What is Conductive encoders?
Each spark = position pulse.
Hi everyone,
Conductive encoders are devices that measure position using a rotating disk with conductive and non-conductive segments and a sensor that detects the movement of these segments. As the disk rotates, the sensor makes contact with the conductive segments, creating an electrical signal. This signal is then processed to determine the position or movement of the rotating element.
Conductive encoders are suitable for high-precision applications, as they can provide accurate position measurements. However, they can be susceptible to noise and electromagnetic interference, which may affect their performance in certain environments. These encoders are often used in applications where precision is more important than resistance to harsh conditions.
Main advantage of conductive encoders is their ability to deliver absolute position feedback instantly and reliably due to their direct-contact construction. In systems where zero position loss is crucial (robot axes, precision positioning equipment, special machinery), they are a preferred solution.
Because mechanical contact is required, the contact surfaces may accumulate oxidation, wear, dust, or oil over time. This means regular cleaning and maintenance is necessary—compared to contactless optical encoders, maintenance intervals are shorter, but the measurement accuracy is often higher.
Electromagnetic interference (EMI) is the weak point of these devices. If used near strong inverters, drives, or welding equipment, proper grounding and shielded cables are essential. Running the encoder cable separately and using a filter can greatly improve signal stability.
The most common field mistake: Neglecting the maintenance of conductive encoders leads to position errors and incorrect machine operation. If you notice short circuits or faulty signals, always check for dirt or poor contacts first. Sometimes the simplest solution is just a contact cleaner and fine sandpaper.
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