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Just need to find a variac now then.... Thanks for your advice, eBay here I come.

Hi, I need to power a series 90V DC motor, from a rectified AC supply. The terminal resistance of the motor is 3.6 ohms. I will use a bridge rectifier over the output of the AC supply, then smooth it. I have calculated I need a 5600uF smoothing capacitor over the bridge rectifier output ...

Also I believe 90v dc is a fairly typical voltage so it seems likely

No, the person I bought it off said he thought it was, and the person he bought it off ran it from 72v of car batteries. I think I'm going to try a rectified variac and wind it up slowly. I read somewhere you can run dc series motors on ac too? Sounds dodgy what with inductances etc but do you...

Result! Motor is not burnt out and run smoothly on 12VDC when wired in series! So... the next challenge is to find a suitable starter for it to run at full power... Any ideas for a cheap one? Thanks for all your help so far.

Thanks I'll let you know how I get on!

It would seem likely that it is a series wound motor then. I'll wire it back as such and put 12V through it. Guess this should give a good indication of success.... ??? Also any idea for an extremely economical way of getting a 90V dc source if this does work? Would rectifying and smoothing a...

Also what would be typical resistances for shunt and series motors?

Thanks but how can I be sure it's a shunt not a series motor? Generally is one more common?

Hi, I have brushed motor I need to get up and running but the only info I have on it is its DC 90V. I guess it's shunt wound as in the junction box there are 4 wires, BUT when I got it the junction box had been fiddled with and these 4 wires were wired to make a series configuration. I know...