November 06, 2012 Volume 08 Issue 41

Motion Control News & Products

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Tiniest load cell yet!

The LLB130 Miniature Load Button from FUTEK has a capacity range from 1,000 g to 50 lb and is RoHS compliant. All capacities are in stock and ready to ship. This mini load cell features low deflection and fast response time, and it is fully internally temperature compensated.
Click here to learn more.

Mini linear positioning stage for single- and multi-axis applications

The L-402 compact linear stage from PI (Physik Instrumente) is well suited for micro-manipulation, test systems, and opto-mechanical alignment automation applications. With a travel range of 1/2 in. (13 mm) and velocity to 0.2 in./sec (5 mm/sec), the L-402 delivers high accuracy and smooth motion for loads up to 1 lb with minimum incremental motion and repeatability down to 0.5 microns. Long service life and excellent guiding accuracy with minimum backlash are guaranteed by creep-free crossed roller bearings. The stage comes with the choice of two direct-drive motors, a DC servo motor with closed-loop encoder and 2-phase stepper motor. Other encoder options for OEMs are also available.
Click here to learn more.

Frameless limited angle torque motor

H2W has developed an unhoused arc segmented frameless brushless torque motor (TWR-070-410-1150-3PH) with low-inertia moving coil assembly for high angular acceleration applications. The rotary 3-phase brushless motor, also known as a rotary servo motor, is a direct drive motor that is ideal for limited or unlimited, closed-loop servo, rotary motion applications. It can generate a continuous/peak torque of 480 in.-lb [53 Nm]/1440 in.-lb [159 Nm].
Click here to learn more.

High-precision, low-cost motorized vertical lift stage

The AT20-100 Motorized Vertical Lift Stage from Optimal Engineering Systems (OES) is a very stable, high-precision, high-load stage that can be easily integrated into almost any application. The large 120-mm x 180-mm (4.72-in. x 7.08-in.) drilled and tapped platform has a vertical travel of 100 mm (3.93 in.) and features: 3.315-µ (non- Micro-Step) resolution, 5-µ repeatability, and 15-µ positional accuracy. The precision-ground lead screw, precision linear bearings, and the rigid box construction of the moving component of the elevator stage assure smooth and flat vertical motion. Load capacity to 50 kg (110 lb). Applications include: testing, inspection, assembly, sampling, laser drilling, and machining in a broad range of industrial, medical, semiconductor, and research facilities.
Click here to learn more.

Micro Solutions: Myoelectric robotic prosthesis puts innovation in hand

The Bebionic myoelectric hand prosthesis was recently developed to help with daily life challenges. Powerful, small FAULHABER motors ensure that the prosthesis can grip without any problems, quickly and firmly, and maintain a constant gripping force. Two electrodes integrated into the prosthesis shaft detect the myoelectric signals and forward them to the control electronics. These signals are amplified and used to activate the 5 small electric motors.
Read the full article.

Adapt your motor to your application: Integrated 400-W servo motor with battery supply

The MAC402 from JVL Industri Elektronik is a complete 400-W solution for medium power ratings with battery supply 12-48 VDC. This solution features: peak power up to 1,200 W, absolute multiturn encoder without battery, real-time industrial Ethernet (Profinet, Ethernet/IP, MODBUS TCP, EtherCAT, Powerlink, and SercosIII), two RS422 channels for encoder in/output and SSI encoder, and six I/O. Choose between models with or without brakes. IP55 standard. IP66 optional. Wireless, industrial Ethernet connectivity, or PLC built in. Distributed by Electromate.
Click here to learn more.

Optimize mechanical misalignments, get hidden benefits

C-Flex Couplings combine the best qualities of disc, beam, and bellows couplings in a unique and economical new design. Made to couple two rotating shafts together, these couplings can accommodate large misalignments while transmitting high torque loads with zero backlash. Benefits include lower energy usage and less-frequent bearing failure, since less stress is placed upon bearings. Constructed using high-strength hardened stainless steel or glass impregnated polyamide flexures, these couplings require no maintenance and provide years of trouble-free life, even in contaminated environments. Flexible Pivot Bearings and Super Plastic Torsional Damping Couplings are also available.
Click here to learn more.
Watch C-Flex Couplings in action handling misalignments.

Motion: Drive nut runs on threadless shaft -- eliminates risk of jamming

Amacoil-Uhing Model RS drive nuts provide smooth, backlash-free linear motion in machine design. Unlike a screw, the RS drive nut runs on a smooth shaft, eliminating the potential for debris to become trapped in threads that could then clog or jam. Slipping, as opposed to the churning and grinding associated with screw-based systems, prevents damage to the nut and other components in the linear motion system. This reduces downtime for repairs and enables more consistent production rates. RS linear drive nuts offer axial thrust from 22 to 449 lb and require no maintenance except periodic lubrication of the shaft with grease.
Click here to learn more.

High-speed motor for med devices and equipment

The new 28-mm, 24-V ResMax 28 brushless motor from Allied Motion is engineered to achieve very high speed (up to 90,000 rpm) with great dynamic responsiveness (0 to 50,000 rpm in only 20 ms, unloaded). It has exceptional operating life (30,000+ hours at 40,000 rpm average speed), maximal efficiency (up to 90 percent), rated power of 46 W, and the ability to operate in an oxygen-rich environment. The motor is equipped with integrated Hall-effect sensors and a NTC thermal sensor.
Click here to learn more.

Mini on-the-go robotic welding cell features Kuka robot

A mini robotic cell developed by German integrator Paul von der Bank is in operation at Bruninghaus & Drissner in Hilden, Germany, just east of Dusseldorf. In the confined space of this portable “Welding To Go” (WTG) 1200 cell, a KUKA KR 6 R 700 sixx robot from the AGILUS series performs welding tasks with precision three shifts a day. The whole unit works in a footprint the size of a wooden pallet -- about 40 in. x 48 in.
Watch the mini robot welder in action.

Mini voice coil motor features high force-to-size ratio

MotiCont's miniature linear voice coil motor, LVCM-022-013-01, features a high force-to-weight ratio of 14.5 oz continuous force and 45.7 oz peak force in a compact 0.875-in. diameter x 0.50-in.-long package. This clean, quiet, efficient, low-inertia, high-acceleration, high-speed motor has zero cogging and features high accuracy and high repeatability to less than 1 μm when operated in a closed loop as a DC servo motor.
Click here to learn more.

Palm-size XY/XYZ motorized stage is fast and precise

PI (Physik Instrumente), a top provider of precision motion control and positioning solutions for more than four decades, has released the low-profile M-122 motorized positioning stage. This stage has a very small footprint of 60 mm x 86 mm and a travel range of 25 mm, best suiting it for research and industrial applications, including fiber alignment, metrology, quality assurance testing, photonics packaging, test equipment, and micromachining.
Click here to learn more.

Toothed-belt linear axes in customizable sizes

To simplify product selection of maintenance-free, self-lubricating linear guides, motion plastics specialist igus has developed a modular construction kit for belt-driven DryLin ZLW linear axes. Using the new ZLW toolkit, customers can customize their own solutions, including rail widths, system length, etc. -- even for small installation spaces. Cross beams, rails, and/or carriages are available in either aluminum or stainless steel to suit a wider range of application requirements, especially food and lab settings. These systems were developed for high-speed applications with low loads and are better for high accelerations than ball bearings. Underwater applications are possible via a special toothed belt.
Click here to learn more.

Encoders: Rotary motion control in extreme environs

Novotechnik U.S. introduces the Vert-X 51 Series of rotary magnetic encoders, which feature up to 16-bit resolution and repeatability to 0.1 deg, depending on model. Measurement range in this series is 0 to 360 deg, and physical measurements of the housing are 30 mm x 50 mm. These encoders are ideal for harsh environments with ingress protection to IP 67, and stainless steel housing and shaft are available. Vert-X 51 Series is designed to operate with shock up to 50 g and vibration to 20 g as well as axial and radial shaft loads to 45 N. Ideal for marine propulsion, off-highway, and other applications
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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