German SICOD encoder SICOD model SICOD price

SICOD encoders convert displacement into periodic electrical signals, which are then converted into counting pulses, with the number of pulses representing the magnitude of displacement. According to their operating principle, encoders can be divided into incremental and absolute types. Incremental encoders convert displacement into periodic electrical signals, which are then converted into counting pulses, with the number of pulses representing the magnitude of displacement. An encoder is a device that converts angular or linear displacement into electrical signals. The former is called a code disk, and the latter a code scale. According to the readout method, encoders can be divided into contact and non-contact types. Contact types use brush outputs, where a brush contacting a conductive or insulating area indicates whether the code state is "1" or "0"; non-contact types use photosensitive or magnetosensitive elements as receiving sensors. When using photosensitive elements, transparent and opaque areas indicate whether the code state is "1" or "0".

SICOD encoder accuracy

(1) uses a code disk with 8421 coding. Although relatively simple, it has strict requirements for code disk manufacturing and installation; otherwise, erroneous codes may occur. When the brush transitions from binary code 0111 to 1000, the value should change from 7 to 8. However, if the brushes do not enter the conductive areas simultaneously, any decimal number between 8 and 15 may appear, resulting in the aforementioned non-single-value error. One solution is to use a Gray code disk. Due to the characteristics of Gray code, even if manufacturing and installation are inaccurate, the maximum error is only one bit in the least significant position. Therefore, Gray code disks offer higher accuracy than 8421 code disks. (2) Scanning method. There are three scanning methods: V scanning, U scanning, and M scanning. A single brush is installed on the least significant bit track, while two brushes are installed on other bit tracks: one ahead of the measured position (leading brush) and one behind (lagging brush). If the incremental width of the effective bit on the least significant track is z, the corresponding distances for the brushes are 1x, 2x, 4x, 8x, etc. 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 brush distribution and encoding change rules, to read the level value corresponding to the high-order binary code at that position: when the lower-order track brush truly outputs "1", the true output on the higher-order track must be read from the lagging brush; if the lower-order track brush truly outputs "0", the true output on the higher-order track must be read from the leading brush. Since there is only one brush on the least significant track, its output represents the true position. This method is the V scanning method.

SICOD encoder component differences

From single-turn absolute encoders to multi-turn absolute encoders. An absolute rotary single-turn absolute encoder measures the engraved lines on each track of the optical code disk during rotation to obtain a unique code. When the rotation exceeds 360 degrees, the code returns to the origin, which violates the principle of uniqueness for absolute encoding. Such encoding can only be used for measurements within a rotation range of 360 degrees and is called a single-turn absolute encoder. For measuring rotations exceeding a range of 360 degrees, a multi-turn absolute encoder is used. Encoder manufacturing employs the mechanical principles of clockwork gears. As the central code disk rotates, another set of code disks (or multiple sets of gears and code disks) is driven via gear transmission. This adds turn-count encoding to the single-turn encoding, thereby expanding the measurement range of the encoder. Such an absolute encoder is called a multi-turn absolute encoder. It also determines the code by mechanical position, ensuring that each position code is unique and non-repeating without the need for memory. Another advantage of multi-turn encoders is that, due to the large measurement range, there is often considerable spare capacity. Thus, it is not necessary to struggle to find the zero point during installation; a certain intermediate position can be used as the starting point, greatly simplifying the difficulty of installation and commissioning.

SICOD encoder component differences

From single-turn absolute encoders to multi-turn absolute encoders. An absolute rotary single-turn absolute encoder measures the engraved lines on each track of the optical code disk during rotation to obtain a unique code. When the rotation exceeds 360 degrees, the code returns to the origin, which violates the principle of uniqueness for absolute encoding. Such encoding can only be used for measurements within a rotation range of 360 degrees and is called a single-turn absolute encoder. For measuring rotations exceeding a range of 360 degrees, a multi-turn absolute encoder is used. Encoder manufacturing employs the mechanical principles of clockwork gears. As the central code disk rotates, another set of code disks (or multiple sets of gears and code disks) is driven via gear transmission. This adds turn-count encoding to the single-turn encoding, thereby expanding the measurement range of the encoder. Such an absolute encoder is called a multi-turn absolute encoder. It also determines the code by mechanical position, ensuring that each position code is unique and non-repeating without the need for memory. Another advantage of multi-turn encoders is that, due to the large measurement range, there is often considerable spare capacity. Thus, it is not necessary to struggle to find the zero point during installation; a certain intermediate position can be used as the starting point, greatly simplifying the difficulty of installation and commissioning.

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