- #1

rob1985

- 24

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Thread moved from the technical forums, so no Homework Template is shown

Hi I was wondering if someone could tell me the equation for finding out what the windage and friction losses are based on the information below. I've drawn the graph and I can work out the I/0, R0 and X0A four-pole, star-connected, squirrel-cage induction motor operates froma 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 I

(assume no load current I

circuit magnetising circuit parameters

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 I

*I*0(assume no load current I

*I*0 is magnetising losses) and the equivalentcircuit magnetising circuit parameters

*R*0 and*X*0.