Motion detector according to the Ferraris principle

Details Motion detector according to the Ferraris principle Motion detector according to the Ferraris principle

2005-02-08

2005-02-08

Kwok, Helen (Department: 2856)

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

C073S514160, C324S164000

Reexamination Certificate

active

06851318

ABSTRACT:
In a motion detector according to the Ferraris principle, an excitation element applies an inhomogeneous time-dependent alternating magnetic field to an induction element. A motion of the induction element induces in the induction element an eddy current with a temporal characteristic that depends both on the velocity and the acceleration. A sensor element measures the temporal characteristic of the eddy current and supplies the temporal characteristic to a signal processing circuit which determines at least one useful signal that is proportional to the velocity and acceleration, respectively.

REFERENCES:
patent: 3848157 (1974-11-01), Kripl
patent: 6462535 (2002-10-01), Schwabe
patent: 6636032 (2003-10-01), Schwabe
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G. Behr: “Alternating current tachometer machines operating according to the Ferraris principle”[Wechselstrom-Tachometermaschinen nach dem Ferrarisprinzip], ZMSR, vol. 8, 1959, pp. 355 to 360.
E. Habiger: “Foundation for dimensioning the Ferraris machines as a control element” [Grundlagen für die Bemessung der Ferrarismaschine als regelungstechnisches Bauelement], Elektrie, vol. 6 (1964), pp. 170 to 178.
IBM Technical Disclosure Bulletin, J.F. Kripl: Brushless Tachometer System, vol. 16, No. 1 Jun. 1973, pp. 237, 238.

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