Stepper Motor Performance

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  • The higher the voltage - the more torque a motor will have [1]:

Steppers-v.jpg

  • Ramifications of voltage - one can get higher performance by running at higher voltage. Higher voltage means less current for the same power - so it appears motors run cooler at higher voltage for the same performance.
  • The higher the current - the more torque (T): Torque is proportional to current[2].
  • Why does a motor have less torque at higher speed? The motor acts as a generator, producing back EMF, reducing the applied voltage. A motor in motion must also overcome inductance of the windings.

References