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A 60hp, 460-V, 60-Hz, six-pole, Y-connected, three phase induction motor is running with a slip of 5.2%. The equivalent circuit parameters are Stator resistance, R = 0.14 2, Stator Reactance, X-0.64 S2, X- 20.2 2 Rotor resistance (referred to stator), R - 0.18 2 Rotor Reactance (referred to stator), X - 1.06 2 P (F&W or, rotational) + P (misc. or, stray) = 205W Determine 1) Line current ii) Rotor current iii) Core loss

A 60hp, 460-V, 60-Hz, six-pole, Y-connected, three phase induction motor is running with a slip of 5.2%. The equivalent circuit parameters are Stator resistance, R = 0.14 2, Stator Reactance, X-0.64 S2, X- 20.2 2 Rotor resistance (referred to stator), R - 0.18 2 Rotor Reactance (referred to stator), X - 1.06 2 P (F&W or, rotational) + P (misc. or, stray) = 205W Determine 1) Line current ii) Rotor current iii) Core loss

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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1. A 60hp, 460-V, 60-Hz, six-pole, Y-connected, three phase induction motor is running with a slip of 5.2%. The equivalent circuit parameters are Stator resistance, R = 0.14 2, Stator Reactance, X= 0.64 2, X= 20.2 2 Rotor resistance (referred to stator), R = 0.18 2 Rotor Reactance (referred to stator), X = 1.06 2 P(F&W or, rotational) + P (misc. or, stray) = 205W Determine 1) Line current i1) Rotor current ii) Core loss iv) Eficiency of the motor If the motor is to be operated on a 50-Hz power system, what must be done to its supply voltage? Why? What will the equivalent circuit component values be at 50 Hz? 2. A 420-V, four-pole. 60-hp, 50-Hz, Wye connected, three-phase induction motor develops its full-load induced torque at 3.2 percent slip when operating at 50 Hz and 420V. The per-phase circuit model impedances of the motor are Stator Resistance, R=0.062 2, Stator Reactance, XI = 0.34 2, X= 20.22 Rotor Reactance (referred to stator), X = 0.40 2 Mechanical, core, and stray losses may be neglected in this problem. I. Find the rotor resistance, R: II. Find the value of slip at which maximum torque occurs for this motor.
Transcribed Image Text:1. A 60hp, 460-V, 60-Hz, six-pole, Y-connected, three phase induction motor is running with a slip of 5.2%. The equivalent circuit parameters are Stator resistance, R = 0.14 2, Stator Reactance, X= 0.64 2, X= 20.2 2 Rotor resistance (referred to stator), R = 0.18 2 Rotor Reactance (referred to stator), X = 1.06 2 P(F&W or, rotational) + P (misc. or, stray) = 205W Determine 1) Line current i1) Rotor current ii) Core loss iv) Eficiency of the motor If the motor is to be operated on a 50-Hz power system, what must be done to its supply voltage? Why? What will the equivalent circuit component values be at 50 Hz? 2. A 420-V, four-pole. 60-hp, 50-Hz, Wye connected, three-phase induction motor develops its full-load induced torque at 3.2 percent slip when operating at 50 Hz and 420V. The per-phase circuit model impedances of the motor are Stator Resistance, R=0.062 2, Stator Reactance, XI = 0.34 2, X= 20.22 Rotor Reactance (referred to stator), X = 0.40 2 Mechanical, core, and stray losses may be neglected in this problem. I. Find the rotor resistance, R: II. Find the value of slip at which maximum torque occurs for this motor.
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