In many functions, metering elements within the pharmaceutical or meals trade for example, pumps are required that not only can be precisely controlled when it comes to circulate fee and dosing time, but in addition convey the components particularly gently. To enable the confirmed pump models of the ecodos series from LEWA GmbH to fulfill this demanding activity with much more flexibility and vitality effectivity in the future, the producer is increasing the portfolio to include a brand new form of wide-range velocity management. Alongside asynchronous motors and servomotors, everlasting magnet synchronous motors, or PMSMs for short, are also used now. They are characterised by high energy effectivity and a management vary higher than 1:200. This significantly expands the vary of functions. With PMSMs, it’s no longer needed to make use of several pumps for various move rates or oversize asynchronous motors for low speeds. Since PMSMs could be designed with no fan, they remain compact and straightforward to scrub. The latter characteristic predestines them for hygienic purposes. High effectivity rating over the complete control range in accordance with power efficiency class IE5+ also reduces vitality prices, thus making certain a lower total price of possession (TCO).
The diaphragm metering pumps in the LEWA ecodos collection are significantly nicely suited to functions within the meals or pharmaceutical industries. All materials in touch with the fluids used in 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 from PP or electropolished stainless-steel with a surface roughness < 0.5 µm. This facilitates cleaning of the surfaces in contact with the product.
The motor applied sciences used to date have had to make sacrifices: “For traditional asynchronous motors whose rotor is a squirrel-cage rotor, the control range stays limited to 1:10 (1:50 is feasible in individual cases). With encoder suggestions, important expansion is feasible,” said Maurice Wirkner, an application supervisor at LEWA. “In addition, the drive is relatively inefficient exterior the rated pace vary – particularly at low speeds. This requires the drive to be oversized, which will increase operating prices.” Servomotors are optimized for extremely dynamic requirements and in addition cowl the whole control vary (1-210 pump strokes), nonetheless, they’re more expensive to purchase and as properly as, require a servo inverter for management.
Wide-range speed control with everlasting magnet synchronous motor extends the range of functions
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 permanent magnets and rotates synchronously, i.e. without load-dependent slip,” Wirkner defined. “Among other issues, it features an excessive control range, which frequently makes using multiple pumps for different flow charges unnecessary.” Particularly within the case of multiple pumps, a further guide stroke adjustment or electric stroke adjustment could be distributed with and the required flow price can be realized by pace control solely. The PMSM additionally has a relentless torque. The complete torque may be utilized from engine pace 0 rpm (standstill) as a lot as the rated pace of the motor. This ensures significantly clean and delicate system start-up, since every process can be started with a pump capability of 1 p.c instead of the usual 10 p.c.
It additionally features a excessive short-term overload capacity, which permits a drive design without oversizing for the starting torque. As a outcome, smaller, extra cost-efficient sizes may be realized than with traditional drives. “Like the asynchronous motor, the PMSM could be controlled by way of a standard frequency converter, so customers can rely on widespread elements,” Wirkner explained. “With the servomotor quite the opposite, it will be essential to buy costly servo controllers.” The compact drive may be easily cleaned due to its fanless design and offers high IP safety. If required a further conversion process – referred to as nsd tupH – may be utilized to the aluminum physique for FDA necessities. This makes the surface extremely resistant and even simpler to wash – ideal for functions with stringent hygienic requirements, similar to aroma metering within the meals trade or additive dosing within the pharmaceutical industry.
IE5+ PMSM enables price reduction and decentralized options
The sole limitation of the currently used PMSM is that it is just out there for protected areas. “Thanks to wide-range pace control with IE5+ PMSM, we are in a position to meet the rising buyer demands for a wider adjustment range and lower vitality consumption, in addition to overall prices,” said Wirkner to sum up the situation. “The matter of power effectivity particularly is becoming more and more essential for our clients. A decentralized solution by which the frequency converter is installed instantly 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 household business and is right now the world’s main producer of metering pumps and course of diaphragm pumps in addition to full metering packages for course of engineering. Headquartered in Leonberg, the company developed into an international group in just a few many years. Since 2022, the company has been part of the Atlas Copco Group, a globally leading Swedish producer of compressors, vacuum solutions, generators, pumps, power tools and assembly methods. Together with the new proprietor, LEWA will further increase the commercial pumps enterprise. As a analysis and manufacturing firm, LEWA develops technologies and supplies solutions for the vast array of applications amongst its prospects. Its merchandise are used primarily in the chemical business, the cosmetics trade, pharmaceuticals and biotechnology, food and beverage industry and energy utilities in addition to within the production of plastics, detergents and cleaners. Additional utility areas embrace refineries and petrochemicals, the oil and gasoline business, and gas odorization. LEWA at present employs around 1,200 folks and owns 14 subsidiaries around the world alongside having eighty representatives and sales workplaces in more than 80 international locations.
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 control range of 1:200, enabling a wider range of purposes to be covered by the same drive or pump.
Source: LEWA GmbH
Image ID: Baby food.jpg
Caption: The PMSM also has a constant torque, i.e. all of the torque may be known as up at pace zero rpm. This ensures notably clean and mild system start-up, since each course of could be began with a conveyance price of 1 p.c as a substitute of the usual 10 percent. (Example: Metering omega three fatty acids within the manufacturing of baby food)
Source: Adobe Stock
Image ID: Torque.jpg
Caption: In contrast to the ASMs proven, the fixed torque of the PMSM enables continuous operation at low speeds. Oversizing for the required pump beginning torque has turn out to be unnecessary as a outcome of excessive overload capability 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 regular frequency converter (NORD, Danfoss, etc.) with particular parameterization, so that users can rely 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 in which the frequency converter is installed directly on the PMSM are also already attainable with the PMSMs selected by LEWA.
differential pressure gauge ราคา : Getriebebau NORD GmbH & Co. KG
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Caption: As early as 2020, LEWA carried out initial useful testing with the NORD PMSM prototype and an ecodos pump on the pump test bench. In the decrease velocity range above all, the PMSM efficiently demonstrated some great advantages of fixed torque: the ecodos take a look at pump could be driven in a range of 1:480 up to 5 bar.
Source: LEWA GmbH
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