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 / FPGATwo 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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