We have been developing a new type of active-maglev system composed of field-cooleddisc-shaped YBCO bulk and multiple ring-shaped electromagnets, which arevertically piled up. One of the useful features of the active-maglev system is thatthe levitation height is adjustable by varying the operating current through anelectromagnet. Maximum levitation height in stable levitation, however, is restricted by themagnetic field distribution produced by the electromagnet. To enhance the levitationheight, we have fabricated and tested an active-maglev system with multiplering-shaped electromagnets instead of using a larger single electromagnet. Up tonow, we have reported the experimental results in a model active-maglev systemcomposed of five electromagnets and showed that the levitation height, as wellas stability, can be remarkably improved by adjusting the operating current ofeach electromagnet individually. In this study, we constructed a model systemoperated as a tubular linear synchronous actuator in the vertical direction inexpectation of it being applied in factory automation upgrading. The primary consistsof six ring-shaped copper-winding coils without iron core and is supplied withthree-phase sinusoidal excitation. A disc-shaped YBCO bulk, which was magnetizedby a field-cooling process, was adopted as a secondary (mover). We carried outpreliminary experiments to confirm the feasibility of synchronous operation andalso numerically investigated the electromagnetic phenomenon within the bulksuperconductor by a developed computer program based on the finite element method.