Eltra absolute value encoder

The eltra absolute encoder determines the code by the mechanical position, it does not need to remember, do not need to find the reference point, and does not need to keep counting, when you need to know the position, when to read its position. In this way, the anti-interference characteristics of the encoder and the reliability of the data are greatly improved. There are many optical channel engraved lines on the optical code disc of absolute encoder, and each engraved line is in order of 2, 4, 8 and 16 lines. . . . . . Arrangement, in this way, at each position of the encoder, by reading the open and dark of each engraved line, a set of unique binary codes from the zero power of 2 to the n-1 power of 2 (Gray Code), which is called an n-bit absolute encoder.

Absolute encoder: special product pull-wire and magnetic encoder, absolute bus system, metric measuring wheel, electronic handwheel, intrinsically safe explosion-proof encoder; also includes photoelectric and inductive proximity switches. The absolute encoder is a rotating disc with several transparent and opaque windows. The light receiver is used to collect intermittent light beams. After the light pulses are converted into electric pulses, they are processed by the electronic output circuit and sent out.

Classification of absolute encoders:

　　 Single-turn absolute encoder:

　　Single-turn absolute encoder even in the case of power failure, as long as the encoder shaft rotates one angle, an accurate displacement value can be obtained, and each displacement value can be accurately converted into Gray code or binary code. The maximum resolution of Eltra single-turn encoders can reach 8192 positions/revolution (13 bits).

　　Multi-turn absolute encoder:

　　Multi-turn absolute encoder is identified by EAM start character. It is an extension of the application range of single-turn encoders. The single-turn resolution of this type of encoder can reach 8192 positions/revolution. At the same time, its multi-turn count can reach 4096 revolutions. We can make a flexible extension measuring linear motion accessory according to customer requirements. The attachment on the main shaft allows the encoder to be ‘stacked’ to install one or more reducers, so that even when the encoder is powered down, accurate readings can be ensured. Eltra's encoder resolution is currently up to 25 bits, which is equivalent to 33,553,432 positions. The performance of the encoder is good and safe. Eltra's multi-turn encoders have a variety of optional electrical output methods and mechanical characteristics.

　　 Precautions for absolute encoder:

　　 1. The absolute value encoder is a precision instrument, do not knock or impact, handle it gently, and use it carefully.

　　2. Ensure that the power supply of the absolute value encoder is within the rated range, and is well isolated to prevent the large-scale starting electrical in the power grid from impacting the absolute value encoder.

　　 3. In the environment of strong electromagnetic interference, it is best to use dedicated wires for signal lines, such as twisted pair shielded cables.

The signal wire of the absolute encoder should be well grounded: within 2 meters, both ends of the shielding net in the cable should be grounded. For a longer distance, the metal shell of the absolute encoder should be grounded, and the shielding net of the built-in cable should be suspended. The signal extension cable shielding net is grounded at the signal receiving end at a single end; if the signal cable is long or used outdoors, the signal cable should be covered with a metal sleeve, and both ends of the metal pipe should be grounded.

　　 Principle of absolute encoder:

There are many optical channel engraved lines on the optical code disc of absolute encoder, and each engraved line is arranged in 2 lines, 4 lines, 8 lines, 16 lines..., so that at each position of the encoder, by reading each track The opening and darkening of the engraved lines obtain a set of unique binary codes (Gray codes) from the zero power of 2 to the n-1 power of 2, which is called an n-bit absolute encoder. Such an encoder is determined by the mechanical position of the photoelectric code disc, and it is not affected by power failure or interference.

　　 Each position determined by the mechanical position of the absolute encoder is unique. It does not need to be memorized, no need to find a reference point, and it does not need to be counted all the time. When it needs to know the position, when to read its position. In this way, the anti-interference characteristics of the encoder and the reliability of the data are greatly improved.

From single-turn absolute value encoder to multi-turn absolute value encoder, rotating single-turn absolute value encoder measures each engraved line of the photoelectric code disc during rotation to obtain a unique code. When the rotation exceeds 360 degrees, the code is again Back to the origin, this does not comply with the principle of the only absolute code, such a code can only be used for measurement within the rotation range of 360 degrees, called a single-turn absolute encoder.

If you want to measure rotation beyond 360 degrees, you need to use a multi-turn absolute encoder. The encoder manufacturer uses the principle of clock gear machinery. When the center code disk rotates, another set of code disks (or multiple sets of Gears, multiple sets of code discs), add the number of turns encoding to the single-turn encoding to expand the measuring range of the encoder. Such an absolute encoder is called a multi-turn absolute encoder, which is also mechanical Position determination 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 there is no need to laboriously find the change point during installation. It is enough to use a certain intermediate position as the starting point, which greatly simplifies the difficulty of installation and debugging.