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

In many applications, metering elements in the pharmaceutical or meals business for example, pumps are required that not solely may be precisely controlled in phrases of circulate price and dosing time, but additionally convey the components notably gently. To allow the confirmed pump models of the ecodos sequence from LEWA GmbH to fulfill this demanding activity with much more flexibility and vitality efficiency in the future, the producer is increasing the portfolio to incorporate a model new type of wide-range velocity control. Alongside asynchronous motors and servomotors, permanent magnet synchronous motors, or PMSMs for short, are also used now. They are characterised by excessive vitality effectivity and a management range greater than 1:200. This significantly expands the vary of applications. With PMSMs, it is not needed to make use of a number of pumps for various move charges or oversize asynchronous motors for low speeds. Since PMSMs could be designed without a fan, they remain compact and straightforward to scrub. The latter feature predestines them for hygienic functions. High effectivity ranking over the whole control vary in accordance with energy effectivity class IE5+ also reduces energy prices, thus ensuring a decrease whole cost of possession (TCO).
The diaphragm metering pumps within the LEWA ecodos collection are notably properly suited for purposes in the food or pharmaceutical industries. All supplies in touch with the fluids used in the pump units meet the FDA and USP Class VI requirements, and the EU directives for the meals trade. In the hygienic version, for instance, the pump head is made from PP or electropolished stainless steel with a surface roughness < 0.5 µm. This facilitates cleansing of the surfaces in touch with the product.
The motor applied sciences used to date have needed to make sacrifices: “For basic asynchronous motors whose rotor is a squirrel-cage rotor, the control vary remains limited to 1:10 (1:50 is feasible in individual cases). With encoder feedback, vital growth is feasible,” stated Maurice Wirkner, an utility manager at LEWA. “In addition, the drive is relatively inefficient exterior the rated speed vary – particularly at low speeds. This requires the drive to be outsized, which will increase working costs.” Servomotors are optimized for highly dynamic requirements and also cowl the complete control vary (1-210 pump strokes), nonetheless, they’re dearer to purchase and as properly as, require a servo inverter for management.
Wide-range pace management with everlasting magnet synchronous motor extends the vary of functions
LEWA has now expanded its personal 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. with out load-dependent slip,” Wirkner explained. “Among other issues, it options an excessive management range, which often makes the utilization of a quantity of pumps for different move charges pointless.” Particularly within เครื่องวัดแรงดันเกจที่นิยมใช้ of a number of pumps, a further guide stroke adjustment or electrical stroke adjustment can be distributed with and the required flow price could be realized by speed control only. The PMSM additionally has a continuing torque. The complete torque could be applied from engine velocity zero rpm (standstill) up to the rated speed of the motor. This ensures notably easy and delicate system start-up, since every process could be started with a pump capability of 1 % as a substitute of the usual 10 percent.
It also contains a excessive short-term overload capacity, which permits a drive design with out oversizing for the beginning torque. As a result, smaller, more cost-efficient sizes could be realized than with classic drives. “Like the asynchronous motor, the PMSM could be managed via a regular frequency converter, so customers can depend on frequent parts,” Wirkner explained. “With the servomotor on the contrary, it would be essential to buy expensive servo controllers.” The compact drive could be simply cleaned because of its fanless design and provides high IP safety. If required an extra conversion course of – called nsd tupH – could be utilized to the aluminum body for FDA requirements. This makes the surface extremely resistant and even easier to clean – perfect for applications with stringent hygienic necessities, similar to aroma metering in the meals industry or additive dosing within the pharmaceutical business.
IE5+ PMSM enables cost discount and decentralized options
The sole limitation of the presently used PMSM is that it’s only available for protected areas. “Thanks to wide-range pace control with IE5+ PMSM, we will meet the increasing buyer demands for a wider adjustment vary and lower power consumption, in addition to total prices,” mentioned Wirkner to sum up the scenario. “The subject of vitality effectivity particularly is changing into increasingly important for our prospects. A decentralized answer by which the frequency converter is installed instantly on the PMSM, can now be applied with Getriebebau NORD GmbH & Co. KG, LEWA’s motor partner for PMSM, too.”
LEWA GmbH was based in 1952 by Herbert Ott and Rudolf Schestag as a family business and is at present 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 an international group in just some a long time. Since 2022, the corporate has been a half of the Atlas Copco Group, a globally leading Swedish producer of compressors, vacuum solutions, turbines, pumps, energy tools and assembly methods. Together with the new proprietor, LEWA will further increase the commercial pumps business. As a research and manufacturing company, LEWA develops applied sciences and provides solutions for the huge array of functions among its customers. Its merchandise are used primarily within the chemical trade, the cosmetics industry, prescribed drugs and biotechnology, meals and beverage industry and energy utilities in addition to within the manufacturing of plastics, detergents and cleaners. Additional utility areas embody refineries and petrochemicals, the oil and gas trade, and fuel odorization. LEWA at present employs round 1,200 people and owns 14 subsidiaries all over the world alongside having 80 representatives and gross sales places of work in more than eighty 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 vary of 1:200, enabling a wider range of purposes to be lined by the identical drive or pump.
Source: LEWA GmbH
Image ID: Baby food.jpg
Caption: The PMSM also has a constant torque, i.e. all of the torque could be called up at speed zero rpm. This ensures notably clean and gentle system start-up, since every process can be began with a conveyance rate of 1 % as a substitute of the usual 10 percent. (Example: Metering omega 3 fatty acids within the production of baby food)
Source: Adobe Stock
Image ID: Torque.jpg
Caption: In distinction to the ASMs shown, the fixed torque of the PMSM permits steady operation at low speeds. Oversizing for the required pump starting torque has turn into 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 controlled through a regular frequency converter (NORD, Danfoss, and so on.) with particular parameterization, in order that users can depend 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 installed immediately 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 test bench. In the decrease speed vary above all, the PMSM efficiently demonstrated some great advantages of fixed torque: the ecodos check pump could probably be pushed in a spread of 1:480 as a lot as 5 bar.
Source: LEWA GmbH
More data 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 information 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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