Driving a shunt motor at a fixed speed

The Dude · Nov 3, 2016

We are re-purposing a piece of used equipment we purchased (very cheap). It has a DC shunt motor, 115 volts, 1/50 HP (0.33 amps). The OEM power supply is bad (no DC output)and obsolete and it's also likely that we won't need variable speed. I'm trying to determine if I can power the motor at it's rated RPM (1725) with just a plain DC power supply (ideally 115 volts). I've checked Minarik, Automation Direct and they don't make anything less than about 1 AMP for a variable speed power supply. If I find a DC power supply at the rated voltage it looks like I can just wire up the shunt and windings off of the same voltage, is that correct?

Thanks,
The Dude

CalG · Nov 3, 2016

A single power supply is applicable.
plan to include a resistor to control field strength, Note that field weakening is used to INCREASE speed.

Best is a power supply with controls for both armature and field current

atomarc · Nov 3, 2016

Little SCR drives for that thing are so fricken cheap it hardly seems worth it to fiddle around with anything but a off the shelf drive. Just turn the speed to 'full' then remove the knob.

Stuart

The Dude · Nov 7, 2016

Thanks guys, appreciate the help. I agree with the "fricken cheap" part; we could easily be accused of being penny-wise & pound foolish. The only caveat on this one is that every drive I've found so far is overrated (again, nothing less than 1 AMP and we need 0.33 AMPS). Otherwise, I would've bought about the first thing I found.

Update: Called Minarik, they got me fixed up for about $200 through one of their distributors.

The Dude

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Driving a shunt motor at a fixed speed

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