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 four-pole, 60 Hz, Y-connected, squirrel cage induction motor has the following
parameters:
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. Motor current and input power.
b. Terminal voltage
c. Developed torque
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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