Magcam @ SENSOR+TEST 2022

From 10 to 12 May
Nuremberg, Germany
Booth 1-417


From 10 to 12 May, Magcam will be present at SENSOR+TEST 2022, the leading forum for sensors, measuring, and testing technologies worldwide.
Visit us at booth 1-417 at the Nuremberg Exhibition Centre to meet our experts in person and discover our latest Magcam's magnetic field scanner, Combi Scanner, and the latest MagScope data analysis software features.

Conference: ITG/GMA- Fachtagung Sensoren und Messsysteme 2022

Sensor magnet quality control using a magnetic field camera
Speaker: Koen Vervaeke, CEO of Magcam
Where: Room Foyer, NCC West, Level 2 at Nürnberger CongressCenter
When: between 17:45 to 19:00 on the 10th of May 2022


A method is presented for magnetically characterizing 2-pole rotary encoder magnets, which are widely used in angular encoders e.g. electric motors and rotary positioning systems. The method uses a proprietary ‘Distance Filter’ algorithm, which allows to extrapolate a magnetic field distribution recorded at one certain (close) distance above a magnet or magnet assembly to another (larger) distance in a very fast way and with strong suppression of measurement noise. This allows very fast and at the same time highly accurate measurements, making the method suitable for production quality control.

The ‘Distance Filter’ extrapolation algorithm is used in combination with Magcam’s magnetic field camera systems. When the extrapolation is in the direction away from the magnet, there is a strong suppression of noise, resulting in µTesla magnetic field resolutions. This makes the Distance Filter algorithm very powerful for determining magnetic field distributions far away from a magnet since a direct measurement at a farther distance would suffer from a poorer signal-to-noise ratio.

In typical end applications, a Bx,By sensor is positioned in the center of the rotary encoder magnet at a certain distance from the magnet surface, which is typically several mm. At such distance, the Bxy magnetic field is typically of the order of 50mT. The Bx,By sensor then measures Bx and By and from those calculates the in-plane angle of the magnetic field using atan2(By,Bx). Inhomogeneities of the magnetic field distribution can cause errors on this measured angle value. During quality control on such magnets, this angle error needs to be determined with high accuracy, typically in the order of 0.1° or better. By using a magnetic field camera in combination with the Distance Filter this can be achieved in a superior way.
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Nuremberg, Germany