What is the average AC induction motor life expectancy?

There are many factors that affect the life expectancy of an AC induction motor (or any electric motor). These factors can include input power problems, improper mechanical installations, malfunctions in the load, environmental factors, among others. Assuming that the motor is being operated under normal conditions, sized correctly for the application and within the manufacturer’s design requirements, it can last 15 years or more. 1 However, rewinding a motor usually is the result of a catastrophic failure in the motor’s insulation and windings and is usually due to a thermal breakdown. Hence, generally speaking, a motor that requires rewinding may not have been operated under normal conditions. Motors are frequently replaced rather than rewound due to costs, convenience and the claim that rewinding may reduce the motor’s efficiency. 2 Early failure of motor bearings is usually the result of improper mechanical installation causing undesirable forces acting on the bearings, or simply poor maintenance. Bearings should be inspected regularly for lubrication and uncharacteristic noises. Their life expectancy depends on factors previously cited. 3

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