Excitation Field Analysis of Cogging-Free Superconducting Motors for Electromagnetic Catapult

In modern military combat, the controllability of the take-off mode of various aircraft urgently needs to be enhanced. The electromagnetic catapult technology can meet this demand. The electromagnetic catapult has a significant advantage as a way for the aircraft to take off, and the thrust generated by the device is provided by the linear motor (LM). With the development of superconducting materials, superconducting linear motors (SLM) have better performance. In this paper, the excitation magnetic field of SLM is analyzed in detail, mainly by using electrically excited LM. Firstly, Finite elements are used to analyze the excitation magnetic field of the linear synchronous motor in detail. Then, the three-dimensional structure of the superconducting magnet is analyzed. The maximum value of the superconducting magnet is 2.4 T. Then the magnetic field inside the superconducting coil (SC) is analyzed by finite element. The value of the magnetic field in the semicircular arc section can reach 2.06 T. The magnetic field value in the straight section is 2.18 T, so it can not be ignored. Finally, the superconducting magnet is put into the two-dimensional LM model to analyze the motor's magnetic field. The magnetic field distribution map of the motor at 0 ms and 30 ms is mainly analyzed. The maximum magnetic density in the superconducting LM is obtained, which mainly appears on the skeleton of the superconducting magnet in the excitation measurement. Its value reaches 4.38 T and 4.39 T.