Energy-Efficient Electric Motor Selection Handbook
1. Introduction
When to buy energy-efficient motors
Industrial motor population and uses
Annual electric motor sales
2. Energy-Efficient Motor Performance and Price
Motor Losses and Loss Reduction Techniques
Determining and Comparing Motor Efficiencies
Motor Efficient Testing Standards
Testing Equipment Accuracy Limitations
NEMA Motor Nameplate Labeling Standards
3. How Much Can You Save?
Understanding your Utility’s Rate Schedule
Determining Load Factor
Determining Operating Hours
Determining Annual Energy Savings
Motor Purchase Prices
Assessing Economic Feasibility
Recommendations for Motor Purchases
4. Obtaining Motor Efficiency Data
5. Energy-Efficient Motor Selection Guidelines
Initial Motor Purchases
Motor Failure and Rewind Scenario
Replacement of Operable Standard-Efficiency Motors
Oversized and Under load Motors
6. Speed, Design Voltage, Enclosure,
Part-load Efficiency, and Power Factor
Sensitivity of Efficiency Gains to Motor RPM
Operating Voltage on Motor Performance
Motor Speed and Enclosure Considerations
Efficiency Improvements at Part-Load Conditions
Power Factor Improvement
7. Motor Operation Under Abnormal Conditions
Over Voltage
Under Voltage
Phase Voltage Imbalance
Load Shedding
8. Motor Selection Considerations
Motor Enclosures
Motor Insulation Systems
Service Factor
Motor Speed, Slip, and Torque Characteristics
9. Additional Benefits of Energy-Efficient Motors
10. Starting Your Motor Improvement Program
11. Energy-Efficient Motors: Twenty Questions and Answers
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