Patent · US Expired

Method for automated measurement of the ohmic rotor resistance of an asynchronous machine

US6774664B2 · kind B2 · utility

93Cited by
5References
6Claims
0Family size

Assignee

Inventor

Key dates

Filing dateFeb 28, 2002
Grant dateAug 10, 2004
Priority date—
Expiry dateApr 11, 2022

Classification

  • Technology area (CPC G)Physics
  • CPC primaryG01R31/346
  • WIPO fieldMeasurement
  • WIPO sectorInstruments

Abstract

Method of automated measurement of the ohmic rotor resistance (Rr) of an asynchronous machine (1) controlled via an inverter (8) while being acted upon by a non-rotating field, the method involving a. measuring the ohmic stator resistance (Rs), the leakage inductances (L&sgr;s, L&sgr;r) and the main inductance (Lm) of the asynchronous machine, b. leading a testing signal (Usa) being formed by a predetermined direct signal with a superimposed alternating signal corresponding approximately to the nominal slip frequency (fs) of the asynchronous machine (1), c. measuring the amplitude and the phase (&phgr;) of the phase signal (Isa) resulting from the testing signal, and d. calculating the ohmic rotor resistance (Rr) from the measured values according to a) and c).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.