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8/3/2019 Design Review PP (12-1)
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Precision Variable Frequency Drive
Group May07-13
Jason KilzerNick Nation
Dave Reinhardt
Matt Shriver
Client: Jim Walker
Faculty Advisor: Professor Ajjarapu
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Precision Variable Frequency Drive
Nick Uses and Constraints
Jason Technology and Overall Design
Matt Detailed Design
Dave Requirements, Schedules, Conclusions
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Problem Statement
The problem is the ability of a record player to keep a specific speed.The synchronous motor used on a record player is supposed to playthe record at a specific speed. However, the motor does not always
run at the specified speed which causes the record to sound out ofpitch. A precision variable frequency drive will provide a constantfrequency to the synchronous motor which in turn will maintain aconstant speed of the record table.
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Executive Summary
Synchronous motors are motors that run at a specific speed. A
customer may want to run the motor at different speeds, like for a
record player that needs to operate at 45 and 33 1/3 rpm. A
precision variable frequency drive is a way to speed up or slow
down the motor by changing the frequency of the input voltage.
This product will be designed to adjust the frequency between 58 to
62 hertz by the turning of a dial. The digital display will be
accurate up to the thousandth of a hertz. In addition, a strobe light
will allow the user to observe the rpm of the motor. The precisionvariable frequency drive will have a long term drift that requires a
gradual decrease/increase of speed that allows for more accurate
tuning.
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Operating Environment
Indoors
No extreme dust No extreme temperatures
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Intended Users and Uses
Users
Avid music listener
Lay person
Uses
Adjust the frequency of the turn-table
With other synchronous motors
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Assumptions
Constant linkage the belt connecting the motor to the turntable is
constant over a short time period. Basically, an increase in motor speed
by a certain factor will result in an increase in the speed of theturntable by the same factor.
Plug the plug from the record player can plug into a standard three
pronged outlet.
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Limitations
Precision the precision variable frequency drive will be accurate to .1
Hertz.
Price the total end product cost must be less than $1,000.
Frequency Range 58 to 62 Hertz with step of 0.1 Hertz.
Nominal Voltage 120 VAC. Stability the precision variable frequency drive must be stable. Short
term stability of less that +/- 0.01%. It shall not be affected by
fluctuations in incoming voltage or frequency.
Power Output 75 W minimum.
Input Voltage the input voltage will be a standard household outlet of120 V at 60 Hz. single phase
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Design Considerations
Maximum weight and size
Minimum power output
Minimum operating frequency
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Functional Requirements
Synchronous motor frequency controller
Knob controller to adjust frequency
Digital read-out of frequency
Portable strobe system
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Technology Considerations
Pulse Width Modulation
Crystal Oscillator
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Technology Approach Considerations
1. An AC/DC converter was needed to change the input of AC voltage to DC
voltage.
2. The pulse width modulator will allow the user to change the frequency of the
voltage.
3. A low pass filter would change the DC signal back into an AC signal at the
desired frequency.
4. A amplifier would be needed to step the voltage up to an appropriate level to
feed the turn-table.
5. A frequency counter would be used to display the frequency output of the
low pass filter.6. A strobe light system would be used to measure the RPM of the motor.
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Testing Considerations
Pulse-width modulator
Strobe system
Complete system
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Product Design
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Power Source
110-120 VAC
60 Hz nominal frequency
Standard wall outlet
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AC to DC Converter
The AC to DC converter will take in 120 VAC and
produce 25 Volt DC. The project team will purchase
this component. The group is going to purchase aconverter of the same type that a cell phone charger
would use. The converter is around $20 to purchase.
After the power has been changed into DC pulse width
modulation can take place.
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Circuit Simulation via Simulink
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Pulse Width Modulator (PWM)
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Circuit Design of PWM
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Triangle Waveform Generator Circuit
U2
uA741
3
2
7
4
6
1
5
+
-
V+
V-
OUT
OS1
OS2
U1
uA741
3
2
7
4
6
1
5+
-
V+
V-
OUT
OS1
OS2
R3
10k-VCC+VCC
00
R5
12.5k
0
V1
10Vdc
V2
-10Vdc
-VCC
0
R4
1k
R2
20k
0
Z4
Zener_diode
+VCC
V3
0Vdc
-VCC
C1
1n
+VCC
V
Z3
Zener_diode
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Triangle Waveform
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Comparator Circuit+VCC
V2
-10Vdc
V1
10Vdc
Q1
Q2N3904
VTRI0 -VCC
-VCC0
R4
20
+VCC
R5
20
+VCC
V
0
V410Vac
Q2
Q2N3904
+VCC
00
0
U1uA741
3
2
7
4
6
1
5+
-
V+
V-
OUT
OS1
OS2
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Waveform after PWM
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Low Pass Filter
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Waveform After Low-Pass Filter
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Transformer
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Waveform After Transformer
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Frequency Counter
A frequency counter will connect to the circuit after the low
pass filter and measure the frequency of the AC signal being
outputted to the voltage amplifier. This device will display
the frequency of the power it is sampling on a LCD screen.
Figure 8 shows a picture of the frequency counter that willbe purchased.
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Product Design
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Strobe Light System
Figure 10: Strobe Light Schematic (Vinyl Engine)Figure 11: The strobe light shinning
on the special disc. (Vinyl Engine)
The strobe system will be used to measure the the RPMof the turn-table. As the picture shows, there are three
different circles for the three rates, 33 1/3, 45, and 78.
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Personal Requirements
Name Task 1 Task 2 Task 3 Task 4 Task 5 Task 6 Task 7 Task 8 Totals
Reinhardt, Dave 1 7 40 6 5 4 5 24 92
Kilzer, Jason 1 10 42 3 5 2 5 18 86
Nation, Nick 1 7 40 3 5 6 5 18 85
Shriver, Matt 1.5 6 40 3 5 6 5 20 86.5Total (hours) 4.5 30 162 15 20 18 20 80 349.5
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Other Resource Requirements
Item Team Hours Other Hours Cost
Miscellaneous Parts & Materials 0 0 $20.00
Device Components 2 0 $65.94
Project/Poster Printing 5 0 $0.00Total 7 0 $85.94
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Financial Requirements
Item W/O Labor With Labor
Miscellaneous Parts & Materials $20.00 $20.00
Device Components $65.94 $65.94
Project/Poster Printing $0.00 $40.00
Subtotal $85.94 $125.94
Labor at $15.00 per hour:
Reinhardt, Dave $1,380.00
Kilzer, Jason $1,290.00
Nation, Nick $1,275.00
Shriver, Matt $1,297.50
Subtotal $5,242.50
Total $85.94 $5,368.44
Schedule
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Schedule
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Deadline Chart
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Design Evaluation
Functionality
Relative
Importance
Evaluation
Score
Resultant
Score
Stablility of frequency 15% 80% 12.00%
Adjustable frequency between 58-62 Hz 25% 100% 25.00%
Accurate strobe light system 5% 60% 3.00%
Safety 15% 100% 15.00%
Precision of .1 Hz 20% 100% 20.00%
User friendly 5% 90% 4.50%
LED display of output frequency 5% 70% 3.50%
Output at least 75W 10% 50% 5.00%
Score 88.00%
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Summary
Upon review of the detailed project design, it has
been decided to continue the project as planned. It
will be continued as scheduled because the
detailed design has meet the functionalrequirements of the precision variable frequency
drive.
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Questions?