Don't pay any attention to the nameplate voltage on your stepper motor; that has little or no relationship to the voltage you actually supply it with. The inductance of the motor is what you need to focus on when calculating the power requirement. So on that motor, you look it up on this chart: https://gzslmotor.en.alibaba.com/pro...ter_motor.html

It seems that the inductance is 3.2mH (which is quite high for a small motor like that). Using the formula: square root of the inductance times 32, you get an optimal supply voltage of 57.24v. That's what it needs to run at top speed. (The nameplate amperage is correct, though - it really wants to be able to draw 1.68 amps.). I'd say replace that motor with one that has a lot less inductance, so you can supply the right amount of voltage without blowing up your drivers. Look for one that has .6mH or less if you want to use that 24v supply.

Andrew Werby
www.computersculpture.com