What is the theory of incremental encoder！

Incremental encoder
Incremental encoder, sometimes called a relative encoder, designed to be simpler than the absolute encoder. It consists of two rails and two who is called the sensor output channels A and B with the axis of rotation, according to the frequency of trains on these channels is proportional to the shaft speed occurs, and the phase relationship between the signals generated rotation. The code disc pattern and output signals A and B in Figure 5 by counting the number of pulses and the resolution of known disk shown angular movement, can be determined. A and B channels are used for assessing which channels to determine the direction of rotation "leads to" the other side. From the signals of two channels are 1/4 period of phase with each other and are called quadrature signal. Typically the third output channels, known as INDEX, click the yield per revolution, which is useful in full computing revolution. As a reference, to define a zero position or home base station is useful.
It shows two separate tracks A and B channels, and the more common configuration uses a single track with the A and B sensor offset on the track 1/4 cycle to produce the same signal pattern. Single track code disk is simpler and cheaper manufacturing.
Quadrature signals A and B can be decoded to produce a direction of rotation in different ways sequence logic circuit provides three different resolutions in the decoded output pulse A converter of FIG. 6 and B hown: 1X, 2X, 4X. 1X resolution provided only a single click of a signal in each cycle A or B, 4X the resolution provided by the two signals A and B each edge transition 1X provide four times the resolution. (Clockwise or counterclockwise) is to determine the direction of the transition in the edge of the second signal by the level of a signal. For example, in 1X mode, A = \ DownArrow Chinese clockwise as represented by B = 1, B = \ A = 1 and counter-clockwise Press DownArrow Chinese. If we only have a single output channel A or B, it will be impossible to determine the direction of rotation. In addition, around the edge jitter signal transmission shaft can lead to erroneous single pulse.

TRD-J100-RZV
TRD-J100-RZVC
TRD-J100-RZVCW
TRD-J100-RZVS
TRD-J100-RZVW
TRD-J100-RZVWS
TRD-J100-RZW
TRD-J100-RZWL
TRD-J100-RZWS
TRD-J100-RZWSL
TRD-J100-S
TRD-J100-SC
TRD-J100-SCW
TRD-J100-SS
TRD-J100-SW
TRD-J100-SWS
TRD-J1024-RZV
TRD-J10-S
TRD-J10-SC
TRD-J10-SCW
TRD-J10-SS
TRD-J10-SW
TRD-J10-SWS
TRD-J120-RZ

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