mesuthh Posted January 17, 2011 Report Share Posted January 17, 2011 Hello people;I really need help friendsI am tring to drive a single phase (230V AC) motor 4A with BT137(8A), but triac gets hot like 35 celcius degree (even I am using cooler) and after some switching it is getting failed. So that later on I have changed the triac with BTA41(40A) and heatshink, but it is still hot around 30 degree, and in one week BTA41 also gets failing. I am tring to drve the triac with Moc3041, and I am tring to switching the triac when 5Vdc available on Moc3041.I have tried to use snubber but it is not solving the problemyou can reach the view of my circuit on here I am triying drive the motor with 5V dc control to moc3041 so triac fries and the motor starts, and one more think I am also drving a 25uf 400 V capacitor (paralell with the motor) with that motor for compansatingif someone has an advice I will be really thankfull to him/herRegards Quote Link to comment Share on other sites More sharing options...
Hero999 Posted January 17, 2011 Report Share Posted January 17, 2011 TRIACs don't like switching capacitive loads.You probably also need a snubber network to protect the TRIAC from the back EMF. Quote Link to comment Share on other sites More sharing options...
mesuthh Posted January 17, 2011 Author Report Share Posted January 17, 2011 thank you for your reply sirI have tried a snuber network as moc3041 datasheet advice but it did not solve my problem.do you have a specific idea for snubber for this circuit, or is there any calculation for snubbing depending for the loadregards Quote Link to comment Share on other sites More sharing options...
cachehiker Posted January 18, 2011 Report Share Posted January 18, 2011 Basic 2 or 4-pole induction motor? Any idea of its resistance or inductance?I think the snubber is likely where it's at. What values did you use?You may have to use a larger one to limit 1000W of reactive load to 25 V/ Quote Link to comment Share on other sites More sharing options...
GelecG Posted December 2, 2011 Report Share Posted December 2, 2011 I have driving 2.2 HP single phase ac induction motor with capacitor like you. AND bta41 failing.snubber and zero crossing is correct.but bta41 in full load suddenly failed. can you help me? Quote Link to comment Share on other sites More sharing options...
Guest kimico Posted April 16, 2012 Report Share Posted April 16, 2012 The two motor driving rollers of the centrifugal casting machine must keep synchronous and keep load balance。 ;D Quote Link to comment Share on other sites More sharing options...
hotwaterwizard Posted April 17, 2012 Report Share Posted April 17, 2012 http://www.electro-tech-online.com/electronic-projects-design-ideas-reviews/93323-switching-ac-loads-triac.htmlI think the resistor is too small needs to be 330BT137 Datasheethttp://www.nxp.com/documents/data_sheet/BT137_SERIES.pdfBTA41http://www.st.com/internet/com/TECHNICAL_RESOURCES/TECHNICAL_LITERATURE/DATASHEET/CD00002263.pdfMoc3041 Datasheethttp://www.electro-tech-online.com/custompdfs/2009/05/moc3041.pdf Quote Link to comment Share on other sites More sharing options...
Guest ccsintlcircuits Posted June 6, 2012 Report Share Posted June 6, 2012 This one is the great post in which we get information regarding the power driving motor. Quote Link to comment Share on other sites More sharing options...
Guest swarner11 Posted June 17, 2014 Report Share Posted June 17, 2014 'hotwaterwizard' you told us very thoroughly, thanks for your links but I found a little error in Moc3041 datasheet. Quote Link to comment Share on other sites More sharing options...
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