- #1
rob1985
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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 II0
(assume no load current II0 is magnetising losses) and the equivalent
circuit magnetising circuit parameters R0 and X0.
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 II0
(assume no load current II0 is magnetising losses) and the equivalent
circuit magnetising circuit parameters R0 and X0.