Centering Magnet DeviceP08028

A.BurgerJ. Lu

D. FalcinelliM. Brown

Order of Presentation

1.) Introduction of existing device2.) Problems with the existing device3.) Customer's Needs4.) Break-up device into sub-assemblies5.) In depth details of sub-assemblies6.) Different combinations of different sub-

assemblies7.) Design concept decided on

Introduction of Existing Device

Step 1.

Bushing and Magnet holding Fixture

Dial Indicators used to measure the magnet and bushing position

A closer look at the positioning process

Magnet mapping sensors and pusher assembly

Hall Effect Sensors

Physical device used to push the magnet

Process of Mapping and Pushing the Magnet

1. Aligning linear stages 2. Determining the position of the bushing and magnet using

the dial indicators3. Rotating the entire assembly and mapping the magnetic

field4. Calculating the max and min of the magnetic field and

determine the location of the maximum value5. Rotating the magnet and bushing assembly to the

maximum location 6. Move assembly to the pushing device where it moves the

magnet7. This process is repeated until the magnetic field and

bushing are concentric to 20 microns

Issues with this process

• Manual process involved• Physically measuring the position of parts• Human error• Indicator being destroyed • Holding magnet and bushing• Pushing the magnet• Moving parts

Customer Need’s

Sub Assemblies

• Assemblies Orientation• Physically holding parts• Measuring parts• Mapping magnetic field• Centering magnet• Adhering magnet to bushing• Confirming and validating

Assembly Orientation

Vertical or horizontal

Holding Fixture: Pugh Chart

Holding Component

• Post • Chuck• Combination of both

Measuring and mapping parts

• Hall effect sensors will measure the magnetic fields, choices to be decides from are: – A single sensor which moves– An array of sensors

• The position of the bushings:– Will not involve a human operator – Will not touch the components

Centering Magnets

• Option 1– Having the entire bushing/magnet assembly move

towards a physical device like the existing device• Option 2– Move a physical device towards the bushing/magnet

assembly• Option 3– A bushing which is stationary and a bushing that moves

• Option 4– A magnet which is stationary and a bushing that moves

Adhering

• Automated gluing • Heat activated composites• UV activated• Ultra sonic• Applying a pressure to the centered assembly

then gluingThis sub assembly will be determined once the

holding and centering of magnet are chosen

Design concept decided on

• The magnet/bushing assembly will be vertical• An array of Hall Effect sensors will be implemented• Option 4: having the magnet stationary while

moving the bushing

Why this configuration

• Vertical eliminates gravity• No gravity eliminates forces • An array eliminates a moving element• The magnetic field be the reference point• Magnet centers change from magnet to

magnet, bushings do not

Different configurations

• Magnet above bushing• Magnet below bushing• Bushing is placed on magnet, manually

Magnet held in place on top

Magnet held in place on bottom