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1. (WO2014204056) BRUSHLESS DC MOTOR AND ELECTRIC BICYCLE USING THE MOTOR

Pub. No.:    WO/2014/204056    International Application No.:    PCT/KR2013/009613
Publication Date: Thu Dec 25 00:59:59 CET 2014 International Filing Date: Tue Oct 29 00:59:59 CET 2013
IPC: H02K 1/27
H02K 29/00
Applicants: KOREA POWERTRAIN CO., LTD.
한국파워트레인 주식회사
Inventors: BAE, Jong Jun
배종준
LEE, Won Ho
이원호
JANG, Jae-Duk
장재덕
JOO, In-Sik
주인식
Title: BRUSHLESS DC MOTOR AND ELECTRIC BICYCLE USING THE MOTOR
Abstract:
A brushless DC motor according to the present invention comprises: a stator coupled to the outer circumference of a shaft; a plurality of electromagnets radially coupled to the outer circumference side of the stator; a rotor arranged on the outside of the stator; and a plurality of permanent magnets arranged on the inner circumference side of the rotor, wherein the rotor comprises insertion-coupling groove portions, which are arranged at a specific distance away from each other, for insertion-coupling an s-pole permanent magnet or an n-pole permanent magnet, and protrusions which are arranged between the insertion-coupling groove portions, and the front end of the inner circumferential surface of which protrudes as far as a surface of the s-pole magnet or the n-pole magnet facing the stator.