Enhanced performance variable-reluctance transducer for linear-position sensing

The paper presents a development of the linear position transducer of variable-reluctance type, which has enlarged the operating velocity range without a deterioration in accuracy, in comparison with the earlier linear variable-reluctance transducer. An alternative magnetic circuit arrangement has been introduced to allow a substantial increase of excitation frequency with minimal detrimental effect on the output linearity. This, in turn, has enabled velocity-dependent dynamic error to be minimised, through a reduction of the phase shift between processed and actual amplitude envelopes of induced voltages, and by mitigating the undesirable impact of the velocity-dependent component of induced voltage on the output signal. The transducer´s accuracy and sensitivity remain independent of the sensing range.