energy-efficient_electric_motor_selection_handbook

Efficient use of energy enables commercial and industrial facilities to minimize production costs, increase profits, and stay competitive. The majority of electrical energy consumed in most industrial facilities is used to run electric motors. Energy-efficient motors now available are typically from 2 to 6 percent more ef-ficient than their standard motor counterparts. This efficiency improvement translates into substantial energy and dollar savings. For instance, a recent study of Northwest industrial sector energy conservation measures revealed a potential for 52.7 MWa of energy savings by replacing standard motors with high-efficiency motors. This savings is annually valued at $13.8 million given an electricity price of only $0.03/kWh (see Chapter 5).


The price premium for an energy-efficient motor is typically 15 to 30 percent above the cost of a standard motor. Over a typical lo-year operating life, a motor can easily consume electricity valued at over 57 times its initial purchase price. This means that when you spend $1,600 to purchase a motor, you are obligating yourself to purchase over $92,000 worth of electrical energy to operate it. A price premium of $400 is negligible compared to saving 3 percent of $92,000 or $2,760. Purchasing new or replacement energy-efficient motors makes good economic sense (see Chapter 5).


Energy-efficient motors are truly premium motors. The efficiency gains are obtained through the use of refined design, better materials, and improved construction. Many motor manufacturers offer an extended warranty for their premium-efficiency motor lines. Yet only 15 percent of motor sales nationwide are of high-efficiency units. Because of our low-cost electricity, this percentage is undoubtedly even lower in the Northwest region.


Durable and reliable energy-efficient motors can be extremely cost effective with simple paybacks on investment of less than 2 years-even in the Northwest. Energy efficient motors should be considered in the following instances. • For new facilities or when modifications are made to existing installations or processes • When procuring equipment packages • Instead of rewinding failed motors • To replace oversized and underloaded motors • As part of an energy management or preventative maintenance program • When utility rebates am offered that make high-efficiency motor retrofits even more cost effective

This Energy-Efficient Electric Motor Selection Handbook (Handbook) shows you how to assess energy savings and cost effectiveness when making motor purchase decisions.

The Handbook also discusses high-efficiency motor speed characteristics, performance under part-load conditions, and operation with an abnormal power supply.Additionally, the Handbook tells you where further information is available. For example, you can obtain performance and price data for both standard and energy efficient motors from the Electric Ideas Clearinghouse 1-800-872-3568, or 206-586-8588 outside of BPA’s service area. Finally, the Handbook contains a motor test data
sheet (Appendix A) and a list of Northwest motor manufacturers’ representatives (Appendix B).

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