Question

Explain how an induction motor works

Answer #1

Can you explain how proof by induction works and give an
example?

1- What are slip and slip speed in an induction motor?
2- How does an induction motor develop torque?
3- Why is it impossible for an induction motor to operate at
synchronous speed?
4- Sketch and explain the shape of a typical inductionmotor
torque-speed characteristic curve?
Make the work clear, understandable and readable please.
Thanks!

a. Define synchronous speed, slip and slip speed for
an induction motor.
b. State the formula for slip and define all parameters
c. Calculate the slip when induction motor is stationary and
running at synchronous speed.
d. State and explain two (2) methods of starting induction
motor.
e. With neat diagram explain star/delta method of starting
induction motor.
h. Explain how induction motor can be protected from overload and
short circuit fault.

Sketch and explain the shape of a typical induction motor
torque-speed characteristic curve.

1, Explain the relation between reactive and real power in
squirrel cage induction motor with load and with no load. ( just
explain no need formulas)
2, in
squirrel cage induction motor with load , what is the relation of
Torque -speed curve , line current vs rated load and slip Vs rated
load.

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 ??

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?

Why is the role of running capacitor in Ac induction motor? Why
only 1 phase motor has a running capacitor and whereas 3 phase
motor does not have?

Calculate the input current of an induction motor if the motor
speed is 1720 rpm. Use the 60 Hz four-pole, 480V motor data per
phase are: Vm: =480V , Rm: = 65ohms , Xm: = 35ohms , P:= 4
Rsta: = 0.1ohms , Xsta = 0.35 ohms , Rrot = 0.125ohms , Xrot =
0.4ohms

a three phase induction motor delivers %00 HP at the efficiency
of 90% when the operating point of p.f is 0.8 lag. a loaded
synchronous motor with power consumption of 120KW is connected in
parallel with the induction motor. calculate the necessary and the
operating power factor of the synchronous motor if the overall
power factor is to be unity.

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