Description:A STATOR ASSEMBLY FOR HIGH TEMPERATURE SUPERCONDUCTING SYNCHORNOUS MACHINE

FIELD OF THE INVENTION
[0001] The present subject matter described herein relates to a high temperature superconducting machine. More specifically, the present invention relates to a stator assembly for a high temperature superconducting (HTS) synchronous machine that generates higher magnetic fields without magnetic saturation of teeth. The present invention also reduces the overall size and weight of the HTS synchronous machine. Also, the cylindrical geometry and presence of composite teeth helps in considerably reducing the noise and vibration of HTS synchronous machine.

BACKGROUND OF THE INVENTION
[0002] Background description includes information that may be useful in understanding the present invention. It is not an admission that any of the information provided herein is prior art or relevant to the presently claimed invention, or that any publication specifically or implicitly referenced is prior art.
[0003] The High Temperature Superconducting (HTS) synchronous machines use HTS tape or HTS wire in either rotor or stator or both depending on the selected topology for the machine. Primarily HTS tape is used in windings and coils of various electrical machines so as to practically reduce the operating copper losses to zero. In case, HTS tape is used only in stator, the cryogenic cooling aspects become simpler, whereas, in case HTS tape is used in rotor coils or rotor windings, the cryogenic cooling becomes complex affair.
[0004] In conventional electrical machines, iron alloy based magnetic material is used as core for stator as well as rotor. This magnetic core limits the operating magnetic field in the machine to material’s magnetic saturation value. Also, the presence of copper based windings in the stator as well as rotor causes certain copper losses thereby limiting the operational efficiency of the electrical machine. Therefore, by using HTS tape in the rotating electrical machines, the operating magnetic field can be increased to a considerably higher value without incurring any additional copper losses.
[0005] Also, the usage of magnetic iron based core in the stator and rotor generates vibrations and the geometry of conventional rotor assembly produces lot of noise arising out of friction and windage in the machine. These vibrations and noise levels can be substantially reduced by using non-magnetic materials in the core and proper geometry selection for the rotor of the machine.
[0006] Thus there exists a need to provide solution for the above mentioned problem.

OBJECTS OF THE DISCLOSURE
[0007] It is therefore the object of the present disclosure to overcome the aforementioned and other drawbacks in prior arts.
[0008] It is a primiary object of the present disclosure to provide a stator assembly for high temperature superconducting (HTS) synchronous machine having HTS coil based air core rotor.
[0009] It is another object of the present disclosure to provide a high temperature superconducting (HTS) synchronous machine having stator winding placed in slots created by composite teeth inserted in the bore of a hollow cylindrical stack of stator iron core laminates.
[0010] It is another object of the present disclosure to provide the HTS synchronous machine in which the stator has a liquid coolant (demineralized water or mixture of ethylene glycol & demineralized water) for ventilation to manage the thermal load of stator winding and stator core along with a forced air ventilation generated by an external blower.
[0011] It is another object of the present disclosure to provide the high temperature superconducting (HTS) synchronous machine with two or higher even multiple (equal to number of poles in the machine) HTS coils placed in a rotating cryostat surrounded by vacuum and provided with drive end (DE) and non-drive end (NDE) torque tubes to transfer the generated electromechanical force to the load.
[0012] It is another object of the present disclosure to provide the HTS synchronous machine in which the HTS coils placed in rotating cryostat are cooled by cold helium gas fed by an external cryocooler in a closed loop manner which is facilitated by a cryogen coupling placed suitably between rotor and stationary cryocooler.
[0013] It is another object of the present disclosure to provide the HTS synchronous machine which operate at very high magnetic fields so that HTS coils of the rotor require lesser ampere-turns and, hence, require lesser length of HTS tape or HTS wire
[0014] It is another object of the present disclosure to provide the HTS synchronous machine having a combination of stator heat exchanger facilitating liquid coolant ventilation and externally mounted blower providing forced air ventilation to have an advantage of maintaining the temperatures of all active components of stator well within insulation class limits for all operating conditions for enhancing the overall thermal behavior along with improving its operational life
[0015] It is another object of the present disclosure to provide very high magnetic fields in HTS synchronous machine with the help of rotor HTS coils so as to reduce the overall size and weight of the machine.
[0016] It is yet another object of the present disclosure to provide the HTS synchronous machine with composite teeth based stator and air core HTS coils based cylindrical rotor having inherently lower noise and vibrations.
[0017] These and other objects and advantages of the present subject matter will be apparent to a person skilled in the art after consideration of the following detailed description taken into consideration with accompanying drawings in which preferred embodiments of the present subject matter are illustrated.

SUMMARY OF THE INVENTION
[0018] One or more drawbacks of conventional systems and process are overcome, and additional advantages are provided through the apparatus/composition and a method as claimed in the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be part of the claimed disclosure.
[0019] Solution to one or more drawbacks of existing technology and additional advantages are provided through the present disclosure. Additional features and advantages are realized through the technicalities of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered to be a part of the claimed disclosure.
[0020] The present disclosure offers a solution in the form of a stator assembly for a high temperature superconducting (HTS) synchronous machine. The stator assembly includes a stator core having multiple stator lamination sector assembled together to form a circular lamination, wherein the stator core has a plurality of composite teeth slot to house multiple composite stator teeth, a slot provided in between the multiple composite stator teeth to house a multi-phase winding, a stator frame along with a ventilation space connected to an outer surface of the stator core using a key slot and a stator heat exchanger mounted at the bottom of the stator frame through a flange via a ventilation duct.
[0021] In an aspect of the invention, the stator assembly has a double-layer multi-phase copper winding placed in the slots created by the multiple composite stator teeth inserted in a bore of a hollow cylindrical stack of circular laminations.
[0022] In a further aspect of the invention, the stator core has multitude of ventilation pipes and radial cooling ducts.
[0023] In an aspect of the invention, multiple HTS coils are placed in a rotating cryostat provided with a drive end and an non drive end shafts.
[0024] In an aspect of the invention, the multiple HTS coils placed in the rotating cryostat are cooled by cold helium gas fed by a cryocooler in a closed loop manner which is facilitated by a cryogen coupling placed between rotor and the cryocooler.
[0025] In an aspect of the invention, the stator core has multiple composite stator teeth placed just inside the stator core bore of stacked iron laminations and the rotor has air cored HTS coils, require lesser length of HTS tape or HTS wire and lesser ampere-turns in the HTS coil based rotor.
[0026] In an aspect of the invention, the stator lamination sector has multiple through holes.
[0027] In an aspect of the invention, an outer surface of the stator lamination sector sector of stator core has a keyway.
[0028] In an aspect of the invention, multi-phase stator winding has a double layer winding.
[0029] In an aspect of the invention, the stator frame is supported at a bottom using frame mounting legs.
[0030] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.
[0031] Various objects, features, aspects, and advantages of the inventive subject matter will become more apparent from the following detailed description of preferred embodiments, along with the accompanying drawing figures in which like numerals represent like components.
[0032] It is to be understood that the aspects and embodiments of the disclosure described above may be used in any combination with each other. Several of the aspects and embodiments may be combined to form a further embodiment of the disclosure.
[0033] The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
[0034] The illustrated embodiments of the subject matter will be best understood by reference to the drawings, wherein like parts are designated by like numerals throughout. The following description is intended only by way of example, and simply illustrates certain selected embodiments of devices, systems, and processes that are consistent with the subject matter as claimed herein, wherein:-
[0035] It is to be noted, however, that the appended drawings illustrate only typical embodiments of the present subject matter and are therefore not to be considered for limiting of its scope, for the present disclosure may admit to other equally effective embodiments. The detailed description is described with reference to the accompanying figures. In the figures, a reference number identifies the figure in which the reference number first appears. The same numbers are used throughout the figures to reference like features and components. Some embodiments of system or methods or structure in accordance with embodiments of the present subject matter are now described, by way of example, and with reference to the accompanying figures, in which:
[0036] Fig. 1 illustrates a sectional view of a stator core in accordance to the present invention;
[0037] Fig. 2 illustrates cross section of a sector of stator lamination sector in accordance to the present invention;
[0038] Fig. 3 illustrates composite stator teeth in accordance to the present invention;
[0039] Fig. 4 illustrates assembly of stator lamination sector with composite teeth in accordance to the present invention;
[0040] Fig. 5 illustrates details of stator slot fill in accordance to the present invention;
[0041] Fig. 6 illustrates longitudinal section of a stator core assembly in accordance to the present invention;
[0042] Fig. 7 illustrates stator winding coil in accordance to the present invention;
[0043] Fig. 8 illustrates longitudinal section of rotating cryostat for High Temperature Superconducting (HTS) rotor in accordance to the present invention;
[0044] Fig. 9 illustrates a sectional view of High Temperature Superconducting machine in accordance to the present invention;
[0045] Fig. 10 illustrates a longitudinal section of High Temperature Superconducting Synchronous Machine in accordance to the present invention.
[0046] A person skilled in the art will easily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.
[0047] The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the structures and methods illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAIL DESCRIPTION OF INVENTION WITH REFERENCE TO THE ACCOMPANYING DRAWINGS OF THE PREFERRED EMBODIMENTS:
[0048] While the embodiments of the disclosure are subject to various modifications and alternative forms, a specific embodiment thereof has been shown by way of example in the figures and will be described below. It should be understood, however, that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternatives falling within the scope of the disclosure.
[0049] The terms “comprises”, “comprising”, or any other variations thereof used in the disclosure, are intended to cover a non-exclusive inclusion, such that a device, system, assembly that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such system, or assembly, or device. In other words, one or more elements in a system or device proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or device.
[0050] The present invention is related to a stator core assembly for a High Temperature Superconducting (HTS) synchronous machine. The present HTS synchronous machine has a double layer multi-phase winding in slots of a stator core realized by an embedded composite teeth in a bore of hollow cylindrical stack of iron core laminations.
[0051] The stator winding and lamination stack is cooled by a combination of closed cycle liquid coolant based stator heat exchanger and externally mounted stator blower assembly. This ventilation combination helps in better managing the thermal load of the stator winding and the stator core. The rotor of HTS synchronous machine has two or higher even multiple HTS coils placed in a rotating cryostat.
[0052] The rotating cryostat has torque tubes at both the ends to reduce thermally conducting heat-in-leak and is surrounded by ultra-high degree vacuum to eliminate convective heat-in-leak. The HTS coils are cryocooled and maintained at 20-40K operating temperature range using helium gas as cryogen in a closed loop manner. The cryogen is circulated with the help of cryogen coupling from stationary cryocooler to rotating HTS coils and collected and fed back to cryocooler. The composite teeth arrangement in stator allows the HTS coils to generate higher magnetic fields without magnetic saturation of teeth.
[0053] This helps the designer to reduce the overall size and weight of the HTS synchronous machine. Also, the cylindrical geometry and presence of composite teeth helps in considerably reducing the noise and vibration of the HTS synchronous machine.
[0054] Referring to Fig. 1, the sectional view of a stator core (101). The stator core (101) is made of angular sectors assembled together to realize a circular lamination. The circular lamination is stacked one over the other. In the inner surface of the circular lamination, multiple composite stator teeth (109) with suitable spacers are inserted in a composite teeth slots (110) to realize the active length of the stator core (101). The multiple composite stator teeth (109) are put together to create slots (108) in a consecutive manner and the multiple composite stator teeth (109) geometry in the inner surface of a stator core (103). The stator core (101) looks like a hollow cylinder whose outer cylindrical surface (102) is attached to a bore of a stator frame with the help of one or more keys placed in key slots (104).
[0055] In the slots (108), a double-layer multi-phase winding is provided over a slot insulation (112). The double-layer multi-phase winding employs hollow conductors (107) to enable flow of a stator liquid coolant. There is an interlayer ventilation space (106) within the slots (108) between top and bottom coil sides to allow the flow of forced air. The slots (108) are closed using slot wedges (111) for mechanical integrity of the stator winding. The stator core (101) has multiple through holes (105) to assemble the stator core (101) as allowed for flowing liquid coolant.
[0056] Fig. 2 illustrates the cross section of a stator lamination sector (201) of the circular lamination of the stator core (101). Two or more such stator lamination sectors are assembled together to form the circular lamination. Each stator lamination sector (201) has multiple through holes (105) to assemble the stator core (101) for ventilation. There are series of the composite teeth slots (110) for teeth insertion. Between two such composite teeth slots (110), the inner surface of the stator lamination sector (201) acts as slots (108) with a slot bottom (204) where the stator windings rest. The outer cylindrical surface (206) of the stator lamination sector (201) has the key slots (104) for assembly of the circular laminations.
[0057] Fig. 3 illustrates the multiple composite stator teeth (109). In the inner surface of stacked circular laminations, multiple composite stator teeth (109) are inserted in the slots (110) to match the teeth insert (302) and to realize the stator core (103). The multiple composite stator teeth (109) after insertion in stacked circular laminations acts as a slot inner surface (304) and a teeth bottom (303) for holding the slot wedge (111).
[0058] Fig. 4 illustrates the assembly (401) of the stator lamination sector (201) with the multiple composite stator teeth (109). Each sector of the stator lamination sector (201) has multiple through holes (105) to assemble the stator core (101) as for ventilation as well. In the inner surface of stator lamination sector (201), multiple composite stator teeth (109) are inserted in the composite teeth slot (110) to realize the consecutive stator teeth and slot arranegement. The stator windings rest in the slot (108) at slot bottom (204). The stator core bore (103) created by the multiple composite stator teeth (109) is referred to as stator core bore inner surface (103). The outer surface of the sector of the stator lamination sector (201) has the keyway (104) for assembly purpose.
[0059] Fig. 5 illustrates the details of stator slot fill made of hollow conductors (107). The slots (108) are used to hold a multi-phase stator winding (500). The multi-phase stator winding (500) is a double layer winding, hence, there are two coils in each layer teamed as top layer coil (placed in top of the slot) and bottom layer coil (placed in bottom of the slot). Each coil is made of various hollow conductors provided with space for a coolant flow (509). In each slot (108), a first inner slot insulation (502) is placed, then a bottom coil side (507) is placed. A space (106) is left blank for ventilation and on each side insulation is provided each for a top coil side (504) and a bottom coil side (506). Thereafter, the top coil side (508) is placed. In the end, each slot (108) is closed using the slot wedge (111) for mechanical integrity of a multi-phase stator winding (500).
[0060] Fig. 6 illustrates a longitudinal section of stator core assembly (600). The stator core assembly (600) has stack (602) of the stator lamination sector (201) and multiple composite stator teeth (109) separated by spacers (607) and altogether pressed on each side by the core end plates (603). The stator core (103) has one or more core ventilation pipes (605) for flow of liquid coolant and radial cooling ducts (606) for allowing the flow of forced air. The outer surface (608) of the stator core (103) has one or more key slot(s) to assemble the stator core (103) inside the stator frame. Inside the bore of the stator core (103), the HTS rotor is placed.
[0061] Fig. 7 illustrates a coil (701) of a stator winding (700). Each coil (701) has two terminals (704). It has two coil sides (703) equal to an active length of the coil (701) and connected with a coil overhang (702). Further, the coils (701) are made of hollow conductors.
[0062] Fig. 8 illustrates a longitudinal section of rotating cryostat for High Temperature Superconducting (HTS) rotor. The rotating cryostat encapsulates all the High Temperature Superconducting (HTS) coils (701) with the help of a coil mounting arrangement (802). The rotating cryostat is provided with two torque tubes one at a drive end (DE) (803) and other at a non-drive end (NDE) (804) to reduce the conduction heat load of the rotating cryostat and to transfer the generated electromagnetic forces to the load. Both DE and NDE torque tubes are connected to DE and NDE shafts (809, 810) respectively with the help of DE and NDE connecting flanges (813, 814). Over DE and NDE shafts, a cylindrical vacuum shell (805) is fastened to create and maintain ultra-high vacuum in a hollow space (806) in the cryostat to reduce convective heat-in-leak. On each DE and NDE shafts, steps (808, 811) are provided to place the DE and NDE bearings. The DE shaft is provided with a flange (807) for connecting it to the mechanical load. At NDE shaft, an excitation system (812) is provided for giving current to HTS coils. The extreme end of NDE shaft is provided with a cryogen coupling (815) which facilitates the flow of cryogen from the cryocooler (816) to HTS coil and back to the cryocooler (816).
[0063] Fig. 9 illustrates the sectional view of High Temperature Superconducting (HTS) synchronous machine. The HTS synchronous machine is realized by integrating the stator assembly (901) and a HTS rotor assembly (902) having HTS coils (904) in a rotating cryostat. The stator and rotor are separated by a physical airgap (903). The stator core (101) is assembled using a stack (905) of the stator lamination sector (201) having multiple composite stator teeth (109). The stator core (101) has multiple through holes (105) to assemble the core as well as for ventilation.
[0064] The outer surface of the stator core (101) has the key (917) placed in key slot (104) for assembly of the stator core into a stator frame (912) along with a ventilation space (911).The stator core (101) has the slots (108) and the multiple composite stator teeth (109) wherein the stator winding (700) made of hollow conductors (107) is placed inside the slots (108). Within the slot (108), an interlayer space (106) is provided for forced air ventilation within the slot (108). The heat generated in the stator core and winding is managed by forced air ventilation through a blower (916). The blower (916) is mounted at the top through a flange (915) via a ventilation duct (914). The overall stator frame is supported at bottom using frame mounting legs (913).
[0065] The stator assembly (600) also has a liquid coolant (demineralized water or mixture of ethylene glycol & demineralized water) for ventilation to manage the thermal load of the stator winding (700) and the stator core along with a forced air ventilation generated by an external blower.
[0066] Fig. 10 illustrates the longitudinal section of High Temperature Superconducting (HTS) synchronous machine. The HTS synchronous machine is realized by integrating stator assembly (901) and an HTS rotor assembly having HTS coils in a rotating cryostat (1002). The stator core assembly comprises of stator laminations, composite teeth, stator winding and liquid coolant and forced air based ventilation system. The stator core (601) is assembled using stack of stator lamination sector (201) having embedded composite teeth (109).
[0067] The stack of laminations and composite teeth separated by stator radial ventilation ducts (606) are altogether pressed on each side by the core end plates (603). The stator core (103) is placed inside the stator frame (912) using a stator core support (1010). The stator core stack contains the stator winding (700) made of hollow conductors. The stator core (103) also has one or more radial vent(s) for allowing the flow of forced air provided by a blower (916) placed on a ventilation duct (914) over the stator frame (912).
[0068] On DE side of machine, there is a cold liquid coolant inlet chamber (1015), which takes coolant from a stator heat exchanger (1019) through a fixed pipe (1017), for providing cold coolant to cool the stator core (103) and the stator winding (700). On NDE side of machine, there is a hot liquid coolant outlet chamber (1016) for collecting back the warm coolant from stator core (103) and stator winding (700).
[0069] There are two sets of cold extension pipes (1013, 1011) and hot extension pipes (1014, 1012) to connect the stator core (1003) and the stator winding (700) to cold and hot coolant chambers (1015, 1016) respectively. The warm coolant which is sent back to stator heat exchanger (1019) through an outlet pipe (1018) is cooled again using the stator coolant heat exchanger (1019) that finally dumps the collected heat to outside atmosphere. The arrows in the figure denoted the flow of the liquid coolant inside the stator of the HTS machine.
[0070] On the rotor side, the rotating cryostat (1002) encapsulates all the HTS coils. The rotating cryostat (1002) is provided with two torque tubes connected to drive end (DE) and non drive end (NDE) shafts (809, 810) respectively. On each DE and NDE shafts (809, 810) steps (808, 811) are provided to place the DE and NDE bearings. The DE shaft (809) is provided with a flange (807) for connecting it to the mechanical load. At the NDE shaft (810), an excitation system (1027) is provided for giving current to HTS coils. The extreme end of the NDE shaft (810) is provided with cryogen coupling (815) which facilitates the flow of cryogen from cryocooler (816) to the HTS coil and back to the cryocooler (816).
[0071] After rotor assembly, the rotor is then placed inside the stator. The stator frame (912) has two end covers (1005) viz. DE side end cover and NDE side end cover to close the complete stator-rotor assembly. The overall stator frame stator frame (912) is supported using frame mounting legs (913) at a bottom at the stator frame base (1031).
[0072] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation, no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to disclosures containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. Also, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general, such construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances, where a convention analogous to “at least one of A, B, or C, etc.” is used, in general, such construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”
[0073] It will be further appreciated that functions or structures of a plurality of components or steps may be combined into a single component or step, or the functions or structures of one-step or component may be split among plural steps or components. The present disclosure contemplates all of these combinations. Unless stated otherwise, dimensions and geometries of the various structures depicted herein are not intended to be restrictive of the disclosure, and other dimensions or geometries are possible. Also, while a feature of the present disclosure may have been described in the context of only one of the illustrated embodiments, such feature may be combined with one or more other features of other embodiments, for any given application. It will also be appreciated from the above that the fabrication of the unique structures herein and the operation thereof also constitute methods in accordance with the present disclosure. The present disclosure also encompasses intermediate and end products resulting from the practice of the methods herein. The use of “comprising” or “including” also contemplates embodiments that “consist essentially of” or “consist of” the recited feature.
[0074] Each of the appended claims defines a separate invention, which for infringement purposes is recognized as including equivalents to the various elements or limitations specified in the claims. Depending on the context, all references below to the "invention" may in some cases refer to certain specific embodiments only. In other cases, it will be recognized that references to the "invention" will refer to subject matter recited in one or more, but not necessarily all, of the claims.
[0075] Groupings of alternative elements or embodiments of the invention disclosed herein are not to be construed as limitations. Each group member can be referred to and claimed individually or in any combination with other members of the group or other elements found herein. One or more members of a group can be included in, or deleted from, a group for reasons of convenience and/or patentability. When any such inclusion or deletion occurs, the specification is herein deemed to contain the group as modified thus fulfilling the written description of all groups used in the appended claims.
[0076] It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particulars claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogues to “at least one of A, B and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B”.
[0077] The above description does not provide specific details of manufacture or design of the various components. Those of skill in the art are familiar with such details, and unless departures from those techniques are set out, techniques, known, related art or later developed designs and materials should be employed. Those in the art are capable of choosing suitable manufacturing and design details.
[0078] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. It will be appreciated that several of the above-disclosed and other features and functions, or alternatives thereof, may be combined into other systems or applications. Various presently unforeseen or unanticipated alternatives, modifications, variations, or improvements therein may subsequently be made by those skilled in the art without departing from the scope of the present disclosure as encompassed by the following claims.
[0079] The claims, as originally presented and as they may be amended, encompass variations, alternatives, modifications, improvements, equivalents, and substantial equivalents of the embodiments and teachings disclosed herein, including those that are presently unforeseen or unappreciated, and that, for example, may arise from applicants/patentees and others.
[0080] While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.
, Claims:WE CLAIM
1. A stator assembly (901) for a high temperature superconducting (HTS) synchronous machine, the stator assembly (901) comprising of:
a stator core (101) having multiple stator lamination sectors (201) assembled together to form a circular lamination, wherein the stator core (101) has a plurality of composite teeth slot (110) to house multiple composite stator teeth (109);
a slot (108) provided in between the multiple composite stator teeth (109) to house a multi-phase winding;
a stator frame (912) along with a ventilation space (911) connected to an outer surface of the stator core (101) using a key slot (104); and
a blower (916) mounted at the top of the stator frame (912) through a flange (915) via a ventilation duct (914).

2. The stator assembly (901) as claimed in claim 1, wherein the stator assembly has a double-layer multi-phase copper winding placed in the slots (108) created by the multiple composite stator teeth (109) inserted in a stator core bore (103) of a hollow cylindrical stack of circular laminations.

3. The stator assembly (901) as claimed in claims 1-2, wherein the stator core bore (103) has multitude of ventilation pipes (605) and radial cooling ducts (606).

4. The stator assembly (901) as claimed in claims 1-3, wherein multiple High Temperature Superconducting (HTS) coils are placed in a rotating cryostat (1002) provided with a drive end and an non drive end shafts (809, 810).

5. The stator assembly (901) as claimed in claims 1-4, wherein the multiple HTS coils (801) placed in the rotating cryostat (1002) are cooled by cold helium gas fed by a cryocooler (816) in a closed loop manner which is facilitated by a cryogen coupling (815) placed between the rotor and the cryocooler (816).

6. The stator assembly (901) as claimed in claims 1-5, wherein the stator core (101) has multiple composite stator teeth (109) placed inside the stator core bore (103) of stacked laminations and the rotor has air cored HTS coils, requires lesser length of HTS tape or HTS wire and lesser ampere-turns in the HTS coil based rotor.

7. The stator assembly (901) as claimed in claims 1-6, wherein the stator lamination sector (201) has multiple through holes (105).

8. The stator assembly (901) as claimed in claim 1-7, wherein an outer surface (405) of the stator lamination sector (201) of stator core has a keyway (104).

9. The stator assembly (901) as claimed in claims 1-8, wherein multi-phase stator winding (500) has a double layer winding.

10. The stator assembly (901) as claimed in claims 1-9, wherein the stator frame (912) is supported at bottom using frame mounting legs (913).