Electric motor help, please.

[tlovatt]

On a single phase motor the start capacitor produces a phase shift onto the start windings, this both to help with the starting under load and to ensure a consistant direction of starting.

You should end up with the main windings connected live to neutal, and the starter windings connected with a capacitor in series for it to work properly, then if the motor runs in the wrong direction you change over 1 set of winding connections (i.e. you reverse the connections on the starting windings, or the main windings, not both)

 

[normspanners]

I saw a RPC once that had a converted small engine rope started fitted on the fan end I thought that was a good idea as there was no messing and no chance of the rope staying stuck and rewinding. The thought of that makes me cringe having broken my wrist starting a power wash !

 

[MattF]

How on earth did you manage that?

 

[Pete.]

How on earth did you manage that?

He was trying to get the dirt out from under his nails

 

[McNamara]

Little update for anyone interested!

I took another look around the old 1.5hp motor
and got a new start capacitor 80-100 mfd.
When installed the motor turned *slightly* and blew
the fuse as before!

So I opened her up again and after working out the
Operation of the clutch I thought it was missing a contact
pad (like those you find in engines for the points).

I temporarily (?) repaired this with a brass pin/rivet from a
plug socket and she runs perfect!

So it seems the motor was attempting to start on the main
or run windings rather than the start windings.

I'm back to say thanks to you all, otherwise it would
have been left in the shed or scrapped. Very pleased
with it, and I have got the 3 phase motors running with
Run capacitors. They just need a start cap wiring into a
switch for startup ( followed a guy on YouTube called
Andy Reynolds, if anyone is interested)

Many thanks again

Ash

 

[McNamara]

Just checked the old capacitor and that works too, if not
better than the replacement so I can try one of these when
i work out how to wire up some switches for the 3 phase
motors.

It's been a good day!

Ash