基本信息:
- 专利标题: MAGNETOELASTIC LOAD CELL
- 专利标题(中):磁性载体电池
- 申请号:PCT/US2000/006450 申请日:2000-04-10
- 公开(公告)号:WO00063662A1 公开(公告)日:2000-10-26
- 主分类号: G01L1/12
- IPC分类号: G01L1/12 ; G01L3/10 ; G01L3/02
摘要:
A magnetoelastic load cell for providing an output signal indicative of a force applied to the load cell comprises a magnetoelastically active, ferromagnetic, magnetostrictive disk-shaped member having upper and lower surfaces and comprising a central hub, an annular rim and at least two slots formed therebetween for defining at least two generally spiral-shaped spokes extending between the upper and lower surfaces, each of the spokes traversing approximately 360 DEG between its origin at the hub and its termination at the rim. The spokes are magnetically polarized in a single circumferential direction and possess sufficient magnetic anisotropy to return the magnetization in the spokes, following the application of a force to the load cell, to the single circumferential direction when the applied force is reduced to zero. Magnetic field sensor means are mounted proximate to the member to sense the magnitude of the magnetic field produced by the member in response to the applied force. The member is formed of a polycrystalline material wherein at least 50 % of the distribution of local magnetizations lie within a 90 DEG quadrant symmetrically disposed around the single circular direction and has a coercivity sufficiently high that the field arising from the member does not magnetize proximate regions of the member to give rise to parasitic magnetic fields which are of sufficient strength to destroy the usefulness, for force sensing purposes, of the net magnetic field seen by the magnetic field sensor means.
摘要(中):
用于提供指示施加到测力传感器的力的输出信号的磁弹性测力传感器包括具有上表面和下表面的磁弹性有源铁磁性磁致伸缩盘形构件,并且包括中心毂,环形边缘和形成的至少两个槽 在它们之间用于限定在上表面和下表面之间延伸的至少两个大致螺旋形的辐条,每个辐条在轮毂的起点和轮辋端部之间横穿大约360°。 轮辐在单个圆周方向上被磁极化,并且当施加的力减小到零时,具有足够的磁各向异性,以在向负载传感器施加力之后将辐条中的磁化返回到单个圆周方向。 磁场传感器装置靠近构件安装,以响应于所施加的力来感测由构件产生的磁场的大小。 该构件由多晶材料形成,其中至少50%的局部磁化分布位于围绕单一圆形方向对称设置的90°象限内,并具有足够高的矫顽力,使得由构件产生的场不会磁化近邻区域 以产生具有足够强度的寄生磁场,以破坏由磁场传感器装置看到的净磁场的用于力感测的目的。
IPC结构图谱:
G | 物理 |
--G01 | 测量;测试 |
----G01L | 测量力、应力、转矩、功、机械功率、机械效率或流体压力 |
------G01L1/00 | 力或应力的一般计量 |
--------G01L1/12 | .通过测量施加应力引起的材料磁性质的变化 |