Differential Magnetic Field Sensing for Stray-Field-Immune Rotation Detection

The patent implements a universal sensor device that can accurately sense magnetic fields for targets with various pole pair sizes by incorporating multiple clusters of magnetic field sensing elements. Each cluster is positioned at a different distance from the target, allowing the sensor to adapt to different target characteristics without requiring multiple specialized devices. This multi-functional design enables a single sensor to replace what would traditionally require multiple sensors with specific spacings configured for different applications.

The sensor device divides the sensing function into multiple clusters of magnetic field sensing elements positioned at different distances from the target. Each cluster can be independently coupled to sense magnetic fields, and the segmented structure allows the system to handle various target characteristics by selecting or combining appropriate clusters. This segmentation enables flexible configuration while maintaining accurate measurement across different application scenarios.

The patent creates a universal sensor device that can interface with targets having different pole pair sizes and characteristics through its multiple clusters of magnetically coupled sensing elements. This single versatile device eliminates the need to manufacture and stock multiple specialized sensor variants, thereby reducing manufacturing complexity and cost while maintaining broad adaptability across different target types and applications.

The patent combines multiple sensing clusters with different spacings into a single integrated sensor device. By merging what would traditionally be separate sensor products into one unified device, the patent achieves both adaptability to various targets and manufacturing efficiency, as only one device type needs to be produced rather than multiple specialized versions.

The patent segments the sensing function across multiple clusters positioned at different distances from the target. The closer clusters capture stronger target-generated magnetic field signals, while the farther clusters are less affected by environmental stray fields. By combining the outputs of these segmented sensing elements through magnetic coupling, the system achieves both stray field immunity and adequate signal strength, preventing information loss.

The patent converts the potential harm of stray field interference into a benefit by using the differential positioning of multiple clusters. The clusters at different distances respond differently to stray fields versus target-generated fields, and by combining their signals appropriately, the system enhances its ability to reject stray fields while maintaining sensitivity to the target signal, thus improving precision without losing information.