The application of optical encoders！

The accuracy of the encoder depends on the minimum angle it can distinguish, which depends on the number of fringes on the circumference of the encoder, ie, the resolving angle α = 360 ° / slit number. If the number of fringes is 1024, the resolution angle α = 360 ° / 1024 = 0.352 °. The output signals A and B of the photoelectric encoder are differential signals. The differential signal greatly improves the anti-interference ability of the transmission. In the numerical control system, often the signal frequency processing, in order to further improve the resolution. For example, the configuration of the 2000 pulse / r photoelectric encoder servo motor encoder directly drive 8mm pitch ball screw, the CNC system 4 times the frequency processing, the equivalent of 8000 pulse / r angular resolution, the corresponding table linear resolution from 0.004mm before frequency doubling to 0.001mrn. The advantage of the photoelectric encoder is no contact wear, long code disk life, allowing high speed, and the width of the outer ring can be done per piece is small, and thus high accuracy. Drawback is the complexity of the structure, the price is relatively high, light source life is short.
Application of Optical Encoder
Incremental photoelectric encoder according to the number of pulses per revolution to a number of points to a variety of models, such as the most commonly used CNC machine tools are listed in the table below, according to the NC machine tool screw pitch to use.
Pulse encoders
Pulse movement per revolution (mm)
2000 pulses / r 2,3,4,6,8
2500 pulses / r 5,10
3000 pulses / r 3,6,12
In order to adapt to high-speed, high-precision digital servo system needs, has developed a high-resolution optical pulse encoder. There are now used to send 100,000 per revolution or millions of pulses of the encoder, the type of optical pulse encoder device within the application of the microprocessor.
Optical encoders are designed to achieve very high accuracy with a single-turn resolution of more than 4 million pulses. These advantages make the optical encoder in a lot of demanding resolution of a place, such as: a computer mouse, copier or medical machinery. Optical phase array technology through the application of optical encoders can also be used in more harsh environments, such as tower base.
Although magnetic encoders may be considered in some extreme environments, it is important to consider whether the accuracy and resolution of the optoelectronic encoder are more important for our system or the reliability of the magnetic encoders

Previous：CNC machine optical rotary encoders 1024 ppr Dc5V spindle encoder
Next：Roundss non-contact Hollow Shaft Rotary Magnetic Ring Encoder For CNC machine