Please do question 3 only. Problem 1A 209-V, three-phase, six-pole, Y-connected induction motor has the following parameters:R₁ = 0.128 0, R'2 = 0.0935 , Xeq =0.490.The motor slip at full load is 2%. Assume that the motor load is a fan-type. If an external resistance equalto the rotor resistance is added to the rotor circuit, calculate the following:a. Motor speedb. Starting torquec. Starting currentd. Motor efficiency (ignore rotational and core losses)Problem 2For the motor in Problem 1 and for a fan-type load, calculate the value of the resistance that should beadded to the rotor circuit to reduce the speed at full load by 20%. What is the motor efficiency in this case?Ignore rotational and core losses.Problem 3For the motor in Problem 1 and for a fan-type load, calculate the following if the voltage is reduced by 20%:a. Motor speedb. Starting torquec. Starting currentd. Motor efficiency (ignore rotational and core losses)

It is given that: V1=209 VV2=0.8V1P=6f=60 HzR1=0.128 ohmR2'=0.0935 ohmXeq=0.49 ohmS1=0.02Fan type…

Problem 3 For the motor in Problem 1 and for a fan-type load, calculate the following if the voltage is reduced by 20%: a. Motor speed b. Starting torque c. Starting current d. Motor efficiency (ignore rotational and core losses)

Problem 3 For the motor in Problem 1 and for a fan-type load, calculate the following if the voltage is reduced by 20%: a. Motor speed b. Starting torque c. Starting current d. Motor efficiency (ignore rotational and core losses)

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter35: Harmonics 916

Section: Chapter Questions

Problem 3RQ: Would a positive-rotating harmonic or a negative-rotating harmonic be more harmful to an induction...

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Concept explainers

Motor Load, Torque, and Power Quality Requirement

An electric motor is a gadget that changes electrical energy into mechanical energy over to follow up on a mechanical burden. The weight set on the motor because of this mechanical movement is known as motor load. Appropriately matching the motor burden to the engine is vital to forestall harm to the engine or wasteful and unnecessary expensive activity. Engines perform such undertakings as moving a thing starting with one spot then onto the next, cutting it, changing its shape, etc. The motors might be evaluated as far as a few variables including power yield, voltage, current, and temperature. Harm to an engine might happen when it is worked under over the top engine load contrasted with its appraised limit.

Question

Please do question 3 only.

Problem 1
A 209-V, three-phase, six-pole, Y-connected induction motor has the following parameters:
R₁ = 0.128 0, R'2 = 0.0935 , Xeq =0.490.
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
b. Starting torque
c. Starting current
d. Motor efficiency (ignore rotational and core losses)
Problem 2
For the motor in Problem 1 and for a fan-type load, calculate the value of the resistance that should be
added to the rotor circuit to reduce the speed at full load by 20%. What is the motor efficiency in this case?
Ignore rotational and core losses.
Problem 3
For the motor in Problem 1 and for a fan-type load, calculate the following if the voltage is reduced by 20%:
a. Motor speed
b. Starting torque
c. Starting current
d. Motor efficiency (ignore rotational and core losses)

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