Method and apparatus for detecting stator faults in rotary dynam

Details Method and apparatus for detecting stator faults in rotary dynam Method and apparatus for detecting stator faults in rotary dynam

1992-01-23

1993-10-12

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

324545, G01R 3102

Patent

active

052529150

ABSTRACT:
In order to determine the occurrence of a stator fault in an induction motor during operation of the motor, the axial leakage flux is monitored during operation of the motor. The occurrence of a stator fault is detected by observing a change in selected harmonic components of the axial leakage. The angular position of the fault with respect to a datum position is determined by noting and recording changes in the axial leakage flux at a plurality of positions distributed symmetrically around the axis of the motor and computing the angular position by triangulation. The axial leakage flux is detected by individual search coils located at said plurality of positions.

REFERENCES:
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patent: 4230961 (1980-10-01), Calfo et al.
patent: 4377784 (1983-03-01), Saito et al.
patent: 4761703 (1988-08-01), Kliman et al.
patent: 4808932 (1989-02-01), Schulz, Jr. et al.
patent: 4851766 (1989-07-01), Shiobara et al.
patent: 4884023 (1989-11-01), Schmidt et al.
J. Penman et al., --"Condition Monitoring of Electrical Drives" Proc. Inst. Electrical Engineers, Part B, vol. 133, No. 3, May 1986.
G. B. Kliman et al.--"Noninvasive Detection of Broken Rotor Bars in Operating Induction Motors"--1988 IEEE pp. 1-7.

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