H. Matsuki

Experimental considerations on a new automatic cooling device using temperature-sensitive magnetic fluid

An automatic cooling device to eliminate the waste heat of machinery has been made by utilizing a temperature-sensitive magnetic fluid. This cooler requires no pump for flowing the fluid, since a part of the thermal energy is converted to the kinetic energy. If a permanent magnet is used, power supply is unnecessary. The cooler is expected to be maintenance-free and simple in shape.

High quality soft heating method utilizing temperature dependence of permeability and core loss of low Curie temperature Ferrite

High quality Soft Heating method utilizing low Curie temperature ferrite is developed. The heater generates sufficient heat at room temperature and stops heating abruptly an the Curie temperature. The heat characteristics of the heater and the suitable exciting conditions are clarified.

A new cloth inductor using amorphous fiber

A new cloth inductor using amorphous magnetic fibers is proposed and discussed on its design and characteristics along with experimental results. The cloth inductor realizes larger inductance per unit volume than that of chip type inductor and therefore is able to be miniaturized. Furthermore, an isolating transformer in cloth structure is fabricated, which acts in the frequency range up to 10 MHz.

An optimum design of a soft heating system for local hyperthermia

The hybrid heater based on Soft Heating method is miniaturized without reducing heating power density. A prototype heating system for local hyperthermia is designed. The temperature distribution established in a phantom is measured.

Performance of an automatic cooling device using a temperature-sensitive magnetic fluid

Abstract Performance of an automatic cooling device using a temperature-sensitive magnetic fluid is discussed in connection with the temperature range in which the cooler operates steadily.

Performance of miniaturized magnetic devices in cloth structure

Design and characteristics of miniaturized magnetic device in cloth structure are discussed by using machine -made devices. The method of optimization of size of amorphous fiber and conductive fiber is made clear. The inductor with quality factor Q\simeq20 and inductance per unit volume L d >10µH/mm3is realized.

An optimum design method used for cloth-structured magnetic device

A design method of cloth-structured magnetic device was obtained and it made clear the optimized relation between amorphous fiber and conductive fiber in size. At the design method, inductance, equivalent resistance and quality factor of cloth-structured magnetic devices were obtained analytically. It was close agreement between the measured value and the computed one. Furthermore, the stray capacitance of the device was estimated from the analysis of equivalent circuit. The analysis showed very small capacitance in the cloth-structured device.

Temperature-speed characteristics of new motors utilizing temperature-sensitive magnetic cores

The possibility of using temperature-sensitive magnetic cores in the field of rotating electric machinery has been proposed by us, and new motors with such cores as a part of the magnetic path have been made. These simplified motors of which the speed is automatically controlled by the temperature change have a larger temperature dependence than ordinary motors.

A new instrument for temperature measurement using temperature-sensitive magnetic fluid

A new instrument for temperature measurement utilizing a temperature-sensitive magnetic fluid has been made. The instrument measures the inside temperature of a machinery and protects its overheating. The surface temperature is also measured by painting the magnetic fluid on the devices to be measured. The instrument easily measures temperatures with high sensitivity.