Slotless PM brushless motor with helical edge-wound laminations
Slotless PM brushless motor with helical edge-wound laminations
This paper discusses the analysis and design of a very thin slotless permanent-magnet (PM) brushless motor whose stator laminations are manufactured from a single strip of steel that is edge wound into a spiral (like a "slinky") and then fitted over the windings that are preformed on the outside surface of a nonconducting former. Analytical and finite-element analysis (FEA) were used to determine the constrained optimum dimensions of a motor used to drive a rim-driven thruster in which the motor rotor is fitted onto the rim of the propeller and the stator is encapsulated in the thin Kort nozzle of the thruster. This paper describes the fabrication of a demonstrator motor and presents experimental results to validate the theoretical calculations. Experimental motor performance results are also reported and compared with those of a slotted motor that fits within the same active radial dimensions as the slotless motor. The slotless motor, which has longer active length and endwindings, and thicker magnets than the slotted motor, was found to be less efficient and more expensive (prototype cost) than the slotted machine.
edge-wound laminations, rim-driven thruster, slinky laminations, slotless brushless pm motor
594-598
Sharkh, S.M.
c8445516-dafe-41c2-b7e8-c21e295e56b9
Lai, S.H.
9ee819cd-2ace-4c3f-bb76-78c135c048cb
September 2009
Sharkh, S.M.
c8445516-dafe-41c2-b7e8-c21e295e56b9
Lai, S.H.
9ee819cd-2ace-4c3f-bb76-78c135c048cb
Sharkh, S.M. and Lai, S.H.
(2009)
Slotless PM brushless motor with helical edge-wound laminations.
IEEE Transactions on Energy Conversion, 24 (3), .
(doi:10.1109/TEC.2009.2025423).
Abstract
This paper discusses the analysis and design of a very thin slotless permanent-magnet (PM) brushless motor whose stator laminations are manufactured from a single strip of steel that is edge wound into a spiral (like a "slinky") and then fitted over the windings that are preformed on the outside surface of a nonconducting former. Analytical and finite-element analysis (FEA) were used to determine the constrained optimum dimensions of a motor used to drive a rim-driven thruster in which the motor rotor is fitted onto the rim of the propeller and the stator is encapsulated in the thin Kort nozzle of the thruster. This paper describes the fabrication of a demonstrator motor and presents experimental results to validate the theoretical calculations. Experimental motor performance results are also reported and compared with those of a slotted motor that fits within the same active radial dimensions as the slotless motor. The slotless motor, which has longer active length and endwindings, and thicker magnets than the slotted motor, was found to be less efficient and more expensive (prototype cost) than the slotted machine.
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Published date: September 2009
Keywords:
edge-wound laminations, rim-driven thruster, slinky laminations, slotless brushless pm motor
Identifiers
Local EPrints ID: 73539
URI: http://eprints.soton.ac.uk/id/eprint/73539
ISSN: 0885-8969
PURE UUID: e8d3dfa4-a791-4719-83d9-3b9f4d1c05d9
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Date deposited: 15 Mar 2010
Last modified: 14 Mar 2024 02:38
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Author:
S.H. Lai
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