Question

what would happen if the rotor circuit of the induction motor is shorted ?

what would happen if the rotor circuit of the induction motor is not shorted?

Answer #1

1)

When the rotor circuit of the induction motor is shorted, the induced voltage generates flow of current in the coil and it produces rotor flux due to interaction of rotating magnetic field produced by the stator windings Since induction motor works on principle of mutual inductance and thus the rotor conductors experience a ‘force’ or ‘torque’ due to which the rotor starts rotating

2)

If the two terminals of a rotor windings are kept open there will be induced voltage in stator coils due to mutual induction as happens in case of open circuit (secondary side) transformer but this open circuit voltage will not be able to make any flow of currents in the rotor windings

I
want all information about induction motor (stator & rotor ) ,
how it work ? What the relation between stator and rotor ,, and how
both work together in the motor ??

The induction motor rotor design that can connect to external
resistance using slip rings is: Select one: 1. Cage rotor 2.
Synchronous rotor 3. Wound rotor 4. Polyphase rotor

An 8 poles,230V,60Hz delta connected three-phase induction motor
has a rotor impedance of 0.025+j0.1 phase the stator winding
impedance is negligible and the Xm=infinity.Determine
a- the speed at maximum torque.
b-the maximum torque.
c-the staring torque as a percentage of the maximum torque.
d-what additional resistance must be inserted in the rotor
circuit to make the starting torque equal to 75% of the maximum
torque?

An induction motor has a double-cage rotor with equivalent imped
at standstill of (1.0 + j 1.0) and (0.2 + j 4.0) Ω. Find the
relative values of torque given by each cage (a) at starting and
(b) at 5 % slip

The parameters of a 3-phase, 4-pole, 50 Hz,
Y-connected, wound-rotor induction motor are listed below. These
are the default values of the "Asynchronous Machine" model in
MATLAB Simulink. r1=0.5968 Ω; r2=0.6258 Ω; L1=0.0003495 H;
L2=0.005473 H; Lm=0.0354 H; Stator line voltage = 400 V rms. The
motor for rotor speeds nm= 0 to 1500 rpm.
X1= 0.1097 ohm, X2= 1.719 ohm , Xm= 11.12 ohm, RTH =
0.5853 , XTH = 0.1395 and
VTH = 230.82 V.
Suppose the motor...

The parameters of a 3-phase, 4-pole, 50 Hz, Y-connected,
wound-rotor induction motor are listed below. These are the default
values of the “Asynchronous Machine” model in MATLAB Simulink.
r1=0.5968 ?; r2=0.6258 ?; L1=0.0003495 H; L2=0.005473 H; Lm=0.0354
H; Stator line voltage = 400 V rms. The motor for rotor speeds nm=
0 to 1500 rpm. X1= 0.1097 ohm, X2= 1.719 ohm , Xm= 11.12 ohm, RTH =
0.5853 , XTH = 0.1395 and VTH = 230.82 V. Suppose the motor...

Q4 (a) A 3-phase induction motor having a synchronous speed of
1200rpm draws 80kW from a 3-phase feeder. The copper losses and
core losses in the stator amount to 5kW. If the motor runs at
1152rpm, calculate:
(i) the rotor input power;
(ii) the rotor copper losses;
(iii) the gross mechanical power output;
(iv) the net mechanical power with knowing that the windage and
friction losses are 2kW;
(v) the efficiency of the motor
(b) Compare the brushed motor (DC...

A 6-pole and three-phase induction motor has synchronous speed
of 1125 RPM.
a) Find the no-load and full-load operating speed of motor for
the cases given
1. 2.5Hz electrical frequency of rotor for no-load condition.
(15p)
2. 6.3Hz electrical frequency of rotor for full-load condition.
(15p)
b) Find the speed regulation of motor by using parameters found
above. (10p)
c) Determine the electrical frequency of rotor under full-load
condition so that speed regulation would be equal to 5%?
(Electrical frequency...

A three phase Wye-connected 460 v, 4 poles, 60 Hz wound rotor
induction motor has the following parameters:
R1=0.3, R2=0.15, X1=0.5,
X2=0.2, Xm=14
The total friction, windage, and core loss is constant at 400 w.
The motor is working at its rated voltage and drives its load at
1764 rpm.
a)Calculate the input current and the input power.
b)Calculate the output mechanical power and torque and motor
efficiency.
c)Calculate the starting current of this motor and compare it
with its...

A three phase, 4 pole induction motor has the nominal speed of
1425 rpm. If the stator, rotor and airgap losses are all the same
what is the efficiency of the machine?

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