PLEASE CALCULATE Q4 PART B G7 = 8 G6= 9
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
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Question
PLEASE CALCULATE Q4 PART B
G7 = 8
G6= 9
Transcribed Image Text:Q4 (а)
Indicate the relevant changes in induction motor performance (eg output
power, torque, efficiency) to the following changes in operation or motor
characteristics:
(i)
An increase in the supply voltage.
(ii)
A decrease in the stator resistance.
(iii)
An increase in the magnetising reactance.
(iv)
The motor being delta connected rather than star connected.
(b) A 3 phase 6 pole star connected induction machine operates from a 1G70 V
(phase voltage) and 60 Hz supply. Given the equivalent circuit parameters
shown in Table Q4b, and assuming the friction and windage loss is negligible,
calculate the following parameters when operating at a speed of 116G6 rpm:
The slip.
The mechanical power (W).
The torque (Nm).
The Input Power (W).
The no load current (A).
(ii)
(ii)
(c)
A 4 pole 3 phase induction motor produces test results outlined in Table Q4c
when operating from a phase voltage of 2G50 V and 50 Hz supply frequency.
(i)
Neglecting friction and windage loss calculate the per phase
equivalent circuit parameters for this motor.
(ii)
Calculate the mechanical power when operating at full load.
Parameter| Value
Units
Хм
25
Ω
Rc
70
Ω
90
Xeg
R,
600
80
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