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:
Aug. 22, 2006
Filed:
Oct. 22, 2002
Young-kee Min, Elm Grove, WI (US);
Young-Kee Min, Elm Grove, WI (US);
YKM Technologies, LLC, Elm Grove, WI (US);
Abstract
A circuit and method measures the voltage at the main motor winding () and detects the points in the electromagnetic wave cycle at which this voltage 'crosses' zero. The method and circuit also measures the voltage at the auxiliary motor winding (). The voltages measured in the main winding () and in the auxiliary winding () are compared by the circuit () as a means for starting and restarting the auxiliary winding (). The circuit and method also detects the points in the electromagnetic wave cycle where the current in the auxiliary winding 'crosses' zero and compares the phase of these current zero crossing points with a window pulse () that is generated when the main voltage crosses zero. When the zero current crossing points fall within the window pulse, the auxiliary winding () is up to proper operating speed and the auxiliary winding () is disconnected by the starting circuit. If the load on the main motor winding () increases or the main motor winding () speed decreases below a certain predetermined speed, the auxiliary winding () is switched back into the circuit to boost the speed of the main motor winding ().