ELECTRIC PROPULSION SHIP SYSTEM WITH TWO-SCREW PROPULSION UNIT WITH RING STRUCTURE ENGINES Russian patent published in 2014 - IPC B63H21/17 

FIELD: transport.

SUBSTANCE: electric propulsion ship system contains switchboard buses connected via circuit breaker and reactance to reversible frequency converter. Two propelling motors are connected respectively to frequency converter with two separate output power circuits. Propelling motors with permanent-magnet excitation have ring structure. Fixed pitch propellers are installed in rotor pockets of each motor. Blades of the first propeller are made with opposite turn to blades of the second propeller. Frequency converter contains controlled input rectifier whose power output is connected with condenser-type accumulator of direct current section, voltage sensor of direct current section with power inputs of two inverters, as well as two frequency setting device. Frequency converter components control is executed using local control system.

EFFECT: higher coefficient of efficiency, lower energy losses, lower level of noise and vibrations.

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