You have been appointed as an electrical consultant by induction motor company.
The company is requesting you to determine several parameters and other
important specification for the induction motor before it can be delivered to the client.
In addition, the client wanted the load torque, $T_{load}$, in the range of 20 Nm to 40 Nm.
You are required to prepare a report based on the specifications data in TABLE Q3.
TABLE Q3
Terminal voltage, $V_T$ = 415 V
$Z_1$ = 0.2 + j0.41 ?
$P_{core}$ = 180 W
Number of poles = 2
Frequency = 50 Hz
$Z_2$ = 0.12 + j0.41 ?
$P_{mech}$ = 250 W
Power rated = 15 hp
$X_M$ = 15 ?
$P_{misc}$ = 0 W
Motor connection = Y (Star) wound rotor
Construct the equivalent circuit for the motor with all parameters identified clearly.
Suggest a value for slip, $s$, thus the motor could deliver the required load
torque, $T_{load}$, and calculate all necessary parameters. Discuss the effect of slip, $s$,
for the induction motor in terms of load torque and speed characteristic.
[30 marks]
