Profiles and Activities : National University Corporation Fukushima University


Shinichi Okanuma(Professor)
Affiliated Specialty Division Division of Human Support System
Specialized Field of Study Electrical Engineering, Non-linear Magnetic Application 
Final Academic Background Graduate School of Engineering, Tohoku University 
Academic Degree Ph. D(Tohoku University, JAPAN )

Courses In Charge

Electrical and Electronic Circuits 
The lecture gives basic analysis theory of the electric and electronic circuits that connect active and passive components such as resistors, inductors, capacitors, transistors, MOSFET, and operational amplifiers.
Practice of Electrical and Electronic Circuits 
Based on the knowledge of basic analysis theory learned in the lecture of electric and electronic circuits, students get more advanced knowledge about the electric and electronic circuits by solving exercises. Furthermore, how to use the general purpose circuit simulation program is presented in the lecture. 
Experiments on Physics 
Students learn fundamental laws of physics by experiments. Dynamics, Heat, an electromagnetic phenomenon, the measurement of magnetization ferromagnetic material, how to use of oscilloscope and an electronic circuits, Hall effect, Spectrum, an electronic specific charge and measurement of β-rays are contained in the experiment theme. 

Main Research

Development of Magnetic Oscillation Type Sinusoidal-output Inverter
At present, PWM inverter is used to supply electric power to the mains from dc voltage source generated by the solar cell and the fuel cell. On the other hand, I propose a new sinusoidal-output inverter based on the principle of magnetic oscillation which is different method from the PWM inverter. The inverter has simple construction, and can supply electric power to the mains directly from dc voltage source.
Applications of Bridge-connected Magnetic Circuit to New Measuring and Controlling Devices
A bridge-connected magnetic circuit is a magnetic controlling device which consists of a toroidal core with small coercive force and rectangular hysteresis loop and a U-form core with low permeability. Maximum flux value of the toroidal core can be easily controlled by the signal-current flows through the winding of U-form core. Utilizing this feature, I am proposing applications of the bridge-connected magnetic circuit, by using that independently or combining with magnetic oscillation circuit, to new measuring and controlling instruments such as power meter with high performance and variable voltage parametric transformer.

Introduction of Laboratory

My research field is non-linear magnetic application in the area of electrical engineering, and my present interest is magnetic oscillation circuit and its application. In the magnetic oscillation, several power semiconductors such as transistor and MOSFET are switched with the saturation of magnetic core, and the magnetic oscillation circuit is applied as the power unit with very simple construction from the old days. My present research is to develop new measuring and controlling instruments utilizing the magnetic oscillation.

Recent Writings, etc.

1. S. Okanuma: Consideration of the Fundamental Characteristics of a Sinusoidal-Wave Output Inverter Utilizing Magnetic Oscillation, Journal of the Magnetics Society of Japan, Vol. 30, No. 2, pp.286-289 (2006) 
2. S. Okanuma: Fundamental Characteristics of a Sinusoidal-Wave Output Inverter Utilizing Magnetic Oscillation Circuit with Single DC Voltage Supply, Journal of the Magnetics Society of Japan, Vol. 31, No. 3, pp.231-234 (2007)