Patent ID: 6380655
Filing Date: 2002-04-30
Classification: H02K

Abstract:
A variable-speed electromechanical energy converter comprising:a wound-type induction machine comprising a wound stator provided with a primary winding, a wound rotor provided with a secondary winding and disposed inside of the wound stator, and a rotor shaft fixed to the wound rotor; a power rectifier connected to the secondary winding to convert ac power produced in the secondary winding of the wound rotor into dc power; a chopper connected to a dc output side of the power converter to control a dc output of the power rectifier according to a control signal; and a capacitor connected through a rectifying device to the chopper in parallel connection; and a power inverter comprising a switching device for converting dc power stored in the capacitor into ac power to feed back the ac power to an ac system connected to the primary winding; wherein a cage rotor provided with conductive members is disposed between the wound rotor and the rotor shaft; said cage rotor being separated from said rotor shaft by an inner gap and separated from said wound rotor by a middle gap so as to rotate independently of said rotor shaft.