Publication Detail

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

Steven Englebretson, James Kirtley, Chryssostomos Chryssostomidis
8 pp.

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 the propeller speed allows the design of higher speed motors of comparable efficiency and significantly decreased size and weight. This paper first presents a typical steady-state circuit model of a ship propulsion motor based on published data of an existing 19 megawatt machine. Design variables and constraints specific to this application are discussed before comparing designs adapted to minimize size and weight for driving higher speed propellers. Predicted drive motor total size and weight decrease with increasing full load rotational speed. A basic examination of the motor cooling is also included to verify the feasibility of the new design and investigate possible limiting cases taking advantage of direct water-cooled conductors.

type: Technical reports

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Parent Project

Project No.: 2008-ESRDC-01-LEV
Title: Electric Ship Research and Development Consortium (ESRDC)

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