Question
Download Solution PDFA 3-phase induction motor runs at 1500 rpm at no load and 750 rpm at full load when connected to 60 Hz 3-phase line. Calculate the number of poles the motor has :
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe correct answer is option 2): 4
Concept:
The synchronous speed of the machine is Ns
Ns = \(120 \times f \over P\)
where
f is the frequency in Hz
P is the number of poles
Calculation:
f = 60 Hz
Ns = 1500 RPM
P = \(120 \times f \over N_s\)
= \(120 \times 60 \over 1500\)
= 4.8 ~ 4 poles
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