Force/position control by digital servoactuators (Nov 2010)
New digital servoactuators from Atos are an effective electrohydraulics solution for easier subsystems configuration. They are smart actuators integrating many functions in a single, compact and programmable motion control unit:
- low friction servocylinder, with integral position and force transducers: to allows accurate movements with no stick-slip phenomena coupled and with high translation speeds
- high performance servoproportional valve equipped with on-board electronics: to ensure best hydraulic regulation and fail safe features
- integral digital driver and axis controller: just designed for electrohydraulics motion control, to improve performances thanks to new specifically developed algorithms
Digital servoactuators introduce a new automation architecture based on distributed intelligence and fieldbus interfacing for direct integration into existing communication networks: CANopen or PROFIBUS-DP.
They are independent units with 2 basic operational modes:
• slave control: precisely performs in real-time the motion closed loop control, according to external analog or fieldbus position reference signals
• motion cycle control: carries out a pre-programmed position/time motion cycle with closed loop control. The machine’s electronic unit has just to provide digital commands (start/stop/switch-over) to synchronise the servoactuator to the overall machine working cycle.
A position/force function is now available thanks to the development of new algorithms combining force and position controls.
In this enhanced configuration a single device can manage both the dynamic motion and the force control phases of any electrohydraulic axis. The axis controller automatically defines which control is active time by time, according to the position, pressure or load cell transducers’ feedback.
Atos original software, featuring intuitive and powerful graphic interface, allows to easily set and program the servoactuators in order to obtain best performances, improved diagnostics and customised motion profiles according to specific applications requirements.
www.atos.com
Photo caption: Motion profile example.
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