Non-invasive speed measurement of inverter driven induction motors

T. C. Green, B. W. Williams, D. S. Schramm

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)


A frequency component in the stator current of the induction motor which is caused by rotor dynamic eccentricity is used for a noninvasive speed measurement. The frequency of this component is related to the rotor speed, and its bandwidth is related to the supply frequency and the phase-lock-loop RC filter cutoff frequency. In the case of an inverter drive, the signal can be extracted from the phase current reconstructed from the DC link current. The use of switched-capacitor filters allows a frequency component related to the rotor speed to be extracted from the DC link of variable-frequency, inverter-driven induction motors.

Original languageEnglish
Title of host publicationConference Record - IAS Annual Meeting (IEEE Industry Applications Society)
Number of pages4
Publication statusPublished - 1990
Event1990 IEEE Industry Applications Society Annual Meeting - Seattle, WA, USA
Duration: 7 Oct 199012 Oct 1990


Conference1990 IEEE Industry Applications Society Annual Meeting
Abbreviated titleIAS-25 Part 1 (of 2)
CitySeattle, WA, USA


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