What happens to motor amperage when the motor starts?

When an electric motor starts, it goes through a phase where it draws a much higher current than its normal operating amperage. This phenomenon is known as inrush current, and it occurs because the motor needs to overcome its initial inertia and the starting torque that is required to get the rotor moving. As the motor accelerates and reaches its operational speed, the current drawn decreases to its rated operating level.

This initial spike in amperage is a critical factor to consider in HVAC applications, as it can impact circuit breakers, fuses, and the overall electrical system powering the motor. Understanding this characteristic of motor behavior is essential for effective troubleshooting and ensures proper system design, preventing potential overload conditions and ensuring reliable operation.