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电位器式传感器的结构与设计
发布日期:2012-12-12 16:31:09

 电位器是由电阻丝元件、滑动臂及骨架等部分构成。所以,电位器式传感器的设计主要是根据实际需要选择合适的电阻丝、电刷和月架。
   (1)电阻丝。对电阻丝的要求是:电阻系数大,温度系数小,有足够的强度和良好的延展性,对铜的热电势要小,耐磨、耐腐蚀,焊接性能好,能承受较高的温度。常用的材料有:康铜丝、9铬丝、卡玛丝期铱合金等。
   (2)电刷。由电刷构成在电阻丝上运动的滑动臂。它通常由电刷触头、电刷留、导向和轴承装置等构成;其质量好坏将直接影响噪声及工作可靠性:对电刷触头的要求是:有良好的抗氧化能力,接触电势要小,商一定的接触力(一般为0.005N)

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