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In need of help with AC motor!

nameuser

Jun 13, 2017
3
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Jun 13, 2017
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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
 

Bluejets

Oct 5, 2014
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Oct 5, 2014
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6,901
Find the specs written on the defective capacitor and replace with the same size and voltage rating.
 

Minder

Apr 24, 2015
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Apr 24, 2015
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I would definitely find a N.Amer replacement, Chinese versions are unreliable, ensure it is AC Motor Run rated.
M.
 

73's de Edd

Aug 21, 2015
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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:

nameuser

Jun 13, 2017
3
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Jun 13, 2017
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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
 

nameuser

Jun 13, 2017
3
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Jun 13, 2017
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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
 

duke37

Jan 9, 2011
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Jan 9, 2011
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5,364
Ifr this is an induction motor it will not make a generator unless it is coupled to a stiff AC supply.
 

Minder

Apr 24, 2015
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Normally a RPC uses a 3phase motor, fed from 240 1ph.
Never seen it done with a 1ph motor.
M.
 
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