Enter the motor torque constant (N-m/amp) and the total current (amps) into the calculator to determine the Stepper Motor Torque. 

Stepper Motor Torque Formula

The following formula is used to calculate the Stepper Motor Torque. 

Tsm = KT*i

  • Where Tsm is the Stepper Motor Torque (N-m)
  • KT is the motor torque constant (N-m/amp) 
  • i is the total current (amps) 

How to Calculate Stepper Motor Torque?

The following two example problems outline how to calculate the Stepper Motor Torque.

Example Problem #1:

  1. First, determine the motor torque constant (N-m/amp). In this example, the motor torque constant (N-m/amp) is measured to be 40.
  2. Next, determine the total current (amps). For this problem, the total current (amps) is calculated to be 100.
  3. Finally, calculate the Stepper Motor Torque using the formula above: 

Tsm = KT*i

Inserting the values from above and solving the equation with the imputed values gives: 

Tsm = 40*100 = 4000 (N-m)


Example Problem #2: 

Using the same process as example problem 1, we first define the variables outlined by the formula. In this case, the values are:

motor torque constant (N-m/amp) = 30

total current (amps) = 20

Entering these values yields:

Tsm = 30*20 = 600 (N-m)