German Eltra encoder Eltra model Eltra price

Eltra encoders are devices that encode signals (such as bitstreams) or data, converting them into signal forms suitable for communication, transmission, and storage. Encoders convert angular displacement 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; according to the 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 indicating the magnitude of displacement. In absolute encoders, each position 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. The Encoder belongs to the category of sensors (Sensor), mainly used to detect the speed, position, angle, distance, or count of mechanical motion. In addition to mechanical applications, many motor controls, such as servo motors, require encoders for commutation, speed, and position detection by the motor controller. Encoders can be classified as follows. Classification by code disk slotting method: 1) Incremental type: emits a pulse signal for every unit angle of rotation (some emit sine/cosine signals, which are then subdivided to chop out higher-frequency pulses), typically with A-phase, B-phase, or Z-phase output. The A-phase and B-phase outputs are pulses delayed by 1/4 of a cycle relative to each other; the direction of rotation can be distinguished based on this delay relationship, and 2x or 4x frequency multiplication can be achieved by using the rising and falling edges of the A-phase and B-phase signals. The Z-phase is a single-turn pulse, emitting one pulse per revolution. 2) Absolute type: for each reference angle within one revolution, a unique binary value corresponding to that angle is emitted. Multiple positions can be recorded and measured using external revolution-counting devices. Classified by signal output type: voltage output, open-collector output, push-pull complementary output, and line-driver output. Classified by mechanical installation form: 1) Shaft type: shaft types can be further divided into clamping flange, synchronous flange, and servo mount types. 2) Hollow shaft type: hollow shaft types can be further divided into semi-hollow, fully hollow, and large-bore types. Classified by working principle: photoelectric, magneto-electric, and contact brush types.

Eltra encoder advantages

Encoder advantages: small size, high precision, high inherent resolution, non-contact and wear-free; the same model can detect angular displacement and, with the help of mechanical conversion devices, linear displacement; multi-turn photoelectric absolute encoders can detect considerable ranges of linear displacement (e.g., 25-bit multi-turn). Long service life, flexible installation, rich interface options, reasonable price. Mature technology, widely applied domestically and internationally for many years. Advantages of static magnetic grid 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 at 1000 meters; rich interface options, diverse measurement methods; acceptable price.

Eltra encoder component differences

From single-turn absolute encoders to multi-turn absolute encoders. For an absolute rotary single-turn absolute encoder, the unique code is obtained by measuring the tracks on the optical code disk during rotation. When rotation exceeds 360 degrees, the code returns to the origin, which violates the principle of unique absolute encoding. Such encoding is only suitable for measurements within a rotation range of 360 degrees and is called a single-turn absolute encoder. To measure rotation beyond 360 degrees, multi-turn absolute encoders are used. Encoder manufacturing employs clock gear mechanics: when the central code disk rotates, it drives another set of code disks (or multiple sets of gears and code disks) via gear transmission, adding revolution counts to the single-turn encoding to expand the measurement range. This type of absolute encoder is called a multi-turn absolute encoder. It also determines encoding by mechanical position, with each position code being unique and non-repeating, requiring no memory. Another advantage of multi-turn encoders is that due to the large measurement range, there is often ample margin, eliminating the need to painstakingly find the zero point during installation; any intermediate position can serve as the starting point, greatly simplifying installation and commissioning.

Eltra encoder features

1) After power-up or following internal/external power faults, the encoder does not require reference driving and can obtain the current accurate position once power is normal. Under interference from various harsh environments, the raw position test data of the hollow shaft encoder remains stable and is not easily affected by interference. 2) The encoder can provide an incremental pulse code value for each axis position, especially in position control. Incremental encoders do not require counting, enabling direct high-speed internal reading and external output. Furthermore, the subsequent calculation tasks for the hollow shaft encoder in the receiving device controller can reduce the cost of other additional input components. For example, hollow shaft encoders in multi-axis parallel industrial robots can achieve high-speed multi-axis parallel synchronous operation, as well as in various control fields requiring multi-axis synchronization. 3) Fast and reliable digital data transmission is currently one of the core elements of encoders. Due to their high-resolution characteristics, hollow shaft encoders generally output digital signals directly without internal or external counting, so they are no longer affected by pulse reading and accumulation. They can respond at high speeds, and even in high-efficiency equipment, hollow shaft encoders can achieve high-resolution outputs. 4) The encoder is a very flexible device, characterized mainly by its compactness and ease of adjustment; position can usually be flexibly adjusted via spring clips. The hollow shaft encoder can determine the direction of rotation from the A-phase pulse signal and the output timing of the B-phase, thereby interpreting the pulse signal values. Currently, hollow shaft encoders are generally suitable for various application scenarios. 5) The clamping method and spring clip structure of this shaft encoder allow for easy position adjustment and absorption of load vibrations and shocks. Moreover, the hollow shaft encoder outputs based on the rotational displacement of the shaft during operation. Combined with the shaft via a coupling, it can directly detect rotational displacement. Typically, no origin reset is required at startup; under normal conditions, the rotation angle can be output in parallel as an absolute value.

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