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

In many applications, metering elements within the pharmaceutical or food industry for instance, pumps are required that not solely may be exactly controlled in phrases of flow rate and dosing time, but additionally convey the ingredients particularly gently. To enable the proven pump items of the ecodos collection from LEWA GmbH to satisfy this demanding process with much more flexibility and vitality efficiency in the future, the producer is expanding the portfolio to incorporate a new type of wide-range velocity management. Alongside asynchronous motors and servomotors, everlasting magnet synchronous motors, or PMSMs for brief, are also used now. They are characterized by excessive power efficiency and a control vary greater than 1:200. This significantly expands the range of applications. With PMSMs, it is now not necessary to make use of several pumps for various circulate charges or oversize asynchronous motors for low speeds. Since ร้านซ่อมเครื่องวัดความดันโลหิต can be designed with no fan, they continue to be compact and easy to scrub. The latter characteristic predestines them for hygienic applications. High effectivity rating over the whole control vary in accordance with energy efficiency class IE5+ also reduces vitality prices, thus making certain a lower total price of ownership (TCO).
The diaphragm metering pumps in the LEWA ecodos collection are notably well fitted to purposes within the meals or pharmaceutical industries. All materials involved with the fluids used within the pump items meet the FDA and USP Class VI necessities, and the EU directives for the food business. In the hygienic model, for example, 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 technologies used thus far have needed to make sacrifices: “For classic asynchronous motors whose rotor is a squirrel-cage rotor, the management range stays restricted to 1:10 (1:50 is feasible in particular person cases). With encoder suggestions, important expansion is feasible,” said Maurice Wirkner, an utility supervisor at LEWA. “In addition, the drive is relatively inefficient outside the rated velocity vary – especially at low speeds. This requires the drive to be oversized, which increases operating costs.” Servomotors are optimized for highly dynamic necessities and in addition cover the entire management vary (1-210 pump strokes), nonetheless, they’re more expensive to purchase and as nicely as, require a servo inverter for management.
Wide-range speed control with permanent magnet synchronous motor extends the range of purposes
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 other things, it options an extreme control vary, which frequently makes using a quantity of pumps for different move charges pointless.” Particularly in the case of multiple pumps, a further guide stroke adjustment or electrical stroke adjustment could be dispensed with and the required flow price can be realized by velocity management solely. The PMSM additionally has a continuing torque. The complete torque may be utilized from engine velocity 0 rpm (standstill) as a lot as the rated velocity of the motor. This ensures significantly smooth and gentle system start-up, since each course of can be began with a pump capacity of 1 p.c as an alternative of the standard 10 %.
It additionally includes a high short-term overload capability, which permits a drive design with out oversizing for the starting torque. As a outcome, smaller, extra cost-efficient sizes may be realized than with classic drives. “Like the asynchronous motor, the PMSM could be managed through a regular frequency converter, so users can depend 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 simply cleaned because of its fanless design and presents high IP safety. If required a further conversion course of – referred to as nsd tupH – could be applied to the aluminum physique for FDA necessities. This makes the surface extraordinarily resistant and even easier to clean – best for purposes with stringent hygienic requirements, corresponding to aroma metering within the meals industry or additive dosing in the pharmaceutical business.
IE5+ PMSM allows price reduction and decentralized solutions
The sole limitation of the currently used PMSM is that it’s only out there for safe areas. “Thanks to wide-range speed control with IE5+ PMSM, we will meet the increasing customer calls for for a wider adjustment range and decrease vitality consumption, in addition to general costs,” mentioned Wirkner to sum up the state of affairs. “The subject of power efficiency in particular is becoming increasingly necessary for our clients. A decentralized resolution in which the frequency converter is installed directly 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 household business and is at present the world’s leading manufacturer of metering pumps and process diaphragm pumps as nicely as full metering packages for process engineering. Headquartered in Leonberg, the company developed into a world group in only a few a long time. Since 2022, the company has been a half of the Atlas Copco Group, a globally main Swedish producer of compressors, vacuum options, mills, pumps, energy tools and assembly methods. Together with the new owner, LEWA will further increase the industrial pumps business. As a research and manufacturing company, LEWA develops technologies and offers solutions for the huge array of functions amongst its customers. Its merchandise are used primarily within the chemical trade, the cosmetics business, prescription drugs and biotechnology, food and beverage business and power utilities in addition to in the manufacturing of plastics, detergents and cleaners. Additional utility areas embody refineries and petrochemicals, the oil and fuel trade, and fuel odorization. LEWA at present employs around 1,200 individuals and owns 14 subsidiaries around the world alongside having eighty representatives and gross sales offices in additional than 80 nations.
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 characteristic a management vary of 1:200, enabling a wider range of applications to be coated by the identical drive or pump.
Source: LEWA GmbH
Image ID: Baby food.jpg
Caption: The PMSM also has a relentless torque, i.e. all of the torque could be referred to as up at speed zero rpm. This ensures particularly smooth and gentle system start-up, since every process could be began with a conveyance rate of 1 % instead of the standard 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 proven, the fixed torque of the PMSM permits continuous operation at low speeds. Oversizing for the required pump starting torque has turn out to be pointless 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 managed via a standard frequency converter (NORD, Danfoss, and so forth.) with special parameterization, so that customers 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 in which the frequency converter is installed directly on the PMSM are also 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 practical testing with the NORD PMSM prototype and an ecodos pump on the pump take a look at bench. In the decrease pace vary above all, the PMSM efficiently demonstrated the advantages of fixed torque: the ecodos test pump could be driven in a spread of 1:480 as much as 5 bar.
Source: LEWA GmbH
More information 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 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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