Absolute servo motor encoder！

The incremental encoder outputs pulses as it rotates and knows its position by the counting device. When the encoder is stationary or in the event of a power failure, it relies on the internal memory of the counting device to remember the position. In this way, when the power failure, the encoder can not have any movement, when the caller work, the encoder output pulse process, there can be no interference and loss of pulse, otherwise, the zero point will be offset device memory, and this bias The amount of shift is no way to know, only the wrong results of the production to know. The solution is to increase the reference point, the encoder after each reference point, the reference position will be corrected into the memory location of the counting device. Prior to the reference point, the accuracy of the position can not be guaranteed. To this end, there is every time in the industrial control to find the first reference point, boot to change and other methods. For example, the positioning of the printer scanner is the incremental encoder principle, each boot, we can hear the crackle of a ring, it is looking for reference zero, and then work. This method is more cumbersome for some industrial projects, and even does not allow boot to change (after boot to know the exact location), so there will be the emergence of absolute encoders. Absolute rotating optical encoder, because of its absolute location of each unique, anti-jamming, no power-down memory, has become increasingly widely used in various industrial systems in the angle, length measurement and positioning control. Absolute Encoder The optical encoder disc has a number of tracks, each of which is followed by two lines, four lines, eight lines, and sixteen lines. . . . . . So that at each position of the encoder, by reading the pass and dark of each track, a set of binary zeros from 2 to 2 n-1 th power binary code (Gray ), This is called the n-bit absolute encoder. Such an encoder is determined by the mechanical position of the encoder disk, and is not affected by power failure or interference. Absolute Encoder The uniqueness of each position determined by the mechanical position. It does not need to memorize. It does not need to find a reference point. It does not always count, when it needs to know the position and when to read its position. In this way, the anti-jamming characteristics of the encoder, the reliability of the data is greatly enhanced. Since absolute encoders are significantly superior to incremental encoders in terms of positioning, they have been increasingly used in servo motors. Absolute encoder because of its high precision, the output bit more, such as still with parallel output, each of its output signal must ensure a good connection for the more complex conditions but also isolated, connecting cable core number, which Resulting in a lot of inconvenience and reduce the reliability of the absolute encoder in the multi-digit output type, are generally selected serial output or bus-type output, the absolute production of the German encoder serial output is the most commonly used SSI (synchronous string Line output). From single-turn absolute encoders to multi-turn absolute encoders Rotate single-turn absolute encoders to rotate each measuring track in the optical encoder to obtain a unique code. When rotated more than 360 degrees, the code returns To the origin, so that does not meet the absolute principle of absolute coding, such an encoder can only be used within the rotation range of 360 degrees of measurement, known as the single lap absolute encoder. If you want to measure more than 360-degree range of rotation, it is necessary to use multi-turn absolute encoder. Encoder manufacturers use the principle of the clock gear machine, when the center code wheel rotation, through the gear drive another set of code (or multiple sets of gears, multi-group code disc), in the single-loop coding based on additional laps Encoding, to expand the encoder measuring range, so that the absolute encoder is called multi-turn absolute encoder, it is also determined by the mechanical position coding, the only encoding of each position does not repeat without memory. Multi-turn encoder Another advantage is due to a large measurement range, the actual use is often more affluent, so that when the installation is not necessary to hard to find a zero, the middle position as a starting point can be a
And greatly simplifies the installation and debugging difficulty. Multi-turn absolute encoder position in the length of the obvious advantages, the new European out of the servo motor is basically a multi-cycle
Absolute type encoders

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