Variable speed pump drives for industrial machinery—system considerations

Rexroth Sytronix

Challenge:

Increase system efficiency in pressure-holding operations by utilizing a combination of hydraulics and electric drives

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Rexroth Solution:

  • Intelligent electrohydraulics for greater control and flexibility

Key Insights & Considerations:

  • Dynamic performance and power requirements determine the choice of the motor
  • Select motor and drive size based on pressure-flow-time cycle (p/Q profile) for the application
  • When selecting pumps, consider suitability of pump construction for variable speed operation
  • Also consider mechanical and volumetric efficiency of the pump at the design operating points