German TER encoder TER model TER price

The TER encoder has many optical channel tracks. Each track is arranged sequentially with 2 lines, 4 lines, 8 lines, and 16 lines. In this way, 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 an n-bit absolute encoder. Such encoders use an optical code disk for memory. The absolute encoder determines the code based on mechanical position; it requires no memory, no reference point search, and no continuous counting. Whenever the position needs to be known, it can be read directly. This greatly improves the encoder's anti-interference characteristics and data reliability. From single-turn absolute encoders to multi-turn absolute encoders: in a single-turn absolute rotary encoder, the tracks of the optical code disk are measured during rotation to obtain a unique code. When the rotation exceeds 360 degrees, the code returns to the origin. This does not comply with the principle of unique absolute coding. Such coding can only be used for measurements within a rotation range of 360 degrees and is called a single-turn absolute encoder.

TER 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 components. 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 components of magnetic encoders include semiconductor magnetoresistive devices and ferromagnetic magnetoresistive devices. Thus, the detection probe of a magnetic encoder uses magnetoresistive devices 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.

TER encoder advantages and disadvantages

(1) Advantages: High precision, high resolution, and high reliability. It can directly output digital codes in a specific format, connect conveniently with microcomputers and digital systems, and is very flexible and easy to use. It is mainly used for measuring various displacement quantities. (2) Disadvantages: (1) The resolution of contact encoders is limited by brushes and cannot be very high; (2) Contact causes friction, resulting in a shorter service life; (3) Contact points do not allow high-speed operation. Therefore, this type of encoder is rarely used.

TER encoder features

1) After power-up or following internal and external power faults, the encoder does not require a reference drive and can obtain the current accurate position once power is normal. Under interference from various harsh environments, the hollow shaft encoder's original position test data 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 and can achieve direct internal high-speed reading and external output. Secondly, the hollow shaft encoder offloads calculation tasks to the receiving device controller, reducing 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 do not require internal or external counting and directly output digital signals, so they are no longer affected by pulse reading and accumulation. They can respond at high speeds. For some high-efficiency equipment, hollow shaft encoders can also achieve high-resolution outputs. 4) Furthermore, the encoder is a very flexible type, characterized mainly by its compactness and ease of adjustment. Position can usually be adjusted flexibly via spring clips. Hollow shaft encoders can determine the rotation direction by analyzing the numerical values of pulse signals through A-phase pulse signals and B-phase output timing. 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 very convenient 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. By combining 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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