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

In many functions, metering components in the pharmaceutical or food industry for example, pumps are required that not only may be precisely controlled by method of move price and dosing time, but also convey the elements particularly gently. To allow the confirmed pump models of the ecodos series from LEWA GmbH to meet this demanding task with even more flexibility and vitality efficiency sooner or later, the manufacturer is increasing the portfolio to include a model new type of wide-range speed control. Alongside asynchronous motors and servomotors, everlasting magnet synchronous motors, or PMSMs for short, are additionally used now. They are characterised by excessive energy effectivity and a control vary higher than 1:200. This significantly expands the range of purposes. With PMSMs, it is now not needed to use a quantity of pumps for various circulate rates or oversize asynchronous motors for low speeds. Since PMSMs may be designed and not utilizing a fan, they continue to be compact and straightforward to wash. The latter feature predestines them for hygienic purposes. High efficiency ranking over the entire management range in accordance with vitality effectivity class IE5+ additionally reduces vitality prices, thus guaranteeing a decrease whole price of ownership (TCO).
The diaphragm metering pumps in the LEWA ecodos series are particularly well suited for applications within the meals or pharmaceutical industries. All materials in touch with the fluids used within the pump units meet the FDA and USP Class VI requirements, and the EU directives for the food business. In the hygienic model, for example, the pump head is made from PP or electropolished chrome steel with a floor roughness < 0.5 µm. This facilitates cleaning of the surfaces in contact with the product.
The motor technologies used to date have needed to make sacrifices: “For classic asynchronous motors whose rotor is a squirrel-cage rotor, the control vary stays restricted to 1:10 (1:50 is possible in individual cases). With เกจวัดแรงดันเชื้อเพลิง , vital expansion is possible,” mentioned Maurice Wirkner, an software supervisor at LEWA. “In addition, the drive is relatively inefficient outside the rated pace range – particularly at low speeds. This requires the drive to be outsized, which increases operating prices.” Servomotors are optimized for extremely dynamic requirements and also cowl the entire control vary (1-210 pump strokes), however, they are dearer to purchase and in addition, require a servo inverter for management.
Wide-range speed control with permanent magnet synchronous motor extends the range of functions
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. with out load-dependent slip,” Wirkner defined. “Among other issues, it options an extreme management range, which regularly makes the use of a number of pumps for different circulate rates pointless.” Particularly in the case of multiple pumps, an additional manual stroke adjustment or electric stroke adjustment may be distributed with and the required move price may be realized by velocity control only. The PMSM additionally has a constant torque. The complete torque can be utilized from engine speed 0 rpm (standstill) as much as the rated speed of the motor. This ensures notably easy and gentle system start-up, since each course of can be started with a pump capacity of 1 % instead of the identical old 10 %.
It also includes a high short-term overload capability, which permits a drive design without oversizing for the starting torque. As a result, smaller, extra cost-efficient sizes can be realized than with traditional drives. “Like the asynchronous motor, the PMSM can be controlled by way of a standard frequency converter, so customers can rely on frequent elements,” Wirkner defined. “With the servomotor on the contrary, it will be needed to purchase expensive servo controllers.” The compact drive can be easily cleaned due to its fanless design and presents high IP protection. If required a further conversion process – known as nsd tupH – may be utilized to the aluminum body for FDA necessities. This makes the floor extremely resistant and even easier to clean – ideal for purposes with stringent hygienic requirements, similar 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 at present used PMSM is that it’s only available for protected areas. “Thanks to wide-range speed management with IE5+ PMSM, we will meet the rising customer calls for for a wider adjustment range and decrease power consumption, in addition to general prices,” mentioned Wirkner to sum up the state of affairs. “The subject of energy effectivity particularly is changing into increasingly necessary for our clients. A decentralized answer by which the frequency converter is installed directly 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 household business and is at present the world’s main manufacturer of metering pumps and process diaphragm pumps as nicely as complete metering packages for course of engineering. Headquartered in Leonberg, the corporate developed into a global group in just a few decades. Since 2022, the company has been a half of the Atlas Copco Group, a globally main Swedish manufacturer of compressors, vacuum options, generators, pumps, energy instruments and assembly systems. Together with the new proprietor, LEWA will further expand the industrial pumps business. As a analysis and manufacturing company, LEWA develops applied sciences and provides solutions for the vast array of applications amongst its prospects. Its merchandise are used mainly within the chemical business, the cosmetics business, pharmaceuticals and biotechnology, meals and beverage business and vitality utilities in addition to in the production of plastics, detergents and cleaners. Additional software areas include refineries and petrochemicals, the oil and gasoline business, and gas odorization. LEWA at present employs around 1,200 folks and owns 14 subsidiaries all over the world alongside having eighty representatives and gross 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 feature a control vary of 1:200, enabling a wider vary of functions to be covered by the same drive or pump.
Source: LEWA GmbH
Image ID: Baby meals.jpg
Caption: The PMSM additionally has a constant torque, i.e. all of the torque can be referred to as up at velocity zero rpm. This ensures notably easy and delicate system start-up, since every process can be started with a conveyance fee of 1 p.c instead of the standard 10 p.c. (Example: Metering omega 3 fatty acids in the manufacturing of baby food)
Source: Adobe Stock
Image ID: Torque.jpg
Caption: In distinction to the ASMs shown, the constant torque of the PMSM permits steady operation at low speeds. Oversizing for the required pump starting torque has become pointless due to the high overload capability of the PMSM.
Source: LEWA GmbH
Image ID: Baugrößen_530PWebJPG.jpg
Caption: Like the asynchronous motor, the PMSM can be managed through a regular frequency converter (NORD, Danfoss, etc.) with special parameterization, in order that users can depend on common components.
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 selected by LEWA.
Source: Getriebebau NORD GmbH & Co. KG
Image ID: Functional testing.jpg
Caption: As early as 2020, LEWA carried out preliminary practical testing with the NORD PMSM prototype and an ecodos pump on the pump take a look at bench. In the lower velocity vary above all, the PMSM efficiently demonstrated the advantages of fixed torque: the ecodos test pump could probably be pushed in a range of 1:480 up to 5 bar.
Source: LEWA GmbH
More info 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
More data for members of the press
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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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