Invention Grant
US09354084B2 Off-axis magnetic field angle sensors 有权
离轴磁场角传感器

Off-axis magnetic field angle sensors
Abstract:
Embodiments relate to magnetic field angle sensing systems and methods. In an embodiment, a magnetic field angle sensing system configured to determine a rotational position of a magnetic field source around an axis, comprises N sensor devices arranged in a circle concentric to an axis, wherein N>1 and the sensor devices are spaced apart from one another by about (360/N) degrees along the circle, each sensor device comprising a magnetic field sensing device having a sensitivity plane comprising at least one reference direction of the magnetic field sensing device, wherein the magnetic field sensing device is sensitive to a magnetic field component in the sensitivity plane and configured to provide a signal related to a (co)sine of an angle between the reference direction and the magnetic field in the sensitivity plane; and circuitry coupled to the N sensor devices and configured to provide a signal indicative of a rotational position of a magnetic field source around the axis determined by combining the signals from the magnetic field sensing devices of the N sensor devices.
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