Power Supply for stepper

Take one coil, attach a bridge rectifier, a capacitor, and run a buck SMPS off it?

Thank you for your prompt reply. However, since I am just an in-home shop tinkerer, I did not understand "buck SMPS". After hours of research I realize this is beyond my abilities to design with any possibility of it working. If possible could you or someone supply a schematic with component listing.

Alas, it's probably not really possible. At this sort of power level (800W), there are a number of things in the construction, heatsinking, ... that have to be just right.

Not to mention that if you don't understand what you're doing the schematic needs to have all the 'obvious' things spelled out that may not be normally present.

What sort of electronics projects hgave you done, htere may be other ways.

Hi, Ben. The easiest solution for a "tinkerer" would be to use a rectifier and filter capacitor to get around 60VDC, then use a resistive current limiter to keep the coil current to spec.

L-R drive has the advantage of getting somewhat more torque at higher speeds, at the obvious cost of wasting a lot of power through heat.

See Jones on Steppers:

particularly Section 4: Current Limiting for more information on this and other methods to accomplish what you want. See particularly Fig.

If you're looking for an inexpensive source of surplus power resistors, you could do worse than Surplus Sales of Nebraska.

Be careful, and don't forget the diodes!

Good luck Chris

Ian, How about a modest step-down transformer in front of the thing, allowing a simple full-wave bridge + filter cap? Might there be a suitable tapped transformer, such as for line voltage conditioning?

Regards, James Arthur