Title :
A practical guide to understanding bearing damage related to PWM drives
Author :
Macdonald, Don ; Gray, Will
Author_Institution :
Toshiba Int. Corp., USA
Abstract :
The performance and reliability of AC adjustable speed drives (ASDs) is continually improving. One of the key reasons for improvement has been the advent, development and use of pulse width modulated (PWM) drives utilizing faster switching devices, primarily insulated gate bipolar transistors (IGBTs). As with many other developments, improvements in some areas may cause problems in others. An increased bearing failure rate in motors is one of the negative effects of these types of drives. To mitigate bearing current damage in motors, as well as in loads and other auxiliary equipment attached to the motor shaft, it is important to understand how these currents are generated. In addition to theoretical explanations, actual field cases and solutions are reviewed.
Keywords :
AC motor drives; DC-AC power convertors; PWM invertors; machine bearings; reliability; rotors; stators; variable speed drives; AC adjustable speed drives; PWM inverters; auxiliary equipment; bearing current damage mitigation; bearing damage guidelines; bearing failure rate; insulated gate bipolar transistors; loads; motor shaft; performance; reliability; Couplings; IEEE members; Insulated gate bipolar transistors; Microscopy; Pulse width modulation; Rotors; Shafts; Stator cores; Variable speed drives; Voltage;
Conference_Titel :
Pulp and Paper Industry Technical Conference, 1998. Conference Record of 1998 Annual
Conference_Location :
Portland, ME, USA
Print_ISBN :
0-7803-4785-4
DOI :
10.1109/PAPCON.1998.685517
