Speed controller on washing machine motor

[Jbrt]

What can I use to control the speed on a washing machine motor? I use it on a faceting machine for polishing rocks. See pictures.

 

[Minder]

It says Universal motor on the label, if it is so, then it will have brushes and run on AC or DC, but being a series motor , it rpm is governed by load.
There is an IC out there originally developed by Motorola for these washing M/C motors that required control.
It is a TDA1085.
If it was built with this IC in mind, there is has to be a simple pulse feedback on the motor shaft.
Usully Opto in nature.
Which it appears the motor has?
chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://radiolux.com.ua/files/pdf/TDA1085C.pdf

 

[Jbrt]

Thanks for the prompt reply. Is this what you are talking about?

 

[Minder]

Yes that is the IC TDA1085

 

[Minder]

If you just need a high speed polisher, then RPM control may not be needed??

 

[Jbrt]

What about something like this? https://www.temu.com/ul/kuiper/un9....h7p2lakOiianbul_7S4mr8P-Nu_51kTxoC4kYQAvD_BwE

 

[Jbrt]

I also have a washing machine motor without bushes but with a capacitor. What can I use to reduce the speed?

 

[poormystic]

I also have a washing machine motor without bushes but with a capacitor. What can I use to reduce the speed?

Hi
I'm thinking that's a split phase motor, whose speed is governed by the frequency of the mains. Sadly, even generating a mains voltage at another frequency won't be satisfactory, because many parts of the motor have been optimised for 60Hz (or 50 Hz) working.
You mightn't think it would make such a difference, but powering 60Hz motors from 50Hz mains for example could even cause fires in the worst case.

 

[Martaine2005]

‘Jeremy Fielding’ on YouTube has excellent videos on this very subject.
It’s important to know what motor you have, and his videos will help you identify and understand yours.
His channel.

 

[Jbrt]

Hi
I'm thinking that's a split phase motor, whose speed is governed by the frequency of the mains. Sadly, even generating a mains voltage at another frequency won't be satisfactory, because many parts of the motor have been optimised for 60Hz (or 50 Hz) working.
You mightn't think it would make such a difference, but powering 60Hz motors from 50Hz mains for example could even cause fires in the worst case.

Thank you very much for the good advice. I will replace that motor with one of the brushed motors with tachometers. I ordered this speed controller; 4000 W (attached pic). It was suggested on a few YouTube videos. What do you think?

 

[Jbrt]

‘Jeremy Fielding’ on YouTube has excellent videos on this very subject.
It’s important to know what motor you have, and his videos will help you identify and understand yours.
His channel.

Hi Martaine, thank you. I looked at a number of them and purchased a 4KW speed controller. When it arrives, I will try it out.

 

[poormystic]

Thank you very much for the good advice. I will replace that motor with one of the brushed motors with tachometers. I ordered this speed controller; 4000 W (attached pic). It was suggested on a few YouTube videos. What do you think?

I hope so? Hard to tell, from a picture.
Most manufacturers seem to provide good supplies for their own motors (the price might make you cry a little)
~M
PS: I see you've already bought your gear, so please let us know how you get on!

 

[Martaine2005]

That speed controller is probably a ‘dimmer’ circuit.
The 4000W rating will be over rated as usual. That said, its max rating is most likely for resistive loads and not an inductive load.
For an inductive load, it will probably be 1/3 of that rating.
But I could be wrong.

 

[Jbrt]

I hope so? Hard to tell, from a picture.
Most manufacturers seem to provide good supplies for their own motors (the price might make you cry a little)
~M
PS: I see you've already bought your gear, so please let us know how you get on!

Thanks M. I paid US15, no postage, so, not too bad. I will most certainly give feedback.

 

[Minder]

You could also try it out on the Universal motor in the OP!

 

[Jbrt]

That speed controller is probably a ‘dimmer’ circuit.
The 4000W rating will be over rated as usual. That said, its max rating is most likely for resistive loads and not an inductive load.
For an inductive load, it will probably be 1/3 of that rating.
But I could be wrong.

I changed the motor for a brushed one. The outfit worked like a charm; that is, for a few minutes, then the speed controller suddenly had no effect as the motor ran uncontrolled. I could not see any damage and the fuse was OK. I just wonder, should I have connected it to the tachometer instead of the motor itself?

 

[Minder]

Most likely blew the Triac in the controller!
I assume you are using a Universal motor, these have very high inrush current if you tried to start with it flat open.

 

[Jbrt]

Most likely blew the Triac in the controller!
I assume you are using a Universal motor, these have very high inrush current if you tried to start with it flat open.

Well, I will just put it down as a bad experience unless I can get a speed controller that is more robust.

 

[Martaine2005]

get a speed controller that is more robust.

Definitely!.

 

[Jbrt]

What about something like this? https://www.mavericksales.co.za/pro...hGjqFYWD-9kHTnqXzIt47IgwfqlQdQZFFR2VDf8RFkWnk