Motor Startup Current Calculator

Calculate Motor Startup Current







Formula

To calculate the Motor Startup Current (Isu):

\[ Isu = 4 \times \left( \frac{RP}{\sqrt{3} \times V \times PF \times E} \right) \]

Where:

What is Motor Startup Current?

The Motor Startup Current is the initial surge of current required to start a motor. It is typically much higher than the current required to keep the motor running. This current is essential for overcoming the inertia of the motor's rotor and the load it is driving.

Example Calculation

Let's assume the following values:

Using the formula:

\[ Isu = 4 \times \left( \frac{1000}{\sqrt{3} \times 230 \times 0.8 \times 0.9} \right) = 4 \times \left( \frac{1000}{286.659} \right) = 4 \times 3.49 = 13.96 \text{ amps} \]

The Motor Startup Current is 13.96 amps.