Apparatus for detecting faults to be occurred or initially exist

Details Apparatus for detecting faults to be occurred or initially exist Apparatus for detecting faults to be occurred or initially exist

1978-01-18

1980-07-08

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324 51, G01R 3102

Patent

active

042119731

ABSTRACT:
Apparatus for detecting possible changes or variations in the dimension of an air gap of a running electric rotary machine during operation thereof. Detector coils are each accommodated within respective slots formed in the stator core of the machine, the coils being geometrically separated from one another at an angular distance corresponding to the distance between poles or its integral multiple. The detector coils are electrically connected in series with each other to produce a voltage for detection. The detector coils are so connected that the fundamental waves of the voltages induced in two detector coils will cancel each other and a synthesized value of higher harmonics induced in both detector coils is picked up as the detection voltage signal. The number of slots of the rotor of the electric rotary machine is predetermined to a limited number in order to get a detection signal of higher quality.

REFERENCES:
patent: 2640100 (1953-05-01), Packer et al.
patent: 2939074 (1960-05-01), Perrett

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