| 摘要 |
A multi-fan assembly with a built in electromagnetic control device composed of a magnetic induction mask fixedly received in a space in a rotatable member, a magnetic flux coil fixedly connected to a central main shaft and snugly surrounded by the magnetic induction mask, and a current control unit also fixedly connected to a central main shaft, wherein the current control unit sends a desired current to the magnetic flux coil to produce a magnetic flux which magnetizes the silicon steel core of the magnetic flux coil to attract the metal magnetic induction mask thereby generating a resistant force to reduce the revolving speed of the two member fans round the central main shaft. Three options are designed for manipulating the current coming out of the current control unit; a direct wired wall control switch, or a wireless remote controlling using infra-red design or an automatic speed control using a speed detecting sensor.
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