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Home Automatisms

Ultra-fine dosage with micropumps trained with microengineers

By Contrôles Essais Mesures
December 4, 2015
in Automatisms, Measures
Reading time: 3 min
Gear pump - Pump
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Today, modern electronics and precision mechanics can miniaturize many elements of everyday and professional life. The Gerotor micro pumps used in the field of fluid transport are a successful example. Their simple construction, without valve, allows compact dimensions for an output flow almost without pulsations and easily adjustable. To train these fluid transport machines, Faulhaber's C.C. electronically switched microengcess are particularly well suited. They also have very compact dimensions, offering a high power density and a large range of speed for a very good dynamic. Thus, it is possible to regulate flows precisely, from the smallest volumes to constant maximum flows.

Accurate, high-performance pushback

There are many areas where small amounts of liquid need to be targeted. If long-term operation and joint-free construction are required, state-of-the-art technology is required. The scopes include the transport of crystallized, light-sensitive or gas-emitting substances, as well as fuel cells, the transport of urea solution (AdBlue) for the denitrification of gaseous effluents on diesel engines, or the dialysis and analysis technique. The pump head, which is tightly closed, is driven by a strong magnetic clutch with rare earths, which prevents flight-side leaks. In combination with available materials, such as nickel-based carbide, stainless steels, aluminum or zirconium oxide-based ceramics, silicon carbide or plastics such as PTFE, PEEK and FKM, pumps can be adapted to the most diverse, even aggressive, substances. The pump, with a diameter of only 22 mm and a length of 69 mm for a power voltage of 24 V, weighs about 100 g and can charge 4.8 to 72 ml/min, at a back-up pressure of up to 5 bar. The toothed crown construction allows a range of viscosity from 0.3 to 100 mPas. In this case, the pulse is about. 6% and differential pressure is between 0 and 5 bar. The construction principle with cycloidal gears, which works without a valve, guarantees low shear tensions when back-up.

Compact micromotors

The pump is driven by an electronically switched DC engine with a Faulhaber built-in speed controller. Its broom-free construction increases the life and reliability of the drive. Engine-adjusted rotational speed control is guaranteed by a speed controller with the same diameter as the engine and mounted downstream of the engine. This allows the user to easily adjust the rotation speed, via an analog input from 0 to 10 V. A digital input defines the direction of rotation. The digital frequency output provides a 15 mA output signal for other monitoring functions, with 6 pulses per rotation. The power voltage of the workouts is 12 or 24 VDC; in this case, the 22 mm engines have a power of about. 9 W and a torque of up to 59.9 minutes. The speed controller is powered in 5 to 28 VDC by a separate flat cable. High engine performance (approximately 68%) and regulation electronics (over 95%) run long times, even on battery-powered mobile devices. The solid stainless steel case and the large operating temperature range (-40 to 85 degrees Fahrenheit) also allow for outdoor use for environmental measurements in the field. Because microenges have a considerable point overload capacity, they can easily overcome the increase in the initial take-off torque of the pump (for example after the night temperature drops and thus the increase in fluid viscosity).

Find out more: www.faulhaber.com

 

 

 

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