TSXCAY42

TSXCAY42

驱动器和系统如何接地?

a.如果在交流电源和驱动器直流总线(如变压器)之间没有隔离的话，不要将直流总线的非隔离端口或非隔离信号的地接大地，这可能会导致设备损坏和人员伤害。因为交流的公共电压并不是对大地的，在直流总线地和大地之间可能会有很高的电压。

b.在多数伺服系统中，所有的公共地和大地在信号端是接在一起的。多种连接大地方式产生的地回路很容易受噪音影响而在不同的参考点上产生流。

c.为了保持命令参考电压的恒定，要将驱动器的信号地接到控制器的信号地。它也会接到外部电源的地，这将影响到控制器和驱动器的工作(如：编码器的5V电源)。

d.屏蔽层接地是比较困难的，有几种方法。正确的屏蔽接地处是在其电路内部的参考电位点上。这个点取决于噪声源和接收是否同时接地，或者浮空。要确保屏蔽层在同一个点接地使得地电流不会流过屏蔽层。

20、减速器为什么不能和电机正好相配在标准转矩点?

如果考虑到电机产生的经过减速器的大连续转矩，许多减速比会远远超过减速器的转矩等级。

如果我们要设计每个减速器来匹配满转矩，减速器的内部齿轮会有太多组合 ( 体积较大、材料多 ) 。这样会使得产品价格高，且违反了产品的小体积”原则。

21、如何选择使用行星减速器还是正齿轮减速器?

行星减速器一般用于在有限的空间里需要较高的转矩时，即小体积大转矩，而且它的可靠性和寿命都比正齿轮减速器要好。正齿轮减速器则用于较低的电流消耗，低噪音率低成本应用。

TSXCAY42 

TSXCAY42

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