<Original Papers>On the Fundamental Study of the Characteristics of Electro-Magnetic Levitation Part 1 : On the Levitation Force

From the point of view of metallurgical research, it seems valuable to accumulate the knowledges of characteristics of electro-magnetic levitation. In the present study, the measurements were carried out on the specimens of copper, aluminum, and stainless steel to determine the effect of coil shape and power source frequency on the levitation force by the use of small power oscillator (200W). By comparing the measured value with theoretical one which is derived by Fromm and Jehn, the following conclusions were obtained ; 1) Measured values of strength of magnetic field along the coil axis agree well with the calculated one derived from the assumption of the superposition of single coils. 2) Calculated levitation force indicates the semi-quantitative agreement with the observed value. For aluminum and stainless steel specimens the calculations give the values which are 20-30% smaller than that of observed values and for copper specimen it gives about 40% smaller value than the actual one. 3) In the experimental range (45 to 160 kHz), levitation force changes linearly with logarithm of frequency and observed dependency on frequency is about 10% larger that of theoretical