Question

Problem#(50 points) The nameplate for a three phase induction motor is shown below. The "NEMA NOM. EFF." of 93.6% can be taken to be the efficiency. Keep in mind that voltage and current in a 3PH system are specified as line voltage and current SIEMENS PE 21 PLUS PREMUM EFFICE 40 LL AND CHEMICAL DUITY QUALL Part A Assume the motor is run at the rated nameplate conditions: (a) Find the real electrical input power. (b) Find the numerical value for power factor, and state whether it is most likely leading or lagging (c) Find the torque (d) Find the slip percent. (e) Find the reactive power Q Part B Suppose the motor was attached to a load requiring torque 50% higher than in Part A. Assume that the motor continues to run without stalling. (a) Would the current increase or decrease? Would the change be much less than 50%, about 50%, or much more than 50%? (b) Would the speed increase or decrease? Would the change be much less than 50%, about 50%, or much more than 50%? Part C Assume the motor is wye connected, and that t is connected to a wye source. Sketch the connections between the source and the motor. Give a voltage (hint: not 460V) and a phase for each of the voltage sources. SIEMENS PE-21 PLUS™ ONOI TLA02864SE41 H.P. 30.00 PREMIUM EFFICIENCY 1.15 VOLTS 460 ATZ|60 3 PH AMPS 34.9 1765 DUTY CONT 40 C AMB 50BCO3UPP3 CO MILLAND CHEMICAL DUTY QUALITY NDUCTİON MOTOR 。

Answer 1

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