Absolute encoders, because each position is absolutely unique, anti-interference, and does not require power-off memory, have been increasingly used in angle, length measurement and positioning control in the robotics and automation industries. The uniqueness of each position of the absolute encoder is determined by the mechanical position. It does not need to remember, does not need to find a reference point, is not affected by power outages and interference, and does not need to keep counting. Whenever you need to know the position, you can read it. its location.
There are two types of absolute encoders: single-turn and multi-turn.
A single-turn absolute encoder is a device used to measure the angle of rotation. It can accurately determine the angular position of a rotating object relative to a reference point. The encoder has just a rotating disc with a series of coding grids engraved on it. As the object rotates, the encoded grid on the rotating disk interacts with the sensor to measure the absolute position of the rotation. This type of encoder can only measure angles within one revolution, and once it exceeds one revolution, it cannot provide an accurate absolute position.
Multiturn absolute encoders have higher resolution and measuring range. It consists of multiple rotating discs, each with a coding grid. The design of these encoded grids allows them to measure the absolute position of rotation relatively independently, providing a wider angular measurement range. Multiturn absolute encoders can typically measure multiple turns of rotation and provide greater accuracy and resolution. They are suitable for applications that require measurement of multiple rotations, such as robotic arms, aerospace, etc.
Advantages of single-turn absolute encoders:
1. Simple structure and low cost.
2. Suitable for applications that only need to measure rotation angles within a small range.
3. For measurements within one circle, it has high resolution and accuracy.
Disadvantages of single-turn absolute encoders:
1. It is impossible to directly measure the rotation angle of more than one turn.
2. Unable to provide accurate absolute position information after more than one rotation.
Advantages of multiturn absolute encoders:
1. Can measure more than one rotation angle, with a wider measurement range.
2. Provide higher resolution and accuracy.
3. Suitable for applications that require measuring a wide range of rotation angles.
Disadvantages of multiturn absolute encoders:
1. The structure is relatively complex and the cost is high.
2. More sensors and encoding grids are required, increasing the complexity of design and maintenance.
3. For rotation angle measurement within a small range, there may be an excess measurement range, resulting in a loss of data accuracy.
The choice between a single-turn absolute encoder or a multi-turn absolute encoder depends on the specific application requirements. If you only need to measure a small range of rotational angles and have low cost and complexity requirements, a single-turn absolute encoder is a good choice. It has a simple structure, low cost, and high resolution and accuracy within a measurement range within one circle. This kind of encoder is suitable for applications such as motor position control, robot arm motion control, etc. that require the measurement of small range rotation angles. However, if the angle of rotation needs to be measured over more than one turn, or if higher accuracy and resolution are required, then a multi-turn absolute encoder may be more suitable. Multi-turn absolute encoders can measure rotational angles over more than one turn, providing a wider measurement range with higher accuracy and resolution. This type of encoder is suitable for applications that require measurement of a wide range of rotation angles, such as turntable position measurement and ship steering wheel control.
Shenzhen Zhongling Technology, as a research and development enterprise that has long been focusing on products, has recently launched the latest absolute encoder hub motor to bring customers more comprehensive and high-quality products and solutions and promote the progress of the industry.
Post time: Sep-26-2023