SLYU064A June   2023  – December 2023 TMAG3001 , TMAG5170 , TMAG5170-Q1 , TMAG5170D-Q1 , TMAG5173-Q1 , TMAG5253 , TMAG5273

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Joystick Design
    1. 2.1 Establishing Form Factor
      1. 2.1.1 Choosing Mechanical Implementation
      2. 2.1.2 Choosing Magnetic Implementation
    2. 2.2 Magnet Sensor Placement
    3. 2.3 Design Calculations
    4. 2.4 Post Processing
    5. 2.5 Prototyping and Bench Testing
    6. 2.6 Error Sources
      1. 2.6.1 Mechanical Hysteresis
      2. 2.6.2 Nearby Material Influence
      3. 2.6.3 Fulcrum Slippage
      4. 2.6.4 Offset
  6. 3Lever Design
    1. 3.1 Establishing a Form Factor
      1. 3.1.1 Choosing Mechanical Implementation
    2. 3.2 Magnet Sensor Placement
    3. 3.3 Design Calculations
    4. 3.4 Prototyping and Bench Testing
    5. 3.5 Error Sources
  7. 4Summary
  8. 5References
  9. 6Revision History

2.6.2 Nearby Material Influence

As mentioned in the list of errors, nearby materials can influence measurements. Highly permeable materials like iron, cobalt, nickel, and steel can not only redirect field through the path of least reluctance, but can also resist demagnetization associated with magnet movement. In an ANSYS transient simulation we are able to observe that if the magnet and sensor are placed close to a structure made out of a permeable material like nickel, hysteresis can be observed when the direction of movement is reversed as indicated in Figure 2-23.

GUID-20230518-SS0I-JNS1-9HVZ-3GRN2XKNF4H2-low.svg Figure 2-23 Magnetic Hysteresis