Step angle Stepper Motor in 3D Printers Extruder Controller 3D Printer Extruder

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Step angle Stepper Motor in 3D Printers Extruder Controller 3D Printer Extruder

There are two common step angles: 0.9 and 1.8 degrees per full step, corresponding to 400 and 200 steps/revolution. Most 3D printers use 1.8 deg/step motors.

Aside from the obvious difference in step angle:

  • 0.9deg motors have slightly lower holding torque than similar 1.8deg motors from the same manufacturer
  • However, to produce a given torque, the lag angle needed by a 0.9deg motor is slightly more than half the lag angle of a similar 1.8deg motor. Or to put it another way, at small lag angles a 0.9deg motor has nearly twice as much torque as a 1.8deg motor for the same lag angle.
  • At a given rotation speed, a 0.9deg motor produces twice as much inductive back emf as a 1.8deg motor. So you generally need to use 24V power to achieve high speeds with 0.9deg motors.
  • 0.9deg motors need step pulses to be delivered to the drivers at twice the rate of 1.8deg motors. If you use high microstepping then the speed could be limited by the rate at which the electronics can generate step pulses. The interpolation mode at 16x microstepping of the TMC2660 drivers on the Duet 2 WiFi/Ethernet can be used to overcome this issue. The drivers on Duet 2 Maestro and Duet 3 can interpolate at any microstepping setting.

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