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A four-pole, star-connected, squirrel-cage induction motor operates from a variable voltage 50 Hz three-phase supply.
The following results were obtained as the supply voltage was gradually reduced with the motor running on no-load.
Stator line voltage 220 164 112 88 42
Stator line current (amperes) 6.8 5.4 3.9 3.8 3.7
Stator power (watts) 470 360 278 244 232
(a) By plotting a suitable graph from these results, determine the total of windage and friction losses, the no load magnetising current Io (assume no load current Io is magnetising losses) and the equivalent circuit magnetising circuit parameters Ro and Xo.
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The project aims at determining the equivalent circuit of 3 Phase squirrel cage induction motor by performing No load and blocked rotor tests. The No load test can determine the shunt component of the equivalent circuit and can further help to calculate the Core losses and Mechanical losses by performing the test at variable supply voltages. The blocked rotor test on the other hand helps to determine the copper losses and the series component of Equivalent circuit with respect to the stator.
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