Lead-lag controls or compensators are pieces of programming in control systems that improve frequency response. A lead control can increase a system’s stability or its response speed. A lag control can reduce steady-state errors. Different combinations change output in different ways. A note on terminology: The terms controller and compensator have several different meanings. Some […]
Actuators
FAQ: What’s the difference between variable-reluctance linear and hybrid linear steppers?
Linear motors come in different mechanical and electromechanical arrangements to satisfy the requirements of different applications. For example, brushless linear motors (capable of forces to 2,600 N or more) work well in heavy robotics or material-handing applications. Linear ac-induction motors output 2,000 N to satisfy heavy-conveyor parameters. In contrast, iron-core brushless linear motors deliver a […]
FAQ: How do linear stepper motors compare to familiar rotary types?
Stepper motors go into linear actuators in two different ways: Stepper motors that are traditional rotary motors couple to mechanical rotary-to-linear motion devices (often in the form of a threaded shaft that mates with traversing nut or carriage) to produce linear motion. In this actuator setup, the motor output shaft usually couples to the screw […]
Electric (and roller-screw) cylinder outputs extremely high force
Now, Parker’s Electromechanical Automation Division sells a new XFC Series electric cylinder. It extends the performance range and (with the ETH product line) creates one of the most feature-rich and application-optimized liner-motion product lines available. The XFC has an integrated roller screw with planetary rollers instead of the ball bearings used in ball-screw actuators. Planetary rollers provide more contact between the […]
Spectral Decomposition for fast servo control from Delta Tau
Delta Tau now offers a new control method called Spectral Decomposition to improve the productivity of systems that use fast-tool actuators. Spectral Decomposition works with a variety of fast-tool actuators—including voice-coil motors, piezo crystals, laser galvanometers and magnetostrictive transducers. These actuators have high bandwidth, but limited travel. So they are typically paired with a standard […]
LiftWalker uses ball-scew actuator to help patients leave wheelchairs
The new LiftWalker from medical manufacturer Ideomotion is a stainless-steel frame with 12 V actuators that run off two rechargeable Nickel-Metal-Hydride batteries. Made in the U.S., the walker assists people from 3 ft 6 in. to 6 ft 6 in. tall and up to 300 lb with juvenile, preschool, and X large models. An easy-adjust […]
Integration: The key to staying successful in today’s growing automation market
by Michelle DiFrangia, Assistant Editor, @wtwh_michelle According to research by MarketsandMarkets, the global market for industry control and factory automation will grow at a CAGR of 8.53% through 2020—so that all industries combined will spend $301.9 billion on automation by 2020. In addition, many research organizations estimate that there will be about 50 billion devices […]
Electric actuators: More choices for more applications
Updated May 2015 by Lisa Eitel || Faster controls, easier integration, lower drive prices and the Ethernet have all helped electric actuators, also known as electric linear drives, move into new applications. “Except for better efficiency,” noted Ernst Blumer, director, Worldwide Sales & Marketing, LinMot, “the performance of electric actuators has not undergone big changes or […]
New LA25 compact linear actuator from LINAK
The LINAK TECHLINE LA25 compact linear actuator is reliable, even in extreme conditions. Thanks to an aluminum housing and other features, the actuator is rated to IP66 and IP69k. More specifically, the actuator is rated IP66 for outdoor use and withstands high-pressure washdown to IP69k. Integrated actuator controller Some versions include iFLEX integrated intelligent control and an integrated H bridge, […]
Leadscrews lead in 3D printing, manufacturing, and medical designs
Leadscrews are a staple of motion designs, driving axes on machines big and small. They usually sport higher ratings than comparable ballscrews thanks to more contact between the nut and screw load surfaces. Now, innovations in materials and helix geometry address old issues associated with leadscrew friction, bringing it down to better than 0.10 in […]