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    • 3. 发明授权
    • Air gap matching proximity sensor for magnetic bearings
    • 气隙匹配接近传感器用于磁性轴承
    • US5036236A
    • 1991-07-30
    • US520000
    • 1990-05-07
    • Douglas W. Wilson
    • Douglas W. Wilson
    • F16C39/06
    • F16C32/047F16C32/0446
    • A pricisely dimensioned gap between relatively movable surfaces (14,16) is maintained in a magnetic bearing by use of proximity sensors (22a, 22b, 23a, 23b). Each sensor includes a magnetic assembly (32) having a bar core (36) secured to a middle leg (42) of an F-shaped core (34). The bar core and the vertical leg (38) of the F-shaped core have approximately equal lengths. The magnetic assembly is fixed with respect to one of the surfaces (16) and is so positioned that the end (52,54) of the F-core vertical leg (38) and the bar core are spaced from the other surface (14) to provide the variable gap dimension. The end (48) of the suppermost leg (40) of the F-shaped core is spaced from the bar core and provides a reference dimension (44). Any differences in the variable gap and reference dimensions are furnished to a driver (27, 72-86) which moves one surface with respect to the other until the gap dimension corresponds to the reference dimension. By making the magnetic materials of the F-core and the bar core the same, the magnetic path lengths approximately the same and the permeability of the magnetic material high over the desired temperature range, by matching the sensor housing temperature coefficient with that of the core, the differential reluctance of the two parallel paths is mode inherently insensitive to temperature changes. Accordingly, the sensor null displacement becomes solely determined by the condition where the clearance between the moving and fixed parts is equal to the reference gap.
    • 通过使用接近传感器(22a,22b,23a,23b),可相对移动的表面(14,16)之间的尺寸较小的间隙保持在磁性轴承中。 每个传感器包括磁性组件(32),其具有固定到F形芯(34)的中间支脚(42)的杆芯(36)。 F形芯的棒芯和垂直腿(38)具有大致相等的长度。 磁性组件相对于一个表面(16)固定,并且被定位成使得F型芯垂直支腿(38)和杆芯的端部(52,54)与另一表面(14)间隔开, 以提供可变间隙尺寸。 F形芯的最上端(40)的端部(48)与条形芯间隔开并提供参考尺寸(44)。 将可变间隙和参考尺寸的任何差异提供给驱动器(27,72-86),该驱动器相对于另一个移动一个表面,直到间隙尺寸对应于参考尺寸。 通过使F芯和棒芯的磁性材料相同,通过将传感器壳体的温度系数与芯的温度系数相匹配,磁路长度大致相同,磁性材料的磁导率在期望的温度范围内高 ,两个并联路径的差分磁阻是对温度变化固有地不敏感的模式。 因此,传感器零位移仅由运动部件和固定部件之间的间隙等于基准间隙的条件决定。