Electromechanical Test Actuators
These actuators are available as standard designs up to 100 kN or as custom designs up to 1000 kN. The ball screw design is recommended for applications with considerable larger stroke during testing. It is recommended, that the test-stroke shall be more than the ball-diameter of the screw for fatigue testing.
The Roller Screw Actuators deliver heavy load capacity, high speed capabilities and exceptionally long life when compared to other linear actuator technologies. This Series of force tube actuators use a planetary roller screw mounted inside a telescoping tube mechanism. The Roller-Screw design delivery up to 15 times the work life of other comparably sized screw actuator products on the market - specifically ball screw and acme screw actuators - have relatively low load capacities, short working lives and limited speed capabilities.
The bearing and roller screw components are mounted within the sealed housing. This prevents abrasive particles and other contaminants from entering the actuator’s critical mechanism and assures trouble-free operation even in the most severe environments.
For the inline version, the entire drive train (rollerscrew or ballscrew, gearbox and motor) is in one axis. The torque does not have to be transmitted via toothed belts and toothed belt pulleys.
The connections of the individual drive components can be made backlash-free.
If the actuator integration in a test system allows it, the inline version is technically preferable.
Parallel drive mounting
Test cylinders for component testing many times have a parallel mounting of the gearbox and motor in order a joint can be added also on the actuator base (foot flange). The joints are used to avoid misalignment and elimination side load and moment which could invalid your test or damage the actuator or its components.
Electromechanical Actuators in combination
with PCS8000 digital controller For the electromechanical Test Actuators the PCS8000 digital controller is available with integrated servo (internal power amplifier) drive for maintenance-free AC
synchronous motors. It supports drives in the power range from 200 W to 1.4 kW with resolver and a thermal winding protection (PTC). The power amplifier module can be added into the housing of the PCS8000 controller. It is fully integrated into the existing control structure. Apart from the servomotor, no external components are required.
The servo controller is controlled by a 32-bit microcontroller, which communicates with the PCS8000. The close-loop-control rate is 8000 Hz (8 kHz) and the data-acquisition rate is available up to 14400 Hz (14.4 kHz). The number of pole pairs of the motor, the maximum current, as well as other motor and controller parameters are configured via PCS8000. The temperature of the amplifier is constantly monitored as a protective function. The internal power amplifier module is also woven into the safety concept of the PCS8000: The power module is electrically isolated, via emergency button the engine is switched off. To suppress circuit feedbacks the servo amplifier is equipped with a PFC (Power Factor Corrector).
