Title :
A novel online rotor temperature estimator for induction machines based on a cascading motor parameter estimation scheme
Author :
Gao, Zhi ; Habetler, Thomas G. ; Harley, Ronald G. ; Colby, Roy S.
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA
Abstract :
This paper proposes a cascading motor parameter estimation scheme to obtain an online estimate of the rotor temperature for a small to medium size mains-fed induction machine. The stator winding resistance at ambient temperature is the only motor parameter needed as an input. First the inductances are estimated according to the equivalent circuit developed from the rotor flux field orientation. Then the estimated inductances are fed into the rotor resistance estimation algorithm to yield an estimate of the rotor resistance. The rotor speed, obtained from the rotor slot harmonics detection algorithm, is also used as an input to the rotor resistance estimation algorithm. Finally the rotor temperature is calculated from the linear relationship between the temperature and the rotor resistance. Experimental results are shown to validate the proposed scheme with accurate tracking of the rotor temperature rises at different load levels. The whole scheme is fast and reliable and is therefore suitable to be incorporated into an existing rotor thermal protection system.
Keywords :
asynchronous machines; equivalent circuits; machine theory; parameter estimation; rotors; stators; cascading motor parameter estimation; equivalent circuit; inductance estimation; induction machines; online rotor temperature estimator; rotor flux field orientation; rotor resistance estimation; rotor slot harmonics detection; rotor temperature tracking; rotor thermal protection system; stator winding resistance; Detection algorithms; Equivalent circuits; Induction machines; Induction motors; Parameter estimation; Protection; Rotors; Stator windings; Temperature; Yield estimation; Condition monitoring; diagnostics; induction machines; motor parameter estimation; rotor resistance estimation; thermal protection;
Conference_Titel :
Diagnostics for Electric Machines, Power Electronics and Drives, 2005. SDEMPED 2005. 5th IEEE International Symposium on
Conference_Location :
Vienna
Print_ISBN :
978-0-7803-9124-6
Electronic_ISBN :
978-0-7803-9125-3
DOI :
10.1109/DEMPED.2005.4662539