How to Calculate Motor Torque?

How to calculate the torque needed for a motor?

Torque of a Motor Calculation

Torque is a the measure of the force tendency that allows the object to rotate. It can be represented as Ï„. Motor torque can be calculated using the current, voltage and efficiency of the motor. To calculate the motor torque, just follow the steps given below.

Formula
Ï„ (Motor Torque) = (I x V x E x 60) / (rpm x 2π)
I - Current
V- Voltage
E - Efficiency
RPM - Rotations per Minute
π (pi value) - 3.14

Step 1: Find the torque of the motor, whose Speed is 500rpm, Voltage is 9 Volt, Efficiency is 2% and Current is 0.50A.
Speed - 500rpm
Voltage (V) - 9 Volt
Efficiency (E) - 2% (i.e., 0.2)
Current (I) - 0.50A

Step 2: Substitute the values in the formula
Ï„ (Motor Torque) = (I x V x E x 60) / (rpm x 2π)
= (0.50 X 9 X 0.2 X 60 ) / (500 X 2 X 3.14)
= 54 / 3140
Ï„ = 0.01719n.m (newton meters)

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