German Seika encoder Seika model Seika price

The Seika encoder has many optical channel graduations. Each graduation is arranged sequentially with 2 lines, 4 lines, 8 lines, and 16 lines. In this way, at each position of the encoder, by reading the light and dark states of each graduation, a unique 2-ary code (Gray code) is obtained, ranging from the zeroth power of 2 to the n-1th power of 2. This is called an n-bit absolute encoder. Such encoders use an optical code disk for memory. The absolute encoder determines the code based on mechanical position; it requires no memory, no reference point search, and no continuous counting. Whenever the position needs to be known, the position is read directly. This greatly improves the encoder's anti-interference characteristics and data reliability. From single-turn absolute encoders to multi-turn absolute encoders: in a single-turn absolute rotary encoder, the graduations on the optical code disk are measured during rotation to obtain a unique code. When the rotation exceeds 360 degrees, the code returns to the origin, which does not comply with the principle of unique absolute coding. Such coding can only be used for measurements within a rotation range of 360 degrees and is called a single-turn absolute encoder.

Seika encoder principle

An optical encoder is a sensor that implements displacement-to-digital conversion using the principle of grating diffraction. Through photoelectric conversion, it converts the mechanical geometric displacement on the output shaft into pulse digital quantities. Common optical encoders consist of a grating disk, a light-emitting element, and a photosensitive element. The grating is essentially a disk with regular transparent and opaque lines. The luminous flux received by the photosensitive element changes synchronously with the transparent lines. The waveform output from the photosensitive element is shaped into pulse signals, with one pulse output per revolution. Based on pulse changes, equipment displacement can be precisely measured and controlled. Incremental encoders directly use the photoelectric conversion principle to output three sets of square wave pulses: phase A, phase B, and phase Z. The phase difference between the A and B pulse groups is 90º, allowing easy determination of the rotation direction. Phase Z provides one pulse per revolution for reference point positioning. Its advantages include simple structural design, a mechanical average life of tens of thousands of hours or more, strong anti-interference capability, high reliability, and suitability for long-distance transmission. Its disadvantage is the inability to output absolute position information of the shaft rotation.

Seika encoder advantages and disadvantages

(1) Advantages: High precision, high resolution, and high reliability. It can directly output digital codes in a specific format, connect conveniently with microcomputers and digital systems, and is very flexible and easy to use. It is mainly used for measuring various displacements. (2) Disadvantages: (1) The resolution of contact encoders is limited by brushes and cannot be very high; (2) Contact generates friction, resulting in a shorter service life; (3) Contact points do not allow high-speed operation. Therefore, this type of encoder is rarely used.

Seika encoder features

1) After power-up or following internal and external power faults, the encoder does not require a reference drive and can obtain the current accurate position once power is normal. Under interference from various harsh environments, the hollow encoder's original position test data remains stable and is not easily affected by interference. 2) The encoder can provide an incremental pulse code value for each axis position, especially in position control. Incremental encoders do not require counting and can achieve direct internal high-speed reading and external output. Furthermore, subsequent calculation tasks by the receiving device controller can reduce the cost of other additional input components. For example, hollow encoders in multi-axis parallel industrial robots can achieve high-speed multi-axis parallel synchronous operation, as well as in various control fields requiring multi-axis synchronization. 3) Fast and reliable digital data transmission is currently one of the core elements of encoders. Due to their high-resolution characteristics, general hollow encoders output digital signals directly without internal or external counting, so they are no longer affected by pulse reading and accumulation. They can respond at high speeds. For some high-efficiency equipment, hollow encoders can also achieve high-resolution outputs. 4) Additionally, the encoder is a very flexible type, characterized mainly by its compactness and ease of adjustment. Position is generally adjusted flexibly via spring plates. The hollow encoder can determine the rotation direction from the pulse signal values using the A phase pulse signal and the output time of phase B. Currently, hollow encoders are generally suitable for various application scenarios. 5) The clamping method and spring plate structure of this shaft encoder allow for easy position adjustment and absorption of load vibration and shock. Moreover, the hollow encoder outputs based on the shaft's rotational displacement during operation. By combining with the shaft via a coupling, it can directly detect rotational displacement. Typically, no origin reset is required at startup. Under normal conditions, the rotation angle can be output in parallel as an absolute value.

Weidou Intelligent Technology specializes in selling German Seika rotary encoders, Seika incremental encoders, Seika absolute encoders, Seika optical encoders, Seika magnetic encoders, Seika shafted encoders, Seika hollow shaft encoders, Seika contact brush encoders, Seika angle encoders, Seika linear encoders, Seika digital encoders, Seika draw-wire encoders, Seika position encoders, Seika hollow encoders, and Seika main spindle encoders. Seika original imports from Germany. Customers are welcome to inquire and order.