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

In many purposes, metering ingredients within the pharmaceutical or food industry for example, pumps are required that not solely may be precisely controlled when it comes to flow rate and dosing time, but in addition convey the components significantly gently. To allow the confirmed pump units of the ecodos collection from LEWA GmbH to fulfill this demanding activity with even more flexibility and energy efficiency sooner or later, the manufacturer is expanding the portfolio to include a model new form 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 high vitality efficiency and a control vary larger than 1:200. This significantly expands the vary of purposes. With PMSMs, it’s now not necessary to use several pumps for different circulate rates or oversize asynchronous motors for low speeds. Since PMSMs may be designed without a fan, they proceed to be compact and simple to wash. The latter function predestines them for hygienic functions. High efficiency score over the entire management range in accordance with power effectivity class IE5+ also reduces vitality costs, thus guaranteeing a decrease total price of ownership (TCO).
The diaphragm metering pumps within the LEWA ecodos series are notably properly fitted to applications in the food or pharmaceutical industries. เกจวัดแรงดันปั๊มลมpuma involved with the fluids used within the pump units 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 stainless steel with a floor roughness < 0.5 µm. This facilitates cleaning of the surfaces involved with the product.
The motor technologies used so far have had to make sacrifices: “For basic asynchronous motors whose rotor is a squirrel-cage rotor, the control vary stays limited to 1:10 (1:50 is feasible in individual cases). With encoder feedback, important expansion is feasible,” mentioned Maurice Wirkner, an application supervisor at LEWA. “In addition, the drive is comparatively inefficient exterior the rated velocity vary – particularly at low speeds. This requires the drive to be outsized, which will increase working costs.” Servomotors are optimized for highly dynamic requirements and likewise cowl the entire management range (1-210 pump strokes), however, they’re costlier to buy and in addition, require a servo inverter for management.
Wide-range speed management with permanent magnet synchronous motor extends the vary of applications
LEWA has now expanded its own portfolio with a drive technology 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 explained. “Among other issues, it options an extreme management vary, which frequently makes the usage of multiple pumps for various flow charges unnecessary.” Particularly in the case of multiple pumps, a further handbook stroke adjustment or electrical stroke adjustment can be dispensed with and the required move rate could be realized by velocity control only. The PMSM also has a continuing torque. The complete torque could be applied from engine speed zero rpm (standstill) up to the rated pace of the motor. This ensures particularly smooth and gentle system start-up, since every process could be started with a pump capability of 1 % as a substitute of the standard 10 %.
It additionally features a high short-term overload capability, which permits a drive design with out oversizing for the starting torque. As a result, smaller, more cost-efficient sizes can be realized than with basic drives. “Like the asynchronous motor, the PMSM can be controlled through a normal frequency converter, so users can depend on frequent components,” Wirkner defined. “With the servomotor quite the opposite, it might be necessary to buy expensive servo controllers.” The compact drive may be easily cleaned because of its fanless design and offers high IP safety. If required an additional conversion process – known as nsd tupH – can be utilized to the aluminum body for FDA requirements. This makes the surface extraordinarily resistant and even simpler to clean – perfect for functions with stringent hygienic requirements, corresponding to aroma metering within the meals business or additive dosing in the pharmaceutical industry.
IE5+ PMSM enables value discount and decentralized options
The sole limitation of the presently used PMSM is that it is just out there for secure areas. “Thanks to wide-range speed control with IE5+ PMSM, we will meet the growing customer demands for a wider adjustment vary and lower energy consumption, in addition to total costs,” mentioned Wirkner to sum up the scenario. “The matter of power effectivity in particular is turning into more and more important for our customers. A decentralized solution in which the frequency converter is put in immediately on the PMSM, can now be applied with Getriebebau NORD GmbH & Co. KG, LEWA’s motor companion for PMSM, too.”
LEWA GmbH was founded in 1952 by Herbert Ott and Rudolf Schestag as a household enterprise and is at present the world’s leading manufacturer of metering pumps and course of diaphragm pumps in addition to complete metering packages for course of engineering. Headquartered in Leonberg, the corporate developed into a world group in just some many years. Since 2022, the corporate has been a half of the Atlas Copco Group, a globally main Swedish producer of compressors, vacuum options, mills, pumps, power tools and assembly systems. Together with the new owner, LEWA will additional increase the commercial pumps enterprise. As a analysis and manufacturing firm, LEWA develops applied sciences and offers options for the huge array of functions amongst its prospects. Its products are used primarily in the chemical business, the cosmetics trade, prescription drugs and biotechnology, meals and beverage trade and energy utilities as properly as in the production of plastics, detergents and cleaners. Additional utility areas include refineries and petrochemicals, the oil and gas business, and gasoline odorization. LEWA at present employs round 1,200 folks and owns 14 subsidiaries around the world alongside having eighty representatives and gross sales places of work in additional 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 characteristic a management vary of 1:200, enabling a wider vary 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 can be referred to as up at pace 0 rpm. This ensures notably smooth and mild system start-up, since every process can be started with a conveyance fee of 1 percent as an alternative of the similar old 10 %. (Example: Metering omega three fatty acids within 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 starting torque has turn into unnecessary 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 may be managed by way of a standard frequency converter (NORD, Danfoss, etc.) 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 options in which the frequency converter is put in instantly on the PMSM are additionally already attainable 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 range above all, the PMSM successfully demonstrated the benefits of fixed torque: the ecodos take a look at pump could probably be driven in a spread 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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