Product category:
Hydraulic equipment and fluids
News Release from: Bosch Rexroth | Subject: Variable-speed pump drives
Edited by the Manufacturingtalk Editorial
Team on 31 December 2007
Variable speed pump drives save on
energy
Variable speed hydraulic pump drives offer energy savings and noise reduction and two recently introduced systems can control pressure and flow on a machine.
In past decades, the technical development of hydraulic plastics processing machines and machine tools was mainly driven by the objective of increasing productivity (accuracy, cycle time, etc.) The use of proportional and high-response valves and the improvement of energy balance through the use of electronically adjustable pumps were in the forefront
This article was originally published on Manufacturingtalk on 16 Sep 2008 at 8.00am (UK)
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In the last few years, the requirements with regard to energy savings and noise reduction have become increasingly stringent.
To meet these demands, Rexroth has developed variable-speed pump drives (DvP), which are combinations of variable-speed electric motors and pumps.
They reduce the electric motor speed so energy can be saved, especially while idling.
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Depending on the machine cycle, the speed reduction can contribute significant energy savings and noise reduction during slow movements, said Rexroth.
Rexroth provides two concepts, as follows.
* One is a simple frequency converter using a standard electric motor and variable displacement pump with electronic adjustment (e g, DFEC system).
* The second is a highly dynamic servo-motor with fixed displacement pump.
Rexroth said, at EMO 2007, that both systems can control pressure and flow on a machine.
The first variant is fitted with today's proven pump technology (A10-SYDFEE), which meets all requirements with regard to dynamics and accuracy.
The demands made on the frequency converter and the electric motor are very low, especially with regard to dynamics and the generation of high torques when holding a certain pressure.
The second variant employs high dynamics servo-motors with feedback and associated converters, in most of the cases with local intelligence.
With this method there are additional engineering considerations; apart from continuous torque, acceleration torques must be taken into account.
Rexroth told manufacturingtalk.com that it can satisfy the demands made on the components largely utilizing combinations from the standard product range.
A new technical challenge is highly dynamic pressure control via the pump and the servo-motor.
Here, hydraulics-specific controller strategies can be utilized, which are known from applications of the variable displacement pump.
Due to this multiple technology drive competence, Rexroth is positioned to offer its customers optimum solutions.
* About Rexroth - Bosch Rexroth AG is one of the world's leading specialists in the field of drive and control technologies.
Under the brand name of Rexroth the company supplies more than 500,000 customers with tailored solutions for driving, controlling and moving machinery used in industrial and factory automation as well as in mobile applications.
As The Drive and Control Company, Bosch Rexroth develops, produces and sells components and systems in more than 80 countries.
In 2006 Bosch Rexroth AG, part of the Bosch Group, achieved sales of approximately EUR 4.9 billion with more than 29,800 employees. Request a free brochure from Bosch Rexroth ...
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