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编码器把角位移或直线位移转换成电信号，
前者称为码盘，后者称为码尺。按照读出方式编码器可以分为接触式和非接触式两种；按照工作原理编码器可分为增量式和式两类。
增量式编码器是将位移转换成周期性的电信号，再把这个电信号转变成计数脉冲，用脉冲的个数表示位移的大小。
式编码器的每一个位置对应一个确定的数字码，因此它的示值只与测量的起始和终止位置有关，而与测量的中间过程无关。
意大利Eltra编码器主要分类：意大利Eltra编码器可按以下方式来分类。
1、按码盘的刻孔方式不同分类(1)增量型:就是每转过单位的角度就发出一个脉冲信号(也有发正余弦信号，
然后对其进行细分，斩波出频率更高的脉冲)，
通常为A相、B相、Z相输出，A相、B相为相互延迟1/4周期的脉冲输出，
根据延迟关系可以区别正反转，而且通过取A相、B相的上升和下降沿可以进行2或4倍频；Z相为单圈脉冲，即每圈发出一个脉冲。
值型:就是对应一圈，每个基准的角度发出一个*与该角度对应二进制的数值，通过外部记圈器件可以进行多个位置的记录和测量。
2、按信号的输出类型分为:电压输出、集电极开路输出、推拉互补输出和长线驱动输出。
3、以编码器机械安装形式分类(1)有轴型:有轴型又可分为夹紧法兰型、同步法兰型和伺服安装型等。
(2)轴套型:轴套型又可分为半空型、全空型和大口径型等。4、以编码器工作原理可分为:光电式、磁电式和触点电刷式。
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