German AVTRON encoder AVTRON model AVTRON price

AVTRON encoders provide an absolutely unique position for each point, are interference-resistant, and do not require power-loss memory. They are increasingly widely used in angle and length measurement and positioning control in various industrial systems. Absolute rotary optical encoders, due to their absolutely unique position for each point, interference resistance, and lack of need for power-loss memory, are increasingly widely used in angle and length measurement and positioning control in various industrial systems. The optical code disk of an absolute encoder has many tracks of lines, with each track arranged sequentially as 2 line, 4 line, 8 line, 16 line, and so on. Thus, at each position of the encoder, by reading the light and dark states of each track, a unique 2-base code (Gray code) is obtained, ranging from the zeroth power of 2 to the n-1th power of 2. This is called an n-bit absolute encoder. Such encoders are determined by the mechanical position of the code disk and are unaffected by power outages or interference. The uniqueness of each position in an absolute encoder is determined by its mechanical position; it requires no memory, no reference point search, and no continuous counting. The position is read only when needed. This significantly improves the encoder's interference resistance and data reliability. Since absolute encoders are clearly superior to incremental encoders in positioning, they are increasingly used in industrial control positioning. Due to their high precision and large number of output bits, if parallel output were still used for absolute encoders, each bit's output signal would need to ensure excellent connection, and isolation would be required for complex operating conditions. The large number of cable cores would cause considerable inconvenience and reduce reliability. Therefore, for multi-bit output types, absolute encoders generally use serial or bus-type output. The most common serial output for German-made absolute encoders is SSI (Synchronous Serial Interface). A single-turn absolute rotary encoder measures the tracks on the optical code disk during rotation to obtain a unique code. When rotation exceeds 360 degrees, the code returns to the origin, which violates the principle of absolute encoding uniqueness. Such encoders can only be used for measurements within a rotation range of 360 degrees and are called single-turn absolute encoders. To measure rotation beyond a 360-degree range, a multi-turn absolute encoder is required. Manufacturers of absolute encoders use the mechanical principle of clock gears. When the central code disk rotates, another set of code disks (or multiple sets of gears and code disks) is driven via gear transmission. Count encoding is added to the single-turn encoding to expand the encoder's measurement range. Such absolute encoders are called multi-turn absolute encoders. They also determine encoding by mechanical position, ensuring each position code is unique and non-repeating without requiring memory. Another advantage of multi-turn encoders is that the large measurement range often provides considerable margin in actual use. This eliminates the need for tedious zero-point finding during installation; a middle position can serve as the starting point, greatly simplifying installation and commissioning. Multi-turn absolute encoders have significant advantages in length positioning and are increasingly used in industrial control positioning.

AVTRON encoder installation and use

Mechanical installation of absolute rotary encoders includes high-speed end installation, low-speed end installation, and auxiliary mechanical device installation. High-speed end installation: Installed at the drive motor shaft end (or via gear coupling). The advantage of this method is high resolution. Since multi-turn encoders have 4096 turns, and the motor's number of rotations falls within this range, the full range can be utilized to improve resolution. The disadvantage is gear backlash error during forward and reverse motion after passing through reduction gears. It is generally used for unidirectional high-precision control positioning, such as roll gap control in steel rolling. Additionally, if the encoder is directly installed on the high-speed end, motor vibration must be minimal; otherwise, the encoder may be easily damaged. Low-speed end installation: Installed after the reduction gear, such as at the shaft end of a hoist wire rope drum or the last stage of the reduction gear shaft. This method eliminates gear backlash error, provides more direct measurement, and offers higher accuracy. It is generally used for long-distance positioning measurements, such as in various lifting equipment and feed cart positioning. Auxiliary mechanical installation: Common methods include rack and pinion, chain and belt, friction wheels, and rope winding mechanisms.

AVTRON encoder working principle

The optical code disk of the series absolute encoder has many optical channel tracks. Each track is arranged sequentially as 2 line, 4 line, 8 line, and 16 line. At each position of the encoder, by reading the light and dark states of each track, a unique 2-base code (Gray code) is obtained, ranging from the zeroth power of 2 to the n-1th power of 2. This is called an n-bit absolute encoder. Such encoders are determined by the mechanical position of the optical code disk and are unaffected by power outages or interference. Absolute encoders determine encoding by mechanical position; they require no memory, no reference point search, and no continuous counting. The position is read only when needed. This significantly improves the encoder's interference resistance and data reliability.

AVTRON encoder component differences

From single-turn absolute value encoders to multi-turn absolute value encoders. A single-turn absolute rotary encoder measures the tracks on the optical code disk during rotation to obtain a unique code. When rotation exceeds 360 degrees, the code returns to the origin, which violates the principle of absolute encoding uniqueness. Such encoding can only be used for measurements within a rotation range of 360 degrees and is called a single-turn absolute value encoder. To measure rotation beyond a 360-degree range, a multi-turn absolute value encoder is used. Encoder manufacturers employ the mechanical principle of clock gears. When the central code disk rotates, another set of code disks (or multiple sets of gears and code disks) is driven via gear transmission. Count encoding is added to the single-turn encoding to expand the encoder's measurement range. Such absolute encoders are called multi-turn absolute encoders. They also determine encoding by mechanical position, ensuring each position code is unique and non-repeating without requiring memory. Another advantage of multi-turn encoders is that the large measurement range often provides considerable margin in actual use. This eliminates the need for tedious zero-point finding during installation; a middle position can serve as the starting point, greatly simplifying installation and commissioning difficulty.

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