Q5) A 10 kW, 400 V, 3 phase, 4pole, 50 Hz, slip ring induction motor develops its rated output at rated voltage and frequency and with its slip rings short circuited. The maximum torque equal to twice the full load torque, occurs at a slip of 0.1. Stator impedance and rotational losses are neglected (use approximate equivalent circuit). Determine: a- The slip and rotor speed at full load torque. (Ans: Sn= 0.026, Nr= 1459.8 r.p.m) b- The starting current in terms of full load current. (Ans: Is=0.103 In C- The rotor copper losses at full load torque. (Ans: 275.38 watt) d- The starting torque at rated voltage and frequency. (Ans:25.9 N.m) The rotor resistance is now trebled by inserting external resistance in the rotor circuit. Find3; e- The slip at maximum torque. (Ans: SA= 0.3)

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Q5) A 10 kW, 400 V, 3 phase, 4pole, 50 Hz, slip ring induction motor
develops its rated output at rated voltage and frequency and with its slip
ample 7:
rings short circuited. The maximum torque equal to twice the full load
he test datr
torque, occurs at a slip of 0.1. Stator impedance and rotational losses
1710 rpm
are neglected (use approximate equivalent circuit). Determine:
The sta
a- The slip and rotor speed at full load torque. (Ans: Sn= 0.026, Nr=
1459.8 r.p.m)
b- The starting current in terms of full load current. (Ans: Is=0.103 In)
c- The rotor copper losses at full load torque. (Ans: 275.38 watt)
d- The starting torque at rated voltage and frequency. (Ans:25.9
N.m)
The rotor resistance is now trebled by inserting external resistance in
the rotor circuit. Find3;
e- The slip at maximum torque. (Ans: S^= 0.3)
Transcribed Image Text:Q5) A 10 kW, 400 V, 3 phase, 4pole, 50 Hz, slip ring induction motor develops its rated output at rated voltage and frequency and with its slip ample 7: rings short circuited. The maximum torque equal to twice the full load he test datr torque, occurs at a slip of 0.1. Stator impedance and rotational losses 1710 rpm are neglected (use approximate equivalent circuit). Determine: The sta a- The slip and rotor speed at full load torque. (Ans: Sn= 0.026, Nr= 1459.8 r.p.m) b- The starting current in terms of full load current. (Ans: Is=0.103 In) c- The rotor copper losses at full load torque. (Ans: 275.38 watt) d- The starting torque at rated voltage and frequency. (Ans:25.9 N.m) The rotor resistance is now trebled by inserting external resistance in the rotor circuit. Find3; e- The slip at maximum torque. (Ans: S^= 0.3)
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