Effects of Direct Torque Control Switching Strategies on Common Voltage and Bearing Current

Subject Areas : Renewable energy

Mohammad Taghi Sadeghzadeh ¹ , Gholam Reza Arab ² , Amir Hossein Mirzaian ³ , Seyed Mohammad Madani ⁴

1 - MSc/Iran National Gas Co.
2 - Associated Professor/ Shahrekord University
3 - MSc/ Shahrekord University
4 - Assistant Professor/Isfahan University

Received: 2011-05-01 Accepted : 2012-01-22 Published : 2013-06-01

Keywords: DTC, Bearing current, Common voltage,

Abstract :

Bearing current sininduction motorsare considered a sone of the most damaging factors. Induced shaft voltage through the parasitic capacitors cause this type of current. Inthispaper,given the increasing importance of direct torque control of induction motorin industry, various switching tables are assessed in order to ensure the lowest common voltage while maintaining the performance characteristics of the drive. Finally best switching table based on the minimum CMV, less torque rippleand better quality out put reference tracking is proposed.