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 AC Motor Speed Controller
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richb
New Member

2 Posts

Posted - Feb 22 2015 :  04:02:26 AM  Show Profile  Reply with Quote
Had a question on the AC Motor Speed Controller circuit. Would this circuit hold up with a 15A load?

Would the Triac need to be larger than 15A? I did not notice a Diac with a 15A rating. What would be suitable for a Diac ?

Could you advise a resistance value for R13 given the above load ?

Thank you

Aaron Cake
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Canada
6708 Posts

Posted - Feb 28 2015 :  10:27:26 AM  Show Profile  Visit Aaron Cake's Homepage  Send Aaron Cake an ICQ Message  Send Aaron Cake a Yahoo! Message  Reply with Quote
As the notes say, you'll need to choose the TRIAC based on your load. Load ratings will be in the datasheet. Once you have the TRIAC, then R13 can be adjusted.
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richb
New Member

2 Posts

Posted - Feb 28 2015 :  2:36:58 PM  Show Profile  Reply with Quote
Aaron, thanks for the note.
I have a single phase 120V 15A saw that currently runs around 3400 rpm. I would like to reduce the rpm to around 1300. I thought the above mentioned circuit, configured for the load, might allow for this.
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