Electrical Technology 2020-3-7
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True or False question: Please answer whether it is correct or incorrect. 3 points for a correct answer, 2 points for an incorrect answer, and 5 points for a detailed explanation of the reason. The rated speed of the four-pole three-phase induction motor is 1500 r/min.
Correct, 60*50/2=1500 revolutions per minute
Correct, the standard calculation gives 1500 revolutions per minute, but in reality this figure isn’t achievable due to some losses; the actual value for 4 poles should be around 1450 revolutions per minute.
Error: the synchronous speed is 1500 r/min, while the rotor speed is approximately 1470 r/min
The magnetic field rotation speed of a four-pole three-phase induction motor is 1500 r/min, while the rated rotation speed of an asynchronous induction motor is close to or less than 1500 r/min.