Germany B-COMMAND encoder B-COMMAND model B-COMMAND price

B-COMMAND encoder is a new type of angle or displacement measurement device. Its principle is to use magnetoresistive elements to measure the angle or displacement value of changing magnetic materials. Changes in the angle or displacement of the magnetic material cause changes in resistance or voltage. After processing by a microcontroller, pulse signals or analog signals are output to achieve measurement. Concentric code tracks start from the center of the magnetic encoder code disk and expand outward to the outside of the disk. Each layer of code track has twice as many partitions as its inner layer. The first layer has only one transparent sector and one opaque sector; the second layer located at the center has two transparent sectors and two opaque sectors; while the third layer of code track has four transparent sectors and four opaque sectors each. The built-in sensor head is small in size, suitable for small installation spaces, and adopts a high protection level design, making it usable in harsh environments. In industrial applications, it avoids the sensitivity to environmental pollution common in optical encoders, increasing long-term system stability.

B-COMMAND encoder working principle

The magnetic encoder consists of an optical code disk with a central shaft, featuring concentric light and dark tracks. Photodiode emitters and receivers read these tracks to generate four sinusoidal signals combined into A, B, C, and D. Each sine wave has a phase difference of 90 degrees. Inverting the C and D signals and superimposing them onto the A and B phases enhances signal stability. Additionally, one Z phase pulse is output per revolution to indicate the zero reference position. Since the A and B phases differ by 90 degrees, comparing which phase leads allows determination of forward or reverse rotation of the magnetic encoder. The zero reference position is obtained via the zero pulse. Code disk materials include glass, metal, and plastic. Glass disks have thin etched lines deposited on glass, offering good thermal stability and high precision. Metal disks use direct conductive/non-conductive lines; however, their thickness limits precision, and thermal stability is an order of magnitude worse than glass. Plastic disks are economical. The principle of magneto-optical encoders resembles that of optical encoders but uses magnetic field signals. Inside the magnetic encoder, a magnetic rotor and magnetoresistive sensors are employed. Rotation of the magnetic rotor causes changes in internal magnetic field strength. The magnetoresistive sensor detects these changes, and subsequent circuit signal processing outputs the signal. The number of magnetic poles on the rotor, the quantity of magnetoresistive sensors, and the signal processing method determine the resolution of the magnetic encoder. Advantages of using magnetic field principles include immunity to dust, moisture, high temperatures, and vibration.

B-COMMAND encoder application areas

Compared with traditional photoelectric and grating encoders, magneto-electric encoders offer better resistance to vibration, corrosion, pollution, interference, and wider temperature ranges, making them suitable for fields where traditional photoelectric encoders cannot adapt. Magnetic encoders are specifically designed for extremely harsh environments, which generally require wide temperature characteristics, resistance to strong vibration and shock, and high protection levels. In addition, we have reliable signal output circuits and simple installation methods, which can greatly reduce losses from downtime. They are typically used in metallurgy, papermaking, and woodworking machinery. High-performance magnetic encoders are widely used in industrial control, mechanical manufacturing, ships, textiles, printing, aviation, aerospace, radar, communications, military industry, and other fields.

B-COMMAND encoder features

1) After power startup or internal/external power faults, the encoder does not require reference driving and can obtain the current accurate position once power is normal. Under interference from various harsh environments, the raw position test data of the hollow shaft encoder 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, enabling direct internal high-speed reading and external output. Secondly, the subsequent calculation tasks of the hollow shaft encoder in the receiving equipment controller can reduce the cost of other additional input components. For example, hollow shaft encoders in multi-axis parallel working 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 the high-resolution characteristics, general hollow shaft encoders do not require internal and external counting but directly output digital signals, so they are no longer affected by reading pulses and accumulation. They can respond at high speeds. For some high-efficiency equipment, hollow shaft encoders can also achieve high-resolution. 4) The encoder is a very flexible type, characterized mainly by compactness and convenient adjustment. Position can usually be flexibly adjusted via spring plates. Hollow shaft encoders can determine the rotation direction through the A phase pulse signal and the B phase output time, thereby mastering the pulse signal values. Currently, hollow shaft encoders are generally adapted for use in multiple application scenarios. 5) The clamping method and spring plate structure of this shaft encoder allow for very convenient position adjustment and absorption of load vibration and shock. Moreover, the hollow shaft encoder outputs based on the rotational displacement of the shaft during operation. Combined with the shaft via a coupler, it can directly detect rotational displacement. Usually, no origin reset is required at startup. Under normal conditions, the rotation angle can be output in parallel as an absolute value.

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