Why emphasis on absolute encoder "absolute" definition ！

Why the emphasis on absolute encoder "absolute" definition

First, it can provide an absolute position code value for each axis. Especially in the position control, absolute encoder without counting, can direct internal high-speed readout and an external output, this "high speed" and "economy" is characterized by absolute encoder, which can reduce the subsequently received device control the computing tasks, and reduce the cost of other additional input member. For example, in multi-axis industrial robot working in parallel, you can achieve high-speed parallel multi-axis synchronization. As well as the needs of multi-axis synchronization control.

Second, do not need to count the absolute encoder after power-up or internal and external power failure, without reference to the drive, the normal power supply is available after the current exact location. And the next (for example, the inverter and the motor interference) complex in a variety of industrial electrical interference environment case, since the absolute encoder to its original location information is absolute and not subject to interference. The above characteristics, determine the safety and reliability features of this encoder can be used with safety requirements of the occasion, such as wind turbine pitch systems, synchronous port machinery positioning, lifting machinery, construction machinery (cranes), elevator, engineering large industrial robot, iron and steel metallurgy, petrochemical, water power, medical equipment, radar gun rotary device, rotating the solar tracking devices, as well as heavy industry, nuclear industry, automobile manufacturing and other fields.

Third, today, fast and reliable digital data transmission has been one of the core elements of an absolute encoder, industrial standard Canopen, Profibus-DP fieldbus, Profinet, Eerthnet Industrial Ethernet, Endat2.2, Hiperface , Biss, dedicated high-speed RS485 containing CRC data security and other servo robot dedicated high-speed data transfer protocol, the original "pulse" send information incremental encoders can not be achieved. This is a high-speed bus absolute encoder type features.

Fourth, high-resolution absolute encoders feature number, eliminating the need for internal and external counter directly output digital signals, so no longer read "Pulse" and "accumulate" and the response at high speed can not keep up confused, mixed analog and advanced digital technology, the absolute encoder has been able to achieve a high number of resolutions, such as Germany absolute encoder lap 25 (25 to the power split 360 degrees 2), this high resolution can be satisfied with the robot servo motor speed and precise positioning of the smallest pitches jitter. For example, in accurate calculation of acceleration, jerk high-ranking position derivative (rigid movement), the smallest tip of the robot arm shaking accurate positioning.

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