A 3-phase, 50-Hz induction motor with its rotor star-connected gives 500 V (r.m.s.) at standstill between the slip-rings on open-circuit. Calculate the current and power factor at standstill when the rotor winding is joined to a star-connected external circuit, each phase of which has a resistance of 10 Q and an inductance of 0.04 H. The resistance per phase of the rotor winding is 0.2 Q and its inductance is 0.04 H. Also, calculate the current and power factor when the slip-rings are short-circuited and the motor is running with a slip of 5 per cent. Assume the flux to remain constant.
A 3-phase, 50-Hz induction motor with its rotor star-connected gives 500 V (r.m.s.) at standstill between the slip-rings on open-circuit. Calculate the current and power factor at standstill when the rotor winding is joined to a star-connected external circuit, each phase of which has a resistance of 10 Q and an inductance of 0.04 H. The resistance per phase of the rotor winding is 0.2 Q and its inductance is 0.04 H. Also, calculate the current and power factor when the slip-rings are short-circuited and the motor is running with a slip of 5 per cent. Assume the flux to remain constant.
Introductory Circuit Analysis (13th Edition)
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Transcribed Image Text:A 3-phase, 50-Hz induction motor with its rotor star-connected gives 500 V (r.m.s.) at standstill
between the slip-rings on open-circuit. Calculate the current and power factor at standstill when the
rotor winding is joined to a star-connected external circuit, each phase of which has a resistance of
10 Q and an inductance of 0.04 H. The resistance per phase of the rotor winding is 0.2 N and its
inductance is 0.04 H.
4.
Also, calculate the current and power factor when the slip-rings are short-circuited and the motor is
running with a slip of 5 per cent. Assume the flux to remain constant.
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