1. A 690-V, six-pole A-connected induction motor runs at 1085 rpm when operating at a full load. Assume the friction and windage losses are 2.9 kW and core losses are 3.1kW. the motor paramet are: R₁ = 0.06 Ohm, R2 = 0.05 Ohm, X₁ = 0.21 Ohm, X₂ = 0.19 Ohm, Xm = 18.5 Ohm. a. Find the speed of the motor in both rpm and rad/sec. b. Find the air-gap power. c. Find the motor efficiency. 2. For the motor of problem 1 (top problem), find the following: a. Find the maximum torque and the slip in which it happens. What is the rotor speed at th slip in rpm? b. Find the start-up torque. c. Find the rotor resistance which would result in maximum torque occurring at the rotor
1. A 690-V, six-pole A-connected induction motor runs at 1085 rpm when operating at a full load. Assume the friction and windage losses are 2.9 kW and core losses are 3.1kW. the motor paramet are: R₁ = 0.06 Ohm, R2 = 0.05 Ohm, X₁ = 0.21 Ohm, X₂ = 0.19 Ohm, Xm = 18.5 Ohm. a. Find the speed of the motor in both rpm and rad/sec. b. Find the air-gap power. c. Find the motor efficiency. 2. For the motor of problem 1 (top problem), find the following: a. Find the maximum torque and the slip in which it happens. What is the rotor speed at th slip in rpm? b. Find the start-up torque. c. Find the rotor resistance which would result in maximum torque occurring at the rotor
Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter32: Three-phase Motors
Section: Chapter Questions
Problem 6RQ: Name three factors that determine the torque produced by an induction motor.
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