Test & Measurement

Tip of the Week: Motor Maintenance

Jan. 26, 2015

Tips to keep your motors running smoothly

Heat is the number one enemy of motor longevity. Conducting regular thermal surveys on motors is a good way to spot lubrication problems, impending bearing failure, and even such things as voltage imbalance.

Be sure to also take thermal readings on gearboxes. Problems such as misalignment or dirty gear oil show produce increased temperatures. These problems increase the load on the motor and how much current it must draw; that means greater heat in the windings and a shorter life for the motor. Some gearbox problems can result in uneven bearing loading in the motor, and that also shortens motor life.

The readings might not make sense in isolation. If the gearbox reads 90°F and the motor thrust bearing reads 110°F, is that bad? Yes, if the baseline readings were 80°F and 98°F, respectively. But not if the baseline readings were about the same.

About the Author

Mark Lamendola

Mark is an expert in maintenance management, having racked up an impressive track record during his time working in the field. He also has extensive knowledge of, and practical expertise with, the National Electrical Code (NEC). Through his consulting business, he provides articles and training materials on electrical topics, specializing in making difficult subjects easy to understand and focusing on the practical aspects of electrical work.

Prior to starting his own business, Mark served as the Technical Editor on EC&M for six years, worked three years in nuclear maintenance, six years as a contract project engineer/project manager, three years as a systems engineer, and three years in plant maintenance management.

Mark earned an AAS degree from Rock Valley College, a BSEET from Columbia Pacific University, and an MBA from Lake Erie College. He’s also completed several related certifications over the years and even was formerly licensed as a Master Electrician. He is a Senior Member of the IEEE and past Chairman of the Kansas City Chapters of both the IEEE and the IEEE Computer Society. Mark also served as the program director for, a board member of, and webmaster of, the Midwest Chapter of the 7x24 Exchange. He has also held memberships with the following organizations: NETA, NFPA, International Association of Webmasters, and Institute of Certified Professional Managers.