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High temperature superconducting (HTSC) bulk can levitate stably on a track which consists of permanent magnets of the same polarity. This is because HTSC-bulk has a pinning force which keeps from ver...tical displacement due to the weight. We have proposed a new LSM theory which is based on an idea of considering the pinning force as synchronizing force in using armature travelling-magnetic-field instead of permanent magnets. However, the lift force enough to levitate the vehicle on the ground has not been produced, so that basic experiments to verify the theory have succeeded on the water by the help of simple HTSC-bulk ships. We had to study on a sufficiently large lift-force exerted between pinned HTSC-bulk and travelling-magnetic-field. This paper resents a basic experiment on two-dimensional force produced in HTSC-bulk in DC magnetic-field and that two different modes of repulsion and attraction are caused dependently on relative strength between pinning and external magnetic fields. Especially, two-dimensional force in repulsive mode is found to have stable region limited by peak values of levitation force. The largest levitation force among the peak velues obtained in the experiments is 20 newtons which is five times heavier than a weight of the HTSC-bulk magnet.show more
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