EDGE™ Centering Magnet Device P08028 By: Aaron Burger

EDGE™ Concept Level Project Plan Project Name –Magnet Centering Device Project Number –P08028 Project Family –Artificial Organ Engineering Start Term – End Term – Faculty Guide –Dr. Steven Day (Mechanical Engineering) Faculty Consultant –Prof. John Wellin (Mechanical Engineering) Faculty Consultant –Dr. Matthew Marshall (Industrial Engineering)

EDGE™ Confidential Disclosure Agreement

EDGE™ The LVAD Heart Pump The LVAD is … a device which assists the heart in the circulation of blood throughout the body a pump that is mechanically bearing free, therefore the longevity is significantly greater than current heart pumps. has a rotor which is levitated and held axially in place by magnets and needs to have the bushings and magnetic fields to the rotor be concentric to the rotor’s radial position

EDGE™ Why center the rotor’s components? The LVAD heart pump is levitated using magnets The positioning of the LVAD’s rotor is done by monitoring the magnetic field of magnets Creating a concentric magnetic field is crucial in the success of the LVAD heart pump Because the magnets are placed on bushings, having bushings concentric to the diameter is also key in the success

EDGE™ Proposed Designed 1.Center the bushings using a laser and sensor which can map the bushings concentricity and move the materials accordingly. 2.Place a magnet on the centered bushing, then map the magnetic field and move magnet accordingly. 3.Process of centering both the magnetic field and bushing is completely automated. 4.Time of production is lessened. 5.First step in the mass production of the LVAD heart pump

EDGE™ Current Method of Centering Magnets Linear Stages Magnet pusher & magnet Sensor

EDGE™ Hall Effect Magnet & Sensor Sensor Hall Magnet

EDGE™ Sensitivity of HESA on the X-axis Voltage X-axis

EDGE™ Illustration of a non-concentric magnetic field Magnetic Field Sensor Magnet y-axis x-axis

EDGE™ Pushing the magnet Sensor A force physically moving the magnet

EDGE™ New position with a concentric magnetic field After the magnet has been physically moved the magnetic field is concentric with the sensor

EDGE™ Current Method of Centering Bushings Dials which read the position of the bushing

EDGE™ Laser Calipers SensorLaser Bushing

EDGE™ Laser Caliper cont. SensorLaser A force to physically move the bushing

EDGE™ Laser Caliper cont. SensorLaser Bushing is concentric with the diameter

EDGE™ Risks & Constraints Implementing a working LabVIEW program Machining Integration of systems (Sensors & Positioning) Motor Control System Linear Slides & Stages: –Backlash –Hysteresis –Accuracy –Uni-Directional Repeatability –Bi-Directional Repeatability

EDGE™ Staffing Requirements Mechanical Engineer 1.) Team manager, responsible for organizing the meetings and setting up team with materials and resources. Documentation of the progress of the project is an essential part of the manager’s responsibility. In addition to these tasks, the manager will assist others in their assignments. 2.) The mechanical engineers should be comfortable in the machine shop. Possess the ability to machine precise parts for the test rig, because a concentricity of 10 microns is needed. The precision of machining is essential in the success of this project. In addition to machining, the mechanical engineers input and ideas are important in the designing of a new centering test rig. Because a test rig already exists, persons with ingenuity and imagination will help in the designing of a new test rig. 3.)The mechanical engineers need to be comfortable with a computer aided design software, SolidWorks or AutoCad. As the project progresses, an organized drawing package needs to be assembled and a bill of materials needs to documented for the budgetary purposes. As the designing of parts becomes less frequent, the role of these engineers will be assisting others with various operations for this project such as the LabVIEW programming, circuitry and machining.

EDGE™ Staffing Requirements cont. Electrical Engineers 1.)Having an electrical engineer familiar with motion controls and sensory positioning is a crucial function for this project. Because controlling the motion and position of the bushing and magnet through a computer software and sensors, the electrical engineer needs to control the voltage and current from these sensors and motion devices to ensure an accurate and repeatable process. The electrical engineer will provide the wiring necessary to power the different devices on the test rig. Industrial Engineer 1.)Implement test procedures to insure that the precision and specs. are met. The documentation of the process and procedures will provide crucial information that will help in the success of the project. Statistical analysis performed by the industrial engineer will provide a design of an experiment data for the finished test rig and provide a liability analysis on the purchased parts.

EDGE™ Week 1 Introduction to the LVAD Heart Pump –how the heart pump works –give team reports related to the LVAD project and current magnet centering device –have team sign confidential disclosure agreement Have team perform a centering test on a magnet and get a feel for the current test rig Benchmark the current test rig –identify all the parts on the current test rig –illustrate the problems with the current test rig

EDGE™ Week 2 Have team members split up into areas of their concerns: 1. Mechanical Engineers – research linear stages and slides; come up with ways of correcting problems with them 2.Electrical Engineer – research methods of positioning and instituting sensors for that purpose. Get familiar with LabVIEW 3.Industrial Engineer – research ways on organizing material for test protocols and procedures. Compile the research at the end of the week and start designing a magnet centering device.

EDGE™ Week 3 Having brainstormed the team member’s reports and initialized a design of the device, ask certain professors for their opinions and inputs on the team’s decisions. Dr. Day – opinion on test rig design ideas Dr. Marshall – Statistical Analysis of test and liability analysis of purchased parts Prof. Wellin – LabVIEW Programming Machine Shop for machining advice

EDGE™ Resources Needed Computer with programming capabilities, i.e. LabView, SolidWorks, AutoCad, Cadence etc. Area for designing and building of test rig Machine shop equipment and supplies Measuring instruments Motor controls, linear slides, laser calipers or laser positioning devices More will be added as time progresses