Vessel propulsion apparatus and vessel including the same
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United States of America Patent
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-
Jan 1, 2019
Grant Date -
May 17, 2018
app pub date -
Nov 13, 2017
filing date -
Nov 14, 2016
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A vessel propulsion apparatus includes a cylindrical duct including a stator and a propeller. The propeller includes a rim including a rotor disposed at a position facing the stator and defining an electric motor in combination with the stator, and blades on an inner side in a radial direction of the rim. A fluid bearing is provided on the duct and defines a gap into which surrounding water is introduced between the fluid bearing and the rim, and is water-lubricated with respect to the rim due to water introduced into the gap from the surroundings. The vessel propulsion apparatus further includes a motor controller that drives the electric motor by rotation speed control in a rotation speed control region in which an output command is not more than a predetermined value, and drives the electric motor by torque control in a torque control region in which an output command is more than the predetermined value.
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