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Abstract

A dual Z-axis magnetoresistive angle sensor comprising a circular permanent magnet encoding disc, two Z-axis magnetoresistive sensor chips, and a PCB, two Z-axis magnetoresistive sensors are placed on the PCB. The magnetic sensing directions of the Z-axis magnetoresistive sensors are orthogonal to the substrate. Each Z-axis magnetoresistive sensor chip comprises a substrate and at least one magnetoresistive sensor located on the substrate. The magnetic field sensitive direction of the magnetoresistive sensor is perpendicular to the substrate. The magnetoresistive sensor comprises a flux concentrator and a magnetoresistive sensor unit. The magnetoresistive sensor unit is connected electrically into a push-pull structure. The push arm and pull arm of the magnetoresistive sensor are respectively located at two side positions equidistant from Y-axis central line and above or below the flux concentrator. The circular permanent magnet encoding disc has a magnetization direction parallel to the diameter direction. When the circular permanent encoding disc rotates, a magnetic field measurement angle is calculated via orthogonal magnetic fields measured by the two z-axis magnetoresistive sensor chip. The magnetic field measurement angle can be used for representing a rotation angle of the circular permanent magnetic encoding disc. This dual Z-axis magnetoresistive angle sensor's structure is simple, and it also has the characteristics of high sensitivity and high spatial flexibility.

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