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

In many applications, metering ingredients in the pharmaceutical or meals business for instance, pumps are required that not solely may be precisely controlled when it comes to circulate rate and dosing time, but also convey the components particularly gently. To allow the proven pump models of the ecodos sequence from LEWA GmbH to meet this demanding activity with even more flexibility and energy effectivity sooner or later, the manufacturer is expanding the portfolio to include a model new type of wide-range pace management. Alongside asynchronous motors and servomotors, everlasting magnet synchronous motors, or PMSMs for short, are additionally used now. They are characterized by high energy effectivity and a management range greater than 1:200. This considerably expands the vary of applications. With PMSMs, it’s not essential to use a quantity of pumps for various flow rates or oversize asynchronous motors for low speeds. Since PMSMs can be designed and not utilizing a fan, they remain compact and simple to wash. The latter characteristic predestines them for hygienic purposes. High efficiency ranking over the complete management range in accordance with vitality efficiency class IE5+ also reduces vitality costs, thus making certain a lower whole value of possession (TCO).
The diaphragm metering pumps in the LEWA ecodos sequence are notably properly suited for functions within the food or pharmaceutical industries. All supplies involved with the fluids used within the pump items meet the FDA and USP Class VI necessities, and the EU directives for the food industry. In the hygienic model, for example, the pump head is made of PP or electropolished stainless-steel with a floor roughness < zero.5 µm. This facilitates cleansing of the surfaces in contact with the product.
The motor technologies used to date have needed to make sacrifices: “For basic asynchronous motors whose rotor is a squirrel-cage rotor, the control vary stays restricted to 1:10 (1:50 is possible in particular person cases). With encoder feedback, important enlargement is feasible,” mentioned Maurice Wirkner, an software supervisor at LEWA. “In addition, the drive is comparatively inefficient outdoors the rated speed range – particularly at low speeds. This requires the drive to be outsized, which will increase working prices.” Servomotors are optimized for extremely dynamic requirements and also cover the whole control range (1-210 pump strokes), however, they are costlier to buy and in addition, require a servo inverter for management.
Wide-range pace control with permanent magnet synchronous motor extends the vary of applications
LEWA has now expanded its own portfolio with a drive expertise 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 explained. “Among different issues, it features an extreme management vary, which often makes using a number of pumps for different move charges unnecessary.” Particularly within the case of multiple pumps, an additional guide stroke adjustment or electrical stroke adjustment may be distributed with and the required move fee could be realized by pace management solely. The PMSM additionally has a relentless torque. The full torque may be applied from engine speed 0 rpm (standstill) as a lot as the rated speed of the motor. This ensures significantly clean and delicate system start-up, since each process could be began with a pump capacity of 1 p.c as a substitute of the standard 10 p.c.
It additionally contains a excessive short-term overload capacity, which allows a drive design without oversizing for the starting torque. As a end result, smaller, extra cost-efficient sizes may be realized than with basic drives. “Like the asynchronous motor, the PMSM could be managed through a normal frequency converter, so customers can depend on common parts,” Wirkner explained. “With the servomotor on the contrary, it would be necessary to buy costly servo controllers.” The compact drive can be simply cleaned as a end result of its fanless design and offers high IP safety. If required an extra conversion course of – called nsd tupH – can be utilized to the aluminum physique 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 trade or additive dosing within the pharmaceutical industry.
IE5+ PMSM permits value reduction and decentralized solutions
The sole limitation of the at present used PMSM is that it is only obtainable for secure areas. “Thanks to wide-range speed management with IE5+ PMSM, we will meet the growing customer calls for for a wider adjustment range and decrease energy consumption, as properly as general costs,” said Wirkner to sum up the state of affairs. “The topic of power effectivity in particular is becoming increasingly necessary for our clients. pressure gauge แบบ น้ำมัน decentralized solution by which the frequency converter is installed immediately on the PMSM, can now be applied with Getriebebau NORD GmbH & Co. KG, LEWA’s motor partner 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 producer of metering pumps and course of diaphragm pumps in addition to full metering packages for course of engineering. Headquartered in Leonberg, the company developed into an international group in only a few many years. Since 2022, the corporate has been part of the Atlas Copco Group, a globally leading Swedish manufacturer of compressors, vacuum options, mills, pumps, energy tools and assembly techniques. Together with the model new proprietor, LEWA will further broaden the economic pumps enterprise. As a research and manufacturing firm, LEWA develops applied sciences and supplies solutions for the vast array of purposes among its prospects. Its products are used mainly in the chemical industry, the cosmetics trade, prescription drugs and biotechnology, meals and beverage industry and vitality utilities as nicely as within the manufacturing of plastics, detergents and cleaners. Additional software areas embody refineries and petrochemicals, the oil and fuel trade, and fuel odorization. LEWA presently employs around 1,200 folks and owns 14 subsidiaries around the globe alongside having eighty representatives and sales offices in more 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 characteristic a management vary of 1:200, enabling a wider vary of applications 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 can be known as up at pace 0 rpm. This ensures particularly smooth and mild system start-up, since each course of could be started with a conveyance price of 1 percent instead of the similar old 10 %. (Example: Metering omega three fatty acids within the production of baby food)
Source: Adobe Stock
Image ID: Torque.jpg
Caption: In contrast to the ASMs shown, the constant torque of the PMSM allows steady operation at low speeds. Oversizing for the required pump starting torque has become pointless as a end result of 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 regular frequency converter (NORD, Danfoss, and so on.) with special parameterization, so that users can rely on frequent 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 solutions by which the frequency converter is put in directly 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 practical testing with the NORD PMSM prototype and an ecodos pump on the pump check bench. In the lower speed vary above all, the PMSM successfully demonstrated the benefits of fixed torque: the ecodos take a look at pump could possibly be driven in a range of 1:480 as much as 5 bar.
Source: LEWA GmbH
More information for readers/viewers/interested parties:
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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