如今，大多数伺服驱动使用采样电阻和线性光耦搭建的一路电流采样电路，如图1所示。其中，rsense是功率型采样电阻，mc34081为运算放大器，78l05为三端稳压电源。hcpl-7840为线性光耦，其2,3引脚为信号输入端，6,7引脚为信号输出端，在输入端输出端供电电压均为5v的情况下，当2,3引脚输入的差值电压变化时，6,7引脚的输出信号将随着输入信号分别进行递增和递减的线性变化。由图1所示可知，

减速电机   电机：TBS80B4 减速机N:6033351 NMRV-P090 B3-B6-B7-B8 I:100
液压泵，数量：1台，型号：PV140R1K1T1NMR1，品牌：Parker ?
各1
WS-X6748-SFP      1
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当伺服电机正常工作时，将采集通过绕组的电流信号转变为采集采样电阻两端电压值，并将该电压值通过线性光耦进行隔离放大，再经过运算放大器，a/d转换送给dsp进行数据分析，进而实现电流环闭环控制。在实际实验过程中，由于伺服电机等外界条件干扰，dsp所接收到的电流采样信号会有相对较大程度的干扰，故必须在电路中增加相应的滤波措施。

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HPF-D002 
HPF-D010-H
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SGMPH-04AAA2C
AB MPM-B2153F-MJ72AA .    19面价 50924 
MPL-B4530K-MJ72AA    19面价19720
伺服电机 ??1FK7083-2AF71-1UA0
 电机M2BAX 225 SMA 4 IMB/1M1001 ???ABB ??1台
变量泵    型号：PVP16362R212 3600PSI  Parker 
变量泵   PV016R9K1T1NMMCK0075  Parker

柱塞泵     油研 A3H145-FR01KK-10
柱塞泵    力士乐REXROTHR 902449059 A A10VSO140 DRS/32R-VPB22U299