| 摘要 |
PURPOSE: To obtain a small-sized, light-weight motor in which the temperature rise is small at the detector part by disposing a fan, fitted firmly to the rotary shaft, between a counter-load side bracket and a detector securing part. CONSTITUTION: A fan 19 is fitted firmly to a rotary shaft 5 and when the rotary shaft 5 of a motor is rotated, heat is transmitted from a rotor 8 through the rotary shaft 5 toward a detector and the temperature rises at a detector securing part 10 and a detector rotating part 9 thus causing temperature rise of the ambient air. But a fan 19 disposed in a space 17 between a counter-load side bracket 4 and the detector securing part 10 rotates to circulate the air in the space 17 as shown by arrows. Consequently, local temperature rise of the air around the detector securing part 10 or the detector rotating part 9 can be prevented and the temperature of the air is made uniform over the spaces 16, 17. Since the heat is dissipated well from the detector securing part 10 or the detector rotating part 9, a small-sized, light-weight motor where temperature rise of the detector is small can be obtained. |
