Magnetic Bearing Critical Design Review
Team miniMuffin
Lauren Glogiewicz Jacob Beckner Kevin Bodkin James Holley
Philip Terry
Level 0 Functional Decomposition
Phil T.
Level 1 Functional Decomposition
Phil T.
Level 2 Functional Decomposition
Phil T.
Current Control
Jake B.
Iout = -Vin / Rmag
Electromagnets• Electromagnets have inductance as circuit element• Causes initial overshoot and slow rise to desired level• Must be accounted for in design
Rise Time = 20 ns Leveling Time = 2.7 μs
Jake B.
Sensor Circuit
• Sensor output current is based upon the distance away from the object
• Ideal distance to axle from the sensor is between 0.3” - 0.8”
• Beyond this, sensor data will become unreliable
Kevin B.
A/D Converter
• Using microcontroller on-board A/D
• TI MSP430: 4 Channel 10-Bit 200 KSPS
• TI C2000: 7 Channel 12-Bit 4.6 MSPS
Kevin B.
Software FD
Kevin B.
8-12 bits per magnet sent to
current control via FPGA I/O
Convert distance error to current
8x sensor distance in to FPGA
Microprocessor / FPGA
Two possible microcontroller / FPGA controllers:
• TI C2000o Up to 60 MHzo Supports I2C and SPIo On board A/D Converters
• Altera DE2 Boardo Up to 50 MHzo 80 GIO Pinso Ability to apply control in parallel
James H.
D/A Converter• TI DAC7576
o 8 channel, 12 bitso Up to 2.3 MHz communication speedo I2C synchronous communication will be used
James H.
Magnet Test Bed
James H.
Magnet Test Bed
James H.
Timeline
• Milestone 1o Floating 1D concepto Focus on feedback loop design and interface
• Milestone 2o 2D axle built and working
• Expoo Fully 3D axle with horizontal stabilization
Lauren G.
Updated Budget
• We have received $1000 from UROP• We will still apply for the EEF Grant
Item Part No. Cost Quantity Total Cost
Electromagnets EM 200 $ 41.61 15 $ 624.15
Optical Sensors Sharp GP2Y0D805Z0F $ 3.70 15 $ 55.50
BJT $ 0.38 25 $ 9.50
Op Amps $ 1.00 25 $ 25.00
Capacitors $ 0.60 20 $ 12.00
Resistors $ 0.60 20 $ 12.00
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 $ 60.00 3 $ 180.00
Shipping and Handling $ 10.00 6 $ 60.00
Posters/Presentation $ 70.00 1 $ 70.00
Total $ 1,397.11
Lauren G.
Questions?
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