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Decreasing voltage to motor

Discussion in 'Sensors and Actuators' started by mollekake, Jul 6, 2014.

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  1. mollekake

    mollekake

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    Jun 30, 2014
    Hello all.
    I am wondering about something.
    I have this thing i'm working on, and i have motor.
    I want to slow it down, which i assume i can do by decreasing the voltage output to it.
    So my question is, how do i do that most effectively?
    im going to connect it to a microcontroller and have it go at different speeds, depending on which pin i output to.
    The microcontroller i have is a PIC16f1824 (my last one :p )

    Any help is appreciated :)
     
  2. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    Use PWM for this. If you don't run the motor out you could have issues like increased current consumption which could damage the motor. You also reduce torque, it is better to operate a motor with full supply for a shorter amount of time.
    Adam
     
    (*steve*) likes this.
  3. shumifan50

    shumifan50

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    Jan 16, 2014
    If you don't fancy building it yourself, you can get motor speed controllers from many hobby shops or robotics sites. But it will depend on the size of the motor and its power requirements. I have also found that not all motors handle PWM well - some lose power quite quickly when the duty cycle decreases, some become very noisy.
     
  4. KrisBlueNZ

    KrisBlueNZ Sadly passed away in 2015

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  5. mollekake

    mollekake

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    Jun 30, 2014
    Thanks guys. Not used PWM before. Got any tutorials or good guides for a newbie on PIC PWM?
     
  6. shumifan50

    shumifan50

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    Jan 16, 2014
    The PIC data sheets document it quite nicely.
     
  7. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

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    Talk about pushing him in off the deep end!

    Here is an example circuit using a 555 to do what you want to do. I have some reservations about their circuit, but it may do what you want.
     
  8. shumifan50

    shumifan50

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    Jan 16, 2014
  9. BobK

    BobK

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    Jan 5, 2010
    shumifan50 and KrisBlueNZ like this.
  10. shumifan50

    shumifan50

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    Jan 16, 2014
    That is true. I did not stop to think. I have only used PWM for blind control and needed bi-directional control.
     
  11. Arouse1973

    Arouse1973 Adam

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    Dec 18, 2013
    You can also use the H Bridge as a motor break if you need to slow it down quickly.
    Adam
     
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