| 摘要 |
PROBLEM TO BE SOLVED: To provide a work machine 1 on which a brushless motor 10 with a self-cooling fan 13 is loaded, which can protect a control substrate 28 for changing polarity of a driving current of the motor 10 from moisture, and which has excellent cooling properties of the control substrate 28.SOLUTION: In the work machine 1, a passage 24 for intake air flow by the self-cooling fan 13 is partitioned from a passage 23 of exhaust stream, and the intake air passage 24 includes a substrate cooling air passage 30 reaching from a suction port 25 opened toward the outward of the work machine 1 to the control substrate 28. The work machine is formed so that the suction port 25 is opened sideways or downward, and the substrate cooling air passage 30 reaches the control substrate 28 after extending upward from the suction port 25. |
