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Title: Electric propulsion motor for marine vehicles

Abstract

An electric propulsion motor for marine vehicles is described comprising: a disk-shaped rotor and two coaxial disk-shaped stators, the rotor being separated from each of the stators in an axial direction by an air gap; the rotor including a plurality of permanent magnets that produce a first magnetic field; each stator comprising an armature winding that is connected to a source of electrical current to produce a second magnetic field, the first and second magnetic fields being capable of interacting to create an electromagnetic torque; means for coupling the rotor to a propeller shaft for transferring the torque from the rotor to the shaft, and means for detecting the angle of the shaft; a current control means for receiving a current control signal and for employing pulse width modulation to control the source of electrical current; the current control means including means for storing compensation information related to torque variations that are a function of shaft angle; the current control means further including means connected and responsive to the shaft angle detecting means for selecting the compensation information as a function of shaft angle and means for combining the compensation information with the current control signal to control the sourcemore » of electrical current such that the torque variations that are a function of shaft angle are minimized; and wherein the means for coupling the rotor to the propeller shaft includes means within the motor for isolating the shaft from sound produced by the motor.« less

Inventors:
; ; ;
Publication Date:
OSTI Identifier:
6312996
Patent Number(s):
US 5229677; A
Application Number:
PPN: US 7-764505
Assignee:
Newport News Shipbuilding and Dry Dock Co., VA (United States) IMS; EDB-93-105810
Resource Type:
Patent
Resource Relation:
Patent File Date: 18 Sep 1991
Country of Publication:
United States
Language:
English
Subject:
33 ADVANCED PROPULSION SYSTEMS; PROPULSION SYSTEMS; ELECTRIC MOTORS; SHIPS; ELECTROMAGNETS; MECHANICAL SHAFTS; MECHANICAL VIBRATIONS; NOISE POLLUTION; PERMANENT MAGNETS; ROTORS; SPEED REGULATORS; STATORS; CONTROL EQUIPMENT; ELECTRICAL EQUIPMENT; ENGINES; EQUIPMENT; MACHINE PARTS; MAGNETS; MOTORS; POLLUTION; SHAFTS; 330300* - Advanced Propulsion Systems- Electric-Powered Systems

Citation Formats

Dade, T.B., Leiding, K.W., Mongeau, P.P., and Piercey, M.S. Electric propulsion motor for marine vehicles. United States: N. p., 1993. Web.
Dade, T.B., Leiding, K.W., Mongeau, P.P., & Piercey, M.S. Electric propulsion motor for marine vehicles. United States.
Dade, T.B., Leiding, K.W., Mongeau, P.P., and Piercey, M.S. 1993. "Electric propulsion motor for marine vehicles". United States. doi:.
@article{osti_6312996,
title = {Electric propulsion motor for marine vehicles},
author = {Dade, T.B. and Leiding, K.W. and Mongeau, P.P. and Piercey, M.S.},
abstractNote = {An electric propulsion motor for marine vehicles is described comprising: a disk-shaped rotor and two coaxial disk-shaped stators, the rotor being separated from each of the stators in an axial direction by an air gap; the rotor including a plurality of permanent magnets that produce a first magnetic field; each stator comprising an armature winding that is connected to a source of electrical current to produce a second magnetic field, the first and second magnetic fields being capable of interacting to create an electromagnetic torque; means for coupling the rotor to a propeller shaft for transferring the torque from the rotor to the shaft, and means for detecting the angle of the shaft; a current control means for receiving a current control signal and for employing pulse width modulation to control the source of electrical current; the current control means including means for storing compensation information related to torque variations that are a function of shaft angle; the current control means further including means connected and responsive to the shaft angle detecting means for selecting the compensation information as a function of shaft angle and means for combining the compensation information with the current control signal to control the source of electrical current such that the torque variations that are a function of shaft angle are minimized; and wherein the means for coupling the rotor to the propeller shaft includes means within the motor for isolating the shaft from sound produced by the motor.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = 1993,
month = 7
}
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  • An electric propulsion and braking system which includes a plurality of high-speed, dc commutatorless motors each coupled to a wheel of an automotive vehicle through an associated fixedratio mechanical transmission. Each motor includes a field winding, an armature winding, and a commutation circuit for the armature winding. During propulsion, each commutation circuit is enabled and, during braking, each commutation circuit is disabled. Control of the amount of propulsion and braking is afforded by varying the dc source voltage across each commutation circuit and by varying the field current in each field winding. The dc source voltage across each commutation circuitmore » is varied by connecting the commutation circuits and a plurality of main electrical energy sources in selected series, series/parallel, and parallel combinations. The field current in each field winding is varied by connecting the field windings with an auxiliary electrical energy source in selected series, series/parallel and parallel combinations, and by duty-cycling the selected combination. The various series, series/parallel and parallel combinations are selected by, and the duty-cycling of the selected field winding combination is controlled by, a microprocessor receiving signals representing the magnitude of electrical energy transfer between the main electrical energy sources and the motors, the position of an acceleration pedal, the position of a brake pedal, the velocity of the vehicle, the dc source voltage across each commutation circuit, and the armature voltage across each armature winding.« less
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