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    Magnetic Field Sensor For Orientation Independent Speed And Direction Measurement
    22.
    发明申请
    Magnetic Field Sensor For Orientation Independent Speed And Direction Measurement 有权
    磁场传感器用于方向独立的速度和方向测量

    公开(公告)号：US20160356628A1

    公开(公告)日：2016-12-08

    申请号：US14731967

    申请日：2015-06-05

    Applicant: Allegro Microsystems, LLC

    Inventor： Andrea Foletto ,  Andreas P. Friedrich

    IPC: G01D5/14 ,  G01R33/07 ,  G01R33/09 ,  G01D5/16

    CPC classification number: G01D5/142 ,  G01D5/145 ,  G01D5/16 ,  G01R33/072 ,  G01R33/091

    Abstract: A magnetic field sensor that provides target speed and direction detection that is independent of sensor-to-target orientation includes at least three differential channels, each responsive to a pair of magnetic field sensing elements to generate a respective magnetic field channel signal. A combining element is configured to generate a combined signal based on the first, second, and third magnetic field channel, signals and control circuitry responsive to the combined signal and to at least one of the first, second, and third magnetic field channel signals generates a sensor output signal that indicative of target speed and direction.

    Abstract translation: 提供独立于传感器到目标取向的目标速度和方向检测的磁场传感器包括至少三个差分通道，每个差分通道响应一对磁场感测元件以产生相应的磁场通道信号。 组合元件被配置为基于第一，第二和第三磁场通道产生组合信号，响应于组合信号和第一，第二和第三磁场通道信号中的至少一个产生的信号和控制电路 指示目标速度和方向的传感器输出信号。

    Magnetic Field Sensor for Sensing a Movement of a Target Object
    23.
    发明申请
    Magnetic Field Sensor for Sensing a Movement of a Target Object 有权
    用于感测目标物体运动的磁场传感器

    公开(公告)号：US20160123768A1

    公开(公告)日：2016-05-05

    申请号：US14529606

    申请日：2014-10-31

    Applicant: ALLEGRO MICROSYSTEMS, LLC

    Inventor： Andrea Foletto ,  Yannick Vuillermet ,  Andreas P. Friedrich

    IPC: G01D5/14

    CPC classification number: G01D5/14 ,  G01D5/147 ,  G01D5/16

    Abstract: A magnetic field sensor operates as a motion detector for sensing a movement of a ferromagnetic target object having features. The magnetic field sensor has a plurality of magnetoresistance elements to generate, in a first channel, a feature signal indicative of a proximity of a feature of a ferromagnetic target object and, in a second channel, an edge signal indicative of a proximity of an edge of a feature of a ferromagnetic target object.

    Abstract translation: 磁场传感器用作运动检测器，用于感测具有特征的铁磁性目标物体的运动。 磁场传感器具有多个磁阻元件，以在第一通道中产生指示铁磁性目标物体的特征接近的特征信号，并且在第二通道中产生指示边缘接近的边缘信号 铁磁目标物体的特征。

    Use of channel information to generate redundant angle measurements on safety critical applications
    26.
    发明授权
    Use of channel information to generate redundant angle measurements on safety critical applications 有权

    公开(公告)号：US11733024B2

    公开(公告)日：2023-08-22

    申请号：US17363732

    申请日：2021-06-30

    Applicant: Allegro MicroSystems, LLC

    Inventor： Juan Manuel Cesaretti ,  Andrea Foletto

    IPC: G01R33/09 ,  G01B7/30 ,  G01D5/14 ,  G01D18/00

    CPC classification number: G01B7/30 ,  G01D5/145 ,  G01D18/00

    Abstract: A sensor system and method use channel information to generate redundant angle measurements for sensing rotation of magnets about a given axis of rotation. It was observed that magnetic field strength on a circle, centered on the axis of rotation but in a plane perpendicular to it, have a component parallel to the axis that varies sinusoidally as a function of the angle around the circle. By placing magnetic field sensors equiangularly around such a circle, and summing their field strengths with appropriate weights, the angle of magnet rotation may be computed in a manner that is immune to the presence of stray fields. Moreover, fewer than all channels of sense data may be combined to form redundant estimates of the angle of rotation, to permit continued operation when one of the sensors has failed.

    POSITION SENSOR HAVING HARMONIC DISTORTION COMPENSATION
    29.
    发明申请
    POSITION SENSOR HAVING HARMONIC DISTORTION COMPENSATION 有权

    公开(公告)号：US20220187387A1

    公开(公告)日：2022-06-16

    申请号：US17120395

    申请日：2020-12-14

    Applicant: Allegro MicroSystems, LLC

    Inventor： Emanuele Andrea Casu ,  Andrea Foletto

    IPC: G01R33/00

    Abstract: Methods and apparatus for determining a mechanical angle of a target from sine and cosine signals generated by inductive sensing elements by applying harmonic compensation on the sine and cosine signals using possible mechanical angles and analyzing results of the applied harmonic compensation. One of the mechanical angles can be selected based on the results of the applied harmonic compensation. In embodiments, a cost function can be used to select the mechanical angle.

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