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Engineering ToolBox > Speed of Electrical Motors with operating Loads
The approximate speed (RPM) at rated loads for small and medium motors operating at 60 hz and 50 hz at rated volts can be found in the table below:
| Approximate Electrical Motor Speed (RPM) | ||||
| No. Poles | Speed with Rated Load | Synchronous Speed (no Load) | ||
| 60 hz | 50 hz | 60 hz | 50 hz | |
| 2 Pole | 3450 | 2850 | 3600 | 3000 |
| 4 Pole | 1725 | 1425 | 1800 | 1500 |
| 6 Pole | 1140 | 950 | 1200 | 1000 |
| 8 Pole | 850 | 700 | 900 | 750 |