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Electrical Motors - Speed at Operating vs. Synchronous Load

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Synchronous and approximate speed (rpm) at rated load for small and medium motors operating at 60 hz and 50 hz:

Electrical Motors - Speed at Operating vs. Synchronous Load

No. Poles
Approximate Electrical Motor Speed (rpm)
Speed with Rated LoadSynchronous Speed (no Load)
60 hz50 hz60 hz50 hz
2 3450 2850 3600 3000
4 1725 1425 1800 1500
6 1140 950 1200 1000
8 850 700 900 750
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