Brief introduction of Eltra absolute encoder

eltra rotary single-turn absolute encoder measures each engraved line of the optical code disc during rotation to obtain a unique code. When the rotation exceeds 360 degrees, the code returns to the original point, which does not meet the absolute code uniqueness. In principle, such an encoder can only be used for measurement within a rotation range of 360 degrees, and is called a single-turn absolute encoder. If you want to measure rotation beyond 360 degrees, you must use a multi-turn absolute encoder.

The encoder manufacturer uses the principle of clock gear mechanism. When the center code wheel rotates, another set of code discs (or multiple sets of gears, multiple sets of code discs) are driven by gears, and the number of turns is added to the single-turn encoding. Encoding, in order to expand the measuring range of the encoder, such an absolute encoder is called a multi-turn absolute encoder, it is also determined by the mechanical position code, each position code is unique and does not repeat, without the need to remember. Another advantage of the multi-turn encoder is that due to the large measurement range, the actual use is often richer, so it is not necessary to find a change point during installation, and a certain intermediate position can be used as the starting point, which greatly simplifies the difficulty of installation and debugging. Multi-turn absolute encoders have obvious advantages in length positioning and have been increasingly used in industrial control positioning.

　　The mechanical installation and use of absolute rotary encoder: The mechanical installation of absolute rotary encoder has various forms such as high-speed end installation, low-speed end installation, and auxiliary mechanical device installation.

High-speed end installation: Installed on the shaft end of the power motor (or gear connection). This method has the advantage of high resolution. Since the multi-turn encoder has 4096 moving turns within this range, the full range can be used to increase the resolution. The disadvantage is that after the moving object passes through the reduction gear, there is a gear gap error in the back and forth stroke, which is generally used for one-way high-precision control and positioning, such as roll gap control for steel rolling. In addition, the encoder is directly installed on the high-speed end, and the motor jitter must be small, otherwise the encoder is easily damaged.

Encoder low-speed end installation: installed after the reduction gear, such as the shaft end of the winding wire rope drum or the shaft end of the last reduction gear, this method has no gear back and forth clearance, the measurement is more direct, and the accuracy is higher. This method is general Measure long-distance positioning, such as various lifting equipment, positioning of feeding carts, etc.

　　 Auxiliary machinery installation: commonly used gears and racks, chain belts, friction wheels, rope winding machinery, etc.

　　Optical encoder features:

　　 1. Adopting reflective induction technology

　　2. Surface mount leadless package

　　3. Provide two-channel analog signal output

　　 4. Counting frequency: 20KHz

　　 5. Operate with a single 5.0V power supply

　　 6. Working temperature: -10 to 70oC

　　7. Coding resolution: 180LPI

　　 8. Meet the requirements of RoHS environmental protection standards

　　 Since absolute encoders are significantly better than incremental encoders in positioning, they have been increasingly used in industrial control positioning. Absolute encoders have a large number of output digits due to their high precision. If parallel output is still used, each output signal must be well connected. For more complex working conditions, it must be isolated and the number of connecting cables is large. Bringing a lot of inconvenience and reducing reliability. Therefore, the absolute encoder in the multi-digit output type generally uses serial output or bus type output. The most commonly used serial output of the absolute encoder produced in Germany is SSI (synchronous serial Line output).

Iltra's eltra rotary single-turn absolute encoder measures each engraved line of the optical code disc during rotation to obtain a unique code. When the rotation exceeds 360 degrees, the code returns to the original point, which does not meet the absolute code uniqueness. In principle, such an encoder can only be used for measurement within a rotation range of 360 degrees, and is called a single-turn absolute encoder.