[Reference] Effect upon angular accuracy when the magnet rotation center is displaced

The following is an example of simulation for any effect upon angular accuracy when the magnet rotation center is displaced from the sensor center.

<Calculation conditions>

• Magnet size : 5.0 dia. x t2.0 mm, 7.0 dia. x t2.0 mm, 10.0 dia. x t2.0 mm
• Magnet material : Neodymium magnet (Residual magnetic flux density : Br = approx. 1250 mT)
• Gap between magnet and sensor package :
  Gap = 3.2 mm for magnet of 5.0 dia. x t2.0 mm
  Gap = 4.0 mm for magnet of 7.0 dia. x t2.0 mm
  Gap = 5.0 mm for magnet of 10.0 dia. x t2.0 mm
  (These gap dimensions ensure that a flux density of approximately 30 mT is applied to the sensor respectively)
• Magnet rotation : 360° (pitch: 6°)
• Displacement of magnet rotation axis : X = 0 to 0.5 mm
  

As indicated, the effect of magnet rotation axis displacement upon the angular error is generally smaller as the disc magnet diameter is larger.