AbstractThe development of high-temperature superconducting wire and cooling technology makes it possible to apply superconducting technology to motors. In actual use, the vibration problem of the high-temperature superconducting motor be-comes the key. Structural modal analysis is the basis of structural vibration analysis. This article take a high-temperature super-conducting motor as the research object, and perform equivalent mass modeling of the complex stator coil ends and symmetrical cooling pipelines to simplify the whole Machine finite element model. Through reasonable simplification of the finite element model, the modal simulation of the whole motor is completed, and then the prototype test is completed to verify the rationality of the simulation results.

To form the stator slots and isolate the stator and rotor, composite components for the oil-cooling air-core stator of a high temperature superconducting motor (HTSM) were designed based on a process that could be summarized as follows. First, the computational fluid dynamics analysis of the oil-cooling air-core stator was conducted. From the results, the load of temperature and oil pressure that apply on the composite cylinder were chosen to be 50 °C and 0.1 MPa, respectively. Second, the structure of the composite components was designed according to the forming technology, and the performance of that was obtained from the finite element method. The results show that the composite teeth were chosen to be a combination of GFRP block and 1Cr18Ni9Ti sheet. And the stresses of the composite cylinder with the thickness of 11 mm in all directions were lower and without buckling at 0.1 MPa. Third, the full-scale composite cylinder was designed and manufactured, and a full-scale simplified performance test platform was also developed to verify the strength of the cylinder. The test results show that the maximum strain of measuring point on the cylinder under 0.1 MPa is 325.1 $\mu \varepsilon $ , which meets the design requirements of the HTSM.

Permanent magnetization of electric windlass and mooring winch (EWMW) has become a research trend in the development of new generation deck machinery. The paper investigates the development of a low-speed and high-efficiency permanent magnet synchronous motor (PMSM) and its drive system based on the load characteristics and special requirements of an EWMW. Firstly, the design specifications and key points of the motor drive system are analyzed. Secondly, a design method of parameter matching is proposed to design a 110 kW 75 r/min PMSM based on finite element method, field circuit coupling, and co-simulation. Finally, a prototype is developed and applied to a 45 T EWMW. The test results show that the PMSM can attain an efficiency of 94.3% at the rated operation, good traction characteristics with high torque at low speed, and 3 times wide flux-weakening region at constant power. Therefore, the matching design method is effective in the design of PMSM and drive system for EWMW.

To shorten the cooling time of the superconducting rotor, reduce the thermal leakage of the cold mass, enhance the working stability of high-temperature superconducting (HTS) magnets, and reduce the amount of HTS wires, a novel warm rotor for a 200 kW HTS generator (HTSG) with radial support rods, tangential racetrack rings, and modular HTS magnets was successfully developed. There are 12 HTS magnets in 6 poles of the HTSG, all of which can work stably without quench, and the performance of the magnets meets the expectation. The vacuum, thermal insulation, and cryogenic systems of the generator run stably, which meet the needs of continuous operation at full load. The manufactured warm rotor and the original iron-core stator of the existing 200 kW HTSG were assembled into a new 200 kW HTSG, the assembly process was completed at Wuhan, and then finished the performance test. The test results show that the output power of the HTSG reaches 203.4 kW and the torque reaches 3885 N.m when the field current reaches 24 A and the speed is 500 r/min, which achieved the target power.