Stepper motors are inherently open-loop devices. They don’t require feedback because each pulse of current delivered by the drive equals one step of the motor (or a fraction of a step, in the case of microstepping). And with small step sizes, or step angles, the motor’s position can be determined very precisely without the need […]
What is Abbé error and how does it affect linear systems?
When evaluating the accuracy of a linear motion system, the area of focus is often the positioning accuracy and repeatability of the drive mechanism. But there are many factors that contribute to the accuracy (or inaccuracy) of a linear system, including linear errors, angular errors, and Abbé errors. Of these three types, Abbé errors are probably […]
Follow these four tips when using L10 life to size linear bearings
The well-known bearing life equation, often referred to as L10 life, is a fundamental element in the sizing and selection of recirculating linear bearings. Through statistical analysis and real-world testing, the L10 life equation can predict, with 90 percent reliability, the life that a recirculating bearing can be expected to achieve. But even this universally […]
What’s the difference between backlash and hysteresis in linear systems?
In linear systems, backlash and hysteresis are often referred to as the same phenomenon. But while they both contribute to lost motion, their causes and methods of operation are different. Backlash: The enemy of linear systems Backlash is caused by clearance, or play, between mating parts, which introduces a dead band when the direction of […]
Moving coil technology: Benefits today (and innovations on horizon)
Moving coils have been around for many years. Now though, market pressures are causing the technology to rapidly evolve and gain in use. This technology competes most directly against pneumatic drives and moving-magnet rotary motors. By Ed Neff • President | SMAC Moving Coil Actuators (MCA) Moving coil technology works in both rotary and linear […]
Moticont high-resolution electric cylinders include integrated encoder
SDLM-025-070-01-01 and SDLM-025-070-01-05 direct drive linear motors from Moticont, also known as electric cylinders, have built-in encoders, and feature high acceleration, high speed, high resolution, zero backlash, and zero cogging. These compact direct-drive linear motors with quiet linear plain bearings are just 1.00 in. (25.4 mm) in diameter and 2.75 in (69.9 mm) long. Protected […]
Parker Hannifin high-precision electromechanical solutions at Photonics West 2019
Parker’s Electromechanical and Drives Division will be exhibiting at SPIE Photonics West 2019 in San Francisco, February 5 to 7, 2019. Every year, more than 20,000 attendees come to the world’s largest photonics technologies event to learn about the latest research as well as find the latest devices and systems that use new technologies to […]
When did the most common linear-actuator options come about?
This is the first of several technical notes on the technology known as moving coil actuators. Here we provide a brief history of linear actuators used in automation — and hint at where moving coil actuators are suitable. By Ed Neff • President | SMAC Moving Coil Actuators (MCA) Hydraulic actuators came first. These devices […]
Enclosed PHD Plus Series ESU electric-belt-driven base slides
PHD Inc. now sells PHD Plus Series ESU electric-belt-driven base slides. The Series ESU Electric Belt-Driven Base Slides feature a robust, enclosed design with a high capacity rail bearing system delivering exceptional moment and load capability. Available in three sizes, with travels lengths up to 5,500 mm and speeds to 5,000 mm/s, these electric base […]
Official opening of SERAPID Group subsidiary SERAPID Singapore Pty. Ltd.
As part of its international growth strategy, SERAPID Group (a leading supplier of lifts, quick-die-change, and horizontal transfer systems) has opened a new regional office in Singapore. Mr. Robert Degenkolb, formerly of JR Clancy, is joining the organization as Managing Director. Robert has 32 years of experience in the entertainment industry in project management and […]
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