TABLE OF CONTENTS Table 1 from the GPSA Engineering Data Book1 compares standard and high efficiency motors. Table 2 from GPSA compares synchronous and induction motors. Table 3 from Evans2 shows the effect of a large range of speeds on efficiency.
| HP | Approx. Full Load RPM | Amperes Based on 460V | Efficiency in Percentage at Full Load | ||
|---|---|---|---|---|---|
| Standard Efficiency | High Efficiency | Standard Efficiency | High Efficiency | ||
| 1 | 1,800 | 1.9 | 1.5 | 72.0 | 84.0 |
| 1,200 | 2.0 | 2.0 | 68.0 | 78.5 | |
| 1 | 1,800 | 2.5 | 2.2 | 75.5 | 84.0 |
| 1,200 | 2.8 | 2.6 | 72.0 | 84.0 | |
| 2 | 1,800 | 2.9 | 3.0 | 75.5 | 84.0 |
| 1,200 | 3.5 | 3.2 | 75.5 | 84.0 | |
| 3 | 1,800 | 4.7 | 3.9 | 75.5 | 87.5 |
| 1,200 | 5.1 | 4.8 | 75.5 | 86.5 | |
| 5 | 1,800 | 7.1 | 6.3 | 78.5 | 89.5 |
| 1,200 | 7.6 | 7.4 | 78.5 | 87.5 | |
| 7 | 1,800 | 9.7 | 9.4 | 84.0 | 90.2 |
| 1,200 | 10.5 | 9.9 | 81.5 | 89.5 | |
| 10 | 1,800 | 12.7 | 12.4 | 86.5 | 91.0 |
| 1,200 | 13.4 | 13.9 | 84.0 | 89.5 | |
| 15 | 1,800 | 18.8 | 18.6 | 86.5 | 91.0 |
| 1,200 | 19.7 | 19.0 | 84.0 | 89.5 | |
| 20 | 1,800 | 24.4 | 25.0 | 86.5 | 91.0 |
| 1,200 | 25.0 | 24.9 | 86.5 | 90.2 | |
| 25 | 1,800 | 31.2 | 29.5 | 88.5 | 91.7 |
| 1,200 | 29.2 | 29.1 | 88.5 | 91.0 | |
| 30 | 1,800 | 36.2 | 35.9 | 88.5 | 93.0 |
| 1,200 | 34.8 | 34.5 | 88.5 | 91.0 | |
| 40 | 1,800 | 48.9 | 47.8 | 88.5 | 93.0 |
| 1,200 | 46.0 | 46.2 | 90.2 | 92.4 | |
| 50 | 1,800 | 59.3 | 57.7 | 90.2 | 93.6 |
| 1,200 | 58.1 | 58.0 | 90.2 | 91.7 | |
| 60 | 1,800 | 71.6 | 68.8 | 90.2 | 93.6 |
| 1,200 | 68.5 | 69.6 | 90.2 | 93.0 | |
| 75 | 1,800 | 92.5 | 85.3 | 90.2 | 93.6 |
| 1,200 |
