Magnetic Bearing Preliminary Design Review Team miniMuffin Lauren Glogiewicz Jacob Beckner Kevin...
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Transcript of Magnetic Bearing Preliminary Design Review Team miniMuffin Lauren Glogiewicz Jacob Beckner Kevin...
Magnetic Bearing Preliminary Design
ReviewTeam miniMuffin
Lauren Glogiewicz Jacob Beckner Kevin Bodkin James Holley
Philip Terry
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
Why Magnetic Bearings?• Eliminates friction present in mechanical bearings
o Higher speed of rotation possibleo Fewer parts require maintenanceo Not as susceptible to heat
VS
Lauren
Project Objectives
Lauren
Concept: 8-Magnet Bearing
Lauren
First Objective: 1D Proof of Concept Design
Lauren
Final Objective: Magnetic Ring Bearing with Axial Bearing
James
Final Objective: Magnetic Ring Bearing with Axial Bearing
James
Hardware Functional Diagram
James
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
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
Major Components• Optical Sensors
• FPGA: Hardware & Software Interface
• Current Control
• Electromagnets
• Power Supply
Jake
Sensing Devices• Optical sensors will track axle position
• Sensors will be paired with electromagnets
• Vital to the positioning feedback loop
Jake
Altera Flex 6000 FPGA
• 199 I/O pinso 8 magnet
control with 12-bit accuracy
• Re-programmable with Altera software
• 100 MHz maximum clock frequency
Jake
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
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
Power Supply
• Need the following: o 15 V for OpAmps o 6 V +/- mV for magnets o 3.3 V for integrated circuits
• Initial work using power supplies & 12 V batteries
• Final design should use wall power
Kevin
Prediction of Material CostsItem Part No. Cost Quantity Total Cost
FPGA 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
Sources of Funding• UROP
• Boettcher Scholar Educational Enrichment Grant
• Engineering Excellence Fund Mini Grant
Phil
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
Timeline
Phil
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
Questions?