Patent ID: 6097129
Filing Date: 2000-08-01
Classification: F04D,H02K,H02P,Y10S

Abstract:
An electronically commutated external rotor motor, comprising:an external rotor comprising a cup-shaped housing and a radially magnetized permanent magnet connected to said cup-shaped housing;an interior stator in magnetic interaction with said external rotor;said interior stator comprising a laminated core;said laminated core comprising slots;winding means provided in said slots;said winding means comprising first winding heads proximal to a bottom of said cup-shaped housing and second winding heads positioned distal to said bottom of said cup-shaped housing;said permanent magnet having an en d face remote from said bottom of said cup-shaped housing;at least one galvano-magnetic rotor position sensor for controlling current flow within said winding means;said at least one galvano-magnetic rotor position sensor being arranged substantially opposite to said remote end face of said permanent magnet so as to be located within a magnetic leakage flux of said permanent magnet and within a magnetic leakage flux of said interior stator;a magnetic leakage flux concentrator provided on said interior stator at a side of said second winding heads facing away from said laminated core and at least within an angular area of said interior stator in which said at least one galvano-magnetic rotor position sensor is located.