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US 12,668,341 B2Granted
Marine propulsion device and marine vessel
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorKeiichi Tanimura
Life of this patent
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Abstract
A marine propulsion device includes a controller configured or programmed to calculate a rotation speed of a rotor based on a magnetic flux density detected by a detector, and correct a deviation in a calculated magnet position of the rotor due to an eddy current generated in a metal based on the calculated rotation speed of the rotor.
Claims20
A marine propulsion device comprising:
- a duct including a stator;
- a propeller including a rim including a rotor radially inward of the stator and facing the stator, and blades radially inward of the rim;
- a detector facing the rotor via a metal to detect a magnetic flux density generated by a magnet of the rotor;
- and
- a controller configured or programmed to calculate a magnet position of the rotor based on the magnetic flux density detected by the detector, and perform a control to apply a current to the stator at a timing at which the rotor is able to obtain a maximum torque based on a calculated magnet position of the rotor;
- wherein
- the controller is configured or programmed to calculate a rotation speed of the rotor based on the magnetic flux density detected by the detector, and correct a deviation in the calculated magnet position of the rotor due to an eddy current generated in the metal based on the calculated rotation speed of the rotor.
4 more elements
A marine vessel comprising:
- a hull;
- and
- a marine propulsion device attached to the hull;
- wherein the marine propulsion device includes:
- a duct including a stator;
- a propeller including a rim including a rotor radially inward of the stator and facing the stator, and blades radially inward of the rim;
- a detector facing the rotor via a metal to detect a magnetic flux density generated by a magnet of the rotor;
- and
- a controller configured or programmed to calculate a magnet position of the rotor based on the magnetic flux density detected by the detector, and perform a control to apply a current to the stator at a timing at which the rotor is able to obtain a maximum torque based on the calculated magnet position of the rotor;
- and
- the controller is configured or programmed to calculate a rotation speed of the rotor based on the magnetic flux density detected by the detector, and correct a deviation in the calculated magnet position of the rotor due to an eddy current generated in the metal based on the calculated rotation speed of the rotor.
8 more elements
Dependencies are inferred from the claim text.