Control the speed of a 230VAC fan

Hello, I want to control the speed of a 230VAC fan motor like this:

I don’t really understand what circuits are appropiate for dimming lights and which ones are for motor speed (I don’t even know which circuits are for Synchronous or for Asynchronous motors) I found several information about it on Google and I have found this options


Do you think this circuit is appropiate and could be adaptated to be controlled by arduino?


[u]Option3:[/u] See the next schematich:;topic=91274.0;attach=14833 I saw the schematich in this post:,91274.15.html In the post is said that this schematich could be adaptated to work with 230VA

Which option would be appropiate for a fan like that?

Thanks a lot

Well the product description mentions:

The fans can be speed-controlled via a stepless thyristor or a 5-step transformer.

So your options 1 and 2 seem to have the basic theory of what is needed.