GB2540624A - System and methods for transferring electrical signal or power to a rotatable component - Google Patents
System and methods for transferring electrical signal or power to a rotatable component Download PDFInfo
- Publication number
- GB2540624A GB2540624A GB1513106.3A GB201513106A GB2540624A GB 2540624 A GB2540624 A GB 2540624A GB 201513106 A GB201513106 A GB 201513106A GB 2540624 A GB2540624 A GB 2540624A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rotatable component
- coil
- rotation
- receiver coil
- transmitter coil
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/18—Rotary transformers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/14—Inductive couplings
Abstract
A non-contact system and method for transferring an electrical signal or power to a rotating component 2, used for example to power sensors 18 to monitor the condition of wind turbines. A magnetic inductive coupling is generated between a non-rotating transmitter coil 16 and a receiver coil 14, which is fixed to and rotates with the component 2. At least one of the coils 14, 16 encircles a part of the rotating component and its axis of rotation 5. The coils may overlap, and form a coaxial arrangement with the rotating component 2. The mutual inductance between the coils may be independent of the angle of rotation of the component 2. A unit 20 may transfer signals or power from the transmitter coil 16 to the receiver coil 14 using non-resonant or resonant magnetic induction.
Description
SYSTEMS AND METHODS FOR TRANSFERRING ELECTRICAL SIGNAL OR POWER TO A
ROTATABLE COMPONENT
The present invention relates to eontaetless electrical signal or power transfer in rotating machines, for example for the purpose of powering wireless sensors for structural health monitoring or condition monitoring.
Using sensors to monitor components in rotating machines is known in the art. Where the measurements involve high data rates, for example where measurements are carried out in real time and/or concern measurements of dynamic properties of the rotating machines, power consumption by the sensors may be high. Where the sensors need to be mounted on rotating components, the transfer of signal or power between the sensors and surrounding apparatus can be difficult because of the relative movement caused by the rotation, particularly where high reliability and/or longevity is required. High reliability and/or longevity may be particularly important for example where the rotating machine is located in an environment which is difficult or expensive to access. This may be the case for example in offshore wind turbines or other rotating machines which need to be located in remote or exposed locations.
Wired and wireless sensors are known in this context. Wired sensors, e.g. based on a mechanical slip ring, typically achieve high quality electrical connection but may be prone to wear or sparking, may be limited to lower rotational speeds, and/or may be relatively difficult to install. Wireless sensors do not have these limitations but transfer of signal and/or power reliably and efficiently is generally more difficult.
It is an object of the invention to provide systems and methods for transferring electrical signal or power to a rotatable component in a reliable and/or efficient manner.
According to an aspect of the invention, there is provided a system for transferring electrical signal or power to a rotatable component comprising: a rotatable component mounted so as to be rotatable about an axis of rotation; a receiver coil fixedly attached to the rotatable component; and a transmitter coil mounted so as not to rotate with the rotatable component, wherein the receiver coil or the transmitter coil encircles the axis of rotation of the rotatable component and a portion of the rotatable component; and wherein the receiver coil and the transmitter coil are positioned so that there is a magnetic inductive coupling between the receiver coil and the transmitter coil, thereby allowing transfer of electrical signal or power from the transmitter coil to the receiver coil during rotation of the rotatable component.
Configuring the receiver coil or transmitter coil so that it encircles the axis of rotation makes it possible for the magnetic inductive coupling between the two coils to be kept relatively constant during rotation of the rotatable component, thereby improving consistency and reliability of electrical signal or power transfer. Encircling a portion of the rotatable component improves the coupling between the two coils by providing a core material having a higher magnetic permeability than air, as well as providing additional flexibility for positioning the receiver coil or transmitter coil in comparison with arrangements which do not allow the receiver coil to encircle the axis except at positions on the axis where the rotatable component is not present.
In an embodiment, both the receiver coil and the transmitter coil encircle the axis of rotation. This facilitates good coupling between the receiver coil and the transmitter coil.
In an embodiment, both the receiver coil and the transmitter coil encircle a portion of the rotatable component. This facilitates reasonable coupling between the receiver coil and the transmitter coil, optionally also providing a core material within both of the coils that has a higher magnetic permeability than air.
In an embodiment, the transmitter coil is smaller than the receiver coil and positioned to one side of the axis of rotation of the rotatable element, such that the axis of rotation does not pass through the coil. This arrangement helps to localise the output from the transmitter coil and reduce interference with nearby components.
In an embodiment, the receiver coil is smaller than the transmitter coil and positioned to one side of the axis of rotation of the rotatable element, such that the axis of rotation does not pass through the coil. This arrangement helps to localise output from the receiver coil to the transmitter coil, which may be useful for example in embodiments where the receiver coil is used to transfer data to the transmitter coil, thereby reducing interference with nearby components.
In an embodiment, the receiver coil overlaps (at least partially) with the transmitter coil when viewed in a radial direction. This helps to achieve axial compactness and/or achieve good coupling between the coils.
According to an alternative aspect, there is provided a method of transferring electrical signal or power to a rotatable component rotating about an axis of rotation, the method comprising: providing a receiver coil fixedly attached to the rotatable component; and providing a transmitter coil which does not rotate with the rotatable component, wherein the receiver coil or the transmitter coil encircles the axis of rotation of the rotatable component and a portion of the rotatable component; the receiver coil and the transmitter coil are positioned so that there is a magnetic inductive coupling between the receiver coil and the transmitter coil; and the method comprises transferring electrical signal or power to the rotatable component using the magnetic inductive coupling between the receiver coil and the transmitter coil.
Embodiments of the invention will now be described, by way of example only, with reference to the accompanying drawings in which corresponding reference symbols indicate corresponding parts, and in which:
Figure 1 is a schematic perspective view of an example rotatable component and a system for transferring electrical signal or power to a receiver coil attached to the rotatable component;
Figure 2 is a schematic sectional view along an axis of rotation of the rotatable component of Figure 1 illustrating an example configuration for the transmitter and receiver coils;
Figure 3 is a schematic perspective view of an alternative system for transferring electrical signal or power to a receiver coil attached to the rotatable component;
Figure 4 is a schematic sectional view along an axis of rotation of the rotatable component shown in Figure 3 showing an example configuration for the transmitter and receiver coils;
Figure 5 is a schematic perspective view of a further alternative system for transferring electrical signal or power to a receiver coil attached to the rotatable component; and
Figure 6 is a schematic sectional view along an axis of rotation of the rotatable component shown in Figure 5 showing an example configuration for the transmitter and receiver coils.
Wireless power transfer using a magnetic inductive coupling is known in the context of charging systems for consumer electronics. See for example S. Hui, W. Zhong, and C. Lee, "A critical review of recent progress in mid-range wireless power transfer," Power Electronics, IEEE Transaction on, vol. 29, pp. 4500-4511, 2014. The Qi standard, which is defined and certified by the industrial alliance ofWireless Power Consortium (WPC), is suitable for relatively short distance induction charging. See for example P. Manivannan and S. Bharathiraja, "Qi Open Wireless Charging Standard-A Wireless Technology for the Future," International Journal of Engineering and Computer Science, vol. 2, p. 7, 2013.
Signal or power transfer using a magnetic inductive coupling can comprise either resonant or non-resonant induction. Arrangements which make use of resonant induction will need components that form a circuit capable of resonance. For example, a capacitor may be provided in series with a coil to form an LC self-resonant circuit. The performance of such a circuit will be optimal at or near the resonant frequency of the circuit. Arrangements which are based on non-resonant induction do not need a self-resonant circuit and can be understood by considering the combination of a transmitter coil and a receiver coil as an air-cored transformer. Any of the embodiments discussed below can be implemented using resonant or non-resonant induction. However, non-resonant induction may be preferred in many practical applications due to electromagnetic compatibility or safety constraints.
In the non-resonant case, considering a transmitter coil and a receiver coil as an air-cored transformer, if an alternating current flows in the transmitter coil, the generated varying magnetic field will induce a fluctuating voltage across the receiver coil. The magnitude of the induced voltage will depend on the mutual inductance, M, between the coils, the self-inductance of the coils, respectively Lir and Lrt for the transmitter and receiver coils, and the coupling coefficient k, the ratio of magnetic flux though the receiver coil to the total flux generated by the transmitter coil. Kk= 1, the two coils are perfectly coupled as in an ideal transformer. \fk> 0.5, the two coils are regarded as closely-coupled. The two coils are said to be loosely-coupled \ik< 0.5.
The ratio of the voltage on the transmitter coil to the voltage on the receiver coil is defined as
For the transmitter and receiver coils in coaxial alignment, the coupling coefficient k is given by the following expression:
where A is the eoil eross-sectional area, d is the separation between the eoils, r is the coil radius, μο is the magnetic permeability of free space, and iV is in the number of coil turns. The coefficient (/, d) takes into account the effect of a magnetic core inside a coil, and depends on d and the excitation frequency f. A ferrite core increases the magnetic flux of the coils and acts as a guide for the magnetic field, thereby increasing the magnetic inductive coupling between the two coils.
The coupling coefficient k is significantly influenced by the relative positioning of the coils.
Relevant factors include the separation distance between the coils d, lateral misalignment, and relative orientations. Short separation distance and good alignment encourages efficient power transfer.
Arranging for magnetic inductive coupling to be used to transfer signal or power between a transmitter coil and a receiver coil in the context of rotating machines presents unique challenges. The present inventors have recognised that efficient signal or power transfer is nevertheless possible if careful consideration is given to how the receiver and transmitter coils are configured.
In an embodiment, as shown for example in Figures 1 to 6, there is provided a system for transferring electrical signal or power. The system comprises a rotatable component 2 mounted so as to be rotatable about an axis of rotation 5. In the examples of Figures 1 to 6 the rotatable component 2 comprises a shaft 10 and a propeller. The propeller comprises a hub 6 and blades 8. Arrow 4 depicts schematically a direction of angular rotation of the propeller about the axis 5. In an embodiment, the propeller is part of an energy generation system, such as a wind turbine. In other embodiments, the rotatable components may take various other forms and/or be provided for other purposes. A common feature however is that the rotatable component 2 is configured to be rotatable about an axis of rotation 5. A receiver coil 14 is fixedly attached to the rotatable component 2. In the examples shown in Figures 1 to 6, the receiver coil 14 is attached to the drive shaft 10. However, in general the receiver coil 14 could be attached to any portion of the rotatable component 2. A transmitter coil 16 is mounted so as not to rotate with the rotatable component 2. Thus, it is possible to rotate the rotatable component 2 without rotating the transmitter coil 16. For example, the rotatable component 2 may be configured to be rotatable relative to an environment in which the system for transferring electrical signal or power is to be installed, whereas the transmitter coil 16 may be mounted so as to be stationary relative to this environment. In a case where the rotatable component 2 comprises blades of a wind turbine, for example, the environment may be the site in which the wind turbine is to be installed.
In an embodiment, the receiver coil 14 encircles the axis of rotation 5 of the rotatable component 2 and a portion of the rotatable component 2. Examples of such an embodiment are shown in Figures 1-4. In these examples, the receiver coil 14 encircles a portion of the shaft 10 of the rotatable component 2. In a further embodiment, the transmitter coil 16 encircles the axis of rotation 5 of the rotatable component 2 and a portion of the rotatable component 2. Examples of such an embodiment are shown in Figures 1, 2, 5 and 6.
In these examples, the transmitter coil 16 encircles a portion of the shaft 10 of the rotatable component 2.
The receiver and transmitter coils 14 and 16 are positioned so that there is a magnetic inductive coupling (resonant or non-resonant) between the receiver coil 14 and the transmitter coil 16. The magnetic inductive coupling between the coils allows transfer of electrical signal or power from the transmitter coil 16 to the receiver coil 14 during rotation of the rotatable component 2. As described in detail above, the magnetic inductive coupling can be achieved by positioning the transmitter coil 16 relatively close to the receiver coil 14 and providing good alignment between the transmitter coil 16 and the receiver coil 14. Configuring the receiver coil 14 or the transmitter coil 16 so that it encircles the axis of rotation 5 of the rotatable component 2 makes it possible for the quality of the inductive coupling between the two coils to be kept relatively constant during rotation of the rotatable component 2. Furthermore, the encircling of a portion of the rotatable component 2 improves the coupling between the two coils by providing a material having a higher magnetic permeability than air in the magnetic circuit. The improvement in the inductive coupling will be particularly high where the portion of the rotatable component 2 being encircled by the receiver coil 14 or the transmitter coil 16 has a high magnetic permeability, such as would be the case for a magnetic material such as a ferrite material.
In an embodiment, the receiver coil 14 and the transmitter coil 16 are configured such that a mutual inductance between the receiver coil 14 and the transmitter coil 16 is substantially independent of the angle of rotation of the rotatable component 2 about the axis of rotation 5. This has been achieved in the particular examples shown in Figures 1 to 6 by arranging for at least one of the receiver coil 14 and transmitter coil 16 to be substantially circular and coaxial with the axis 5 when viewed along the axis 5. The arrangement results in the geometry of the receiver coil 14 remaining constant in the reference frame of the transmitter coil 16 during rotation of the rotatable component 2 (Figures 1-4), or in the geometry of the transmitter coil 14 remaining constant in the reference frame of the receiver coil 16 during rotation of the rotatable component 2 (Figures 1,2, 5 and 6), which results in the mutual inductance between the two coils also remaining constant. Maintaining a constant mutual inductance ensures that power and signal can be transferred between the two coils consistently during rotation of the rotatable component 2. Such consistent power or signal transfer is much more difficult to achieve where neither the receiver coil nor the transmitter coil encircles the axis of rotation 5 and the portion of the rotatable component 2.
Configuring the receiver coil 14 so that it encircles not only the axis 5 but also a portion of the rotatable component 2, in embodiments where this is the case, provides greater flexibility for positioning the receiver coil 14. For example, the receiver coil 14 is not restricted to positions along the axis 5 where the rotatable component 2 is not present, i.e. beyond the axial extremities of the rotatable component 2. Furthermore, positioning the receiver coil 14 so that it surrounds the portion of the rotatable component 2 can enhance the coupling between the receiver coil 14 and a transmitter coil 16, as discussed above, due to the enhanced magnetic permeability provided by the portion of the rotatable component 2 within the receiver 14 coil.
Configuring the transmitter coil 16 so that it encircles not only the axis 5 but also a portion of the rotatable component 2, in embodiments where this is the case, provides greater flexibility for positioning the transmitter coil 16. For example, the transmitter coil 16 is not restricted to positions along the axis 5 where the rotatable component 2 is not present, i.e. beyond the axial extremities of the rotatable component 2. Furthermore, positioning the transmitter coil 16 so that it surrounds the portion of the rotatable component 2 can enhance the coupling between the receiver coil 14 and a transmitter coil 16, as discussed above, due to the enhanced magnetic permeability provided by the portion of the rotatable component 2 within the transmitter coil 16.
In an embodiment, as shown for example in Figures 1 and 2, both the receiver coil 14 and the transmitter coil 16 encircle the axis of rotation 5.
In embodiments of this type, as also shown in Figures 1 and 2, both the receiver coil 14 and the transmitter coil 16 may additionally encircle a portion of the rotatable component 2. In the particular example of Figures 1 and 2 it can be seen that the receiver and transmitter coils 14 and 16 both encircle a portion of the drive shaft 10. However, either or both of the transmitter and receiver coils 14 and 16 could encircle other portions of the rotatable component 2.
Arranging for both the receiver coil 14 and transmitter coils 16 to encircle the axis of rotation 5 facilitates optimal coupling between the receiver coil 14 and the transmitter coil 16. The receiver coil 14 and the transmitter coil 16 may have substantially the same size, orientation, and/or shape as each other, which promotes efficient magnetic inductive coupling between the two coils. In embodiments, the cross-sectional area of the receiver coil 14 when viewed along the axis of rotation 5 of the rotatable component 2 is within 20%, of the cross-sectional area of the transmitter coil 16 when viewed along the axis of rotation 5 of the rotatable component 2, optionally within 10%, optionally within 5%, optionally within 1%. In the particular example shown in Figures 1 and 2, the receiver coil 14 has a circular shape (when viewed along axis 5) that is coaxial with the axis 5. The transmitter coil 16 also has a circular shape (when viewed along axis 5) that is coaxial with the axis 5. In the particular example shown, the radius of the receiver coil 14 is slightly smaller than the radius of the transmitter coil 16. However, this is not essential. The receiver and transmitter coils 14, 16 may have the same radius or the receiver coil 14 may have a larger radius than the transmitter coil 16. In other embodiments, the shapes and/or sizes of the transmitter and receiver coils may be different.
In the particular example of Figures 3 and 4, the transmitter coil 16 is configured so as not to encircle the axis of rotation 5 (i.e. such that the axis of rotation 5 does not pass through the coil 16) nor encircle any portion of the rotatable component 2. This arrangement may be desirable where there is concern that an output from the transmitter coil 16 may interfere with other nearby electrical components. In such an embodiment, the transmitter coil 16 may be made smaller than the receiver coil 14, which is facilitated by the fact that the transmitter coil 16 does not need to encircle the axis of rotation 5 and a portion of the rotatable component 2, thereby tending to localise an output from the transmitter coil 16 and reduce the risk of interference. Alternatively or additionally, this arrangement may be desirable where space is limited in the region around the rotatable component 2.
In the particular example of Figures 5 and 6, the receiver coil 14 is configured so as not to encircle the axis of rotation 5 (i.e. such that the axis of rotation 5 does not pass through the coil 14) nor encircle any portion of the rotatable component 2. This arrangement may be desirable where there is concern that an output from the receiver coil 14 may interfere with other nearby electrical components. In such an embodiment, the receiver coil 14 may be made smaller than the transmitter coil 16, which is facilitated by the fact that the receiver coil 16 does not need to encircle the axis of rotation 5 and a portion of the rotatable component 2, thereby tending to localise an output from the receiver coil 14 and reduce the risk of interference. Alternatively or additionally, this arrangement may be desirable where space is limited in the region around the rotatable component 2.
In an embodiment, the receiver coil 14 and the transmitter coil 16 overlap when viewed in a radial direction, as shown in the examples of Figures 3-6. Thus, at least a portion of the transmitter coil 16 is located at the same axial position (or range of axial positions) as at least a portion of the transmitter coil 16. This helps to achieve axial compactness and/or achieve good coupling between the coils 14 and 16.
The receiver coil 14 may be configured to provide power to, or exchange signals with, a variety of different components on the rotatable component 2. In the particular example shown in Figures 1 to 6, the receiver coil 14 is configured to provide power to a sensor 18. It is envisaged that the sensor 18 could be configured to perform a variety of different measurements. However, embodiments of the invention may be particularly desirable where the sensor 18 is configured to perform measurements involving relatively high power consumption, for example measurements involving high data rates, for example measurements of dynamic properties of a component in real time. The measurements may be for the purposes of monitoring the condition (eg. pertaining to structural health) of a rotating component during rotation of the component.
The transmitter coil 16 may be connected to the wide variety of different apparatuses depending on the particular application in question. In the examples shown in Figures 1 to 6, the transmitter coil 16 is connected to a signal or power transfer unit 20, which is configured to provide power or exchange signals with the receiver coil 14 and/or, in turn, the sensor 18. In embodiments the signal or power transfer unit 20 is configured to transfer signal or power from the transmitter coil 16 to the receiver coil 14 using non-resonant magnetic induction. In other embodiments the signal or power transfer unit 20 is configured to transfer signal or power from the transmitter coil 16 to the receiver coil 14 using resonant magnetic induction.
In the above description, reference to transfer of electrical signal refers to transfer of electrical voltage or current which has been modulated in order to carry information. Reference to transfer of electrical power refers to transfer of electrical voltage or current for the purposes of powering a device and which does not necessarily convey any information. Any of the embodiments of the invention can be configured to transfer electrical signal only, electrical power only or both electrical signal and electrical power.
The above examples show arrangements in which only one of the receiver coils 14 and only one of the transmitter coils 16 are provided. This is not essential. In other examples one or more further receiver coils 14 is/are provided and/or one or more further transmitter coils 16 is/are provided.
The features defined in the claims can be used together in any combination.
Claims (27)
1. A system for transferring electrical signal or power to a rotatable component comprising: a rotatable component mounted so as to be rotatable about an axis of rotation; a receiver coil fixedly attached to the rotatable component; and a transmitter coil mounted so as not to rotate with the rotatable component, wherein the receiver coil or the transmitter coil encircles the axis of rotation of the rotatable component and a portion of the rotatable component; and wherein the receiver coil and the transmitter coil are positioned so that there is a magnetic inductive coupling between the receiver coil and the transmitter coil, thereby allowing transfer of electrical signal or power from the transmitter coil to the receiver coil during rotation of the rotatable component.
2. The system of claim 1, wherein the receiver coil and the transmitter coil are configured such that a mutual inductance between the receiver coil and the transmitter coil is substantially independent of the angle of rotation of the rotatable component about the axis of rotation.
3. The system of claim 1 or 2, wherein the receiver coil encircles the axis of rotation.
4. The system of claim 3, wherein the receiver coil encircles a portion of the rotatable component.
5. The system of claim 1 or 2, wherein the receiver coil is smaller than the transmitter coil and the axis of rotation does not pass through the receiver coil.
6. The system of claim 1 or 2, wherein the transmitter coil encircles the axis of rotation.
7. The system of claim 6, wherein the transmitter coil encircles a portion of the rotatable component.
8. The system of any of claims 1-4, wherein transmitter coil is smaller than the receiver coil and the axis of rotation does not pass through the transmitter coil.
9. The system of any preceding claim, wherein the receiver coil and the transmitter coil overlap when viewed in a radial direction.
10. The system of any preceding claim, wherein the cross-sectional area of the receiver coil when viewed along the axis of rotation of the rotatable component is within 20% of the cross-sectional area of the transmitter coil when viewed along the axis of rotation of the rotatable component.
11. The system of any of the preceding claims, wherein any combination of two or more of the following are coaxial with each other: the rotatable component, the receiver coil, the transmitter coil.
12. The system of any of the preceding claims, further comprising a signal or power transfer unit, wherein the signal or power transfer unit is configured to transfer signal or power from the transmitter coil to the receiver coil using non-resonant magnetic induction.
13. The system of any of claims 1 -11, further comprising a signal or power transfer unit, wherein the signal or power transfer unit is configured to transfer signal or power from the transmitter coil to the receiver coil using resonant magnetic induction.
14. A method of transferring electrical signal or power to a rotatable component rotating about an axis of rotation, the method comprising: providing a receiver coil fixedly attached to the rotatable component; and providing a transmitter coil which does not rotate with the rotatable component, wherein the receiver coil or the transmitter coil encircles the axis of rotation of the rotatable component and a portion of the rotatable component; the receiver coil and the transmitter coil are positioned so that there is a magnetic inductive coupling between the receiver coil and the transmitter coil; and the method comprises transferring electrical signal or power to the rotatable component using the magnetic inductive coupling between the receiver coil and the transmitter coil.
15. The method of claim 14, wherein the mutual inductance between the receiver coil and the transmitter coil remains constant during rotation of the rotatable component about the axis of rotation.
16. The method of claims 14 or 15, wherein the receiver coil encircles the axis of rotation during the transfer of signal or power to the rotatable component using the magnetic inductive coupling.
17. The method of claim 16, wherein the receiver coil encircles a portion of the rotatable component during the transfer of signal or power to the rotatable component using the magnetic inductive coupling.
18. The method of claim 14 or 15, wherein receiver coil is smaller than the transmitter coil and the axis of rotation does not pass through the receiver coil.
19. The method of elaim 14 or 15, wherein the transmitter coil encircles the axis of rotation during the transfer of signal or power to the rotatable component using the magnetic inductive coupling.
20. The method of claim 19, wherein the transmitter coil encircles a portion of the rotatable component during the transfer of signal or power to the rotatable component using the magnetic inductive coupling.
21. The method of any of claims 14-17, wherein the transmitter coil is smaller than the receiver coil and the axis of rotation does not pass through the transmitter coil.
22. The method of any of claims 14-21, wherein the cross-sectional area of the receiver coil when viewed along the axis of rotation of the rotatable component is within 20% of the cross-sectional area of the transmitter coil when viewed along the axis of rotation of the rotatable component.
23. The method of any of claims 14-22, wherein any combination of two or more of the following are positioned so as to be coaxial with each other during the transfer of signal or power to the rotatable component using the magnetic inductive coupling: the rotatable component, the receiver coil, the transmitter coil.
24. The method of any of claims 14-23, wherein the magnetic inductive coupling comprises a non-resonant coupling.
25. The method of any of claims 14-23, wherein the magnetic inductive coupling comprises a resonant coupling.
26. A system for transferring electrical signal or power configured and/or arranged to operate substantially as hereinbefore described with reference and/or as illustrated in the accompanying drawings.
27. A method of transferring electrical signal or power substantially as hereinbefore described with reference to and/or as illustrated in the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1513106.3A GB2540624A (en) | 2015-07-24 | 2015-07-24 | System and methods for transferring electrical signal or power to a rotatable component |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1513106.3A GB2540624A (en) | 2015-07-24 | 2015-07-24 | System and methods for transferring electrical signal or power to a rotatable component |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB201513106D0 GB201513106D0 (en) | 2015-09-09 |
| GB2540624A true GB2540624A (en) | 2017-01-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1513106.3A Withdrawn GB2540624A (en) | 2015-07-24 | 2015-07-24 | System and methods for transferring electrical signal or power to a rotatable component |
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| GB (1) | GB2540624A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CZ308445B6 (en) * | 2017-09-29 | 2020-08-26 | Západočeská Univerzita V Plzni | Device for contactless transmission of electrical energy to a rotating part |
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| US20020125061A1 (en) * | 2001-03-08 | 2002-09-12 | Sumitomo Wiring Systems, Ltd. | Steering wheel electrical power transmission and signal exchange device |
| JP2003068546A (en) * | 2001-08-24 | 2003-03-07 | Sony Corp | Rotary transformer and manufacturing method thereof |
| US20090114204A1 (en) * | 2005-05-23 | 2009-05-07 | Kazumasa Ohnishi | Cutting tool and cutting device that have disk-like cutting blade |
| JP2010268531A (en) * | 2009-05-12 | 2010-11-25 | Nagano Japan Radio Co | Power transmission system |
| WO2012039635A1 (en) * | 2010-09-23 | 2012-03-29 | Powerbyproxi Limited | A contactless power transfer system |
| KR20130064872A (en) * | 2011-12-09 | 2013-06-19 | 주식회사 포스코 | Electromagnetic coupled resonance type wirelessly power transmission system |
| EP2919555A1 (en) * | 2014-03-11 | 2015-09-16 | Hamilton Sundstrand Corporation | Resistive-inductive propeller blade de-icing system including contactless power supply |
-
2015
- 2015-07-24 GB GB1513106.3A patent/GB2540624A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020125061A1 (en) * | 2001-03-08 | 2002-09-12 | Sumitomo Wiring Systems, Ltd. | Steering wheel electrical power transmission and signal exchange device |
| JP2003068546A (en) * | 2001-08-24 | 2003-03-07 | Sony Corp | Rotary transformer and manufacturing method thereof |
| US20090114204A1 (en) * | 2005-05-23 | 2009-05-07 | Kazumasa Ohnishi | Cutting tool and cutting device that have disk-like cutting blade |
| JP2010268531A (en) * | 2009-05-12 | 2010-11-25 | Nagano Japan Radio Co | Power transmission system |
| WO2012039635A1 (en) * | 2010-09-23 | 2012-03-29 | Powerbyproxi Limited | A contactless power transfer system |
| KR20130064872A (en) * | 2011-12-09 | 2013-06-19 | 주식회사 포스코 | Electromagnetic coupled resonance type wirelessly power transmission system |
| EP2919555A1 (en) * | 2014-03-11 | 2015-09-16 | Hamilton Sundstrand Corporation | Resistive-inductive propeller blade de-icing system including contactless power supply |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CZ308445B6 (en) * | 2017-09-29 | 2020-08-26 | Západočeská Univerzita V Plzni | Device for contactless transmission of electrical energy to a rotating part |
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| Publication number | Publication date |
|---|---|
| GB201513106D0 (en) | 2015-09-09 |
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