German SICK STEGMANN encoder, SICK STEGMANN model, SICK STEGMANN price

SICK STEGMANN encoders are devices used to measure rotational speed and, in conjunction with PWM technology, enable rapid speed regulation. Photoelectric rotary encoders convert mechanical quantities such as angular displacement and angular velocity of the output shaft into corresponding electrical pulses via photoelectric conversion, outputting them as digital signals (REP). They are available in single-channel output and dual-channel output types. Key technical parameters include pulses per revolution (ranging from tens to thousands) and supply voltage. Single-channel output means the rotary encoder outputs one set of pulses, while dual-channel output rotary encoders output two sets of pulses with a A/B phase difference of 90 degrees. Using these two sets of pulses allows not only speed measurement but also determination of rotation direction. Classified by signal output type: voltage output, open-collector output, push-pull complementary output, and line-driver output.

SICK STEGMANN encoder device requirements

1. Requirements for CNC machine tools regarding detection elements and position detection devices (1) Requirements for CNC machine tool detection elements: Detection elements are important components of detection devices, primarily serving to detect displacement and speed and send feedback signals. The minimum displacement measurable by a displacement detection system is called resolution. Resolution depends not only on the detection element itself but also on the measurement circuit. The main requirements for CNC machine tool detection elements are: (1) long service life, high reliability, and strong anti-interference capability; (2) meeting accuracy and speed requirements; (3) ease of use and maintenance, suitable for the machine tool operating environment; (4) low cost; (5) ease of connection to computers. Different types of CNC machine tools have different requirements for the accuracy and speed of the detection system. Typically, large CNC machine tools prioritize meeting speed requirements, while medium, small, and high-precision CNC machine tools prioritize meeting accuracy requirements. When selecting the resolution and pulse equivalent of a measurement system, it is generally required to be one order of magnitude higher than the machining accuracy. (2) Requirements for CNC machine tool 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 accuracy of CNC machine tools is mainly determined by the accuracy of the detection system. Different types of CNC machine tools have different accuracy requirements for position detection elements and detection systems, as well as different maximum movement speeds for the measured components. The highest level for detection elements and systems is: when the maximum movement speed of the measured component reaches 240m/min, the displacement detection resolution (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) minimal influence from temperature and humidity, reliable operation, long-term accuracy retention, and strong anti-interference capability. (2) meeting accuracy and speed requirements within the movement range of the machine tool's executing components. (3) ease of use and maintenance, adapting 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, different detection methods can be adopted due to varying working conditions and detection requirements. (1) Incremental and absolute measurement: Incremental detection methods measure only displacement increments and represent the quantity of unit displacement (i.e., minimum setting unit) by the number of digital pulses, issuing one measurement signal for each 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, displacement is read by accumulating measurement signals; once accumulation errors occur, all subsequent measurement results will be incorrect. Additionally, in the event of a fault (such as power loss), the correct position before the fault cannot be found; after troubleshooting, the worktable must be moved to the starting point to recount and find the correct position before the fault. Pulse encoders, resolvers, induction synchronizers, gratings, magnetic scales, and laser interferometers are all incremental detection devices. Absolute measurement methods determine the absolute coordinate position value of the measured component in a specific absolute coordinate system, expressed in binary or decimal digital signals. Generally, these must 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 code disks and three-speed absolute code disks (also known as multi-turn absolute code disks). (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 CNC 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 accuracy depends on the measurement unit and is basically independent of the range; however, cumulative coding errors exist; (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 or phase. Precise analog detection over a large range imposes 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 components) to directly measure the linear or angular displacement of the end components of the executing parts are referred to as direct measurement, which can form a closed-loop feed servo system,Measurement methods include linear gratings, linear induction synchronizers, magnetic scales, and laser interferometers for measuring 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 must be as long as the travel distance, which is a significant limitation for large machine tools. Position detection devices installed on transmission elements or drive motor shafts ahead of the executing components measure their angular displacement; the linear displacement of the executing components is obtained only after conversion via the transmission ratio. This is called indirect measurement, which can form a semi-closed-loop servo feed system. For example, mounting a pulse encoder on the motor shaft. Indirect measurement is reliable and convenient to use, with no length limitations; its disadvantage is that transmission chain errors from converting linear to rotary motion are added to the detection signal, thereby affecting measurement accuracy. Generally, compensation for machine tool transmission errors is required to improve positioning accuracy. In addition to the above position detection devices, servo systems often include speed detection elements to detect and adjust engine speed. The commonly used speed detection element is the tachogenerator.

SICK STEGMANN encoder applications

The primary function refers to a program or device capable of compressing or decompressing digital video. The process of compression and potentially changing 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 transmission via video encoder signals to better provide technical implementation for live video streaming. High-definition digital video codecs are video compression standards implemented through applications.

SICK STEGMANN encoder working principle

Slots of equal angular width are cut along the edge of a code disk (divided into transparent and opaque sections), with light sources and photosensitive elements installed on both sides of the slotted code disk. As the code disk rotates with the working shaft, each passage through a slot causes a change in light intensity. After shaping and amplification, electrical pulse output signals of certain amplitude and power are obtained, where the number of pulses equals the number of slots passed. Sending this pulse signal to a counter for counting allows determining the angle rotated by the code disk from the measured digital value. To determine rotation direction, two sets of photoelectric conversion devices can be used. Their relative spatial positions are arranged to ensure that the signals they produce differ in phase by 1/4 cycle.

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