In many purposes, metering elements within the pharmaceutical or meals industry for example, pumps are required that not solely can be precisely controlled in terms of circulate rate and dosing time, but additionally convey the elements notably gently. To allow the proven pump items of the ecodos series from LEWA GmbH to fulfill this demanding task with even more flexibility and vitality effectivity sooner or later, the manufacturer is expanding the portfolio to include a new type of wide-range pace management. Alongside asynchronous motors and servomotors, everlasting magnet synchronous motors, or PMSMs for short, are also used now. They are characterised by excessive energy efficiency and a control range larger than 1:200. This considerably expands the range of functions. With PMSMs, it’s now not needed to use a quantity of pumps for different circulate charges or oversize asynchronous motors for low speeds. Since PMSMs could be designed and not utilizing a fan, they continue to be compact and simple to clean. The latter characteristic predestines them for hygienic applications. High efficiency rating over the entire management vary in accordance with vitality efficiency class IE5+ also reduces power costs, thus making certain a lower total value of possession (TCO).
The diaphragm metering pumps in the LEWA ecodos series are particularly nicely suited for functions within the meals or pharmaceutical industries. All supplies involved with the fluids used in the pump units meet the FDA and USP Class VI necessities, and the EU directives for the meals business. In the hygienic model, for instance, the pump head is made of PP or electropolished stainless-steel with a surface roughness < zero.5 µm. This facilitates cleaning of the surfaces in touch with the product.
The motor applied sciences used so far have had to make sacrifices: “For classic asynchronous motors whose rotor is a squirrel-cage rotor, the management vary stays restricted to 1:10 (1:50 is possible in particular person cases). With encoder suggestions, important expansion is feasible,” mentioned Maurice Wirkner, an software supervisor at LEWA. “In addition, the drive is comparatively inefficient outside the rated speed range – especially at low speeds. This requires the drive to be outsized, which increases operating costs.” Servomotors are optimized for extremely dynamic requirements and in addition cowl the whole management range (1-210 pump strokes), nevertheless, they’re costlier to buy and in addition, require a servo inverter for control.
Wide-range pace control with permanent magnet synchronous motor extends the vary of functions

LEWA has now expanded its own portfolio with a drive technology that does not have these weaknesses. “Unlike the asynchronous motor, the rotor of this drive consists of everlasting magnets and rotates synchronously, i.e. without load-dependent slip,” Wirkner defined. “Among เครื่องมือที่ใช้ในการวัดความดัน , it options an excessive management vary, which frequently makes the use of a quantity of pumps for different flow rates unnecessary.” Particularly within the case of multiple pumps, a further guide stroke adjustment or electric stroke adjustment may be distributed with and the required circulate rate may be realized by speed management solely. The PMSM also has a continuing torque. The full torque may be utilized from engine pace zero rpm (standstill) as a lot as the rated speed of the motor. This ensures particularly smooth and mild system start-up, since every course of could be began with a pump capability of 1 percent instead of the usual 10 %.
It also contains a high short-term overload capability, which enables a drive design without oversizing for the beginning torque. As a result, smaller, more cost-efficient sizes could be realized than with traditional drives. “Like the asynchronous motor, the PMSM can be controlled through a normal frequency converter, so users can rely on widespread parts,” Wirkner explained. “With the servomotor on the contrary, it might be needed to buy costly servo controllers.” The compact drive may be easily cleaned as a outcome of its fanless design and presents excessive IP safety. If required a further conversion process – known as nsd tupH – can be applied to the aluminum body for FDA requirements. This makes the surface extremely resistant and even easier to wash – perfect for purposes with stringent hygienic necessities, corresponding to aroma metering in the meals industry or additive dosing in the pharmaceutical business.
IE5+ PMSM enables cost reduction and decentralized solutions

The sole limitation of the at present used PMSM is that it’s only out there for secure areas. “Thanks to wide-range speed management with IE5+ PMSM, we will meet the growing buyer demands for a wider adjustment range and decrease power consumption, as properly as total prices,” said Wirkner to sum up the scenario. “The matter of vitality effectivity particularly is becoming increasingly necessary for our prospects. A decentralized solution by which the frequency converter is installed instantly on the PMSM, can now be carried out with Getriebebau NORD GmbH & Co. KG, LEWA’s motor associate for PMSM, too.”

LEWA GmbH was founded in 1952 by Herbert Ott and Rudolf Schestag as a household enterprise and is at present the world’s leading manufacturer of metering pumps and process diaphragm pumps in addition to full metering packages for process engineering. Headquartered in Leonberg, the company developed into a global group in just a few many years. Since 2022, the corporate has been a half of the Atlas Copco Group, a globally leading Swedish manufacturer of compressors, vacuum options, mills, pumps, power instruments and meeting methods. Together with the new proprietor, LEWA will additional increase the commercial pumps business. As a analysis and manufacturing firm, LEWA develops applied sciences and provides solutions for the huge array of applications among its clients. Its products are used primarily within the chemical business, the cosmetics trade, pharmaceuticals and biotechnology, meals and beverage industry and energy utilities as nicely as in the production of plastics, detergents and cleaners. Additional software areas embrace refineries and petrochemicals, the oil and gasoline trade, and gas odorization. LEWA at present employs around 1,200 individuals and owns 14 subsidiaries around the globe alongside having 80 representatives and sales offices in more than eighty international locations.
Image material:
Image ID: LEWA ecodos LED3 WBR.jpg

Caption: LEWA ecodos LED3 with PMSM

Source: LEWA GmbH

Image ID: ecodos_NORD-IE5plus_opt.jpg

Caption: The PMSMs newly added to the portfolio function a management vary of 1:200, enabling a wider range of applications to be lined by the same drive or pump.
Source: LEWA GmbH

Image ID: Baby food.jpg

Caption: The PMSM additionally has a constant torque, i.e. all the torque could be referred to as up at pace 0 rpm. This ensures significantly smooth and mild system start-up, since every process may be started with a conveyance fee of 1 % as a substitute of the identical old 10 p.c. (Example: Metering omega three fatty acids in the manufacturing of child food)

Source: Adobe Stock

Image ID: Torque.jpg

Caption: In distinction to the ASMs proven, the constant torque of the PMSM allows steady operation at low speeds. Oversizing for the required pump starting torque has turn into pointless due to the excessive overload functionality of the PMSM.
Source: LEWA GmbH

Image ID: Baugrößen_530PWebJPG.jpg

Caption: Like the asynchronous motor, the PMSM can be managed through a normal frequency converter (NORD, Danfoss, etc.) with particular parameterization, in order that users can depend on widespread elements.
Source: Getriebebau NORD GmbH & Co. KG

Image ID: NORDAC ON Wandmontage BG2_806x502Web.jpg / Nordac ON+ with frequency converter on an IE5 PMSM.jpg

Caption: Decentralized options in which the frequency converter is installed immediately on the PMSM are additionally already possible with the PMSMs selected by LEWA.
Source: Getriebebau NORD GmbH & Co. KG

Image ID: Functional testing.jpg

Caption: As early as 2020, LEWA carried out preliminary functional testing with the NORD PMSM prototype and an ecodos pump on the pump take a look at bench. In the decrease velocity vary above all, the PMSM successfully demonstrated some nice advantages of constant torque: the ecodos take a look at pump might be driven in a range of 1:480 up to 5 bar.
Source: LEWA GmbH

More data for readers/viewers/interested parties:
LEWA GmbH

Ulmer Straße 10, 71229 Leonberg, Germany

Phone: +49 7152 14-0, Fax: +49 7152 14-1303

Email: lewa@lewa.de

Internet: www.lewa.de

More information for members of the press

ABOPR Pressedienst B.V.
Stefan-George-Ring 19, 81929 Munich, Germany

Phone: +49 89 500315-20, Fax: +49 89 500315-15

Email: info@abopr.de

Internet: www.abopr.de

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