Incremental encoder is commonly used, and absolute encoder is used if there are strict requirements on position and zero position. Servo system should be analyzed in detail, depending on the application situation. Commonly used incremental encoder for speed measurement, which can be used for infinite accumulation measurement; Absolute encoder is used for position measurement, and the position is unique (single or multiple turns). Finally, it depends on the application situation and the purpose and requirements to be realized.
Multi turn absolute encoder. The encoder manufacturer uses the principle of clock gear mechanism. When the central code plate rotates, another group of code plates (or multiple sets of gears, multiple groups of code disks) are driven through the gear, and the number of turns is added on the basis of single cycle coding to expand the measurement range of the encoder. Such an absolute encoder is called a multi turn absolute encoder, which is also determined by the mechanical position, Each...
Encoder connection cable fault: this kind of fault is the most likely to occur, which is often encountered in maintenance and should be the priority factor. Usually, the encoder cable is open circuit, short circuit or poor contact, so the cable or connector should be replaced. Special attention should also be paid to whether it is due to the loose fixation of the cable, resulting in open welding or open circuit. In this case, the cable should be clamped tightly.
"The encoder is generally divided into incremental encoder and absolute value encoder. The output mode of incremental encoder includes RS422, push-pull HTL, push-pull and NPN collector open circuit output; the output code system of absolute value encoder is generally binary code, also has gray code, and the output logic includes positive logic, negative logic and SSI.
Classification by encoder mechanical installation form(1) Shaft type: shaft type can be divided into clamping flange type, synchronous flange type and servo installation type.(2) Shaft sleeve type: shaft sleeve type can be divided into half empty type, full empty type and large diameter type.
Rotate incremental encoder to output pulse when rotating, and know its position by counting equipment. When encoder is stationary or power failure, it depends on the internal memory of counting equipment to remember the position. In this way, after power failure, the encoder can't move at all, and when the incoming call works, the encoder can't lose the pulse due to interference in the process of outputting the pulse. Otherwise, the memory zero of the counting equipment will shift, and the...
According to the working principle, encoders can be divided into incremental and absolute types. Incremental encoder converts displacement into periodic electrical signal, and then converts this electrical signal into counting pulse, and the displacement is expressed by the number of pulses. Each position of the absolute encoder corresponds to a certain digital code, so its indication value is only related to the starting and ending positions of measurement, and has nothing to do with the...
Encoders are generally divided into incremental encoder and absolute encoder, which have the biggest difference: in the case of incremental encoder, the position is determined by the number of pulses calculated from the zero mark, while the position of absolute encoder is determined by the reading of output code. In a circle, the reading of the output code of each position is unique; Therefore, when the power supply is turned off, the absolute encoder is not separated from the actual position....
The rotary incremental encoder outputs pulses when rotating, and the position is known by the counting device. When the encoder does not move or the power is off, the internal memory of the counting device is used to remember the position. In this way, when the power is cut off, the encoder cannot move in any way. When the power is called to work, the encoder can not lose the pulse due to interference during the output pulse process. Otherwise, the zero point memorized by the counting device...
Magneto static absolute encoder Advantages: moderate volume, direct measurement of linear displacement, absolute digital coding, no limitation of theoretical range; no contact, no abrasion, anti harsh environment, can be used under 1000 meters; rich interface forms, various measurement methods; acceptable price. Disadvantages: the resolution of 1 mm is not high; different types of straight lines and angles should be used; it is not suitable for displacement detection (greater than 260 mm) in...
Photoelectric encoder Advantages: small size, precision, high resolution, no contact and no wear; the same type can detect angular displacement and linear displacement with the help of mechanical conversion device; multi turn photoelectric absolute encoder can detect a long range of linear displacement (such as 25 bit multi turn). Long service life, random installation, rich interface forms and reasonable price. Mature technology has been widely used at home and abroad many years ago....
At present, the encoder used in elevator is mainly incremental encoder, which is used together with frequency converter or other speed control system to provide speed and position information for speed control system or control system. Generally, frequency divider is added for pulse equivalent conversion. Encoder installation is mainly coaxial connection with traction motor to measure speed and feedback of motor. Now the door motor of frequency conversion door system is also equipped with...
An encoder is a device that compiles signals (such as bit streams) or data and converts them into signal forms that can be used for communication, transmission and storage.Encoder converts angular displacement or linear displacement into electrical signals, the former is called code wheel and the latter is called code scale.
Grating rotary encoder controller Absolute rotary encoder Installation of low speed end: it is installed after the reduction gear, such as the shaft end of the winding wire rope drum or the shaft end of the last reduction gear. This method has no gear to return the clearance, and the measurement is more direct and accurate. This method generally measures long-distance positioning, such as positioning of various lifting equipment and feeding trolley.
The main performance requirements of encoder are: high precision, high sensitivity, reliable work, good stability, strong anti-interference ability, good dynamic characteristics, simple structure and low cost. The main items to be checked include: appearance; starting moment of main shaft; allowable speed; allowable axle load (axial and radial); inertia moment; vibration resistance; shock resistance; high temperature resistance; anti-interference ability; power voltage adaptability; current...
Working principle and function of encoder: it is a rotary sensor that converts rotary displacement into a series of digital pulse signals. These pulses can be used to control angular displacement. If the encoder is combined with gear bar or screw, it can also be used to measure linear displacement.
Function of rotary encoder in elevator 1).It is used to monitor the elevator speed and realize the closed-loop control 2).Some elevators also use rotary encoder to measure the speed and cooperate with the brake device to realize the upward overspeed protection.
When the elevator is debugged, it runs from the lowest floor to the highest floor at a low speed, and the pulse number of each floor height is put into the control system. When the motor rotates, the encoder can get the output pulse which is directly proportional to the elevator running distance. The encoder will send the pulse to the frequency converter or other governors for operation and adjustment, and the elevator can slow down and select the floor. Among them, the pulse number of...
The absolute encoder outputs multi-bit digital code (gray code or pure binary code), and the parallel output means that there are many high and low level outputs on the interface to represent digital 1 or 0. For the absolute encoder with low number of bits, the digital code is generally output directly in this form, which can directly enter the I/O interface of PLC or upper computer, with immediate output and simple connection.
The encoder corrects the reference position into the memory position of the counting device every time it passes the reference point. Before the reference point, the accuracy of the position cannot be guaranteed. For this reason, in industrial control, there are methods such as finding the reference point first, turning on the machine and changing it.
In practice, the faults caused by rotary encoder are not a few, and it is quite troublesome to check. Sometimes, although it has been checked, it is still not reassuring. Therefore, I would like to introduce a simple method to confirm the rotary coding fault. From the schematic diagram of the drive and regulation system, it can be clearly seen that it is because of the rotary coding that the microcomputer inverter motor is between. If there is a problem with the rotary encoder, the abnormal...
bearing absolute encoder SJ50 12bit 4096ppr CW,NPN output ,DC12V 1) Advantages 1, Certification: CE & ISO9001 & SGS. 2, Feature: small volume, sturdy and durable, optional various output mode, long service life, low price,etc. 3, Application: textile industry, packing machinery,production line, etc., for automation control. ...
Product Description S18 mini size solid shaft encoder 1) Advantages 1, Certification: CE& ISO9001 & SGS. 2, Feature: microminiature, logical compact configuration and easy to install. 3, Application: subminiature motor, small instrument, etc., for automation control 2) S18- Series Encoder Specification
ZYS bearing test machine adopt the computer auto control which can preset the load, speed and time etc. according to the actual working state of bearings so as to have the auto control to the bearing temperature, vibration and main motor current. The test data may be saved and printed automatically. When the tested bearing fails or the machine...
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bearing absolute encoder SJ50 12bit 4096ppr CW,NPN output ,DC12V 1) Advantages 1, Certification: CE & ISO9001 & SGS. 2, Feature: small volume, sturdy and durable, optional various output mode, long service life, low price,etc. 3, Application: textile industry, packing machinery,production line, etc., for automation control. ...
Product Description S18 mini size solid shaft encoder 1) Advantages 1, Certification: CE& ISO9001 & SGS. 2, Feature: microminiature, logical compact configuration and easy to install. 3, Application: subminiature motor, small instrument, etc., for automation control 2) S18- Series Encoder Specification
High-quality encoders are devices that encode signals (such as bitstreams) or data and convert them into signals that can be used for communication, transmission and storage. The encoder converts either angular displacement or linear displacement...
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