German Woelke encoder Woelke model Woelke price

The Woelke 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, its position is read directly. This greatly improves the encoder's anti-interference characteristics and data reliability. From single-turn absolute encoders to multi-turn absolute encoders: An absolute rotary single-turn absolute encoder measures the tracks of the optical code disk during rotation to obtain a unique code. When rotation exceeds 360 degrees, the code returns to the origin, which 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.

Woelke encoder principle

Magnetic encoders adopt a magnetoelectric 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 changes in the potential difference within 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.

Woelke encoder applications

The main function refers to a program or device capable of compressing or decompressing digital video. The process of compression and potentially changing the video content format converts an analog source to a digital source. Both audio and video require customizable compression methods. In terms of compression, the goal is to reduce occupied space. Any digital video requires signal transmission via a video encoder to better provide technical implementation for live video streaming. High-definition digital video codecs are video compression standards implemented through applications.

Woelke encoder component differences

From single-turn absolute encoders to multi-turn absolute encoders. An absolute rotary single-turn absolute encoder measures the tracks of the optical code disk during rotation to obtain a unique code. When rotation exceeds 360 degrees, the code returns to the origin, which 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. For measuring rotation beyond the 360 degree range, multi-turn absolute encoders are used. Encoder production employs clock gear mechanical principles. When the central code disk rotates, another set of code disks (or multiple sets of gears and code disks) is driven via gear transmission. Based on single-turn coding, turn-count coding is added to expand the measurement range of the encoder. Such absolute encoders are called multi-turn absolute encoders. They also determine the code based on mechanical position, ensuring each position code is unique and non-repetitive without requiring memory. Another advantage of multi-turn encoders is that due to the large measurement range, there is often considerable margin. Therefore, during installation, it is not necessary to struggle to find the zero point; simply setting an intermediate position as the starting point suffices, greatly simplifying installation and commissioning difficulties.

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