German Harrow encoder Harrow model Harrow price

Harrow encoder is a new type of angle or displacement measuring device. Its principle is to use magnetoresistive elements to measure the angle or displacement value of changing magnetic materials. Changes in the angle or displacement of the magnetic material cause changes in resistance or voltage, which are processed by a microcontroller to output pulse signals or analog signals for measurement purposes. Concentric code tracks extend from the center of the magnetic encoder code disk outward to the edge of the disk. Each layer of code track has twice as many partitions as its inner layer. The first layer has only one transparent sector and one opaque sector; the second layer at the center has two transparent sectors and two opaque sectors; and the third layer of code tracks has four transparent sectors and four opaque sectors each. The built-in sensor head is compact, suitable for small installation spaces, and features a high protection rating design, making it suitable for harsh environments. In industrial applications, it avoids the sensitivity to environmental pollution common in optical encoders, increasing long-term system stability.

Harrow Encoder Classification

According to working principles, 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. 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 by the internal memory of the counting equipment. Thus, after a power loss, the encoder must not move; otherwise, interference during pulse output upon power restoration could cause pulse loss, leading to an unknown offset in the zero point remembered by the counting equipment. This offset can only be detected when erroneous production results occur. The solution is to add a reference point. Each time the encoder passes the reference point, the reference position corrects the memory position of the counting equipment. Before reaching the reference point, position accuracy cannot be guaranteed. Therefore, 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, we hear a series of clicking sounds as they search for the reference zero point before starting work.

Harrow 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 sector-shaped zones. 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.

Harrow Encoder Wiring Method

A rotary encoder is a photoelectric rotary measuring device that directly converts measured angular displacement into digital signals (high-speed pulse signals). Encoders can be classified by signal principle into incremental encoders and absolute encoders. We typically use incremental encoders, which can input output pulse signals directly to PLC, using the high-speed counter of PLC to count the pulse signals to obtain measurement results. Different models of rotary encoders have different numbers of output pulse phases. Some rotary encoders output three-phase pulses A, B, Z; some have only two phases A, B; and the simplest has only one phase A. The encoder has 5 lead wires, of which 3 are pulse output lines, 1 is the COM terminal line, and 1 is the power line (OC open-collector output type). The encoder power can be an external power supply or directly use the DC24V power supply of PLC. The power "-" terminal must be connected to the COM terminal of the encoder, and "+" to the power terminal of the encoder. The COM terminal of the encoder is connected to the COM input terminal of PLC. The A, B, Z two-phase pulse output lines are directly connected to the input terminals of PLC. A and B are pulses with a phase difference of 90 degrees. The Z phase signal has only one pulse per revolution of the encoder and is usually used as the zero-point reference. When connecting, pay attention to the response time of the PLC input. The rotary encoder also has a shielded wire, which should be grounded during use to improve anti-interference performance. Encoder ----------- PLC.A ----------------- X0.B ----------------- X1.Z ------------------ X2. +24V ------------ +24V.COM ------------- -24V ----------- COM

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