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Thread: Variable speed controller for 240Vac ceiling fan

  1. 2nd May 2005 03:21 AM #1
    Chin
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    Default Variable speed controller for 240Vac ceiling fan

    I have a ceiling fan using a 3 step (speed) transformer type of control.I am thinking to build an electronics stepless variable speed control. Is it possible to use the dimmer circuit using Triac for lighting? I wonder if the dimmer circuit will be able to withstand the feedback current when we initially turn on the fan. Any suggestion is appreciated.
    Thanks

    Chin
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  2. 2nd May 2005 04:07 AM #2
    ljcox
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    I doubt wheter a light dimmer will be suitable. As you said, the starting current will be large and I expect that the dimmers are not designed for inductive loads.

    Have you done a search of this forum for motor controllers?

    Also try internet sites such as www.discovercircuits.com

    In particular, se http://www.discovercircuits.com/M/motor-cont.htm

    Len
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  3. 2nd May 2005 08:41 AM #3
    Nigel Goodwin
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    Default Re: Variable speed controller for 240Vac ceiling fan

    Quote Originally Posted by Chin
    I have a ceiling fan using a 3 step (speed) transformer type of control.I am thinking to build an electronics stepless variable speed control. Is it possible to use the dimmer circuit using Triac for lighting? I wonder if the dimmer circuit will be able to withstand the feedback current when we initially turn on the fan. Any suggestion is appreciated.
    Those I've seen are not the right type of motor for doing that, I would stick to the switched speed control - they generally either switch different capacitors or transformer windings.
    PIC programmer software, and PIC Tutorials at:
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  4. 2nd May 2005 08:42 AM #4
    mechie
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    Default Motor speed control

    A domestic light dimmer could well be the easiest answer ...
    http://www.electro-tech-online.com/v...ghlight=dimmer
    http://www.electro-tech-online.com/v...ghlight=dimmer

    My dimmer is still controlling the same Vent Axia extractor fan and is STILL running at low speeds, the fan got jammed solid for a week or so and everything survived just fine (found a dead bird wedged under fan blade ops: )

    No guarantees ... but it's an easy experiment to try :wink:
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    My head is full !
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  5. 6th March 2009 01:51 PM #5
    angel.reign07
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    Quote Originally Posted by Chin View Post
    I have a ceiling fan using a 3 step (speed) transformer type of control.I am thinking to build an electronics stepless variable speed control. Is it possible to use the dimmer circuit using Triac for lighting? I wonder if the dimmer circuit will be able to withstand the feedback current when we initially turn on the fan. Any suggestion is appreciated.
    Thanks

    Chin
    well if i were you i will use the google engine for researching about your topic to have some little information or idea while searching... or maybe i will ask some people that i know they know that can help me for such a problem like that...






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