What is the consequence of a motor operating at locked-rotor current (LRC)?

When a motor operates at locked-rotor current (LRC), it draws a significantly higher current than it normally would when running under full load or at normal operating conditions. This situation occurs when the rotor is not moving, which typically happens during the starting phase of the motor.

The high current associated with LRC can lead to excessive heat generation within the motor windings. If the motor operates at this current level for an extended period, the heat can cause insulation breakdown, leading to short circuits and ultimately burning out the windings. This is why understanding and managing LRC is critical in motor applications. Preventing prolonged operation under locked-rotor conditions is essential for maintaining the health and longevity of the motor.

Thus, the consequence of a motor operating at locked-rotor current, when considering the context of electrical theory and motor design, significantly correlates to the risk of burning out the windings due to heat buildup.