Electric propulsion motor for marine vehicles
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.
- Assignee:
- Newport News Shipbuilding and Dry Dock Co., VA (United States)
- Patent Number(s):
- US 5229677; A
- Application Number:
- PPN: US 7-764505
- OSTI ID:
- 6312996
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
330300* -- Advanced Propulsion Systems-- Electric-Powered Systems
CONTROL EQUIPMENT
ELECTRIC MOTORS
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
ENGINES
EQUIPMENT
MACHINE PARTS
MAGNETS
MECHANICAL SHAFTS
MECHANICAL VIBRATIONS
MOTORS
NOISE POLLUTION
PERMANENT MAGNETS
POLLUTION
PROPULSION SYSTEMS
ROTORS
SHAFTS
SHIPS
SPEED REGULATORS
STATORS