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　　Category rotary encoders There are many, their properties substantially the same, but there are differences in the use of the process, and today we incremental rotary encoder works to explain to you, we hope for incremental rotary the encoder can understand and correct application of incremental rotary encoder.
　　Incremental rotary encoder accepts its conversion tube angle encoder timing and phase relationships through internal two photosensitive give the angle encoder angular displacement increased (positive direction) or decrease (negative direction). Especially after joining the digital circuit is a single chip, incremental rotary encoder measures the angle and angular velocity measurements comparing absolute rotary encoder is more cheap and easy advantage.
　　The following figure shows the inner workings of incremental rotary encoder

　　A, B two o'clock corresponding to two photosensitive receiving pipe, A, B two o'clock spacing S2, the grating pitch angle encoder, respectively, S0 and S1.
　　When the angle encoder to a uniform rotation speed, so we can see the output waveform of the S0: S1: S2 ratio of actual chart S0: S1: S2 ratio the same, similarly to other angle encoder when the speed of uniform rotation, the output waveform of the S0: S1: S2 ratio of actual chart S0: S1: S2 ratio remains the same. If the angle encoder do variable motion, see it become more motion cycles (defined below) combination, then each movement cycle of the output waveform of the S0: S1: S2 ratio of actual chart S0: S1: S2 The ratio remains the same.
　　It found that each motion cycle by timing the output waveform is

　　We put the current A, B output value is stored together with the next A, B output value of the comparison, you can easily obtain the direction of movement of the code wheel angle,
　　If the grid of S0 equal to S1, S0 and S1 is the same angle in radians, S0 and S2 equal to 1/2, then obtain the angle encoder motion displacement angle is the angle in radians S0 1/2, except the time to eliminate the coin, we get the angle encoder motion displacement angular velocity.
　　S0 is equal to S1, S2 and S0 is equal to 1/2, 1/4-cycle sport you can get the direction of movement and displacement angle position, if not equal to S0 S1, S2 S0 is not equal to 1/2, then to a motion cycle before they can get the direction of movement of the position and angle of displacement.
　　Incremental rotary encoder works: from the center of a photoelectric encoder shaft on which a ring through dark engraved lines, optoelectronic transmitting and receiving device to read, get a sine wave signals into four groups A, B , C, D, each sine wave phase difference of 90 degrees (with respect to a cycle of 360 degrees), the C, D inverted signal, superimposed on a, B on the two-phase, can enhance stabilization signal; other per revolution Z-phase pulse to represent a zero reference position. Since the A, B two-phase difference of 90 degrees, the first phase A or B by comparing the first phase, in order to determine the encoder forward and reverse, the zero pulse can be obtained encoder zero reference position.
　　After reading about what we believe is the incremental rotary encoders and rotary encoders incremental understand the working principle, if there are problems incremental rotary encoder applications may at any time with the Guangdong Granville electronic products company technical consultation and discussion.