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MMT and Melexis Development Note: Through Shaft 360° Magnetic Rotary Position Sensor
Measurement of angular position using variation of magnetic field amplitude induced by the displacement of a moving magnet has been intensively developed over the last fifteen years. However, these solutions have limits in terms of angular range and temperature influence. Recently, new solutions based on the determination of the angle of a rotating magnetic field have been developed. They allow for a measurement of angles up to 360° with limited temperature influence using sine and cosine signals generated in a plane by a rotating magnet. Typical set-up of these solutions is to use a permanent magnet with a bipolar magnetization placed at one end of a shaft and facing a dedicated Hall ASIC.
However, several applications require a through shaft, which prevents from using the basic principle described hereabove. Therefore, MMT has developed and patented innovative solutions for through shaft magnetic position sensors using measurement of the angle of a rotating magnetic field.
Current Revision:
001
File Type: Application Note
File Size: 523.9 KB
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