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LEWA ecodos LED3 with PMSM (Source: LEWA GmbH) The PMSMs newly added to the portfolio feature a control range of 1:200, enabling a wider range of applications to be covered by the same drive or pump. (Source: LEWA GmbH) The PMSM also has a constant torque, i.e., the entire torque can be accessed at 0 rpm. This ensures a particularly smooth and gentle start-up of the system, as each process can be initiated with a conveyance rate of 1 percent instead of the usual 10 percent. (Example: Metering omega-3 fatty acids in the production of baby food) (Source: Adobe Stock) The constant torque of the PMSM allows for continuous operation at low speeds, unlike the depicted ASM. Oversizing for the required starting torque of the pump has become unnecessary due to the high overload capacity of the PMSM. (Source: LEWA GmbH) In contrast to the ASMs shown, the constant torque of the PMSM enables continuous operation at low speeds. Oversizing for the required pump starting torque has become unnecessary due to the high overload capability of the PMSM. (Source: LEWA GmbH) Like the asynchronous motor, the PMSM can be controlled via a standard frequency converter (NORD, Danfoss, etc.) with special parameterization, so that users can rely on common parts. (Source: Getriebebau NORD GmbH & Co. KG) Decentralized solutions in which the frequency converter is installed directly on the PMSM are also already possible with the PMSMs selected by LEWA. (Source: Getriebebau NORD GmbH & Co. KG) Decentralized solutions in which the frequency converter is installed directly on the PMSM are also already possible with the PMSMs selected by LEWA. (Source: Getriebebau NORD GmbH & Co. KG) Already in 2020, LEWA conducted initial functional tests with the NORD PMSM prototype and an ecodos pump on the pump test stand. Especially in the lower speed range, the PMSM successfully demonstrated the advantages of constant torque: the ecodos test pump could be operated in a range of 1:480 up to 5 bar. (Source: LEWA GmbH)
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Wide-range Speed Control for Diaphragm Metering Pumps - ecodos pumps cover wider range of applications thanks to new drive system

Energy efficient in accordance with class IE5+: Compact permanent magnet synchronous motor extends control range and reduces total cost of ownership

In many applications, metering ingredients in the pharmaceutical or food industry for example, pumps are required that not only can be precisely controlled in terms of flow rate and dosing time, but also convey the ingredients particularly gently. To enable the proven pump units of the ecodos series…

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