An encoder is a device that compiles or converts a signal (such as a bit stream) or data into a signal that can be used for communication, transmission, and storage. The encoder converts the angular displacement or linear displacement into electrical signals. The former is called the encoder and the latter is called the encoder. According to the readout method, the encoder can be classified 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. Incremental encoders convert the displacement into a periodic electrical signal, then convert this electrical signal into a counting pulse, and use the number of pulses to indicate the magnitude of the displacement. Each position of the absolute encoder corresponds to a definite digital code, so its indication is only related to the starting and ending positions of the measurement, and has nothing to do with the middle process of the measurement.
It is a rotary sensor that converts rotational displacement into a series of digital pulse signals that can be used to control angular displacement. If the encoder is combined with a gear bar or screw, it can also be used to measure linear displacement.
After the encoder generates the electrical signal, it is processed by the CNC, the programmable logic controller PLC, and the control system. These sensors are mainly used in the following areas: machine tools, material processing, motor feedback systems, and measurement and control equipment. The angular displacement conversion in the ELTRA encoder uses the photoelectric scanning principle. The reading system is based on the rotation of a radial index plate, which consists of alternating light-transmissive windows and opaque windows. The system is all illuminated with an infrared light source vertically so that the light projects the image on the plate onto the surface of the receiver. The receiver is covered with a grating, called a collimator, which has the same window as the disc. The receiver's job is to sense the light changes produced by the rotation of the disc and then convert the light changes to corresponding electrical changes. In general, 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 broken (no output), the inverter cannot work normally, and it becomes very slow. Moreover, the inverter protection will show the “PG disconnected†joint action to work. To make the electrical signal rise to a higher level and generate square wave pulses without any interference, this must be handled with electronic circuitry. The connection between encoder pg wiring and the parameter vector converter and encoder pg must correspond to the type of encoder pg. In general, the encoder pg model differential output, open collector output and push-pull output three, the signal transmission method must take into account the converter pg card interface, so choose the right pg card model or set a reasonable.
Encoders are generally divided into incremental type and absolute type. They have the biggest difference: In the case of incremental encoders, the position is determined by the number of pulses that are counted from the zero mark, and the absolute encoder position is Determined by the reading of the output code. In a circle, the reading of the output code for each position is unique; therefore, when the power is off, the absolute encoder is not separated from the actual position. If the power is turned on again, the position reading is still current and valid; unlike the incremental encoder, it is necessary to look for the zero mark.
The series of encoder manufacturers are all very complete, and are generally dedicated, such as elevator-specific encoders, machine-specific encoders, servo-motor-specific encoders, etc., and the encoders are all intelligent, with a variety of parallel The interface can communicate with other devices.
An encoder is a device that converts angular or linear displacement into electrical signals. The former becomes a dial and the latter is called a yardstick. In accordance with the readout encoder can be divided into contact and non-contact two. The contact type adopts the brush output. A brush contacts the conductive area or the insulating area to indicate whether the status of the code is "1" or "0"; the non-contact receiving sensitive element is a photosensitive element or a magnetosensitive element, and when the photosensitive element is used, Transmissive areas and opaque areas indicate whether the status of the code is "1" or "0".
According to the principle of operation, encoders can be classified into two types: incremental and absolute. Incremental encoders convert the displacement into a periodic electrical signal, then convert this electrical signal into a counting pulse, and use the number of pulses to indicate the magnitude of the displacement. Each position of the absolute encoder corresponds to a definite digital code, so its indication is only related to the starting and ending positions of the measurement, and has nothing to do with the middle process of the measurement.
An incremental encoder is rotated to output pulses as it rotates, and its position is known by the counting device. When the encoder is not moving or is powered 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 have any movement. When the caller works, the encoder can't lose the pulse during the output pulse process. Otherwise, the zero point of the memory of the counting device will shift, and this bias There is no way to know the amount of shift, and only after the wrong production results appear. The solution is to increase the reference point, and each time the encoder passes the reference point, the reference position is corrected into the memory position of the counting device. Before the reference point, the accuracy of the location cannot be guaranteed. For this reason, in the industrial control, there are methods such as finding a reference point for each operation, and starting the change. Such an encoder is determined by the mechanical position of the encoder and is not affected by power outages or interference.
The uniqueness of each position of the absolute encoder determined by the mechanical position, it does not need to remember, does not need to find the reference point, and does not need to count constantly, when need to know the position, when will read its position. In this way, the anti-jamming characteristics of the encoder and the reliability of the data are greatly improved.
Because the absolute encoder is obviously superior to the incremental encoder in positioning, it has been increasingly used in industrial control positioning. Absolute encoders have high accuracy because of their high number of output digits. If parallel output is still used, each output signal must ensure good connection, and must be isolated for more complex conditions. The number of connected cable cores is large. Bring a lot of inconvenience and reduce reliability, therefore, the absolute encoder in the multi-digit output type, generally select the serial output or bus type output, the absolute encoder serial output produced by Germany is the most commonly used SSI (synchronous string Line output).
Multi-turn absolute encoder. Encoder manufacturers use the principle of watch gear machines. When the center code wheel rotates, another set of code wheels (or multiple sets of gears, multiple sets of code plates) is transmitted through the gears, and the number of turns is increased on the basis of the single-turn code. Encode to increase the measuring range of the encoder. Such an absolute encoder is called a multi-turn absolute encoder. It is also determined by a mechanical position determination code. Each position code is unique and does not need to be memorized. Another advantage of the multi-turn encoder is that due to the large measurement range, the actual use is often more affluent, so that it is not necessary to laboriously find the zero point during installation, and it is possible to use an intermediate position as a starting point, which greatly simplifies the difficulty of installation and debugging. The multi-turn absolute encoder has obvious advantages in length positioning and has been increasingly used in industrial control positioning.
It is a rotary sensor that converts rotational displacement into a series of digital pulse signals that can be used to control angular displacement. If the encoder is combined with a gear bar or screw, it can also be used to measure linear displacement.
After the encoder generates the electrical signal, it is processed by the CNC, the programmable logic controller PLC, and the control system. These sensors are mainly used in the following areas: machine tools, material processing, motor feedback systems, and measurement and control equipment. The angular displacement conversion in the ELTRA encoder uses the photoelectric scanning principle. The reading system is based on the rotation of a radial index plate, which consists of alternating light-transmissive windows and opaque windows. The system is all illuminated with an infrared light source vertically so that the light projects the image on the plate onto the surface of the receiver. The receiver is covered with a grating, called a collimator, which has the same window as the disc. The receiver's job is to sense the light changes produced by the rotation of the disc and then convert the light changes to corresponding electrical changes. In general, 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 broken (no output), the inverter cannot work normally, and it becomes very slow. Moreover, the inverter protection will show the “PG disconnected†joint action to work. To make the electrical signal rise to a higher level and generate square wave pulses without any interference, this must be handled with electronic circuitry. The connection between encoder pg wiring and the parameter vector converter and encoder pg must correspond to the type of encoder pg. In general, the encoder pg model differential output, open collector output and push-pull output three, the signal transmission method must take into account the converter pg card interface, so choose the right pg card model or set a reasonable.
Encoders are generally divided into incremental type and absolute type. They have the biggest difference: In the case of incremental encoders, the position is determined by the number of pulses that are counted from the zero mark, and the absolute encoder position is Determined by the reading of the output code. In a circle, the reading of the output code for each position is unique; therefore, when the power is off, the absolute encoder is not separated from the actual position. If the power is turned on again, the position reading is still current and valid; unlike the incremental encoder, it is necessary to look for the zero mark.
The series of encoder manufacturers are all very complete, and are generally dedicated, such as elevator-specific encoders, machine-specific encoders, servo-motor-specific encoders, etc., and the encoders are all intelligent, with a variety of parallel The interface can communicate with other devices.
An encoder is a device that converts angular or linear displacement into electrical signals. The former becomes a dial and the latter is called a yardstick. In accordance with the readout encoder can be divided into contact and non-contact two. The contact type adopts the brush output. A brush contacts the conductive area or the insulating area to indicate whether the status of the code is "1" or "0"; the non-contact receiving sensitive element is a photosensitive element or a magnetosensitive element, and when the photosensitive element is used, Transmissive areas and opaque areas indicate whether the status of the code is "1" or "0".
According to the principle of operation, encoders can be classified into two types: incremental and absolute. Incremental encoders convert the displacement into a periodic electrical signal, then convert this electrical signal into a counting pulse, and use the number of pulses to indicate the magnitude of the displacement. Each position of the absolute encoder corresponds to a definite digital code, so its indication is only related to the starting and ending positions of the measurement, and has nothing to do with the middle process of the measurement.
An incremental encoder is rotated to output pulses as it rotates, and its position is known by the counting device. When the encoder is not moving or is powered 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 have any movement. When the caller works, the encoder can't lose the pulse during the output pulse process. Otherwise, the zero point of the memory of the counting device will shift, and this bias There is no way to know the amount of shift, and only after the wrong production results appear. The solution is to increase the reference point, and each time the encoder passes the reference point, the reference position is corrected into the memory position of the counting device. Before the reference point, the accuracy of the location cannot be guaranteed. For this reason, in the industrial control, there are methods such as finding a reference point for each operation, and starting the change. Such an encoder is determined by the mechanical position of the encoder and is not affected by power outages or interference.
The uniqueness of each position of the absolute encoder determined by the mechanical position, it does not need to remember, does not need to find the reference point, and does not need to count constantly, when need to know the position, when will read its position. In this way, the anti-jamming characteristics of the encoder and the reliability of the data are greatly improved.
Because the absolute encoder is obviously superior to the incremental encoder in positioning, it has been increasingly used in industrial control positioning. Absolute encoders have high accuracy because of their high number of output digits. If parallel output is still used, each output signal must ensure good connection, and must be isolated for more complex conditions. The number of connected cable cores is large. Bring a lot of inconvenience and reduce reliability, therefore, the absolute encoder in the multi-digit output type, generally select the serial output or bus type output, the absolute encoder serial output produced by Germany is the most commonly used SSI (synchronous string Line output).
Multi-turn absolute encoder. Encoder manufacturers use the principle of watch gear machines. When the center code wheel rotates, another set of code wheels (or multiple sets of gears, multiple sets of code plates) is transmitted through the gears, and the number of turns is increased on the basis of the single-turn code. Encode to increase the measuring range of the encoder. Such an absolute encoder is called a multi-turn absolute encoder. It is also determined by a mechanical position determination code. Each position code is unique and does not need to be memorized. Another advantage of the multi-turn encoder is that due to the large measurement range, the actual use is often more affluent, so that it is not necessary to laboriously find the zero point during installation, and it is possible to use an intermediate position as a starting point, which greatly simplifies the difficulty of installation and debugging. The multi-turn absolute encoder has obvious advantages in length positioning and has been increasingly used in industrial control positioning.
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