Coaxial motor power cable

Abstract

A coaxial three-phase servo motor power cable is comprised of a shielded twisted triple cable which transmits three phase electrical power from a servo amplifier to a servo motor, with the shield being electrically insulated and mechanically floating within an air void that exists inside a conduit having a diameter much greater than the shielded twisted triple cable. The conduit is covered by a braid shield, which is covered by shrink tubing which may be overlaid by one or more additional signal wires, with this entire assembly being further covered by an over braid shield, which is covered by an outer insulating sheath. Both the conduit braid shield and over braid shield are electrically terminated to back shells at each end of a cable assembly.

Claims

1. A coaxial cable for electrical power transmission, comprising: a shielded twisted power cable, the shielded twisted power cable being comprised of a plurality of power conductors that are twisted together and being covered by a braid shield, the braid shield being electrically insulated from any other electrical component; an electrically insulating shrink tubing covering the shielded twisted power cable; an electrically nonconductive conduit surrounding the electrically insulating shrink tubing, wherein the inside diameter of the electrically nonconductive conduit is greater than the outside diameter of the electrically insulating shrink tubing, said electrically nonconductive conduit terminates without contacting a back shell; the electrically nonconductive conduit having an inside diameter two or three times the outer diameter of the shielded twisted power cable defining a void space surrounding the electrically insulating shrink tubing inside of the electrically nonconductive conduit; a conduit braid shield covering the electrically nonconductive conduit, wherein the conduit braid shield is terminated at each end without contacting the back shell, a shrink tubing layer covers the conduit braid shield, said shrink tubing layer terminating prior to the back shell and sealed, the void space filled with air to form a dielectric layer; and wherein the conduit braid shield mechanically floats inside the void space defined by the electrically nonconductive conduit.

2. The coaxial cable of claim 1, wherein the shielded twisted power cable is comprised of three power conductors.

3. The coaxial cable of claim 1, wherein the shielded twisted power cable is comprised of two power conductors.

4. The coaxial cable of claim 1, wherein the shielded twisted power cable is comprised of four or more power conductors.

5. The coaxial cable of claim 1, wherein the inside diameter of the electrically nonconductive conduit is at least 1.5 times the outside diameter of the electrically insulating shrink tubing covering the shielded twisted triple cable.

6. The coaxial cable of claim 1, wherein the electrically nonconductive conduit is mechanically flexible.

7. The coaxial cable of claim 1, wherein the electrically nonconductive conduit is manufactured from polytetrafluoroethylene.

8. The coaxial cable of claim 1, wherein at least one additional electrical wire runs the length of the coaxial power cable, and wherein the at least one additional electrical wire is on the outside of the conduit braid shield covering the electrically nonconductive conduit.

9. The coaxial cable of claim 8, wherein an over braid shield covers the at least one additional electrical wire, and wherein the over braid shield is electrically terminated at each end.

10. The coaxial cable of claim 9, wherein an outer sheath covers the over braid shield.

11. The coaxial cable of claim 1, wherein the void space is filled with air.

12. The coaxial cable of claim 1, wherein the void space is filled with a gas other than air.

13. The coaxial cable of claim 1, having two ends, wherein electrical mechanical connectors are affixed to the coaxial cable at its two ends, the electrical mechanical connectors being electrically connected to the power conductors at their two ends, and wherein a back shell on each electrical mechanical connector electrically terminates the braid shield at its two ends.

14. A coaxial cable for electrical power transmission, comprising: a shielded twisted power cable, the shielded twisted power cable being comprised of a plurality of power conductors that are twisted together and being covered by a braid shield covering the power conductors, the braid shield being electrically insulated from any other electrical component; an electrically insulating shrink tubing covering the shielded twisted power cable; an electrically nonconductive conduit surrounding the electrically insulating shrink tubing, wherein the inside diameter of the electrically nonconductive conduit is greater than the outside diameter of the electrically insulating shrink tubing; the electrically nonconductive conduit defining a void space surrounding the electrically insulating shrink tubing inside of the electrically nonconductive conduit; wherein the electrically nonconductive conduit terminates at each end without contacting a backshell; wherein the braid shield mechanically floats inside the void space defined by the electrically nonconductive conduit; and wherein at least one additional electrical wire runs the length of the coaxial power cable, and wherein the at least one additional electrical wire is on the outside of a conduit braid shield covering the electrically nonconductive conduit.

15. A method of making a coaxial cable for electrical power transmission, comprising: inserting a shielded twisted power cable into an electrically nonconductive conduit, wherein the inside diameter of the electrically nonconductive conduit is two to three times greater than the outside diameter of the shielded twisted power cable, said shielded twisted power cable comprising a plurality of power conductors that are twisted together and being covered by a braid shield covering the power conductors, the braid shield terminated without contacting back shell, and wherein the electrically nonconductive conduit defines a void space between the shielded twisted power cable and the electrically nonconductive conduit; floating the braid shield mechanically inside the void space defined by the electrically nonconductive conduit; placing a conduit braid shield over the outside of the electrically nonconductive conduit; covering the conduit braid shield with a layer of shrink wrap to seal the void space, said layer of shrink wrap terminating without contacting the back shell; attaching an electrical mechanical connector at each end of the coaxial cable, wherein each electrical mechanical connector has the back shell; wherein the nonconductive conduit terminates without contacting the back shell, attaching each electrical mechanical connector to each end of the shielded twisted power cable; and attaching each back shell to an over braid shield.

16. The method of claim 15, wherein at least one additional electrical wire is placed along the length of the coaxial power cable, and wherein the at least one additional electrical wire is on the outside of the conduit braid shield covering the electrically nonconductive conduit.

17. The method of claim 15, wherein the void space is filled with air.

18. The method of claim 15, wherein the void space is filled with a gas other than air.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) Subject matter hereof may be more completely understood in consideration of the following detailed description of various embodiments in connection with the accompanying figures, in which:

(2) FIG. 1A is an electrical schematic diagram of a typical three-phase servo motor control drive system as seen in the prior art.

(3) FIG. 1B is a typical phase voltage waveform observed during a servo positioning event in the aforementioned three-phase servo control drive system as seen in the prior art.

(4) FIG. 1C is a typical shield current waveform in response to the aforementioned phase voltage waveform observed during a servo positioning event as seen in the prior art.

(5) FIG. 2 is a cross-sectional diagram of a typical coaxial three-phase servo motor power as seen in the prior art.

(6) FIG. 3 is a cross-sectional diagram of the coaxial three-phase servo motor power cable according to the present invention.

(7) FIG. 4 is a top view of a typical embodiment of a completed cable assembly of the coaxial three-phase servo motor power cable according to the present invention.

(8) FIG. 5 is an electrical schematic diagram of a typical embodiment of a completed cable assembly of the coaxial three-phase servo motor power cable according to the present invention.

(9) While various embodiments are amenable to various modifications and alternative forms, specifics thereof have been shown by way of example in the drawings and will be described in detail. It should be understood, however, that the intention is not to limit the claimed inventions to the particular embodiments described. On the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the subject matter as defined by the claims.

DETAILED DESCRIPTION OF THE DRAWINGS

(10) The present invention is a coaxial three-phase servo motor power cable which may be used in a servo electronic equipment system to supply three-phase differential electrical power from a three-phase servo amplifier to a three-phase servo motor. The present invention may be understood by referring to the figures, beginning with a discussion of the prior art and the problems associated thereof.

(11) FIG. 1A is an electrical schematic diagram of a typical three-phase servo motor control drive system as seen in the prior art. Servo amplifier unit 10 receives electrical power from the ship or vehicle on which it is installed at power supply input 11. EMI filter 12 provides electromagnetic interference (EMI) suppression. Line to chassis common mode filter capacitors 13 also provide EMI interference suppression. Three-phase power inverter circuitry 14 performs three-phase differential voltage generation as commanded by control circuitry 18. Ground fault transducer 15 detects ground fault conditions and provides a ground fault signal 16 into control circuitry 18. Shielded enclosure 17 surrounds servo amplifier unit 10 to provide EMI suppression to the servo electronic equipment, including servo amplifier unit 10. A pair of power semiconductor devices 21 provide complimentary electrical switching to produce a voltage for a single electrical phase of the system.

(12) With a power supply voltage of 600 VDC from power supply input 11, the relative voltage provided to this single phase will vary from 300 VDC to +300 VDC. Three-phase power inverter circuitry 14 is comprised of three pairs of power semiconductor devices 21, thereby producing a three-phase differential voltage signal from servo amplifier unit 10, which is transmitted by three-phase servo motor power cable 30 to power servo motor 60. Three-phase servo motor power cable 30 is comprised of three power wires 31, 32, 33 which correspond to servo motor phases A, B, and C, respectively. Within a servo amplifier schematic diagram, these may also correspond to phases u, v, and w, respectively. Power wires 31, 32, 33 are twisted together and covered by braid shield 41 for EMI suppression. Motor signal cable 61 transmits resolver and RTD information from servo motor 60 back to servo amplifier unit 10, thereby providing resolver and RTD signal 62 into control circuitry 18. The arrangement of the three power wires 31, 32, 33 being contained within braid shield 35 produces a parasitic conductor to shield/ground capacitance which may be modeled as ICc-shield capacitor 36. As a result, parasitic ICc-shield current 46 flows through ICc-shield capacitor 36. ICc-shield current 46 flows in three-phase servo motor power cable 30, resulting in both ICc-shield servo amplifier current 47 and ICc-shield servo motor current 48. A portion of parasitic ICc-shield current 46 may flow on the hull of the ship or structure of the vehicle on which the servo electronic equipment is mounted, thereby potentially interfering with other sensitive circuits, while also inducing a voltage potential which may provide a personnel safety hazard. Being parasitic in nature, ICc-shield servo amplifier current 47 and ICc-shield servo motor current 48 produces detrimental effects in servo amplifier unit 10 and the associated servo electronic equipment systems. Other undesirable effects that occur within the servo electronic equipment system include servo motor power cable interference 41, servo motor power cable shield electromagnetic radiation 45, and servo motor to ground interference 49. Collectively, these adverse effects may render the servo electronic equipment incapable of meeting the stringent design criteria which may exist for a particular application.

(13) FIG. 1B is a typical phase voltage waveform observed during a servo positioning event in the aforementioned three-phase servo control drive system as seen in the prior art. With a power supply voltage of 600 volts from power supply input 11, the voltage transient seen on a particular phase of the circuit may increase from 300 VDC to +300 VDC during a relatively short switching time t1 that is typically 200 nanoseconds. In a typical high performance servo electronic equipment system, switching time t1 may typically range from 100 to 500 nanoseconds.

(14) FIG. 1C is a typical shield current waveform in response to the aforementioned phase voltage waveform observed during a servo positioning event as seen in the prior art. With the voltage swing from 300 VDC to +300 VDC during a switching time t1 of 200 nanoseconds, a typical value of ICc-shield current 46 flowing during this transient is 40 Amps. The value of ICc-shield current 46 is proportional to both the value of ICc-shield capacitor 36 and the time rate of voltage change, dV/dt.

(15) In most applications, including high power applications at which the present invention is directed, it is desirable to have a relatively short switching time t1. Increasing the switching time t1 would help in lowering the value of ICc-shield current 46 flowing during the switching transient, but it would increase the power dissipation in servo amplifier unit 10, thereby increasing the size and weight of the heat sink that is required in servo amplifier unit 10. Therefore, this is not an adequate solution. Accordingly, the high value of ICc-shield current 46 results in a high value of ICc-shield servo amplifier current 47 that flows back through ground fault transducer 15, causing it to electrically saturate and thereby rendering it useless for its intended purpose. Additionally, the resulting high value of ICc-shield servo motor current 48 causes a current flow back along the shield of motor signal cable 61, thereby interfering with low level signals being transmitted such as the resolver and RTD signal 62, which is input back to control circuitry 18, thereby degrading servo electronic equipment system performance. A portion of ICc-shield current 46 may flow back on the ship or vehicle structure, interfering with other sensitive electrical circuits while also inducing a potential voltage which may pose a shock hazard to personnel. Moreover, current flowing back on braid shield 35 induces electromagnetic radiation 45, which propagates into the environment surrounding the servo electronic equipment. Finally, the calculated value of ICc-shield capacitor 36 drives the value required for line to chassis common mode filter capacitors 13, with an increasing value increasing the hazards of electrical shock to personnel.

(16) FIG. 2 is a cross-sectional diagram of a typical coaxial three-phase servo motor power cable of the prior art as disclosed in FIG. 1A. Three power wires 31, 32, 33 correspond to servo motor phase terminals A, B, and C, respectively. Power wires 31, 32, 33 are twisted together and covered by two layers of insulating tape 34, which is then covered by shield braid 35. A pair of additional signal wires 37 are used to transmit motor signals and other information. This assembly is surrounded by insulating conduit 38, which is covered by copper over braid 39, which is finally covered by outer sheathing 40. Each end of the cable assembly includes an EMI and environmental back shell 50. One end of the cable assembly is terminated with connector plug 51, and the other end of the cable assembly is terminated with connector jack 52. A typical length of coaxial three-phase servo motor power cable that is installed aboard a military artillery vehicle is 75 feet. This design has tight capacitive coupling between the motor power conductors and shield, as depicted by the close proximity 49 between power wires 31, 32, 33 and shield braid 35. This close proximity 49 increases electrical capacitance of the coaxial three-phase servo motor power cable, and therefore contributes to the detrimental system effects previously described.

(17) FIG. 3 is a cross-sectional diagram of the coaxial three-phase servo motor power cable according to the present invention. A typical embodiment of the coaxial three-phase servo motor power cable 100 includes three power conductors, 111, 112, 113, which correspond to electrical phase terminals A, B, and C, respectively. Three power conductors, 111, 112, 113 deliver three phase differential electrical power from servo amplifier unit 10 to servo motor 60. The three power conductors, 111, 112, 113 are twisted together and are covered by braid shield 115 which is not terminated at their ends, but is instead electrically insulated from any other electrically conductive component. Taken together, this assembly becomes the shielded twisted triple cable 117. Braid shield 115 establishes capacitive coupling between each of the three power conductors 111, 112, 113, thereby balancing the capacitive coupling between each power conductor 111, 112, 113 and braid shield 115. This capacitive coupling has the effect of making the power conductors 111, 112, 113 appear as a single electrical conductor for common mode conductor to shield currents. Shrink tubing 116 is used to terminate each end of braid shield 115, electrically insulating it from other electrical components in coaxial three-phase servo motor power cable 100.

(18) Conduit 120 surrounds shielded twisted triple cable 117. Conduit 120 is electrically insulating and mechanically flexible. In an embodiment, conduit 120 is manufactured from polytetrafluoroethylene (PFA, commercially marketed as TEFLON.) Shielded twisted triple cable 117 is routed inside conduit 120, with the inside diameter of conduit 120 generally being significantly greater than the outside diameter of shielded twisted triple cable 117. Conduit braid shield 121 surrounds conduit 120, with conduit 120 separating the shielded twisted triple cable 117 from conduit braid shield 121. Conduit braid shield 121 is electrically terminated at each end of coaxial three-phase servo motor power cable 100, thereby resulting in an electrical circuit.

(19) In an embodiment, conduit 120 has a relatively thin wall thickness, and the inside diameter of the conduit is between two and three times the outside diameter of the shielded twisted triple cable, thereby creating void space 114 between shielded twisted triple cable 117 and conduit braid shield 121. Void space 114 is filled with air, which becomes the electrical dielectric. In an embodiment, back shells 141, 142 are at each end of coaxial three-phase servo motor power cable 100, and they perform the function of an EMI/environmental connector. Shrink tubing 122 covers conduit braid shield 121. In an embodiment, plug 151 is at one end, and jack 152 is at the other end of coaxial three-phase servo motor power cable 100. Plug 151 and jack 152 will enable the rapid installation of coaxial three-phase servo motor power cable 100 in a servo electronic system during system installation, while also enabling rapid disconnection and reconnection during equipment maintenance or replacement.

(20) In an embodiment, additional conductors 125, 126 are included in coaxial three-phase servo motor power cable 100 to provide signals from servo motor 60 back to the servo amplifier unit 10, with additional conductors 125, 126 being routed on the outside of shrink tubing 122. Over braid shield 130 covers additional conductors 125, 126, and then shrink tubing 131 provides an outer sheath. When multiple braid shields are used in a particular embodiment, such as the use of both conduit braid shield 117 and over braid shield 130 as described in an embodiment above, they are typically electrically insulated from each other along the entire length of coaxial three-phase servo motor power cable 100, and they are electrically terminated to back shells 141, 142 at each end of coaxial three-phase servo motor power cable 100.

(21) The coaxial three-phase servo motor power cable of the present invention contains air void space 114 between the shielded twisted triple cable 117 and conduit braid shield 121, whereby the effective electrical capacitance of this present invention may be modeled using the following equation:
C[Farads/meter]=(2or)/Ln(Bc/Ac), where:

(22) o [Farads/meter]=Permittivity of Free Space=8.854E12;

(23) r=Relative Permittivity=1.0 Air;

(24) Bc [meters]=Distance from the center of conduit 120 to the inner wall of the conduit 120; and

(25) Ac [meters]=Radius of shielded twisted triple cable 117.

(26) This equation is valid despite the fact that twisted triple cable 117 is free to move within the void space 114 that exists inside conduit 120, and the ratio of Bc/Ac may be adjusted to achieve the required capacitance calculation.

(27) The inductance between the shielded twisted triple cable 117 and conduit braid shield 121 of the present invention may be modeled using the following equation:
L[Henries/meter]=(orLn(BI/AI))I(2) where:

(28) o [Henries/meter]=Permeability of free space 41 E7;

(29) r=Relative Permeability=1.0 for the air and TEFLON composite dielectric;

(30) BI [meters]=Distance from the center of conduit 120 to conduit braid shield 121; and

(31) AI [meters]=Radius of shielded twisted triple cable 117.

(32) This equation is valid despite the fact that the shielded twisted triple cable 117 is free to move within void space 114 that exists inside conduit 120.

(33) In an embodiment of the present invention that was evaluated during the reduction to practice of the invention, a ratio of B/A was targeted in the range of 2.0 to 3.2 which results in an electrical impedance similar to that of coaxial cables of the prior art. For example, RG-58 coaxial cable, which has been widely used in RF design applications, has a characteristic impedance of 50. The characteristic impedance of this particular embodiment of the present invention may be modeled by the following set of equations:
c[Farads/meter]=(2or)/Ln(Bc/Ac)=62.6E12F/M, where:

(34) o [Farads/meter]=Permittivity of Free Space=8.854E12;

(35) r=Relative Permittivity=1.0 for the air and polytetrafluoroethylene composite dielectric;

(36) Bc [meters]=Distance from the center of the conduit 120 to the inner wall of the conduit 120=7.658E3; and

(37) Ac [meters]=Radius of the shielded twisted triple cable 117=3.048E3.

(38) Using this same range, a ratio of B/A in the range of 2.0 to 3.2 was targeted, achieving the following:
L[Henries/meter]=(orLn(BI/AI))/(2)=228E9H/m, where:

(39) o [Henries/meter]=Permeability of Free Space=41 E7;

(40) r=Relative Permeability=1.0 for the air and polytetrafluoroethylene composite dielectric;

(41) BI [meters]=Distance from the center of conduit 120 to conduit braid shield 121=9.56E3 m;

(42) AI [meters]=radius of shielded twisted triple cable 117=3.048E3 m;

(43) Cable characteristic impedance=SQRT (L/C)=60.4.

(44) Initial testing on a prototype embodiment of the present invention using a 75 foot cable assembly demonstrated a 15 reduction in capacitance and a 3.75 reduction in peak noise current. Additionally, testing of this prototype embodiment produced no troublesome interference with the operation of ground fault transducer 15.

(45) FIG. 4 is a top view of a typical embodiment of a completed cable assembly of the coaxial three-phase servo motor power cable according to the present invention, and it depicts a typical embodiment that would be provided for a military field vehicle installation. Cable piece 200 is manufactured from coaxial three-phase servo motor power cable 100 as depicted in FIG. 3. In an embodiment, cable piece 200 may be 75 feet in length. It should be obvious to those who are skilled in the art that any practical cable length utilizing the disclosure of the present invention will yield benefits over an equivalent cable length of the prior art, and the present invention covers embodiments of any cable length. However, a length of 75 feet was selected to illustrate this embodiment because that is the typical length of coaxial three-phase servo motor power cable that is installed aboard a military artillery vehicle of the prior art.

(46) In this embodiment, plug 251 terminates one end of cable piece 200. Plug 251 may be a commercially available electrical plug that is compatible for installation with servo amplifier unit 10, or it may be a new design that does not currently exist. Back shell 253 joins cable piece 200 to plug 251, with conduit braid shield 121 and over braid shield 130 of the coaxial three-phase servo motor power cable 100 being electrically terminated at back shell 253. Hot melt heat shrink 255 covers the region where cable piece 200 meets back shell 253, providing mechanical support while sealing against environmental contamination and moisture. Similarly, jack 252 terminates the other end of cable piece 200, and jack 252 may be a commercially available electrical jack that is compatible for installation with servo motor 60, or it may be a new design that does not currently exist. Back shell 254 joins cable piece 200 to jack 252, with the over braid shield 130 of the coaxial three-phase servo motor power cable 100 being electrically terminated at back shell 254. Hot melt heat shrink 256 covers the region where cable piece 200 meets back shell 254, providing mechanical support while sealing against environmental contamination and moisture.

(47) In an embodiment, one or more labels 257 are optional, but if used, they may be on the outside of cable piece 200 near plug 251, near jack 252, and if also desired, at one or more points along the length of cable piece 200 to provide suitable information to a user.

(48) FIG. 5 is an electrical schematic diagram of a typical embodiment of a completed cable assembly of the coaxial three-phase servo motor power cable according to the present invention. Power wires 311, 312, 313 correspond to servo motor phases A, B, and C, respectively. In an embodiment, additional conductors 325, 326 are included in the coaxial three-phase servo motor power cable 300 to provide signals from servo motor 60 back to servo amplifier unit 10. Twist symbol 314 depicts the twisting together of power wires 311, 312, 313, along with braid shield 315 forming shielded twisted triple cable 317. Heat shrink 316 covers shielded twisted triple cable 317. Shielded twisted triple cable 317 is routed through conduit 320, which is flexible, with the large void space between shielded twisted triple cable 317 and conduit 320 being filled by air. The electrical schematic diagram depicted in FIG. 5 illustrates both ends of a completed cable assembly. For visual clarity, many of the components described here are only labeled on one end of the schematic. It would be obvious to one who is skilled in the art that the same labels would be applied to the components on both ends of the diagram.

(49) Shielded twisted triple cable 317 is allowed to mechanically float within the void space 114 inside of conduit 320. The outside of conduit 320 is covered by conduit braid shield 321, which is in turn covered by shrink tubing 322. In an embodiment, additional conductors 325, 326 are included in the coaxial three-phase servo motor power cable 300 to provide signals from servo motor 60 back to servo amplifier unit 10, and they are routed on the outside of shrink tubing 322. Over braid shield 330 covers additional conductors 325, 326, and then shrink tubing 331 provides an outer sheath. In the embodiment depicted, plug 351 is located at one end of the coaxial three-phase servo motor power cable 300 and it contains five connectors. In this embodiment, jack 352 is located at the other end of the coaxial three-phase servo motor power cable 300 and it contains five connectors.

(50) Various embodiments of systems, devices, and methods have been described herein. These embodiments are given only by way of example and are not intended to limit the scope of the claimed inventions. It should be appreciated, moreover, that the various features of the embodiments that have been described may be combined in various ways to produce numerous additional embodiments. Moreover, while various materials, dimensions, shapes, configurations and locations, etc. have been described for use with disclosed embodiments, others besides those disclosed may be utilized without exceeding the scope of the claimed inventions.

(51) Persons of ordinary skill in the relevant arts will recognize that the subject matter hereof may comprise fewer features than illustrated in any individual embodiment described above. The embodiments described herein are not meant to be an exhaustive presentation of the ways in which the various features of the subject matter hereof may be combined. Accordingly, the embodiments are not mutually exclusive combinations of features; rather, the various embodiments can comprise a combination of different individual features selected from different individual embodiments, as understood by persons of ordinary skill in the art. Moreover, elements described with respect to one embodiment can be implemented in other embodiments even when not described in such embodiments unless otherwise noted.

(52) Although a dependent claim may refer in the claims to a specific combination with one or more other claims, other embodiments can also include a combination of the dependent claim with the subject matter of each other dependent claim or a combination of one or more features with other dependent or independent claims. Such combinations are proposed herein unless it is stated that a specific combination is not intended.

(53) Any incorporation by reference of documents above is limited such that no subject matter is incorporated that is contrary to the explicit disclosure herein. Any incorporation by reference of documents above is further limited such that no claims included in the documents are incorporated by reference herein. Any incorporation by reference of documents above is yet further limited such that any definitions provided in the documents are not incorporated by reference herein unless expressly included herein.