Design of a high power density, permanent magnet, axial gap dc motor

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:7022452

Hawsey, R A; Daniel, D S; Thomas, R J ^[1]; Bailey, J M ^[2]

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1. Oak Ridge National Lab., TN (USA)
2. Tennessee Univ., Knoxville, TN (USA)

In the design of drive motors for undersea vehicles, the premium placed on noise suppression suggests the use of a brush-commutated dc motor. The additional constraints of weight and volume, as well as unusual configuration, presents the axial air-gap configuration, with a permanent magnet field, as a viable candidate. In such a configuration the design of the brushes and commutator and the resulting structure becomes critical. The report describes a novel solution to this problem. The basic motor consists of two discs containing permanent magnets on either side of a magnetic structure containing the copper windings. An advantage of this motor concept is that copper cooling may easily be accomplished through the use of liquid circulating through the stator windings. The role of field and armature in a conventional disc motor configuration are reversed. The two discs containing the permanent magnets are rotating. The brushes are on the discs. The magnetic structure with the coils is stationary. The commutator bars are imbedded in the stationary member. Input power is supplied to the brushes through a brush-and-slip ring assembly. An electromagnetic design analysis for a 92 ft-lb, 700 rpm motor was performed. A finite element analysis has been conducted and the results show that magnetic saturation is not a limiting factor in this design. The motor torque is achievable within weight and volume constraints. 9 figs., 1 tab.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: USDOD
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 7022452
• Report Number(s): CONF-900464-2; ON: DE90005449
• Resource Relation: Conference: IEEE Southeastcon, New Orleans, LA (USA), 1-4 Apr 1990
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
42 ENGINEERING
ELECTRIC MOTORS
DESIGN
CONTROL SYSTEMS
COOLING SYSTEMS
COPPER
DIRECT CURRENT
ELECTROMAGNETIC FIELDS
ENERGY EFFICIENCY
EXPERIMENTAL DATA
FORECASTING
FREQUENCY ANALYSIS
PERFORMANCE TESTING
PERMANENT MAGNETS
RESEARCH PROGRAMS
SATURATION
SUBMARINES
CURRENTS
DATA
EFFICIENCY
ELECTRIC CURRENTS
ELEMENTS
ENERGY SYSTEMS
INFORMATION
MAGNETS
METALS
MOTORS
NUMERICAL DATA
SHIPS
TESTING
TRANSITION ELEMENTS
320204* - Energy Conservation
Consumption
& Utilization- Transportation- Sea & Water
423000 - Engineering- Marine Engineering- (1980-)
426000 - Engineering- Components
Electron Devices & Circuits- (1990-)