A four-pole, three-phase 415 V, 50 Hz induction motor has a rated rotor speed at 1445 rpm. The motor is connected to a constant torque load. (i) Sketch the IEEE recommended per-phase equivalent circuit for the three- phase induction motor. Label all the key components clearly. (ii) Determine the motor's synchronous speed in rpm, the motor's slip, and the frequency of the rotor current in Hertz. ii) If the operating frequency of the motor reduced to 40 Hz and the synchronous and rotor speed difference (n,- n,) is maintained at 55 rpm, determine the new motor's synchronous speed and rotor speed.
A four-pole, three-phase 415 V, 50 Hz induction motor has a rated rotor speed at 1445 rpm. The motor is connected to a constant torque load. (i) Sketch the IEEE recommended per-phase equivalent circuit for the three- phase induction motor. Label all the key components clearly. (ii) Determine the motor's synchronous speed in rpm, the motor's slip, and the frequency of the rotor current in Hertz. ii) If the operating frequency of the motor reduced to 40 Hz and the synchronous and rotor speed difference (n,- n,) is maintained at 55 rpm, determine the new motor's synchronous speed and rotor speed.
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Transcribed Image Text:(c) A four-pole, three-phase 415 V, 50 Hz induction motor has a rated rotor speed at
1445 rpm. The motor is connected to a constant torque load.
(i) Sketch the IEEE recommended per-phase equivalent circuit for the three-
phase induction motor. Label all the key components clearly.
(ii) Determine the motor's synchronous speed in rpm, the motor's slip, and the
frequency of the rotor current in Hertz..
(iii) If the operating frequency of the motor reduced to 40 Hz and the synchronous
and rotor speed difference (n.- n,) is maintained at 55 rpm, determine the new
motor's synchronous speed and rotor speed.
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