German Fraba encoder Fraba model Fraba price

Fraba encoders provide an absolutely unique position for each point, are interference-resistant, and do not require power-loss memory. They are increasingly widely used in angle and length measurement and positioning control in various industrial systems. Absolute rotary optical encoders, due to their absolutely unique position for each point, interference resistance, and lack of need for power-loss memory, are increasingly widely used in angle and length measurement and positioning control in various industrial systems. The optical code disk of an absolute encoder has many tracks of lines, with each track arranged sequentially as 2 line, 4 line, 8 line, 16 line, and so on. Thus, at each position of the encoder, by reading the light and dark states of each track, a unique 2-ary code (Gray code) is obtained, ranging from the zeroth power of 2 to the n-1th power of 2. This is called a n-bit absolute encoder. Such encoders are determined by the mechanical position of the code disk and are unaffected by power outages or interference. The uniqueness of each position in an absolute encoder, determined by mechanical position, means it requires no memory, no reference point search, and no continuous counting; the position is read only when needed. This significantly improves the encoder's interference resistance and data reliability. Since absolute encoders are clearly superior to incremental encoders in positioning, they are increasingly used in industrial control positioning. Due to their high precision and large number of output bits, if parallel output were still used for absolute encoders, every bit output signal would need to ensure excellent connection, and isolation would be required for more complex conditions. The large number of cable cores brings much inconvenience and reduces reliability. Therefore, for multi-bit output types, absolute encoders generally use serial or bus-type output. For German-made absolute encoders, the most common serial output is SSI (Synchronous Serial Interface). A single-turn absolute rotary encoder measures the tracks on the optical code disk during rotation to obtain a unique code. When rotation exceeds 360 degrees, the code returns to the origin, which contradicts the principle of absolute encoding uniqueness. Such encoders can only be used for measurements within a rotation range of 360 degrees and are called single-turn absolute encoders. To measure rotation beyond a 360-degree range, a multi-turn absolute encoder is required. Manufacturers of absolute encoders use the principle of clock gear mechanics. When the central code disk rotates, another set of code disks (or multiple sets of gears and code disks) is driven via gear transmission. Count encoding is added to the single-turn encoding to expand the measurement range of the encoder. Such absolute encoders are called multi-turn absolute encoders. They also determine encoding by mechanical position, ensuring each position code is unique and non-repeating without the need for memory. Another advantage of multi-turn encoders is that the large measurement range often provides considerable margin in actual use. Thus, during installation, there is no need to struggle to find the zero point; a certain intermediate position can be used as the starting point, greatly simplifying installation and commissioning. Multi-turn absolute encoders have clear advantages in length positioning and are increasingly used in industrial control positioning.

Fraba encoder principle

Magnetic encoders adopt a magneto-electric design, generating or providing the position and speed of the actuator (servo motor) through changes in the magnetic field of magnetic sensing devices. The physical working principle of magnetic encoders is the magnetoresistive effect. The magnetoresistive effect arises from charge carriers inside a current-carrying conductor or semiconductor. Under the influence of the external Lorentz force, the trajectory of internal charge carriers deflects or undergoes spiral motion, causing a change in the potential difference inside the conductor or semiconductor. This process is a microscopic manifestation; macroscopically, as long as the external magnetic field changes, the magnetoresistance value changes accordingly. This is the magnetoresistive effect of magnetic encoders. The magnetoresistive devices in magnetic encoders include semiconductor magnetoresistive devices and ferromagnetic magnetoresistive devices. Therefore, the detection probe of a magnetic encoder uses a magnetoresistive device as the magnetic head. Currently, common magnetoresistive heads for magnetic encoder probes include Giant Magnetoresistance (GMR) heads (GMR) and Anisotropic Magnetoresistance (AMR) heads (AMR). However, due to advantages such as better frequency characteristics and higher sensitivity compared to GNR heads, AMR heads are gradually becoming the mainstream application for magnetic encoders.

Fraba encoder advantages

Small size, high bai precidusion, high inherent resolution, non-contact and wear-free; the same zhi type can detect angular displacement and, with the help of dao mechanical conversion devices, linear displacement; multi-turn optical absolute encoders can detect considerable lengths of linear displacement (e.g., 25-bit multi-turn). Long service life, flexible installation, rich interface options, and reasonable price. Mature technology, widely used domestically and internationally for many years. Disadvantages: High precision but requires higher protection for outdoor and harsh environment use; measuring linear displacement relies on mechanical device conversion, requiring elimination of errors caused by mechanical backlash; difficult to overcome slip when detecting objects moving on tracks. Advantages of static magnetic grating absolute encoders: Moderate size, direct measurement of linear displacement, absolute digital encoding, theoretically unlimited range; non-contact and wear-free, resistant to harsh environments, usable underwater up to 1000 meters; rich interface options and diverse measurement methods.

Fraba encoder wiring method

A rotary encoder is a photoelectric rotary measuring device that directly converts the measured angular displacement into digital signals (high-speed pulse signals). Encoders are classified by signal principle into incremental encoders and absolute encoders. We typically use incremental encoders, which can input the output pulse signals of the rotary encoder directly into a PLC, using the PLC's high-speed counter to count the pulse signals to obtain measurement results. Different models of rotary encoders have different output pulse phases; some rotary encoders output three-phase pulses A, B, and Z, some have only two phases A and 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 the PLC. The power '-' terminal must be connected to the encoder's COM terminal, and '+' to the encoder's power terminal. The encoder's COM terminal is connected to the PLC input COM terminal. The A and B two-phase pulse output lines are directly connected to the PLC input terminals. A and B are pulses with a 90-degree phase difference. The Z phase signal has only one pulse per encoder revolution and is typically used as the zero-point reference. When connecting, pay attention to the PLC input response time. The rotary encoder also has a shielded wire, which must be grounded during use to improve interference resistance. Encoder ----------- PLC.A ----------------- X0.B ----------------- X1.Z ------------------ X2. +24V ------------ +24V.COM ------------- -24V ----------- COM

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