Title :
On the bearing currents in medium power variable speed AC drives
Author :
Ollila, Jaakko ; Hammar, Tuomo ; Iisakkala, Jarkko ; Tuusa, H.
Author_Institution :
Tampere Univ. of Technol., Finland
Abstract :
This paper shows a new reason for the cause of bearing damages in medium power AC motor drives. Laboratory and field tests with a 250 kW induction motor show that this new phenomenon is dominant with IEC 355 frame size motors, where insulated bearings are not generally used. Field detection and the elimination of the bearing current problem is discussed in detail
Keywords :
induction motor drives; machine bearings; machine testing; variable speed drives; 250 kW; IEC 355 frame size motors; bearing currents; field detection; field tests; induction motor; laboratory tests; variable speed AC motor drives; Capacitance; Current measurement; IEC standards; Induction motors; Laboratories; Magnetic field measurement; Shafts; Stators; Testing; Voltage;
Conference_Titel :
Electric Machines and Drives Conference Record, 1997. IEEE International
Conference_Location :
Milwaukee, WI
Print_ISBN :
0-7803-3946-0
DOI :
10.1109/IEMDC.1997.604183
