Patent ID: 7448286

Claim:
A device for determining working parameters of a magnetic clutch, the device comprising: an input part provide with an array of first magnets generating a first magnetic field; an output part provided with an array of second magnets generating a second magnetic field, the input and output parts being magnetically coupled and rotatable relative to one another, the two fields overlapping at least partially and thus forming a combined magnetic field; means including at least one sensor for measuring the combined magnetic field and for generating a signal corresponding thereto; and means including an evaluation unit coupled to the sensor for receiving the signal and determining therefrom at least one working parameter of the clutch, the evaluation unit being operative to process a temporal course of time segments of fixable length of the resulting magnetic field or its temporal differentiation based on a Fourier transformation and to determine an amplitude of at least one harmonic of the temporal course or a relative phase position of the at least one harmonic of the temporal course or the amplitude and relative phase position of the temporal course.