Marine propulsion device

Inactive Publication Date: 2008-11-27
SCOTT SEAN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0004]The marine propulsion system according to the invention includes a submersible housing containing a brushless electric motor having a longitudinal drive shaft extending from the housing. An external propeller is connected directly to the drive shaft for rotation by the motor. Preferably, the motor produces a high torque output with reduced energy consumption. It includes a cylindrical stator having a longitudinal axis and defining a chamber in which a rotor is coaxially arranged. The drive shaft is connected w

Problems solved by technology

However, they are noisy and contribute to pollution of the body of water on which the vessel is used.
Accordingly, many bodies of water restrict the size of the gas powered motors allowed or e

Method used

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Embodiment Construction

[0014]The marine propulsion system according to the invention will first be described with reference to FIGS. 1-3. As shown therein, the system includes a control assembly 2, a bracket 4 for mounting the system to a vessel such as the transom of a boat, a shaft 6 connected with the mounting bracket, and a submersible housing 8. Within the housing is mounted a brushless electric motor 10 and a variable voltage controller 12 for the motor. The motor has a drive shaft 14 which extends from the housing along a longitudinal axis thereof, and a propeller 16 is connected directly with the drive shaft. No transfer linkage is required between the motor and the propeller.

[0015]The housing has a curved nose portion 18 at the forward end in the direction of travel so that the housing passes smoothly through the water and sheds debris. Rearwardly, the housing includes a nozzle 20 which preferably has a truncated conical configuration and surrounds the propeller as shown in FIGS. 1 and 3. The noz...

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Abstract

A marine propulsion device such as an outboard motor includes a submersible electric motor having a propeller connected directly with the drive shaft of the motor. The motor is an efficient brushless motor having symmetrical elliptical coils connected with a stator which generate magnetic flux when current is passed through the coils to rotate a rotor for driving the drive shaft. The motor is arranged in a housing having a nozzle connected with a rear portion thereof which surrounds the propeller to reduce cavitation. Cooling fins are provided on the outer surface of the housing to assist with cooling the motor and a motor controller arranged in the housing.

Description

BACKGROUND OF THE INVENTION[0001]The present invention relates to a marine propulsion system in the form of an outboard motor. Such motors have been used for many years to propel small vessels on protected bodies of water. The most common types of outboard motors are gas and electric. Internal combustion engines which rely on gas for fuel provide greater horsepower. However, they are noisy and contribute to pollution of the body of water on which the vessel is used. Accordingly, many bodies of water restrict the size of the gas powered motors allowed or eliminate them altogether.[0002]Electric outboard motors are much cleaner and quieter than gas powered motors. They are particularly useful for propelling rowboats and fishing boats to maneuver the boats in shallow water and around submerged obstacles such as fallen trees. The main drawbacks with electric outboard motors are the limitation in horsepower, the amount of current required to operate them, and the heat generated by the mo...

Claims

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Application Information

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IPC IPC(8): B63H21/17B63H20/08B63H21/21B63H25/06B63H1/18
CPCB63H5/14B63H20/007Y02T70/5272Y02T70/50
Inventor SCOTT, SEAN
Owner SCOTT SEAN
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