What is the impact of frequent starting and stopping on motor lifespan?

Frequent starting and stopping of motors can have a considerable negative impact on their lifespan due to the increased mechanical and thermal stresses involved in each start-up cycle. When a motor starts, it draws a high inrush current, which can be several times greater than the normal operating current. This inrush current creates significant thermal stress on the windings, leading to increased wear and potential overheating.

Additionally, frequent cycling puts additional mechanical stress on components such as bearings, which can lead to premature wear and failure. This repeated strain can exacerbate issues such as vibration and misalignment, which further contribute to the deterioration of various motor parts. Over time, these factors cumulatively shorten the operational life of the motor, making it more likely to fail earlier than a motor that operates continuously within its rated conditions.

The other choices do not accurately reflect the realities of motor operation dynamics. The notion that frequent starts and stops would have no significant impact, or could increase lifespan, contradicts the common understanding of mechanical and electrical stress in motors. Immediate failure, while possible under extreme conditions, is not typically the result of mere frequent cycling; rather, it is a cumulative degradation that occurs over time due to the stresses mentioned.