The motor is connected to 220 V supply through a cable of 1.30 ? inductive reactance per phase. At a speed of 1710 rpm, calculate the following:
A four-pole, 60 Hz, Y-connected, squirrel cage induction motor has the following
parameters:
a. Motor current and input power.
b. Terminal voltage
c. Developed torque
Also calculate the terminal voltage at starting. What is the percent change of the
terminal voltage? Can you explain the change in the terminal voltage at starting?
a.
b.
c.
d.
To find Vstart, find I’2 using the method in part (a) except with s = 1 and find Vt as
found in part (b).
Vstart = 89.31 V
High slip implies low rotor resistance, which in turn means high current. This
means a high voltage drop in the connecting cable, which explains the low
terminal voltage. This can be resolved by adding a starting resistance to the rotor
windings to keep the starting current low and the terminal voltage close to the
rated value.
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