The principle of pulse encoder

When circular grating with working axis rotation, the light through the two part of grating lines, form the light and dark stripes. The light signal from the photoelectric element and accept the light and shade, and converted into alternating electric signals. The electrical signal for the two groups of similar to sine wave current signal of A and B, as shown in figure 2. A and B signal phase difference of 90 °, amplifying and shaping into A square wave. Through two grating signal, as well as a "pulse", called Z pulse, the pulse is also through the process. Z pulse is used to generate the benchmark for the machine tool. Subsequent pulses are sent to counter, according to the number and frequency of the pulse can be measured Angle and speed of work. The resolution depends on the number of turns round grating and measuring line segment ratio.