编码器AB两相2500ppr怎么变成10000 ppr？希望得到计算过程万分感谢。

完美person 2016-12-01 08:21:04 442 浏览

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aaa_001001 2016-12-01 21:25:02

前面介绍了，增量编码器码盘是由很多光栅刻线组成的，有两个（或4个，以后讨论4个光眼的）光眼读取A，B信号的，刻线的密度决定了这个增量型编码器的分辨率，也就是可以分辨读取的Z小变化角度值。代表增量编码器的分辨率的参数是PPR，也就是每转脉冲数，例如每圈刻线360线，A，B每圈各输出360个脉冲，分辨率参数就是360PPR。那么这个编码器可分辨的Z小角度变化量是多少度呢？就是1度吗？增量编码器的A/B输出的波形一般有两种，一种是有陡直上升沿和陡直下降沿的方波信号，一种是缓慢上升与下降，波形类似正弦曲线的Sin/Cos曲线波形信号输出，A与B相差1/4T周期90度相位，如果A是类正弦Sin曲线，那B就是类余弦Cos曲线。对于方波信号，A，B两相相差90度相（1/4T），这样，在0度相位角，90度，180度，270度相位角，这四个位置有上升沿和下降沿，这样，实际上在1/4T方波周期就可以有角度变化的判断，这样1/4的T周期就是Z小测量步距，通过电路对于这些上升沿与下降沿的判断，可以4倍于PPR读取角度的变化，这就是方波的四倍频。这种判断，也可以用逻辑来做，0代表低，1代表高，A/B两相在一个周期内变化是0 0，0 1，1 1，1 0 。这种判断不仅可以4倍频，还可以判断旋转方向。那么，方波信号的Z小分辨角度=360度/(4xPPR)

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编码器AB两相2500ppr怎么变成10000 ppr？希望得到计算过程万分感谢。:

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