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|1. (WO2014204056) BRUSHLESS DC MOTOR AND ELECTRIC BICYCLE USING THE MOTOR|
|Applicants:||KOREA POWERTRAIN CO., LTD.
|Inventors:||BAE, Jong Jun
LEE, Won Ho
|Title:||BRUSHLESS DC MOTOR AND ELECTRIC BICYCLE USING THE MOTOR|
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.