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Automatic Washer - The world's coolest Washing Machines, Dryers and Dishwashers

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hotpoint 95622

Wow that is a motor, compared to my commuter motor, sort of makes it look small.

I’m currently working on a proper printed circuit board complete with new chip (PIC 16F77), with new programs and hopefully a time line to show progress of the wash cycle. Need to build a light box to photo develop circuit design onto copper clad board, I tried some iron on transfer sheets but have been unsuccessful. Also milling over a jog switch instead of push switches. If I can get the developing to working I will make one of each board which can be inter changed.

hotpoint95622++8-13-2009-09-35-43.jpg
 
Hotpoint 95622, your board layout looks very detailed. I ran across site with some info that may help you make your circuit board, when I find the site I will email it to you.

I chose a motor this big because I want to get the extract speed of the machine to at least 1000 rpm. The old motor was 3/4 hp with speeds of 330 rpm and 3350 rpm, also with 3in. diameter double pulley.This motor was also open at the ends, so if water leaked into it from sitting just below the drum gasket, you would be spending $1300 for a new one(happens very often in these machines). At 3350 rpm, the extraction speed was 525 rpm. What that means is that in order to get to 1000 rpm, I have to change the pulley ratio. The pulley on the cylinder shaft is proprietary, so it is easier to just use a bigger pulley on the motor. When a bigger pulley is used on the motor and the other pulley is the same, more strength is required to turn the cylinder, but the cylinder will turn faster. I was thinking that 3 HP at 3520 rpm will be more than enough and I will not have to overdrive the motor to get 1000 rpm. Also this motor is TEFC and rated for hazardous conditions, so water won"t be an issue as long as I use the right insulation and connectors from the junction box. The next steps are to find a big pulley(maybe 7" or 8" diameter) and a VFD to control the motor. But I have to say it again: "That's one heck of a motor!!!!".

Please keep your thoughts and suggestions coming.
 
A quick check on parts:

I currently have the solid state relays(ssr), the motor, pulley, control box, user interface panel, SS disconnect.

Now I need to finish getting the cards for my PLC, the VFD, bus bars, and I need to design a mounting bracket for the motor. Then I can start putting more things together.

What do you guys and gals think?

supremewhirlpol++8-19-2009-19-14-12.jpg
 
hotpoint 95622

Good progress your making.

I have just spent more money I DON’T HAVE, what the hell, what do you have a master card for, now the owner of a UV photo light box so will try to process a PCB this weekend, fingers crossed it works for me.
 
Hotpoint 95622,

Have you considered taking your PCB design to a company that custom makes boards? It may cost you a good amount of money to have it done. Have you tested your setup with the new chip and updated program?

Volvoguy87,
I think when I complete the programming structure for extraction on the PLC, I will put up a video of the machine spinning at full RPM's. But that may take a while. School starts Monday, so this project may be set a side until next summer.
 
hotpoint 95622

Yes I have also had some costing for one-off production of a board; average of £70 so will persevere with making my own. I have 4 designs in my head at the moment and can’t decide which one to go with. I will take photos of the stages of production, even my many mistakes which will happen I am sure.
 
hotpoint 95622...

Yes, I'd like to see the pictures. Good luck on your board designs. How much time have you dedicated to this project so far?
 
hotpoint 95622

How long about 14 months, as I have had to learn all about electronic from books then read up about microcontrollers. How much have I spent, about £200 plus, most expensive part was the motor which was £90, cheapest the scrap machine £0.00.

Photo of first attempt with the transfer film.

hotpoint95622++8-22-2009-09-16-3.jpg
 

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