German KCI encoder KCI model KCI price

KCI encoders convert displacement into periodic electrical signals, which are then converted into counting pulses, with the number of pulses indicating the magnitude of displacement. According to their working principle, encoders can be divided into incremental and absolute types. Incremental encoders convert displacement into periodic electrical signals, which are then converted into counting pulses, with the number of pulses indicating the magnitude of displacement. An encoder is a device that converts angular or linear displacement into electrical signals. The former is called a code disk, and the latter a code scale. According to the readout method, encoders can be divided into contact and non-contact types. Contact types use brush outputs, where a brush contacting a conductive or insulating area indicates whether the code status is "1" or "0"; non-contact types use photosensitive or magnetosensitive elements as receiving sensors. When using photosensitive elements, transparent and opaque areas indicate whether the code status is "1" or "0".

KCI encoder principle

Magnetic encoders use magnetoelectric design, generating or providing the position and speed of the actuator (servo motor) through changes in the magnetic field of magnetic induction devices. The physical working principle of magnetic encoders is the magnetoresistive effect. This effect arises because current-carrying conductors or semiconductors have internal charge carriers subject to external Lorentz forces, causing their trajectories to deflect or spiral, thereby changing the potential difference within the conductor or semiconductor. This is a microscopic manifestation; macroscopically, any change in the external magnetic field causes a corresponding change in magnetoresistance. This is the magnetoresistive effect of magnetic encoders. The magnetoresistive components in magnetic encoders include semiconductor magnetoresistive devices and ferromagnetic magnetoresistive devices. Thus, the detection probe of a magnetic encoder uses a magnetoresistive device as its magnetic head. Currently, common magnetoresistive heads for magnetic encoder probes include Giant Magnetoresistance (GMR) heads (GMR) and Anisotropic Magnetoresistance (AMR) heads (AMR). However, due to advantages such as better frequency characteristics and higher sensitivity compared to GNR (GNR) heads, AMR heads are gradually becoming the mainstream application for magnetic encoders.

KCI encoder selection considerations

1) Standard form factors of absolute encoders: 38MM, 58MM, 66MM, 80MM.100MM.2) Absolute encoders are classified into: single-turn, multi-turn. 3) Bus encoders are classified by principle into: incremental absolute encoders, optical absolute encoders. 4) Bus encoder cable outlet types are classified into: side outlet, rear outlet. 5) Bus encoder shafts are classified into: 6MM, 8MM, 10MM, 12MM, 14MM, 25MM. 6) Bus encoders are classified into: shafted, blind hollow, through hollow. 7) Bus encoder protection ratings are classified into: IP54-68. 8) Bus encoder mounting methods are classified into: clamping flange, synchronous flange, clamping with synchronous flange, blind hollow (spring leaf, clamping), through hollow (spring leaf, key pin). 9) Absolute encoder accuracy is classified into: single-turn accuracy and multi-turn accuracy, which together constitute the total accuracy, i.e., the typical number of bits (standard 24 is, 25 is, 30 bits, 32 bits). 10) Absolute encoder communication protocol baud rate: 4800~115200 bit/s, default is 9600 bit/s. Refresh cycle approximately 1.5ms. Encoder output options: SSI, 4-20MA, profibus-dp, DEVicenet, parallel, binary code, BESM58, BiSS, ISI, CANopen, Endat, and Hiperface.

KCI encoder selection notes

1) Mechanical installation dimensions: including locating spigot, shaft diameter, mounting hole positions; cable exit method; installation space volume; whether the environmental protection rating meets requirements. 2) Resolution: i.e., the number of pulses output per revolution by the encoder during operation, and whether it meets the design accuracy requirements. 3) Electrical interface: Common encoder output methods include push-pull output (F type HTL format), voltage output (E), open collector (C, commonly C is NPN transistor output, C2 is PNP transistor output), and line driver output. The output method must match the interface circuit of its control system.

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