Convert between motor power, speed and torque, and check starting torque.
Torque is power divided by angular velocity, so a low-speed motor produces far more torque for the same power. That is why gearboxes trade speed for torque rather than creating either. Starting torque must exceed the load’s breakaway torque or the motor will stall, which is the first check in any drive selection.
Motor Torque
T = P ÷ ω, with ω = 2π n ÷ 60
T = P ÷ ω, with ω = 2π n ÷ 60 Torque is power divided by angular velocity, so a low-speed motor produces far more torque for the same power. That is why gearboxes trade speed for torque rather than creating either.
Starting torque must exceed the load’s breakaway torque or the motor will stall, which is the first check in any drive selection.
This calculator takes 3 inputs: Motor power, Shaft speed, Starting torque multiple. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.