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Single phase motor

Discussion in 'Sensors and Actuators' started by gregrae, Mar 27, 2017.

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  1. gregrae

    gregrae

    67
    1
    Jan 12, 2011
    I would like to know if any one can help me with the wirering of a 240 v single phase motor .
    The motor has a capacitor run and capacitor start.with a cintrifical switch.
    I have most wirers in place but have one that I do not where it goes.
    I have photoes of the wirering in the motor connections that I can post if there is someone that can help me
     
    csxvn likes this.
  2. Tha fios agaibh

    Tha fios agaibh

    2,088
    699
    Aug 11, 2014
    Post your pictures. I'm sure we can help you figure it out.
     
  3. gregrae

    gregrae

    67
    1
    Jan 12, 2011
     
  4. Tha fios agaibh

    Tha fios agaibh

    2,088
    699
    Aug 11, 2014
    Screenshot_2017-03-27-17-28-04-1.png
     
  5. Tha fios agaibh

    Tha fios agaibh

    2,088
    699
    Aug 11, 2014
    Nothing to say to yourself?
     
  6. gregrae

    gregrae

    67
    1
    Jan 12, 2011
    I apologise but the motor in question I was informed it was burnt out on to windings even though the ohm meter did not pick it up.There was a hole burnt through the insulation where the windings go through the motor.
    Having baught another New motor with a similar problem there is a wirer that is not connected from the reset switch .
    Does it connect to the active that comes into the motor .
    I will try to post a photo.
     

    Attached Files:

  7. Tha fios agaibh

    Tha fios agaibh

    2,088
    699
    Aug 11, 2014
    Can you show us the motor itself?
    The shroud picture doesn't help me.

    Look for a name plate or id sticker on the motor and take a picture.
    Also what kind of motor is it?
    Model number?
    Btw, The brass jumpers shown in your pic is for changing voltage.
     
  8. gregrae

    gregrae

    67
    1
    Jan 12, 2011
    I have attached a photo of information on the motor Could you tell me if you require more
     

    Attached Files:

  9. Tha fios agaibh

    Tha fios agaibh

    2,088
    699
    Aug 11, 2014
    Ahh, I hate dealing with Chinese stuff. Poorly built, poorly documented and usually horrible trying to communicate with the rep.

    I can't tell for sure from what I see.

    First look on the underside of the cover for a wiring diagram. That'd be a big help.
    I honestly don't trust the diagram furnished from ebay. It shows negative and positive wires. This is an AC motor, not DC.
    It'd be better if a diagram came from the motor manufacture directly. (the nameplate mounted on the motor is blurry in ebay pictures so I can't tell from there) You need to know which wires go where. I don't see labeling on the screws or the wires.

    If you can't get clarification from supplier, then you can isolate the 3 wires coming directly from motor windings to figure out which is the start winding, which is run winding, and common wire of them.

    By the way, there is no mention of a centrifugal switch in the motor that's used to disconnect start winding when motor ramps up to speed.
     
  10. gregrae

    gregrae

    67
    1
    Jan 12, 2011
    If I open the motor how do you recognise the start winding and run winding
     
  11. gregrae

    gregrae

    67
    1
    Jan 12, 2011
    I am unable to get a circuit digram I have taken a photo of the plate and posted it
    I hope this can help
     

    Attached Files:

  12. Tha fios agaibh

    Tha fios agaibh

    2,088
    699
    Aug 11, 2014
    You don't have to take it apart.
    Just undo wires from motor from terminal block and label them 1,2-3 or something to keep track of them.
    Then measure ohms between each wire and note the 3 resistances.
    Also, whats the (uf) value of the capacitors?
     
    Last edited: Mar 31, 2017
  13. Tha fios agaibh

    Tha fios agaibh

    2,088
    699
    Aug 11, 2014
    If possible use an analog meter to take measurements. Using lowest ohm scale cross both leads together and zero needle reading.
    If you can't zero the reading with leads crossed, just make note of lead resistance so you can subtract it from your measured values later.
    If you only have three wires from motor;
    I'd expect one combination of wire readings to read about 1.5-2 ohms, this is the run winding. The next combination should be about 10 ohms, this is the start winding.
    The third combination will be both resistances or about 12 ohms. Once these two wires are found, the remaining (untouched) wire is the common point of the two windings that will tie to either Line or Neutral (grounded conductor) of your circuit.
     
    Last edited: Mar 31, 2017
  14. Tha fios agaibh

    Tha fios agaibh

    2,088
    699
    Aug 11, 2014
    The start winding should have a 250uf start capacitor wired in series with it, as well as a switch that disconnects this winding when motor reaches about 2/3 full speed.
     
  15. gregrae

    gregrae

    67
    1
    Jan 12, 2011
    The 3 resistances on the motor winding are 1.2 ohms , 2.5 ohms , 4.4 ohms.
    The motor has 2 capacitors one is 250uf and the other is 40 uf
     
  16. gregrae

    gregrae

    67
    1
    Jan 12, 2011
    I hope the information can help you make the decision where the wirer from the overload switch
     
  17. gregrae

    gregrae

    67
    1
    Jan 12, 2011
    Can someone tell me wich one is the run winding and run cap.
    What one is the start winding and the capacitor.
    The information is above in the previous posts
     
  18. Minder

    Minder

    2,948
    623
    Apr 24, 2015
    The start capacitor is the 250uf the run is the 40uf
    Usually the run winding is the lowest resistance.
    The highest the start winding.
    If you wanted to confirm the start winding you could always back drive the motor with a drill etc, and measure with ohmeter when the open circuit occurs which is between 1/3 to 2/3 of max rpm.
    M.
    .
     
  19. gregrae

    gregrae

    67
    1
    Jan 12, 2011
    I have attached a ohm reading of the windings .
    Can you explain where the two capacitors are installed for run and start .
    A drawing would be helpful
    I want the motor to go anti - clock.
    Thank you
     

    Attached Files:

  20. gregrae

    gregrae

    67
    1
    Jan 12, 2011
    Can you explain what 2.5 ohm winding is .
     
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