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Tumble dryer motor wiring

Discussion in 'Electronic Repair' started by Swiss Tony, Jun 11, 2007.

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  1. Swiss Tony

    Swiss Tony Guest

    I salvaged a motor from a mates tumble dryer (made by servis I think)
    Not 100% sure on how to wire it up.
    Mounted to the motor is a socket which has 3 wires leading to the motor, 1
    red, 1 white and 1 blue labeled,
    m1 =red wire
    m2 =blue wire
    m3 =white wire
    They disappear into the motor and 2 wires come back out which are red and
    blue, which lead to a capacitor.
    The white wire changes colour when it reaches the inside of the motor(i
    guess due to heat)

    I dont know a huge amount about motors as you can tell.
    I am not sure if this motor just spins one way and has 2 different speed or
    if it is capable of running both directions.
    If its a 2 speed one, I am after the slowest speed setup.

  2. James Sweet

    James Sweet Guest

    Do you have the wiring diagram from the dryer? Usually it's printed inside
    the back cover or folded up in an envelope behind the control panel. It can
    be figured out without that but the diagram makes it easier.
  3. Gary Tait

    Gary Tait Guest

    I think it is a bi-directional motor. You hook neutral to the white
    terminal, and line to either the red or blue terminal, depending on the
    direction you wish it to rotate in.

    If you take the lid off the capacitor, two leads should go in the motor.

    The thing the white wire goes in and comes out brown is the thermal
    overload. It opens of the motor gets too hot. It will close on its own
    when it cools down.
  4. Swiss Tony

    Swiss Tony Guest

    Unfortunatly the dryer is long gone :-(

    Just to confirm Gary Taits post.
    Neutral to the white wire
    Live to either the red or blue depending on the direction i want it to go?

    I will be running this motor for 4+ hours at a time, is it likely that the
    motor will overheat?
    Was thinking about adding a fan to the unused drive shaft to direct air
    through the motor.
  5. James Sweet

    James Sweet Guest

    The only dryer I've ever seen with a reversible motor was a Creda unit that
    was imported from Europe. It had a PSC motor which had one wire to neutral,
    then one of the other wires would go straight to hot, and the other through
    a capacitor to hot. Reversing the motor was accomplished by a relay that
    swapped which hot the capacitor was on.
  6. Swiss Tony

    Swiss Tony Guest

    So can i still wire it up
    Neutral to the white wire
    Live to either the red or blue depending on the direction i want it to go?
    or will this cook it?
  7. James Sweet

    James Sweet Guest

    Probably not, but it won't run either. You need one wire to go to hot, and
    the other wire to go to hot through a capacitor to shift the phase and
    create the rotating field.
  8. Swiss Tony

    Swiss Tony Guest

    So its a scrapheap job then :-(
    Oh well, glad it didnt cost me anything :)
  9. James Sweet

    James Sweet Guest

    Why? The capacitor should be easy to find, it might even be the one attached
    to the motor. Hook it up and try it out.
  10. Not necessarily. Some motors are designed so that the two winding differ
    sufficienty in inductance and resistance to shift the phase without a
    run capacitor.
    Correct, just be patient if you are reluctant to experiment. Someone will
    figure it out.

    What are the ratings of the cap?

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  11. Swiss Tony

    Swiss Tony Guest

    All is good :)
    Neutral to white and live to red, earth to earth, ashes to ashes, dust to
    dust, well maybe not the last 2, but the motor spins and I am happy that I
    dont have to go paying for a new motor.

    Thanks for all your help.
  12. Gary Tait

    Gary Tait Guest

    Yes, do that.
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