Speed of Electrical Motors with operating Loads

The speed of operating electrical motors with loads, are lower than the motors synchronous speed (no load)

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

Related Topics

  • Electrical - Amps and electrical wiring, AWG - wire gauge, electrical formulas, motors and units

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