External rotor motor

H - Electricity – 02 – K

Patent

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Details

H02K 5/04 (2006.01) H02K 1/18 (2006.01) H05K 7/20 (2006.01) H02K 3/52 (2006.01) H02K 5/173 (2006.01)

Patent

CA 2454877

An improved external rotor motor, suitable for driving a cooling fan, has a structure which facilitates automated assembly with proper angular registration of its components. The motor has an external rotor (42) with a central shaft (40) which is rotatably supported inside a bearing support tube (38) having a tapered outer surface (98) formed with a circumferential stop (100) and a plurality of longitudinal guide grooves (102). An inner stator structure (22) is located radially between the bearing support tube (38) and the rotor (42). The inner stator has an internal recess (36) containing a securing ring or disk (20) with inwardly extending tabs (34). During assembly of the inner stator onto the bearing support tube (38), the tabs of the securing ring slide in the guide grooves (102), then bend to form barbs (34') which engage into the outer surface (98) of the bearing support tube, thereby securing the stator (22) on the bearing support tube in a precisely predefined angular orientation. The circumferential stop (100) assures insertion of the bearing support tube to the correct depth.

L'invention concerne un moteur de rotor externe amélioré, destiné à un ventilateur et comprenant une structure qui facilite l'assemblage automatisé avec un enregistrement angulaire approprié de ses composants. Le moteur comporte un rotor externe (42) muni d'un arbre central (40) qui est supporté par rotation à l'intérieur d'un tuyau de palier-support (38) ayant une surface externe tronconique (98) formée par un butoir circonférentiel (100) et une pluralité de rainures de guidage longitudinales (102). Une structure de stator interne (22) est située radialement entre le tuyau de palier-support (38) et le rotor (42). Le stator interne comporte un évidement intérieur (36) comportant un anneau ou un disque de fixation (20) pourvu de volet déployés vers l'intérieur (34). Durant l'assemblage du stator interne au tuyau de palier-support (38), les volets de l'anneau de fixation glissent dans les rainures de guidage (102), puis se plient pour former des barbelures (34') qui entrent en prise avec la surface externe (98) du tuyau de palier-support, fixant ainsi le stator (22) au tuyau de palier-support selon une orientation angulaire prédéfinie de manière précise. Le butoir circonférentiel (100) assure l'insertion du tuyau de palier-support à la bonne profondeur.

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