November 06, 2012 Volume 08 Issue 41

Motion Control News & Products

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Monitoring ring combines shaft grounding and shaft current tracking for motors in critical applications

Electro Static Technology's new AEGIS iPRO-MR Ring combines shaft voltage bearing protection with continuous monitoring of shaft voltage levels from a remote location -- all in real time. The AEGIS iPRO-MR is an AEGIS Shaft Grounding Ring and a shaft monitoring ring in one, ensuring optimum uptime and reliability of large motors and generators in critical applications. The iPRO-MR is ideal for the protection of motors in remote locations that cannot be easily monitored or maintained.
Click here to learn more.

New ironless linear motor

The UXX is the most powerful standard ironless motor Tecnotion offers. It is ideal for heavy-duty industrial applications that demand ultra-precision and maximum-force output. With no cogging and zero attraction force between the coil and the magnets, it is ideal in flat-panel and semiconductor applications, and many others.
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Great references: Basics of Hydraulic/Pneumatic Cylinders design guide

After a reader asked me last week about some hydraulic cylinder basics, I was reminded of an excellent resource from Milwaukee Cylinder that interested engineers should download for themselves. Milwaukee Cylinder's Design Engineer's Guide does a fantastic job of covering basic cylinder operating principles, standard NFPA mountings, cylinder sizing, air and hydraulic cylinder force and speed, and much, much more. This is a no-cost, no-sign-up invaluable reference. Design Engineer's Guide is the 11th item on the page. Other good materials available.
Click here to go to the Guide page.

Open system linear position sensors

Novotechnik, U.S. introduces the PTP Series of open-housing position sensors. These cost-effective sensors are designed to be integrated into applications where they can be mounted in enclosed devices. Custom wiper interfaces are available. PTP Series sensors feature an ultra-compact profile of 13 mm (w) by 11.6 mm (h). Length is dependent on the application and typically is between 10 mm and 300 mm. Integral guides and mounting clamps make mounting quick, and other mounting options can be made. These sensors enable users to minimize costs in their applications, because the PTP Series can be ordered without a rod and side-actuated.
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Fast and svelte 6-axis robots

The new Epson C4 and C4L compact 6-axis robots feature faster speeds and more payload capability than the C3 models, while keeping the popular SlimLine design. These are some of the fastest compact 6-axis arms available in the industry. The slim body and compact wrist allow for the units to easily reach into confined and restricted work spaces from many angles with a smooth motion. The tight integration of powerful motors and amplifiers along with ultra-high-resolution feedback and superior controls provide unmatched motion performance, including higher acceleration and deceleration rates as well as advanced linear interpolated motion. They are ideal for small parts assembly, dispensing, lab automation, machine tending, material handling, packaging, and more.
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Step-by-step guide to automate welding

Are you considering automating of your welding process? Robotiq has designed a take-away guide and evaluation grid that will help you consider important aspects of the robotic welding process. This guide will also help you highlight the different points to evaluate at each stage and calculate your return on investment.
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Edge welded metal bellows:
Flexibility in more ways than one!

Edge welded metal bellows allow for flexibility in axial, angular and parallel offset motion and provide the most stroke in the smallest amount of space of any bellows technology on the market, by reaching 90% of its free length. BellowsTech can customize size, shape, material, weight, length, and mounting connections to customer specifications.
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Single-cable terminals reduce motion control costs

Beckhoff Automation has released the new EL7201-0010 servo terminal that supports innovative One Cable Technology (OCT), combining power and feedback signals into one streamlined cable. The EL7201 series servo terminals from the Beckhoff EtherCAT I/O system integrate a complete servo amplifier for motors up to 200W in a compact, high-density (HD) terminal housing measuring just 12-mm wide. One Cable Technology-equipped motors reduce wiring costs and keep commissioning costs to a minimum. In addition to solutions for stepper and DC motors, the servo terminals are designed for highly dynamic servo positioning tasks due to integrated, fast control technology.
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Ultra-compact linear smart stage now has absolute encoding

New Scale Technologies has added absolute encoding to its M3-LS Linear Smart Stage, a USB micro stage with fully integrated drive electronics and the industry's smallest all-in-one positioning stage. Absolute encoding eliminates the need to "home" the stage on power-up. It is a significant improvement over stepper motor-driven stages, which must be homed to locate the zero reference position every time power is cycled, and during operation can lose count of steps moved. The M3-LS Smart Stage is driven by a self-locking SQUIGGLE piezo motor and holds position when power is turned off. When restarted, its absolute encoding allows it to move directly and immediately to the commanded position with 0.5 µm resolution.
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Couplings add electrical insulation protection to mechanical components

Motion system designers have a new option to arrest electrical current. In addition to their primary function, Zero-Max CD couplings are designed with composite flex elements that are non-conductive. The flex element designed into Zero-Max CD couplings provides electrical insulation while protecting mechanical components from system overloads. CD Couplings do not pass electrical current through the coupling. In addition to protecting from stray electrical current, CD couplings protect generators in a system from transferring lower reaction loads to the generator bearings. They are available in many models and sizes, including custom designs for unusually large and challenging applications such as wind turbines.
Click here to learn more.

Voice coil actuators developers kit

To help customers get started with Voice Coil Actuators (VCA) and the sometimes confusing electronics needed for building a system, BEI Kimco Magnetics has introduced the VCA Developer's Kit -- the first of its kind in the market. The completely self-contained kit includes a VCA with a built-in feedback sensor and a programmable controller with MotionLab Software that runs on the user's local PC. The included how-to kit answers all the questions needed to get a VCA system up and running, including where to source components, how to put components together, and how to program the parts to perform the motions needed.
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Pumps and compressors with options

Thomas' line of twin piston pumps and compressors is designed to withstand the most demanding applications. Comprised of the 2660/2668 Series, these pumps and compressors feature air flows to 5.3 cfm (148.7 l/min), pressures to 160 psi (11 bar), and maximum vacuum to 990 mbar. The versatile platform design offers OEMs the ability to add custom options to meet or exceed their specific design criteria. The use of die-cast aluminum parts provides a strong, lightweight, and durable component. In addition to low vibration and reduced sound level, Thomas' oil-less WOB-L technology extends operating life.
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Shaft-protected position sensors

Novotechnik's LWX-002 Series shaft-protected position sensors are designed for extremely harsh environments. The all-metal sensor shaft is protected over its range of motion with an SS304 alloy, 0.9-mm-thick stainless steel shield. The LWX-002 Series has a patented differential pressure compensation system to address the pump effect -- pressure that can build up due to push-rod movement. This feature ensures the sensor series is free from degradation due to pressure buildup that can otherwise occur in rod sensors over time. Key specifications include operation with shock to 50 g and vibration to 20 g, stroke lengths from 50 to 750 mm, linearity to 0.04 percent, life to 50 million operations, and repeatability of 0.01 mm.
Click here to learn more.

High-precision XY nanopositioning piezo stage

PI's P-763 XY nanoposi-tioning stage is a new, lower-cost addition to PI's wide range of piezo stage positioners. The compact P-763 flexure-guided stage has a footprint of less than 3 x 3 in. (70 x 70 mm), while providing a 30- x 30-mm aperture. With a large travel range of 200 x 200 microns, this piezo positioning system is ideal for demanding applications such as image-stabilization, micro-lithography, nano-alignment, surface metrology, super-resolution microscopy, and bio-nanotechnology and photonics and datacomm.
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Cageless and high-peak torque motors

When an application does not require a motor to be in a caged structure, the TML and TMM cageless and high-peak torque motors from ETEL are lighter, lower-cost alternatives to ETEL's better known TMB model, yet still provide a direct-drive technology option. These motors can provide an ideal solution for applications that have less-demanding continuous-torque requirements. They are able to provide the same peak torque as the famous TMB range with up to 5,000 Nm and reach speeds to 2,100 rpm. The TML/TMM both come in multiple standard sizes that vary in diameter, length, and power, and each model offers different types of coil winding providing more performance variations.
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DARPA tests UAV-to-UAV refueling at 45,000 ft

DARPA completes close-proximity flight tests of two modified RQ-4 Global Hawk unmanned aerial vehicles, demonstrates technology enabling autonomous aerial refueling.

Global military aviation currently relies on a key enabler: aerial refueling. Fighters, bombers, reconnaissance, and transport aircraft use "flying gas stations" to go the extra mile.

Increasingly, UAVs are conducting combat and ISR operations, but they aren't designed to be refueled in flight. In 2007, DARPA teamed up with NASA to show that high-performance aircraft can easily perform automated refueling from conventional tankers, yet many unmanned aircraft can't match the speed, altitude, and performance of the current tanker fleet. The 2007 demonstration also required a pilot on board to set conditions and monitor safety during autonomous refueling operations.

But DARPA has been working to close this capability gap.

Global Hawk UAVs demonstrate close-proximity test flight.



DARPA's two-year Autonomous High-Altitude Refueling (AHR) program, which concluded Sep. 30, explored the ability to safely conduct fully autonomous refueling of UAVs in challenging high-altitude flight conditions. During its final test flight, two modified Global Hawk aircraft flew in close formation, 100 ft or less between refueling probe and receiver drogue, for the majority of a 2.5-hr engagement at 44,800 ft. This demonstrated, for the first time, that High Altitude Long Endurance (HALE) -class aircraft can safely and autonomously operate under in-flight refueling conditions.

The flight was the ninth test and the first time the aircraft flew close enough to measure the full aerodynamic and control interactions for unmanned-to-unmanned connections. Flight data was analyzed over the past few months and fed back into simulations to verify system safety and performance through contact and fuel transfer, including the effects of turns and gusts up to 20 knots.

Since HALE aircraft are designed for endurance at the expense of control authority, the program started with the expectation that only one in six attempts would achieve positive contact (17%). The final analysis, however, indicated that 60% of the attempts would achieve contact.

Multiple autonomous breakaway contingencies were successfully triggered well in advance of potentially hazardous conditions. Fuel systems were fully integrated and ground tested, demonstrating a novel "reverse-flow" approach with the tanker in trail. This approach opens valuable trade space for future developers to choose between various fixed and modular implementations of proven probe and drogue hardware.

"The goal of this demonstration was to create the expectation that future HALE aircraft will be refueled in flight," says Jim McCormick, DARPA program manager. "Such designs should be more affordable to own and operate across a range of mission profiles than systems built to satisfy the most stressing case without refueling. The lessons from AHR certainly extend beyond the HALE flight regime, and insights into non-traditional tanker concepts may offer further operational advantages."

Using this capability, U.S. military Global Hawk UAVS could fly nonstop for days or maybe even weeks.

Source: DARPA

SIDEBAR: Some basic Global Hawk stats courtesy of Northrop Grumman.

Q. How far can Global Hawk fly?

A. It has an inter-continental range (~11,500 miles). This means the aircraft can fly from New York and land anyplace in the world.

Q. How high can Global Hawk fly?

A. About 12 miles high -- an altitude almost twice that of airliners. From this height, you can see over 300 miles to the horizon.

Q. How long can Global Hawk fly?

A. More than 32 hours -- the longest of any high-altitude operational aircraft in the world.

Q. How much can Global Hawk carry?

A. It can carry equipment weighing 3,000 lb -- that's the weight of a Ford Focus.

Published November 2012

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