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This paper deals with the compressibility of ultrasonic compaction. The object is to find out the most effective factor in increasing the density of the compaction for high efficiency electrical motor with soft magnetic composite under ultrasonic action. To make clear the effects of the ultrasonic vibration on the target process and obtain general knowledge usable for the practical design, several...
Electric power generation efficiencies using a vibration of a piezoelectric element with array configurations were discussed. We have been investigating the piezoelectric energy harvesting using a polyurea thin film, which can be fabricated on the micro array structure. In our previous work, it was predicted that the higher power generation efficiency could be obtained with the shorter cantilever...
This report presents the metal powder compaction using ultrasonic vibration for the fabrication of a three-dimensionally-shaped magnetic core. First, we describe a design of ultrasonic compaction tools using FEM. Side wall of the sample was ultrasonically excited by a radial vibration of the die, while the upper and lower punches are driven by longitudinal vibrations. Second, we present the results...
An electric energy harvesting using a polyurea piezoelectric thin film is discussed. In this energy harvesting system, the mechanical energy is converted to the electric energy through the piezoelectric effect of the polyurea film on the device. The electric energy harvesting methods using the piezoelectric elements have been reported by several groups, and in most of these reports, piezoelectric...
This report presents novel configurations for magnetic field sensor using piezoelectric vibrations, which are based on the simple electromagnetic physics and require no semiconductor materials. First, we present the principle and basic characteristics of the proposed sensor with a piezoelectric bending vibrator. Second, the sensor is applied to a scanning probe of a permeability microscope for surface...
This report presents novel configurations for magnetic field sensing using piezoelectric vibrators, which is based on a simple electromagnetic physics and requires no semiconductor materials. First, we present the principle and a basic configuration of the sensor as well as theoretical estimations of the sensitivity. Second, one of the basic configurations using longitudinal vibration for the proposed...
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