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

In many purposes, metering components within the pharmaceutical or meals business for instance, pumps are required that not only may be exactly controlled by means of move rate and dosing time, but also convey the components notably gently. To allow the confirmed pump units of the ecodos sequence from LEWA GmbH to meet this demanding activity with even more flexibility and energy effectivity in the future, the manufacturer is expanding the portfolio to incorporate a model new form of wide-range velocity management. Alongside asynchronous motors and servomotors, permanent magnet synchronous motors, or PMSMs for brief, are also used now. They are characterized by excessive vitality efficiency and a management range larger than 1:200. This significantly expands the vary of purposes. With PMSMs, it is not needed to use several pumps for various flow charges or oversize asynchronous motors for low speeds. Since PMSMs may be designed and not using a fan, they proceed to be compact and easy to clean. The latter characteristic predestines them for hygienic purposes. High effectivity ranking over the complete management range in accordance with energy effectivity class IE5+ also reduces power prices, thus guaranteeing a lower whole cost of possession (TCO).
The diaphragm metering pumps in the LEWA ecodos collection are significantly well suited to functions within the food or pharmaceutical industries. All materials in contact with the fluids used in the pump items meet the FDA and USP Class VI necessities, and the EU directives for the food business. In the hygienic model, for instance, the pump head is made of PP or electropolished stainless steel with a floor roughness < zero.5 µm. This facilitates cleansing of the surfaces in touch with the product.
The motor applied sciences used so far have needed to make sacrifices: “For classic asynchronous motors whose rotor is a squirrel-cage rotor, the management vary stays restricted to 1:10 (1:50 is possible in individual cases). With encoder feedback, important expansion is feasible,” stated Maurice Wirkner, an utility manager at LEWA. “In addition, the drive is relatively inefficient outdoors the rated velocity vary – especially at low speeds. This requires the drive to be outsized, which increases operating prices.” Servomotors are optimized for highly dynamic necessities and likewise cover the entire control range (1-210 pump strokes), nevertheless, they are costlier to buy and in addition, require a servo inverter for control.
Wide-range velocity control with permanent magnet synchronous motor extends the vary of purposes
LEWA has now expanded its own portfolio with a drive know-how that does not have these weaknesses. “Unlike the asynchronous motor, the rotor of this drive consists of everlasting magnets and rotates synchronously, i.e. with out load-dependent slip,” Wirkner explained. “Among different things, it features an extreme control vary, which frequently makes using multiple pumps for various circulate rates unnecessary.” Particularly within the case of a number of pumps, an additional manual stroke adjustment or electrical stroke adjustment may be allotted with and the required flow price may be realized by pace control solely. The PMSM also has a constant torque. The complete torque may be utilized from engine pace zero rpm (standstill) up to the rated velocity of the motor. This ensures significantly clean and delicate system start-up, since every process can be began with a pump capability of 1 % as a substitute of the usual 10 %.
It additionally includes a high short-term overload capability, which enables a drive design with out oversizing for the beginning torque. As a end result, smaller, more cost-efficient sizes may be realized than with basic drives. “Like the asynchronous motor, the PMSM can be controlled by way of a standard frequency converter, so customers can depend on frequent parts,” Wirkner explained. “With เกจวัดแรงดันสูญญากาศ quite the opposite, it might be essential to purchase costly servo controllers.” The compact drive may be easily cleaned because of its fanless design and offers high IP safety. If required a further conversion process – known as nsd tupH – can be applied to the aluminum physique for FDA necessities. This makes the floor extremely resistant and even easier to wash – best for purposes with stringent hygienic requirements, corresponding to aroma metering in the food industry or additive dosing within the pharmaceutical industry.
IE5+ PMSM permits price discount and decentralized solutions
The sole limitation of the presently used PMSM is that it’s only available for safe areas. “Thanks to wide-range pace management with IE5+ PMSM, we can meet the growing buyer calls for for a wider adjustment range and lower vitality consumption, in addition to overall prices,” stated Wirkner to sum up the situation. “The topic of vitality efficiency specifically is changing into increasingly important for our clients. A decentralized answer by which the frequency converter is put in immediately on the PMSM, can now be carried out 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 enterprise and is right now the world’s main manufacturer of metering pumps and process diaphragm pumps as nicely as full metering packages for process engineering. Headquartered in Leonberg, the corporate developed into an international group in just some many years. Since 2022, the corporate has been part of the Atlas Copco Group, a globally leading Swedish manufacturer of compressors, vacuum options, mills, pumps, energy instruments and assembly techniques. Together with the new owner, LEWA will additional increase the economic pumps enterprise. As a analysis and manufacturing company, LEWA develops applied sciences and offers solutions for the huge array of functions amongst its clients. Its merchandise are used primarily in the chemical industry, the cosmetics trade, prescription drugs and biotechnology, food and beverage trade and vitality utilities as nicely as in the production of plastics, detergents and cleaners. Additional application areas embrace refineries and petrochemicals, the oil and fuel trade, and gasoline odorization. LEWA currently employs around 1,200 people and owns 14 subsidiaries around the world alongside having 80 representatives and sales offices 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 coated by the identical drive or pump.
Source: LEWA GmbH
Image ID: Baby food.jpg
Caption: The PMSM also has a continuing torque, i.e. all the torque could be called up at pace 0 rpm. This ensures significantly smooth and mild system start-up, since each process may be started with a conveyance rate of 1 p.c as a substitute of the identical old 10 %. (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 enables continuous operation at low speeds. Oversizing for the required pump beginning torque has turn out to be pointless as a end result of high overload functionality of the PMSM.
Source: LEWA GmbH
Image ID: Baugrößen_530PWebJPG.jpg
Caption: Like the asynchronous motor, the PMSM could be controlled via a standard frequency converter (NORD, Danfoss, and so forth.) with particular parameterization, so that customers can rely on frequent 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 in which the frequency converter is put in directly on the PMSM are also already possible 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 practical 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 constant torque: the ecodos check pump might be pushed in a range of 1:480 up to 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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