Recently, Electric bike is being spotlighted because that is environmentally friendly forms of transport with low noise, low pollution as well as convenience for use. BLOC Motor mainly used for electric bike due to high efficiency and high torque characteristics. But, The structure of BLOC motor produces vibration and cogging torque because of reluctance according to rotating the rotor. The cogging torque is caused by unbala^_@span style=color:#999999 ^_# ... ^_@/span^_#^_@a href=javascript:; onclick=onClickReadNode('NODE01641000');fn_statistics('Z354','null','null'); style='color:#999999;font-size:14px;text-decoration:underline;' ^_#전체 초록 보기^_@/a^_#