The preliminary experiments of a tubular linear actuator in the vertical direction using YBCO bulk was studied. In active-maglev systems the leviation height was adjusted by varying the operating current through an electromagnet. Synchronous operations by a travelling magnetic field generated by using a three-phase aiternating current was achieved. The primary consists of six ring-shaped copper-winding coils without iron core and was supplied with three-phase sinusoidal excitation. The electromagnetic phenomenon within the bulk superconducted was also studied using a computer program based on the finite element method.
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