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Preface | ||
1 | Induction Motor Characteristics | 1 |
1.1 | Three-Phase Induction Motors | 1 |
1.2 | Single-Phase Induction Motors | 15 |
2 | Energy-Efficient Motors | 33 |
2.1 | Standard Motor Efficiency | 33 |
2.2 | Why More Efficient Motors? | 36 |
2.3 | What Is Efficiency? | 36 |
2.4 | What Is an Energy-Efficient Motor? | 45 |
2.5 | Efficiency Determination | 52 |
2.6 | Motor Efficiency Labeling | 57 |
2.7 | NEMA Energy-Efficient Motor Standards | 61 |
3 | Electric Power Costs | 65 |
3.1 | Industry Energy Trends | 65 |
3.2 | Electric Power Cost Trends | 67 |
3.3 | Electric Utility Rates | 68 |
3.4 | Summary | 76 |
4 | The Power Factor | 79 |
4.1 | What Is the Power Factor? | 79 |
4.2 | The Power Factor in Sinusoidal Systems | 80 |
4.3 | Why Raise the Power Factor? | 82 |
4.4 | How to Improve the Power Factor | 84 |
4.5 | The Power Factor with Nonlinear Loads | 98 |
4.6 | Harmonics and the Power Factor | 102 |
4.7 | Power Factor Motor Controllers | 110 |
5 | Application of Electric Motors | 117 |
5.1 | General Discussion | 117 |
5.2 | Varying Duty Applications | 125 |
5.3 | Voltage Variation | 127 |
5.4 | Voltage Unbalance | 128 |
5.5 | Overmotoring | 139 |
5.6 | Polyphase Induction Motors Supplied by Adjustable-Frequency Power Supplies | 140 |
6 | Induction Motors and Adjustable-Speed Drive Systems | 157 |
6.1 | Energy Conservation | 157 |
6.2 | Adjustable-Speed Systems | 160 |
6.3 | Application of Adjustable-Speed Systems to Fans | 221 |
6.4 | Application of Adjustable-Speed Systems to Pumps | 230 |
6.5 | Application of Adjustable-Speed Systems to Constant-Torque Loads | 237 |
7 | Economics of Energy-Efficient Motors and Systems | 241 |
7.1 | General Review | 241 |
7.2 | Life Cycle | 243 |
7.3 | Direct Savings and Payback Analysis | 245 |
7.4 | Efficiency Factor or Efficiency Evaluation Factor | 250 |
7.5 | Present Value or Present Worth Method with Constant Power Costs | 254 |
7.6 | Present Value or Present Worth Method with Increasing Power Costs | 255 |
7.7 | Net Present Worth Method | 258 |
Selected Readings | 263 | |
Index | 269 |
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