초록 ▼

In order to assure efficient cooling and a temperature balance between the stator and the rotor, an asynchronous electric motor is provided containing a closed cooling liquid circuit which passes successively into the stator (1) and into the shaft (3) of the rotor, over the entire length of the stat

In order to assure efficient cooling and a temperature balance between the stator and the rotor, an asynchronous electric motor is provided containing a closed cooling liquid circuit which passes successively into the stator (1) and into the shaft (3) of the rotor, over the entire length of the stator and the rotor. A pump (15) is incorporated in the rotor shaft. The liquid is injected into the pump by a stationary axial tube (16) and comes out again between the shaft and this tube. The pump includes a centrifugal pumping member (20) fixed to the bottom of the bore of the shaft, and longitudinal-blades (21) fixed to the shaft facing an external helicoid rib (17) of the injection tube. The liquid is cooled by the ambient air along the periphery of the stator.

대표청구항 ▼

[ What is claimed is:] [1.] An asynchronous electric machine comprising:a stator having a support structure, first conduit means and a peripheral casing;a rotor mounted within said stator and having a hollow shaft;a closed cooling circuit passing through said first conduit means and within said holl

[ What is claimed is:] [1.] An asynchronous electric machine comprising:a stator having a support structure, first conduit means and a peripheral casing;a rotor mounted within said stator and having a hollow shaft;a closed cooling circuit passing through said first conduit means and within said hollow shaft, substantially over the entire length of the rotor and the entire length of the stator; and,a pump for circulating a liquid in said cooling circuit, said pump being arranged inside the rotor in said hollow shaft;wherein said cooling circuit is a closed circuit within the electric motor and includes a radiator comprising a cooling chamber arranged in the stator between said supporting structure and said peripheral casing and where said liquid in contact with said peripheral casing, which is arranged to be cooled by ambient air.