Title:
SHIP PROPULSION UNIT AND SHIP WITH THE SAME
Document Type and Number:
Japanese Patent JP2018079743
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a ship propulsion unit capable of obtaining the stable thrust even at a low speed and a ship.SOLUTION: The electric propulsion unit 4 has a cylindrical duct 41 with a stator part 47 and a propeller part 42. The propeller part 42 includes a rim 51 and blades 52 formed in its inside. The rim 51 is placed in the position facing the stator part 47 and has a rotor part 53 constituting the electric motor 50 as well as the stator part 47. The duct 41 forms a gap between the rim 51 and the duct, into which the surrounding water is introduced, and provides a fluid bearing 20 lubricating between the rim 51 and the duct with water introduced into the gap from the surrounding. A controller to control the electric motor 50 drives the electric motor 50 by the rotation speed control in a rotation speed control region where the output command is less than a specified value, and drives the electric motor 50 by the torque control in a torque control region where the output command exceeds the specified value.SELECTED DRAWING: Figure 1
Inventors:
SUZUKI TAKAYOSHI
YAMAGUCHI KOHEI
YAMAGUCHI KOHEI
Application Number:
JP2016221861A
Publication Date:
May 24, 2018
Filing Date:
November 14, 2016
Export Citation:
Assignee:
YAMAHA MOTOR CO LTD
International Classes:
B63H20/00; B63H1/12; B63H5/15; B63H23/32; H02K7/14
Attorney, Agent or Firm:
Patent Business Corporation Ai Patent Office