Introduction
to Engineering and Technology
CCRI
ENGR-1020-108
Fall 2007
Wind
Turbine Project
Team Members
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Starting Wind Turbine
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Improved Wind Turbine
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Turbine Open Circuit Voltage Test Results
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Detail description |
Detail Photo |
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This is the building of the plywood base
and attaching the ¾ inch galvanized steel flanges. The ply is ¾ inch pine and is a 2 x 4
square with 2 layers. It is glued together with gorilla glue and screwed with
a 1 inch wood screw. |
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This is when we attached the 10”
galvanized pipe to the flanges and then to the base with two more flanges to
attach the windmill. |
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This is the re-wiring of the coils, after
we flattened them out a lot better, in order to get the best voltage this was
very important. |
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We tried some smaller magnets and hooked
up the turbine and the magnets were not strong enough to power the LED. So we used the magnets from the original
turbines and achieved much better results with fewer magnets. |
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This is where we attached the homemade
bearings inside the flanges and mounted the piece with the coils on it to the
flanges. We then also constructed the
turbine itself onto the main shaft. We used rubber grommets for the spacing
and to hold the blades in place so they don’t rub against the coils. |
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This is the finished product which used
aluminum flashing for the blades. The
finished product produced a more stable and constant voltage. It was a design
that was original and unique. |
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2 Original Pico Turbine Kits: $80.00
1 1x8x4 Pine: $3.45
2 ¾ inch galvanized 90 degree elbows: $2.56
4 ¾ inch galvanized floor flanges: $12.44
1 10” x 10’ Aluminum Sheet Metal: $5.65
2 ¾ inch
x 10” galvanized pipe: $8.02
4 T-Nuts
$0.88
7 Rubber Grommets $4.56
1 3pc Tool Kit $10.00
1 Sheet 80 Grit Sandpaper $4.47
1 ¼ inch aluminum shaft $2.64
2 Packs of flat washers $1.05
1 Metal Snips $8.97
1 Hack Saw $6.28
1 #8 Self Tapping Screws $1.76
1 Sheet of Plywood $5.38
2 Rolls Duct Tape $8.00
Total Cost
$166.11
We positioned the completed
turbine approximately 1 inch away from a window fan controlled by a rheostat
that allowed us to vary the speed. We used a hand-held digital anemometer to
gauge the equivalent wind speed. Testing was done at various wind speeds with
no load, with a 100 ohm load, and with a 200 ohm load. The internal resistance
of our turbine was measured at 54.88 ohms; we decided to use the open load for
standard testing, which is shown on the graph below.
Turbine Open Circuit Voltage Test Results
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Pico
turbine Generator Voltage |
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Student |
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Team Energy |
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Procedure |
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1.
Build Pico Turbine and test with LED |
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2.
Disconnect LED and Connect Fluke DVM |
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3.
Vary the RPM using the frequency as an indicator |
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4.
Record RPM, frequency and voltage |
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Nominal |
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N
- Number of loops of wire |
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A
- Area enclosed by loop (m2) |
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*
Average |
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P
- Number of Magnetic poles |
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B
- Magnetic pole strength (Tesla) |
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Z
- Rotational velocity of magnets (cps) |
below |
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F
- Frequency of Voltage (Hz) |
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below |
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Note:
Z = RPM(measured) / 60 |
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Calculated
No-Load rms Voltage |
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Vrms
= 0.707 * N *A *P *B *Z |
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Nominal |
Measured |
Calculated |
Measured |
Calculated |
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RPM |
Vrms-MES |
Vrms-CAL |
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60 |
23 |
0.383333 |
0.44 |
0.176 |
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120 |
43 |
0.716667 |
2.53 |
0.328 |
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180 |
57 |
0.95 |
4.82 |
0.435 |
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240 |
73 |
1.216667 |
5 |
0.557 |
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300 |
92 |
1.533333 |
5.24 |
0.702 |
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360 |
96 |
1.6 |
5.79 |
0.733 |
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420 |
281 |
4.683333 |
6.72 |
2.146 |
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