I suspect running machines aren't toooooo popular on here!

I would connect the motor to a car battery and see if it does anything,should go slowly.

What machine did it come from, this might gives clues to the controller ?

It won't be 250 vdc it'll be circa 110 vdc as it's half wave.

You can get power supplies from Banggood and other reputable chinesium suppliers.

These treadmills often need the display board to function properly, at the very least there will be a speed sensor that needs to be triggered to allow the power to be applied, no rotation sensed, no go.

The power supplies I mentioned have a speed pot on them so that they will vary the speed.

Without seeing the rest of the electrics as they were it's difficult to say yay or nay.

Normally there would be a display board which sits between the 2 handles and has a failsafe key and then one or two boards down the front. if there were two boards and you have the correct one it could work, if there was only one board then you probably need the display as well.

It would be worth trawling through youtube videos on treadmill motors as they are popular for converting to 1 x 72" belt grinders.

This one from Banggood is what I bought – AC90V-260V Input DC110V Output 8A PWM DC Motor Speed Controller Driver Speed Governor. Currently at £42

**LINK**

search on youtube for "treadmill motor conversion", that will keep you occupied for a bit. What ever you do don't dump it as they are a very popular motor.

Sean, I beg to differ on the operating voltage of the motor….

Why would any decent manufacturer run a 250 v dc motor on 110v?

The more info/pictures you can supply on the pcb, the better advice you will get befote spending your hard earned cash on another controller…

I daresay, BigClive would ask the same questions…. ( I'm not questioning his technical expertise…)

I have a similar freebie. I have a 3HP DC motor from a scrapped York treadmill. The controller was failed, and not thought economic to replace (excuse for new, bigger treadmill). It requires 180VDC which doesn't seem to align with any type of rectified 250VAC mains. I appreciate that a switched mode supply could run it, although nowhere near 100% 'on' ratio, close to 50% (340V peak, 680V peak-peak?).

I tried it on a 20VDC power supply, and it ran slowly with reasonable torque (like Maurice's test above). Is there a logic to the full speed voltage? Is half the waveform thrown away, then the voltage is chopped, or am I missing something?

Bill

Bill,

The purpose of the control baord is to take AC mains, convert it to DC and supply it to the motor. I'm sure you appreciate that thus far.

One way of supplying said juice to the motor is via a Thyristor bridge controlled with appropriate circuitry, this will pulse the voltage to the motor, so that at max beans, the motor only sees 180Volts….Another method is to use a FET(s) in a pwm controlled circuit…..

Sean, my comments apply to  your motor…., these control methodologies are adopted by the various manufacturers of the mini mill/lathe….Sieg have used both as an example..

Edited By John Rudd on 29/12/2018 21:02:14

A further example is the Warco lathes that use a dc motor…Commonly used boards made by KB or the Chinese versions rated at 6-12 Amps with a 0-180vdc output.

Sean , it would appear to me that you have little experience with mains powered electrical or electronic items so i would suggest you leave it alone until you can get some help from someone who does .

Your controller may just be a simple ac to dc converter and pwm controller but i can't work out what the black lead does . The red ones are probably power but can't be sure . You don't know yet if the controller even works and it could be dangerous to power it up .

I would look around on some various sites like ebay or bangood for a pwm controller that can handle the power requirements of the motor and buy one of them .