P08028: Magnet Centering Device
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Information to the Current Test Rig

Table of Contents

Introduction

The current centering device for the bushings and magnets has several flaws which cause problems for the LVAD heart pump. The following page illustrates how the current test rig is used. A step by step procedure of the process in centering the bushings and magnets has been documented and provided.

MBTR Test Rig

Current Test Rig for Centering Magnets

Current Test Rig for Centering Magnets

Physically holding the bushings and magnet

Brass fixtures, bushings and magnet

Brass fixtures, bushings and magnet

Step 1

This is the first procedure to the centering of magnets. Because the test rig has 5 degrees of freedom, the linear slide are not aligned therefore before each test a person needs to adjust the stages aligning the slides using a precision machined rod to insure that the slides are aligned. This is time consuming and cumbersome.

 Aligning the Linear Slides

Aligning the Linear Slides

Step 2

The next step is determining the physical run out of the bushing and magnet. The purpose of this is to determine how off center the bushing and magnet are from the axis of rotation. The problem with this step is human error in reading both dial indicators and recording there value.

 View of dial indicators on test rig

View of dial indicators on test rig

 Close up of dial indicators

Close up of dial indicators

Step 3

Once the physical run out of the bushing and magnet have been determined. The magnet is ready to be mapped using the HESA sensors and pushed. This process is time consuming because it is repeated many times to insure the magnet's magnetic field is concentric to the axis of rotation
 HESA sensors and Pusher

HESA sensors and Pusher

 HESA Sensor Array

HESA Sensor Array

 Picture device used to push the magnet

Picture device used to push the magnet