April 11, 2017 Volume 13 Issue 14

Motion Control News & Products

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Synchronous motors/drives don't need encoder

The SINOCHRON Motor design from ABM DRIVES offers advantages in continuous-duty applications like driving pumps and fans. The efficiency is also better in partially loaded duty cycles when compared to standard asynchronous motors. This motor can replace a stepper motor in some applications. Drive units are virtually loss-free in no-load operation. This motor design also offers advantages in powering conveying equipment, escalators, spooling machines, compressors, and traction drive units. By substituting existing line-powered three-phase drive units, energy savings of 20 to 35 percent can be expected.
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Mike Likes: TI doubles power density with motor control

Texas Instruments recently introduced two new device families that help reduce size and weight in motor drive applications. When used together, the brushless DC (BLDC) gate drivers and power blocks require half the board space of competing solutions. An 18-V compact BLDC motor reference design demonstrates how these components can drive 11 W/cm3 power and enable engineers to jump start their designs for smaller, lighter weight power tools, integrated motor modules, drones, and more.
Read the full article.


Stepper motor controller delivers 2,000x basic resolution

Precision positioning systems industry leader PI (Physik Instrumente) has released a higher performance model of its successful Mercury Stepper Motion controller. Stepper motors take up discrete positions in a revolution of a constant distance. Typical commercial models provide 200 to 1,000 full steps per revolution. Designed to deliver more than 2,000 times the basic motor resolution, the C-663.12 Mercury controller is the newest addition to PI’s suite of motion control solutions.
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Micro gripper for small, fragile part assembly

The MGR5 electric micro gripper from SMAC was designed for small, fragile part assembly. It features a light-force capability of 10 g or less and a soft-land capability for pick and place of delicate parts. Each jaw can be independently controlled in force, position, and velocity, with a 5-micron linear encoder standard (1 micron optional). Ideal for a wide range of positioning, measuring, and inspection applications, particularly where 100% verification is required.
See this new gripper in action.
Get more detailed info on this micro gripper.


Dual-feedback voice coil positioning stage

The VCS20-020-CR-01-MC-F3K voice coil positioning stage can operate under closed-loop position control with force monitoring or closed-loop force control with position monitoring. It uses H2W voice coil motor NCC20-18-020-1A to generate a continuous/peak force of 2 lb (8.9 N)/6 lb (26.7 N) with a total stroke length of 2 in. (50.8 mm). The 1-micron resolution encoder allows for precise positioning. The 3-kg rated force transducer allows for 0.01- to 3-kg of push/pull force feedback control. It comes supplied with a high-accuracy crossed roller bearing. The motor coil is the moving part of the assembly in order to reduce the moving mass of the system. Power is supplied to the motor via a high-flex, high-reliability flat ribbon cable.
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Thinnest moving coil linear motor in the world

At 6 mm wide, SMAC Moving Coil Actuators claims the LCA6 is the thinnest linear moving coil in the world. This unit is cross-roller guided, increasing accuracy. Flat coils are centered between cross rollers, so deflection load is reduced and rigidity is increased. In addition, the LCA6 is small and stackable, conserving space. The LCA6 is great for electronic pick-and-place, biomedical dispensing, and QC measurement. Specs include a linear stroke of 10 mm and peak force [N] = 3.5 @ 1.2 amps (24V).
Click here to learn more about this product line.


Program templates make automation even easier

Robotiq offers new tools to help collaborative-robot beginners save a lot of time programming Robotiq products and UR robots. Program templates are now available and ready to be downloaded from Robotiq’s online resource center. Every package includes a program file, step-by-step procedures, and a demonstration video. Four program templates are available: Stacking/Unstacking Using the Force Torque Sensors, Palletizing Using the Wrist Camera, Measuring Insertion Force, and Increasing the Wrist Camera’s Field of View. New programs are expected to come out every week.
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New industrial-grade optical encoder

Quantum Devices' Model QDH20 provides an improved feedback solution in demanding applications typically using a standard size 20 package. Outputs consist of a quadrature A & B with reference pulse Z as a standard feature. The output can be configured with either the industrial standard 5-V to 26-V OL7272 line driver or open collector outputs. The QDH20 features two heavy-duty bearing sets holding the output shaft and two more bearings along with an integral flexible spring mount to isolate the working pieces of the encoder from mechanical stresses. Features include 500-kHz fundamental frequency response, high-temp option (100 C), and high noise immunity.
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Cool Tools: New Fluke motor diagnostics tool incorporates machine learning

Fluke and Veros Systems have collaborated on asset performance and condition monitoring technologies to increase visibility into the efficiency and reliability of electric motor-driven machines. The Fluke 438-II Power Quality and Motor Analyzer is the first tool to result from that partnership. It analyzes three-phase power-quality measurements and uses an innovative method developed by Veros to calculate motor output torque, speed, horsepower, and efficiency. Using this information, engineers and technicians can evaluate system performance and detect overload conditions while the motor is operational, without the use of any mechanical sensing devices such as tachometers, strain gauges, or other intrusive sensors.
Click here to learn more.


Mini but mighty high-load linear actuator

Equipped with precision ground ball screws for higher speed and a longer service life, the L-239 high-force actuator from Physik Instrumente (PI) has a positioning range of 52 mm (2 in.), pushing force of 300 N (66 lb), and 50-mm/sec (2-in./sec) maximum velocity. The nonrotating tip enables uniform motion, preventing wobble, torque, and wear at the point of contact. Noncontact limit switches protect the mechanics, while a direction-sensing reference point switch speeds up the homing procedure and supports automation applications. Special versions available for vacuum applications.
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Motor Tech: UAV camera stabilization with brushless motors

Today, recon is dominated by unmanned aerial vehicles (UAVs) and drones due largely to concerns for pilots’ safety and costs. However, photos and videos obtained from UAVs are only useful if they are crisp and clear, which requires both precise focusing and extreme stabilization of the camera system. Compact and powerful FAULHABER brushless DC motors from MICROMO were selected to get the job done.
Read the full article.


Become a robot programmer in only 87 minutes!

Learning how to set up and program a collaborative robot -- or cobot -- no longer depends on real-life access to a robot or a training class. Now everybody with a desire to learn the concepts of cobots can log in to the Universal Robots Academy and get the introduction necessary to master basic programming skills. Become a master of the cobots! (That's a pretty sweet title.)
Click here to learn more.


Low-cost spring-applied brakes

Inertia Dynamics type FSB brakes are designed to decelerate or hold inertial loads when the voltage is turned off. These brakes can be mounted to a bulkhead or motor. The FSB brakes are rated up to 100 lb-in. static torque and fit motors up to 5.3 in. OD. Features include 12-V, 24-V, 90-VDC, or 120-VAC windings; bore sizes from 1/4 in. to 3/4 in.; low current consumption; and low cost. Metric bores and special voltages available.
Click here to learn more.


Are you using the Right Coupling for your motion control application?

Servometer® precision motion control couplings are available with both set screw and clamp style ends. Electro-deposited bellows technology offers seamless construction and the best combination of flexibility and strength among couplings technologies. These versatile, flexible nickel and stainless steel shaft couplings are capable of accommodating misalignments for parallel, angular and axial motion. Our recently released video showcases their unique characteristics, capabilities, design and various applications.
View video ...


Smart sensors provide health checks for motors

The ABB Ability Smart Sensor for motors uses compact sensors to pick up multiple data streams from low-voltage motors and provides information about motor health and performance via a smartphone or a dedicated web portal. By converting regular LV motors into intelligent, connected machines, the solution enables advanced maintenance planning that will help businesses cut costs and boost productivity. Predictive analytics based on data from the solution can reduce downtime up to 70%, extend motor lifetime by as much as 30%, and cut energy consumption up to 10%.
Click here to learn more.


Stanford researchers debunk popular flight models by flying birds through lasers

By Warren Duffie Jr., Office of Naval Research (ONR)

Resembling a feathered flying ace with his miniature protective goggles and chinstrap, the parrotlet named Obie stood ready to take off. On signal, Obie propelled into the air, flapped through a laser field infused with microparticles, and landed on another perch 3 ft away.

Obie the parrotlet dons his flying goggles for a test run at Stanford Univ.

 

 

The journey only lasted 3 seconds, but it challenged the accuracy of three aerodynamics models long used to predict animal flight. It also might impact future designs of bio-inspired drones, robots, and unmanned aerial vehicles (UAVs), a topic of interest to the U.S. Navy and Marine Corps.

Sponsored by the Office of Naval Research (ONR), researchers at Stanford University found a new way to precisely measure the vortices -- the circular patterns of rotating air -- created by birds' wings during flight. The results shed greater light on how these creatures produce enough lift to fly.

"One of the most exciting recent advances in understanding flying animals has been the use of new technologies like this to collect all kinds of data in free-flight conditions," said Marc Steinberg, an ONR program manager who oversees the research. "We can learn what's really happening -- the biology and physics -- and apply it to create UAVs capable of navigating challenging environments like under a thick forest canopy or through urban canyons."

Led by Dr. David Lentink, the Stanford team tested three models commonly used to estimate how much lift birds, and other flying animals, generate when flying.

First, they had Obie and other parrotlets fly several times through a laser field flashing 1,000 times per second, lighting up nontoxic aerosol particles the size of a micron (one thousandth of a millimeter).

As Obie flapped through the field, thin mist particles moved around his wingtips and were photographed by super-high-speed cameras -- creating a new picture of the vortices in the wake of a flying animal. The Stanford researchers took this data and combined it with measurements gathered from another instrument, an aerodynamic force platform, invented in Lentink's lab with support from ONR.

"The platform is basically an ultra-sensitive weight scale that measures the force generated when a bird takes off in a specially designed flight chamber," said Lentink, an assistant professor of mechanical engineering.

The researchers then applied each of the three prevailing models to these new measurements multiple times. In each case, the existing models failed to forecast the actual lift of the parrotlets.

The problem is that long-standing models are based on historical measurements taken a few wingbeats behind a flying animal, resulting in predictions that wing vortices stay relatively frozen over time -- like the puffy clouds that form and dissipate slowly in an airplane's wake. Lentink's research, however, demonstrates that birds' wing vortices actually break up suddenly and violently, within two to three beats.

"For a long time, engineers have looked to animal flight literature to see how robotic wings could be designed better," said Lentink. "But that knowledge was based on inaccurate models for lift. We now know we need new studies and methods to inform this design process better. I believe our method, which measures lift force directly, can contribute to such improvements."

Future stages of Lentink's research will involve applying his new lift model to studies of how winged drones and UAVs can perform missions in environments that are difficult to navigate, such as dense woodland. His work is sponsored by an ONR Multidisciplinary University Research Initiative focusing on unmanned, autonomous flight.

Source: ONR

Published April 2017

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