Title :
Optimizing Motor Thermal Models
Author_Institution :
Schweitzer Eng. Labs., Inc., Holland, PA
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;
Conference_Titel :
Petroleum and Chemical Industry Conference, 2006. PCIC '06. Record of Conference Papers - IEEE Industry Applications Society 53rd Annual
Conference_Location :
Philadelphia, PA
Print_ISBN :
1-4244-0558-0
Electronic_ISBN :
0090-3507
DOI :
10.1109/PCICON.2006.359713
