Application of powerful multiphase electric machines in marine rowing electric installations

Abstract

The advantages of electric propulsion systems contribute to their use on ships and ships of the navy — icebreakers, ferries, tugboats, cruisers, etc., which require increased maneuverability and survivability. One of the significant disadvantages of electric propulsion systems, limiting their wider application, is the reduced efficiency compared to the direct transmission of the torque of the main drive motor to the propeller. In addition, compared to other variants of propulsive installations, rowing electric installations occupy more of the interior space of the vessel. Issues related to improving the reliability of electric propulsion systems are also relevant. If the three-phase power supply system is most widespread in coastal electric power systems, due to the cost-effectiveness of transmitting electricity over long distances, then on electric ships, due to the much shorter distances between sources (main generators) and main electric consumers (rowing electric motors), it seems advisable to use power supply systems with a number of phases greater than three. Based on the analysis of existing types, a new design of electric machines with several stator-rotor pairs integrated into each other, protected by a patent for the invention, is proposed. The use of such machines on electric drives, the stator cores of which are equipped with multiphase windings (with more than three phases), will solve the above tasks.