1)Problems associated with using conventional PWM type frequency converter
http://www.pdma.com/VFDtest.html
2 ) Earth leakage protection devices to be used with drives - problems & solutions http://www.telemecanique.com/85256E540060851A/all/852566B70073220C85256E130056BB1C/$File/vvg998gb.pdf
3)NFO sensorless vector control is similar to (ABB http://www.abb-drives.com/StdDrives/RestrictedPages/Marketing/Documentation/files/PRoducts/DTCTechGuide1.pdf, Emotron http://www.emotron.com/en/company/innovations/Direct-Torque/) DTC ( Direct Torque Control) - It is built in the same way based on having mathematical module of AC motor in the inverters memory, auto tuning parameters of the AC motor connected to the inverter ( once only) ,directly measuring and comparing the electromagnitic state of the motor and controlling the motors variables of torque and flux.
It works in the following way: Before running autotuning,it needs to enter the nominal motor data, parameters P-nom,U-nom,F-nom,N-nom,I-nom,and cos f. These are usually shown on the motor plate,and must be entered for the connection for which the motor is to be used(Y or D).
Once you have entered the parameters, you can run the Tuning command,which has to be confirmed to run. The motor parameters are then recorded and saved to the respective motor parameters.
http://www.abb-drives.com/StdDrives/RestrictedPages/Marketing/Documentation/files/PRoducts/DTCTechGuide1.pdf
4) EMC Filter Guide
http://www.reo.co.uk/files/corel_designer_9_0_-_emc_draft_book.pdf
5) Motors windings Insulation problems in AC drives with PWM type frequency converters
http://www.vonroll.com/downloads/ANISIDM.pdf
6)Motor insulation Voltage Stresses under IGBT inverter operation
http://www.gambica.org.uk/pdfs/Report1_3rd%20Edition.pdf
7)Bearing currents under PWM inverter operation
http://www.gambica.org.uk/pdfs/Report2_2nd_ed.pdf
8) Предотбращение аварий двигателя при его подключении к Преобразобателя Частоты на IGBT
http://www.regr-is.ru/pdfs/nagr.pdf
AC Drive & Automation
