dsPIC33FJ256GP710 ac motor speed controll

Thread Starter

simplextibi

Joined Feb 10, 2014
1
Hi

I would like to ask if someone has a simple way of controlling 2 pieces of 20W ac 220V 2 wire motors using this dsPIC33?

I been trying to figure out how to control them using a triac circuit for each but no luck

Also can you somehow sense the load on them without the 3rd wire?

I am new to this and would like to do a home project of ventilation


thank you
 

MaxHeadRoom

Joined Jul 18, 2013
28,757
If you want rpm control via Triac, you need a zero cross detection circuit, to get an idea look at Fairchild AN-3006 app note.
Also Google zero cross detection.
Max.
 

THE_RB

Joined Feb 11, 2008
5,438
If you want rpm control via Triac, you need a zero cross detection circuit, to get an idea look at Fairchild AN-3006 app note.
Also Google zero cross detection.
Max.
That's good advice, but you don't always need closed loop control of TRIACS on an AC motor.

For small power motors with a reasonably constant load (like fans) you can just drive the TRIAC with pulses and get a bit of a hit and miss type effect.

If you have RPM feedback to the PIC it will work quite well.
 
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