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General Category => Analog discussion => Topic started by: Mosquito on March 04, 2008, 14:40:56 PM

Title: I need to control a fan speed
Post by: Mosquito on March 04, 2008, 14:40:56 PM
I need to control a fan speed and i am thinking of using a dimmer design that i found. This designs does not make clear if it can be used for controlling the fan. It is a 220V 50Hz fan. Should i test it?
Title: Re: I need to control a fan speed
Post by: kam on March 04, 2008, 15:16:35 PM
It is most likely impossible for a dimmer to be designed with the capability to control inductive load. An inductive load must have an appropriate output.

Get it in examples:

3566.pdf (http://us.st.com/stonline/books/pdf/docs/3566.pdf)
triacd.pdf (http://www.spelektroniikka.fi/kuvat/triacd.pdf)
Title: Re: I need to control a fan speed
Post by: tpone on March 04, 2008, 16:30:39 PM
Well, it looks like we are on a same level. LOL

actually i have already test it and i only can say... do not bother...
Title: Re: I need to control a fan speed
Post by: Andre on March 04, 2008, 19:22:32 PM
For low speeds it might work. If you get to high speeds... konflikt
Title: Re: I need to control a fan speed
Post by: ScubaCap on March 04, 2008, 22:21:07 PM
A dimmer is a dimmer and a controller is a controller.  :P
Title: Re: I need to control a fan speed
Post by: manley_V on March 04, 2008, 23:53:36 PM
Is it possible to control AC motor with PWM?
Title: Re: I need to control a fan speed
Post by: kam on March 05, 2008, 08:16:57 AM
Absolutely not. You can efficiently control DC with PWM but not AC
Title: Re: I need to control a fan speed
Post by: ScubaCap on March 13, 2008, 00:19:26 AM
What range do you want to control it and with what step? There are several ways to do it.
Title: Re: I need to control a fan speed
Post by: manley_V on March 18, 2008, 00:02:33 AM
What range do you want to control it and with what step? There are several ways to do it.

What do yo mean? I want to control it from 0 to max rpm proportionally.

But i think i have found a way to do it.
Title: Re: I need to control a fan speed
Post by: kam on March 18, 2008, 21:29:26 PM
Can you share it with us?