Incremental Encoders

What is an Incremental Encoder? Working Principle, Application Scenarios, and Domestic Solutions

2025-12-14

In industrial automation and motion control systems, the **incremental encoder** is an extremely widely used position and velocity feedback device. By outputting continuous pulse signals, it provides real-time feedback on the rotational speed, direction, and relative displacement of shafts, making it one of the fundamental sensing components in CNC equipment, automated production lines, and mechanical control systems. With the maturation of domestic automation systems, domestically produced incremental encoders—known for their stable performance and engineering adaptability—have gradually emerged as viable alternatives to imported products. I. What is an Incremental Encoder? An incremental encoder is a type of encoder that measures motion status through changes in pulse signals. Its core characteristics include: Unlike absolute encoders, incremental encoders do not directly output absolute position values. Instead, they measure relative displacement by accumulating pulses. II. Typical Technical Forms of Incremental Encoders In engineering applications, incremental encoders...

POG10DN1024I: Incremental encoder with solid shaft, B10 flange

2024-07-16

The number of encoder replacement inquiries has gone up a bit lately, tending towards standard products now. This is an incremental encoder, model POG10DN1024I, a solid shaft with B10 flange. This model is also said to be in the discontinued sequence this time, and this is one of three models for which discontinuation feedback has been received. This time, the replacement customization commission is a steel company, and the replacement plan has been given a month ago. Due to the time constraints, the customer was in a hurry as their inventory was already insufficient. The customer's quantity was objective, so a 1:1 replica scheme was used for this customized replacement. It is almost identical in appearance with only slight minor differences. The custom encoder solid shaft measures 11mm and has a keyway. It comes with a large terminal box and is identical to the original. The pulse is 1024, which is the common pulse number used by the customer, and the B10 flange size is 115mm with a tab of 85mm. After more than a month of...

Line, bit and resolution concepts of incremental encoders

2022-09-19

Incremental encoder line, bit, the concept of resolution I. Incremental encoder line Encoder disk of the week engraved line, incremental disk engraved line can be 10 lines, 100 lines, 2500 lines of engraved lines, as long as the disk can be engraved, you can choose the number of; Absolute value of the disk of the disk engraved line due to the Gray code arrangement of the way the method, decided to decide that it is basically a power of 2 lines, such as 256 lines, 1024 lines, 8192 lines, etc. SSI signal conversion monitor through the coupling and other coupling parts of the encoder shaft and the measured shaft synchronous rotation. SSI signal conversion monitor through the coupling and other coupling parts will be the encoder shaft and the drum shaft or pinion shaft coupling, so that the encoder and the measured shaft synchronous rotation, the measured shaft rotation into the encoder shaft rotation, through the special tester to collect the encoder value so as to accurately measure the displacement of the measured parts. And achieve the purpose of real-time measurement and control of the displacement of the measured parts. It is suitable for measuring the lifting height of all kinds of windlasses and screw closure gates. But the absolute value code disk also has special Gray residual code output, such as...

Basic waveform and circuit analysis of incremental encoders

2022-09-19

Basic waveform and circuit analysis of incremental encoders Incremental encoders are sensors that output in the form of pulses. The outer and middle channels of the code disk of an absolute encoder have the same number of uniformly distributed light-transmissive and light-impermeable sectors, but the two sectors are staggered by half a sector from each other. When the code disk rotates, its output signals are the phase A and B pulse signals with a phase difference of 90° and the pulse signal generated by the third code channel with only one light-transparent slit. From the phase relationship between the A, B two output signals can be judged from the direction of rotation (direction). When the code disk is rotating positively, the pulse waveform of channel A is π/2 ahead of channel B, and when it is rotating negatively, the pulse of channel A lags π/2 behind channel B. The actual circuit is to use the positive pulse generated by triggering the monostable at the lower edge of the plastic waveform of channel A to phase with the plastic waveform of channel B. When the code disk is rotating positively, only the forward pulse of the mouth is output, and vice versa, only the reverse pulse of the mouth is output. The binary encoder is based on the input...

SAH78 and SAH90 Heavy-Duty Incremental Encoders

2021-09-08

Heavy-duty rugged shaft encoders, resistant to seawater and tropical climates EX explosion-proof encoders EX II 2G Ex ib IIB T4 Gb Precise photoelectric or magnetic sensing technology, excellent electromagnetic compatibility Up to 10,000 pulses per revolution (P/R) Overvoltage, overcurrent, and surge protection Robust metal housing, dual bearing design, protection rating up to IP68 Equipped with reverse short-circuit and short-circuit protection, effectively mitigating installation errors affecting the encoder Product Specifications (SAH78A / SAH90A Series) Product Series SAH78A SAH90A Flange Characteristics (Housing) Ø 78mm Ø 90mm Shaft Dimensions Shaft Type Ø 10, 11, 12, 15mm Housing Material Aluminum Alloy (Optional Stainless Steel Housing) Sensing Principle Optical or Magnetic Power Supply Voltage 5V ± 5% 10~30VDC, ...

Small Incremental Encoders SAH24S, 25S, 28S, 32S

2021-09-08

Features and applications: Precision optical sensing Ultra-compact solid shaft encoder Pulse counts up to 2500 P/R, ultra-high interference immunity Polymer optical encoder, excellent shock resistance, IP65 protection Especially suitable for confined environments, reducing installation space and saving costs.

Large aperture type incremental encoders SAH66, SAH80, SAH90

2021-09-08

Features and applications: Rugged, heavy-duty incremental encoders with apertures up to 45 mm Through-hole encoders with flexible apertures Pulse counts up to 8192 P/R, ultra-high interference immunity Polymer encoders, excellent shock resistance, protection up to IP66 Perfect for all kinds of ports, metallurgy, mines, steel mills, oilfields and automation industries, EX Explosion-Proof encoders.

Standard incremental encoder SAH58

2021-09-08

Features and Applications: Precise photoelectric sensing, customizable Through-hole encoder, flexible customizable aperture Pulse count up to 16,000 P/R, ultra-high interference immunity High-polymer grating, superb shock resistance, protection up to IP68 More flexible mounting, more convenient to use, widely used in a variety of automation industries, EX Explosion-Proof Encoder

Standard incremental encoder SAH50

2021-09-08

Features and Applications: Precision optical sensing Shaft and through-hole encoders Pulse counts up to 5000 P/R, ultra-high interference immunity High-polymer optical encoder, superb vibration resistance, protection class up to IP65 Flexible mounting, more convenient to use, widely used in a variety of automation industries.