German Thalheim encoders, Thalheim models, Thalheim prices

Thalheim encoder is a new type of angle or displacement measurement device. Its principle is to use magnetoresistive elements to measure the angle or displacement value of changing magnetic materials. Changes in the angle or displacement of the magnetic material cause changes in resistance or voltage. After processing by a microcontroller, pulse signals or analog signals are output to achieve measurement. Concentric code tracks start from the center of the magnetic encoder code disk and expand outward to the outside of the disk. Each layer of code track has twice as many partitions as its inner layer. The first layer has only one transparent sector and one opaque sector; the second layer located at the center has two transparent sectors and two opaque sectors; and the third layer of code track has four transparent sectors and four opaque sectors. The built-in sensor head is small in size, suitable for small installation spaces, and adopts a high protection level design, making it usable in harsh environments. In industrial applications, it avoids the sensitivity to environmental pollution common in optical types, increasing long-term system stability.

Thalheim encoder device requirements

1. Requirements for CNC machine tools regarding detection elements and position detection devices (1) Requirements of CNC machine tools for detection elements: Detection elements are important components of detection devices. Their main function is to detect displacement and speed and send feedback signals. The minimum displacement that a displacement detection system can measure is called resolution. Resolution depends not only on the detection element itself but also on the measurement circuit. The main requirements of CNC machine tools for detection elements are: (1) Long service life, high reliability, and strong anti-interference capability; (2) Meet precision and speed requirements; (3) Easy to use and maintain, suitable for the machine tool operating environment; (4) Low cost; (5) Easy to connect with computers. Different types of CNC machine tools have different requirements for the precision and speed of the detection system. Usually, large CNC machine tools prioritize meeting speed requirements, while medium, small, and high-precision CNC machine tools prioritize meeting precision requirements. When selecting the resolution and pulse equivalent of the measurement system, it is generally required to be one order of magnitude higher than the machining precision. (2) Requirements of CNC machine tools for position detection devices: Position detection devices are an important part of the servo system of CNC machine tools. Their function is to detect displacement and speed, send feedback signals, and form closed-loop or semi-closed-loop control. The machining precision of CNC machine tools is mainly determined by the precision of the detection system. Different types of CNC machine tools have different requirements for the precision of position detection elements and detection systems, as well as the maximum moving speed of the measured components. The highest level of detection elements and systems is: when the maximum moving speed of the measured component is as high as 240m/min, the resolution of displacement detection (the minimum detectable displacement) can reach 1μm; for example, at 24m/min, it can reach 0.1μm. The highest resolution can reach 0.01μm. CNC machine tools have the following requirements for position detection devices: (1) Less affected by temperature and humidity, reliable operation, capable of maintaining precision for a long time, and strong anti-interference capability. (2) Can meet precision and speed requirements within the moving range of the machine tool's executing components. (3) Easy to use and maintain, adaptable to the machine tool working environment. (4) Low cost. Introduction to spindle encoders 2. Classification of position detection devices: For different types of CNC machine tools, due to different working conditions and detection requirements, the following different detection methods can be adopted. (1) Incremental and absolute measurement: The incremental detection method only measures displacement increments and uses the number of digital pulses to represent the quantity of unit displacement (i.e., the minimum setting unit). A measurement signal is issued for every movement of one measurement unit. Its advantage is that the detection device is relatively simple, and any midpoint can serve as the measurement starting point. However, in this system, the displacement is read out after accumulating measurement signals. Once the accumulation is incorrect, all subsequent measurement results will be wrong. Additionally, in the event of a fault (such as power outage), the correct position before the accident cannot be found. After the accident is resolved, the worktable must be moved to the starting point to recount in order to find the correct position before the accident. Pulse encoders, resolvers, induction synchronizers, gratings, magnetic scales, laser interferometers, etc., are all incremental detection devices. Absolute measurement method measures the absolute coordinate position value of the measured component in a certain absolute coordinate system, and represents it in binary or decimal digital signals. Generally, it needs to be converted into pulse digital signals before being sent for comparison and display. With this method, the higher the resolution requirement, the more complex the structure. Such measurement devices include absolute pulse encoding disks, three-speed absolute encoding disks (also known as multi-turn absolute encoding disks), etc. (2) Digital and analog measurement: Digital detection quantifies the measured unit and represents it in digital form. The measurement signal is generally an electrical pulse, which can be directly sent to the numerical control system for comparison and processing. Such detection devices include pulse encoders and gratings. Digital detection has the following 3 characteristics. (1) The measured quantity is converted into the number of pulses, facilitating display and processing; (2) Measurement precision depends on the measurement unit and is basically unrelated to the range; however, there is cumulative code error; (3) The detection device is relatively simple, and pulse signals have strong anti-interference capability. Analog detection represents the measured quantity using continuous variables, such as changes in voltage amplitude, phase changes, etc. Precise analog detection over a large range has high technical requirements. In CNC machine tools, analog detection is mainly used for small-range measurements. Analog detection devices include tachogenerators, resolvers, induction synchronizers, and magnetic scales. The main characteristics of analog detection are as follows. (1) Direct detection of the measured quantity without quantization. (2) High-precision measurement can be achieved within a small range. (3) Capable of direct and indirect detection. Position detection devices installed on executing components (i.e., end pieces) to directly measure the linear displacement or angular displacement of the end pieces of executing components are called direct measurement, which can form a closed-loop feed servo system,Measurement methods include linear gratings, linear induction synchronizers, magnetic scales, laser interferometers, etc., to measure the linear displacement of executing components; since this detection method uses linear detection devices to measure the linear displacement of machine tools. Its advantage is that it directly reflects the linear displacement of the worktable. The disadvantage is that the detection device is required to be as long as the travel, which is a significant limitation for large machine tools. Position detection devices are installed on the transmission elements in front of the executing components or on the drive motor shaft to measure their angular displacement. The linear displacement of the executing components is obtained after transformation through the transmission ratio. This is called indirect measurement, which can form a semi-closed-loop servo feed system. For example, installing a pulse encoder on the motor shaft. Indirect measurement is reliable and convenient to use, with no length limitations; its disadvantage is that the transmission chain error from linear to rotary motion is added to the detection signal, thereby affecting measurement precision. Generally, compensation for the transmission error of the machine tool is required to improve positioning precision. In addition to the above position detection devices, servo systems often include speed detection elements to detect and adjust the engine speed. The commonly used speed detection element is the tachogenerator.

Main functions of Thalheim encoders

It is a rotary sensor that converts rotary displacement into a string of digital pulse signals. These pulses can be used to control angular displacement. If the encoder is combined with a rack and pinion or a lead screw, it can also be used to measure linear displacement. After the encoder generates electrical signals, they are processed by numerical control devices CNC, programmable logic controllers PLC, control systems, etc. These sensors are mainly applied in the following areas: machine tools, material processing, motor feedback systems, and measurement and control equipment. In ELTRA encoders, the conversion of angular displacement adopts the principle of photoelectric scanning. The reading system is based on the rotation of a radial graduated disk, which consists of alternating transparent and opaque windows. The entire system is illuminated vertically by an infrared light source, so that the light projects the image on the disk onto the surface of the receiver. The receiver is covered with a grating, called a collimator, which has the same windows as the optical disk. The receiver's job is to sense the light changes produced by the rotation of the optical disk and then convert the light changes into corresponding electrical changes. Generally, a rotary encoder can also obtain a speed signal, which is fed back to the frequency converter to adjust the output data of the frequency converter. Fault phenomenon: 1. When the rotary encoder is faulty (no output), the frequency converter cannot work normally, the running speed becomes very slow, and the frequency converter protects after a while, displaying "PG disconnected"... Joint action is required to take effect. To raise the electrical signal to a higher level and generate square wave pulses without any interference, electronic circuits must be used for processing. The pg wiring of the encoder and the connection method between the vector frequency converter and the encoder pg must correspond to the model of the encoder pg. Generally, encoder pg models are divided into three types: differential output, open collector output, and push-pull output. The signal transmission method must consider the interface of the frequency converter pg card, so choosing the appropriate pg card model or setting it reasonably is necessary. Encoders are generally divided into incremental and absolute types, with the biggest difference between them: in the case of incremental encoders, the position is determined by the number of pulses calculated from the zero mark, while the position of absolute encoders is determined by the reading of the output code. Within one revolution, the reading of the output code at each position is unique; therefore, when the power is disconnected, the absolute encoder does not lose track of the actual position. If the power is connected again, the position reading remains current and valid; unlike incremental encoders, there is no need to search for the zero mark. The series produced by encoder manufacturers are very complete and generally specialized, such as elevator-specific encoders, machine tool-specific encoders, servo motor-specific encoders, etc. Furthermore, encoders are intelligent and have various parallel interfaces to communicate with other devices. An encoder is a device that converts angular displacement or linear displacement into electrical signals. The former is called a code disk, and the latter is called a code scale. According to the reading method, encoders can be divided into contact and non-contact types. Contact type uses brush output, where a brush contacts the conductive area or insulating area to indicate whether the code status is "1" or "0"; the receiving sensitive elements of the non-contact type are photosensitive elements or magnetosensitive elements. When using photosensitive elements, the transparent and opaque areas indicate whether the code status is "1" or "0". According to the working principle, encoders can be divided into incremental and absolute types. Incremental encoders convert displacement into periodic electrical signals, and then convert these electrical signals into counting pulses, using the number of pulses to represent the magnitude of displacement. Each position of an absolute encoder corresponds to a definite digital code, so its indication value is only related to the starting and ending positions of the measurement, and not to the intermediate process of the measurement. Rotary incremental encoders output pulses during rotation, and their position is known through counting equipment. When the encoder is stationary or powered off, it relies on the internal memory of the counting equipment to remember the position. In this way, after a power outage, the encoder must not move at all. During the pulse output process when power is restored, there must be no interference that causes pulse loss; otherwise, the zero point remembered by the counting equipment will shift, and the amount of this shift is unknown until erroneous production results appear. The solution is to add a reference point. Every time the encoder passes the reference point, the reference position is corrected into the memory position of the counting equipment. Before the reference point, the accuracy of the position cannot be guaranteed. Therefore, in industrial control, there are methods such as finding the reference point before each operation and finding zero at startup. Such encoders are determined by the mechanical position of the code disk and are not affected by power outages or interference. Absolute encoders determine the uniqueness of each position by mechanical position. They do not require memory, do not need to find a reference point, and do not need to count continuously. Whenever the position needs to be known, its position is read. In this way,the anti-interference characteristics of the encoder and the reliability of the data are greatly improved. Since absolute encoders are significantly superior to incremental encoders in positioning, they are increasingly applied in industrial control positioning. Due to the high precision of absolute encoders and the large number of output bits, if parallel output is still used, the connection of each bit of output signal must be ensured to be very good. For more complex working conditions, isolation is also required, resulting in many cable cores, which brings much inconvenience and reduces reliability. Therefore, for multi-bit output types, absolute encoders generally select serial output or bus-type output. The most common serial output for absolute encoders produced in Germany is SSI (Synchronous Serial Interface). Multi-turn absolute encoders. Encoder manufacturers use the principle of clock gear mechanics. When the central code disk rotates, another group of code disks (or multiple groups of gears and code disks) is driven through gear transmission. On the basis of single-turn encoding, the encoding of the number of turns is added to expand the measurement range of the encoder. Such absolute encoders are called multi-turn absolute encoders. They are also determined by mechanical position for encoding, with each position code being unique and non-repeating, without the need for memory. Another advantage of multi-turn encoders is that due to the large measurement range, there is often considerable margin in actual use. Thus, during installation, it is not necessary to struggle to find the zero point; a certain intermediate position can be used as the starting point, greatly simplifying the difficulty of installation and debugging. Multi-turn absolute encoders have obvious advantages in length positioning and are increasingly applied in industrial control positioning.

Thalheim encoder hybrid type

Hybrid absolute value encoder, which outputs two sets of information: one set of information is used to detect the magnetic pole position, with absolute information function; the other set is completely the same as the output information of an incremental encoder. Photoelectric encoder is an angle (angular velocity) detection device. It converts the angle input to the shaft into corresponding electrical pulses or digital quantities using the principle of photoelectric conversion. It has the advantages of small size, high precision, reliable operation, and digital interface. It is widely used in devices and equipment that require angle detection, such as CNC machine tools, rotary tables, servo drives, robots, radar, and military target determination.

Weidou Intelligent Technology professionally sells German Thalheim rotary encoders, Thalheim incremental encoders, Thalheim absolute encoders, Thalheim photoelectric encoders, Thalheim magneto-electric encoders, Thalheim shafted encoders, Thalheim hollow shaft encoders, Thalheim contact brush encoders, Thalheim angle encoders, Thalheim linear encoders, Thalheim digital encoders, Thalheim draw-wire encoders, Thalheim position encoders, Thalheim hollow encoders, Thalheim spindle encoders, Thalheim original German imports. Welcome customers to inquire and order.