November 06, 2012 Volume 08 Issue 41

Motion Control News & Products

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High-speed motors for medical and dental hand pieces

The new FAULHABER 2057...BHS Brushless DC Servo Motors are designed to address the specific requirements of the medical and dental hand-piece markets. While remaining cool to the touch, the high-efficiency, slotless design features smooth speed control with a wide, continuous duty speed range up to 40,000 rpm. The motors are capable of handling intermittent overload conditions to address highly dynamic motion over shorter cycle times. Low vibration, which reduces user fatigue, and low audible noise are ideal for long periods of use in sensitive medical and dental patient environments. The new motors come standard with digital hall sensors, and analog hall sensor feedback is available on request.
Click here to learn more.


Flyweight motor, heavyweight performance

In the fight for high performance with minimum weight, FAUL-HABER's 3274 BP4 available from MICROMO is the new champion in the ring. This brushless DC servo motor, measuring 32 mm in diameter and 74 mm in length, has massive continuous torque of 165 mNm. Surprisingly, it weighs in at just under 320 g, which is half the weight of conventional motors with comparable power.
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How Universal Robots optimized production by 35%

Watch how Universal Robots optimized production by 35% at the milling machine while offering an ROI of 18 months at OTV Plast. Letting the robot arm take over many repetitive manual tasks enabled OTV Plast to bid for orders not possible before.
View the video.


eBook: Compare 11 collaborative robots

Robotic-gripper specialist Robotiq has put together a really informative eBook that includes a review of 11 popular and emerging collaborative robots for industrial applications. An extra comparative chart with all the main specifications of each robot makes the publication all the more useful. Learn key features, pros and cons, and main specifications of robots from KUKA, Bosch, ABB, Universal Robots, Rethink Robotics, and more.
Click here to learn more.


Micro series lead screws in 24 hr

Haydon Kerk Motion Solutions has added Kerk Micro Series lead screws to the Haydon Kerk Express Web store, with three different options available for 24-hr shipment. Standard and "prototype" style nuts also are available. Haydon Kerk lead screws and nuts can be modified to suit an application's dimensional needs. Prototype kits allow engineers to have parts in hand within 24 hr after placing an order. Custom screw materials, such as heat-treated 400 series stainless steel, are available, while custom nut materials, including PEEK and PPS, can be used to meet specific application requirements.
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Catalog: Latest Clippard mini pneumatics

Clippard Instrument Laboratory, manufacturer of the industry's most complete line of miniature pneumatic products, has just released their all-new full-line catalog. This edition features over 10 new product lines and includes specifications, technical drawings, and application highlights. Clippard has been serving the needs of design engineers around the world since 1946.
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DC tachometer catalog

The new Servo-Tek tachometer catalog includes detailed specifications of all Servo-Tek high-performance DC tachometers for precision speed control applications. A Servo-Tek DC tachometer generator provides a convenient and economical means of converting rotational speed into an isolated analog voltage signal suitable for remote indication and control. While the catalog contains information on their most popular models, Servo-Tek also manufactures countless special tach generators. The 8-page catalog also includes technical info, outline drawings, and assembly and maintenance information.
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Tools: Universal Robot launches URCaps 'app store' for UR robots

With URCaps, Universal Robots has created the equivalent of an app store for its lightweight, easily teachable, and highly competent robots. URCaps is a platform where distributors and integrators can present accessories that run successfully in UR robot applications to end users. The online platform features useful accessories, hardware, and software extending the capabilities (or "caps") of the robot arms developed by the Danish robot manufacturer. The first 43 caps, a combination of workbenches, vision solutions, cables, jaws, and grippers, are already featured on the platform and have been through thorough trials and integration testing.
Click here to learn more.


Mini voice coil actuator packs a punch

The small, yet powerful model LAH04-10-000A Linear Voice Coil Actuator (VCA) from BEI Kimco Magnetics delivers a peak force of nearly 0.5 lb and measures just 0.375 in. OD. With a total weight of 0.37 oz, the moving-magnet design produces over 20 times its own weight in terms of force with an operating stroke of 4 mm (0.157 in.). No moving wires and a high heat dissipation make this VCA particularly well-suited for high-duty cycle applications such as pick-and-place machines, remotely controlled switching, medical and laboratory equipment, military and aerospace.
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High speed, no backlash, and zero cogging!

MotiCont's DDLMs (Direct Drive Linear Motors) eliminate backlash and provide an economical solution for users requiring high acceleration, high speed, and long life. They are available in three popular off-the-shelf models. The smallest is only 0.75 in. in diameter and 1.75 in long. It has a stroke of 0.46 in. and features 11 oz of continuous force and 34.8 oz peak. For higher-force applications, the largest is 1.5 in. in diameter and 2 in. long and has a stroke of 0.375 in., with a continuous force of 3.1 lb and 9.9 lb peak. Custom DDLMs are easily fabricated. Typical DDLM applications include: automated assembly, component insertion, fluid dispensing, pick and place, robotics, and more.
Click here to learn more.


Hear it for yourself -- super-quiet DC brush motors

Crouzet Motors has introduced a short, informative video that dramatically demonstrates the whisper-quiet operation of its innovative new DC Brush Motor line. The video tests and measures the sound levels of the Crouzet DCmind Brush motor vs. conventional DC brush motors, and also evaluates the sound levels when used with gearheads. The results: The DCmind brush motor measured 15 decibels (dB) quieter in stand-alone operation compared to a conventional DC motor. The DCmind Brush motor series is particularly well suited to applications in medical, laboratory, commercial, and industrial equipment.
Click here to learn more.


Segmented encoder for big machines

The Leine & Linde MRI 2000 rotary encoder is designed to provide feedback solutions for large rotating machinery typically found in the construction, pulp and paper, oil and gas, wind, and marine industries. This encoder has received significant performance upgrades since its introduction two years ago. The MRI ring encoder is segmented into pieces to facilitate simple commissioning and service, and it is now available with an alternative magnetic structure, enabling relaxed tolerances for the sensor pickup mounting. Radial gap tolerances have been doubled, allowing up to 6 mm between the sensing head and the ring surface. In addition, frequency response of the pickup has been doubled as well, providing the opportunity for higher shaft speeds. Exclusive North American distribution through HEIDENHAIN Corporation in Schaumburg, IL.
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Plastic bearings have staying power

Plastic bearings are strong enough to outperform and outlast metal in countless applications. Plastic bearings are an economical replacement for needle, ball, and plain metal bearings. However, they are often not considered a viable choice in the engineering community due to the common misconception that plastic is inferior or weaker compared to metal. Uncover common misconceptions and learn the true reliability of plastic bearings in this new igus® whitepaper.
Click here to go to the whitepaper -- no registration required.


New gearbox sizing tool

GAM's new Sizing Tool makes it easy to find the right gear reducer, coupling, or linear mount product compatible with your motor. Simply select your motor, adjust the ratings based on the application, and narrow down the products that match. Over 9,000 of the most popular servomotors on the market are available for selection. After choosing a motor, easily narrow down the list of matching products by filtering attributes.
Click here to learn more.


Positioning accuracy that rivals a glass scale

The newly enhanced IMS-I integrated measuring system from Rexroth achieves maximum linear motion positioning accuracy even in challenging work environments with contaminants and interference fields. This compact solution for ball and roller rail systems has an inductive design that offers repeatable accuracy rated to 0.25 µm at distances up to 4.5 m -- equivalent to more expensive glass scale systems. This solution is suitable for a wide range of industrial applications, including positioning laser cutters, synchronizing ram or plunger units in presses, extracting PET bottles at high speeds, and 3D printer processes that produce abrasive dust.
Click here to learn more.


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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