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

In many applications, metering ingredients within the pharmaceutical or meals trade for example, pumps are required that not solely can be precisely controlled by means of move fee and dosing time, but also convey the elements notably gently. To allow the confirmed pump items of the ecodos sequence from LEWA GmbH to meet this demanding activity with even more flexibility and energy effectivity in the future, the manufacturer is expanding the portfolio to include a new type of wide-range velocity management. Alongside asynchronous motors and servomotors, everlasting magnet synchronous motors, or PMSMs for brief, are additionally used now. They are characterized by excessive energy effectivity and a control range greater than 1:200. This considerably expands the vary of applications. With PMSMs, it is not necessary to make use of a number of pumps for various circulate charges or oversize asynchronous motors for low speeds. Since PMSMs can be designed and not using a fan, they remain compact and easy to wash. The latter characteristic predestines them for hygienic purposes. High efficiency ranking over the entire management vary in accordance with vitality effectivity class IE5+ also reduces energy costs, thus guaranteeing a decrease whole price of possession (TCO).
The diaphragm metering pumps in the LEWA ecodos series are notably well suited to purposes within the meals or pharmaceutical industries. All supplies involved with the fluids used in the pump models 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 manufactured from PP or electropolished stainless steel with a surface roughness < zero.5 µm. This facilitates cleansing of the surfaces in contact with the product.
The motor technologies used so far have needed to make sacrifices: “For basic asynchronous motors whose rotor is a squirrel-cage rotor, the control vary remains limited to 1:10 (1:50 is feasible in particular person cases). With encoder suggestions, significant enlargement is possible,” said Maurice Wirkner, an utility manager at LEWA. “In addition, the drive is relatively inefficient outside the rated velocity range – particularly at low speeds. This requires the drive to be outsized, which will increase working prices.” ไดอะแฟรม ซีล are optimized for highly dynamic necessities and also cover the whole control vary (1-210 pump strokes), however, they’re costlier to purchase and as well as, require a servo inverter for management.
Wide-range pace control with permanent magnet synchronous motor extends the range of applications

LEWA has now expanded its own portfolio with a drive technology that doesn’t 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 explained. “Among other things, it options an excessive control vary, which frequently makes using a quantity of pumps for various circulate rates unnecessary.” Particularly within the case of multiple pumps, an additional handbook stroke adjustment or electrical stroke adjustment can be dispensed with and the required flow price can be realized by velocity management solely. The PMSM also has a constant torque. The complete torque can be utilized from engine velocity 0 rpm (standstill) as much as the rated velocity of the motor. This ensures notably easy and gentle system start-up, since every course of can be started with a pump capability of 1 % as an alternative of the standard 10 p.c.
It also contains a excessive short-term overload capability, which permits a drive design with out oversizing for the beginning torque. As a result, smaller, more cost-efficient sizes can be realized than with basic drives. “Like the asynchronous motor, the PMSM may be controlled through a standard frequency converter, so users can depend on widespread parts,” Wirkner explained. “With ไดอะแฟรม ซีล quite the opposite, it might be essential to purchase costly servo controllers.” The compact drive may be simply cleaned because of its fanless design and offers excessive IP safety. If required an additional conversion course of – referred to as nsd tupH – can be utilized to the aluminum body for FDA requirements. This makes the floor extremely resistant and even easier to wash – best for purposes with stringent hygienic necessities, corresponding to aroma metering in the meals business or additive dosing within the pharmaceutical trade.
IE5+ PMSM allows price reduction and decentralized solutions

The sole limitation of the at present used PMSM is that it is only obtainable for safe areas. “Thanks to wide-range velocity management with IE5+ PMSM, we can meet the increasing customer demands for a wider adjustment vary and decrease energy consumption, in addition to overall costs,” mentioned Wirkner to sum up the scenario. “The topic of energy efficiency specifically is becoming more and more important for our clients. A decentralized resolution during which the frequency converter is installed immediately on the PMSM, can now be implemented with Getriebebau NORD GmbH & Co. KG, LEWA’s motor partner for PMSM, too.”

LEWA GmbH was based in 1952 by Herbert Ott and Rudolf Schestag as a household business and is right now the world’s main 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 world group in only a few many years. Since 2022, the corporate has been a half of the Atlas Copco Group, a globally leading Swedish producer of compressors, vacuum options, generators, pumps, energy tools and meeting techniques. Together with the brand new proprietor, LEWA will additional increase the industrial pumps business. As a analysis and manufacturing firm, LEWA develops technologies and supplies options for the huge array of applications among its clients. Its products are used primarily in the chemical trade, the cosmetics trade, prescription drugs and biotechnology, food and beverage business and power utilities as nicely as in the manufacturing of plastics, detergents and cleaners. Additional software areas embody refineries and petrochemicals, the oil and fuel business, and gasoline odorization. LEWA currently employs around 1,200 people and owns 14 subsidiaries around the globe alongside having eighty representatives and sales offices in additional than 80 countries.
Image materials:
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 characteristic a management range of 1:200, enabling a wider range of functions to be covered by the same drive or pump.
Source: LEWA GmbH

Image ID: Baby meals.jpg

Caption: The PMSM also has a continuing torque, i.e. all the torque may be referred to as up at pace 0 rpm. This ensures notably smooth and mild system start-up, since each course of can be began with a conveyance fee of 1 p.c as a substitute of the similar old 10 %. (Example: Metering omega three fatty acids in the production 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 out to be pointless because of the high overload capability of the PMSM.
Source: LEWA GmbH

Image ID: Baugrößen_530PWebJPG.jpg

Caption: Like the asynchronous motor, the PMSM could be managed by way of a regular frequency converter (NORD, Danfoss, and so on.) with special parameterization, in order that users can rely on widespread parts.
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 during which the frequency converter is installed directly on the PMSM are additionally already potential 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 initial functional testing with the NORD PMSM prototype and an ecodos pump on the pump take a look at bench. In the decrease speed range above all, the PMSM successfully demonstrated some nice benefits of fixed torque: the ecodos take a look at pump could be pushed in a spread of 1:480 as a lot as 5 bar.
Source: LEWA GmbH

More information 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 data 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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