Fundamentals of Management
Autor: Joshua • November 14, 2018 • 1,330 Words (6 Pages) • 593 Views
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RPM Meter
- Theoretical Diagram:
[pic 8]
- Connection Diagram:
[pic 9]
Fig. 2: Connection Diagram
- Conducting the Experiment:
- The components were set up as shown in Fig. 2.
- The voltage PS4 and PS1 were set to 0V.
- The power supply was switched on and PS1 was adjusted to 380V.
- The excitation current was increased from 0% to 100% in steps of 10%.
- At each step, the values of voltage and excitation current was tabulated.
- The steps above was repeated while decreasing the excitation current from 100% to 10%.
- The values obtained was used to plot the ascending and descending.
NO LOAD TEST
- Components:
DC Shunt Excitation Machine Model A4244
Power Supply Model A0240
Cables Model A4890
Cables Support Model A4891
Coupling Base Model A4840
Ammeter With adequate range for this test
Voltmeter With adequate range for this test
RPM Meter
- Theoretical Diagram:
[pic 10]
- Connection Diagram:
[pic 11]
Fig. 3: Connection Diagram
- Conducting the Experiment:
- The components were set up as shown in Fig. 3.
- The voltage PS4 and PS3 was set to 0V.
- The power supply was switched on and PS4 was set to 220V. PS3 was increased gradually until the speed reached 300 rpm.
- The current and the voltage was measured and tabulated.
- PS3 was decreased with -10V
- PS4 was decreased and the speed was checked to be at 3000 rpm.
- The experiment was completed when the armature voltage is so low that the motor begins to slow down.
- PS4 and PS3 was adjusted to 0V to stop the machine.
- The values obtained was used to plot the graph.
RESULTS AND ANALYSIS
MEASUREMENT OF THE WINDINGS RESISTANCE
Winding: Armature
Parameter
Symbol
Unit
Value
Winding Voltage
220V
%
2
4
6
8
10
Winding Voltage
V
V
4.4
8.8
13.2
17.6
22
Winding Current
I
A
0.16
0.32
0.51
0.68
0.85
Winding Resistance (calculation)
R
Ω
27.5
27.5
25.9
25.9
25.9
Winding: Field
Parameter
Symbol
Unit
Value
Winding Voltage
220V
%
2
4
6
8
10
Winding Voltage
V
V
4.4
8.8
13.2
17.6
22
Winding Current
I
A
5.2m
10.1m
15.1m
20.2m
25.3m
Winding Resistance (calculation)
R
Ω
846
871
874
871
870
From
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