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  3. tests were carried out on a three-phase 220 v, 50

Tests were carried out on a three-phase 220 V, 50 Hz, 4-pole delta-connected induction motor. The...

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Electrical Engineering

Tests were carried out on a three-phase 220 V, 50 Hz, 4-poledelta-connected induction motor. The followingresults were obtained from open circuit (no-load) and short circuittests.

            OpenCircuit (no-load) Test

Applied Stator Voltage

VLine (V)

Stator Line Current

ILine (A)

Total Input Power

Pin (W)

240

9.6

536

220

7.2

420

200

5.4

352

180

4.3

304

160

3.5

276

140

3.0

248

120

2.5

224

            ShortCircuit (locked rotor) Test

Applied Stator Voltage

VLine (V)

Stator Line Current

ILine (A)

Total Input Power

Pin (W)

72

14

674

           A dc resistance test indicates that the stator resistance per phaseis 1.165 W.

a)       Estimate the machine’s friction and windage loss and determine theparameters of the full equivalent circuit of the machine.

Using an appropriate form of the machine equivalent circuit:

b)         Calculate thelosses in the machine and draw a power flow diagram whichillustrates the flow of power through the machine when it runson-load with a slip of 0.06

c)        Determine the starting torque, and also the torque when runningwith a slip of 0.06.

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