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Motors in series?

Discussion in 'Sensors and Actuators' started by Arnak, Feb 8, 2014.

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  1. Arnak


    Apr 1, 2011

    Can someone help me please?

    I need to know if it is possible to link 2 x PC case cooling fans running on 7-13 volts dc together in series to run from a 24 volt dc supply?

    Presumably these are brushless motors, which I have heard cannot be used in series as they do not work when connected in that manner.


  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    Jan 21, 2010
    I have long been someone who has suggested not to place these in series in other threads :)

    However, it just occurred to me that if you place a (say) 14V zener diode across each fan, this would act to prevent large changes in the voltage across each fan.

    Be VERY careful that your power supply doesn't rise over 28V and monitor how warm they get. I'd start with 1W zeners and see how they behave.

    A capacitor across the zeners (say 100uF to 1000uF) might further improve the behaviour if needed.
  3. Arnak


    Apr 1, 2011
    Motors in series.

    Hi Steve,

    Thanks very much for your informative reply.

    That sounds like an excellent way of connecting the motors in series.:D

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