Hotpoint WM62X Motor Speed Problem?

[V6John]

Hi Guy’s,
Hope you might be able to help me.
I was feeling very pleased with myself after successfully fitting a new drum spider, door seal and door interlock to our faithful machine. Then a few weeks later it has started throwing the belt off at every opportunity.
It seems the motor is trying to go to it’s highest speed, instantly, no-matter where you start the machine up in it’s programme.
I’ve read some things about soft start and speed control devices on the internet, but can’t find any specific diagnosis advice for my problem.
Any advice? Time to give up?
Regards,
John

[washtronics]

Re: Hotpoint WM62X Motor Speed Problem?

maybe a broken wire around the motor terminal block. try removing the wiring block and pull each individual wire-you may find one that is defective

[iadom]

Re: Hotpoint WM62X Motor Speed Problem?

It can also be caused by tacho magnet faults, what type of motor do you have, the early GDA/Hotpoint motor or the later FHP/AEG motor?

If it is the earlier GDA motor, is the round, thin metal casing still attached to the centre, front of the motor?

[V6John]

Re: Hotpoint WM62X Motor Speed Problem?

Thanks for your replies.
No broken or loose wires at either the motor end or at the PCB end.
6 terminals/wires.
Have checked the motor but no manufacturers id on it. There is a label with 904/1158/10 marked on it, and states “For Electronic Speed Control” RPM 800/15000 and Wo 80/220.
There does not appear to be any seperate metal casing at the front pulley end of the motor. There is a circular device around the rear end of the motor with two yellow wires connected to it which emerge from inside the motor.

[iadom]

Re: Hotpoint WM62X Motor Speed Problem?

We generally call the pulley end the back of the motor. 😉

THIS is a GDA/Hotpoint motor and clearly shows the shiny round metal tacho cap in the centre of the motor, does yours look exactly like this?

[V6John]

Re: Hotpoint WM62X Motor Speed Problem?

That’s the one!
So the “front” of the motor is the brushes end?
The circular device around the end of the shaft here is a tacho then? It seems to be floating around inside it’s bracket somewhat. Is that the problem?

[iadom]

Re: Hotpoint WM62X Motor Speed Problem?

The outer metal cover of the tacho is used to adjust the speed. It should by fairly tight onto the end of the motor but you can turn it in either direction to adjust. If it is completely adrift then it will spin out of control. If it seems quite secure then the small tacho magnet that is screwed into the end of the motor shaft may have broken or just come loose.

[V6John]

Re: Hotpoint WM62X Motor Speed Problem?

I’ve had a look at the video. Motor is very similar but the tacho magnet is not the same. Magnet is held onto the end of the motor shaft by a dome headed Philips screw.It’s tight and not broken at all. Is it a coil around the magnet?
If so, this coil is held in place by a metal bracket secured by two small Philips screws. There does not appear to be any circular adjustment around the magnet as the “coil” terminal block is housed into the end of the motor casing to prevent it turning.
Is the motor speed control on the PCB then?

[iadom]

Re: Hotpoint WM62X Motor Speed Problem?

You have the later GDA/Hotpoint digitally controlled motor.

Examine the two yellow wires very carefully, they did sometimes chafe on the motor alloy casting.

The motor controls are on the timer/PCB unit, generally quite reliable and not prone to causing this fault, its almost always motor tacho/magnet or bad wiring connections to blame TBH.

If you have a megger or multimeter you could check the continuity/resistance of the tacho coil, rarely fails but I have seen the odd one go O/C.

[Author]

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