Detailed Design Review Detailed Design Review of Magnetic Field of Magnetic Field Centering DeviceCentering Device

Project # P08028

“Develop a Design and Methodology to Ensure the Concentricity between the

Magnetic Field and Bushings of a Magnetic Bearing.”

Team OrganizationTeam Organization

Project ManagerAaron Burger

(ME)

Jiayi Lu(ME)

Mike Brown(ME)

Dave Falcinelli(EE)

Project BackgroundProject BackgroundNeed for project produced from the LVAD

Heart Pump experiments being conducted by Dr. Steven Day.

LVAD Heart Pump utilizes magnetic bearings to alleviate mechanical wear.

Magnetic bearing assemblies consist of a magnets permanently adhered between bushings.

Proper functionality of magnetic bearing assemblies relies on the concentricity between both bushings and the magnetic field.

LVAD Heart Pump

Rotor Assembly of the LVAD

Hall Magnet Assembly

Purpose of Project

.

The magnetic field is not concentric to the physical diameter of the magnet

The concentricity of the bushings and magnetic field need to be within customer’s specifications

Be adaptable for other magnets of the LVAD Heart Pump

IDEAL MAGNETIC BEARING IDEAL MAGNETIC BEARING Red = MagnetGrey = BushingBlue = Magnetic FieldGreen = Hall Effect Sensor

Red = MagnetGrey = BushingBlue = Magnetic FieldGreen = Hall Effect Sensor

PROPERLY PROPERLY ADJUSTED ADJUSTED MAGNETIC MAGNETIC BEARING BEARING

Red = MagnetGrey = BushingBlue = Magnetic FieldGreen = Hall Effect Sensor

Current Method of Current Method of Assembling Magnetic Assembling Magnetic

BearingsBearings

Associated ProblemsAssociated ProblemsHigh level of maintenance and

calibration required.Low level of automation in process.Amount of time required for proper

assembly of magnetic bearingRepeatability Not the dedicated function of

device.

Statement of ProblemStatement of Problem

Develop a highly autonomous device capable of repeatedly

ensuring concentricity between the magnetic field and bushings of the rotor

assembly.

Customer Needs and Customer Needs and Engineering CorrelationsEngineering Correlations

Customer NeedsCustomer

SpecificationsEngineering

Needs

Concentricity of Magnetic Bearings

Within ± 12 µm in Radial Direction

Tolerances of Device Components must Stack up

to ≤ 12 µm.

Device Components must Provide High Resolution

and Repeatability.

Low Level of Maintainability

NA

Easily Calibrated Device Components

Device Stand/Enclosure must Dampen Minor

Vibrations.

Higher Level of Automation

Maximum Number of User Interactions

= 10

Device Components must be capable of interaction

with computer

Non-Contact Sensors

Adaptability 0.5 – 1.0 in.

Adjustable Radial and/or Axial Positioning of

Sensors/Holding Components

Adequate Measuring Ranges of Sensors/ Travel of Positioning Components

Budget$ 12,000.00 Simplicity of System

COTS

High Level System ConceptHigh Level System Concept

LabView

Controllers DAQ

Positioning andMeasuring Stages

Mag. Bearing Component

Holders

Measurement Sensors

Automated

Adhering/Final

Assembly

Manual

Final Design Concept and Methodology

Flow of System

Schedule for Senior Design II

Current State of DesignSelected design expected to meet high

level customer needs and specifications.- Verification through additional testing

and feasibility assessment.

Design fulfills all engineering specifications

- Further tolerance analysis of system components necessitated.

Current design selection on target to exceed budget

- Revising of off-shelf component selection in progress.

Schedule for Senior Design II