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. 30, 2013
Filed:
Jun. 13, 2011
Gary Mackay, Ancaster, CA;
Roland Vander Straeten, Guelph, CA;
Gary Mackay, Ancaster, CA;
Roland Vander Straeten, Guelph, CA;
Wind Smart, Inc., Ancaster, Ontario, CA;
Abstract
A wind turbine has a rotor; a hydraulic pump coupled to the rotor, two or more variable displacement hydraulic motors which are driven by fluid flow from the hydraulic pump, at least one generator coupled to the variable displacement hydraulic motors and a closed loop hydraulic oil circuit for carrying pressurized oil from the hydraulic pump to the motors and to return oil to the pump from the motors. A controller in the closed loop hydraulic oil circuit controls the flow of oil in the closed loop circuit and displacement in each of the variable displacement hydraulic motors. Control of flow in and out of the motor for each revolution of that motor controls the flow to the hydraulic pump which has a fixed displacement, thereby controlling its rpm, thereby controlling the rotor rpm. A hydraulic accumulator can be provided in the closed loop.