Circuit configuration for monitoring an electromagnetically actu

Details Circuit configuration for monitoring an electromagnetically actu Circuit configuration for monitoring an electromagnetically actu

1992-09-10

1994-02-22

Snow, Walter E.

Electricity: measuring and testing

Electromechanical switching device

340644, G01R 3102

Patent

active

052891313

ABSTRACT:
A circuit configuration is provided for monitoring an electromagnetically actuated device, such as an electromagnetic clutch. The circuit comprises a switchable power source connected to the winding of the electromagnet; the power source supplies a composite voltage formed of a direct voltage part and a periodic alternating voltage part superimposed on one another. Engage and disengage signals are issued for the clutch and the direct voltage part assumes distinctly different levels in dependence on the engage and disengage signals. A precision resistor is connected in series with the winding of the electromagnet and a voltage sensor is connected at a node between the winding and the precision resistor. An evaluation circuit is connected to the voltage sensor for evaluating the alternating voltage part acting on the precision resistor and receiving therefrom information regarding the functionality of the electromagnetic device.

REFERENCES:
patent: 4467272 (1984-08-01), Hassler et al.
patent: 4990854 (1991-02-01), Fritz

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