TRIAC Fan Speed Control

[SBTECH]

Dear Edaboard Community ,

I am using the circuit in the attachment without problem while i am driving fan motors up to 0.8 kw . In order to reduce cost i tried to remove L2 chooke inductor (150mH) in the drawing. It is a special made toroid inductor and costs money. When I removed the inductor and shorted that path ,my circuit still works as it works before.

I think that this inductor is for limiting current when starting the motor. I have 0.8 Kwatt fan motor in my lab and even it starts without any problem. So what is your suggestion about removing that inductor ?

I use BTA16-600CW snubberless triac . Btw , even i remove RC Snubber network it still works ok .

Many thanks

 

[iop95]

In this application, inductor main role is not to limit starting current, it's to reduce distorsions / harmonics injected in power grid (EMI). Sure work w/o this inductor but maybe will not pass an EMI testing. For commercial selling, EMI testing/aproval it's an important step in lunching a product on market.