480-V, 60-Hz, four-pole Y-connected induction motor runs at 1735 rpm when operating at full load. Assume the friction and windage losses are 1.6 kW and core losses are 1.3 kW. The motor parameters are: R₁ = 0.05 ohm, R2 = 0.04 Ohm, X₁ = 0.18 Ohm, X2 = 0.08 Ohm, X = 0.16 Ohm. find the torque at 1735 rpm using the approximate torque-slip equation.

480-V, 60-Hz, four-pole Y-connected induction motor runs at 1735 rpm when operating at full load. Assume the friction and windage losses are 1.6 kW and core losses are 1.3 kW. The motor parameters are: R₁ = 0.05 ohm, R2 = 0.04 Ohm, X₁ = 0.18 Ohm, X2 = 0.08 Ohm, X = 0.16 Ohm. find the torque at 1735 rpm using the approximate torque-slip equation.

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 13RQ: A squirrel-cage induction motor is operating at 1175 RPM and producing a torque of 22 Ib-ft. What is...

See similar textbooks

Similar questions

Name three factors that determine the torque produced by an induction motor.
Why are different motor connections shown for what appears to be the same motor in the various diagrams in Figure 332? FIG. 332 Typical arrangements for four-speed, three-phase, two-winding motors.
A 209-V, three-phase, six-pole, Y-connected induction motor has the following parameters: R1 = 0.128 Ω, R’2 = 0.0935 Ω, Xeq =0.49Ω. The motor slip at full load is 2%. Assume that the motor load is a fan-type. If an external resistance equal to the rotor resistance is added to the rotor circuit, calculate the following: a. Motor speed, Starting torque, Starting current, and Motor efficiency (ignore rotational and core losses) b. Calculate the value of the resistance that should be added to the rotor circuit to reduce the speed at full load by 20%. Find the motor efficiency. c. If the voltage is reduced by 20%, calculate the Motor speed, Starting torque, Starting current, and Motor efficiency (ignore rotational and core losses) d. If the supply frequency is reduced by 20%, calculate the Motor speed, Starting torque, Starting current, and Motor efficiency (ignore rotational and core losses) ..
A six pole three-phase 440-volts 50Hz, induction motor develops an 8-Hp at 955 rpm, the power factor being 0.85.Stator losses amounts to 400-watts and the frictional losses to 5-Hp. Calculate the (a) slip (b) rotor copper losses (c) input to the rotor (d) efficiency (e) the line current.
A 3-phase, 4 pole, 230 V, 60 Hz wound-rotor induction motor has both its stator and rotorconnected in Y. The rotor has half as many turns per phase as the stator. If the rotor is runningat 1725 rpm, Rr is 0.075 ohms and Xs = 0.375 ohms, determine the torque developed by themotor.
A 484 V, 18862 hp, 60 Hz, four pole, Y-connected induction motor has the impedance parameters R1 = 0.673 Ω, R2 = 0.338 Ω,X1 =j1.106Ω,X2 =j0.464ΩandXM =j26.3Ω,perphase referred to the equivalent circuit in the following figure. For a rotor slip of 2.2 percent at rated voltage and rated frequency, determine total impedance, stator current, maximum torque, slip at maximum torque.
A 460 V, 60 Hz, Star connected, 870 r.p.m., Eight poles, Three-Phase Induction Motor has the following per phase parameters: R1 = 0.07, R2 = 0.05, X1 = X2 = 0.2, Xm = 6.5, Draw the approximate equivalent circuit and determine the following:I. Starting TorqueII. Maximum TorqueIII. Rated TorqueIV. Stator CurrentV. Power FactorVI. Input PowerVII. Magnetizing Current
A large 3-phase, 4000 V, 60 Hz, squirrel-cage induction motor draws a current of 385 A and a total active power of 2344 kW when operating at full-load. The corresponding speed is accurately measured and is found to be 709.2 RPM. The stator is connected in wye and the resistance between two stator terminals is 0.10 Ω. The total iron losses are 23.4 kW and the windage and friction losses are 12 kW. Calculate the following: a) The power factor at full load.b) The active power supplied to the rotor.c) The total I²R losses in the rotor.d) The load mechanical power (kW), torque (kN-m) and efficiency (%).
The no-load and locked-rotor test results of a three-phase 10 HP, 220 V, 60 Hz, 6 poles star connected induction motor are; The no-load test: VNL=220 V, PNL=340 W, INL=6.2 A The locked-rotor test: VSC=54 V, PSC =430 W, ISC =15.2 A The voltage across the stator windings is 2 V when nominal DC current flows through it. Coefficient for DC resistance is 1,25. a) Calculate the equivalent circuit parameters and draw the complete single-phase equivalent circuit of the induction motor. b) Calculate efficiency of the motor for s=0.06 by using the approximate equivalent circuit (RFe core resistance is not ignored). c) Shaft torque for s=0,06 d) Slip value at the maximum (breakdown) torque, e) Maximum (breakdown) torque of the induction motor. f) Speed of the motor at maximum torque point. g) Rotor frequency at maximum torque.
480-V, 60-Hz, four-pole Y-connected induction motor runs at 1735 rpm when operating at full load. Assume the friction and windage losses are 1.6 kW and core losses are 1.3 kW. The motor parameters are: R₁ = 0.05 ohm, R2 = 0.08 Ohm, X₁ = 0.18 Ohm, X2 = 0.16 Ohm, Xm = 0.16 Ohm. find the torque at 1735 rpm using the approximate torque-slip equation.
A 3-phase, 260–V, 50-Hz, 22 HP, 6-pole, Y-connected induction motor has the following per phase parameters in ohms per-phase referred to the stator side: R1 = 0.04 Ω , R2 = 0.1 Ω , X1 = 0.223 Ω , X2 = 0.5 Ω , XM = 10 Ω The total friction, windage, and core losses can be assumed to be constant at 3 KW, independent of load. Find the starting code letter factor of this motor. Select one: a. Starting Code-Letter Factor is: C b. Starting Code-Letter Factor is: F c. None d. Starting Code-Letter Factor is: E e. Starting Code-Letter Factor is: D
A single-phase, 120 V, 60 Hz, four-pole, split-phase induction motor has the following equivalentcircuit parameters: R1m=1.5Ω, R1a=2.5Ω, R/2=1Ω, X1m=2.5Ω, X1a =2.5Ω, X/2=1.5Ω, Xmag =40Ωa) Determine the standstill impedances (Zm, Za) of the windings.b) Determine the starting torque and the starting current of the motor if it is started from rated voltagemains as a resistor split-phase motor.c) Determine the value of the capacitor to be connected in series with the auxiliary winding toproduce maximum starting torque per ampere of starting current. Determine the value of thestarting torque and starting current.d) Compare the starting torque per ampere of starting current for cases (b) and (c)