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

In many purposes, metering components in the pharmaceutical or food trade for instance, pumps are required that not only could be precisely managed when it comes to move price and dosing time, but in addition convey the ingredients particularly gently. To enable the confirmed pump units of the ecodos series from LEWA GmbH to meet this demanding process with even more flexibility and vitality effectivity sooner or later, the manufacturer is expanding the portfolio to include a new type 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 power effectivity and a control vary higher than 1:200. This significantly expands the range of purposes. With PMSMs, it’s no longer essential to make use of several pumps for different flow charges or oversize asynchronous motors for low speeds. Since PMSMs may be designed without a fan, they proceed to be compact and easy to wash. The latter function predestines them for hygienic functions. High efficiency score over the whole management vary in accordance with energy efficiency class IE5+ also reduces power costs, thus making certain a lower whole cost of ownership (TCO).
The diaphragm metering pumps within the LEWA ecodos series are notably well fitted to applications in the food 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 food industry. In the hygienic version, for example, the pump head is made of PP or electropolished chrome steel with a floor roughness < zero.5 µm. This facilitates cleansing of the surfaces involved with the product.
The motor technologies used so far have needed to make sacrifices: “For basic asynchronous motors whose rotor is a squirrel-cage rotor, the control range 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 outdoors the rated speed range – particularly at low speeds. This requires the drive to be oversized, which will increase operating costs.” Servomotors are optimized for highly dynamic requirements and also cover 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 pace control with permanent magnet synchronous motor extends the vary of purposes
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 everlasting magnets and rotates synchronously, i.e. without load-dependent slip,” Wirkner defined. “Among other issues, it options an excessive control vary, which regularly makes the usage of a number of pumps for different flow rates unnecessary.” Particularly within the case of multiple pumps, a further guide stroke adjustment or electric stroke adjustment could be dispensed with and the required flow price can be realized by pace management only. The PMSM additionally has a continuing torque. The full torque can be applied from engine velocity zero rpm (standstill) as a lot as the rated velocity of the motor. This ensures notably smooth and delicate system start-up, since each course of can be started with a pump capacity of 1 % instead of the usual 10 p.c.
It additionally includes a high short-term overload capability, which allows a drive design with out oversizing for the beginning torque. As a result, smaller, more cost-efficient sizes may be realized than with basic drives. “Like the asynchronous motor, the PMSM can be managed through a regular frequency converter, so customers can depend on common components,” Wirkner explained. “With the servomotor on the contrary, it would be essential to buy expensive servo controllers.” The compact drive may be simply cleaned because of its fanless design and presents excessive IP protection. If required an extra conversion course of – known as nsd tupH – may be applied to the aluminum physique for FDA requirements. This makes the floor extraordinarily resistant and even simpler to clean – perfect for purposes with stringent hygienic necessities, such as aroma metering in the meals trade or additive dosing in the pharmaceutical trade.
IE5+ PMSM allows price discount and decentralized options
The sole limitation of the at present used PMSM is that it is only obtainable for safe areas. “Thanks to wide-range pace control with IE5+ PMSM, we will meet the growing buyer calls for for a wider adjustment range and lower vitality consumption, as nicely as general prices,” said Wirkner to sum up the situation. “The topic of energy effectivity particularly is turning into more and more essential for our prospects. A decentralized answer in which the frequency converter is put in directly on the PMSM, can now be carried out with Getriebebau NORD GmbH & Co. KG, LEWA’s motor companion for PMSM, too.”
LEWA GmbH was based in 1952 by Herbert Ott and Rudolf Schestag as a family enterprise and is today the world’s leading producer of metering pumps and process diaphragm pumps as properly as complete metering packages for process engineering. Headquartered in Leonberg, the company developed into a world group in only a few many years. Since 2022, the company has been a half of the Atlas Copco Group, a globally main Swedish manufacturer of compressors, vacuum solutions, mills, pumps, energy tools and meeting methods. Together with เกจวัดแรงดันถังลม , LEWA will further expand the industrial pumps enterprise. As a research and manufacturing company, LEWA develops applied sciences and supplies solutions for the vast array of functions amongst its prospects. Its merchandise are used mainly in the chemical business, the cosmetics trade, pharmaceuticals and biotechnology, meals and beverage industry and power utilities in addition to within the production of plastics, detergents and cleaners. Additional application areas embrace refineries and petrochemicals, the oil and gasoline trade, and gas odorization. LEWA at present employs around 1,200 people and owns 14 subsidiaries around the globe alongside having eighty representatives and sales workplaces in more than 80 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 function a control vary of 1:200, enabling a wider range of functions to be lined by the same drive or pump.
Source: LEWA GmbH
Image ID: Baby meals.jpg
Caption: The PMSM also has a continuing torque, i.e. all the torque may be known as up at velocity 0 rpm. This ensures particularly clean and mild system start-up, since every process could be started with a conveyance rate of 1 % as a substitute of the standard 10 percent. (Example: Metering omega three fatty acids in the manufacturing of child food)
Source: Adobe Stock
Image ID: Torque.jpg
Caption: In distinction to the ASMs shown, the constant torque of the PMSM allows continuous operation at low speeds. Oversizing for the required pump starting torque has become unnecessary 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 normal frequency converter (NORD, Danfoss, and so on.) with particular parameterization, so that customers 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 options during which the frequency converter is installed immediately on the PMSM are also already potential with the PMSMs chosen by LEWA.
Source: Getriebebau NORD GmbH & Co. KG
Image ID: Functional testing.jpg
Caption: As early as 2020, LEWA carried out initial functional testing with the NORD PMSM prototype and an ecodos pump on the pump test bench. In the decrease pace vary above all, the PMSM successfully demonstrated the advantages of fixed torque: the ecodos check pump might be driven in a range 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 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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