For citations:

Safin A.R., Ivshin I.V., Gracheva E.I., Petrov T.I. Development of a mathematical model of an autonomous power supply source with a free piston motor on the basis of a synchronous electric returning machine with a permanent magnets. Power engineering: research, equipment, technology. 2020;22(1):38-48. (In Russ.) https://doi.org/10.30724/1998-9903-2020-22-1-38-48