Outer rotor type brushless dc motor

Details Outer rotor type brushless dc motor Outer rotor type brushless dc motor

H - Electricity

02

K

H02K 1/06 (2006.01) H02K 1/18 (2006.01) H02K 1/27 (2006.01) H02K 5/04 (2006.01) H02K 21/22 (2006.01) H02K 29/00 (2006.01) H02K 1/28 (2006.01) H02K 5/15 (2006.01) H02K 5/16 (2006.01) H02K 5/24 (2006.01)

Patent

CA 2117719

An outer rotor type brushless DC motor has: a first housing member formed of a sheet metal by press-working and having a first central bearing receiver also formed by press-working in the form of generally hollow cylinder; a second housing member formed from a sheet metal by press-working and having a second central bearing receiver also pressed in the form of generally hollow cylinder; a hollow cylindrical stator support formed of a sheet metal by press-working and having one end mounted on the first bearing receiver of the first housing member and another end for receiving the stator on the outer surface of the stator support; a magnets support press-worked from a electrical steel sheet metal for supporting magnets around the stator and inside the second housing member; a first bearing mounted in the first bearing receiver; a second bearing mounted in the second bearing receiver coaxially with the first bearing; and a freely rotatable shaft mounted on the first and second bearings, for firmly supporting thereon the stator support. The motor may be assembled in simple steps without any molding to suppress vibrations and noises. The motor has a suitable design for mass production.

Cette invention concerne un moteur c.c. sans balais et à rotor extérieur qui comprend : une première moitié de carcasse en tôle métallique emboutie et comportant un premier logement de roulement centré également obtenu par emboutissage et ayant la forme générale d'un cylindre creux; une seconde moitié de carcasse en tôle métallique emboutie et comportant un second logement de roulement centré également obtenu par emboutissage et ayant la forme générale d'un cylindre creux; un support de stator cylindrique creux embouti dont une des extrémités s'insère dans le logement de roulement de la première moitié de carcasse et l'autre reçoit sur sa face extérieure le stator du moteur; un porte-aimants en tôle électrique emboutie servant à supporter les aimants autour du stator et à l'intérieur de la seconde moitié de carcasse; un premier roulement monté dans le premier logement de roulement; un second roulement monté dans le second logement de roulement se trouvant sur le même axe que le premier; et un arbre tournant monté dans lesdits premier et second roulements pour soutenir fermement le support de stator. Le moteur s'assemble par étapes simples ne nécessitant aucun surmoulurage d'atténuation des vibrations et du bruit. Il se prête à la production en grande série.

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