What is the maximum percentage of full load current that DC motors are restricted to at starting?

DC motors typically have a starting current that can be significantly higher than their full load current due to the nature of their operation. When a DC motor starts, it is essentially a short circuit since the rotor is at rest and there is very little back EMF (Electromotive Force) generated during this initial phase. This results in a starting current that can be several times larger than the normal operating current.

The industry standard for the maximum starting current for DC motors is often specified at around 150% of the full load current. This means that when a DC motor is started, it should not draw more than 150% of the current it would normally draw at full load to prevent overheating and potential damage to the motor as well as connected electrical systems.

By adhering to this standard, the motor can perform effectively without compromising the integrity of its components or causing excessive stress on the power supply. Therefore, 150% is considered the safe maximum threshold for starting current in DC motors.