Abstract: A method of and apparatus for measuring the vibration amplitude of an electromagnetic vibratory motor is disclosed in which the current induced in the coils of the motor is rectified and sensed and applied to a current signal conditioning circuit to produce an average current signal. The voltage across the coils is sensed and is applied to a voltage signal conditioning circuit to produce a peak voltage signal. First and second predetermined scale factor signals are generated. The average current signal is divided by the peak voltage signal and the result is multiplied by the second scale factor signal. The scaled divided signal is subtracted from the first scale factor signal to yield the desired signal representative of the vibration amplitude of the vibratory motor.

Abstract: A vibrating motor comprising a main frame and a center clamp between which the vibrator bars are secured for relative vibration of the main frame and the center clamp. Each of the main frame and the center clamp are formed as a fabricated construction of metal plate elements that are secured to each other in the respective assemblies by welding. Each of the main frame and the center clamp that is constructed in this manner is sufficiently rigid to securely hold the vibrator bars and their spacers.