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Transcript of soft ip core
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7/27/2019 soft ip core
1/23
Magnetic Bearing
Preliminary DesignReview
Team miniMuffin
Lauren Glogiewicz
Jacob BecknerKevin BodkinJames HolleyPhilip Terry
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7/27/2019 soft ip core
2/23
Project Description
Different bearing design using magnetic fields
Electromagnets will levitate an axle
Optical sensors monitor position of axle
FPGA interprets data to control electromagnets
System less prone to mechanical restraints
Lauren
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7/27/2019 soft ip core
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Why Magnetic Bearings?
Eliminates friction present in mechanical bearingso Higher speed of rotation possibleo Fewer parts require maintenanceo Not as susceptible to heat
VS
Lauren
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Project Objectives
Lauren
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Concept: 8-Magnet Bearing
Lauren
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First Objective:1D Proof of Concept Design
Lauren
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Final Objective: MagneticRing Bearing with Axial Bearing
James
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Final Objective: MagneticRing Bearing with Axial Bearing
James
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Hardware Functional Diagram
James
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7/27/2019 soft ip core
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8-12 bits per magnet sent to
current control via FPGA I/O
Convert distance error to current
8x sensor distance in to FPGA
Software Functional Diagram
James
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7/27/2019 soft ip core
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Design Constraints Speed of Control
o Need a tight control loop between sensors & FPGAo Electromagnets need to be adjusted continuously
Power
o Electromagnets are typically high powero Bearings only useful if energy efficient
Budget
o Certain components could be expensive
James
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7/27/2019 soft ip core
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Major Components
Optical Sensors
FPGA: Hardware & Software Interface
Current Control
Electromagnets
Power Supply
Jake
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7/27/2019 soft ip core
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Sensing Devices
Optical sensors will track axle position
Sensors will be paired with electromagnets
Vital to the positioning feedback loop
Jake
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Altera Flex 6000 FPGA
199 I/O pinso 8 magnet
control with 12-bitaccuracy
Re-programmable withAltera software
100 MHz maximumclock frequency
Jake
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Electromagnets
Found source of low-cost, high-power magnets
Currently testing two models:
o 1" Magnet: 3 V, 5.5 W, 25 lb holding force
o 2" magnet: 6 V, 7 W, 105 lb holding force
Kevin
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7/27/2019 soft ip core
16/23
Current Control
Will receive information from the FPGA
Information fed to D/A converter to amplifier
Amplifier will feed into BJT-based current source
Will change the strength of the electromagnets
Current limited based on the magnet used
Kevin
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Power Supply
Need the following:o 15 V for OpAmpso 6 V +/- mV for magnetso 3.3 V for integrated circuits
Initial work using power supplies & 12 V batteries
Final design should use wall power
Kevin
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Prediction of Material Costs
Item Part No. Cost Quantity Total CostFPGA Altera FLEX 6000 $43 2 $86.00
Electromagnets EM 200 $41.61 15 $624.15
Optical Sensors Sharp GP2Y0D805Z0F $3.70 15 $55.50
BJT TRANS NPN 10VCEO 5A $0.38 25 $9.50
Op Amps $1.00 25 $25.00
Capacitors $0.60 100 $60.00
Resistors $0.60 100 $60.00
High Power Diodes $1.71 15 $25.65
Wire Wire T Lead Plastic 22AG $18.00 5 $90.00
Nuts, Bolts, Screws Aluminum (25 pack) $9.58 3 $28.74
Aluminum 6ft x 1/4" x 2" $30.22 1 $30.22
Machining $200.00 1 $200.00
PCB $60 3 $180.00
Shipping and Handling $10.00 6 $60.00
Posters/Presentation $70 $70
Total: $1,600.76
Phil
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Sources of Funding
UROP
Boettcher Scholar Educational Enrichment Grant
Engineering Excellence Fund Mini Grant
Phil
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7/27/2019 soft ip core
20/23
Division of Labor
For preliminary steps, we will divide as follows:
o Jake: Interfacing/ programming FPGA
o James: Electromagnets and supporting electronics
o Kevin: Power electronics
o Lauren: Mechanical design
o Phil: Sensors and documentation
Phil
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Timeline
Phil
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Risks and Contingency Plan
Mechanical Problems
o Some parts manufactured by other people
Time delay of sensors
o Look into components with faster responseo Different sensing types: capacitive, magnetic field, etc.
Time delay of current control
o Better components
Phil
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7/27/2019 soft ip core
23/23
Questions?