Q2 :The equivalent circuit of a 4 pole, three phase, 60 hz induction motor is shown in the circuit below. The machine is operating with a rotor current of 20 A at a slip of 0.03. Find: a) the air gap power, output power, rotor PR loss and the rated torque ? b) the magnetizing current and stator current ? 0.13 2 j 0.65 2 j 0.65 2 I2 = 20 A/0 Vị j12.0 2 0.13

A) Although the magnetic field for each phase of a 3-phase induction motor is merely switching back and forth between north and south poles, the resultant magnetic influence from all phases sets up a rotating magnetic field to cut the rotor conductors. a) true b) false B) In a two-pole stator winding of a 3-phase motor, how many revolutions does the rotating tr) magnetic field make in one cycle of the electrical current? a) one b) 60   c) 3600 d) none of the above

A 6-pole, 50-Hz, 3-φ induction motor is running at 950 rpm and has rotor Copper loss of 5 kW. Its rotor input is ......kW.       100     10     95     5.3