Monitoring an electromagnetic clutch

A switched current source 3 drives an electromagnetic clutch 1. The current flowing through the electromagnet is monitored, and is kept between two thresholds by a Schmitt trigger 5 controlling the current source. The thresholds depend on whether the clutch is to be engaged or disengaged. The freque...

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Bibliographische Detailangaben
Hauptverfasser:	ULF DELANG, HEINRICH HEIDI
Format:	Patent
Sprache:	eng
Schlagworte:	BLASTING BRAKES CLUTCHES COUPLINGS FOR TRANSMITTING ROTATION ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS HEATING LIGHTING MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES MECHANICAL ENGINEERING PHYSICS TESTING THERMAL INSULATION IN GENERAL WEAPONS
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Beschreibung
Zusammenfassung:	A switched current source 3 drives an electromagnetic clutch 1. The current flowing through the electromagnet is monitored, and is kept between two thresholds by a Schmitt trigger 5 controlling the current source. The thresholds depend on whether the clutch is to be engaged or disengaged. The frequency fM of the switching (or of the current in the winding) is measured, and compared 10 to a reference frequency fR to verify that the clutch is positioned correctly. The circuit is suitable for use in a printing press.