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. 29, 2006
Filed:
Feb. 27, 2004
Frank Eugene Wills, York, PA (US);
Harold Robert Schnetzka, York, PA (US);
Douglas Alan Kester, York, PA (US);
John F. Judge, Stewartstown, PA (US);
Mahesh Valiya-naduvath, Lutherville, MD (US);
Israel Federman, York, PA (US);
Frank Eugene Wills, York, PA (US);
Harold Robert Schnetzka, York, PA (US);
Douglas Alan Kester, York, PA (US);
John F. Judge, Stewartstown, PA (US);
Mahesh Valiya-Naduvath, Lutherville, MD (US);
Israel Federman, York, PA (US);
York International Corporation, York, PA (US);
Abstract
A system and method are provided for variable speed operation of a screw compressor to obtain increased capacity and efficiency. The screw compressor is connected to an induction motor driven by a variable speed drive, wherein the screw compressor has a variable output capacity that is dependent on the output speed of the motor. To obtain increased capacity and efficiency, the screw compressor is operated at a speed greater than the screw compressor's rated speed and does not include a slide valve. The maximum operating speed of the screw compressor, which speed is greater than the rated speed, is related to the maximum operating speed of the motor when operated at a voltage and frequency provided by the variable speed drive that is greater than the motor's rated voltage and frequency in a constant flux or constant volts/Hz mode.