Study on differential transformer displacement sensors

This paper studies magnetic circuits of known and developed differential transformer sensors of large linear motion, which refer to circuits with special structure of magnetic resistance parameters distribution of long ferromagnetic cores and magnetic capacitance between them. It is shown that in the known sensor the distribution of the working magnetic fluxes along the length of the ferromagnetic cores has a nonlinear character, as a result of which the dependence between the output signal in the form of the electromotive force and the input linear motion of the sensor also has a nonlinear character. It was found that by selecting the law of changing the working gap between the middle and inner cores along the length of displacement of the moving measuring winding by making the middle concentric core in the form of a paraboloid of rotation, a linear distribution of the working magnetic flows along the length of the ferromagnetic cores and linearity of the transformation characteristic of the differential transformer sensor of large linear displacements are achieved.

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