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You are here: Home / Featured / Without micromotors global logistics would be lost

Without micromotors global logistics would be lost

August 28, 2020 By Danielle Collins Leave a Comment

Always more, always faster, always farther — everything needs to arrive at the right time at the right place.

The global goods cycle keeps the economy running and presents challenges for everyone involved. Its function relies on extensive automation within the logistics chain, which would be almost impossible without an armada of high-performance micromotors. These motors often need to generate high forces in extremely small spaces and, above all, must always work reliably in continuous duty operation. This is why drives from FAULHABER can frequently be found in these challenging applications.

micromotors
Toru Logistics Robot

Despite sounding similar and being closely related, the term “logistics” does not originate from the ancient Greek root word “logic,” but rather from French military jargon. Since the end of the Middle Ages, the “maréchal de logis” — the quartermaster — was responsible for providing marching and fighting troops with somewhere to sleep and rest. The quartermaster’s range of tasks grew with time and began to extend to many other parts of the overall supply chain. So what started out as simply providing “logis,” or accommodation, evolved into extremely complex military logistics.

The quartermasters originally belonged to the cavalry because the transmission of information has always been key to logistics. Until the 19th century, horses were used to relay information as fast as possible. Nowadays, electromagnetic waves that are propagated through the air and along cables perform this task somewhat more quickly. Today, the largest data volumes are transmitted using fiber optic cables. They form the backbone of the global logistics network. The cables transmit the necessary information by means of light signals — from the online order, through shared just-in-time production in smart factories, to express doorstep delivery.

Connections with nanometer precision

micromotors
Toru Robot

Two fiber optic cables must be joined together, fiber-by-fiber. This is extremely delicate work because each individual optical fiber is as thin as a human hair. The optical core is even thinner, with a diameter of just five microns.

When two of these optical fibers are joined together, the two ends must line up precisely so that signals can be transmitted cleanly and without disruption. On construction sites, the precise alignment is carried out by small mobile machines. The individual fiber ends are first cut to length with an exact 90 degree cut, the protective insulation is stripped away, and the fibers are placed in the alignment device. The device automatically and accurately aligns the two pieces in three dimensions so that the flat ends meet precisely. The ends are welded together and then insulated again to ensure secure connection of the fibers and unimpeded flow of the signals. This nanometer-precise alignment is performed with positioning drives from FAULHABER: DC-micromotors of the 1524…SR series, with gearhead, lead screw, and high-resolution encoder. Drives that work with high-precision stepper motors are also used here.

High degree of automation in warehouse systems

micromotors
BXT motors

Thanks to this technology, the fiber optics can transmit the signals for a digital order over long distances at the speed of light, without errors. Orders can be sent by an end customer to an online shop, or by a production plant to a supplier. In both cases, a whole series of processes are set in motion. Ultimately, these processes result in products being retrieved from a storage facility and prepared for shipping.

Today, an increasing number of work steps involved in storing items in warehouses, retrieving these items, and preparing them for dispatch are being taken over by automatic storage and retrieval machines, driverless transport systems, and intelligent logistics robots. The computer-controlled machines receive a work order and then move automatically to the target rack space to deposit or collect an item. To enable this, the autonomous systems are equipped with (depending on the type of rack system) lifting columns, telescopic arms, or grippers that grasp and move the packages or trays.

Logistics Robots

On board these automatic devices, there is typically limited space for the motors that are needed to drive them. The motors are frequently installed directly in the handling elements. There, despite their compact footprints, the motors often have to lift heavy loads. Speed also plays a role. In the huge storage facilities of e-commerce companies, many thousands of orders are processed every day, so the individual storage and retrieval steps must be performed at a rapid speed.

Precision, power, and speed

micromotors
BX4 Motor

A typical system of a lifting column and gripper used on a logistics robot contains a drive unit that includes FAULHABER brushless DC servo motors of the BX4 series with motion controller and planetary gearhead. When used in the lifting column, for example, this combination ensures precise positioning, exact retrieval, and reliable processes during continuous operation with constantly changing loads. The automated processes are monitored to some extent by camera systems. FAULHABER motors are again frequently used to drive high-quality, moving cameras.

micromotors
CXR Motor

After retrieval, the item is usually deposited on a conveyor belt or roller conveyor. These conveyors generally have track switches, paddles, or pushers to separate individual packages or elements and to move them onto the desired processing path. In large warehouses — in which thousands of packages per hour are transported on such conveyor systems — the speed of the automatic sorting systems is a key factor. The track switches must be moved to exactly the right position in a fraction of a second. DC-micromotors of the 2237…CXR and 2342…CR series in combination with a gearhead are frequently used for this task.

Transport tasks are also commonly performed by automated guided vehicles (AGVs). These vehicles are equipped with mounted modules for handling their cargo. Moving levers, clamps, and pins ensure that the items are fixed securely during transport. The moving elements each are equipped with a drive.

Economical packaging

The items are transported to the packing station where they are put into a shipping box. In modern systems, however, “where they are packed in a made-to-measure shipping box” would be more accurate because automated packing stations use sensors to detect the dimensions of the item to be shipped and fold an appropriately sized box from a cardboard sheet. This not only saves material, but also reduces shipping costs because the logistics service providers set their prices according to both volume and weight. The actual folding work is performed by small levers and paddles in the packaging machine. Servo drives with integrated motion controllers from FAULHABER are optimally suited for moving these elements.

micromotors
BP4 Motor

If packages are stacked on pallets for shipment, they need to be fixed securely in place. Straps made of fiber-reinforced plastic are commonly used for this. These straps are attached using so-called strapping tools, which tension and weld the strap so that it is tight against the stack and holds it securely. Individual packages can also be stabilized in this way. As the tools are handheld, weight is a particularly important factor — every gram saved helps protect the health of employees. For this reason, the motors used for tensioning need to be as small as possible, such as the 3274 …BP4 brushless DC servo motor. It weighs just 320 grams, but can achieve a peak torque of over 1 Nm, which ensures that even heavy loads are secured safely.

“Our motors are used in virtually every area of the logistics chain,” says Rolf Schmideder, Business Development Manager at FAULHABER. “Our drives and the typical requirements — maximum power, speed, and precision, with minimum volume and weight — are simply the perfect match. And the range of possible applications will be even greater if, in the future, drones and robots are also used for delivering individual items.”

https://www.faulhaber.com/en/markets/logistics-/-packaging-robot/

https://www.faulhaber.com/en/products/dc-motors/faulhaber-sr/

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