Grundfos Management A/s

Grundfos Holding A/s

Henrik Kragh

Carsten Skovmose Kallesøe

Kim Hulegaard Jensen

Karsten Dyrbye

Bjarne Henriksen

A hydraulic system includes at least one hydraulic unit () having at least one flow path (), an hydraulic actuator (), provided for influencing a hydraulic flow through the flow path (), at least one sensor device (), and a control device () for controlling the hydraulic actuator (). The at least one sensor device () includes a storage device () provided for containing information specifying the hydraulic unit (). The control device () is configured to receive the information stored in the storage device () of the sensor device () and to set up a control of the hydraulic actuator () based on the received information specifying the hydraulic unit (). A method is provided for controlling the hydraulic actuator.

Hydraulic system

A method is provided for determining the temperature of the delivery fluid of a centrifugal pump driven by a permanent magnet motor, whose rotor runs within a fluid-filled can. The rotor temperature is evaluated by way of electrical variables of the motor, and the temperature of the delivery fluid is determined by way of the rotor. This method permits sensor-free temperature measurement of the delivery fluid with a circulation pump which is driven by a permanent magnet synchronous motor.

Method for determining the temperature of the delivery fluid of a centrifugal pump

The invention relates to a two-phase permanent magnet motor which is controlled by a frequency converter. The frequency converter is advantageously provided with a three-phase inverter having six switches that are controlled in such a manner as to minimize switching losses.

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Skørping, Denmark

Henrik Kragh