German Bosch Rexroth encoders, Bosch Rexroth models, Bosch Rexroth prices

Bosch Rexroth 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 working 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 contacts a conductive or insulating area to indicate 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".

Bosch Rexroth encoder installation and usage

Mechanical installation of absolute rotary encoders includes high-speed end installation, low-speed end installation, and auxiliary mechanical device installation. High-speed end installation: Installed at the drive motor shaft end (or via gear connection). The advantage of this method is high resolution. Since multi-turn encoders have 4096 turns, and the motor rotation falls within this range, the full range can be utilized to improve resolution. The disadvantage is gear backlash error during forward and reverse motion through reduction gears, so it is generally used for unidirectional high-precision positioning control, such as roll gap control in steel rolling. Additionally, when the encoder is directly installed on the high-speed end, motor vibration must be minimal to avoid damaging the encoder. Low-speed end installation: Installed after the reduction gear, such as at the shaft end of a hoist wire rope drum or the last stage of the reduction gear shaft. This method eliminates gear backlash, provides more direct measurement and higher accuracy, and is generally used for long-distance positioning, such as in various lifting equipment and feed cart positioning. Auxiliary mechanical installation: Common methods include rack and pinion, chain and belt, friction wheels, and cable reels.

Bosch Rexroth 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 N 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.

Bosch Rexroth encoder signal output

Signal outputs include sine wave (current or voltage), square wave (TTL, HTL), open collector (PNP, NPN), and push-pull types. Among these, TTL is long-line differential drive (symmetrical A, A-; B, B-; Z, Z-). HTL is also known as push-pull output. The interface of the encoder's signal receiving equipment should match the encoder. Signal connection—The encoder's pulse signal is generally connected to counters, PLC, and computers. Modules connecting PLC and computers are divided into low-speed and high-speed modules, with varying switching frequencies. Single-phase connection is used for unidirectional counting and speed measurement. A.B Two-phase connection is used for bidirectional counting, direction determination, and speed measurement. A, B, Z Three-phase connection is used for position measurement with reference mark correction. Connection of A, A-, B, B-, Z, Z- uses symmetrical negative signals. The electromagnetic field contribution of the current to the cable is 0, resulting in minimum attenuation and optimal interference resistance, allowing for longer transmission distances. For TTL encoders with symmetrical negative signal output, the signal transmission distance can reach 150 meters. For HTL encoders with symmetrical negative signal output, the signal transmission distance can reach 300 meters.

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