| 摘要 |
PCT No. PCT/JP82/00161 Sec. 371 Date Dec. 15, 1982 Sec. 102(e) Date Dec. 15, 1982 PCT Filed May 10, 1982 PCT Pub. No. WO82/04164 PCT Pub. Date Nov. 25, 1982.A supervisory unit for detecting abnormalities in shaft voltage of rotary electrical machinery and apparatus such as brushless synchronous machines. The supervisory unit includes a first detector for detecting the voltage across at least two points of the rotor shaft, a second detector for detecting the voltage between the rotor shaft and ground, and a third detector for detecting an electrical condition of an AC exciter which constitutes part of the field system of the apparatus. The third detector may detect electrical signals indicative of the field system voltage or the field system current. The supervisory unit includes a voltage comparator and a frequency comparator which receive detection signals from the three detectors to provide a signal indicating abnormality when an abnormal condition occurs, such as contact failure of a grounding brush or a failure in coil insulation.
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