fundamental circuit design of ac drives

If you are a beginner in this field, first try these links and it will help.

For VFD:

http://oee.nrcan.gc.ca/industrial/equipment/vfd/index.cfm?attr=24

http://www.joliettech.com/what_is_a_variable_frequency_drive.htm

If you have time, you can use this link for Soft Starter (I found it a good document for soft starter):

http://library.abb.com/global/scot/scot209.nsf/veritydisplay/2985284834bcff7fc1256f3a00274038/$file/1sfc132002m0201.pdf

-MS

thank you friend............

i went through the articles you recommended. now i want to know the circuit which are required to fire the igbts at regular or at desired angle as to control the voltage and frequency of the inverter output....

hoping to receive your co-operation

Hi this is FARRUKH ADNAN the recent problem which you are facing tell me that i have done specialization in the field of variable frequency drives D.C drives Servo drive but you suppose to tell me that which motor r u using then i will let you know that what will be you next action got it so do inform me as soon as u can.