A6 pole induction motor is working on three phase 50 Hz AC supply at no load and at full load. When it runs at no load it has slip of 6% and when runs at full load then slip is 5%. By considering these conditions solve the following: determine speed of induction motor.
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In a 3-phase induction motor, the synchronous speed & slip can be calculated as
Ns = 120f/P
f is frequency
s = (Ns-Nr)/Ns
Nr = Ns (1 – s)
Where, Ns = Synchronous speed in rpm,
Nr = Rotor speed in rpm,
s = Slip of the machine,
f = Supply frequency in Hz,
P = Number of poles
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