Machine characterization for short-term or instantaneous torque capabilities: An approach based on transient thermal response

Veysel T. Buyukdegirmenci, Philip T. Krein

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

Abstract

This paper investigates short-term torque capability maximization in electric machines based on thermal time ratings. To understand time ratings, machine transient thermal response is divided into four regimes: subtransient, transition, transient, and temperature creep. Each regime is discussed separately. For modest overload conditions, an exponential characteristic based on limited geometric data is formulated for the time ratings, while for severe overload cases, linear temperature rise linked to known 'i-squared-t' (i 2t) conductor rating approaches suffice to characterize the temperature rise. It is shown that both exponential and i2t methods fail to provide accurate estimates for moderate overload operation. In such cases heat transfer inside the machine is solved analytically to obtain time ratings. Experiments with a 5 hp induction machine were conducted to evaluate the thermal characteristics and insulation material properties. This machine is used to validate the theoretical foundation presented for time ratings. The results show that time rating estimation based on limited geometric data is accurate within an error range of about 7%. Implementation of these time ratings for real-time torque maximization is discussed.

Original languageEnglish (US)
Title of host publicationProceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013
Pages801-808
Number of pages8
DOIs
StatePublished - Aug 22 2013
Event2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013 - Chicago, IL, United States
Duration: May 12 2013May 15 2013

Publication series

NameProceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013

Other

Other2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013
CountryUnited States
CityChicago, IL
Period5/12/135/15/13

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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    Buyukdegirmenci, V. T., & Krein, P. T. (2013). Machine characterization for short-term or instantaneous torque capabilities: An approach based on transient thermal response. In Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013 (pp. 801-808). [6556185] (Proceedings of the 2013 IEEE International Electric Machines and Drives Conference, IEMDC 2013). https://doi.org/10.1109/IEMDC.2013.6556185