Changing the design of a synchronous motor after testing Timur Petrov, Vladimir Kornilov, Alfred Safin, Nikita Kuvshinov, Alexey Tsvetkov and Ramil Gibadullin E3S Web Conf., 220 (2020) 01030 Published online: 16 December 2020 DOI: 10.1051/e3sconf/202022001030