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

In many applications, metering ingredients in the pharmaceutical or meals industry for example, pumps are required that not only could be precisely controlled when it comes to flow fee and dosing time, but also convey the components notably gently. To enable the confirmed pump models of the ecodos series from LEWA GmbH to fulfill this demanding activity with much more flexibility and vitality effectivity sooner or later, the manufacturer is increasing the portfolio to incorporate a new type of wide-range pace control. Alongside asynchronous motors and servomotors, permanent magnet synchronous motors, or PMSMs for brief, are additionally used now. They are characterised by excessive power efficiency and a control range larger than 1:200. This significantly expands the vary of applications. With PMSMs, it is no longer necessary to make use of a number 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 easy to clean. The latter function predestines them for hygienic purposes. High efficiency score over the entire management vary in accordance with vitality effectivity class IE5+ also reduces power costs, thus guaranteeing a decrease total cost of ownership (TCO).
The diaphragm metering pumps within the LEWA ecodos sequence are particularly nicely fitted to purposes within the meals or pharmaceutical industries. All materials involved with the fluids used in the pump items meet the FDA and USP Class VI requirements, and the EU directives for the meals trade. In the hygienic version, for example, the pump head is manufactured from PP or electropolished stainless-steel with a floor roughness < 0.5 µm. This facilitates cleansing of the surfaces in contact 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 range remains limited to 1:10 (1:50 is feasible in particular person cases). With encoder feedback, vital enlargement is possible,” mentioned Maurice Wirkner, an software supervisor at LEWA. “In addition, the drive is comparatively inefficient outside the rated speed vary – especially at low speeds. This requires the drive to be oversized, which will increase working prices.” Servomotors are optimized for highly dynamic requirements and likewise cowl the entire management range (1-210 pump strokes), however, they’re more expensive to buy and in addition, require a servo inverter for management.
Wide-range velocity control with permanent magnet synchronous motor extends the vary of applications
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 permanent magnets and rotates synchronously, i.e. with out load-dependent slip,” Wirkner explained. “Among different things, it options an excessive management range, which often makes the usage of multiple pumps for different move charges unnecessary.” Particularly in the case of a quantity of pumps, an additional handbook stroke adjustment or electric stroke adjustment may be distributed with and the required circulate rate can be realized by speed management only. The PMSM additionally has a relentless torque. The full torque could be applied from engine speed zero rpm (standstill) up to the rated velocity of the motor. This ensures significantly easy and delicate system start-up, since each course of can be began with a pump capacity of 1 p.c as a substitute of the similar old 10 p.c.
It also contains a high short-term overload capacity, which permits a drive design without oversizing for the starting torque. As a outcome, smaller, more cost-efficient sizes can be realized than with classic drives. “Like the asynchronous motor, the PMSM may be controlled by way of a standard frequency converter, so customers can depend on widespread elements,” Wirkner explained. “With the servomotor on the contrary, it would be necessary to purchase expensive servo controllers.” The compact drive may be simply cleaned due to its fanless design and provides excessive IP protection. If required an additional conversion course of – known as nsd tupH – could be applied to the aluminum body for FDA requirements. This makes the floor extraordinarily resistant and even easier to scrub – ideal for applications with stringent hygienic necessities, such as aroma metering in the meals industry or additive dosing in the pharmaceutical business.
IE5+ PMSM permits cost reduction and decentralized options
The sole limitation of the presently used PMSM is that it is only obtainable for safe areas. “Thanks to wide-range pace control with IE5+ PMSM, we can meet the rising customer demands for a wider adjustment range and lower vitality consumption, as well as general costs,” stated Wirkner to sum up the scenario. “The topic of vitality effectivity particularly is turning into increasingly important for our customers. A decentralized resolution during which the frequency converter is installed instantly 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 business and is at present the world’s main manufacturer of metering pumps and process diaphragm pumps as nicely as full metering packages for process engineering. เกจวัดแรงดัน1บาร์ in Leonberg, the corporate developed into a global group in just a few decades. Since 2022, the company has been a half of the Atlas Copco Group, a globally main Swedish producer of compressors, vacuum options, mills, pumps, power instruments and assembly systems. Together with the new proprietor, LEWA will further expand the commercial pumps enterprise. As a analysis and manufacturing firm, LEWA develops technologies and provides solutions for the vast array of functions among its prospects. Its merchandise are used mainly in the chemical industry, the cosmetics business, prescribed drugs and biotechnology, food and beverage trade and power utilities as nicely as within the manufacturing of plastics, detergents and cleaners. Additional utility areas include refineries and petrochemicals, the oil and gasoline trade, and fuel odorization. LEWA presently employs round 1,200 people and owns 14 subsidiaries all over the world alongside having 80 representatives and sales places of work 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 function a control range of 1:200, enabling a wider range of functions to be covered by the identical drive or pump.
Source: LEWA GmbH
Image ID: Baby meals.jpg
Caption: The PMSM additionally has a relentless torque, i.e. the entire torque may be referred to as up at velocity 0 rpm. This ensures significantly clean and gentle system start-up, since each course of could be began with a conveyance price of 1 % instead of the usual 10 p.c. (Example: Metering omega three fatty acids within the production of baby food)
Source: Adobe Stock
Image ID: Torque.jpg
Caption: In distinction to the ASMs shown, the constant torque of the PMSM allows steady operation at low speeds. Oversizing for the required pump beginning torque has turn out to be unnecessary because of the high overload capability of the PMSM.
Source: LEWA GmbH
Image ID: Baugrößen_530PWebJPG.jpg
Caption: Like the asynchronous motor, the PMSM can be managed by way of a standard frequency converter (NORD, Danfoss, etc.) with special parameterization, in order 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 options during which the frequency converter is installed immediately on the PMSM are additionally 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 practical testing with the NORD PMSM prototype and an ecodos pump on the pump test bench. In the lower velocity range above all, the PMSM successfully demonstrated the advantages of fixed torque: the ecodos check pump could possibly be pushed in a spread of 1:480 as a lot as 5 bar.
Source: LEWA GmbH
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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