| 摘要 |
A rotary electric machine such as a vehicle AC generator includes a multi-phase armature winding, a stator core, a rotor including a magnetic field coil and a plurality of poles, an unbalance detecting coil, and a comparator circuit for comparing an output signal of the unbalance detecting circuit with a threshold value. If the AC generator fails, a voltage induced in the unbalanced detecting coil becomes larger than the threshold value, and an alarm is be outputted.
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