Optimizing Motor Thermal Models

Author

Zocholl, S.E.

Author_Institution

Schweitzer Eng. Labs., Inc., Holland, PA

fYear

2006

fDate

11-15 Sept. 2006

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

induction motors; machine theory; rotors; stators; thermal analysis; constant load test; cyclic load test; differential equation; high-inertia drive motor; induction motor thermal limitation; motor thermal model optimization; rotor limiting temperature; rotor thermal model; slip-dependent watt; stator limiting temperature; stator thermal model; thermal limit curve; thermal protection; time-discrete form; 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

Petroleum and Chemical Industry Conference, 2006. PCIC '06. Record of Conference Papers - IEEE Industry Applications Society 53rd Annual

Conference_Location

Philadelphia, PA

ISSN

0090-3507

Print_ISBN

1-4244-0558-0

Electronic_ISBN

0090-3507

Type

conf

DOI

10.1109/PCICON.2006.359713

Filename

4199073