增量式编码器是直接利用光电转换原理输出三组方波脉冲A、B和Z相；A、B两组脉冲相位差90°，从而可方便地判断出旋转方向，而Z相为每转一个脉冲，用于基准点。它的优点是原理构造简单，机械平均寿命可在几万小时以上，抗干扰能力强，可靠性高，适合于长距离传输。其缺点是无法输出轴转动的位置信息。
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