High temperature superconducting (HTS) pinning maglev is considered to be one of the most ideal levitation techniques for high-speed transportation in future since its passive and self-stabilizing properties. An efficient and economical propulsion method is important for HTS pinning maglev system. This paper presents a novel HTS pinning maglev system employing a homopolar linear synchronous motor (H-LSM), which shows great potential for engineering. First, conceptual structure of the novel HTS pinning maglev system employing H-LSM is described. The H-LSM was designed to drive a 19-ton HTS pinning maglev engineering prototype using analytical and finite element methods. Then, a comparative performance and cost between H-LSM and permanent magnet linear synchronous motor (PM-LSM) is analyzed. Finally, in order to fully analyze the potential and electro-mechanical coupling of the system, a lateral dynamic response analysis is introduced. The result shows that the novel HTS pinning maglev system employing a H-LSM has a good propulsion-levitation-guidance (PLG) performance. The H-LSM can meet the propulsion requirements of HTS high-speed maglev vehicles with lower cost. The dynamic analysis shows that this new HTS pinning system employing H-LSM has good macroscopic performance for high-speed operation.

We have proposed a direct-drive wave energy converter (WEC) device with a high-temperature superconducting tubular linear generator (HTS-TLG) adopted, and compared the design results of the HTS-TLG and the conventional TLGs, which suggests clear advantages of the HTS-TLG. In this paper, we focus on the mechanical structure of the WEC, the cryogenic cooling system of the HTS-TLG, and the relation between the maximum output power and size of the heaving buoy. Besides, design results of a 2 MW HTS-TLG are compared to those of another counterpart, which verified that the proposed HTS-TLG provides higher pow-er density. In the end, induced voltage waveforms of the 2 MW HTS-TLG are plotted.

Due to the low radial restoring force stiffness of the radial high-T _c superconducting maglev bearing (SMB) in high-T _c superconducting flywheel energy storage system (SFESS), it is difficult to provide enough radial constraint when the rotation speed is high. The dynamic simulation analysis of the SFESS rotor was carried out based on the testing and analysis of the static force results of the SMB. On the one hand, according to the results of dynamic analysis, the flywheel rotor would be eccentric when it is subjected to an unbalanced force. On the other hand, because of the special operation mechanism of the SFESS, the flywheel rotor would be prone to be eccentric before rotation. These two types of eccentricity will affect the operating performance of SFESS. Therefore, the research on the working condition of SFESS under eccentric state not only can predict the operating performance of SFESS in extreme cases in advance but also judge whether the SFESS has eccentric operation by comparing the real-time speed value with the preset value, which is of great significance to the further research of the SFESS.

As a novel form of energy storage, large-capacity flywheels offer a promising solution for supporting the efficient operation of new energy grid connection and advanced power system. In order to ensure the stable operation of the flywheel rotor, the introduction of superconducting maglev bearings (SMB), characterized by stable levitation without the need for an origin, low energy losses, and high rotational speeds, can significantly enhance the performance of large-capacity flywheel. This paper focuses on a 100 kWh flywheel energy storage system, where the axial load requirement for the heavy-duty bearing system is set at 8 tonnes. A rotor-excited SMB system is designed, with reference to the stator-excited SMB designed by the Japan Institute of Iron and Steel Technology (ISIT), to investigate the levitation performance of both SMB configurations at different temperatures. Furthermore, the levitation force and stiffness are calculated under optimal parameter combinations to compare the mechanical performances of the two configurations. The mechanical properties of the bearing system are compared. The results reveal that, due to structural differences, the rotor-excited and stator-excited SMBs exhibit distinct levitation characteristics and mechanical properties, each offering specific advantages and disadvantages for the operation of large-capacity flywheels. These findings provide valuable insights and solutions for further performance optimization of such systems.

To utilize wave energy, we propose a power take-off (PTO) device mainly composed of a novel buoy and a high-temperature superconducting synchronous reluctance linear generator (HTS-SRLG). We describe the conceptual structure and function of the buoy, which makes use of seawater to provide more power to the HTS-SRLG. Then, we introduce the configuration and the key electrical design process of the HTS-SRLG. Design result of the HTS-SRLG is presented and compared with that of counterparts to demonstrate its advantages in performance and in application. This study is conducted from the viewpoint of promoting the industrial application of HTS machines. The proposed buoy gives an insight of improving the utilizing efficiency of wave energy. And the HTS-SRLG contributes to simplify the generator cooling.