| 摘要 |
A self-diagnosis means is provided with a fan motor comprising a stator on which a stator coil is mounted, a rotor comprising a permanent magnet and a fan, a Hall device for detecting magnetic pole position of the permanent magnet and a current control means for controlling rotation of the rotor by controlling current to be fed to the stator coil. In an embodiment, the self-diagnosis means judges if the fan motor has drawn to the life. In another embodiment, the self-diagnosis means interrupts the current to be fed to the stator coil when the rotational speed is higher than an allowable value, and restarts the current automatically to return the fan motor into normal operation when the rotational speed is not higher than the allowable value.
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