Precision Linear Actuators

Classical motorized captive linear actuators with servo and stepper motors are typically combinations of a rotation-type motor and a screw-type actuator.

Lead-screws provide high forces and self locking capabilities, while ball screws are used for higher speed applications with longer service life. Position feedback is available with linear encoders and motor shaft mounted rotary encoders.

Smaller motors are often equipped with gear heads to provide higher torque and resolution, however at the cost of speed.

Actuators with built-in anti-rotation (non rotating tip) are easier to integrate and when used as pushers, do not generate torque or wear at the contact surface.

Recirculating ball screws (RBS) provide lower friction and higher velocity than lead screws by replacing sliding friction with rolling friction. Lower friction also means less heat generation when operated at high duty cycles and high velocities. On the other hand, reduced friction also means lower holding forces when powered off.

Actuators with built-in anti-rotation (non rotating tip) are easier to integrate and when used as pushers, do not generate torque or wear at the contact surface.

These voice coil actuators uses frictionless bearings – either flexures for short travel, or air bearings for extremely straight guiding. Both drive and guiding systems are wear free and clean room compatible.

Piezo stack actuators provide high forces, high stiffness, and very fast response in the sub-millisecond range, with displacement typically in the 100µm range.

Applications: Biotechnology, nano-dispensing, microfluidics, valve control, fast switching and nanopositioning, optics, medical-devices, life-sciences