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

In many functions, metering components in the pharmaceutical or meals industry for example, pumps are required that not solely can be precisely controlled when it comes to flow rate and dosing time, but additionally convey the ingredients significantly gently. To allow the proven pump units of the ecodos sequence from LEWA GmbH to fulfill this demanding activity with even more flexibility and power efficiency sooner or later, the producer 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 short, are also used now. They are characterized by high energy effectivity and a control vary larger than 1:200. This significantly expands the range of functions. With PMSMs, it is no longer necessary to use several pumps for different circulate charges or oversize asynchronous motors for low speeds. Since PMSMs may be designed and not utilizing a fan, they remain compact and simple to clean. The latter feature predestines them for hygienic functions. High effectivity score over the entire control vary in accordance with energy efficiency class IE5+ also reduces energy costs, thus guaranteeing a lower total cost of possession (TCO).
The diaphragm metering pumps in the LEWA ecodos series are particularly nicely fitted to applications within the meals or pharmaceutical industries. All supplies in touch with the fluids used in the pump items meet the FDA and USP Class VI requirements, and the EU directives for the meals business. In the hygienic version, for example, the pump head is made from PP or electropolished chrome steel with a floor roughness < zero.5 µm. This facilitates cleaning of the surfaces involved with the product.
The motor applied sciences used to date have needed to make sacrifices: “For classic asynchronous motors whose rotor is a squirrel-cage rotor, the management range remains restricted to 1:10 (1:50 is possible in individual cases). With encoder suggestions, significant growth is feasible,” stated Maurice Wirkner, an utility manager at LEWA. “In addition, the drive is comparatively inefficient exterior the rated velocity vary – particularly at low speeds. This requires the drive to be oversized, which will increase working costs.” Servomotors are optimized for extremely dynamic requirements and in addition cowl the whole management vary (1-210 pump strokes), nevertheless, they are dearer to buy and as well as, require a servo inverter for management.
Wide-range pace control with permanent magnet synchronous motor extends the vary of purposes
LEWA has now expanded its own portfolio with a drive technology 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 explained. “Among other issues, it options an extreme management vary, which often makes using multiple pumps for various circulate rates pointless.” Particularly within the case of a number of pumps, an additional manual stroke adjustment or electric stroke adjustment can be allotted with and the required move fee could be realized by speed management solely. The PMSM also has a constant torque. The complete torque may be utilized from engine speed 0 rpm (standstill) as much as the rated pace of the motor. This ensures notably smooth and mild system start-up, since every process could be started with a pump capacity of 1 % instead of the usual 10 %.
It additionally features a high short-term overload capacity, which permits a drive design without oversizing for the beginning torque. As a outcome, smaller, extra cost-efficient sizes can be realized than with basic drives. “Like the asynchronous motor, the PMSM may be managed by way of a normal frequency converter, so users can rely on widespread components,” Wirkner explained. “With the servomotor on the contrary, it will be necessary to purchase expensive servo controllers.” The compact drive can be easily cleaned because of its fanless design and offers high IP protection. If required an extra conversion course of – called nsd tupH – may be utilized to the aluminum body for FDA requirements. This makes the floor extremely resistant and even simpler to clean – ideal for applications with stringent hygienic requirements, similar to aroma metering within the food trade or additive dosing in the pharmaceutical business.
IE5+ PMSM permits value reduction and decentralized options
The sole limitation of the presently used PMSM is that it is just obtainable for protected areas. “Thanks to wide-range pace control with IE5+ PMSM, we are in a position to meet the growing buyer calls for for a wider adjustment range and decrease vitality consumption, as properly as general prices,” said Wirkner to sum up the situation. “The matter of energy efficiency specifically is changing into more and more essential for our customers. A decentralized solution by which the frequency converter is put in immediately on the PMSM, can now be implemented 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 today the world’s main producer of metering pumps and course of diaphragm pumps as properly as complete metering packages for process engineering. Headquartered in Leonberg, the company developed into an international group in just some a long time. 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 brand new proprietor, LEWA will additional broaden the economic pumps enterprise. As เกจวัดแรงดันลม10bar and manufacturing company, LEWA develops applied sciences and provides solutions for the vast array of applications amongst its clients. Its products are used mainly within the chemical trade, the cosmetics business, pharmaceuticals and biotechnology, food and beverage industry and power utilities in addition to in the manufacturing of plastics, detergents and cleaners. Additional application areas embrace refineries and petrochemicals, the oil and fuel industry, and fuel odorization. LEWA currently employs around 1,200 people and owns 14 subsidiaries around the globe alongside having eighty representatives and sales offices in more 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 control range of 1:200, enabling a wider range of purposes to be lined by the same drive or pump.
Source: LEWA GmbH
Image ID: Baby food.jpg
Caption: The PMSM also has a relentless torque, i.e. the entire torque may be called up at speed zero rpm. This ensures significantly smooth and mild system start-up, since every course of may be began with a conveyance rate of 1 percent as an alternative of the standard 10 %. (Example: Metering omega 3 fatty acids in the production of baby food)
Source: Adobe Stock
Image ID: Torque.jpg
Caption: In contrast to the ASMs proven, the fixed torque of the PMSM allows continuous operation at low speeds. Oversizing for the required pump beginning torque has turn out to be unnecessary because of the excessive overload functionality of the PMSM.
Source: LEWA GmbH
Image ID: Baugrößen_530PWebJPG.jpg
Caption: Like the asynchronous motor, the PMSM can be controlled via a standard frequency converter (NORD, Danfoss, etc.) with special parameterization, so that customers can depend on widespread 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 installed instantly 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 initial useful testing with the NORD PMSM prototype and an ecodos pump on the pump check bench. In the lower pace vary above all, the PMSM successfully demonstrated the advantages of constant torque: the ecodos check pump might be driven in a variety of 1:480 up to 5 bar.
Source: LEWA GmbH
More info 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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