BUYING AN ENERGY-EFFICIENT ELECTRIC MOTOR (1)

Efficiency is an important factor to consider when buying or rewinding an electric motor. This fact sheet shows you how to obtain the most efficient motor at the lowest price and avoid common problems. It answers the following frequently asked questions:

1. Why is improving motor efficiency important?
2. What is an energy-efficient motor?
3. What efficiency values should I use when comparing motors?
4. When should I consider buying an energy-efficient motor?
5. When is an energy-efficient motor cost effective?
6. Should I rewind a failed motor?
7. What design factors should I consider when choosing a new motor?
8. How should I begin a motor efficiency improvement program?
9. How can I obtain motor prices and efficiency values?
10. Where can I find additional information?

1. Why is improving motor efficiency important?
Over half of all electrical energy consumed in the United States is used by electric motors. Improving the efficiency of electric motors and the equipment they drive can save energy, reduce operating costs, and improve our nation’s productivity.
Energy efficiency should be a major consideration when you purchase or rewind a motor. The annual energy cost of running a motor is usually many times greater than its initial purchase price. For example, even at the relatively low energy rate of $0.04/kWh, a typical 20-horsepower (hp) continuously running motor uses almost $6,000 worth of electricity annually, about six times its initial purchase price.

to be continued...........

Source : Fact Sheet - US Department of Energy

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