Encoders read positions of the component to which they are attached and convert them into signals. Rotary devices do this for rotating elements, whereas the linear type is utilized with machine constituent moving along a straight line. In any case, the measuring instruments play the role of a mediator linking the mechanical parts of a mechanism with a controller or another monitoring and control unit.
In robotics, an absolute encoder is one of the most efficient transducers for communicating position data within a motion system. What makes the device stand out?
There are two basic measurement types employed for the encoding process—absolute and incremental. A measurement system determines the method of acquiring data in a transducer. More specifically, it is the coded disc or scale type and the way those are scanned.
Why absolute encoder is much in demand
allows determining angular displacements with pinpoint accuracy
retains position data despite power disruptions
enables improving speed control by enabling faster motion response
has multiple interface options, such as BiSS, Profibus, CANOpen, etc.
has high resolution
An incremental encoder defines relative positions— differences between two points in a rotation trajectory—and requires a reference point to be set.
The magnetic encoder comprises a sensor, a coded disk with magnetized strips, and a conditioning circuit. The purpose of the sensor is to detect a change in voltage or magnetic field and convert the data into a signal. The conditioning circuit processes the sensor signals to generate the desired encoder output—absolute or incremental positions.
When do you need absolute position encoder
If your application needs position data immediately at equipment startup
To avoid machinery damage or staff injuries by making motion control more efficient
To reduce wear caused by dust and electrical noise
If your application requires real-time positioning and has sophisticated digital control
In Rozum Robotics servo motors, the absolute position encoder reads motor shaft positions. As part of the solution, it is used multiple applications of intricate design delivering the following benefits:
• excellent reliability
• 19-bit resolution
• resistant to impurities, heat, shock, and vibration
• magnetic operating principle
• compact and robust
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