Wide-range Speed Control for Diaphragm Metering Pumps: LEWA ecodos collection with new motor

In many functions, metering ingredients in the pharmaceutical or food business for instance, pumps are required that not solely could be precisely controlled by method of circulate fee and dosing time, but also convey the ingredients particularly gently. To allow the confirmed pump models of the ecodos collection from LEWA GmbH to fulfill this demanding task with much more flexibility and power effectivity in the future, the producer is increasing the portfolio to incorporate a brand new type of wide-range pace management. Alongside เกจวัดแรงดัน and servomotors, permanent magnet synchronous motors, or PMSMs for brief, are also used now. They are characterised by high vitality efficiency and a control vary greater than 1:200. This considerably expands the vary of applications. With PMSMs, it’s no longer needed to use a quantity of pumps for various flow charges or oversize asynchronous motors for low speeds. Since PMSMs can be designed with no fan, they remain compact and simple to wash. The latter feature predestines them for hygienic applications. High efficiency rating over the whole management vary in accordance with energy effectivity class IE5+ also reduces power costs, thus guaranteeing a decrease whole cost of ownership (TCO).
The diaphragm metering pumps in the LEWA ecodos sequence are notably properly suited to applications in the food or pharmaceutical industries. All supplies in touch with the fluids used within the pump units meet the FDA and USP Class VI necessities, and the EU directives for the meals trade. In the hygienic version, for example, the pump head is made of PP or electropolished stainless steel with a floor roughness < zero.5 µm. This facilitates cleaning of the surfaces in touch with the product.
The motor technologies used thus far have needed to make sacrifices: “For basic asynchronous motors whose rotor is a squirrel-cage rotor, the management vary remains restricted to 1:10 (1:50 is feasible in particular person cases). With encoder suggestions, significant expansion is feasible,” said Maurice Wirkner, an software supervisor at LEWA. “In addition, the drive is relatively inefficient outside the rated speed range – particularly at low speeds. This requires the drive to be outsized, which increases operating costs.” Servomotors are optimized for highly dynamic requirements and in addition cover the entire management range (1-210 pump strokes), however, they’re costlier to purchase and in addition, require a servo inverter for management.
Wide-range pace control with everlasting magnet synchronous motor extends the vary of applications

LEWA has now expanded its own portfolio with a drive know-how that doesn’t have these weaknesses. “Unlike the asynchronous motor, the rotor of this drive consists of permanent magnets and rotates synchronously, i.e. with out load-dependent slip,” Wirkner explained. “Among other issues, it features an excessive control range, which regularly makes using multiple pumps for various circulate charges unnecessary.” Particularly within the case of multiple pumps, an extra guide stroke adjustment or electrical stroke adjustment could be distributed with and the required circulate fee may be realized by speed management only. The PMSM also has a relentless torque. The complete torque can be utilized from engine pace zero rpm (standstill) as a lot as the rated speed of the motor. This ensures notably easy and delicate system start-up, since every process may be started with a pump capacity of 1 % instead of the standard 10 p.c.
It also contains a high short-term overload capacity, which allows a drive design with out oversizing for the beginning torque. As a result, smaller, extra cost-efficient sizes can be realized than with basic drives. “Like the asynchronous motor, the PMSM can be managed by way of a standard frequency converter, so customers can rely on widespread parts,” Wirkner defined. “With the servomotor on the contrary, it would be needed to purchase expensive servo controllers.” pressure gauge could be simply cleaned as a outcome of its fanless design and presents excessive IP protection. If required an extra conversion course of – referred to as nsd tupH – could be applied to the aluminum physique for FDA necessities. This makes the floor extremely resistant and even easier to wash – ideal for functions with stringent hygienic necessities, such as aroma metering in the meals industry or additive dosing within the pharmaceutical business.
IE5+ PMSM permits cost discount and decentralized solutions

The sole limitation of the currently used PMSM is that it is only obtainable for secure areas. “Thanks to wide-range pace control with IE5+ PMSM, we will meet the growing buyer demands for a wider adjustment range and decrease power consumption, as well as total prices,” mentioned Wirkner to sum up the situation. “The subject of power effectivity specifically is becoming more and more essential for our customers. A decentralized resolution in which the frequency converter is put in immediately on the PMSM, can now be implemented with Getriebebau NORD GmbH & Co. KG, LEWA’s motor companion 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 main producer of metering pumps and process diaphragm pumps as nicely as full metering packages for process engineering. Headquartered in Leonberg, the company developed into an international group in just a few many years. Since 2022, the company has been part of the Atlas Copco Group, a globally leading Swedish manufacturer of compressors, vacuum options, generators, pumps, energy tools and assembly systems. Together with the model new owner, LEWA will additional broaden the commercial pumps business. As a analysis and manufacturing company, LEWA develops technologies and provides options for the huge array of functions among its prospects. Its products are used primarily within the chemical trade, the cosmetics trade, pharmaceuticals and biotechnology, food and beverage trade and energy utilities in addition to within the manufacturing of plastics, detergents and cleaners. Additional software areas include refineries and petrochemicals, the oil and fuel trade, and gasoline odorization. LEWA at present employs round 1,200 folks and owns 14 subsidiaries around the world alongside having 80 representatives and gross sales offices in additional than 80 countries.
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 feature a management vary of 1:200, enabling a wider vary of functions to be covered by the same drive or pump.
Source: LEWA GmbH

Image ID: Baby food.jpg

Caption: The PMSM also has a constant torque, i.e. the entire torque may be called up at pace zero rpm. This ensures significantly smooth and gentle system start-up, since each course of can be began with a conveyance price of 1 % as a substitute of the same old 10 %. (Example: Metering omega 3 fatty acids in the manufacturing of child food)

Source: Adobe Stock

Image ID: Torque.jpg

Caption: In contrast to the ASMs proven, the fixed torque of the PMSM permits continuous 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 standard frequency converter (NORD, Danfoss, and so forth.) with special parameterization, in order that customers can rely on common components.
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 by which the frequency converter is put in directly on the PMSM are also already potential with the PMSMs chosen 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 check bench. In the lower velocity vary above all, the PMSM efficiently demonstrated some nice benefits of constant torque: the ecodos test pump might be driven in a variety of 1:480 up to 5 bar.
Source: LEWA GmbH

More data for readers/viewers/interested events:

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 info 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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