PIEZOELECTRIC SENSOR FOR ELECTRIC MOTOR C URRENT MEASUREMENT

This paper deals with the study and the modelling of a piezoelectric s ensor used with an electronic system for the current measurement of an electric motor. Thus it has to deliver an electromotive force proport ional to the square of the motor supply current. The strain of a thin piezoelectric plate glued onto a metallic plate is used. This latter u ndergoes an electromagnetic stress proportional to the square of the s upplied current of the motor. Analytical and finite element modelling were developed and compared to experimental results.