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Magnetic Bearing

Preliminary DesignReview

Team miniMuffin

Lauren Glogiewicz

Jacob BecknerKevin BodkinJames HolleyPhilip Terry

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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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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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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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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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Major Components

Optical Sensors

FPGA: Hardware & Software Interface

Current Control

Electromagnets

Power Supply

Jake

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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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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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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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Questions?