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Topic Title: induction single fase motor
Topic Summary: help needed with a wiring problem
Created On: 25 February 2014 09:34 PM
Status: Read Only
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 25 February 2014 09:34 PM
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Joined: 25 February 2014

hello. i have a large induction motor .

more info and picture i posted here Link Removed

I do not know much about these.
I have connected it but dont have a capasitor yet.

when i switch it on i hear a humm and when i turn pulley it starts

after about 2 seconds it seems to switch of and on and of and doest reaches top speed,

why would this be? is it because i dont have a capasitor connected?

aslo on the inside is a little black switch with 2 heatproof wires. is this a overload switch? and does this need to be wired up and how? thx very much.


Edited: 26 February 2014 at 01:39 AM by irishron40
 27 February 2014 08:11 AM
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Joined: 25 February 2008

From what you have described it would appear to me:

- the device which has two heat resistant wires could be a thermal cut-out
- it's not clear why you have tied two wires together
- the capacitor is for initial starting which you have overcome by manual rotation
- the connection which you have to supply would appear to be for starting only if you state it cuts out when running (a mechanical speed switch?)

I would suggest when you do have a capacitor, it is placed in circuit which I have described for starting only.
The other wires may be for the motor main winding; It's not clear what tools you have to check this.

I trust you know the direction of rotation.

If you do get it to work, you would place the thermal cut-out in circuit to disconnect the supply on overtemperature.
Of course all the above is guesswork, and it is up to you to work safely.
I would start at low voltage and work upwards.

Finally the motor manafacturer could be Crompton Parkinson.
 28 February 2014 09:31 AM
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From your pics
It looks like a 1/3hp single phase resilent mount washer motor
If it is then there are two windings, start and run, a centrifugal switch and a thermal overload. These motors don't require a capacitor to start as the start winding is physically shifted on the stator.
If I remember correctly these motors where fitted to servis single and twin tub washers in the 60s.
Hope this is of use.

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