threephase Yconnected 460V lineline 37kW 60Hz fourpole 612 i

three-phase, Y-connected, 460-V (line-line), 37-kW, 60-Hz, four-pole 6,12 induction motor has the following equivalent circuit parameters in ohms-per-phase referred to the stator: 0.070 R 0.152 0.743 2-0.764 X 40.1 The total friction and windage losses may be assumed constant at 390 W, and the core loss may be assumed to be equal to 325 W With the motor connected directly to a 460-V source, compute the speed, output shaft torque and power, input power, and power factor and efficiency for slips of 1, 2, and 3 percent. You may choose either to represent the core loss by a resistance connected directly across the motor terminals or by resistance Ro connected in parallel with the magnetizing reactance Xm

Solution

.