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

In many purposes, metering components in the pharmaceutical or food trade for instance, pumps are required that not only can be precisely managed in phrases of move price and dosing time, but additionally convey the components particularly gently. To allow the proven pump models of the ecodos series from LEWA GmbH to fulfill this demanding task with even more flexibility and power effectivity in the future, the manufacturer is expanding the portfolio to include a new form of wide-range speed management. Alongside asynchronous motors and servomotors, permanent magnet synchronous motors, or PMSMs for brief, are additionally used now. They are characterized by high vitality effectivity and a management range larger than 1:200. This significantly expands the vary of purposes. With PMSMs, it is not essential to make use of several pumps for various circulate rates or oversize asynchronous motors for low speeds. Since PMSMs may be designed and not using a fan, they remain compact and easy to wash. The latter function predestines them for hygienic purposes. High efficiency rating over the complete management vary in accordance with power effectivity class IE5+ additionally reduces energy prices, thus guaranteeing a lower complete cost of possession (TCO).
The diaphragm metering pumps in the LEWA ecodos collection are particularly properly suited to purposes within the meals or pharmaceutical industries. เกจวัดแรงดันเบนซิน in contact with the fluids used in the pump items meet the FDA and USP Class VI necessities, and the EU directives for the meals business. In the hygienic model, for example, the pump head is made 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 so far have had to make sacrifices: “For traditional asynchronous motors whose rotor is a squirrel-cage rotor, the management vary remains restricted to 1:10 (1:50 is possible in particular person cases). With encoder feedback, significant expansion is feasible,” said Maurice Wirkner, an utility supervisor at LEWA. “In addition, the drive is comparatively inefficient outdoors the rated pace vary – particularly at low speeds. This requires the drive to be outsized, which will increase working prices.” Servomotors are optimized for highly dynamic requirements and also cover the whole control vary (1-210 pump strokes), however, they’re costlier to purchase and as properly as, require a servo inverter for control.
Wide-range speed control with everlasting magnet synchronous motor extends the range of applications
LEWA has now expanded its own portfolio with a drive expertise that doesn’t have these weaknesses. “Unlike the asynchronous motor, the rotor of this drive consists of permanent magnets and rotates synchronously, i.e. without load-dependent slip,” Wirkner defined. “Among other things, it options an excessive control vary, which regularly makes the use of a number of pumps for various flow charges unnecessary.” Particularly within the case of a number of pumps, an additional handbook stroke adjustment or electric stroke adjustment may be allotted with and the required move fee could be realized by speed control solely. The PMSM also has a continuing torque. The complete torque could be applied from engine velocity 0 rpm (standstill) as a lot as the rated velocity of the motor. This ensures notably clean and mild system start-up, since each process could be started with a pump capability of 1 percent as a substitute of the identical old 10 percent.
It additionally contains a excessive short-term overload capability, which permits a drive design without oversizing for the starting torque. As a end result, smaller, extra cost-efficient sizes could be realized than with traditional drives. “Like the asynchronous motor, the PMSM can be managed through a normal frequency converter, so users can depend on widespread elements,” Wirkner defined. “With the servomotor quite the opposite, it would be essential to purchase expensive servo controllers.” The compact drive can be simply cleaned due to its fanless design and presents excessive IP protection. If required an extra conversion process – known as nsd tupH – could be utilized to the aluminum body for FDA requirements. This makes the surface extremely resistant and even easier to scrub – best for applications with stringent hygienic requirements, similar to aroma metering in the meals trade or additive dosing in the pharmaceutical trade.
IE5+ PMSM enables price discount and decentralized options
The sole limitation of the currently used PMSM is that it is only available for secure areas. “Thanks to wide-range speed management with IE5+ PMSM, we are ready to meet the rising buyer demands for a wider adjustment vary and lower power consumption, as well as general costs,” stated Wirkner to sum up the situation. “The topic of power effectivity in particular is turning into increasingly necessary for our prospects. A decentralized solution during which the frequency converter is installed immediately on the PMSM, can now be carried out 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 right now the world’s main producer of metering pumps and course of diaphragm pumps in addition to full metering packages for course of engineering. Headquartered in Leonberg, the corporate developed into a world group in just some many years. Since 2022, the corporate has been a part of the Atlas Copco Group, a globally leading Swedish producer of compressors, vacuum solutions, turbines, pumps, power tools and meeting techniques. Together with the model new proprietor, LEWA will further broaden the industrial pumps enterprise. As a research and manufacturing company, LEWA develops technologies and supplies options for the vast array of purposes among its prospects. Its merchandise are used primarily in the chemical trade, the cosmetics industry, prescribed drugs and biotechnology, meals and beverage trade and energy utilities as properly as in the production of plastics, detergents and cleaners. Additional utility areas embrace refineries and petrochemicals, the oil and fuel business, and gasoline odorization. LEWA at present employs round 1,200 individuals and owns 14 subsidiaries around the globe alongside having eighty representatives and gross sales places of work in additional than 80 international locations.
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 function a management vary of 1:200, enabling a wider vary of applications to be lined by the same drive or pump.
Source: LEWA GmbH
Image ID: Baby food.jpg
Caption: The PMSM additionally has a continuing torque, i.e. the entire torque could be referred to as up at velocity zero rpm. This ensures significantly smooth and mild system start-up, since each course of may be started with a conveyance rate of 1 percent as a substitute of the usual 10 p.c. (Example: Metering omega three fatty acids within 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 allows steady operation at low speeds. Oversizing for the required pump beginning torque has become 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 may be managed through a standard frequency converter (NORD, Danfoss, etc.) with special parameterization, in order that users can depend on frequent 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 in which the frequency converter is installed directly on the PMSM are also already attainable 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 practical testing with the NORD PMSM prototype and an ecodos pump on the pump test bench. In the decrease pace vary above all, the PMSM efficiently demonstrated the advantages of constant torque: the ecodos test pump could be pushed in a range of 1:480 up to 5 bar.
Source: LEWA GmbH
More info 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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