Can I change the rotation of this electric motor?

Discussion in 'General Electronics Chat' started by OGRE, Apr 6, 2014.

  1. OGRE

    Thread Starter Member

    May 31, 2013
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    I just got done rebuilding this drill press. I did the powder coating on it. Replaced all its bearings. Soaked all parts for days in my electrolysis tanks (rust removal). Swapped the 1/2 hp motor for a 3/4. Had to tear it apart as well. Had years of dirt and grime inside. Added link belts to minimize vibration. Finally got this thing back together yesterday. I go out today just to try it out on some 3/16 metal I had and it would only make but a small indentation in the metal. I try changing speeds and still no luck even drilling in wood.
    Turns out the motor is turning CCW :mad::( Took me way to long to figure this was my problem lol...Anyway, I really dont want to spend money on another motor unless I have no other option. It says rotation can't be changed, but is there some way to do this without having the windings redone???? Any help or advice is greatly appreciated.

    [​IMG][​IMG]
     
  2. OGRE

    Thread Starter Member

    May 31, 2013
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  3. #12

    Expert

    Nov 30, 2010
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    There are 2 ways to reverse a non-reversible motor; mount it upside down or assemble it with the shaft sticking out the other end. One is difficult and the other seems impossible.
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    ...OR open it and dig into the winding connections, identify the start and/or run winding and do a reversal.
    Max.
     
  5. inwo

    Well-Known Member

    Nov 7, 2013
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    Can't tell from the picture. Is that a start capacitor (red) or part of the mount?
    If it is, disconnect it.

    Motor will not start.
    Give it a reverse spin to start.

    If that works there may be a way.
     
    #12 likes this.
  6. OGRE

    Thread Starter Member

    May 31, 2013
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    yes that is the cap.
     
  7. #12

    Expert

    Nov 30, 2010
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    Max and inwo have 2 good ideas that I didn't think of.
    Personally, I'd be lost trying to find the ends of the windings and reversing them, but push starting it backwards seems achievable. Depends on exactly how it's built. Please report back here if you get lucky.
     
  8. OGRE

    Thread Starter Member

    May 31, 2013
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    Just tried running it without the cap with no luck. I went ahead and opened the motor back up. Not sure exactly which wires I would try to switch:confused:
    [​IMG][​IMG]
     
  9. OGRE

    Thread Starter Member

    May 31, 2013
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  10. OGRE

    Thread Starter Member

    May 31, 2013
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    how would I determine which is which?
     
  11. #12

    Expert

    Nov 30, 2010
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    What's the gizmo mounted on the end plate? Does this thing have a centrifugal switch?
     
  12. OGRE

    Thread Starter Member

    May 31, 2013
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    I don't think so. the red and yellow are the leads from the windings that connect to it. theres a black wire that comes from the thermal protection switch that connects to it also.
     
  13. OGRE

    Thread Starter Member

    May 31, 2013
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    Before it was cleaned up[​IMG]
     
  14. MaxHeadRoom

    Expert

    Jul 18, 2013
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    There are essentially two windings, being a 2 pole motor, you can see the two distinct windings, in a uni-directional motor, the ends of the start winding and run winding are connected together.
    The start winding goes through the centrifugal switch, red and yellow, the trouble is the junction may be buried a little under other windings as it was never intended to be exposed.
    Of the two windings, one has to be reversed WRT to the other.
    Max.
     
  15. Aikixtal

    New Member

    Apr 6, 2014
    7
    1
    The startup winding would most likely have the starter cap on it.

    The motor is driving a pulley, yes? Why not put another pulley or gear in line with the drill mechanism that reverses the drill mechanism rather than futzing with the motor?
     
  16. inwo

    Well-Known Member

    Nov 7, 2013
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    Does the power connect to Yellow(switch) and black (thermal device)?

    You may have to dig out those splices to find the other end of windings.
    They seem visible in picture.

    It looks like there are 4 leads going into the windings. If there are only two windings as Max suggests, trial and error with power limited may find the right connection.

    I'm afraid that there may be more windings. Often there are two run windings for series parallel. (120/240)

    The start winding (5&8 when numbered) is then in parallel to one of the run windings. Always seeing 120V whether connected 120 0r 240.

    I'm puzzled as to why you couldn't get motor to run without cap in circuit.
     
  17. tcmtech

    Well-Known Member

    Nov 4, 2013
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    The black lead going to the thermal overload switch is the primary power lead.

    The blue and orange are the feeds to the run and start windings. The other ends would be the yellow and red leads.

    Which ever lead is the opposite end of the red lead that went to the start capacitor is the other end of your start winding. Just switch those end to end or flip the run winding leads end to end to reverse your motor.
     
  18. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
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    Get a longer belt and do a cross/over.
     
    Metalmann, Aikixtal and shortbus like this.
  19. Electric Al

    Member

    Nov 6, 2013
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    If you are not sure , and you want to use this motor , my advice would be .....


    Take it in to a motor repair shop , I am sure they will be able to help you .

    To hard to diagnose from a picture !
     
  20. Aikixtal

    New Member

    Apr 6, 2014
    7
    1
    Yup. The elegant mechanical solution, easy to maintain and fix, far less chance of something going wrong. Dont reverse the motor, reverse the mechanism.
     
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