Motion Control & Drives


ML compensates for ‘cogging’ in high-precision linear motion

June 2022 Motion Control & Drives

The highly dynamic AL8000 linear servo motors from Beckhoff now meet even higher requirements for accuracy and synchronisation with the new TwinCAT Cogging Compensation software (Engineering TE5920, Runtime TF5920). This makes the linear motors particularly suitable for high-precision applications such as milling or laser cutting machines. The cogging compensation software makes use of machine learning (ML) which is seamlessly integrated into TwinCAT and applied on a fully automated basis.

Cogging forces in linear motors are caused by the magnetic attraction between the iron core in the primary part and the permanent magnets in the secondary part. This physical effect leads to an unwanted and uneven ‘cogging’ of the motor, meaning that applications with extremely strict accuracy and synchronisation requirements can only be executed to a limited extent. This is where the AL8000 linear motors, in combination with the TwinCAT Cogging Compensation software, offer an optimal solution: the cogging forces are reliably compensated for with the help of this software, which takes not only magnetic effects into account, but also those of the mechanical design or energy chains. As a result, the range of possible applications for the AL8000 iron-core linear motors is significantly expanded.

Cogging compensation is based on the fully automated application of machine learning in TwinCAT. The software independently records the necessary cogging data in the respective customer application as part of a reference run over the entire length of the linear motor’s magnetic track. With the help of the data acquired in this way, the software trains a neural network which is ultimately integrated into the control system for current pre-control. By adapting the current pre-control in this way, the lag error can be reduced by up to a factor of 7 and the synchronisation of the machine increased by up to a factor of 5 without any hardware changes to the AL8000.

For more information contact Dane Potter, Beckhoff Automation, +27 79 493 2288, danep@beckhoff.com, www.beckhoff.co.za


Credit(s)



Share this article:
Share via emailShare via LinkedInPrint this page

Further reading:

Motor starter with integrated isolation contactor
Vepac Electronics Motion Control & Drives
Owing to its integrated functions and protection circuits, classic motor protection is not required – the installation requires only the line fuses to protect the wires.

Read more...
Improved bearing block units for higher efficiency
Bearing Man Group t/a BMG Motion Control & Drives
BMG’s range of BTC bearings and components – which is manufactured exclusively for BMG to stringent quality and safety specifications – has been extended to include new bearing block units.

Read more...
Electric cylinders eliminate compressed air requirements in production plants
Beckhoff Automation Motion Control & Drives
Beckhoff Automation’s AA3000 Series represents an efficient servomotor alternative to energy-intensive pneumatic cylinders.

Read more...
Driving African mining solutions
SEW-Eurodrive Motion Control & Drives
SEW offers customised solutions for the African mining industry and lead time advantages thanks to its new multimillion local assembly facility in Johannesburg.

Read more...
Integrated bearing assemblies for tough applications
Bearing Man Group t/a BMG Motion Control & Drives
These NSK parts are designed especially for vibratory screen machines, which are used in arduous construction, agriculture, quarrying and mining applications.

Read more...
Proud milestone for Bearings International
Bearings International Motion Control & Drives
“We are definitely one of the longest-serving Cooper distributors in the world. It is a fantastic achievement, especially as it remains one of our top-selling brands.”

Read more...
Sliding from Munich to Cairo on durable igus linear carriage
RS Components SA Motion Control & Drives
With the T20 of the drylin W series, igus has launched a new linear carriage which has the same dimensions as most classic carriages with recirculating ball bearing guides.

Read more...
Optimised, PC-based food production
Beckhoff Automation Editor's Choice System Integration & Control Systems Design
Foodjet’s MDL food printers can portion and deposit toppings with maximum precision, whether coating pizza dough with a perfect layer of tomato sauce, or icing doughnuts with seasonal decorations.

Read more...
XTS transport system with innovative ‘No Cable Technology’
Beckhoff Automation Motion Control & Drives
Contactless power supply and synchronous real-time data communication enable XTS movers to be expanded into mobile handling and processing stations.

Read more...
Power supplies with EtherCAT interface
Beckhoff Automation Electrical Power & Protection
In the case of system monitoring, important operating parameters such as output current and voltage are transmitted in real time and updated continuously

Read more...