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

In many purposes, metering elements in the pharmaceutical or meals business for instance, pumps are required that not solely may be precisely controlled by method of move rate and dosing time, but in addition convey the components particularly gently. To allow the proven pump models of the ecodos series from LEWA GmbH to fulfill this demanding task with much more flexibility and power efficiency sooner or later, the producer is expanding the portfolio to include a new type of wide-range pace control. Alongside asynchronous motors and servomotors, everlasting magnet synchronous motors, or PMSMs for brief, are additionally used now. They are characterised by excessive vitality efficiency and a control vary larger than 1:200. This considerably expands the vary of purposes. With PMSMs, it’s not needed to make use of a quantity of pumps for different flow charges or oversize asynchronous motors for low speeds. Since pressure gauge ออก หลัง can be designed without a fan, they remain compact and simple to wash. The latter function predestines them for hygienic purposes. High efficiency rating over the whole management range in accordance with energy efficiency class IE5+ also reduces energy prices, thus making certain a lower whole price of ownership (TCO).
The diaphragm metering pumps within the LEWA ecodos collection are particularly properly suited for purposes in the food or pharmaceutical industries. All materials involved with the fluids used in the pump units meet the FDA and USP Class VI requirements, and the EU directives for the meals trade. In the hygienic model, for example, the pump head is manufactured from PP or electropolished stainless steel with a floor roughness < 0.5 µm. This facilitates cleaning of the surfaces in touch with the product.
The motor applied sciences used thus far have needed to make sacrifices: “For traditional 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, vital enlargement is feasible,” said Maurice Wirkner, an software supervisor at LEWA. “In addition, the drive is relatively inefficient outdoors the rated pace vary – especially at low speeds. This requires the drive to be outsized, which will increase operating costs.” Servomotors are optimized for extremely dynamic requirements and also cowl the complete control range (1-210 pump strokes), nonetheless, they are costlier to purchase and as properly as, require a servo inverter for management.
Wide-range velocity control with everlasting magnet synchronous motor extends the range of functions

LEWA has now expanded its own portfolio with a drive know-how that does not 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 different things, it options an extreme management range, which frequently makes the utilization of multiple pumps for different circulate rates pointless.” Particularly in the case of a number of pumps, an extra manual stroke adjustment or electrical stroke adjustment may be allotted with and the required circulate price could be realized by pace control only. The PMSM also has a relentless torque. The complete torque can be utilized from engine speed 0 rpm (standstill) as a lot as the rated velocity of the motor. This ensures particularly smooth and gentle system start-up, since each course of may be began with a pump capacity of 1 p.c as a substitute of the usual 10 percent.
It additionally contains a high short-term overload capacity, which permits a drive design without oversizing for the starting torque. As a result, smaller, more cost-efficient sizes could be realized than with basic drives. “Like the asynchronous motor, the PMSM can be controlled by way of a normal frequency converter, so customers can rely on common elements,” Wirkner explained. “With the servomotor on the contrary, it would be necessary to buy expensive servo controllers.” The compact drive could be simply cleaned because of its fanless design and offers excessive IP protection. If required a further conversion course of – known as nsd tupH – could be utilized to the aluminum physique for FDA necessities. This makes the floor extremely resistant and even easier to clean – ideal for functions with stringent hygienic necessities, such as aroma metering in the food trade or additive dosing in the pharmaceutical business.
IE5+ PMSM allows cost discount and decentralized solutions

The sole limitation of the currently used PMSM is that it’s only out there for secure areas. “Thanks to wide-range speed control with IE5+ PMSM, we will meet the increasing buyer demands for a wider adjustment range and decrease vitality consumption, as properly as overall costs,” stated Wirkner to sum up the situation. “The topic of energy efficiency particularly is turning into increasingly necessary for our prospects. A decentralized resolution in which the frequency converter is put in directly 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 right now the world’s leading producer of metering pumps and process diaphragm pumps as well as complete metering packages for course of engineering. Headquartered in Leonberg, the corporate developed into a world group in only a few a long time. Since 2022, the corporate has been part of the Atlas Copco Group, a globally leading Swedish producer of compressors, vacuum options, turbines, pumps, power instruments and meeting methods. Together with the new owner, LEWA will additional increase the economic pumps enterprise. As a research and manufacturing firm, LEWA develops applied sciences and supplies options for the huge array of applications among its customers. Its products are used mainly in the chemical business, the cosmetics trade, prescription drugs and biotechnology, food and beverage business and vitality utilities in addition to in the manufacturing of plastics, detergents and cleaners. Additional software areas embody refineries and petrochemicals, the oil and gas trade, and gas odorization. LEWA at present employs round 1,200 folks and owns 14 subsidiaries all over the world alongside having 80 representatives and sales workplaces in additional than eighty nations.
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 feature a management range of 1:200, enabling a wider vary of applications to be coated by the same drive or pump.
Source: LEWA GmbH

Image ID: Baby food.jpg

Caption: The PMSM also has a relentless torque, i.e. all of the torque could be known as up at velocity zero rpm. This ensures significantly easy and delicate system start-up, since every course of can be began with a conveyance fee of 1 % as a substitute of the identical old 10 %. (Example: Metering omega three fatty acids in the production of child food)

Source: Adobe Stock

Image ID: Torque.jpg

Caption: In contrast to the ASMs proven, the constant torque of the PMSM permits steady operation at low speeds. Oversizing for the required pump beginning torque has become unnecessary due to 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 via a standard frequency converter (NORD, Danfoss, and so forth.) with particular parameterization, so that users can depend on widespread 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 solutions during which the frequency converter is installed instantly on the PMSM are also already attainable 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 initial practical testing with the NORD PMSM prototype and an ecodos pump on the pump test bench. In the lower pace range above all, the PMSM successfully demonstrated the benefits of constant torque: the ecodos test pump could be driven in a spread of 1:480 as a lot as 5 bar.
Source: LEWA GmbH

More information for readers/viewers/interested parties:

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

Email: lewa@lewa.de

Internet: www.lewa.de

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

Email: info@abopr.de

Internet: www.abopr.de


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