Improving maintenance system for controlled asynchronous electric drives of electric locomotives based on their diagnosisM. S. Yakubov, K. Kh. Turdibekov, S. A. Norzhigitov and M. A. SagatovaE3S Web of Conf., 401 (2023) 05019DOI: https://doi.org/10.1051/e3sconf/202340105019