The resolution of the encoder is how much signal output one revolution, the turntable rotating accuracy, is the resolution of the encoder, which is linear displacement measuring accuracy, the resolution of the encoder, can control the machine more accurate precision and the performance of the servo motor, encoder, better optimization performance, so is the size of the encoder resolution an important performance.
The change of the encoder resolution encoder set consists of A number of grating lines, there are two or four light eyes read A, B signal, linear density determines the incremental encoder resolution, minimal change Angle can also distinguish between the value of reading.
Said the incremental encoder resolution parameter is the PPR, per pulse number, for example, each lap 360 rows, each row pulse pulse of A, B output, resolution parameter of 360 PPR.
So what is the minimum Angle change encoder?
A/B of the encoder output waveform generally have two kinds, one kind is along the steep rise, the square wave signal fell sharply, slowly rising and falling, sine/cosine curve waveform signal output waveform is similar to sine curve, A and B is 90 degrees 1/4 t cycle phase, if Sin is A sine curve, B is the cosine of the cosine curve, square wave signal A, B phase (phase difference of 90 degrees
1 / 4 t)
, so the phase Angle 0 degrees, 90 degrees, 180 degrees, the phase Angle of 270 degrees, the rise and fall four, so, in fact, it can be seen that the square wave 1/4 T periodic change point of view, such as a quarter cycle of T is the smallest measure distance, through the circuit of the rising and falling of judgment, can be changes in the Angle of PPR read four times, this is a four square wave frequency.
This judgment can also use logic, 0 represents the low, another high representative, A/B phase in A cycle of change is 00,01,11,10.
Not only can this judgment is 4 times, but also determine the direction of rotation.
Then, the minimum resolution of square wave signal Angle = 360 degrees/(
Question: in front of the square wave output of 360 A/B PPR incremental encoder, the minimum resolution Angle = 0.
Encoder outputs A/B/Z square wave, can also be 4 times again, but please note that the encoder speed required for segmentation requirement is low.
In addition, such as the original line accuracy is not high, the waveform is not perfect, or the breakdown of circuit itself, the fault may be serious distortion, the step size, lost step, select and use need to pay attention to.
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