Consider a dc motor with armature voltage = 125 v and armature resistance = 0.4 ohm. It is running at 1800 rpm under no load condition. The rated armature current is 30
a. Calculate the rated speed of the motor.
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The mathematical formula to remember in helping make this calculation is the number of cycles (Hz) times 60 (for seconds in a minute) times two (for the positive and negative pulses in the cycle) divided by the number of poles. Therefore, for a 60-Hz system, the formula would be: 60 x 60 x 2 = 7,200 no-load rpm Ã
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