German TAMPOPRINT encoder TAMPOPRINT model TAMPOPRINT price

TAMPOPRINT encoders are a type of digital sensor, belonging to the category of code disk encoders. Code disk encoders are also known as absolute encoders; they convert angles into digital codes and can be easily connected to digital systems (such as microcomputers). Contact encoders consist of a code disk and brushes. The code disk is a disc-shaped printed circuit board with a specific code pattern, manufactured on copper-clad laminates using printed circuit board fabrication processes. A brush is a movable contact structure; under external force, when the code disk rotates, the contact between the brush and the code disk generates a digital code output in a specific coding format.

TAMPOPRINT Encoder Classification

Based on working principles, encoders can be divided into two types: incremental and absolute. Incremental encoders convert displacement into periodic electrical signals, which are then converted into counting pulses; the number of pulses represents the magnitude of displacement. Each position of an absolute encoder corresponds to a specific digital code, so its reading depends only on the start and end positions of the measurement, not on the intermediate process. Rotary incremental encoders output pulses during rotation, and their position is determined by counting equipment. When the encoder is stationary or power is lost, the position is retained in the internal memory of the counting device. Therefore, after a power loss, the encoder must not move; otherwise, interference causing pulse loss during operation after power restoration will shift the zero point remembered by the counting device. This shift amount is unknown until erroneous production results occur. The solution is to add a reference point; each time the encoder passes the reference point, the counted position is corrected to the reference position in the memory. Position accuracy cannot be guaranteed before reaching the reference point. Hence, in industrial control, methods such as finding the reference point before each operation or homing at startup are used. For example, the positioning of printers and scanners uses the principle of incremental encoders; each time they are powered on, a rattling sound is heard as they search for the reference zero point before starting work.

TAMPOPRINT Encoder Categories

Absolute encoders are sensors that directly output digital quantities. Their circular code disks have several concentric code tracks along the radial direction. Each track consists of alternating transparent and opaque sectors. The number of sectors in adjacent tracks has a double relationship. The number of code tracks on the disk equals the number of bits in its binary code. On one side of the code disk is a light source, and on the other side, there is a photosensitive element corresponding to each code track. When the code disk is in different positions, each photosensitive element converts the presence or absence of light into corresponding level signals, forming a binary number. A feature of this encoder is that no counter is required; a fixed digital code corresponding to the position can be read at any position of the shaft. Obviously, the more code tracks, the higher the resolution. For an encoder with N-bit binary resolution, its code disk must have N code tracks. Absolute encoders use natural binary or cyclic binary (Gray code) methods for photoelectric conversion. The difference between absolute encoders and incremental encoders lies in the transparent and opaque line patterns on the disk. Absolute encoders can have several codes; the absolute position is detected by reading the codes on the disk. Code designs can use binary code, cyclic code, binary complement, etc. Its features are: 1.2.1 the absolute value of the angle coordinate can be read directly; 1.2.2 there is no cumulative error; 1.2.3 position information is not lost after power cutoff. However, resolution is determined by the number of binary bits, meaning accuracy depends on the number of bits. Currently, there are 10-bit, 14-bit, and other variants.

TAMPOPRINT Encoder Selection Considerations

1) Mechanical installation dimensions: including locating spigot, shaft diameter, mounting hole positions; cable exit method; installation space volume; whether the environmental protection rating meets requirements. 2) Resolution: i.e., the number of pulses output per revolution by the encoder during operation, and whether it meets the design accuracy requirements. 3) Electrical interface: Common encoder output methods include push-pull output (F type HTL format), voltage output (E), open collector (C, common C is NPN transistor output, C2 is PNP transistor output), and long-line driver output. The output method should match the interface circuit of its control system.

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