Novice question on a simple motor and rocker switches

Discussion in 'General Electronics Chat' started by MarkLSE, Jun 5, 2019.

  1. MarkLSE

    Thread Starter New Member

    Jun 5, 2019
    1
    0
    I have a 12V motor that is bidirectional. Ground (black) and Voltage (red) wiring. Reversing the contacts reverses the rotation of the motor.
    I'd like to install a rocker switch to control the direction of the rotation.
    Does a 3 way (On, Off, On) work? Or maybe a better question is what type of switch should I use?
    Maybe the concept of Clockwise rotation, Off, CounterClockwise rotation is a better description of what Im trying to accomplish.
    Thanks
     
  2. AnalogKid

    AAC Fanatic!

    Aug 1, 2013
    7,934
    2,240
    You need a double pole double throw (DPDT) switch rated for a minimum of twice the operating current of the motor. Whether or not you need a center-off position is up to you; it does not change the switch wiring. Your motor might have a different opinion; many of them do not being slammed into full reverse repeatedly.

    Generally speaking, rotary switches do not handle high currents as well as toggles or rockers do.

    Please post whatever information you have on the motor: operating current, starting current, manufacturer, model number, web site, etc.

    ak
     
  3. wayneh

    Expert

    Sep 9, 2010
    16,099
    6,212
    Yes. What you want to avoid is not having the "off" position in between. Not only do you want to be able to turn it off, but it's good to let the motor come to a stop before reversing direction.
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
    18,410
    5,654
    You can get DPDT centre off switches with an automatic pause at centre, this prevents the undesirable action of instant reverse.
    You have to release the toggle at OFF before you can go to reverse.
    Max.
     
  5. KeepItSimpleStupid

    AAC Fanatic!

    Mar 4, 2014
    3,443
    632
    I would suggest an (on)-OFF-(on) switch with two SPDT automotive relays. the () indicate momentary. If there is no middle position, none is usually used.

    The advantage is that you have a better choice of switches and you can employ dynamic braking.

    This could be another type of application where the suggested method is not appropriate.

    The switch would basically work like an automotive window and the motor will stop immediately

    When operating the switch, you "should" pause between changing direction.

    You can add limit switches as lomg as they are rated for the relay current, about 150 mA.

    www.partsexpress.com has the relays and even a dual socket, mostly wired for power door lock applications.
     
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