Suppose a prime mover rotates at a steady speed of 900 rpm at rated full load and rotates at a steady speed of 1000 rpm at no load. Assuming that no adjustments have been made to the governor speed control setting, what is the speed regulation of the prime mover expressed in percent?
ā¢ Speed regulation definition for a prime mover/governor system ā¢ Relationship between no-load speed, full-load speed, and rated speed ā¢ How to express a difference in speed as a percentage of a reference value
ā¢ Should speed regulation be based on the difference between no-load speed and full-load speed, or on something else? ā¢ Which speed (no-load, full-load, or an average) is typically used as the reference when calculating percent speed regulation? ā¢ Once you find the correct fraction, does multiplying by 100 give a number that looks more like a small regulation range or like the remaining percentage of rated speed?
ā¢ Write the mathematical formula for percent speed regulation using symbols first (e.g., N_noāload, N_fullāload), then plug in the numbers 1000 rpm and 900 rpm. ā¢ Be sure your numerator is the change in speed, not just one of the speeds alone. ā¢ Double-check whether the correct denominator is the full-load speed or the no-load speed according to how speed regulation is defined in your engineering reference.
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