Building a power supply

[WilliamD]

Where is a good comprehensive, as much of a step by step process available, for building a power supply? I want to build one big enough to power a treadmill motor, I think 100W at 20 amps. Any info or directions would be greatly appreciated!

[Al_The_Man]

There are many links here as well as a web search for linear power supply building, a 100w providing 20 amps requires only a 5v supply??
You need to get the full specs. on the motor before starting, to find out the DC requirements of the DC supply.
Look on the Plitron site for starters for general design.
Al.

[WilliamD]

Whoops, I didn't write that down right. I'm looking for a power supply to power the treadmill motor on Surpluscenter.com for my spindle. I think it's 100 volts, and 20 amps. It will obviously have to convert AC to DC also. I tried searching on the forum, but I must not be putting in the right search criteria. Thanks for the reply though.

[Al_The_Man]

The basics you will need a transformer like this http://cgi.ebay.com/62-62-17-17V-100...QQcmdZViewItem
This could be run with the 62v paralleled and the 17v paralleled and then both paralled sets in series to give you just over 100vdc.
You then need a 40amp bridge rectifier and a 10,000µfd capacitor will give you a 5% ripple at 20amps. The transformer winding on the toroid can be easily adjusted by taking turns off if neccessary.
Al.

[pminmo]

Typically a treadmill motor is run from rectified and chopped A/C. Here is one that surpluscenter sells http://surpluscenter.com/item.asp?UI...tname=electric

But if you need 20A it won't do it.

[WilliamD]

Thanks for the replies! I looked at the motor again and the max is 18 amp. I don't even have a breaker that big, so I think I'll stick to the max of that VFD on surplus. Thanks again!