Electronic cooling water pump with floating impeller

Abstract

An electronic cooling water pump with a floating impeller for a motor vehicle. The mechanism includes a support or housing, a stator, a water pump cover, a socket injection molding, a controller (or circuit board), and a rear cover. A rotor impeller injection molding is positioned at the center of the stator and floats when the water pump is operating. The magnetic field generated by the stator and the magnetic field generated by the permanent magnets in the rotor impeller injection molding turn the motor impeller injection molding at a certain rotation speed, so that the impeller does work on coolant, and also make the rotor impeller injection molding float automatically in the center of the stator. Bearings are eliminated and friction losses and pump noise are minimized.

What is claimed is: 
     
         1 . A floating impeller structure for a motor vehicle cooling water pump, comprising a stator member , an electric machine shaft member, a rotor impeller injection molding, and a plurality of permanent magnets wherein said rotor impeller molding has an open central core for positioning of said shaft member; and
 wherein the magnetic effect of the permanent magnets in said motor impeller injection molding positions said permanent magnets centrally in the member.   
     
     
         2 . The floating impeller structure for a motor vehicle cooling water pump as claimed in  claim 1 , wherein said rotor impeller injection molding comprises a water pump impeller and an electric machine rotor, said electric machine rotor comprising said plurality of permanent magnets, a permanent magnet support, and a permanent magnet protective cover. 
     
     
         3 . The floating impeller structure for a motor vehicle cooling water pump as claimed in  claim 2  wherein said permanent support is positioned centrally both radially and longitudinally in said stator member. 
     
     
         4 . The floating impeller structure for a motor vehicle cooling water pump as claimed in  claim 2  wherein said water pump impeller comprises a plurality of blade members. 
     
     
         5 . The floating impeller structure for a motor vehicle cooling water pump as claimed in  claim 1  wherein said water pump impeller and electric machine rotor comprise a single member. 
     
     
         6 . The floating impeller structure for a motor vehicle cooling water pump as claimed in  claim 5  wherein said rotor is injection insert molded into said impeller injection molding. 
     
     
         7 . The floating impeller structure for a motor vehicle cooling pump as claimed in  claim 1 , wherein said electric machine shaft member is fixed at the center of the stator, wherein said shaft core coincides with that of said rotor.