German Gessmann encoder, Gessmann model, Gessmann price

Gessmann encoders belong to the detection and transmission stage in closed-loop control. They are used to detect the rotor magnetic field position of servo motors, providing accurate motor speed and position signals. The magnetic encoder then outputs signals to the drive for analysis, comparison, and logical judgment, ultimately driving the servo motor. In essence, a magnetic encoder is a sensor that continuously provides accurate signals to the drive to facilitate precise analysis and judgment.

Gessmann encoder accuracy

(1) utilizes code disks with 8421 coding. Although relatively simple, there are strict requirements for the manufacturing and installation of the code disk; otherwise, erroneous codes may occur. When the brush transitions from binary code 0111 to 1000, the value should change from 7 to 8. However, if the brushes do not enter the conductive areas in a consistent sequence, any decimal number between 8 and 15 may appear. This results in the aforementioned non-single-value error. One method to resolve this issue is to use a cyclic code disk. Due to the characteristics of cyclic codes, even if manufacturing and installation are inaccurate, the maximum error will be only one bit in the least significant position. Therefore, using a cyclic code disk offers higher accuracy than using an 8421 code disk. (2) Scanning method. There are three types of scanning: V scanning, U scanning, and M scanning. A brush is installed on the least significant bit track, while two brushes are installed on each of the other bit tracks: one brush is positioned ahead of the measured position, called the leading brush, and the other is placed behind the measured position, called the lagging brush. If the incremental width of the effective bit on the least significant bit track is z, the corresponding distances for the brushes on each bit are sequentially 1x, 2x, 4x, 8x, etc. Thus, at each defined position, the output level of the least significant bit brush reflects its true value. Since there are two brushes for higher bits, two levels are output. Based on the brush distribution and encoding change rules, to read the level value corresponding to the high-order binary code reflecting that position: when the brush on the lower-level track truly outputs "1", the true output on the higher-level track must be read from the lagging brush; if the brush on the lower-level track truly outputs "0", the true output on the higher-level track must be read from the leading brush. Since there is only one brush on the least significant bit track, its output represents the true position. This method is the V scanning method.

Gessmann encoder advantages and disadvantages

(1) Advantages: High precision, high resolution, high reliability, capable of directly outputting digital codes in a specific format, easy connection to microcomputers and digital systems, highly flexible and convenient to use, primarily used for measuring various displacement quantities. (2) Disadvantages: The resolution of (1) contact encoders is limited by the brushes and cannot be very high; (2) contact generates friction, resulting in a shorter service life; (3) contact does not allow for high-speed operation. Therefore, this type of encoder is less commonly used.

Gessmann encoder selection considerations

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, common C is NPN transistor output, C2 is PNP transistor output), and long-line driver output. The output method should match the interface circuit of its control system.

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