Connect with us

In need of help with AC motor!

Discussion in 'Sensors and Actuators' started by nameuser, Jun 13, 2017.

  1. nameuser

    nameuser

    3
    0
    Jun 13, 2017
    I recently came into posseion of this AC motor. my issue is that one of the housing on the top is leaking. im not very fimiiar with AC motors and dont know how to handle it. Any advice would be much appreciated! 20170613_070549.jpg 20170613_070603.jpg 20170613_065630.jpg
     
  2. Bluejets

    Bluejets

    3,519
    714
    Oct 5, 2014
    Find the specs written on the defective capacitor and replace with the same size and voltage rating.
     
  3. Minder

    Minder

    2,871
    594
    Apr 24, 2015
    I would definitely find a N.Amer replacement, Chinese versions are unreliable, ensure it is AC Motor Run rated.
    M.
     
  4. 73's de Edd

    73's de Edd

    2,732
    1,122
    Aug 21, 2015
    Sir nameuser . . . . .

    Usually you don't see anything coming from a dry electrolytic unit like that, unless they explode.
    Usually, failure analysis reveals just a time related gradual drop in capacitance to the state where it can no longer provide its start up boost. That motor is being of 1989-90 vintage.
    Does the unit even hum at all on power up.
    If hummee-hummee, have the motor housing supported solidly. Then take a venetian blind size cord and wrap it around the motor shaft as many turns as it can take , keep it taut, then pull heftily on the cord to get a good spinning while immediately powering up the motor to see if it runs with that mechanical spinnng start. (50/50 chance that you MIGHT have wrapped the cord around in the wrong run direction . . try- try again ! )
    If you then have a running motor, the replacement capacitor spec is a minimum 850 ufd at a preferred 125 V rating.
    The reason why you want to do that pre testing . . . . . .because thats a Buuuuuuunch 'o mammafarads ! and thusly . . . . .being priced accordingly.

    http://www.mouser.com/Passive-Compo...trolytic-Capacitors-Leaded/_/N-5g7r?P=1ybzkxw

    73's de Edd
     
    Last edited: Jun 14, 2017
    Richard9025 likes this.
  5. nameuser

    nameuser

    3
    0
    Jun 13, 2017
    Thank you all for the input, i think it will need to be replaced. For $16 on amazon, thats not bad. Again, thank you all for the prompt and insightful responses
     
  6. Minder

    Minder

    2,871
    594
    Apr 24, 2015
  7. nameuser

    nameuser

    3
    0
    Jun 13, 2017
    i finally got the wire to hook the motor up and it seems to run with and without the leaky start capacitor. However it seems to run slower and make a mild grinding noise without the capacitor. I am not entirely sure if i will replace the part as i may use the motor to make a generator
     
  8. duke37

    duke37

    5,253
    726
    Jan 9, 2011
    Ifr this is an induction motor it will not make a generator unless it is coupled to a stiff AC supply.
     
  9. Minder

    Minder

    2,871
    594
    Apr 24, 2015
    Normally a RPC uses a 3phase motor, fed from 240 1ph.
    Never seen it done with a 1ph motor.
    M.
     
Ask a Question
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments (here). After that, you can post your question and our members will help you out.
Similar Threads
There are no similar threads yet.
Loading...
Electronics Point Logo
Continue to site
Quote of the day

-