| 摘要 |
PURPOSE:To enable faults to be detected in the range from armature windings to a rectifier, by setting the resistance of a phase ring higher than the resistance of a branch circuit, and only by providing the armature winding side of the phase ring with detecting elements. CONSTITUTION:When a rotor 8 is rotated and exciting current is conducted to a field magnet 18, then three phase alternating current is generated on armature windings 12. The alternating current is applied to a rotary rectifier through a connecting conductor 16. The, if there is any fault on the armature windings 12, the current on the windings is unbalanced. By the armature windings 12 and detecting elements 30 arranged at specified intervals, the unbalancing condition is detected an the fault is detected. besides, if there is any fault on the rectifier, the current on branch circuits 60a-60f is unbalanced. Then, the value of the resistance R of a phase ring 50 is set sufficiently larger than that of the resistance(r) of the branch circuit, and so said unbalanced current is transmitted to the armature windings 12, and also in this case, faults can be detected by the detecting elements 30.
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