Incremental photoelectric encoder in milling machine is mainly composed of light source, code plate, light rail, photosensitive components and conversion circuits and other components, as shown.
The incremental photoelectric encoder is engraved with radially light-colored stripes with equal pitch, and the adjacent two stripe represent a resolution angle α. There is a fixed encoder in the encoder, light rail engraved with A, B two groups of light transmission stripes. When the disc is rotated with the rotating shaft, the light is transmitted to the photosensitive element through the light transmission strip on the disc and the light rail, and the photosensitive element outputs the electrical signals of A and B and the phase difference 90°electrical angle, as shown. A, B two signals used to determine the direction of rotation, if A ahead B 90°, then the encoder forward. If B is advanced by A 90°, then the encoder is reversed.
There is also a light transmission stripes on the inside of the code wheel. When the code wheel turns a turn, the corresponding photosensitive element of the stripe produces an electrical signal Z, called a zero mark pulse (also called a turn pulse).
Milling machine Incremental photoelectric encoder is characterized by the generation of a pulse signal corresponding to an angular displacement increment, the increment is the resolution angle. Counting the pulse is the accumulation of diagonal displacement increments, the cumulative result is the measured angular displacement. In addition, since the count pulse frequency is proportional to the encoder speed, the speed of the milling machine encoder can be obtained by measuring the counting pulse frequency.
When the incremental encoder is de-energized, the current position information is lost. Therefore, the CNC milling machine with the incremental encoder is operated back to the reference point after power-on. The reference point is determined by finding the zero sign signal to establish the measurement reference.
The above is a brief introduction to the CNC milling machine incremental encoder, and welcome to continue your attention.