Electric motor having segmented stator windings
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04D-025/06
F04D-025/08
F04D-013/06
F04D-029/58
H02K-001/20
H02K-009/06
H02K-003/00
H02K-001/14
출원번호
US-0388577
(2010-07-01)
등록번호
US-9470238
(2016-10-18)
우선권정보
BE-2009/0725 (2009-11-24)
국제출원번호
PCT/BE2010/000049
(2010-07-01)
§371/§102 date
20120202
(20120202)
국제공개번호
WO2011/014934
(2011-02-10)
발명자
/ 주소
Vande Sande, Hans
Philippi, Cornelis Theodorus
Pahner, Uwe
출원인 / 주소
ATLAS COPCO AIRPOWER, NAAMLOZE VENNOOTSCHAP
대리인 / 주소
Bacon & Thomas, PLLC
인용정보
피인용 횟수 :
0인용 특허 :
62
초록▼
A turbocompressor system including a high speed motor (10) including a rotor (12) mounted in a rotative manner relative to the stator, wherein on the rotor (12) one or more impellers (11) are directly fixed, the stator including active motor structures and a shell (7), including a ferromagnetic stat
A turbocompressor system including a high speed motor (10) including a rotor (12) mounted in a rotative manner relative to the stator, wherein on the rotor (12) one or more impellers (11) are directly fixed, the stator including active motor structures and a shell (7), including a ferromagnetic stator core (6) and a winding being constructed as toroidally wound coils (5), the shell (7) is constructed in such a manner as to create additional open space between the stator core (6) and the shell (7), constituting a cooling channel (15) through which process gas is passed axially for directly cooling the active motor structures and the rotor (12), prior to compression by the one or more impellers (11).
대표청구항▼
1. A turbocompressor system comprising: a high speed motor having a number of phases larger than one, and comprising a stator and a rotor mounted in a rotative manner relative to said stator, wherein on said rotor one or more impellers are directly fixed;said stator comprising active motor structure
1. A turbocompressor system comprising: a high speed motor having a number of phases larger than one, and comprising a stator and a rotor mounted in a rotative manner relative to said stator, wherein on said rotor one or more impellers are directly fixed;said stator comprising active motor structures and a shell;said active motor structures comprising a ferromagnetic stator core and a winding, said ferromagnetic stator core comprising a plurality of stator core segments connected along side edges of said stator core segments to form said ferromagnetic stator core, said winding being constructed as a series of toroidal coils which are mounted around a length of each stator core segment extending in the axial direction of the rotor and said coils being physically separated from one another and from the rotor so as to form a first open space;each of said stator core segments comprising at least one outwardly directed extension extending from each of said stator core segments;said shell being constructed so as to create at least a second open space between said ferromagnetic stator core and said shell;said first and second open spaces defining a cooling channel confined on the inside by said rotor and the ferromagnetic stator core and confined on the outside by said ferromagnetic stator core and the shell;said cooling channel being configured in a way such that the cooling channel serves as a duct through which process gas is passed axially for directly cooling said active motor structures and the rotor prior to compression by said one or more impellers. 2. The turbocompressor system according to claim 1, wherein said ferromagnetic stator core has a polygonal shape. 3. The turbocompressor system according to claim 1, wherein said ferromagnetic stator core has a cylindrical tubular shape. 4. The turbocompressor system according to claim 1, wherein said ferromagnetic stator core is constructed as stack of single piece ferromagnetic laminations. 5. The turbocompressor system according to claim 1, wherein each core segment is constructed as a stack of soft magnetic non-oriented or grain-oriented steel laminations, amorphous or nanocrystalline ribbons. 6. The turbocompressor system according to claim 1, wherein each core segment is constructed as one of a sintered soft-magnetic powder, soft-magnetic composite or ferrite part. 7. The turbocompressor system according to claim 1, wherein each of the plurality of core segments is constructed as one of the sintered soft-magnetic powder or soft-magnetic composite, and wherein the particle size of the sintered soft-magnetic powder or sintered soft-magnetic composite is smaller than 500 μm. 8. The turbocompressor system according to claim 1, wherein each of the outward extensions are provided along one of the side edges of each of the stator core segments. 9. The turbocompressor system according to claim 8, wherein said outward extensions are integral parts of said ferromagnetic stator core. 10. The turbocompressor system according to claim 8, wherein said outward extensions are formed as separate parts rigidly attached to said ferromagnetic stator core. 11. The turbocompressor system according to claim 8, wherein said toroidal coil is mounted on a free edge of said stator core segment. 12. The turbocompressor system according to claim 1, wherein said outward extensions define a connection between said ferromagnetic stator core and said shell. 13. The turbocompressor system according to claim 12, wherein said shell is constructed as a sleeve wound around said outward extensions. 14. The turbocompressor system according to claim 1, wherein said shell is constructed as a single solid piece. 15. The turbocompressor system according to claim 1, wherein said shell is constructed from a plurality of segments. 16. The turbocompressor system according to claim 1, wherein the number of said coils is an integer of said number of phases. 17. The turbocompressor system according to claim 1, wherein said coils are wound with stranded conductors. 18. The turbocompressor system according to claim 1, wherein said coils are wound with Litz-type conductors. 19. The turbocompressor system according to claim 1, wherein said coils are directly wound over said ferromagnetic stator core. 20. The turbocompressor system according to claim 1, wherein said coils are directly wound over said core segments. 21. The turbocompressor system according to claim 1, wherein said coils are pre-wound on electrically insulating bobbins before being slid over and fixed to said core segments. 22. The turbocompressor system according to claim 1, wherein said winding is a single-layer winding. 23. The turbocompressor system according to claim 1, wherein said winding is a multiple-layer winding. 24. The turbocompressor system according to claim 1, wherein said rotor comprises permanent magnets that enable synchronous operation with the rotating magnetic field generated by currents in said winding in said stator. 25. The turbocompressor system according to claim 1, wherein one impeller is fixed to said rotor in such a manner that process gas flows into said impeller after having passed through said cooling channel. 26. The turbocompressor system according to claim 1, wherein the number of said coils is a fractional multiple of said number of phases. 27. The turbocompressor according to claim 1 wherein each stator core segment has a first leg and a second leg, wherein said first leg comprises the at least one outwardly directed extension extending from the stator core segment, and said second leg comprises the toroidal coil. 28. The turbocompressor according to claim 1, wherein at least one outward extension extends along both side edges of said stator core segments and said toroidal coil is mounted around a middle part of the stator core segment between the side edges. 29. A method for constructing a turbocompressor system, said method comprising the steps of: providing a stator of an electric motor;providing a shaft of a rotor of an electric motor, that is rotated by a rotating magnetic field generated in said stator;mounting one or more impellers on the shaft of said rotor in such a manner that, during operation of the turbocompressor system, process gas is compressed after having passed through the motor for directly cooling active motor structures prior to compression;assembling said stator comprising active motor structures and a shell, said active motor structures comprising a ferromagnetic stator core and a winding, wherein said assembling comprises connecting a plurality of stator core segments along side edges of said stator core segments to form said ferromagnetic stator core, said winding being constructed as a series of coils which are toroidally formed around a length of each stator core segment extending in the axial direction of the rotor and which are physically separated from each other and the rotor so as to form an open space, wherein each of said stator segments comprise at least one outwardly directed extension extending from each of said stator core segments; andarranging said shell so as to create additional open space. 30. The method according to claim 29, said method further comprising the steps of: arranging said shell so as to retain said ferromagnetic stator core via radial forces applied by said shell on said outward extensions. 31. A method for constructing a turbocompressor system, said method comprising the steps of: providing a stator of an electric motor;providing a shaft of a rotor of an electric motor, that is rotated by a rotating magnetic field generated in said stator;mounting one or more impellers on the shaft of said rotor in such a manner that, during operation of the turbocompressor system, process gas is compressed after having passed through the motor for directly cooling active motor structures prior to compression;assembling said stator comprising active motor structures and a shell, said active motor structures comprising a ferromagnetic stator core and a winding, wherein said assembling comprises connecting a plurality of stator core segments along side edges of said stator core segments to form said ferromagnetic stator core, said winding being constructed as a series of coils which are toroidally formed around a length of each stator core segment extending in the axial direction of the rotor and which are physically separated from each other and the rotor so as to form an open space; andarranging said shell so as to create additional open space, andsaid method further comprising the steps of:providing said stator with outward extensions;arranging said shell so as to retain said ferromagnetic stator core via radial forces applied by said shell on said outward extensions, andfurther comprising the step winding a flexible material around the outward extension to provide prestress by applying radial force on the outward extensions to automatically retain the ferromagnetic stator core. 32. A turbocompressor system comprising: a high speed motor having a number of phases larger than one, and comprising a stator and a rotor mounted in a rotative manner relative to said stator, wherein on said rotor one or more impellers are directly fixed;said stator comprising active motor structures and a shell;said active motor structures comprising a ferromagnetic stator core and a winding, said ferromagnetic stator core comprising a plurality of stator core segments connected along side edges of said stator core segments to form said ferromagnetic stator core, said winding being constructed as a series of toroidal coils, wherein each toroidal coil is mounted around a length of each stator core segment extending in the axial direction of the rotor and said coils being physically separated from one another and from the rotor so as to form a first open space;each of said stator core segments comprising at least one inwardly directed extension extending from each of said stator core segments;said shell being constructed so as to create at least a second open space between said ferromagnetic stator core and said shell;said first and second open spaces defining a cooling channel confined on the inside by said rotor and the ferromagnetic stator core and confined on the outside by said ferromagnetic stator core and the shell;said cooling channel being configured in a way such that the cooling channel serves as a duct through which process gas is passed axially for directly cooling said active motor structures and the rotor prior to compression by said one or more impellers. 33. The turbocompressor system according to claim 32, wherein said inward extensions are formed as integral parts of said ferromagnetic stator core. 34. The turbocompressor system according to claim 32, wherein said inward extensions are formed as separate parts rigidly attached to said stator core.
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