Abstract Body

We have been conducting pioneering researches on the fundamentals and applications of the High Temperature Superconductor Induction/Synchronous Motor (HTS-ISM) [1,2]. In this study, based on our mature development experiences of the HTS-ISMs to date, and with a view to realizing a practical rotating system for the next generation transportation equipment, we conduct rotation tests to drive multiple HTS-ISMs with a single inverter.

We construct the rotation test system shown in Figure 1 for two 20 kW-class HTS-ISM prototypes that have already been produced. That is, we connect two 20 kW-class HTS-ISMs to a general voltage-controlled two-level pulse-width modulation inverter, and evaluate the rotation characteristics in detail when different loads were applied to each HTS-ISM at a temperature of 77 K. By succeeding the test, it is possible to demonstrate that two motors with synchronous mode can be simultaneously driven by one inverter. Detailed experimental methods and results will be reported on the day of the presentation.

References

[1] T. Nakamura, M. Yoshikawa, T. Terazawa, K. Matsuki, Y. Gao and T. Kiss, "Development of 50-kW-Class High-Temperature Superconducting Induction/Synchronous Motor with Continuous Drive Characteristics from Room Temperature," IEEE Transactions on Applied Superconductivity, vol. 33, no. 5, 5200205 (5pp) (2023)

[2] T. Nakamura and Y. Ogama, "Relationship between the Induced Voltage of a Rotor Bar and the Rotation Characteristics of a High-Temperature Superconducting Induction Motor," Journal of Applied Physics, in press.

Acknowledgment

We would like to express our gratitude to J. Matsuura and T. Ogasa for their assistance with the experimental set-up at Kyoto University. This study was supported by JSPS KAKENHI (grant number 22H01471).

Figure 1. Schematic diagram of one inverter - two motor drive system using HTS-ISMs.

Keywords: HTS induction/synchronous motor, One inverter-two motors system, Transportation equipment