Magnetoelastic force transducer

Details Magnetoelastic force transducer Magnetoelastic force transducer

1987-12-10

1989-05-02

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to force

G01L 112

Patent

active

048257095

ABSTRACT:
A magnetoelastic force transducer is made of two identical, cylindrical bodies of magnetic material which are held together by means of a stud bolt. In an axially extending and concentrically located inner space there is placed a bobbin with two measuring windings, connected in opposition, and an excitation winding supplied with alternating current. The interior of the transducer is shaped such that a thin cylindrical tubular wall is formed immediately opposite to the respective measuring winding in each one of the bodies. When the transducer is force-loaded via the stud bolt, a compressive stress arises in one of these tubular walls and a tensile stress arises in the other tubular wall. This influences the magnetic conditions such that a signal is obtained from the measuring windings which is proportional to the applied force. In order to eliminate a possible measuring signal at zero applied force, means is provided to move the bobbin in the axial direction. A natural prestress can be imparted to the core with the aid of a built-in spring means and an adjusting screw.

REFERENCES:
patent: 1906551 (1933-05-01), De Forest
patent: 4193294 (1980-03-01), Forslund et al.

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