Encoder (pvi)
The coding principle
A central axle-based optical code disk, with circular, dark engravings, and a photo-launching and receiver reading, combines four sets of sine wave signals with a 90-degree phase difference (compared to a weekly wave of 360 degrees) and reverses the c, d signals, superseding them on the a, b and b phases, which enhances the stability of the signals; and a z-phase pulse from each transfer to represent the zero-bit reference。
Because of the difference of 90 degrees between a and b, a zero reference point for encoders can be obtained by comparing a to b to determine the positive and reverse of encoders。
The working principles of the pv encoder
Working principle: when the pv encoder turns, both a and b lines produce a 90-degree azimuth of pulse output a and b, which allows the pv encoder to rotate in the direction of the power. If the a-pulse is positive before the b-pulse, the pv encoder is positive or reverse. Z-line is generating a pulse at each turn of the zero-pulse pv encoder. A-line is used to measure pulses of b-lines and a-lines.
Incremental encoder works
Incremental encoders are the direct use of the pv principle for the output of three sets of aerobic pulsations a, b and z; the 90-year pulsive phase difference between a and b sets of two sets of abrasives is less than radiant? The symmetrical is one pulse per rotation and is used for base point positioning. It has the advantage of being simple in principle, having an average mechanical lifetime of tens of thousands of hours or more, and having a high resistance to interference, reliability and suitability for long-range transmission. The disadvantage is that it is not possible to output position information on the axis。
The principle of the code
The encoder is the sensor for the direct output of numerical volumes, and there are several concentric comprehensible paths along its circular coding discs, each of which consists of a swath of light and unlighted fan zones, with the number of sections in the adjacent coding channel being double the number of places of its binary digital numbers, on one side of the coding being a light source and on the other side of each channel having a light-sensitive component; when the coding is in different positions, the light-sensitized elements convert the corresponding electro-sensitization signals to the light-rece or not. This encoder is characterized by the absence of a counter, which can read a fixed digital code at any point in the axis. It is clear that the more the code, the higher the resolution, the more the code will be, and that for an encoder with a n-bit binary resolution, it must have a n-bar. There are currently 16-bit encoder products in the country。
The principle of the code
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