Chanhassen, MN (US);
Abstract
A controller is provided for operating a DC motor through a commutation circuit and for synchronizing the commutation circuit to motor position and speed by measuring back EMF voltages along commutation cycle steps during which the measured phase is not being driven. In connection with each such step, the back EMF voltage is measured at two points offset from the center of the step. The controller uses the measured voltages and their corresponding locations to locate the center point of the step through extrapolation. The motor can be analyzed for determining suitable locations for the measuring points.