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2021 / 01 / 11
In the information technology era, security products have attracted more and more attention. In network monitoring systems, encoders are the bridge between monitoring storage and transmission. Rotary encoder is a common encoder, commonly used in monitoring video transmission equipment, speed measuring generators and other security products, used to measure the speed and with the PWM technology can achieve fast speed device, photoelectric rotary encoder through photoelectric conversion The output shaft angular displacement, angular velocity and other mechanical quantities can be converted into corresponding electrical pulses for digital output (REP). Rotary encoders are divided into single output and dual output. The technical parameters mainly include the number of pulses per revolution (tens to several thousand), and the supply voltage. Single output means that the output of the rotary encoder is a set of pulses, while the dual-output rotary encoder outputs two sets of pulses with 90-degree phase difference between A and B. Through these two sets of pulses, not only the rotation speed but also the rotation can be determined. The direction. Rotary encoder installation techniques are also very particular about, such as improper operation is likely to lay hidden security risks, the following we understand the installation of rotary encoder related issues. Do not apply direct impact to the shaft during installation
Application of Encoder in Synchronizing Deviation Control in Crane Industry
2021 / 01 / 09
Based on Canopen field bus, the application cases of synchronous correction and control of large-span portal crane lifting equipment. one. Door machine lifting equipment's particularity: The safety requirements for door crane lifting equipment are becoming more and more prominent. The concept of safety first is more and more important in the control. According to regulations, the double-track synchronous correction control must be added to the large-span door machine over 40 meters to prevent left and right double tracks. The wheels of the door machine are overrunning and the track is even derailed. Due to safety requirements, the left and right double track wheels of the door machine need more synchronous control. The reliable feedback of speed, location and other information directly relates to the safe and reliable control, and the door The environmental special features of the crane lifting equipment also determine the particularity of the selection of these signal sensors and transmissions: 1. In the complex work environment on site, inverters, large motors, and high- and low-voltage power systems often have their signal cables routed together with power lines. The electrical interference at the site is severe. 2. Equipment mobility, long moving distance, difficult grounding. 3. The distance required for signal transmission is far, and the safety and reliability of signal data are demanding. 4. Synchronous con
Is there a stepper motor encoder? Stepper motor how to add encoder
2021 / 01 / 08
Stepping motor working principle When a current flows through the stator windings, the stator winding generates a vector magnetic field. The magnetic field will drive the rotor to rotate an angle so that the direction of a pair of magnetic fields of the rotor coincides with the direction of the magnetic field of the stator. When the stator's vector magnetic field rotates an angle. The rotor also turns an angle with the magnetic field. Each time an electric pulse is input, the motor rotates an angle forward. The angular displacement it outputs is proportional to the number of input pulses and the speed is proportional to the pulse frequency. By changing the order in which the windings are energized, the motor will reverse. Therefore, the number of control pulses, the frequency, and the sequence of energization of the motor phases can be used to control the rotation of the stepper motor. Commonly seen types of motors have iron cores and winding coils inside. Windings have resistance, and power will produce losses. The loss is proportional to the square of the resistance and current. This is the copper loss we often say. If the current is not a standard DC or sine wave, it will also produce harmonic losses; the core has hysteresis. The eddy current effect also produces losses in an alternating magnetic field. Its magnitude is related to material, current, frequency, and voltage. This is called iron loss. Both copper loss and iron loss are manifested as
Optical encoder classification and selection
2021 / 01 / 08
The encoder Encoder is a kind of sensor, which is mainly used to detect the speed, position, angle, distance or count of mechanical motion. Except for industrial machinery, many motor controls such as servo motor and BLDC servo motor The use of an encoder for the motor controller as a commutation, speed and position detection makes it a very versatile application. According to the detection principle, encoders can be classified into optical, magnetic, inductive and capacitive. According to its calibration method and signal output form, it is divided into incremental encoder and absolute encoder. Photoelectric encoders use the principle of grating diffraction to realize displacement-to-digital conversion. Since the 1950s, they have been used in machine tools and computing equipment. Because of their simple structure, high measurement accuracy, and long life, they are valued and promoted at home and abroad. Positioning, speed, length, acceleration, vibration, etc. are widely used. a. Incremental encoder features: When the incremental encoder shaft rotates, there is a corresponding pulse output, and the count starting point is arbitrarily set, which can realize infinite multi-turn accumulation and measurement. Rotation of the encoder shaft will output a fixed pulse
CAN bus interface of absolute photoelectric shaft encoder
2021 / 01 / 07
1 Introduction The absolute photoelectric shaft angle encoder is a digital angle measuring device that measures the angular position and angular velocity of the rotating shaft in real time. It converts the shaft angle information into digital codes in the form of degrees, minutes and seconds, and the Bus connection can realize real-time measurement. It has the advantages of high working reliability, strong anti-interference ability, high precision, power-off memory and so on. It is widely used in digital measurement tracking and positioning systems such as shooting range equipment, digital theodolite, radar and some large military equipment. In these practical application control systems, due to the different data structures of the sensors and detectors of each subsystem, the absolute photoelectric shaft encoder will use different internal data communication methods, mainly including RS232, RS485 / 488 serial ports, parallel ports, etc. . However, in specific engineering applications, the above communication methods are often limited by transmission distance and communication rate. In recent years, serial communication has developed rapidly, and a variety of control system field bus forms have emerged. The CAN bus is one of the most widely used. It is the abbreviation of controller local area network bus and is an effective support for distributed control and real-time control. Serial communication network. Due to the high performance, high reliability and unique design of CAN bus, it has become the most popular and real-time field bus at home and abroad. The development and changes of internal communication methods in the
Talking about the principle of encoder correctly understanding the encoder
2021 / 01 / 07
Encoder does not seem to bring obvious advantages in the analog monitoring system, but in the network monitoring system, the encoder has set up a bridge between monitoring storage and transmission. In the face of different monitoring architectures, the encoder did not exert its original strength. So now let's talk about the principle of the encoder. The IP-based video surveillance system has many advantages, in which the image quality is improved by at least 30% over the analog system. Network scalability and operating costs are lower, and more convenient is that users can control the management through the computer. Obviously, these are not available in analog CCTV surveillance systems. IP video improves picture quality, improves management, and reduces system operating costs. In addition, it also provides a future-oriented platform, and good network technology is always ready for the megapixel and HD era. The video encoder converts the signal input from the analog camera into a digital video stream. Common compression standards such as M-JPEG, MPEG-4 or H.264 output video formats will be the same and can be fully integrated into network cameras and networks. Video system. Codec also built-in features include video motion detection, tamper alarms, and video analysis.
BQH24 Mine Intrinsically Safe Encoder / Mine Encode
2021 / 01 / 07
1. Use and scope of use In the mine automation system can not be separated from the speed closed-loop control. Especially in mine hoists and dual-use belt conveyors that require high speed feedback, speed closed-loop control is used to enhance system operation reliability. For this reason, BQH24 mining intrinsically safe encoders are indispensable in closed-loop control or speed protection devices. The mine shaft encoder can be used together with the mine winch, belt conveyor electrical control device, and can also be used alone as a winch and belt conveyor speed measuring device and protection device. 2. Use environmental conditions Environmental requirements a) Ambient temperature: -5°C to 40°C; b) average relative humi
High-speed servo unit based on CPLD and absolute encoder
2021 / 01 / 06
At present, the servo motors in domestic CNC machine tools are generally equipped with incremental encoders, while the accuracy of incremental encoders is not too high and the output is parallel signals. To improve its accuracy, it is necessary to increase the design of the encoder. Difficulty and increase the output of parallel signals, which is not conducive to the long-distance communication between the servo unit and the encoder. The absolute encoder is used, except that its accuracy is several times higher than that of the incremental encoder. High-speed serial communication saves communication lines for long-distance communication. At the other end of the encoder, CPLD and absolute encoder are used for high-speed serial communication. The CPLD then converts the received encoder information into parallel data transmission. The DSP in the servo unit performs arithmetic control. This paper will give the software and hardware design of high-speed serial communication between CPLD and absolute encoder . hardware design The hardware is mainly composed of three modules: power supply, CPLD and its peripheral circuits and absolute encoder interface circuit. Power module
Lathe Z-axis absolute encoder back to reference point - Database & Sql Blog Articles
2021 / 01 / 06
Factory direct 0805 red light quality absolutely guaranteed price absolute advantage AD brand ADUM1402ARWZ special treatment original imported absolutely original Programmable Package SG-8018CA(SG7050C) 0.67M~170M
Application of Absolute Encoder in Robot Arm
2021 / 01 / 05
In general, the feedback of the position information of each robot arm requires an absolute encoder to provide feedback. In the application of high-precision robotic arm, such as the robotic arm of semiconductor automation, it is also considered to work with ASAS-7000 and can provide up to 30 multi-rotational position information, providing necessary feedback information for the precise control of the robotic arm. For the AEAT-84AD, motion information of 12,000 revolutions per minute can be detected, and the response is very sensitive; by reading the position information, parameters such as the movement speed of the robot arm can be calculated. For the multi-dimensional robot arm movement position, the absolute encoder can be read by the main controller when it is powered on. This has great advantages for the incremental encoder. For the design of the mechanical arm, the AEAT-84AD has the advantages of high precision, high sensitivity, small size, and modular design, and the absolute encoder can be better applied to it. In multi-turn optoelectronic absolute encoder applications, because the location information does not require battery power or other storage, it can be easily read after the system is powered on. These advantages are unmatched by incremental encoders. Absolute encoders have the advantages of high accuracy, high sensitivity, fast response, small size, modular design, etc. They can be well applied in gate opening
2021 / 01 / 05
The rotary incremental encoder outputs a pulse when it is rotated, and its position is known by the counting device. When the encoder is not moving or power is off, the internal memory of the counting device is used to remember the position. In this way, when the power is off, the encoder can't have any movement. When the caller works, the encoder can not interrupt and lose the pulse during the output pulse. Otherwise, the zero point of the counting device will shift, and this bias The amount of shift is unknown, and only the wrong production result can be known. The solution is to increase the reference point, and the encoder corrects the reference position into the memory position of the counting device every time the encoder passes the reference point. Before the reference point, the accuracy of the position cannot be guaranteed. For this reason, in the industrial control, there are methods such as finding a reference point for each operation, and starting to change the zero. For example, the positioning of the printer scanner is the incremental encoder principle. Every time we turn it on, we can hear a bang, it is looking for the reference zero, and then it works. This method is more troublesome for some industrial control projects, and even does not allow booting to change to zero (you must know the exact position after booting), so there is an absolute encoder. Absolute rotary photoelectric encoders have been widely used in angle, length measurement and positioning control in various industrial systems because of their absolute uniqueness, anti-interference and no need for power-down memory. There are many scribe lines on the absolute encoder optical disc. Each line is followed by 2 lines, 4 lines, 8 lines and 16 lines. Orchestration, so that at each position of the encoder, by reading the pass and dark of each reticle, a set of unique binary codes from the zeroth power of 2 to the n-1
Servo motor encoder absolute and incremental difference
2021 / 01 / 04
An encoder is a device that compiles and converts a signal (such as a bit stream) or data into a form that can be used for communication, transmission, and storage. The encoder converts an angular displacement or a linear displacement into an electrical signal, the former being called a code wheel and the latter being called a code ruler. According to the readout mode, the encoder can be divided into contact type and non-contact type; according to the working principle, the encoder can be divided into two types: incremental type and absolute type. The incremental encoder converts the displacement into a periodic electrical signal, which is then converted into a counting pulse, and the number of pulses is used to represent the magnitude of the displacement. Each position of the absolute encoder corresponds to a certain digital code, so its indication is only related to the start and end positions of the measurement, regardless of the intermediate process of the measurement. Incremental servo motor encoder introduction Incremental coding In addition to the ABZ signal of the ordinary encoder, the incremental servo encoder also has a UVW signal. Most of the domestic and early imported servos use this form, and the lines are more. The incremental encoder outputs a pulse when it is rotated, and its position is known by the counting device. When the encoder is not moving or power is off, the internal memory of the coun
Servo motor encoder absolute and incremental difference
2021 / 01 / 04
An encoder is a device that compiles and converts a signal (such as a bit stream) or data into a form that can be used for communication, transmission, and storage. The encoder converts an angular displacement or a linear displacement into an electrical signal, the former being called a code wheel and the latter being called a code ruler. According to the readout mode, the encoder can be divided into contact type and non-contact type; according to the working principle, the encoder can be divided into two types: incremental type and absolute type. The incremental encoder converts the displacement into a periodic electrical signal, which is then converted into a counting pulse, and the number of pulses is used to represent the magnitude of the displacement. Each position of the absolute encoder corresponds to a certain digital code, so its indication is only related to the start and end positions of the measurement, regardless of the intermediate process of the measurement. Incremental servo motor encoder introduction Incremental coding In addition to the ABZ signal of the ordinary encoder, the incremental servo encoder also has a UVW signal. Most of the domestic and early imported servos use this form, and the lines are more. The incremental encoder outputs a pulse when it is rotated, and its position is known by the counting device. When the encoder is not moving or power is off, the internal memory of the counting device is used to remember the position. In this way, when the power is off, the encoder can't have any movement. When the caller works, the encoder can not interrupt
Application of 6-channel incremental encoder in intelligent textile machine
2021 / 01 / 03
The balance of the textile mechanism of the intelligent textile machine is of great significance for improving the reliability of the work of the components and reducing the vibration, especially the noise in the textile production. In addition to the application of parts used in general machinery manufacturing, textile machines are also widely used in a series of special parts and mechanisms with unbalanced quality. In most cases, the parts with unbalanced quality are in the textile machine. The main body, and only intrinsic on the textile machine. The motor is an intrinsic component of a smart-controlled textile machine. The monitoring of the motor shaft is an important technology. The Rep-Avago's 48mm 6-channel incremental encoder from Shenzhen Shiqiang can meet the application of the textile industry. The 6-channel incremental encoder is a high-precision metering grating as a detecting component, and converts the input angular position information into a corresponding pulse or digital code detecting device by photoelectric conversion technology. Incremental encoders consist of LED light sources, grating pairs, optoelectronic receivers, spindles, electronic processing circuits and more. The grating pair is composed of a main grating code disc and an indicating grating as a main detecting unit of the photoelectric encoder; the code disc is fixed on the main shaft, and the oth
Introduction to the selection and use of incremental rotary encoder
2021 / 01 / 03
First, what are the precautions for incremental rotary encoder selection? Should pay attention to the three parameters: 1. Mechanical installation dimensions, including positioning stop, shaft diameter, mounting hole position; cable outlet mode; installation space volume; working environment protection level meets requirements. 2. The resolution, that is, the number of pulses output per revolution of the encoder, meets the design accuracy requirements. 3. Electrical interface, encoder output mode commonly has push-pull output (F-type HTL format), voltage output (E), open collector (C, common C is NPN-type tube output, C2 is PNP-type tube output), long-line driver Output. Its output should match the interface circuit of its control system. Second, how to use incremental encoder? 1, incremental rotary encoder has a difference in resolution, using the number of pulses generated per revolution to measure, the number from 6 to 5400 or higher, the more the number of pulses, the higher the resolution; this is an important basis for selection one. 2, incremental encoder usually has three signal outputs (differential six signals): A, B and Z, generally use TTL level, A pulse is in front, B pulse is in the back, A, B pulse is 90 degrees apart, each The circle emits a Z pulse
The principle and use of incremental encoder
2021 / 01 / 02
An encoder is a device that converts an angular displacement or a linear displacement into an electrical signal. According to the working principle, the encoder can be divided into two types: incremental (SPC) and absolute (APC). The incremental encoder converts the displacement into a periodic electrical signal, which is then converted into a counting pulse, and the number of pulses is used to represent the magnitude of the displacement. Here is some introduction to incremental encoders. 1. working principle The working principle of the photoelectric incremental encoder is as follows: the pulse code disc rotating together with the rotating shaft has a uniformly engraved grating, and a plurality of transparent sections and shading sections are evenly distributed on the code disc. Incremental encoders do not have a fixed starting zero. The output is a pulse proportional to the increment of the corner. A counter is required to count the number of pulses. Each time a light transmissive area is rotated, a pulse signal is sent, the curren
Incremental encoder phase alignment
2021 / 01 / 02
The output signal of the incremental encoder is a square wave signal, which can be divided into an incremental encoder with a commutation signal and a conventional incremental encoder. The ordinary incremental encoder has a two-phase orthogonal square wave. Pulse output signals A and B, and zero-bit signal Z; Incremental encoder with commutation signal, in addition to the ABZ output signal, also has the number of revolutions per revolution of the electronic commutation signal with 120 degrees difference from each other and the motor rotor The number of magnetic poles is the same. The alignment of the phase of the UVW electronic commutation signal with the incremental encoder with the commutation signal and the phase of the rotor pole, or the phase of the electrical angle are as follows: 1. Use a DC power supply to pass the DC winding of the motor to a DC current less than the rated current, U in, V out, to orient the motor shaft to an equilibrium position; 2. Observe the U phase signal and Z signal of the encoder with an oscilloscope; adjust the relative position of the encoder shaft and the motor shaft, or the relative position of the encoder housing and the motor housing, according to the convenience of operation; 3. While adjusting, observe the U-phase signal edge of the encoder and the Z signal until the Z signal is stable at a high level (in this case, the normal state of the Z signal is low), and lock the encoder to the motor. Positional relationship; Reverse the motor shaft back and forth. After releasing the hand, if the motor shaft is free to return to the equilibrium position each time, the Z signal can be stabilized at a high level, and the alignment is effective. After removing the DC power supply, verify as follows: Observe the U phase signal of the encoder and the UV back EMF waveform of the motor with an oscilloscope; When the motor shaft is rotated, the rising edge of the U-phase signal of the encoder
Distinction between incremental encoder and absolute encoder
2021 / 01 / 01
Encoders can be divided into incremental pulse encoders: SPC and pulse encoders: APC based on the signal principle. Both are generally applied to the detection elements of speed control or position control systems. The distinction between incremental encoders and encoders. An encoder is a device that generates an information expression form according to a given code. It is a device that compiles and converts signals (such as bit streams) or data into signal forms that can be used for communication, transmission, and storage. It is a device that compiles and converts signals (such as bit streams) or data into signals that can be used for communication, transmission, and storage. Here, I recommend several encoders for you to facilitate your purchase. SM-D2100MPEG2 single-channel encoder is an easy-to-use, powerful MPEG-2 encoder. Supports various standard video and audio signals, including analog component S-VIDEO, analog composite video, and mono or analog stereo. The compressed data output format is ASI / SPI. Compression method MPEG-2MP @ ML, the encoder encodes and multiple
From incremental encoder to absolute multiturn encoder - News - Global IC Trade Starts Here
2021 / 01 / 01
Incremental value rotary encoder, also called circular grating, pulse code disc, can be known from these names, it is a circular grating reticle code disc, after rotation, through the light and dark changes of the luminous flux, generate pulses, counting pulses through external devices To incrementally add (or subtract) the number of pulses to measure the angle of rotation. For example, a circular grating engraves 360 engraved lines per week, and one pulse generated by each engraving line is equivalent to 1 degree, and the cumulative pulse is increased by 30, which is 30 degrees in the positive direction. In fact, there are two (or four) optical eyes for reading these reticle lines, and each of the two optical eyes outputs phase A in phase B to determine from which direction the reticle is coming from, and A is ahead of B. Or B is ahead of A, just like the left and right eyes of a person, so that the direction of rotation of the encoder is known, so that the count of the pulse is incremented or decremented, thereby obtaining a true rotation angle. In actual use, the position of phase A and phase B differ by 1/4 pulse period, so that it is 1/4 cycle difference from the positive direction and 3/4 from the opposite direction, which can be used to determine the direction of rotation. If a pulse
DP communication absolute encoder assignment method - Database & Sql Blog Articles
2020 / 04 / 29
DP communication absolute encoder assignment method - Database & Sql Blog Articles Factory direct 0805 red light quality absolutely guaranteed price absolute advantage AD brand ADUM1402ARWZ special treatment original imported absolutely original Programmable Package SG-8018CA(SG7050C) 0.67M~170M
Lathe Z-axis absolute encoder back to reference point - Database & Sql Blog Articles
2020 / 04 / 29
Lathe Z-axis absolute encoder back to reference point - Database & Sql Blog Articles Factory direct 0805 red light quality absolutely guaranteed price absolute advantage AD brand ADUM1402ARWZ special treatment original imported absolutely original Programmable Package SG-8018CA(SG7050C) 0.67M~170M
Detailed graphic analysis encoder correct wiring method
2020 / 04 / 23
Detailed graphic analysis encoder correct wiring method The correct wiring method for the encoder: (1) Correct wiring is very important. Figure 1 shows the wiring principle of the NPN output incremental type E6B2-CWZ6C. Figure 2 shows the actual wiring of the NPN output incremental type E6B2-CWZ6C. The brown line is connected to the positive pole of the power supply and the blue line is connected. The negative pole of the power supply, the black line is connected to input 0.00, the white line is connected to input 0.01, the orange line is connected to input 0.04, and the PLC's COM is connected to the positive pole of the power supply. (2) The following figure shows the actual wiring diagram of the PNP output incremental type E6B2-CWZ6B. The brown line is connected to the positive pole of the power supply, the blue line is connected to the negative pole of the power supply, the black line is connected to input 0.00, the white line is connected to input 0.01, and the orange line is connected to input 0.04. The COM of the PLC is connected to the negative pole of the power supply.
Detailed graphic analysis encoder correct wiring method
2020 / 04 / 23
Detailed graphic analysis encoder correct wiring method The correct wiring method for the encoder: (1) Correct wiring is very important. Figure 1 shows the wiring principle of the NPN output incremental type E6B2-CWZ6C. Figure 2 shows the actual wiring of the NPN output incremental type E6B2-CWZ6C. The brown line is connected to the positive pole of the power supply and the blue line is connected. The negative pole of the power supply, the black line is connected to input 0.00, the white line is connected to input 0.01, the orange line is connected to input 0.04, and the PLC's COM is connected to the positive pole of the power supply. (2) The following figure shows the actual wiring diagram of the PNP output incremental type E6B2-CWZ6B. The brown line is connected to the positive pole of the power supply, the blue line is connected to the negative pole of the power supply, the black line is connected to input 0.00, the white line is connected to input 0.01, and the orange line is connected to input 0.04. The COM of the PLC is connected to the negative pole of the power supply.
Detailed graphic analysis encoder correct wiring method
2020 / 04 / 23
Detailed graphic analysis encoder correct wiring method The correct wiring method for the encoder: (1) Correct wiring is very important. Figure 1 shows the wiring principle of the NPN output incremental type E6B2-CWZ6C. Figure 2 shows the actual wiring of the NPN output incremental type E6B2-CWZ6C. The brown line is connected to the positive pole of the power supply and the blue line is connected. The negative pole of the power supply, the black line is connected to input 0.00, the white line is connected to input 0.01, the orange line is connected to input 0.04, and the PLC's COM is connected to the positive pole of the power supply. (2) The following figure shows the actual wiring diagram of the PNP output incremental type E6B2-CWZ6B. The brown line is connected to the positive pole of the power supply, the blue line is connected to the negative pole of the power supply, the black line is connected to input 0.00, the white line is connected to input 0.01, and the orange line is connected to input 0.04. The COM of the PLC is connected to the negative pole of the power supply.
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Privacy statement: Your privacy is very important to Us. Our company promises not to disclose your personal information to any external company with out your explicit permission.