On 24/05/2021 00:44, Cursitor Doom wrote:
On Sun, 23 May 2021 23:29:16 +0100, Fredxx
wrote:

I've read your posts but can't see anywhere where you've checked
continuity of the 2 windings that should have a common connection.

I'm not at all familiar with the internals of those motors and didn't
even know they have 2 windings.

A 2 split/two phase motor will generally have 2 windings. One is across
the mains, and the other will be through your capacitor.

You will still get a hum if only one functions, or where there is a
short circuit turn.

Yes, I can see what you're getting at.

Can you measure these? Also what is the voltage across the cap when
switched on?

I can measure the voltage across the cap no problem and I *could*
measure the windings continuity and resistance if I knew which wires
in the rat's nest underneath go where. Sadly I have no info to assist,
however.

Unless it's fitted with a no-volts contactor the wiring should be simple.

https://electricalvoice.com/permanen...duction-motor/

Does the motor get hot very quickly?

I should imagine even a good motor that's on but not turning will get
hot pretty quick.

A 150W motor will sit an hum for a minute without overheating the windings.

Motors really aren't my thing, obviously. These crappy Chinese pieces
of junk (sourced from B&Q in this instance) aren't worth spending much
investigative time on anyway.

These motors are incredibly simple. Sometimes it's quicker to fix a
fault than to survey the market and buy a new one.

If you see 0V across the capacitor then the auxiliary winding is O/C.

If you see 240V then the auxiliary winding probably has a shorted turn.

I think in normal working you would expect to see greater than mains
voltage across the capacitor BICBW.