| 摘要 |
PURPOSE:To improve the cooling effect of a motor, by a method wherein a small fan is provided for a motor shaft to be freely rotated between the motor and a driving pulley having a motor cooling blade on the lower face. CONSTITUTION:When a motor 1 is driven, negative pressure is applied to the lower part of a fan section 4 by a blade 5 for a driving pulley 3 and air flowing through the lower part of the motor 1 to the upper part is generated and the motor 1 is cooled by the air. Then, a small fan 6 is rotated by a frictional force on a shaft bearing 8 face in contact with the shaft for the motor 1. Then, if the motor 1 stops, the driving pulley 3 stops in the same way but the small fan 6 is continuously rotated with attenuation by coasting at the time of driving. Therefore, hot air between the driving pulley 3 and the motor 1 is discharged outside by a small blade 7 for the small fan 6. |
