Title :
Online efficiency determination of three phase asynchronous machines by start-up data
Author :
Waldhart, Florian ; Bacher, J.B.
Author_Institution :
Inst. of Drive Technol. & Electr. Machines, Graz, Austria
fDate :
Aug. 31 20096-Sept. 3 2009
Abstract :
There are various methods to determine the efficiency of three phase induction machines. But all of them have in common that they are too inaccurate or they are impracticable. In this paper the machine efficiency will be derived from start up data. For that purpose the time dependence of all stator currents and all stator voltages have to be measured. Normally it isn´t possible to mount a speed sensor on the machine. Therefore, only the speed at the end of the start up can be determined. Practical results with standard three phase induction machines with different power ranges from 3 kW up to 500 kW are presented.
Keywords :
induction motors; vectors; online efficiency determination; speed sensor; three phase asynchronous machines; three phase induction machines; Acceleration; Equations; Equivalent circuits; Induction motors; Rotors; Short circuit currents; Stators; Testing; Torque measurement; Voltage; current circle diagram; efficiency; induction motors; online; space vector; start up data;
Conference_Titel :
Diagnostics for Electric Machines, Power Electronics and Drives, 2009. SDEMPED 2009. IEEE International Symposium on
Conference_Location :
Cargese
Print_ISBN :
978-1-4244-3441-1
DOI :
10.1109/DEMPED.2009.5292795
