Design Review PP (12-1)

8/3/2019 Design Review PP (12-1)

1/38

Precision Variable Frequency Drive

Group May07-13

Jason KilzerNick Nation

Dave Reinhardt

Matt Shriver

Client: Jim Walker

Faculty Advisor: Professor Ajjarapu


2/38

Precision Variable Frequency Drive

Nick Uses and Constraints

Jason Technology and Overall Design

Matt Detailed Design

Dave Requirements, Schedules, Conclusions


3/38

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.


4/38

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.


5/38

Operating Environment

Indoors

No extreme dust No extreme temperatures


6/38

Intended Users and Uses

Users

Avid music listener

Lay person

Uses

Adjust the frequency of the turn-table

With other synchronous motors


7/38

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.


8/38

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


9/38

Design Considerations

Maximum weight and size

Minimum power output

Minimum operating frequency


10/38

Functional Requirements

Synchronous motor frequency controller

Knob controller to adjust frequency

Digital read-out of frequency

Portable strobe system


11/38

Technology Considerations

Pulse Width Modulation

Crystal Oscillator


12/38

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.


13/38

Testing Considerations

Pulse-width modulator

Strobe system

Complete system


14/38

Product Design


15/38

Power Source

110-120 VAC

60 Hz nominal frequency

Standard wall outlet


16/38

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.


17/38

Circuit Simulation via Simulink


18/38

Pulse Width Modulator (PWM)


19/38

Circuit Design of PWM


20/38

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


21/38

Triangle Waveform


22/38

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


23/38

Waveform after PWM


24/38

Low Pass Filter


25/38

Waveform After Low-Pass Filter


26/38

Transformer


27/38

Waveform After Transformer


28/38

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.


29/38

Product Design


30/38

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.


31/38

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


32/38

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


33/38

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


34/38

Schedule


35/38

Deadline Chart


36/38

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%


37/38

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.


38/38

Questions?

Design Review PP (12-1)

Documents

PP-design 2014 - 2015

Journal Review Pp Tanya r

Lit review matrix pp

Us history cst review pp

American revolution review pp

Lesson 1 review of worksheet pp

Design pp #3

One step inequalities partner review pp

DESIGN REVIEW PROCEDURE - ElectraNet...Review (DFDR), Critical Design Review (CDR) and Final Design Review (FDR) are listed in Appendix A Design Review Drawings 3.2 Design Review Record

Age of exploration internet review pp

CARACTER DESIGN / PP

Enhanced Application Review Preliminary Plat (PP)...a. Land Divisions –Subdivision (PP) b. Land Divisions –Master Planned Property (PP) Enhanced Application Review Methodology

Senior Design PP section

Kindergarten Review Pp

12 Review PP

English colonies review pp

Montsaye Academy PP Funding Review Date of Most recent PP ...€¦ · Montsaye Academy PP Funding Review Summary Information School Montsaye Academy Academic Year 2018/19 Total PP

RECYCLABILITY EVALUATION PROTOCOL FOR PP CONTAINERS · PP. Prior to initiating the evaluation, the Applicant shall review the Design for Recycling Guidelines for natural and colored

PP Macro Review-17th Edition

Design pp 1 final