Originally Posted by andsetinn
If the SMPS can deliver enough "clean" (steady voltage) amps it shouldn't be a problem to run motor or ESC from it. If the output is "dirty" (choppy voltage) it might kill your ESC.
Since the ESC is switching the motor (big load) on and off at high frequency, the ESC might kill your SMPS. Check manufacturers specs.
Ideally you'd get Oscilloscope and monitor the voltage from the SMPS at load to see if it's safe.
Adjustable voltage SMPS are usually too low amperes to run motors from.
My power supply is rated at 30Amps continuous, which I think should be enough for low power motors under no load. You stated that the ESC's switching may kill the SMPS. What would remedy this? Could a large capacitor smooth out the on/off load? What if I run the motor directly off of the power supply? Would this be unsafe? Why? Is it the back EMF?