January 10, 2012 Volume 08 Issue 01

Motion Control News & Products

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Robot has longest reach in Mitsubishi's low-cost series

The MELFA RV-12CRL vertically articulated robot has the longest reach of any robot in Mitsubishi Electric's low-cost robot series: 1,504 mm (59.2 in.). With a 12-kg (26.4-lb) payload capacity, this unit is an ideal candidate for machine tending, case packing, and pick-and-place applications. Built-in features provide enhanced safety, streamlined implementation, and an overall reduction in downtime. Features internal cables and air hoses for end-of-arm tooling.
Learn more.


Servomotors for food, beverage, pharma, more

Siemens' new stainless steel SIMOTICS S-1FS2 line of servomotors has been designed for the clean condition requirements of the food, beverage, sterile packaging, pharma, and other process industries. These motors are highly resistant to corrosion and acidic chemicals and are offered in a variety of power ratings, from 0.45 to 2 kW (0.60 to 2.68 hp) with torque from 3.1 to 14 Nm (2.28 to 10.32 ft-lb). Features include high dynamics due to low inherent inertia, high overload capacity for pick-and-place, and precise movement of heavy loads. Easy installation and cleaning. Compatible with the SINAMICS S210 drive system.
Learn more.


What is Sensorless Closed Loop? Precise motor control without an encoder

Matt Sherman, eMobility Sales and Application Engineer at KEB America, runs through different options to drive an AC motor, including one called "Sensorless Closed Loop" that does not require additional hardware such as encoder, resolver, or cables on the motor.
Read this informative KEB America blog.


All about magnetic rotary encoder

The precision and reliability offered by modern rotary encoders are essential in many product categories. These include robotics, machine tools, printing presses, motion control systems, medical equipment, aerospace, gaming and entertainment, and automotive. Learn all about magnetic rotary encoders -- and important developments in the technology's future.
Read the full Avnet article.


High-force actuator line expanded with new models

Tolomatic has introduced five new products in its RSX line of high-force actuators to meet a wider range of industrial applications. These five sizes expand the RSX's capabilities to include forces up to 66,000 lbf (294 kN). RSX actuators, which feature high-precision planetary roller or ball screws for longer life in harsh environments, enable the easy replacement of traditional hydraulics to eliminate leaks and improve system performance.
Learn more.


What's a motion-amplified piezoelectric actuator -- and what can it do for you?

Piezoelectric motion components are highly valued for their fast response times, capable of dynamic movements at frequencies reaching several kHz, and delivering motion resolution down to the sub-nanometer level. Learn why amplified piezo actuators have the edge over traditional piezo stack actuators.
Read the full article.


How to maximize and optimize stepper motor control

Engineers from Performance Motion Devices take a comprehensive look at how to control two-phase stepper motors, beginning with the basics (operations, strengths and weaknesses) and moving on to traditional and updated advanced techniques for control including closed loop. A very thorough presentation.
Read this informative Performance Motion Devices article.


Ergoswiss table lifting systems from AutomationDirect

Automation-Direct has added the new SQ series table lifting systems from Ergoswiss. These lifting systems use electrically driven columns that allow the operator to reposition the height of a worktable, conveyor, etc. to meet specific requirements. In doing so, the operator can perform their tasks in a more comfortable working posture, helping to reduce work-related injuries. These systems are all electric (no hydraulic mess or manual hand cranks), and each lifting column features a housed motor and screw drive to perform the needed height adjustments.
Learn more.


Compact linear voice coil servo motor with built-in shaft and bearing

The GVCM-032-025-02M Linear Voice Coil Servo Motor is the first of a new series of non-commutated, brushless linear servo motors from Moticont. This clean and quiet unit has a 12.7-mm stroke with built-in shaft and bearing, a continuous high-force-to-size ratio of 9.3 N (2.1 lb), and 29.3 N (6.6 lb) of peak force at a 10% duty cycle. Features include: high reliability, high speed, zero cogging, high acceleration/deceleration, and, when used in a servo loop, very high accuracy and repeatability. An ideal choice for: haptic feedback, medical devices, laser machining and drilling, work holding and clamping, scanners, optical focusing, testing, sorting, and assembly.
Learn more.


Optical rotary encoders: Close the stepper motor linear actuator feedback loop

With the help of a motion controller and a stepper driver, all stepper motor linear actuators can be programmed to position a load to a precise location. However, standard configurations do not provide a feedback mechanism that tells the operator whether the move is completed or not. Adding an encoder can be an effective and simple solution to get real-time motion feedback about your application.
Read this informative Thomson article.


Overhead conveyor drives for automotive, food processing

Overhead conveyor drives from NORD DRIVE-SYSTEMS are engineered with long-lasting performance and durability in mind. They feature high-quality components, heavy-duty construction, and an output mounting flange and shaft for easy drop-in replacement of industry-standard footprints. They are an ideal solution for meat and poultry processing, automotive assembly, and other manufacturing systems where utilization of vertical space is required. Lots of options and many more features.
Learn more.


New micro motor controller elevates precision, speed, and torque management

maxon, a leader in DC motor and drive solutions, has unveiled its latest innovation: the ESCON 2 controller. This advanced speed and current controller, designed for micro motors, significantly enhances control precision. The ESCON 2, suitable for brushed and brushless DC motors up to 1,800 W continuous duty, is engineered for seamless OEM integration into customer systems. Enhanced control features include field-oriented control (FOC), acceleration, and velocity feed-forward capabilities. Supports 4-quadrant operation. Lots more features. Available from Electromate.
Learn more and get all the specs.


Next-gen motor for pump and fan applications

The next evolution of the award-winning Aircore EC motor from Infinitum is a high-efficiency system designed to power commercial and industrial applications such as HVAC fans, pumps, and data centers with less energy consumption, reduced emissions, and reduced waste. It features an integrated variable frequency drive and delivers upward of 93% system efficiency, as well as class-leading power and torque density in a low-footprint package that is 20% lighter than the previous version. Four sizes available.
Learn more.


Deep learning-based part detection for machine tending cobots: Universal Robots at IMTS

Universal Robots, the pioneer of collaborative robotics, is set to unveil a new AI-powered machine tending solution at IMTS, enabling faster batch changeovers by eliminating the need for fixtures. Additionally, the company will showcase advanced cobot applications for welding, finishing, part feeding, and laser marking. Lots of useful tech here.
Read the full article.


Why air bearings are used to test satellites

The number of active satellites in space keeps growing, with more than 10,000 active satellites orbiting our planet. Commercial and academic institutions developing these satellites continuously work on improved test systems and methodologies to fully validate their hardware before launch. Learn why PI's 3-DOF spherical air bearing systems are an important part of this process.
Read the full article.


Navy researchers fire 1,000th shot on laboratory electromagnetic railgun

By Grace Jean, Office of Naval Research

Scientists at the Naval Research Laboratory (NRL) hit a materials research milestone in the Office of Naval Research's (ONR) Electromagnetic Railgun program when they fired a laboratory-scale system for the 1,000th time Oct. 31.

"A significant amount of development has been coming out of NRL to support the program," said Roger Ellis, ONR's Electromagnetic Railgun (EMRG) program officer. "It's a key piece of making railgun successful."

The EMRG is a long-range weapon that launches projectiles using electricity instead of chemical propellants. Under development by the Department of the Navy (DON) for use aboard ships, the system will provide Sailors with multi-mission capability, allowing them to conduct precise naval surface fire support or land strikes; cruise missile and ballistic missile defense; and surface warfare to deter enemy vessels.

"The weapon does all its damage because of its speed," said Dr. Roger McGinnis, program executive for ONR's Naval Air Warfare and Weapons Department, which oversees EMRG. Launched at 2 to 2.5 km per sec (4,500 to 5,600 mph) without using explosives, the projectile reaches its target at speeds that require only a small charge similar to that found in automobile airbags to dispense its payload, eliminating the objective through the inherent kinetic energy.

"EMRG will provide the Department of Defense with an advantage in future conflicts by giving troops the ability to fire weapons inexpensively against targets," McGinnis said.

As part of the EMRG development program, ONR and NRL co-funded scientists at NRL to build and operate a 6-m long, 50-mm-diameter railgun as a subscale experimental lab at the Materials Testing Facility (MTF). Researchers fired the first shot in March 2007. After improving the gun's sliding armature and rails, the lab has fired an average of 300 shots per year since 2008.

A railgun launches projectiles by generating magnetic fields created by high electrical currents that accelerate a sliding metal conductor, or armature, between two rails.

"The 1,000th shot is testing new ideas of how the armature interacts with the rails," said Dr. Robert Meger, head of NRL's charged particle physics branch, which conducts about 30 experiments annually on the railgun. Following each test firing, researchers dismantle the gun to examine all the components. They slice up the rails for further analysis under a microscope to reveal surface damage.

During the course of firing all 1,000 shots, NRL scientists have experimented with a variety of materials and geometries to determine which ones can withstand the metal-melting temperatures and pressures of shooting a 1.5-megajoule energy weapon. One megajoule of energy is equivalent to a 1-ton car traveling at 100 mph.

"We've really explored a lot of territory," ONR's Ellis said. "When you couple what we're seeing in testing with what we're seeing in modeling and simulation, it results in some interesting barrel shapes that you wouldn't intuitively think about. Railgun barrels don't necessarily have to be round as in most conventional gun designs."

Since 2005, scientists have been working to increase the railgun's barrel life, muzzle energy, and size. Ultimately, their work will help to produce a 64-megajoule railgun with a range of about 220 nautical miles.

"You really have to look at the course of our understanding from the first day they shot to the 1,000th shot today, and how much our understanding of the rail life has dramatically increased, and how much science we have applied to ensure that we're on the path toward a future fieldable system," Ellis said.

Materials science breakthroughs resulting from the test firings have given researchers confidence to transition new technologies to a scaled-up experimental launcher at Naval Surface Warfare Center Dahlgren, VA, which fired a world-record-setting 33-megajoule shot in December 2010.

Published November 2011

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