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

In many purposes, metering components in the pharmaceutical or meals trade for instance, pumps are required that not only can be exactly controlled by way of move fee and dosing time, but additionally convey the components particularly gently. To enable the proven pump models of the ecodos sequence from LEWA GmbH to meet this demanding process with even more flexibility and energy efficiency in the future, the manufacturer is increasing the portfolio to incorporate a brand new form of wide-range pace control. Alongside เกจวัดแรงดันน้ำมันเครื่อง and servomotors, everlasting magnet synchronous motors, or PMSMs for brief, are also used now. They are characterised by excessive energy efficiency and a control range greater than 1:200. This considerably expands the vary of applications. With PMSMs, it’s now not necessary to make use of several pumps for different flow charges or oversize asynchronous motors for low speeds. Since PMSMs could be designed without a fan, they remain compact and straightforward to clean. The latter function predestines them for hygienic applications. High effectivity score over the whole management range in accordance with energy efficiency class IE5+ also reduces energy prices, thus making certain a decrease total value of ownership (TCO).
The diaphragm metering pumps within the LEWA ecodos collection are particularly properly fitted to purposes in 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 chrome steel with a floor roughness < 0.5 µm. This facilitates cleansing of the surfaces in contact with the product.
The motor technologies used so far have had to make sacrifices: “For basic asynchronous motors whose rotor is a squirrel-cage rotor, the control vary remains restricted to 1:10 (1:50 is possible in particular person cases). With encoder feedback, vital expansion is possible,” mentioned Maurice Wirkner, an utility manager at LEWA. “In addition, the drive is comparatively inefficient outdoors the rated speed range – particularly at low speeds. This requires the drive to be oversized, which increases operating costs.” Servomotors are optimized for extremely dynamic necessities and likewise cowl the whole control vary (1-210 pump strokes), nonetheless, they are dearer to purchase and in addition, require a servo inverter for control.
Wide-range speed management with everlasting magnet synchronous motor extends the vary of functions
LEWA has now expanded its personal portfolio with a drive know-how 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 defined. “Among different things, it features an extreme control vary, which regularly makes the utilization of a number of pumps for various circulate rates pointless.” Particularly within the case of a number of pumps, an additional handbook stroke adjustment or electric stroke adjustment can be allotted with and the required flow price could be realized by pace management solely. The PMSM additionally has a constant torque. The full torque can be utilized from engine velocity 0 rpm (standstill) as a lot as the rated velocity of the motor. This ensures particularly clean and delicate system start-up, since each process could be started with a pump capability of 1 % instead of the standard 10 percent.
It additionally features a high short-term overload capability, which enables a drive design with out oversizing for the beginning torque. As a outcome, smaller, extra cost-efficient sizes may be realized than with traditional drives. “Like the asynchronous motor, the PMSM may be controlled through a normal frequency converter, so customers can depend on widespread parts,” Wirkner explained. “With the servomotor quite the opposite, it will be needed to purchase costly servo controllers.” The compact drive may be simply cleaned as a result of its fanless design and offers high IP protection. If required a further conversion course of – referred to as nsd tupH – may be utilized to the aluminum physique for FDA requirements. This makes the floor extremely resistant and even easier to clean – best for applications with stringent hygienic requirements, similar to aroma metering within the meals business or additive dosing within the pharmaceutical industry.
IE5+ PMSM permits cost reduction and decentralized options
The sole limitation of the at present used PMSM is that it is only available for safe areas. “Thanks to wide-range pace control with IE5+ PMSM, we are ready to meet the increasing buyer demands for a wider adjustment range and lower energy consumption, as well as general prices,” said Wirkner to sum up the state of affairs. “The subject of vitality effectivity in particular is becoming more and more necessary for our customers. A decentralized solution in which the frequency converter is put in instantly on the PMSM, can now be applied 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 family business and is at present the world’s main manufacturer of metering pumps and course of diaphragm pumps as nicely as complete metering packages for process engineering. Headquartered in Leonberg, the corporate developed into a world group in only a few decades. Since 2022, the company has been a part of the Atlas Copco Group, a globally leading Swedish manufacturer of compressors, vacuum options, turbines, pumps, power tools and meeting methods. Together with the model new owner, LEWA will further broaden the commercial pumps business. As a analysis and manufacturing company, LEWA develops applied sciences and offers options for the vast array of functions among its clients. Its merchandise are used mainly in the chemical industry, the cosmetics trade, prescribed drugs and biotechnology, meals and beverage trade and vitality utilities in addition to in the production of plastics, detergents and cleaners. Additional software areas include refineries and petrochemicals, the oil and gas industry, and gas odorization. LEWA at present employs round 1,200 people and owns 14 subsidiaries all over the world alongside having 80 representatives and sales places of work in more 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 feature a control range of 1:200, enabling a wider vary of purposes to be covered by the same drive or pump.
Source: LEWA GmbH
Image ID: Baby meals.jpg
Caption: The PMSM also has a constant torque, i.e. all the torque may be known as up at velocity zero rpm. This ensures particularly clean and gentle system start-up, since each process can be began with a conveyance price of 1 p.c as an alternative of the usual 10 percent. (Example: Metering omega three fatty acids in 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 permits steady operation at low speeds. Oversizing for the required pump beginning torque has become unnecessary as a result of high overload capability of the PMSM.
Source: LEWA GmbH
Image ID: Baugrößen_530PWebJPG.jpg
Caption: Like the asynchronous motor, the PMSM could be controlled through a normal frequency converter (NORD, Danfoss, and so forth.) with special parameterization, so that customers can rely on common 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 solutions during which the frequency converter is put in immediately 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 check bench. In the lower pace range above all, the PMSM successfully demonstrated the advantages of constant torque: the ecodos take a look at pump could be driven in a spread of 1:480 up to 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 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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