High-Efficiency Ship Propeller Based on Electric Direct Drive Without Shaft Rim

Optimization of Direct Drive Induction Motors for Electric Ship Propulsion with High Speed Propellers

Direct drive electric ship propulsion can offer increased flexibility and reduced overall fuel consumption compared to geared mechanical systems [Davis 1987, Doerry 2007]. As a well-established technology, induction motors are a dependable and economical option for electrically controlled ship propulsion, but their size and weight are large due to the relatively low propeller speeds. Increasing...

Direct Drive Ac Rim Motor for Responsive Energy Control of Alternative Electric Vehicle Final Report

The Study on Maneuverability of Electric Propulsion All-Direction Vector Thrusting Ship Using Rudder Propeller

This paper studied the maneuverability of the pure electric propulsion all-direction vector thrusting ship called “Century myth”, which also is the first one of its kind in inland rivers in China. Abilities such as turning, stop, changing of course and course keeping are studied. The main research method is by test and comparison, the result shows that the maneuverability of this kind of ship i...

Computational Analysis of Propeller Sheet Cavitation and Propeller-ship Interaction

This paper describes a computational procedure which is being developed for the practical analysis of propeller sheet cavitation and propeller-ship interaction including hull pressure fluctuations. The computational procedure consists of three different, coupled methods: (i) a RANS method for the analysis of the viscous flow around the ship hull and the determination of the velocity field in th...

System Efficiency Improvement for Electric Vehicles Adopting a Permanent Magnet Synchronous Motor Direct Drive System

To improve the endurance mileage of electric vehicles (EVs), it is important to decrease the energy consumption of the Permanent Magnet Synchronous Motor (PMSM) drive system. This paper proposes a novel loss optimization control strategy named system efficiency improvement control which can optimize both inverter and motor losses. A nonlinear power converter loss model is built to fit the nonli...