inverter for motor control

[motorguy]

i am designing an inverter using igbt modules for single phase 1/2 hp motor now i am facing this problem that ouput from modules is a square wave of amplitude of dc link i want to create smoothing to get sine wave
what are the methods used for smoothing if there are any online article on this subject plz let me know

regards
motorguy

 

[xnuke]

It's called a filter.

xnuke

Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[ScottyUK]

motorguy,

You need to switch the IGBTs at high frequency (few kHz) and modulate the switching pattern so you can use a low pass filter to regenerate something resembling a sinusoid.

Power electronics is not the friendliest place to learn basic electronics design - if you get it wrong, it is both expensive and dangerous when it goes bang. You sound like you need to buy a few good books on the subject, and then apply what you have learned. At the low power level you are considering, much of the information relating to Class D amplifier design will be relevant to your application.