German hengstler absolute value encoder features description

German hengstler absolute encoder features and working principle
Absolute rotary encoders have been widely used in angle, length measurement and positioning control in various industrial systems because of their absolute uniqueness, anti-interference and no need for power-down memory. There are many scribe lines on the code wheel of the absolute encoder, and each line is followed by 2 lines, 4 lines, 8 lines, and 16 lines. . . . . . Arranged, so that at each position of the encoder, by reading the pass and dark of each reticle, a set of unique binary codes from the zeroth power of 2 to the n-1 power of 2 is obtained. It is called an n-bit absolute value encoder. Such an encoder is determined by the mechanical position of the code wheel and is immune to power outages and interference. Absolute encoders are unique in each position determined by the mechanical position. They do not need to be memorized, do not need to find a reference point, and do not have to count all the time, when to know the position, and when to read its position. In this way, the anti-jamming characteristics of the encoder and the reliability of the data are greatly improved.

Data transmission method of German hengstler absolute encoder
Since absolute encoders are significantly superior to incremental encoders in positioning, they have been increasingly used in industrial positioning. Due to its high precision, the absolute encoder has a large number of output bits. If parallel output is still used, each output signal must ensure that the connection is good, and it is isolated for more complicated working conditions, and the number of connecting cable cores is large. It brings a lot of inconvenience and reduces reliability. Therefore, the absolute value encoder is usually a serial output or a bus type output in the multi-digit output type. The most commonly used serial output of the absolute encoder in Germany is synchronous serial. Output.

Rotate the single-turn absolute encoder to measure the coded lines of the code wheel in rotation to obtain the unique code. When the rotation exceeds 360 degrees, the code returns to the origin, so that it does not conform to the principle of absolute coding. The encoder can only be used for measurements within a range of 360 degrees of rotation, called a single-turn absolute encoder.
If you want to measure the range of rotation over 360 degrees, you need to use a multi-turn absolute encoder.
Another advantage of the multi-turn encoder is that due to the large measurement range, the actual use is often more affluent, so that it is not necessary to find a zero point during installation, and an intermediate position is used as a 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 positioning.
Absolute encoders are used where speed and positional accuracy are very high. The principle of a magnetic absolute encoder and an optical absolute encoder is somewhat different, but in general it is the same. The absolute encoder consists of two code discs, one of which is fixed to the center axis and the other is free to rotate. When the code wheel is rotated, the mark on a circle of code tracks can convert the current position into a special coded output (typically a binary code). For optical absolute encoders, the "mark" is the position through which the light passes. For magnetic absolute encoders, the "mark" is the position of the magnetic pole signal sensed by the sensor array.
The principle and structure of the German Hengsler Absolute Encoder allows him to provide higher quality feedback signals:
? Higher resolution
? Provides faster system startup speed because you do not need to find the origin
Multi-axis precise motion control
? Multiple communication protocols
? The system can be quickly resumed after the system is powered off.
Another feature of absolute encoders is the choice of multiple output signal types. The encoder must not only collect the feedback signal, but must also transmit it to the host system in some communication protocol. Absolute encoders are usually binary coded, but can be converted to multiple communication protocols. This also allows the absolute encoder to accommodate a wide variety of communication systems.
When do we need an absolute encoder?
Since the absolute encoder can confirm the current actual position without an external sensor, it is widely used in many fields.
? Multi-axis CNC system used in part machining
? Cranes that require precise position detection, cranes
? Automatic door without limit switch
? Continuously moving robots can operate normally without power return after power failure
German Hengsler hengstler absolute encoder mechanical installation
The mechanical installation of the absolute rotary encoder has various forms such as high-speed end mounting, low-speed end mounting, and auxiliary mechanical installation.
High-speed end installation: installed on the shaft end of the power motor (or gear connection). The advantage of this method is high resolution. Since the multi-turn encoder has 4096 turns, the number of motor revolutions is within this range, which can be fully increased by the full range. The disadvantage of resolution is that after the moving object passes through the reduction gear, there is gear gap error in the round trip, which is generally used for one-way high-precision control positioning, such as roll gap control of rolling steel. In addition, the encoder is directly mounted on the high-speed end, and the motor jitter must be small, otherwise the encoder may be damaged.
Low speed end installation: After installing on the reduction gear, such as the shaft end of the hoisting wire rope reel or the last section of the reduction gear shaft end, this method has no gear back and forth clearance, the measurement is relatively straightforward and the precision is high. Distance positioning, such as various lifting equipment, feeding cart positioning, etc.
Auxiliary mechanical installation: Commonly used are rack and pinion, chain belt, friction wheel, rope collecting machine, etc.