Optimizing Motor Thermal Models

Author

Zocholl, Stanley E.

fYear

2007

fDate

6-11 May 2007

Firstpage

1

Lastpage

9

Abstract

The thermal limitations of induction motors are specified by thermal limit curves that are plots of the limiting temperature of the rotor and stator in units of l²t. This paper discusses the thermal protection provided by rotor and stator thermal models defined by the thermal limit curves and supporting motor data. The thermal model is the time-discrete form of the differential equation for temperature rise due to current and is derived from fundamental principles as shown in the Appendix. The rotor model derives the slip-dependent l²r watts using voltage and current that permit the safe starting of high-inertia drive motors. The performance of the models is shown in constant and cyclic load tests.

Keywords

differential equations; induction motor protection; rotors; stators; cyclic load test; differential equations; high-inertia drive motors; induction motors; limiting temperature; motor thermal models; temperature rise; thermal limit curves; thermal protection; Conductors; Differential equations; Induction motors; Protection; Protective relaying; Resistance heating; Rotors; Stators; Temperature; Thermal engineering; Motor Protection; Thermal Models; Thermal Protection;

fLanguage

English

Publisher

ieee

Conference_Titel

Industrial & Commercial Power Systems Technical Conference, 2007. ICPS 2007. IEEE/IAS

Conference_Location

Edmonton, Alta.

Print_ISBN

1-4244-1291-9

Electronic_ISBN

1-4244-1291-9

Type

conf

DOI

10.1109/ICPS.2007.4292097

Filename

4292097