Vibration transducer for rotating shaft using a differential transformer

Abstract

Abstract A VIBRATION TRANSDUCER FOR SENSING VIBRATION OF A ROTATING SHAFT INCLUDES A SPECIAL DIFFERENTIA TRANSFORMER AND ELECTRONIC CIRCUITRY CONNECTED ACROSS THE TRANSFORMER SECONDARY WINDINGS FOR DEVELOPING A VOLTAGE PROPORTIONAL TO A CHARACTERISTIC OF THE VIBRATION SUCH AS DISPLACEMENT AMPLITUDE, VELOCITY AND ACCELERATION. THE DIFFERENTIAL TRANSFORMER INCLUDES AN ANNULAR ORE OF HIGH PERMEABILITY MATERIAL RIGIDLY FASTENED ON THE SHAFT SUBJECT TO VIBRATION, AND THE PRIMARY AND SECONDARY WINDINGS ARE ARRANGED IN AN ANNULAR COIL FROM MOUNTED ON A FIXED SUPPORT. THE ANNULAR COIL FROM IS POSITIONED AROUND THE CORE FORMING A SMALL AIR GAP THEREBETWEEN, AND THE CORE IS DISPLACED RELATIVE TO THE COIL FORM IN RESPONSE TO VIBRATION OF THE SHAFT AN ALTERNATING-CURRENT (A.C.) EXCITATION VOLTAGE OF CONSTANT FREQUENCY IS APPLIED ACROSS THE PRIMARY WINDING TO INDUCE ALTERNATING VOLTAGES OF THE SAME FREQUENCY IN THE SECONDARY WINDINGS. THE ELECTRONIC CIRCUIT FILTERS OUT THE EXCITATION FREQUENCY COMPONENT VOLTAGE AND PROCESSES THE REMAINING VIBRATION FREQUENCY COMPONENT VOLTAGE SIGNAL.

Inventors

• 👤 Gerald J Carlson

Bibliographic Details