Extending Motor Life: Expert Maintenance Tips

What Can Be Done to Help Increase the Life of a Motor?

To extend a motor’s lifespan, conduct routine inspections and maintain cleanliness. Keep ventilation openings free from dust, dirt, and debris. When lubrication is required, apply the manufacturer’s recommended amount—over‑greasing can impair motor performance.

Why is Maximum Ambient Temperature Important?

Operating a motor above its maximum ambient temperature risks overheating and premature failure. The limit is specified in degrees Celsius and indicates the highest temperature at which the motor can run continuously at its rated horsepower and service factor. While the NEMA standard sets this value at 40 °C (≈110 °F), always verify the rating on the motor nameplate for any deviations.

What to Consider When Fitting a NEMA Premium® Motor to Your Application

When selecting a NEMA Premium motor, several factors influence performance:

• Higher efficiency reduces slip, raising the motor shaft speed. If you need the same output, you may need to adjust the driven equipment.
• Check the KVA code letter to match the motor starter size.
• For optimal efficiency, run the motor at 75–100 % of its rated load.

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How Can Excessive Corrosion Be Avoided?

While some corrosion is inevitable in humid environments, excessive corrosion—especially on bearings, shaft journals, or between rotor and stator—can lead to early failure. Mitigate it with these practices:

• Apply a rust‑preventive coating during regular maintenance.
• Rotate the motor shaft monthly when the unit is idle.
• Use space heaters or a trickle‑voltage system to eliminate condensation.

Information sourced from the PTDA website. These Tech Tips provide general guidance based on PTDA members’ experience but are not exhaustive. PTDA and its contributors disclaim warranties and liability for the accuracy or applicability of the information.