RAMPS on 24V

Working Doc

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Intro

• Simple - just cut off Arduino power, but need to feed Arduino with power in a different way. If using external heat bed mosfet - no other change needed. Still need to power through heat bed part with 12V - but that power is minimal.

http://www.mythoughtspot.com/2017/09/18/modify-ramps-for-24-volts/

https://reprap.org/wiki/RAMPS_24v

Do Stepper Motors Work Better at Higher Voltage?

• Steppers have less torque at higher speed
• Power of a stepper is constant - if power is torque x velocity, then torque decreases with higher velocity
• The mechanism for loss of torque is back EMF from inductance and back EMF from rotation
• With high velocity, back EMF of inductance is significant as a fraction of motor power. At high enough speed, inductance overtakes and motor stalls. This is the region when higher voltage allows stepper motor to overcome the effect of inductance. So at Max speed - higher voltage produces more torque for anstepper motor.

BOM

• 24V to 12V converter - 5A for using 12v heaters, fans - [1]
• $14 for 10A - [2]