Arrangement for measuring the slip of electric induction motors

Details Arrangement for measuring the slip of electric induction motors Arrangement for measuring the slip of electric induction motors

1987-10-03

1989-12-26

Karlsen, Ernest F.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

With rotor

318490, 340648, G01R 3102

Patent

active

048900583

ABSTRACT:
An arrangement for measuring the slip of electric induction motors determines the relative measure of the difference between rotary field speed and rotor speed of induction motors by utilizing the nonlinearity effects of the magnetization characteristics of ferromagnetic materials. Slip-proportional current and/or voltage signals are detected at the terminals of the induction motor. By suitable processing of these slip-proportional signals, such as frequency conversion and filtering, a frequency-proportional measure of the slip is provided which is then subjectable to measuring or further processing.

REFERENCES:
patent: 2654860 (1953-10-01), Lewis
patent: 4123009 (1978-10-01), Kilpinen
patent: 4562396 (1985-12-01), Espelage et al.
"Die elektrische Messung von Drehzahl und Wikelgeschwindigkeit", Verlage E. Geyer Bad Worishofen (1974).
"Identifikation linearer zeitvarianter SYsteme und ihre Anwendung auf Induktionsmachinen", Dr. Franz Hillenbrand (1982).
"FFT Schnelle Fourier-Transformation", E. Oran Brigham (1985).
"Adaptive Signal Processing", Bernard Widrow et al.
European Search Report, 08/04/88.
"Steady State Characteristics of a Torque and Speed Control System of an Induction Motor Utilizing Rotor Slot . . . ", Isida et al., 8292 I.E.E.E. Transactions on Power Electronics, PE-2 (Jul. 3, 1987).
"Leakage Field Changes of an Induction Motor as Indication of Nonsymmetric Supply", Erlicki et al., I.E.E.E. Transactions on Industry and General Application, vol. IGA-7, No. 6, Nov./Dec. 1971.

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