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

In many applications, metering components in the pharmaceutical or food trade for instance, pumps are required that not only could be precisely controlled in terms of move rate and dosing time, but in addition convey the components significantly gently. To enable the confirmed pump units of the ecodos sequence from LEWA GmbH to fulfill this demanding activity with even more flexibility and energy effectivity in the future, the manufacturer is expanding the portfolio to incorporate a new type of wide-range pace management. Alongside asynchronous motors and servomotors, permanent magnet synchronous motors, or PMSMs for short, are additionally used now. They are characterised by high energy effectivity and a control range larger than 1:200. This considerably expands the range of functions. With PMSMs, it’s now not necessary to make use of a quantity of pumps for various flow rates or oversize asynchronous motors for low speeds. Since PMSMs could be designed without a fan, they proceed to be compact and easy to clean. The latter function predestines them for hygienic purposes. High effectivity rating over the complete control vary in accordance with vitality efficiency class IE5+ also reduces energy costs, thus guaranteeing a lower whole value of ownership (TCO).
The diaphragm metering pumps in the LEWA ecodos series are particularly well suited to functions within the food or pharmaceutical industries. All supplies involved with the fluids used in the pump units meet the FDA and USP Class VI requirements, and the EU directives for the food industry. In the hygienic version, for instance, the pump head is made of PP or electropolished stainless steel with a surface roughness < zero.5 µm. This facilitates cleansing of the surfaces in touch with the product.
The motor technologies used thus far have had to make sacrifices: “For traditional asynchronous motors whose rotor is a squirrel-cage rotor, the management vary stays limited to 1:10 (1:50 is possible in particular person cases). With encoder feedback, significant enlargement is feasible,” said Maurice Wirkner, an utility manager at LEWA. “In addition, the drive is comparatively inefficient outside the rated pace vary – particularly at low speeds. This requires the drive to be oversized, which will increase operating costs.” เครื่องมือที่ใช้วัดความดันโลหิต are optimized for extremely dynamic requirements and in addition cowl the entire management vary (1-210 pump strokes), nonetheless, they’re costlier to purchase and as nicely as, require a servo inverter for control.
Wide-range pace control with everlasting magnet synchronous motor extends the vary of applications
LEWA has now expanded its personal portfolio with a drive expertise 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 issues, it features an excessive management vary, which frequently makes the usage of a quantity of pumps for different move charges unnecessary.” Particularly within the case of a number of pumps, an extra guide stroke adjustment or electrical stroke adjustment could be distributed with and the required circulate price may be realized by pace control only. The PMSM additionally has a constant torque. The full torque could be utilized from engine pace zero rpm (standstill) as a lot as the rated speed of the motor. This ensures notably clean and mild system start-up, since every process can be started with a pump capacity of 1 % instead of the standard 10 percent.
It additionally features a excessive short-term overload capability, which allows a drive design with out 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 can be managed through a regular frequency converter, so users can rely on common components,” Wirkner explained. “With the servomotor quite the opposite, it would be necessary to purchase expensive servo controllers.” The compact drive could be simply cleaned as a outcome of its fanless design and offers high IP protection. If required an additional conversion process – known as nsd tupH – could be utilized to the aluminum body for FDA requirements. This makes the floor extraordinarily resistant and even simpler to wash – best for applications with stringent hygienic necessities, corresponding to aroma metering in the meals industry or additive dosing within the pharmaceutical business.
IE5+ PMSM permits value reduction and decentralized options
The sole limitation of the presently used PMSM is that it is just available for secure areas. “Thanks to wide-range pace control with IE5+ PMSM, we can meet the growing buyer calls for for a wider adjustment range and lower power consumption, as well as general prices,” stated Wirkner to sum up the scenario. “The topic of vitality effectivity in particular is turning into more and more essential for our prospects. A decentralized resolution in which the frequency converter is installed instantly on the PMSM, can now be carried out 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 right now the world’s main producer of metering pumps and process diaphragm pumps as nicely as full metering packages for course of engineering. Headquartered in Leonberg, the company developed into a global group in just some many years. Since 2022, the corporate has been part of the Atlas Copco Group, a globally main Swedish producer of compressors, vacuum options, generators, pumps, power instruments and assembly methods. Together with the model new proprietor, LEWA will additional broaden the industrial pumps enterprise. As a analysis and manufacturing company, LEWA develops applied sciences and offers solutions for the vast array of applications among its customers. Its merchandise are used mainly within the chemical trade, the cosmetics trade, prescription drugs and biotechnology, meals and beverage business and power utilities as well as within the manufacturing of plastics, detergents and cleaners. Additional utility areas embrace refineries and petrochemicals, the oil and gasoline business, and gasoline odorization. LEWA currently employs round 1,200 folks and owns 14 subsidiaries around the globe alongside having 80 representatives and gross sales workplaces in more than eighty countries.
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 range of 1:200, enabling a wider range of functions to be lined by the identical drive or pump.
Source: LEWA GmbH
Image ID: Baby meals.jpg
Caption: The PMSM additionally has a continuing torque, i.e. the entire torque could be called up at pace 0 rpm. This ensures significantly easy and gentle system start-up, since every course of could be began with a conveyance fee of 1 p.c as a substitute of the standard 10 %. (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 constant torque of the PMSM permits continuous operation at low speeds. Oversizing for the required pump starting torque has become pointless as a result of high 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 regular frequency converter (NORD, Danfoss, and so on.) with particular parameterization, so 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 directly on the PMSM are additionally already potential 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 preliminary functional 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 successfully demonstrated the advantages of constant torque: the ecodos check pump could possibly be pushed in a spread of 1:480 as a lot as 5 bar.
Source: LEWA GmbH
More information for readers/viewers/interested parties:
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Phone: +49 7152 14-0, Fax: +49 7152 14-1303
Email: lewa@lewa.de
Internet: www.lewa.de
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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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