Synchronous motors according to the invention operate at higher efficiency, with lower cost, reduced mass and reduced cogging. Magnet dimensions are selected that reduce cogging forces to a negligible amount even though there are fewer slots than normal. Optionally, it is possible to use non-overlap
Synchronous motors according to the invention operate at higher efficiency, with lower cost, reduced mass and reduced cogging. Magnet dimensions are selected that reduce cogging forces to a negligible amount even though there are fewer slots than normal. Optionally, it is possible to use non-overlapping windings with deeper and open slots. The approach is applicable to both rotary and linear motors and motors using either permanent magnets or electromagnets in the field structure. It is particularly relevant to linear or rotary motors that have a large air gap, and to small motors that must deliver a high ratio of thrust or torque to motor mass.
대표청구항▼
1. In a synchronous motor comprising one or more field structures and one or more armatures, the field structures having poles for generating a magnetic field and the armatures having teeth with slots therebetween and coil windings disposed in those slots, the improvement whereinA. extensions are ab
1. In a synchronous motor comprising one or more field structures and one or more armatures, the field structures having poles for generating a magnetic field and the armatures having teeth with slots therebetween and coil windings disposed in those slots, the improvement whereinA. extensions are absent from tips of a plurality of said poles, B. said coil windings comprise a succession of coil windings, none of which overlaps a next immediate coil winding in the succession, C. each of a plurality of said coil windings are pre-wound prior to being disposed in said slots, D. a relative dimension of pales to teeth, along a relative direction of motion of the poles to the teeth, is selected so as in substantially null a lowest harmonic term of a cogging force that results from interaction of the magnetic field and the armature and that is proportional to a square of the magnetic field strength, and E. a half-pole is provided at the end of at least one field structure. 2. In a synchronous motor comprising one or more field structures and one or more armatures, the field structures having poles for generating a magnetic field and the armatures having teeth with slots therebetween and coil windings disposed in those slots, the improvement whereinA. each of a plurality of said coil windings are pre-wound prior to being disposed in said slots, B. each of a plurality of said coil windings does not overlap an adjacent coil winding disposed in the slots, C. a relative dimension of poles to teeth, along a direction of motion of the poles relative to the teeth, is selected so as to minimize a lowest harmonic term of a force that results from interaction of the magnetic field and the armature that is proportional to a square of the magnetic field strength, and D. a half-pole is provided at the end of at least one field structure. 3. In a synchronous motor comprising one or more field structures and one or more armatures, the field structures having poles for generating a magnetic field and the armatures having teeth with slots therebetween and coil windings disposed in those slots, the improvement whereinA. extensions are absent from tips of a plurality of said poles, B. said coil windings comprise a succession of coil windings, none of which overlaps a next immediate coil winding in the succession, C. each of a plurality of said coil windings are pre-wound prior to being disposed in said slots, D. a relative dimension of poles to teeth, along a relative direction of motion of the poles to the teeth, is selected so as to substantially null a lowest harmonic term of a cogging force that results from interaction of the magnetic field and the armature and that is proportional to a square of the magnetic field strength, and E. the further improvement wherein the poles define a magnetic field of length λ, and wherein the poles of at least one field structure are arranged in a Halbach Array, and wherein, for those poles of that structure generating a magnetic field perpendicular to the air gap, a ratio of magnet length to λ/2 is substantially 0.35:1 or 0.67:1. 4. In a synchronous motor comprising one or more field structure and one or more armatures, the field structures having poles for generating a magnetic field and the armatures having teeth with slots therebetween and coil windings disposed in those slots, the improvement whereinA. extensions are absent from tips of a plurality of said poles, B. said coil windings comprise a succession of coil windings, none of which overlaps a next immediate coil winding in the succession, C. each of a plurality of said coil windings are pre-wound prior to being disposed in said slots, D. a relative dimension of poles to teeth, along a relative direction of motion of the poles to the teeth, is selected so as to substantially null a lowest harmonic term of a cogging force that results from interaction of the magnetic field and the armature and that is proportional to a square of the magnetic field strength, and E. the further improvement wherein the poles define a magnetic field of wavelength λ, and wherein a ratio of magnet length along the relative direction of motion to λ/2 is substantially 0.77:1 or 0.45:1. 5. In a synchronous motor comprising one or more field structures and one or more armatures, the field structures having poles for generating a magnetic field and the armatures having teeth with slots therebetween and coil windings disposed in those slots, the improvement whereinA. extensions are absent from tips of a plurality of said poles, B. said coil windings comprise a succession of coil windings, none of which overlaps a next immediate coil winding in the succession, C. each of a plurality of said coil windings are pre-wound prior to being disposed in said slots, D. a relative dimension of poles to teeth, along a relative direction of motion of the poles to the teeth, is selected so as to substantially null a lowest harmonic term of a cogging force that results from interaction of the magnetic field and the armature and that is proportional to a square of the magnetic field strength, and E. the further improvement wherein a pole at the end of at least one field structure is arranged so as to minimize a third force harmonic between the field structure and the armature without increasing a sixth harmonic therebetween. 6. In a synchronous motor comprising one or more field structures and one or more armatures, the field structures having poles for generating a magnetic field and the armatures having teeth with slots therebetween and coil windings disposed in those slots, the improvement whereinA. extensions are absent from tips of a plurality of said poles, B. said coil windings comprise a succession of coil windings, none of which overlaps a next immediate coil winding in the succession, C. each of a plurality of said coil windings are pre-wound prior to being disposed in said slots, D. a relative dimension of poles to teeth, along a relative direction of motion of the poles to the teeth, is selected so as to substantially null a lowest harmonic term of a cogging force that results from interaction of the magnetic field and the armature and that is proportional to a square of the magnetic field strength, and E. wherein the poles of the field structures define a magnetic field of wavelength λ, the further improvement wherein relative dimensions of the field structure are selected in substantial accord with the following table: ParameterDimensionWavelength60Magnetic gap4Length of periodic magnets23Height of periodic magnets5Length of end magnet14Height of end magnets4Spacing between end magnets and neighbor-11ing magnet.7. In a synchronous motor comprising one or more field structures and one or more armatures, the field structures having poles for generating a magnetic field and the armatures having teeth with slots therebetween and coil windings disposed in those slots, the improvement whereinA. each of a plurality of said coil windings are pre-wound prior to being disposed in said slots, B. each of a plurality of said coil windings does not overlap an adjacent coil winding disposed in the slots, C. a relative dimension of poles to teeth, along a direction of motion of the poles relative to the teeth, is selected so as to minimize a lowest harmonic term of a force that results from interaction of the magnetic field and the armature that is proportional to a square of the magnetic field strength, and D. the further improvement wherein the poles define a magnetic field of length λ, and wherein the poles of at least one field structure are arranged in a Halbach Array, and wherein, for those poles of that structure generating a magnetic field perpendicular to the air gap, a ratio of magnet length to λ/2 is substantially 0.35:1 or 0.67:1. 8. In a synchronous motor comprising one or more field structures and one or more armatures, the field structures having poles for generating a magnetic field and the armatures having teeth with slots therebetween and coil windings disposed in those slots, the improvement whereinA. each of a plurality of said coil windings are pre-wound prior to being disposed in said slots, B. each of a plurality of said coil windings does not overlap an adjacent coil winding disposed in the slots, C. a relative dimension of poles to teeth, along a direction of motion of the poles relative to the teeth, is selected so as to minimize a lowest harmonic term of a force that results from interaction of the magnetic field and the armature that is proportional to a square of the magnetic field strength, and D. wherein the poles define a magnetic field of wavelength λ, and wherein a ratio of magnet length along the relative direction of motion to λ/2 is substantially 0.77:1 or 0.45:1. 9. In a synchronous motor comprising one or more field structures and one or more armatures, the field structures having poles for generating a magnetic field and the armatures having teeth with slots therebetween and coil windings disposed in those slots, the improvement whereinA. each of a plurality of said coil windings are pre-wound prior to being disposed in said slots, B. each of a plurality of said coil windings does not overlap an adjacent coil winding disposed in the slots, C. a relative dimension of poles to teeth, along a direction of motion of the poles relative to the teeth, is selected so as to minimize a lowest harmonic term of a force that results from interaction of the magnetic field and the armature that is proportional to a square of the magnetic field strength, and D. the further improvement wherein a polo at the end of at least one field structure is arranged so as to minimize a third force harmonic between the field structure and the armature without increasing a sixth harmonic therebetween. 10. In a synchronous motor comprising one or more field structures and one or more armatures, the field structures having poles for generating a magnetic field and the armatures having teeth with slots therebetween and coil windings disposed in those slots, the improvement whereinA. each of a plurality of said coil windings are pre-wound prior to being disposed in said slots, B. each of a plurality of said coil windings does not overlap an adjacent coil winding disposed in the slots, C. a relative dimension of poles to teeth, along a direction of motion of the poles relative to the teeth, is selected so as to minimize a lowest harmonic term of a force that results from interaction of the magnetic field and the armature that is proportional to a square of the magnetic field strength, and D. wherein the poles of the field structures define a magnetic field of wavelength λ, the further improvement wherein relative dimensions of the field structure are selected in substantial accord with the following table: ParameterDimensionWavelength60Magnetic gap4Length of periodic magnets23Height of periodic magnets5Length of end magnet14Height of end magnets4Spacing between end magnets and neighbor-11ing magnet.
연구과제 타임라인
LOADING...
LOADING...
LOADING...
LOADING...
LOADING...
이 특허에 인용된 특허 (78)
Perreault Brian M. ; Clark Tracy M., Accurate position-sensing and communications for guideway operated vehicles.
DiFonso Gene (Arlington TX) Staehs Joel L. (DeSoto TX) Kemp Charles A. (Richardson TX) Bortzfield ; deceased William C. (late of Grand Prarie TX by Beverly J. Bortzfield ; executor), Direction control assembly for a material handling car having pivoted divert aims engaging tracks for guidance in switch.
Wilson John F. (Woodland Hills CA) Hoover Edward D. (Woodland Hills CA) Hammond Philip K. (Woodland Hills CA) Moshier William A. (Arleta CA) Woodell Jack L. (La Canada CA) Spaniol John W. (Studio Cit, Distributed processing telex exchange.
He Jianliang (Naperville IL) Rote Donald M. (Lagrange IL), Double row loop-coil configuration for high-speed electrodynamic maglev suspension, guidance, propulsion and guideway di.
Weinberger Bernard R. (Avon CT) Lynds ; Jr. Lahmer (Glastonbury CT) Hull John R. (Hinsdale IL), Flywheel energy storage with superconductor magnetic bearings.
Boys John T. (15A Island Bay Road Birkdale ; Auckland 10 NZX) Green Andrew W. (15 McDonald Road Papatoetoe ; Auckland NZX), Inductive power pick-up coils.
Berdut Elberto (Orquidea No. 98 ; Santa Maria Santa Mario ; Guaynabo PRX 00926), Levitation and propulsion system using permanent magnets and interleaved iron or steel.
Shibata Satoru (Komaki JPX) Murayama Shigeto (Komaki JPX), Magnetic levitation transport system with non-contact inductive power supply and battery charging.
DiFonso Gene (Arlington TX) Staehs Joel L. (DeSoto TX), Material handling car and track assembly having opposed magnet linear motor drive and opposed permanent magnet brake ass.
Kneifel ; II R. William (Cincinnati OH) Walsh Stephen T. (Cincinnati OH) Minnich Thomas W. (Franklin OH) Crovella Robert M. (Rockford IL) Morser A. Harold (Oxon GB2), Method and apparatus for torque ripple compensation.
Malewicki Douglas J. (14962 Merced Cir. Irvine CA 92714) Baker Frank J. (3881 Banyan St. Irvine CA 92714), Passenger transportation system for self-guided vehicles.
Staehs Joel L. (DeSoto TX) DiFonso Gene (Arlington TX) Bortzfield ; deceased William C. (late of Grand Prairie TX by Beverly J. Bortzfield ; executrix), Synchronous drive and braking means for material handling car.
Richard D. Thornton ; Brian M. Perreault ; Tracy M. Clark, System for inductive transfer of power, communication and position sensing to a guideway-operated vehicle.
Staehs Joel L. (DeSoto TX) Kemp Charles A. (Richardson TX) DiFonso Gene (Arlington TX) Bortzfield William C. (late of Grand Prairie TX by Beverly J. Bortzfield ; executrix), Track for material handling car and car wheel assembly for cooperation therewith.
Ansorge Ulrich,DEX ; Wunderlich Horst,DEX ; Aldinger Michael,DEX ; Seelig Anton,DEX ; Huder Bernhard,DEX, Track-guided transport system with power and data transmission.
Kitamura, Masashi; Tajima, Fumio; Akami, Yusuke; Utsumi, Noriyuki; Nakamura, Ken; Shibahara, Kazuaki, Cylindrical linear motor and a vehicle using the same.
Paulides, Johannes Jacobus Hubertus; Vandenput, André Jean Adolf; Van Leeuwen, Bernie G.; Lomonova, Elena Andreevna, Magnetic spring, a spring and damper assembly, and a vehicle including the spring.
King, Nathanael N.; Perreault, Brian M.; Clark, Tracy M.; Thornton, Richard D.; Young, Jason; Bottasso, Michael W.; Mendenhall, Jesse, Short block linear synchronous motors and switching mechanisms.
King, Nathanael N.; Perreault, Brian M.; Clark, Tracy M.; Thornton, Richard D.; Young, Jason; Bottasso, Michael W., Transport system powered by short block linear synchronous motors.
King, Nathanael N.; Perreault, Brian M.; Clark, Tracy M.; Thornton, Richard D.; Young, Jason; Bottasso, Michael W., Transport system powered by short block linear synchronous motors.
King, Nathanael N.; Perreault, Brian M.; Clark, Tracy M.; Thornton, Richard D.; Young, Jason; Bottasso, Michael W., Transport system powered by short block linear synchronous motors.
King, Nathanael N.; Perreault, Brian M.; Clark, Tracy M.; Thornton, Richard D.; Young, Jason; Bottasso, Michael W., Transport system powered by short block linear synchronous motors and switching mechanism.
King, Nathanael N.; Perreault, Brian M.; Clark, Tracy M.; Thornton, Richard D.; Young, Jason; Bottasso, Michael W.; Mendenhall, Jesse, Transport system powered by short block linear synchronous motors and switching mechanism.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.