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how to make a speed controller for a washing machine motor

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picclock:
@ Philf

Small world - I also worked for Mullards in their New Road factory at Mitcham.

From the values shown in your drawing (by my reckoning  :scratch:) the thyristor will trigger on 1/20th of the peak voltage, every half cycle, assuming the motor back emf is lower than the  set point - (vtrigger +vf diode).

I would be interested to see how it performs if you make one, to see if I am mistaken about my understanding of the circuit.

Best Regards

picclock

philf:

--- Quote from: picclock on December 20, 2016, 02:05:23 AM ---
Small world - I also worked for Mullards in their New Road factory at Mitcham.

picclock

--- End quote ---

Hi Piclock,

I visited the Mitcham factory in around 1973 as well as Southampton, Blackburn (where I did my workshop training) and Simonstone. I also visited several Philips factories in Holland and France.

I think that Hazel Grove is the only one still going although no longer part of the Philips empire. They sold most of the business to a group of venture capitalists and it became NXP with Philips still having an interest. Philips then gave their share to the Pension Fund. (From which I am now benefiting!) The Hazel Grove factory is now in the process of a sale to Nexperia - a Chinese group of investors.

When I was at Blackburn (1970) they were still making valves. Around 6,000 worked there and their training school took apprentices from many other Mullard plants as well as from third party companies in the Blackburn area. Sad that it's all gone.

Andrew Mawson also worked for Mullard (I think at Southampton?).

As you say - it's a small world.

Cheers.

Phil.

awemawson:
Yes - Southampton back in the late 1960's for my sins. Actually I learnt an awful lot from my time there - I was in the infra red devices application lab working on early multi-element arrays used in spy satellites  :bugeye:

velocette:
Hi Speedi

480 to 15000 RPM will require some serious gearing down to work on a lathe.
Being a universal motor it should work through a "KB" speed controller  as John Rudd Suggested.
Be aware that any advice on working on mains powered equipment is at your own risk and responsibility.

Eric 

John Rudd:
Just to elaborate on my recommendation for the KB controller, there's nothing wrong with Piclocks design, its a speed controller for universal motors....
But, the KB design has added features, Soft start, current limiting/overload protection and motor load feedback...
All depends on how elaborate a design is needed..

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