Chuck Yung is a senior technical support specialist at EASA, St. Louis, MO; www.easa.com. EASA is an international trade association of more than 1800 electromechanical sales, service and repair firms in nearly 80 countries.
Saltwater becomes a major problem.
They can’t all be right, yet many of us may have used one of these rules (probably not the same one, either) with great success. Which one, if any, is correct? The answer depends on the application.
Whether it's an old or new design, the process of lowering motor temperatures is based on same principles.
A rudimentary understanding of how shaft sizes are determined can be helpful to anyone who works with pumps, fans, elevators or any other motor-driven equipment. Engineers often design using an ample safety factor, but consider modifying a shaft only with good engineering support. The greater the consequence of failure, the more generous the safety factor should be.
Oversized motors cost more to operate—sometimes a lot more. Fortunately, there’s a simple procedure for determining the actual hp required by a load, without expensive equipment or engineering.
In the wake of the natural disasters, maintenance professionals and motor repairers need creative solutions to speed the removal of moisture and contamination from thousands of swamped motors.
Two mistaken ideas about how to dry wet windings have persisted for years. One is that heating the windings with a welding machine is good way to dry out an electric motor. The other is that windings should not be dried at oven temperatures above 180 F.