7-Assignment7

7-Assignment7 - ELECTRICAL ENGINEERING DEPARTMENT...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
ELECTRICAL ENGINEERING DEPARTMENT California Polytechnic State University EE 255 Assignment #7 Problem #1 A 208-V, three-phase, 2-pole, 60-Hz Y-connected wound rotor induction motor is rated at 15- hp. Its equivalent circuit components are: R 1 =0.2 Ohms R 2 =0.12 Ohms X m =15.0 Ohms X 1 =0.41 Ohms X 2 =0.41 Ohms P mech =430 W P stray =0 P core =0 Determine the slip at pullout torque and the pullout torque of this motor. Problem #2 A 440-V, three-phase, 2-pole, 50-Hz Y-connected wound rotor induction motor is rated at 75 KW. Its equivalent circuit components are: R 1 =0.075 Ohms R 2 =0.065 Ohms X m =7.2 Ohms X 1 =0.17 Ohms X 2 =0.17 Ohms P mech =2.1 KW P stray =150 W P core =0 Determine the slip at pullout torque, the pullout torque, and the rotor speed at the pullout torque of this motor. Problem #3 If the motor in Problem 2 is to be driven from a 440-V, 60 Hz power supply, what will the pullout torque be? What will the slip be at pullout torque? Problem #4
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.
Ask a homework question - tutors are online