Air impeller and a housing for such an impeller

Abstract

An air impeller, comprising a frame, a bladed wheel ( 4 ) provided with blades ( 42 ) for producing a substantially axial flow of a gaseous medium, an alternating-current motor ( 5 ) for rotating the bladed wheel, said alternating-current motor comprising a fixed stator ( 52 - 54 ) and a ro-tating rotor, and a frequency converter ( 6 ) or inverter for controlling the alternating-current motor, and in which the rotor of the alternating-current motor is integrated with the bladed wheel ( 4 ), being placed on its outer rim, and the stator is placed in the frame of the air impeller outside the rotor so that the stator produces rotation of both the rotor and the bladed wheel. The frequency converter ( 6 ) or inverter is integrated with the stator or a part of it to form a unitary, frequency-converter or inverter-controlled air im-peller structure.

1 . Air impeller, comprising a frame, a bladed wheel ( 4 ) provided with blades ( 42 ) for producing a substantially axial flow of a gaseous medium, an alternating-current motor ( 5 ) for rotating the bladed wheel, said alternating-current motor comprising a fixed stator ( 52 - 54 ) and a rotating rotor, and a frequency converter ( 6 ) or inverter for controlling the alternating-current motor, and  
       in which the rotor of the alternating-current motor is integrated with the bladed wheel ( 4 ), being placed on its outer rim, and the stator is placed in the frame of the air impeller outside the rotor so that the stator produces rotation of both the rotor and the bladed wheel,  
       characterized in that the frequency converter ( 6 ) or inverter is integrated with the stator or a part of it to form a unitary, frequency-converter or inverter-controlled air impeller structure.  
     
     
         2 . Air impeller as defined in  claim 1 , characterized in that the frequency converter ( 6 ) or inverter is disposed in substantially the same plane perpendicular to the axial direction (A) with the stator or stator part, e.g. below the stator or stator part.  
     
     
         3 . Air impeller as defined in  claim 1 , characterized in that the stator is divided into four segments, which are arranged symmetrically outside the rotor.  
     
     
         4 . Air impeller as defined in  claim 3 , characterized in that the frame ( 52 ) of the stator comprises substantially straight outer edges parallel to the outer edges of the air impeller and extending only slightly outside the plane defined by a tangent to the outer rim of the bladed wheel.  
     
     
         5 . Air impeller as defined in  claim 1 , in which the motor is a synchronous motor provided with permanent magnets, characterized in that the permanent magnets ( 51 ) are disposed on the circumference of the bladed wheel.  
     
     
         6 . Air impeller as defined in  claim 5 , characterized in that the permanent magnets ( 51 ) are of a curved shape.  
     
     
         7 . Housing for an air impeller, said air impeller comprising a frame, a bladed wheel ( 4 ) provided with blades ( 42 ) for producing a substantially axial flow of a gaseous medium, an alternating-current motor ( 5 ) for rotating the bladed wheel, said alternating-current motor comprising a fixed stator ( 52 - 54 ) and a rotating rotor, and a frequency converter ( 6 ) or inverter for controlling the alternating-current motor, and  
       in which the rotor of the electric motor is integrated with the bladed wheel ( 4 ), being placed on its circumference, and the stator is placed in the frame of the air impeller outside the rotor so that the stator produces rotation of both the rotor and the bladed wheel,  
       characterized in that the housing forms the frame of the air impeller, that it accommodates the shaft ( 3 ) of the bladed wheel, and that it comprises a space ( 23 ) for the frequency converter or inverter so that the frequency converter ( 6 ) or inverter is integrated with the stator or a part of it to form a unitary, self-contained frequency-converter or inverter-controlled air impeller structure.  
     
     
         8 . Housing as defined in  claim 7 , characterized in that the housing consists of two halves attached to each other, preferably a front half and a back half ( 1 ,  2 ).  
     
     
         9 . Housing as defined in  claim 7 , characterized in that the housing forms a mounting base having fastening elements for the stator, the bearings and the frequency converter or inverter, said mounting base functioning as a lead-through element for the motor conductors from the motor space into the housing of the frequency converter or inverter.