Motor modules for older machines with brush type motors

[hotpoint95622]

<span style="font-size: small;">I have expanded my basic electronics over the winter months and started work on speed modules, I hope this proto type can be further refined so it can be used to replace faulty modules on some of the vintage Hotpoint front loaders with mechanical timers and perhaps some Hoover machines as well, I’m also working on a module to fit in my project machine so that it has all my own PCB’s.</span>

 

[hotpoint95622]

Video

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[hotpoint95622]

Motor modules for older machines with brush type motors

Photo

 

[chestermikeuk]

Speed Controllers

Nice one Lee, good to see the patience paying off!!! I think we are all ready for spring now to get back into the garages & start playing!!!

What was the spin speed 400rpm?? and is it hooked up to your monitor so you can see the commands & actions??

Happy tinkering, Mike

 

[hotpoint95622]

hotpoint 95622

How do Mike
Speed is approximately 450rpm I haven’t tried the 1000rpm as the armature is likely to self destruct with no load on the motor.
It’s not hooked up to the computer; I’m using an industry standard chip which I happened to come across on the net when looking for something completely different.
Many manufactures seem to use this chip (TDA1085C) in some lower end machines, it doses all the work, and all I have had to work out is interfacing it with the outside world so to speak. Basically the chip reads the tacho voltage and then match it to the speed input voltage though some resistors. Change the resistance up or down for slower or faster.
It’s some thing I have been looking into for some time just in case I have to make my own for the old Hotpoint’s I have, hopefully I wont need to but you never now.

I’m desperate for some nice warmer weather so I can finish the restoration of the Liberator 1851/03 off.

Lee

 

[hotpoint95622]

hotpoint 95622

Data Sheet for the chip at first this was just too much for me to work out, and then I found a module in my spares with the very same chip in from a zanussi machine I broke up some time ago, so I studied if and pondered for some time, thin it just all fell into place.

Link to the data sheet.

http://www.onsemi.com/pub_link/Collateral/TDA1085C-D.PDF