the temperature, l is the thermal conductivity, DH SL is the latent heat of solidification, f L is the liquid fraction, d is

We have developed a new magnetic Sensor Using a rotational magnetic field with a three-axis search coil for non-destructive testing(NDT). Using specimens with a machined crack in the center, we investigated the relationship between the position and the depth of a crack and the output signal of the three-axis search coil. The results of our experiments,.t;his sensor can clearly detect a crack existine on the revers e side of the sensine surface. In coil positioned orthogonal over the x-axis searchcoil. Each-=is search coil has 700 turns, The z-axis coil is a pamik"kpe Coil which outer radius is 1~" and thickness i s 1 " .It has 2oo-tums nXi& of 0 . 0 4~ Copper Wire. order to obtain large output signals, x-and y-axis search coils have an amorphous core( 1 x 7 x 7 m 3 ) . 0 " this paper, we present the construction, results of numerical analysis and experimental results of this sensor.

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In mechanical gear systems, dust, noise, vibration, and tooth wear are generated by frictions among gear teeth, and suppressing friction requires lubrication. Magnetic gears transmit torque by magnetic forces without contact and so avoid contact-related problems. The present paper discusses magnet arrangements and the shape of stationary gear teeth to improve transmission torque in surface magnet type magnetic gear transmission mechanisms.

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