公开(公告)号：US09347799B2

公开(公告)日：2016-05-24

申请号：US14177994

申请日：2014-02-11

Applicant: NXP B.V.

Inventor： Alexé Levan Nazarian ,  Frederik Willem Maurits Vanhelmont ,  Jacobus Josephus Maria Ruigrok

IPC: G01B7/14 ,  G01R33/09 ,  G01D5/14

CPC classification number: G01D5/147 ,  G01D5/145 ,  G01R33/09

Abstract: It is described a magnetic field differential sensor system for measuring rotational movements of a shaft. The described magnetic field sensor system (200) comprises (a) a biasing magnet (210, 510) configured for generating a biasing magnetic field; (b) a magnetic wheel (230) having a wheel axis and a circumferential surface which comprises a regular structure of teeth (231) and gaps (232) arranged in an alternating manner, wherein (i) the magnetic wheel (230) is attachable to the shaft and (ii) the magnetic wheel (230) can be magnetized by the biasing magnetic field; and (c) a magnetic sensor arrangement (220) comprising four magnetic sensor elements (221, 222, 223, 224) being connected with each other in a Wheatstone bridge configuration. Respectively two of the magnetic sensor elements (221, 222, 223, 224) are assigned to one half bridge of the Wheatstone bridge. Further, the four magnetic sensor elements (221, 222, 223, 224) are arranged within an y-z plane, wherein an x-axis, a y-axis and a z-axis define an orthogonal Cartesian coordinate system in which (i) the x-axis is oriented parallel with the wheel axis of the magnetic wheel (230), (ii) the y-axis is oriented tangential to the circumferential surface of the magnetic wheel (230), and (iii) the z-axis is the symmetry line through the center of the biasing magnet (210, 510) and the center of the magnetic wheel (230). The magnetic sensor elements can be hall sensor elements or magnetoresistive sensor elements (221, 222, 223, 224).

Abstract translation: 描述了用于测量轴的旋转运动的磁场差分传感器系统。 所描述的磁场传感器系统（200）包括（a）被配置为产生偏置磁场的偏置磁体（210,510）; （b）具有车轮轴线和圆周表面的磁轮（230），其包括以交替方式布置的规则结构的齿（231）和间隙（232），其中（i）磁轮（230）可附接 （ii）磁轮（230）可被偏置磁场磁化; 和（c）包括以惠斯通电桥配置彼此连接的四个磁性传感器元件（221,222,223,224）的磁传感器装置（220）。 分别将两个磁传感器元件（221,222,223,224）分配给惠斯通电桥的一个半桥。 此外，四个磁性​​传感器元件（221,222,223,224）被布置在yz平面内，其中x轴，y轴和z轴限定正交笛卡尔坐标系，其中（i） x轴与磁轮（230）的车轮轴平行，（ii）y轴定向成与磁轮（230）的圆周表面相切，并且（iii）z轴是 通过偏置磁体（210,510）的中心和磁轮（230）的中心的对称线。 磁传感器元件可以是霍尔传感器元件或磁阻传感器元件（221,222,223,224）。