German ReSatron encoder ReSatron model ReSatron price

ReSatron 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; each track is arranged sequentially with 2 line, 4 lines, 8 lines, 16 lines..., so that, at each position of the encoder, by reading the light/dark state 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 a n-bit absolute encoder. Such an encoder is determined by the mechanical position of the code disk and is unaffected by power outages or interference. The uniqueness of each position in an absolute encoder, determined by mechanical position, means it requires no memory, no reference point search, and no continuous counting; the position is read whenever 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 conditions. The large number of cable cores brings much inconvenience and reduces 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. Counting of turns is added to the single-turn code to expand the encoder's measurement range. Such absolute encoders are called multi-turn absolute encoders. They also determine the code 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. Thus, there is no need to struggle to find the zero point during installation; an intermediate position can be used as the starting point, greatly simplifying installation and commissioning. Multi-turn absolute encoders have clear advantages in length positioning and are increasingly used in industrial control positioning.

ReSatron encoder precision

(1) Uses a code disk with 8421 coding. Although relatively simple, strict requirements are placed on the manufacturing and installation of the code disk; otherwise, erroneous codes may occur. When the brush transitions from binary code 0111 to 1000, 7 should change to 8. However, if the brushes enter the conductive area at inconsistent times, any decimal number between 8 and 15 may appear. This results in the aforementioned non-single-value error. One method to solve this problem is to use a cyclic code disk. Due to the characteristics of cyclic code, even if manufacturing and installation are inaccurate, the maximum error is only one bit in the least significant position. Therefore, using a cyclic code disk offers higher precision than using an 8421 code disk. (2) Scanning method. There are three types of scanning: V scanning, U scanning, and M scanning. A brush is installed on the least significant bit track, while two brushes are installed on all other bit tracks: one brush is located before the measured position, called the leading brush; the other is placed after the measured position, called the lagging brush. If the incremental width of the effective bit on the least significant bit track is z, then the distances corresponding to the brushes for each bit are 1x, 2x, 4x, 8x, etc. Thus, at each definite position, the output level of the least significant bit brush reflects its true value. Since there are two brushes for higher bits, two levels are output. Based on the brush distribution and coding change rules, to read the level value corresponding to the high-order binary code reflecting that position: when the brush on the lower-level track truly outputs "1", the true output on the higher-level track must be read from the lagging brush; if the brush on the lower-level track truly outputs "0", the true output on the higher-level track must be read from the leading brush. Since there is only one brush on the least significant bit track, its output represents the true position. This method is the V scanning method.

ReSatron encoder applications

The main function refers to a program or device capable of compressing or decompressing digital video. It is the process of compression and potentially changing the video content format, converting an analog source to a digital source. Both audio and video require customizable compression methods. In terms of compression, the goal is to reduce occupied space. Any digital video requires transmission via a video encoder signal to better provide technical implementation for live video streaming. High-definition digital video codecs are video compression standards implemented through applications.

ReSatron encoder hybrid type

Hybrid absolute encoders output two sets of information: one set detects magnetic pole position and provides absolute information functionality; the other set is completely identical to the output information of an incremental encoder. An optical encoder is an angle (angular velocity) detection device. It converts the angular quantity input to the shaft into corresponding electrical pulses or digital quantities using the principle of photoelectric conversion. It offers advantages such as small size, high precision, reliable operation, and digital interfaces. It is widely used in devices and equipment requiring angle detection, such as CNC machine tools, rotary tables, servo drives, robots, radar, and military target determination.

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