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For a 50-Hz system, the formula would be: 50 x 60 x 2 = 6,000 no-load rpm ÷ number of poles. Using this formula, you can see that a four-pole motor operating on the bench under no-load conditions ...
Horsepower went back up to 350.3 at 5,500 rpm and torque climbed to 391.3 lb-ft at 4,000 rpm (at 13.7:1 AFR). Average torque was now up to 376.10 lb-ft and horsepower hit 302.41. Conclusion ...