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

In many applications, metering ingredients within the pharmaceutical or meals trade for instance, pumps are required that not only can be exactly managed when it comes to flow rate and dosing time, but in addition convey the ingredients notably gently. To allow the confirmed pump models of the ecodos collection from LEWA GmbH to satisfy this demanding task with much more flexibility and power efficiency in the future, the producer is expanding the portfolio to incorporate a brand new form of wide-range velocity control. Alongside asynchronous motors and servomotors, permanent magnet synchronous motors, or PMSMs for short, are additionally used now. They are characterized by excessive energy effectivity and a management range larger than 1:200. This considerably expands the range of functions. With PMSMs, it is no longer essential to use several pumps for different flow rates or oversize asynchronous motors for low speeds. Since PMSMs could be designed without a fan, they continue to be compact and straightforward to wash. The latter characteristic predestines them for hygienic applications. High effectivity rating over the whole management vary in accordance with vitality efficiency class IE5+ also reduces energy costs, thus making certain a decrease total price of ownership (TCO).
The diaphragm metering pumps in the LEWA ecodos sequence are particularly well fitted to purposes within the meals or pharmaceutical industries. All materials in touch with the fluids used within the pump models meet the FDA and USP Class VI necessities, and the EU directives for the meals trade. In the hygienic model, for instance, the pump head is made from PP or electropolished stainless steel with a surface roughness < 0.5 µm. This facilitates cleaning of the surfaces involved with the product.
The motor technologies used thus far 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 particular person cases). With encoder suggestions, vital enlargement is possible,” mentioned Maurice Wirkner, an application manager at LEWA. “In เครื่องมือที่ใช้วัดความดันเลือด , the drive is relatively inefficient outdoors the rated velocity range – particularly at low speeds. This requires the drive to be outsized, which will increase operating costs.” Servomotors are optimized for highly dynamic requirements and in addition cowl the complete management range (1-210 pump strokes), however, they are dearer to buy and in addition, require a servo inverter for control.
Wide-range speed control with everlasting magnet synchronous motor extends the vary of applications
LEWA has now expanded its personal 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. without load-dependent slip,” Wirkner defined. “Among เครื่องมือวัดความดัน , it options an excessive management range, which regularly makes the use of multiple pumps for different flow rates pointless.” Particularly in the case of multiple pumps, an additional handbook stroke adjustment or electrical stroke adjustment can be allotted with and the required move price may be realized by velocity management solely. The PMSM additionally has a relentless torque. The complete torque could be utilized from engine velocity zero rpm (standstill) as a lot as the rated speed of the motor. This ensures particularly easy and delicate system start-up, since every course of can be started with a pump capability of 1 p.c as a substitute of the same old 10 percent.
It additionally includes a high short-term overload capability, which enables a drive design without oversizing for the starting torque. As a result, smaller, more cost-efficient sizes can be realized than with classic drives. “Like the asynchronous motor, the PMSM may be controlled through a regular frequency converter, so users can depend on common components,” Wirkner defined. “With the servomotor quite the opposite, it might be needed to purchase costly servo controllers.” The compact drive may be simply cleaned as a result of its fanless design and presents high IP safety. If required an additional conversion course of – known as nsd tupH – can be utilized to the aluminum physique for FDA necessities. This makes the floor extremely resistant and even easier to clean – perfect for purposes with stringent hygienic necessities, such as aroma metering within the food business or additive dosing within the pharmaceutical business.
IE5+ PMSM allows price discount and decentralized options
The sole limitation of the currently used PMSM is that it is just out there for safe areas. “Thanks to wide-range velocity control with IE5+ PMSM, we will meet the growing customer calls for for a wider adjustment vary and lower power consumption, in addition to general costs,” stated Wirkner to sum up the scenario. “The subject of power efficiency particularly is becoming increasingly necessary for our clients. A decentralized solution by which the frequency converter is put in directly 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 business and is today the world’s main producer of metering pumps and course of diaphragm pumps as properly as complete metering packages for course of engineering. Headquartered in Leonberg, the corporate developed into a global group in just some many years. Since 2022, the company has been part of the Atlas Copco Group, a globally leading Swedish manufacturer of compressors, vacuum options, 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 firm, LEWA develops applied sciences and offers options for the huge array of applications amongst its prospects. Its merchandise are used mainly within the chemical industry, the cosmetics business, prescription drugs and biotechnology, meals and beverage industry and energy utilities as well as within the manufacturing of plastics, detergents and cleaners. Additional application areas embody refineries and petrochemicals, the oil and fuel business, and fuel odorization. LEWA currently employs around 1,200 folks and owns 14 subsidiaries around the globe alongside having 80 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 function a control range of 1:200, enabling a wider range of purposes to be covered by the identical drive or pump.
Source: LEWA GmbH
Image ID: Baby meals.jpg
Caption: The PMSM also has a constant torque, i.e. all the torque can be called up at velocity zero rpm. This ensures particularly clean and delicate system start-up, since each process could be started with a conveyance rate of 1 p.c as an alternative of the standard 10 percent. (Example: Metering omega three fatty acids within the manufacturing of baby food)
Source: Adobe Stock
Image ID: Torque.jpg
Caption: In distinction to the ASMs shown, the fixed torque of the PMSM enables continuous operation at low speeds. Oversizing for the required pump starting torque has become unnecessary because of the high overload functionality of the PMSM.
Source: LEWA GmbH
Image ID: Baugrößen_530PWebJPG.jpg
Caption: Like the asynchronous motor, the PMSM may be managed by way of a standard frequency converter (NORD, Danfoss, and so forth.) with special parameterization, so that users can rely 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 by 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 preliminary useful testing with the NORD PMSM prototype and an ecodos pump on the pump check bench. In the decrease pace vary above all, the PMSM successfully demonstrated the benefits of fixed torque: the ecodos take a look at pump could presumably be pushed in a variety of 1:480 up to 5 bar.
Source: LEWA GmbH
More info for readers/viewers/interested parties:
LEWA GmbH
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 info 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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