Why is the current high when the motor start?

High starting amps of an electric motor can be several factors:

1.Low Back EMF at Startup – When the motor is stationary, there is no back electromotive force (EMF) to counteract the supply voltage, causing a surge of current.

2.High Inrush Current – The rotor’s inertia requires high torque to overcome, leading to a temporary spike in current.

3.Direct Online (DOL) Starting – Connecting the motor directly to full voltage without soft-start methods results in excessive initial current.

4.Low Impedance at Standstill – The motor windings have minimal impedance when not rotating, allowing high current flow.

5.High Load at Startup – Mechanical loads that require high starting torque increase current demand.

6.Voltage Supply Issues – Low supply voltage can cause higher current draw to meet power requirements.

Solve Methods:

• Use soft starters or variable frequency drives (VFDs).

• Implement star-delta starting to reduce initial voltage.

• Apply autotransformer starting for large motors.

• Ensure proper motor sizing to avoid excessive load mismatch.