Effects of switching frequency and motor speed on common mode voltage, common mode current and shaft voltage in PWM inverter-fed induction motors

High-frequency components and large amplitudes of the common mode voltage (CMV) at the motor neutral point generate high-frequency common mode current (CMC) to the ground path and induce voltage on the shaft, which eventually reduces the machine life. This paper presents the effect of switching frequency and motor speed on CMV, CMC and shaft voltage. Three parameters viz. common mode voltage peak factor, common mode current peak factor and shaft voltage peak factor are proposed to define the stresses generated at ground wall insulation and bearings when induction motor is operated with inverter. The results can be used for verifying the feasibility of the mitigation techniques for CMV and bearing currents at different switching frequencies and motor speed.

[1]  S. Srinivas,et al.  Bearing Currents and Shaft Voltage Reduction in Dual-Inverter-Fed Open-End Winding Induction Motor With Reduced CMV PWM Methods , 2015, IEEE Transactions on Industrial Electronics.

[2]  E Sharifi,et al.  Analysis of thermal stresses in medium-voltage motor coils under repetitive fast pulse and high-frequency voltages , 2010, IEEE Transactions on Dielectrics and Electrical Insulation.

[3]  H. Akagi,et al.  Experimental Discussions on a Shaft End-to-End Voltage Appearing in an Inverter-Driven Motor , 2009, IEEE Transactions on Power Electronics.

[4]  Richard A. Lukaszewski,et al.  Common-mode voltage reduction PWM algorithm for AC drives , 2009, 2009 IEEE Energy Conversion Congress and Exposition.

[5]  D. R. Tutakne,et al.  Effect of pulse width modulated voltage on induction motor insulation , 2012, 2012 7th IEEE Conference on Industrial Electronics and Applications (ICIEA).

[6]  A. Cavallini,et al.  Effect of supply voltage frequency on testing of insulation system , 2006, IEEE Transactions on Dielectrics and Electrical Insulation.

[7]  Antoni Arias,et al.  Reduction of Output Common Mode Voltage Using a Novel SVM Implementation in Matrix Converters for Improved Motor Lifetime , 2014, IEEE Transactions on Industrial Electronics.

[8]  M. Renge,et al.  Five-Level Diode Clamped Inverter to EliminateCommon Mode Voltage and Reduce $dv/dt$ inMedium Voltage Rating Induction Motor Drives , 2008, IEEE Transactions on Power Electronics.

[9]  Annette Muetze,et al.  Calculation of Circulating Bearing Currents in Machines of Inverter-Based Drive Systems , 2004, IEEE Transactions on Industrial Electronics.

[10]  D. R. Tutakne,et al.  Fuzzy logic application to life estimation of phase angle controlled induction motors , 2009, 2009 IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives.

[11]  T. Bengtsson,et al.  Dielectric heating in insulating materials subjected to voltage waveforms with high harmonic content , 2009, IEEE Transactions on Dielectrics and Electrical Insulation.

[12]  Andreas Binder,et al.  High-Frequency Induction Machine Modeling for Common Mode Current and Bearing Voltage Calculation , 2014, IEEE Transactions on Industry Applications.

[13]  D. Vamshy,et al.  A Hybrid Filter for the Suppression of Common-Mode Voltage and Differential Mode Harmonics in Three-Phase Inverters with CPPM , 2016 .

[14]  Hirofumi Akagi,et al.  A Passive EMI Filter for Eliminating Both Bearing Current and Ground Leakage Current from an Inverter-Driven Motor , 2005 .

[15]  Hirofumi Akagi,et al.  Identification and Discussion of the Origin of a Shaft End-to-End Voltage in an Inverter-Driven Motor , 2010, IEEE Transactions on Power Electronics.