Pump unit for heating or cooling circuit - uses frequency regulator to reduce rotation of pump motor upon detected overheating

The pump unit (1, 3) has its rotation rate controlled by varying the working frequency of a frequency regulator (4), supplying the pump electric drive motor (3). The pump unit (1, 3) and the frequency regulator (4) are combined, with the rotation reduced via the regulator (4) when an overheating con...

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Bibliographische Detailangaben
Hauptverfasser:	PEDERSEN, BJARNE DISSING, HAMMEL, DK, KNUDSEN, IVAN, BJERRINGBRO, DK, JENSEN, NIELS DUE
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRICITY EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS GENERATION HEATING LIGHTING MECHANICAL ENGINEERING NON-POSITIVE DISPLACEMENT PUMPS POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS PUMPS FOR LIQUIDS OR ELASTIC FLUIDS WEAPONS
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Beschreibung
Zusammenfassung:	The pump unit (1, 3) has its rotation rate controlled by varying the working frequency of a frequency regulator (4), supplying the pump electric drive motor (3). The pump unit (1, 3) and the frequency regulator (4) are combined, with the rotation reduced via the regulator (4) when an overheating condition is detected to half the normal rotation rate. - The thermal overload condition is detected by measuring the temp. of the drive motor stator winding, e.g. by measuring the electrical winding resistance.