| 摘要 |
PROBLEM TO BE SOLVED: To prevent the occurrence of nonconformities of an electrical apparatus due to heat by suppressing an increase of temperature in a control box. SOLUTION: A twin fan 1 comprises a partition plate 2 formed of a non- magnetic substance, a motor-driven fan 3 mounted on the one surface 2a of the partition plate 2, and a driven fan 4 mounted on the other surface 2b of the partition plate 2. The motor-driven fan 3 is provided with an impeller 8 on the driven side having a permanent magnet on the driven side and the driven fan 4 is provided with an impeller 13 on the driven side having a magnetic substance part. An impeller 13 on the driven side is rotated to follow the impeller 8 on the driven side, by receiving a magnetically attracting force from the permanent magnet on the drive side of the impeller magnet on the drive side of the impeller 8 on the drive side.
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