Claims:We Claim:
1. A composite material based shafts arrangement for high temperature superconducting synchronous, comprising:
a NDE metal shaft (601) fixed to a composite material flange (617);
a DE metal shaft (602) fixed to a composite material flange (618); and
two spigots (619, 620) that are given on flat end of the NDE shaft (601) and DE shaft (602) for alignment and arrangement of rotating cryostat (615), respectively;
wherein the HTS synchronous machine rests on bearing at NDE and DE side at NDE and DE bearing interfaces (605, 606) such that critical instrumentation is provided in the HTS synchronous machine to monitor healthiness of overall arrangement is routed through a hollow space (610) provided in the DE shaft (602) and terminated at ports (604) provided for instrumentation bushes.

2. The drive end (DE) and non-drive end (NDE) shafts arrangement (600) as claimed in claim 1, wherein the rotating cryostat (615) is fastened to the NDE and DE shafts (601, 602) through thermally insulated bolts (613, 614).

3. The drive end (DE) and non-drive end (NDE) shafts arrangement (600) as claimed in claim 1, wherein vacuum-tight cryogenic resin (611, 612) is applied on the bolts (613, 614) to maintain vacuum inside the complete arrangement, after fastening the bolts (613, 614) at both NDE and DE side.

4. The drive end (DE) and non-drive end (NDE) shafts arrangement (600) as claimed in claim 1, wherein the composite material flanges (617, 618) are developed on metal base by wrapping of pre-tensioned fibre at a range of 10 to 70 degrees.

5. The drive end (DE) and non-drive end (NDE) shafts arrangement (600) as claimed in claim 1, wherein the fibre reinforced plastic (FRP) material is a material with high torsional strength containing Kevlar fibre along with proportions of G-10 glass in a suitable resin.

6. The drive end (DE) and non-drive end (NDE) shafts arrangement (600) as claimed in claim 1, wherein the NDE and DE shafts (601, 602) are assembled with minimum allowable ovality and eccentricity.

7. The drive end (DE) and non-drive end (NDE) shafts arrangement (600) as claimed in claim 1, wherein a rear end of NDE shaft (601) is coupled to a rotating cryogen transfer device (607) which facilitates the transfer of cryogen from stationary cryo-refrigerator to the rotating cryostat (615) and back.

8. The drive end (DE) and non-drive end (NDE) shafts arrangement (600) as claimed in claim 1, wherein vacuum is created inside the hollow space of HTS machine through a vacuum port (603) provided onto the NDE shaft (601).

9. The drive end (DE) and non-drive end (NDE) shafts arrangement (600) as claimed in claim 1, wherein the hollow space in the NDE shaft (601) is configured to enable the routing of electrical cables and utilized for cryogen transfer lines (609).

10. The drive end (DE) and non-drive end (NDE) shafts arrangement (600) as claimed in claim 1, wherein the HTS machine is a multi-pole electric machine, has even numbered plural superconducting pole coils.

11. The drive end (DE) and non-drive end (NDE) shafts arrangement (600) as claimed in claim 1, wherein the NDE and DE shafts (601, 602) are made of thermally non-conductive material.
, Description:A COMPOSITE MATERIAL BASED SHAFTS ARRANGEMENT FOR HIGH TEMPERATURE SUPERCONDUCTING SYNCHRONOUS MACHINE
FIELD OF INVENTION
[001] The present invention relates to drive end (DE) and non-drive end (NDE) shafts arrangement for high temperature superconducting (HTS) synchronous machine. In particular, to the invention relates to composite material based shafts arrangement for HTS synchronous machine i.e. multi-pole electric machine.
BACKGROUND OF THE INVENTION
[002] Generally, the widely used topology for high temperature superconducting (HTS) synchronous machines is copper winding based stator and superconducting rotor. The copper winding based stator has air-gap winding to accommodate higher magnetic flux densities, while the superconducting rotor has multiple even numbered poles realized by high temperature superconducting coils, usually designated as superconducting pole coils. These superconducting pole coils are encapsulated in a rotating cryostat to produce rotating magneto-motive force (MMF) wave in the air-gap. The superconducting pole coils are cooled down to cryogenic temperature with the help of a cryo-cooler in a closed loop circuit.
[003] In the HTS synchronous machine, the transfer of torque to load/from prime mover via HTS machine rotor is facilitated by drive end (DE) shaft which is maintained at room temperature. The rotor is supported by DE and NDE shafts on two bearings. There is very high amount of conductive heat in-leak to cryogenic system through these shaft ends. DE shaft is directly coupled to load or prime mover, while NDE shaft is coupled to rotating cryogen transfer device which facilitates the transfer of cryogen from stationary cryo-refrigerator to rotating cryostat and back. Usually these shafts are connected to torque tubes transferring torque from cryo temperature regime to room temperature regime. This is totally eliminated with the use of composite material based shaft design. These shafts should be manufactured from a thermally non-conductive material which includes fibre and resin. The fibre orientation in composite is very critical to achieve optimal torsional strength for wide temperature zones established across it. Also, the composite must have inherently low degassing characteristic under high vacuum.
[004] The existing prior art documents are relating to different way of shaft arrangements for high temperature superconducting synchronous machine. The US patent no. 6,129,477 A assigned to “Baldor Electric Co.”. The prior art document relates to a composite torque tube for superconducting motor. The torque tube discloses a rotor support for use in superconducting motors including first and second torque tubes secured between first and second rotor shaft ends and a rotor winding supporter wherein each tube consists of a thermally insulating composite conduit having first and second ends and first and second couplers adhesively bonded to the first and second ends along tapered securing surfaces resulting in essentially singularity-free joints between the conduit and couplers despite disparate shear modulus.
[005] Another prior art US patent no. 5,880,547 A assigned to “Reliance Electric Technologies LLC”. The prior art document relates to an internal torque tube for superconducting motor. The internal torque tube discloses rotor supporter for use in superconducting motors including first and second torque tubes secured between first and second rotor shaft ends and a rotor winding support wherein the support is essentially hollow and the tubes are essentially or entirely located inside the support thereby reducing overall rotor length.
[006] Yet another prior art CA2661563A1, assigned to “American Superconductor Corp.”. The prior art document relates to a torque transmission assembly for superconducting rotating machines. The assembly discloses a rotor assembly includes a superconducting winding assembly positioned within a cryogenic region of the rotor assembly. The rotor assembly includes a torque transfer assembly that includes first and second tubes that are positioned in a radial space external to the superconducting winding assembly and that extend along a longitudinal axis of the rotor assembly.
[007] Yet another prior art US20070137971A1, assigned to “United Technologies Corp”. The prior art document relates to a thermal isolating torque tube that includes a torque tube assembly for transmitting rotational force from a first end to a second end includes a number n of concentric elongate torque tubes, where n is an odd integer greater than or equal to three. The concentric elongate torque tubes are connected for co-rotation. A serpentine thermal conduction path is defined between the first end of the torque tube assembly and the second end of the torque tube assembly, and includes at least a portion of each of the concentric elongate torque tubes.
[008] Still another prior art US20060082249A1, assigned to “Siemens AG”. The prior art relates to a machine with a coolable winding arranged in a winding support and with a torque transmitting device. The machine includes a rotor with a winding for cooling, which is in particular superconducting, in a winding support. A device with a composite body made of fibre-reinforced plastic is provided, for retention of the winding support within a rotor outer housing, on a torque transmitting side. The composite body is in one piece and comprises lateral pieces and a centre piece, whereby the lateral pieces extend outwards in a funnel shape and the centre piece is in the form of a hollow cylinder. The lateral pieces should at least partly comprise a corrugated form in the circumferential direction and are connected with a positive or friction fit by press-ring bodies with flange-like fixing pieces made from metal.
[009] Still another prior art US20080100158A1, assigned to “Doosan Heavy Industries and Construction Co. Ltd”. The prior art document relates to a superconductivity rotor having torque tube that includes superconductivity rotor has a field coil portion wound with a superconductivity wire, a support portion for supporting the field coil portion, torque tubes positioned at both ends of the support portion and transmitting a torque to an outside from the field coil portion, an inner casing for housing the field coil portion and the support portion; and an outer casing for housing the inner casing and the torque tube. The torque tube consists of a first torque tube positioned at one end of the support portion and a second torque tube positioned at the other end of the support portion. The first torque tube is formed into a vessel shape and has a plurality of engagement holes formed along a periphery thereof so that it is engaged with an engagement member, and the second torque tube comprises a disc-shaped structure consisting of plural plates and main ring-shaped members stacked, and is engaged with an engagement member.
[0010] Further prior art WO2008110186A1, assigned to “Jens Müller” and “Jürgen KELLERS”. The prior art document relates to a torque transmission means for the rotationally fixed connection of a shaft and a rotor which discloses superconductive windings and which can be cooled to induce the superconductive state of said windings, with a torque-loadable hollow body having a rotational axis D, which ends on the shaft side in a shaft connection and on the rotor side in a rotor connection. In order to create a torque transmission means which is simple to construct and easily installed, and which in operation facilitates a reliable transmission of the torque even at large temperature differences, the hollow body has a compensation region which is located between the shaft connection and the rotor connection and which is extendable in the axial direction, for the compensation of axial length changes induced by temperature differences.
[0011] The information disclosed in this background of the disclosure section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
OBJECTS OF THE INVENTION
[0012] The principal object of the present invention is to provide composite material based shafts for high temperature superconducting (HTS) synchronous machine.
[0013] Another objective of the present invention is to provide drive end (DE) and non-drive end (NDE) shafts for the HTS machine rotor with a thermally non-conductive material to reduce the conductive heat in-leak in the HTS machine.
[0014] Yet another objective of the present invention is to provide the DE and NDE shafts for the HTS machine rotor catering the need of torque transfer by eliminating torque tubes typically used in the rotating cryostat of HTS machine.
[0015] Yet another object of the present invention is to provide the DE and NDE shafts with optimum thermal mass along with good mechanical strength even at cryogenic temperatures.
[0016] Yet another object of the present invention is to provide the DE and NDE shafts with optimum torsional strength which can safely transfer torque even at cryogenic temperatures.
[0017] Yet another object of the present invention is to provide and assemble the DE and NDE shafts with minimum allowable ovality and eccentricity.
[0018] Further object of the invention is to provide the DE and NDE shafts to reduce the overall rotor length and weight of HTS machine.
[0019] Still another object of the invention is to provide the DE and NDE shafts with material having inherently low degassing characteristic under high vacuum of the order of 10-6 mbar.
[0020] 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
[0021] One or more drawbacks are overcome through the arrangement as claimed in the present invention along with the additional advantages. 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.
[0022] The present subject matter relates to a drive end (DE) and non-drive end (NDE) shafts arrangement for high temperature high temperature superconducting (HTS) synchronous machine. The arrangement comprises DE and NDE shafts having counter bore holes for fastening rotating cryostat. The DE and NDE shafts demonstrate lesser conductive heat in leak along with better torque transmission strength, where the DE and NDE shafts are made of high torsional strength fibre reinforced plastic (FRP) material containing Kevlar fibre along with proportions of G-10 glass in a suitable resin along with high mechanical strength metal base. Accordingly, the HTS machine rests on bearing at DE and NDE side at DE and NDE bearing interfaces such that critical instrumentation is provided in the HTS machine to monitor healthiness of overall arrangement is routed through a hollow space provided in the DE shaft and terminated at ports provided for instrumentation bushes.
[0023] In accordance with an embodiment of the present subject matter relates to the DE and NDE shafts add low heat loads on a cryogenic system and eliminate the use of typical torque tubes in the rotating cryostat of the HTS machine, therefore reducing the overall size and weight of the machine, and improving the overall heat load economy of machine.
[0024] 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.
[0025] 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 DRAWINGS
[0026] 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 invention 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:
[0027] FIG. 1 illustrates longitudinal cross-sectional view of non-drive end (NDE) shaft with composite material flange, in accordance with a present subject matter;
[0028] FIG. 2 illustrates longitudinal cross-sectional view of drive end (DE) shaft with composite material flange, in accordance with a present subject matter;
[0029] FIG. 3 illustrates longitudinal cross-sectional view of non-drive end (NDE) metal shaft with metal pins, in accordance with a present subject matter, in accordance with a present subject matter;
[0030] FIG. 4 illustrates longitudinal cross-sectional view of drive end (DE) metal shaft with metal pins, in accordance with a present subject matter;
[0031] FIG. 5 illustrates cross-sectional view of composite material flange, in accordance with a present subject matter; and
[0032] FIG. 6 illustrates longitudinal cross-sectional view of high temperature superconducting synchronous machine with composite material based drive end (DE) and non-drive end (NDE) shaft arrangement, in accordance with a present subject matter.
[0033] The figures depict embodiments of the present subject matter for the purposes of illustration only. 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.

DESCRIPTION OF THE PREFERRED EMBODIMENTS:
[0034] While the embodiments of the disclosure are subject to various modifications and alternative forms, specific embodiment thereof have 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 alternative falling within the scope of the disclosure.
[0035] 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.
[0036] It should be noted that the description and figures merely illustrate the principles of the present subject matter. It should be appreciated by those skilled in the art that conception and specific embodiment disclosed may be readily utilized as a basis for modifying or designing other structures for carrying out the same purposes of the present subject matter. It should also be appreciated by those skilled in the art that by devising various arrangements that, although not explicitly described or shown herein, embody the principles of the present subject matter. Furthermore, all examples recited herein are principally intended expressly to be for pedagogical purposes to aid the reader in understanding the principles of the present subject matter and the concepts contributed by the inventor(s) to furthering the art and are to be construed as being without limitation to such specifically recited examples and conditions. The novel features which are believed to be characteristic of the present subject matter, both as to its organization and method of operation, together with further objects and advantages will be better understood from the following description when considered in connection with the accompanying figures.
[0037] These and other advantages of the present subject matter would be described in greater detail with reference to the following figures. It should be noted that the description merely illustrates the principles of the present subject matter. It will thus be appreciated that those skilled in the art will be able to devise various arrangements that, although not explicitly described herein, embody the principles of the present subject matter and are included within its scope.
[0038] Fig.1 illustrates longitudinal cross-sectional view of non-drive end (NDE) shaft 102 with a composite material flange 101, in accordance with a present subject matter. The NDE shaft 102 is fixed with a composite material flange 101 such that the composite material flange 101 is developed on metal base with metal pins by wrapping of pre-tensioned fiber at a range of 10 to 70 degrees. The NDE metal shaft 102 has a counter bore hole 103 for fastening a rotating cryostat 615. The vacuum is created inside the hollow space of HTS machine through a vacuum port 104 provided onto the NDE shaft 102. The hollow space design enables the routing of electrical cables and are utilized for cryogen transfer lines 108. The HTS machine rests on bearing at NDE side at NDE bearing interface 105. A spigot 106 is provided on the NDE shaft 102 for alignment and arrangement of the rotating cryostat 615. A rear end of NDE shaft 102 is longitudinally coupled to a rotating cryogen transfer device 107 which facilitates the transfer of cryogen from stationary cryo-refrigerator to rotating cryostat and back.
[0039] Fig.2 illustrates longitudinal cross-sectional view of drive end (DE) shaft 203 with composite material flange 201, in accordance with a present subject matter. The DE shaft 203 is fixed with a composite material flange 201 such that the composite material flange 201 is developed on metal base with pins by wrapping of pre-tensioned fibre at a range of 10 to 70 degrees. The DE shaft 203 has a counter bore hole 202 for fastening a rotating cryostat 615. The critical instrumentation provided in the HTS machine to monitor the healthiness of overall arrangement is routed through hollow space 207 provided in the DE shaft 203 and terminated at ports 205 provided for instrumentation bushes. The HTS machine rests on bearing at DE side at DE bearing interface 204. A spigot 206 is provided on the DE shaft 203 for alignment and arrangement of the rotating cryostat 615. A rear end of DE metal shaft 203 is longitudinally coupled to load/prime mover 208.
[0040] Fig.3 illustrates another embodiment of the present invention. Figure 3 discloses the longitudinal cross-sectional view of non-drive end (NDE) shaft 301 with metal pins 302, in accordance with a present subject matter. The composite material flange is developed on a plurality of metal pins 302 at metal base by wrapping of the pre-tensioned fibre at a range of 10 to 70 degrees, where the fibre is reinforced to the NDE shaft 301 after applying a suitable resin. The vacuum is created inside the hollow space of HTS machine through a vacuum port 303 provided onto the NDE shaft 301. This hollow space design enables the routing of electrical cables and utilized for cryogen transfer lines 304. The HTS machine rests on bearing at NDE side at NDE bearing interface 305. A rear end of NDE shaft 301 is longitudinally coupled to rotating cryogen transfer device 306.
[0041] Fig.4 illustrates another embodiment of the present invention. Figure 4 discloses the longitudinal cross-sectional view of drive end (DE) shaft 401 with metal pins 402, in accordance with a present subject matter. The composite material flange is developed on a plurality of metal pins 402 at metal base by wrapping of pre-tensioned fibre at a range of 10 to 70 degrees, where the fibre is finally reinforced to the DE shaft 401 after applying a suitable resin. Instrumentation cables are routed through the hollow space 404 provided in the DE shaft 401 and terminated at instrumentation ports 403. The HTS machine rests on bearing at DE side at DE bearing interface 405. A rear end of DE shaft 401 is longitudinally coupled to the load/prime mover 406.
[0042] Fig.5 illustrates cross-sectional view of composite material flange, in accordance with a present subject matter. The composite material flange 501, according to the present invention is manufactured developed by wrapping of pre-tensioned fibre in a desired angle on the metal pins provided on the metal base. The fibre reinforced plastic (FRP) material used in this application is a material having high torsional strength containing Kevlar fibre along with proportions of G-10 or S- glass in a suitable resin. The composite material flange also has counter bore hole 502 for fastening rotating cryostat. A spigot 503 is provided on the NDE shaft for alignment and arrangement of the rotating cryostat 615.
[0043] Fig.6 illustrates longitudinal cross-sectional view of high temperature superconducting (HTS) synchronous machine with composite material based DE and NDE shafts arrangement, in accordance with a present subject matter. The HTS synchronous machine has superconducting pole coils 616 encapsulated in a rotating cryostat 615. The superconducting pole coils 616 are maintained at cryogenic temperature up to 20K in a closed loop cooling circuit with the help of cryo-refrigerator. The rotating cryostat 615 is fastened to the NDE and DE metal shafts 601, 602 through thermally insulated bolts 613, 614. The NDE and DE shafts 601, 602 are fixed to the composite material flanges 617, 618, respectively. The composite material flanges 617, 618 are developed on metal base by wrapping of pre-tensioned fibre at a range of 10 to 70 degrees. The NDE and DE shafts 601, 602 have counter bore holes for fastening rotating cryostat. After fastening the bolts 613, 614 at both NDE and DE side, a vacuum-tight cryogenic resin 611, 612 is applied on the bolts 613, 614 to maintain vacuum inside the arrangement. The vacuum is created inside the hollow space of HTS machine through a vacuum port 603 provided onto the NDE shaft 601. This hollow space 609 design in the NDE shaft 601 also enables the routing of electrical cables and utilized for cryogen transfer lines. The HTS machine rests on bearing at NDE and DE side at NDE and DE bearing interfaces 605, 606. The critical instrumentation provided in the HTS machine to monitor the healthiness of overall arrangement 600 is routed through hollow space 610 provided in the DE shaft 602 and terminated at ports 604 provided for instrumentation bushes. The rear end of NDE shaft 601 is coupled to a rotating cryogen transfer device 607 which facilitates the transfer of cryogen from stationary cryo-refrigerator to the rotating cryostat 615 and back, while the rear end of DE shaft 602 is longitudinally coupled to the load/prime mover 608.
[0044] 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 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 analogous 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.”
[0045] 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 invention 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 invention, and other dimensions or geometries are possible. In addition, while a feature of the present invention 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 invention. The present invention 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.
[0046] Although embodiments for the present subject matter have been described in language specific to structural features, it is to be understood that the present subject matter is not necessarily limited to the specific features described. Rather, the specific features and methods are disclosed as embodiments for the present subject matter. Numerous modifications and adaptations of the system/component of the present invention will be apparent to those skilled in the art, and thus it is intended by the appended claims to cover all such modifications and adaptations which fall within the scope of the present subject matter.