Method and apparatus for measuring the resistance of the winding

Details Method and apparatus for measuring the resistance of the winding Method and apparatus for measuring the resistance of the winding

1988-07-13

1989-05-09

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Conductor identification or location

Inaccessible

318490, 324522, 324546, 324158MG, 340648, 363 41, G01R 2708

Patent

active

048292346

ABSTRACT:
A method and apparatus for measuring the resistance of a winding of a converter-fed single- or three-phase machine during operation by means of a d-c measuring current. The firing instant of at least one up-commutating valve of a maching converter is delayed by a predetermined variable setting angle for generating d-c measuring currents in the phase currents, whereby the current conduction time of the up-commutating valve is shortened and the current conduction time of a valve commutating down with the valve which is commutating up with delay, is lengthened. The generated d-c measuring current is filtered out of the measured machine current and the generated interlinked d-c measuring voltage is filtered out of a measured terminal voltage of the single- or three-phase machine, and the winding resistance is determined from the linked d-c measuring voltage and the d-c measuring current by forming a quotient. Thus, it is possible to measure a winding resistance in a converter-fed three-phase machine during operation without using a nonlinear resistance circuit in a connecting lead.

REFERENCES:
patent: 3656136 (1972-04-01), Blair
patent: 4458196 (1984-07-01), Goyal et al.
patent: 4498044 (1985-02-01), Horn
patent: 4520298 (1985-05-01), Abbondanti
patent: 4562390 (1985-12-01), Tobise
patent: 4651086 (1987-03-01), Domenichini et al.

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