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P. Kolpakhchyan et al: Emergency Generator Design for the Maritime Transport... INTRODUCTION / Uvod Application of modern life-saving appliances on ships is one of the main components of the crew and passengers safety. Nowadays the lifeboat is a vessel with a variety of communication, control and determination of geographic co-ordinates systems, which requires a sustainable and long-term emergency electrical power. The use of mobile generators or batteries is the solution to this challenge. Classical electrical generators have large dimensions and weight parameters, which makes them difficult to operate in small boats. The batteries are not good to use because they do not have sufficient energy performance. At the same time the use of additional equipment that controls the charge and capacity of elements is a problem. For these reasons, the development of a compact and economical source of electrical energy for use in lifeboats is a relevant scientific and technical challenge. It is expedient to use linear electrical generators driven by internal combustion piston engines as auxiliary power source with a capacity of more than 4 kW in small vessels [1]. Application of the reciprocating electrical machines combined with engine’s cylinder improves weight, size and power of the generator. A positive feature of the reciprocating generators is the absence of crank mechanism. It reduces the system inertia and accelerates the system response to fluctuations in the power consumed by the load. The cylinders do not have a mechanical connection and can be made independently. It allows building a generating system of electricity on a modular principle. Possibility of independent operation allows connecting and disconnecting separate modules, to optimize power generation system, to increase the capacity of autonomous power supply system [2-4]. The following goals of this research were formulated by analyzing the standby generator application and the demands for his energy, weight and size parameters: • choosing the optimal type of electrical machine and variant of coupling of the combustion engine used in the generator; • elaboration of the electrical machine construction used in the generator; • elaboration of the control system for the generator to reach high energy, weight and size parameters. Emergency Generator Design for the Maritime Transport Based on the Free-Piston Combustion Engine