German SCANCON encoders, SCANCON models, SCANCON prices

SCANCON 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.

SCANCON encoder operating principle

A magnetic encoder consists of an optical code disk with a central shaft, featuring concentric transparent and opaque lines. Photodiode emitters and receivers read these lines to obtain four sets of sinusoidal signals, combined into A, B, C, and D. Each sine wave has a phase difference of 90 degrees. Inverting the C and D signals and superimposing them onto the A and B phases enhances signal stability. Additionally, one Z phase pulse is output per revolution to represent the zero reference position. Since the A and B phases differ by 90 degrees, the direction of rotation (forward or reverse) of the magnetic encoder can be determined by comparing which phase leads. The zero reference position is obtained via the zero pulse. Code disk materials for magnetic encoders include glass, metal, and plastic. Glass code disks have very thin lines deposited on glass, offering good thermal stability and high precision. Metal code disks use direct transparent and opaque lines, but due to the thickness of the metal, precision is limited, and thermal stability is an order of magnitude worse than that of glass. Plastic code disks are an economical option. The principle of magneto-electric encoders is similar to that of optical encoders, but they use magnetic field signals. Inside a magnetic encoder, a magnetic rotor and magnetoresistive sensors are used. The rotation of the magnetic rotor causes changes in the internal magnetic field strength. The magnetoresistive sensors detect these changes, and after signal processing by the circuitry, output signals are generated. The number of magnetic poles on the magnetic rotor, the number of magnetoresistive sensors, and the signal processing method determine the resolution of the magnetic encoder. The advantage of generating signals using magnetic field principles is that magnetic signals are not affected by dust, moisture, high temperatures, or vibration.

SCANCON encoder categories

An absolute encoder is a sensor that directly outputs digital signals. Its circular code disk features several concentric code tracks arranged radially. Each track consists of alternating transparent and opaque sectors. The number of sectors in adjacent tracks follows a double relationship. The number of code tracks on the disk corresponds to the number of bits in its binary code. A light source is located on one side of the disk, and a photosensitive element corresponding to each code track is located on the other side. When the code disk is at different positions, each photosensitive element converts the presence or absence of light into corresponding level signals, forming a binary number. This type of encoder does not require a counter; a fixed digital code corresponding to the position can be read at any position of the rotating shaft. Obviously, the more code tracks there are, 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 various coding schemes, and the absolute position is detected by reading the code on the disk. Coding designs can adopt binary code, cyclic code, two's complement binary code, etc. Its characteristics are: 1.2.1 the absolute value of the angular 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, the resolution is determined by the number of binary bits, meaning accuracy depends on the number of bits. Currently, there are various options such as 10-bit and 14-bit.

SCANCON 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, commonly C uses NPN transistor output, C2 uses PNP transistor output), and line driver output. The output method should match the interface circuit of its control system.

Weidou Intelligent Technology specializes in selling German SCANCON rotary encoders, SCANCON incremental encoders, SCANCON absolute encoders, SCANCON optical encoders, SCANCON magneto-electric encoders, SCANCON shafted encoders, SCANCON hollow shaft encoders, SCANCON contact brush encoders, SCANCON angle encoders, SCANCON linear encoders, SCANCON digital encoders, SCANCON draw-wire encoders, SCANCON position encoders, SCANCON hollow bore encoders, SCANCON spindle encoders, SCANCON original German imports. Welcome customers to inquire and order.