Linear Actuators For Nanopositioning Applications

Physik Instrumente (PI) from Karlsruhe has launched the N-216 series of Nexline drives - a range of high-load linear actuators for nanopositioning applications. The actuators combine travel ranges of 20mm, pull or push forces of up to 600N and positioning accuracies in the nanometre range, the company said. The products are suitable for open-loop and closed-loop operation. The integrated encoder of the versions that can be operated in closed-loop mode has a resolution of 5nm over the total travel range.

In open-loop mode - for example, for highly dynamic applications - position resolutions of up to 30 picometres are achieved. In order to make the best possible adjustment of the drives to the relevant application, two different controllers are available. The E-755 offers all functions for a positioning with nanometre accuracy and therefore covers most applications well. The E-712 controller system additionally has improved linearisation algorithms for extremely steady motion and allows faster feed-forward motions with maximum force.

The Nexline drives produce the feed forward using a combination of longitudinal and shearing piezos, in other words, piezo actuators with different motion characteristics. If they are driven appropriately, clamping as well as driving motions can be realised that resemble the motion of a quadruped. The load can therefore be moved with constant speed over the total distance. In this way, the position can be actively re-adjusted after the target position is reached. This can be used to compensate vibrations. Since the drives have no moving parts, there is no mechanical play and no wear.

Comments

Post a Comment

Popular posts from this blog

What is Class I Division 2?

Image
A Class I Division 2 is a location: (1) In which volatile flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are handled, processed, or used, but in which the liquids, vapors, or gases will normally be confined within closed containers or closed systems from which they can escape only in case of accidental rupture or breakdown of such containers or systems or in case of abnormal operation of equipment, or (2) In which ignitable concentrations of flammable gases, flammable liquid-produced vapors, or combustible liquid-produced vapors are normally prevented by positive mechanical ventilation, and which might become hazardous through failure or abnormal operation of the ventilating equipment. Class I Division 2 Classification Class I Division 2 refers to the ANSI/ISA 12.12.01 standard. This standard was previously UL1604 until UL recommended the newer ANSI/ISA standard be used and that all hazardous location products be certified under this standa
Read more

FUSE SIZING CONSIDERATIONS FOR HIGHER EFFICIENCY MOTORS

Image
When selecting the proper fuse for short circuit protection in motor starting applications, it is important to not only ensure that the fuse will not nuisance open during motor start up times, but also that the fuse will coordinate as required with overload relays. When sizing fuses between 125% and 150% of the motor nameplate current, several advantages, including ease of coordination with an overload device, a smaller disconnect, and increased short circuit protection from a lower fuse rating, can be achieved. However, if sizing at this level prevents the motor from starting, it may then be necessary to increase the fuse ampere rating and it then becomes important to know the NEC sizing limitations. As of June 1, 2016, the US Department of Energy has mandated that newly manufactured electric motors will need to meet NEMA Premium® efficiency standards. As motor efficiencies increase, motor locked rotor currents can also be expected to increase. In addition to this, with across-the-lin
Read more

7/8 16UN Connectors that Provide 600 Volts and 15 Amps

TURCK announces new A-Size 3 and 4-pin 7/8 16UN powerfast™ connectors that provide up to 600 Volts and 15 Amps of power. These IP67 rated connectors provide a modular wiring system designed to handle high current applications for machine power distribution, while providing resistance to vibration commonly associated with conveyors, motors and material handling applications. The cordsets are available with a tray rated, exposed run PVC flexlife ® cable, with or without STOOW rating, and 14 AWG wires that allow you to replace hard wiring with a robust, quick disconnect system that saves the time and money spent installing a conduit system. The A-Size powerfast line offers male and female, straight connectors, standard and custom lengths, and pigtails or extensions. To make the system complete, fully encapsulated mating receptacles, with 1/2”-14 NPT mounting threads are available.
Read more