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Phone: +61 (0) 402 731 563 Fax: +61 (8) 9457 8642 Email: info@ Website: If you want to learn more about best practice machinery maintenance, or world class mechanical equipment maintenance and installation practices, follow the link to our Online Store and see the Training presentations and Books there… /store/machinery-maintenance-and- inspection/store-machinery-maintenance.html This document is a summary of recommendations against which to check... AC Electric Motors best practice Manufacturing Design/construction related features in ac motors that lead to longer service life and higher productivity [1] Engineers must select a proper motor that meets rms torque requirements. Oversized motors add inertia that must be started and stopped frequently. A properly selected winding increased the life of all other components. Motors designed for long life use bearing lubricants applicable to the machines operating temperature class. How can designers optimize service life and productivity when selecting and applying ac motors [1] If an application demands several starts and stops then the peak current must be considered due to heat generated in the windings. This heat must be removed from the motor through its surface, but amount dissipated depends on the ambient surroundings. Elevated temperatures can also be a reflection of the load to rotor inertia. One way to reduce this inertia mismatch is by adding ratio via a gearbox. Successful motor operation depends on defining application speed, torque, reflected inertia, and time. Motor efficiency standards [2] Many different energy efficiency standards for IMs are c