christmas inflatable trouble

Discussion in 'General Electronics Chat' started by paul m, Dec 21, 2014.

  1. paul m

    Thread Starter New Member

    Dec 21, 2014
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    I am having trouble with the blower motor on a Christmas inflatable decoration. The motor fails to spin. I plled the fan apart and found that there is a capacitor wired into the system. I don't know if this could be the problem. This device also has lights and sound which I have disconnected. I am running a.c. power direct to the motor and it still won't spin. I did open up the motor and it appears to be in perfect condition inside. No rust or burn marks. I believe this is called a brushless motor. There is no label on the motor. I have 120 volts going to the motor. I have tried spinning the motor while plugged in with no success. Any ideas?
     
  2. wayneh

    Expert

    Sep 9, 2010
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    So the motor spins freely but does absolutely nothing with power applied? (No buzz, or indication that it is trying to spin?)

    That sounds to me like a fuse or thermal cut-out has tripped. Post a photo of the motor.
     
  3. paul m

    Thread Starter New Member

    Dec 21, 2014
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  4. paul m

    Thread Starter New Member

    Dec 21, 2014
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    No hum, no buzz, I have checked the voltage at the connection and I do have 120 volts.
     
  5. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    With power off, what is the DC resistance between the input connections of the motor?
     
  6. paul m

    Thread Starter New Member

    Dec 21, 2014
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    How would I check the d.c resistance of the motor?
     
  7. sdowney717

    Member

    Jul 18, 2012
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    13
    motor looks good inside.
    There is a tiny fuse they wire into the winding, see if it is open. The fuse is used to detect if the motor is overheating, like the bearings are stiff. I lube these with synthetic engine oil 20W, and that always does well.
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,520
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    Appears to be a standard split phase induction motor, you should have three connections (after the Cap) and they should all show continuity.
    Max.
     
  9. paul m

    Thread Starter New Member

    Dec 21, 2014
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    I am not sure what you mean. There are four wires coming out of the motor white and black and then there is a brown and blue going to a capasitor. the white, blue and brown all have continuity. the black has continuity with none.
     
  10. #12

    Expert

    Nov 30, 2010
    16,261
    6,774
    There it is. Black is faulty inside the motor. Go looking for that fuse or thermal disconnect mentioned in post #2.
     
  11. paul m

    Thread Starter New Member

    Dec 21, 2014
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    I did look for the fuse earlier, without success. I will look again. There is a peice of waxy glue where the wires enter the windings. I will peel that back and look inside. Thanks for the help.
     
  12. wayneh

    Expert

    Sep 9, 2010
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    Can you remove those star screws and/or look behind there? I don't think the fuse or whatever should be hard to find, but I could be wrong.
     
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