How are stepper motors rated?
Stepper motors come with a nameplate current rating, winding resistance, output torque and voltage rating. The voltage ‘rating’ of the motor is simply derived from the motor’s rated current and winding resistance. An example motor shown above is rated for 5 [A] (per winding), with a winding resistance of . 5 [Ω].
What is stepper motor rated voltage?
Stepper motors have a rated voltage and current. A typical stepper motor like our NEMA 17 might have a rated voltage of 2.8 Volts and a maximum current of 1.68 Amps. This basically means if you hook it up to 2.8 Volts it will draw 1.68 Amps.
What’s the best current rating for a stepper motor?
“Peak” current ratings are not applicable to stepper motors. Always go by the “continuous” current rating. You will also need to know the electrical specifications for the motor. There are 2 critical parameters: Amps per phase – This is the maximum current that the motor windings can handle without overheating.
What happens if you mismatch the driver on a stepper?
Mismatched motors and drivers can result in disappointing performance. Or worse: damage to the motor and/or controller. Voltage – The maximum voltage that the driver can supply to the motor. Continuous Current – The maximum current that the driver can supply to the motor. “Peak” current ratings are not applicable to stepper motors.
How does a stepper motor react to current?
Stepper motor phases are inductors, so they will resist rapid changes in current flow. But at the end of each step or when not moving, they behave like a purely resistive load and will behave according to Ohm’s Law.
Can a stepper be used with a constant voltage driver?
But some motors have very low coil resistance. Strictly following those formulas, the drive voltage will be less than 5v and performance will not be good. This type of motor is not a good match for a constant-voltage driver. These steppers require a more specialized controller.