Title :
PWM-control methods for common mode voltage minimization - a survey
Author :
Hofmann, W. ; Zitzelsberger, J.
Author_Institution :
Electr. Machines & Drives, Chemnitz Univ. of Technol.
Abstract :
The common mode voltages produced by fast switching IGBT-PWM inverters are often the reason for bearing damages. These are caused by the current flow through the bearing after breakdown of the bearing lubricating film. The decisive current parts in the medium power range are the electric discharge machining current and the dv/dt-current. They are dependent of internal motor conditions, amplitude and common mode voltage rise. Therefore it is useful to modify the PWM so that these causes can be reduced. In this contribution the known PWM-methods for reduction of common mode voltages are compared with the help of some essential criteria like modulation index, switching frequency, harmonic content, and isolation stressing of motor windings
Keywords :
PWM invertors; discharges (electric); electric breakdown; machine bearings; machine windings; power semiconductor switches; switching convertors; PWM-control methods; bearing damages; bearing lubricating film breakdown; common mode voltage minimization; current flow; electric discharge machining current; fast switching IGBT-PWM inverters; harmonic content; internal motor conditions; isolation stressing; modulation index; motor windings; switching frequency; AC motors; Electric breakdown; Insulated gate bipolar transistors; Machining; Minimization methods; Pulse width modulation; Pulse width modulation inverters; Roentgenium; Stators; Voltage;
Conference_Titel :
Power Electronics, Electrical Drives, Automation and Motion, 2006. SPEEDAM 2006. International Symposium on
Conference_Location :
Taormina
Print_ISBN :
1-4244-0193-3
DOI :
10.1109/SPEEDAM.2006.1649943
