Term description
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Photoelectric encoder |
A sensor that converts the mechanical geometric displacement on the output shaft into a pulse or digital signal through photoelectric conversion |
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Photoelectric angle encoder |
Photoelectric encoders with an angle measurement and an accuracy level is more than 20 ″ (inclusive). |
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Photoelectric rotary encoder |
Photoelectric rotary encoder is used for rotary motion measurement. The absolute encoder accuracy level is below 20 ″ level, and the incremental encoder accuracy level is below 0.05T level. |
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Incremental photoelectric encoder |
A photoelectric encoder that obtains position values by calculating the number of incremental pulse signals from a reference point. |
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Absolute photoelectric encoder |
At any position within the full range, photoelectric encoders with a single-valued function relationship. |
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Single-turn absolute photoelectric encoder |
The measuring range is single-turn absolute photoelectric encoder. |
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Multiple-turn absolute photoelectric encoder |
The measuring range is multi-turn absolute photoelectric encoder. |
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Incremental and absolute hybrid photoelectric encoder |
Photoelectric encoder that simultaneously outputs incremental signals and absolute signals. |
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Integrated photoelectric encoder |
It has a rotating datum, and it is at least a photoelectric encoder composed of three basic parts: a shaft system, a circular grating disk, and a reading head. |
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Solid shaft photoelectric encoder |
The photoelectric encoder whose output shaft is a solid shaft. |
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Hollow shaft photoelectric encoder |
The photoelectric encoder whose output shaft is a hollow shaft. |
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Semi-hollow shaft photoelectric encoder |
The photoelectric encoder whose output shaft is a blind hole. |
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Split photoelectric encoder |
There is no rotating reference, and the photoelectric encoder is composed of at least two basic parts : the circular grating disk and the reading head. |
Basic parameter terms
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Line |
The logarithm of the graduation line of the incremental grating encoder. |
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Pulse number per rotation |
The number of pulses output per revolution of the incremental photoelectric encoder. |
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Bit number per rotation |
The number of bits of the binary code output by the absolute encoder. |
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Maximum rotary speed per minute |
The maximum number of rotations per minute allowed by the photoelectric encoder. |
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Maximum response speed per minute |
The number of mechanical revolutions that reach the electrical limit response frequency of the photoelectric encoder. |
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Index signal |
Pulse signal for marking the absolute position of incremental photoelectric encoder. Note: The incremental photoelectric encoder can have one or more reference marks. |
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Output model |
The type of hardware interface circuit for the photoelectric encoder signal output. |
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Open collector output |
A circuit that uses the transistor emitter as the common terminal and the floating collector as the output terminal. Note: Open collector output is generally divided into NPN open collector and PNP open collector output. |
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Voltage output |
On the basis of the open collector output, a pull-up resistor is installed between the power supply and the collector, and the collector is used as the output terminal. |
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Push-pull output
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The output circuit has two transistors, NPN and PNP. Note: According to [H], [L] of the output signal, the two output transistors alternately perform [ON] and [OFF] actions, which can be slightly farther than the open collector output circuit transmission distance, and can also be input device with the open collector output (NPN, PNP) connection |
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Line driver output |
Adopt differential output, suitable for high-speed, long-distance data transmission output mode. |
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Parallel interface output
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Each cable of the absolute encoder represents one bit, the high or low level represents 1 or 0, and all bits are output in parallel. |
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Synchronization serial output
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Both communication parties have a common clock reference, and can use the clock reference to accurately send and receive data. Note: Usually this clock reference is the synchronous clock line or the same clock source. |
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Asynchronous serial output
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The two parties of communication do not have a common clock reference, and usually need to have a preamble for rate synchronization output every time they send and receive data |
Main parts terms
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Disk |
Usually the material is glass, metal, or film . Serve as a reference for measuring the scale of an optical encoder. |
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Indicative grating |
A series of engraved lines engraved on a carrier such as glass, metal, or film as an incremental photoelectric encoder to indicate the measurement reference. |
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Shaft |
The part that drives the measurement reference to rotate and is used to partially connect with the user. |
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Main body |
Components for supporting other devices of encoder |
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Shell |
Used to protect the internal parts of the encoder from external pollution. |
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Bearing |
It is composed of a main shaft, a main body, and a bearing to obtain a rotating reference. |
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Coupling |
It is used to flexibly connect the encoder output shaft with user's end. |
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Connection plate |
A component used to flexibly connect the encoder body with the fixed end of the object to be measured. |
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Reading head |
A photoelectric conversion device of encoder composed of a light emitting system and a receiving system. |
Technical Term
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Angular resolution |
The ability of the encoder to resolve the two smallest angle values. Note: The angular resolution of the absolute encoder is expressed by the ratio of the full-angle angle value and the output bits of the absolute encoder; the angular resolution of the incremental encoder is expressed by the full-angle angle value and output the number of pulses of the incremental encoder. |
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Output channel |
The output signal number of incremental photoelectric encoder. |
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Output phase difference |
When the encoder is working, the electrical angle difference between the rising and falling edges of the two signals of the A phase and the B phase. |
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Direction of rotation |
From the direction of the shaft end of the photoelectric encoder, the same rotation direction as the clockwise rotation, and the opposite rotation direction is the counterclockwise direction |
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Error of measurement |
The difference between the measured value of the photoelectric encoder and the theoretical value. |
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Error of the uniformity of pulses |
The difference between the measured pulse period To and the theoretical value T of the photoelectric encoder. |
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Allowed angle rotary acceleration |
The maximum angular velocity increase per time allowed by encoder. |
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Maximum response frequency |
The highest frequency reached by the photoelectric encoder. |
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