AHSANULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGY
DEPARTMENT OF ELECTRICAL AND ELECTRONIC ENGINEERING
SESSIONAL REPORT
Course No.
Course Title
: EEE 2106
: Energy Conversion I
Experiment No.
: 10
Name of Experiment : Performance test of a 1-φ induction motor.
Date of Performance : 05.09.2021
Date of Submission : 13.09.2021
Submitted By:
Name
: Sirajus Arefin
Student ID : 19.02.05.049
Year
: 2nd
Semester
: 1st
Section
: A (A2)
Objective: The objective of this experiment is to test performance of a 1-φ
induction motor.
Equipment:
1. 1-φ Variac
2. Wattmeter
3. AC Voltmeter (0-300 V)
4. AC Ammeter (0-2.5 A)
5. Tachometer
6. Wire for Connection
Circuit Diagram:
Data Table:
Input
Current
(A)
Voltage( With
Without
V)
AW
AW
50
0.46
100
0.74
0.76
150
0.93
1
200
1
1.6
230
1.1
2
(AW=Auxiliary Winding)
Wattmeter(
W)
With AW
Without
AW
24
56
32
106
54
140
96
226
144
Speed (RPM)
With
AW
2926
2981
2966
2958
2985
Without
AW
2862
2973
2954
2984
2995
Block Rotor Test
W= 250 W
A= 3.1 A
V= 105 V
Report:
1. Do you notice any appreciable change in power with the change of
speed? Explain in brief.
Ans: Yes, I notice that there was an appreciable change in power with the
change of speed. But with increased voltage, there was no discernible
difference in speed. In the experiment, change in voltage affected the power
consumption. The speed dropped less when it was connected with auxiliary
winding relatively while decreasing voltage compared to when it was not
connected to auxiliary winding.
Increasing voltage affected the current flow and with the increasing current
flow, core loss and copper loss increased. As a result, change in power
consumption occurred due to the change of speed.
Discussion:
In this experiment, performance of a single phase induction motor has been
tested. We measured current, voltage, power and speed at different applied
voltage level. We found that when supply voltage is increasing current value
is increasing too as impedance is almost constant. But there is no noticeable
change in speed of the motor due to the change of voltage. The speed is
almost same for all of the voltage level.
Comparing the values between two different conditions we found out that:
Condition
With Auxiliary Winding
Without Auxiliary
Winding
Current
Decreased
Increased
Power Consumption
Increased
Decreased
The speed normally depends on load connected to the shaft. There was no
load connected in the shaft in our case, so no noticeable change is observed
in speed here. Again with the increase of voltage we notice increase in
power consumption. Now this power consumption actually refers to the
power loss.
Because as there is no load connected, there shouldn’t be any power
consumption rather power consumption is increasing with the increase of
input voltage. As the current was higher, the loss occurs is copper loss and
due to increase in supply voltage the loss that happens is core loss. The
experiment showed roughly the expected results with a slight variation
compared to the motor specifications.