German motrona encoder motrona model motrona price

motrona encoders are a type of digital sensor, belonging to the category of code disk encoders. Code disk encoders are also known as absolute encoders; they convert angles into digital codes and can be easily connected to digital systems (such as microcomputers). Contact encoders consist of a code disk and brushes. The code disk uses printed circuit board manufacturing processes to create a disk-shaped PCB with a specific code pattern on a copper-clad laminate. A brush is a movable contact structure; under external force, when the code disk rotates, the contact between the brush and the code disk generates a digital code output in a specific format.

motrona encoder operating principle

A magnetic encoder consists of an optical code disk with a central shaft, featuring concentric transparent and opaque lines. Photodiode emitters and receivers read these lines to obtain four sets of sine wave 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 on the A and B phases enhances signal stability. Additionally, one Z phase pulse is output per revolution to represent the zero reference position. Since the A and B phases differ by 90 degrees, the direction of rotation (forward or reverse) of the magnetic encoder can be determined by comparing which phase leads. The zero reference position is obtained via the zero pulse. Code disk materials for magnetic encoders include glass, metal, and plastic. Glass code disks have very thin lines deposited on glass, offering good thermal stability and high precision. Metal code disks use direct etching for transparent and opaque lines, but due to the thickness of the metal, precision is limited, and thermal stability is an order of magnitude worse than that of glass. Plastic code disks are an economical option. The principle of magneto-electric encoders is similar to that of optical encoders, but they use magnetic field signals. Inside a magnetic encoder, a magnetic rotor and magnetoresistive sensors are used. Rotation of the magnetic rotor causes changes in the internal magnetic field strength. The magnetoresistive sensors detect these changes, and after signal processing by the circuitry, the signal is output. The number of magnetic poles on the magnetic rotor, the number of magnetoresistive sensors, and the signal processing method determine the resolution of the magnetic encoder. The advantage of using magnetic field principles for signal generation is that magnetic signals are not affected by dust, moisture, high temperatures, or vibration.

motrona encoder features

When the encoder shaft rotates, corresponding pulses are output. The determination of rotation direction and the increment/decrement of pulse count are achieved through the subsequent direction-detection circuit and counter. The counting start point can be set arbitrarily, allowing for multi-turn infinite accumulation and measurement. The Z signal, which outputs one pulse per revolution, can serve as the mechanical zero reference. One revolution of the encoder shaft outputs a fixed number of pulses, determined by the number of lines on the encoder grating. To increase resolution, the original pulse count can be multiplied using the A and B signals, which have a 90 degree phase difference, or a higher-resolution encoder can be used.

motrona encoder signal output

Signal outputs include sine waves (current or voltage), square waves (TTL, HTL), open collector (PNP, NPN), and push-pull types. Among these, TTL refers to long-line differential drive (symmetrical A, A-; B, B-; Z, Z-). HTL is also known as push-pull output. The interface of the signal receiving device must match the encoder. Signal connection: Encoder pulse signals are generally connected to counters, PLC, and computers. Modules connecting PLC and computers are categorized into low-speed and high-speed modules, with varying switching frequencies. Single-phase connection is used for unidirectional counting and speed measurement. A.B two-phase connection is used for bidirectional counting, direction detection, and speed measurement. Three-phase connection of A, B, and Z is used for position measurement with reference position correction. Connection of A, A-, B, B-, Z, and Z- involves symmetrical negative signals. This configuration results in an electromagnetic field contribution from the current to the cable of 0, minimizing attenuation and providing optimal noise immunity, allowing for longer transmission distances. For TTL encoders with symmetrical negative signal output, the signal transmission distance can reach 150 meters. For HTL encoders with symmetrical negative signal output, the signal transmission distance can reach 300 meters.

Weidou Intelligent Technology specializes in selling German motrona rotary encoders, motrona incremental encoders, motrona absolute encoders, motrona optical encoders, motrona magneto-electric encoders, motrona shafted encoders, motrona hollow shaft encoders, motrona contact brush encoders, motrona angle encoders, motrona linear encoders, motrona digital encoders, motrona draw-wire encoders, motrona position encoders, motrona hollow bore encoders, and motrona spindle encoders. All motrona products are original imports from Germany. Customers are welcome to inquire and place orders.