Main reason is my motor speed control can only take up to 25v, I have not looked but I know a 24v ac transformer will produce close to 30v dc, I also already have the ps
I take the 25V limit is because the speed control is designed to be powered by 6 Lithium polymer cells
that can absorb any returned energy (unlike the 24V switch mode power supply)
if you protect the power supply with a diode
I expect the speed control will be at more risque unless you add a shunt stabiliser / returned energy dump across the speed controls supply terminals
without a circuit diagram or speed control board to study is impossible to tell how high a supply voltage the board can survive
unless the speed control came with detailed specifications
John
You are correct about the voltage limit. I do not have any detailed info on the speed control. It is rated at 80A and can handle 1 to 6 lipo cells
OK, in that case I'd add a simple voltage regulator circuit or would chose a transformer suitable for the purpose. You don't need to buy one with 24VAC secondary... 18VAC is pretty common. But sure, since you already have a PSU you might as well use that one until it lasts or you get tired of the fan noise, assuming it has a fan.
2 MOV's rated at 160 joules 36vdc
each and a large filter cap as his motor is pulling about 200w