CN117254321A - Wireless power supply slip ring device applied to special environment - Google Patents
Wireless power supply slip ring device applied to special environment Download PDFInfo
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- CN117254321A CN117254321A CN202311283770.7A CN202311283770A CN117254321A CN 117254321 A CN117254321 A CN 117254321A CN 202311283770 A CN202311283770 A CN 202311283770A CN 117254321 A CN117254321 A CN 117254321A
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- 239000011810 insulating material Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 239000011229 interlayer Substances 0.000 claims 5
- 239000010410 layer Substances 0.000 claims 1
- 230000008878 coupling Effects 0.000 abstract description 58
- 238000010168 coupling process Methods 0.000 abstract description 58
- 238000005859 coupling reaction Methods 0.000 abstract description 58
- 230000005540 biological transmission Effects 0.000 abstract description 22
- 230000007246 mechanism Effects 0.000 description 31
- 230000005684 electric field Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 8
- 238000004088 simulation Methods 0.000 description 7
- 239000003990 capacitor Substances 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 6
- 238000005299 abrasion Methods 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000002500 effect on skin Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R39/00—Rotary current collectors, distributors or interrupters
- H01R39/02—Details for dynamo electric machines
- H01R39/08—Slip-rings
- H01R39/10—Slip-rings other than with external cylindrical contact surface, e.g. flat slip-rings
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Abstract
A wireless power supply slip ring device applied to special environments relates to a wireless power supply slip ring device applied to characteristic environments. The invention aims to solve the problem that a magnetic field coupling type system is restricted in the problems of dynamic density and electromagnetic interference. The invention comprises a first sandwich disc structure and a second sandwich disc structure, which are arranged side by side. The invention belongs to the technical field of wireless power transmission.
Description
Technical Field
The invention relates to a wireless power supply slip ring device applied to a characteristic environment, and belongs to the technical field of wireless power transmission.
Background
In special environments such as outer space spacecraft, wind power generation, petroleum drilling and the like, special equipment in a rotating state is required to be powered by a rotating slip ring. The existing rotating slip rings are mostly conductive slip rings in physical contact, and have the defects of high cost, abrasion during working, easiness in generating abrasive dust and the like, so that the service life of the rotating equipment is limited.
The wireless power transmission technology can fundamentally solve the problems of inter-ring short circuit, electrostatic discharge and the like in a slip ring power supply mode by virtue of the advantages of non-contact power supply, and further improve the reliability of a power supply unit of the equipment. Meanwhile, through the optimal design of the wireless power supply coupling mechanism, the multipath conductive rings are replaced, the overall weight of the power supply unit can be effectively reduced, and the light-weight design is realized.
In recent years, various nationists have studied the application of magnetic field coupling (Inductive power transfer, IPT) wireless power supply technology to the problem of wireless power supply of rotating slip rings, and have achieved some results. However, IPT systems have also been found to suffer from problems such as power density and electromagnetic interference: such as a varying magnetic field induced eddy currents, resulting in power losses; the energy-transfer magnetic field is easy to radiate outside the WPT system, so that the EMI problem is increased; IPT generally requires strands to reduce the skin effect and ferrite to guide the magnetic field, adding to the weight and cost of the system.
The electric field coupling type wireless power transmission technology (Capacitive power transfer, CPT) has the advantages of strong electromagnetic interference resistance, small volume and light weight, is beneficial to miniaturization and heat dissipation design, is easy to realize energy transmission simultaneously, and has great potential in the field of rotary wireless power supply in special environments.
Disclosure of Invention
The invention provides a wireless power supply slip ring device applied to special environments, which aims to solve the problem that a magnetic field coupling type system is limited in dynamic density and electromagnetic interference.
The technical scheme adopted by the invention for solving the problems is as follows: the invention comprises a first sandwich disc structure and a second sandwich disc structure, which are arranged side by side.
Further, the first sandwich disc structure comprises a first transmitting polar plate, a first energy receiving plate, a first rotating shaft and a first shaft sleeve;
the first emitter plate is fixedly sleeved on the first rotating shaft, the first shaft sleeve is coaxially sleeved on the first rotating shaft, the first rotating shaft and the first shaft sleeve can rotate relatively, a cavity is formed in the first energy receiving plate, the first emitter plate is arranged in the cavity, the first energy receiving plate is connected with the rotating equipment body through the first shaft sleeve, one end of the first rotating shaft is connected with the energy input end, and the other end of the first rotating shaft is connected with the equipment body.
Further, the second sandwich disc structure comprises a second transmitting polar plate, a second energy receiving plate, a second rotating shaft and a second sleeve;
the second transmitting polar plate is fixedly sleeved on the second rotating shaft, the second shaft sleeve is coaxially sleeved on the second rotating shaft, the second rotating shaft and the second shaft sleeve can rotate relatively, a cavity is formed in the second energy receiving plate, the second transmitting polar plate is arranged in the cavity, the second energy receiving plate is connected with the rotating equipment body through the second shaft sleeve, one end of the second rotating shaft is connected with the energy input end, and the other end of the second rotating shaft is connected with the equipment body.
Further, the first transmitting electrode plate, the second transmitting electrode plate, the first energy receiving plate and the second energy receiving plate are all made of copper plate materials.
Further, the outer surfaces of the first and second emitter plates are covered with a layer of insulating material.
The beneficial effects of the invention are as follows:
1. compared with the traditional circular coupling mechanism, the sandwich disc structure provided by the invention has the advantages that as the energy receiving polar plate is wrapped around the energy emitting polar plate, in the energy transmission process, electric charges can almost uniformly flow from the energy emitting polar plate to the energy receiving polar plate; in the traditional circular coupling mechanism, because the energy transmitting polar plate and the energy receiving polar plate are arranged in parallel, partial charges flow to the external environment at the edge of the polar plate in the energy transmission process, so that electric field dissipation is caused, and equipment in the surrounding environment is damaged; therefore, compared with the traditional circular coupling mechanism, the sandwich type disc structure can obviously reduce the electric field dissipation in the energy transmission process under the same condition, thereby improving the safety in the energy transmission process;
2. in the traditional circular coupling mechanism, only one surface of the energy transmitting polar plate is in opposite relation with the energy receiving polar plate; in the sandwich-type disc structure, however, three planes of the outer surface of the energy transmitting electrode plate are in opposite relation with different planes of the energy receiving electrode plate, and more coupling paths exist; therefore, under the condition of consuming the same polar plate area, the sandwich type disc structure can generate larger equivalent coupling capacitance and has higher utilization rate to the polar plate area;
3. the traditional rotary power supply slip ring in the special environment adopts contact power supply, the system has high cost, large weight, easy abrasion and short service life, the existing wireless power supply slip ring based on the magnetic coupling type wireless power transmission technology has the defects of large eddy current loss, high heat generation and the like, and the rotary power supply slip ring adopting the electric field coupling type wireless power transmission technology has strong electromagnetic interference resistance, small volume, light weight and low cost, thereby fundamentally overcoming the problems of abrasion and abrasive dust in the power supply of the rotary slip ring in the special environment, reducing the cost and the weight of a power supply device and providing a solution with great potential for improving the service life of the rotary power supply device in the special environment;
4. the energy receiving end of the coupling mechanism is in an enclosing state to the energy emitting end of the coupling mechanism, so that the energy transmitting end of the coupling mechanism can play a role in shielding, electric field dissipation in the energy transmission process is greatly reduced, and safety in the energy transmission process is improved;
5. in the sandwich type coupling mechanism, the three outer side surfaces of the energy transmitting polar plate are in opposite relation with the energy receiving polar plate, so that the coupling capacitance of the unit coupling polar plate area is greatly improved, the required coupling polar plate area is smaller under the condition of generating the same coupling capacitance, and the weight and cost of the coupling polar plate can be greatly reduced;
6. the CLLC-CL resonant compensation network is adopted, constant voltage output irrelevant to load can be realized, and even if the load of the system fluctuates, the energy output can be kept unchanged, so that the stability of the system is greatly improved;
7. the invention is based on the electric field coupling type wireless power transmission technology, and utilizes a sandwich disc structure to wirelessly supply power to rotary equipment in a special environment; in the sandwich type disc structure, an energy emission polar plate is connected with a rotating shaft which is connected with a rotating equipment body and an energy input end, so as to play a role in energy emission; the connectable collecting plate is connected with the rotating equipment body through the connecting sleeve and is kept relatively static with the rotating equipment body, so as to play a role in energy receiving; the system realizes constant voltage output irrelevant to load by adopting a CLLC-CL type resonance compensation network; compared with a coupling mechanism of a traditional rotary electric field coupling type wireless power transmission system, the sandwich disc structure provided by the invention can greatly reduce electric field dissipation in the energy transmission process, and can improve the utilization ratio of a coupling capacitor to the area of a coupling polar plate by 90%.
Drawings
FIG. 1 is a schematic view of a sandwich-type disk structure
FIG. 2 is a schematic view showing the disassembly of the sandwich-type disk structure
FIG. 3 is a CLLC-CL resonant compensation network;
FIG. 4 is a schematic diagram of six capacitances produced by a quadrupole plate;
FIG. 5 is a schematic diagram of a CLLC-CL resonant compensation network after decoupling the coupling mechanism according to a pi-type equivalent network;
FIG. 6 is a charge flow direction comparison of a sandwich disk structure with a conventional structure, FIG. 6a is a schematic diagram of a conventional structure, and FIG. 6b is a schematic diagram of a sandwich disk structure;
FIG. 7 is a schematic diagram of the simulation model size of a conventional circular coupling mechanism of a control group;
FIG. 8 is a schematic illustration of experimental sandwich-type disk structure simulation model dimensions;
FIG. 9 is a graph showing the comparison of the electric field dissipation levels of two coupling mechanisms, and FIG. 9a is a graph showing the comparison of the electric field dissipation levels of a conventional structure; fig. 9b is a schematic diagram showing the comparison of the electric field dissipation degree of the sandwich disc structure.
Detailed Description
The first embodiment is as follows: referring to fig. 1 and 2, a wireless power supply slip ring device for special environment according to the present embodiment includes a first sandwiched disc structure and a second sandwiched disc structure, where the first sandwiched disc structure and the second sandwiched disc structure are arranged side by side.
The second embodiment is as follows: referring to fig. 1 and 2, the first disc structure of the wireless power supply slip ring device for special environment according to the present embodiment includes a first transmitting plate P1, a first energy receiving plate P3, a first rotating shaft 1 and a first shaft sleeve 2;
the first transmitting polar plate P1 is fixedly sleeved on the first rotating shaft 1, the first shaft sleeve 2 is coaxially sleeved on the first rotating shaft 1, the first rotating shaft 1 and the first shaft sleeve 2 can rotate relatively, a cavity is formed in the first energy receiving plate P3, the first transmitting polar plate P1 is arranged in the cavity, the first energy receiving plate P3 is connected with the rotating equipment body through the first shaft sleeve 2, one end of the first rotating shaft 1 is connected with the energy input end, and the other end of the first rotating shaft 1 is connected with the equipment body.
The first energy transmitting polar plate P1 is connected with the first rotating shaft 1 to play a role in energy transmission, and the first energy receiving polar plate P3 is connected with the rotating equipment body through the first shaft sleeve 2 and keeps relatively static with the rotating equipment body to play a role in energy receiving.
And a third specific embodiment: referring to fig. 1 and 2, the second disc structure of the wireless power supply slip ring device for special environment according to the present embodiment includes a second transmitting polar plate P2, a second energy receiving plate P4, a second rotating shaft 3 and a second sleeve 4;
the second transmitting polar plate P2 is fixedly sleeved on the second rotating shaft 3, the second shaft sleeve 4 is coaxially sleeved on the second rotating shaft 3, the second rotating shaft 3 and the second shaft sleeve 4 can rotate relatively, a cavity is formed in the second energy receiving plate P4, the second transmitting polar plate P2 is arranged in the cavity, the second energy receiving plate P4 is connected with the rotating equipment body through the second shaft sleeve 4, one end of the second rotating shaft 3 is connected with the energy input end, and the other end of the second rotating shaft 3 is connected with the equipment body.
The second energy transmitting polar plate P2 is connected with the second rotating shaft 3 to play a role of energy transmission, and the second energy receiving polar plate P4 is connected with the rotating device body through the second shaft sleeve 4 and keeps relatively static with the rotating device body to play a role of energy receiving.
The specific embodiment IV is as follows: referring to fig. 1 and 2, a description is given of the present embodiment, where the first transmitting electrode plate P1, the second transmitting electrode plate P2, the first energy receiving plate P3 and the second energy receiving plate P4 of the wireless power supply slip ring device for special environment application are all made of copper plate materials.
By the arrangement, the weight and the cost of the energy transmission system are reduced while the mechanical strength requirement of the rotating mechanism is met.
Fifth embodiment: referring to fig. 1 and 2, the present embodiment is described, in which the outer surfaces of the first transmitting electrode plate P1 and the second transmitting electrode plate P2 of the wireless power supply slip ring device for special environment application are covered by a layer of insulating material.
The insulating material layer can prevent electric breakdown accidents in the energy transmission process, and ensure the safety and stability of the system.
Principle of operation
As shown in fig. 3, the transmitting end is composed of two inductance devices L 1 And L f1 And two capacitance devices C f1 And C ex1 The receiving end consists of an inductance device L 2 And a capacitor device C ex2 Composition is prepared. U (U) in For transmitting end DC power supply, U out For the direct-current output voltage after rectification at the output end, U 1 Is the inverted input end alternating voltage, U 2 Is the output end alternating voltage before rectification. Due to the compensation capacitance, the port equivalent parallel capacitance of the energy input and output ends can be marked as C in1 ＝C ex1 +C 1 、C in2 ＝C ex2 +C 2 . Analyzing the parameter relation of the resonance compensation network element, firstly modeling a coupling mechanism; since the coupling mechanism can actually be considered to have two sets of "transmit-receive" plates, a total of four metal plates; these four blocksThe metal plate can produce six equivalent coupling capacitances, as shown in fig. 4; in order to simplify the calculation, the six capacitors are decoupled into three capacitors by utilizing a formula shown in the formula (1), and a pi-type equivalent network is further formed; the CLLC-CL type resonance compensation network after decoupling the coupling mechanism according to the pi type network is shown in figure 5.
When the system works at the resonant frequency, the primary inductance L f1 With primary capacitance C f1 Constructing parallel resonance as shown in formula (2); at this time 1/jωC f1 ＝jωL f1 Therefore, the primary resonance inductance value L in1 ＝L 1 -L f1 . Primary inductance L in1 、L f1 And C in1 、C in2 、C M Forms parallel resonance, secondary side inductance L 2 And C 1 、C 2 、C M The parallel resonance is constituted as shown in formula (3).
ω 2 C f1 L f1 ＝1 (2)
The network can realize constant voltage output irrelevant to load under the condition of meeting the conditions, namely ZPA (Zero Phase Angle) state, U 2 And U 1 The relation of (2) is shown as a formula (4);
because the full-bridge inversion and full-bridge rectification are adopted, U in 、U out And U 1 、U 2 The relationship between them can be expressed as the form shown in formula (5);
substituting the formula (5) into the formula (4) to obtain a rectified output voltage calculation formula shown as a formula (6);
the superior performance of the sandwich disc structure in terms of reducing electric field dissipation is verified by finite element simulation analysis:
in Maxwell, establishing a simulation model; an experimental group (a sandwich type disc structure) and a control group (a traditional circular coupling mechanism structure) are arranged, the size schematic diagram of the traditional disc type coupling mechanism is shown in fig. 7, the radius of a disc is 100mm, the diameter of a reserved hole of an inner layer for a circular shaft is 10mm, the distance between a transmitting disc and a receiving disc on the same polar side is 5mm, and the distance between disc groups between different transmitting-receiving loops is 5mm. The size schematic diagram of the sandwich type disc coupling mechanism is shown in fig. 8, the radius of a circular ring at a transmitting end is 100mm, the radius of a sandwich layer at a receiving end is 104mm, the distance between the upper layer of sandwich layer and the lower layer of sandwich layer at the receiving end and an energy transmitting end is 5mm respectively, and the distance between disc groups between different transmitting-receiving loops is 5mm. Both sets of simulation models apply a voltage stress of 10V at the energy transmitting plate and a voltage stress of 5V at the energy receiving plate.
The electric field dissipation of the two sets of coupling mechanisms is shown in fig. 9. As can be seen from fig. 9, the electric field dissipation degree of the sandwich-type disc structure is far smaller than that of the conventional circular coupling mechanism, the influence on the external environment is smaller, and the process of energy transmission is safer.
The equivalent capacitance value at the unit plate area can be utilized to reflect the utilization of the coupling capacitance with respect to the coupling plate. The total area value of the coupling mechanism of the traditional circular coupling mechanism participating in coupling is as follows: (pi.times.100) 2 -π×10 2 )×4＝39600π(mm 2 ) Six coupling capacitance values are shown in table 1. The total area value of the coupling mechanism of the sandwich type disc structure participating in coupling is 2×
(π×104 2 ×2+2π×105×10+π×100 2 -π×10 2 ×3)＝66864π(mm 2 ) Six coupling capacitance values are shown in table 2. Due to the fact that in pi-type etcOf the three capacitors in the effective network, the equivalent capacitor C M Mainly plays a role of energy transmission, so that the equivalent capacitance C under the area of the unit polar plate can be selected M The values were used as a comparison standard. From the data in tables 1 and 2, it can be calculated that the equivalent capacitance C is the equivalent of the conventional circular coupling mechanism per unit plate area M The value was 5.72X10 -4 pF/π·mm 2 Equivalent capacitance C under unit polar plate area of sandwich type disc structure M The value was 1.087X 10 -3 pF/π·mm 2 . It can be seen that the equivalent capacitance C under the unit plate area of the sandwich-type disc structure M The value is 1.9 times of that of the traditional disc type coupling mechanism, and the surface of the disc type coupling mechanism can generate larger equivalent coupling capacitance under the same coupling polar plate area; meanwhile, the sandwich-type disc structure requires smaller coupling plate area under the condition of generating the same equivalent coupling capacitance. The material consumption of the coupling mechanism can be greatly reduced, so that the weight and the cost of the coupling mechanism are reduced.
TABLE 1 simulation results of six capacitance values of conventional circular coupling mechanism
TABLE 2 simulation results of six capacitance values for sandwich disk structure
The present invention is not limited to the preferred embodiments, but is capable of modification and variation in detail, and other embodiments, such as those described above, of making various modifications and equivalents will fall within the spirit and scope of the present invention.
Claims (5)
1. A wireless power supply slip ring device applied to special environments is characterized in that: the wireless power supply slip ring device applied to the special environment comprises a first interlayer disc structure and a second interlayer disc structure, and the first interlayer disc structure and the second interlayer disc structure are arranged side by side.
2. A wireless powered slip ring apparatus for specialty environments applications as defined in claim 1 wherein: the first sandwich disc structure comprises a first transmitting polar plate (P1), a first energy receiving plate (P3), a first rotating shaft (1) and a first shaft sleeve (2);
the first emitter plate (P1) is fixedly sleeved on the first rotating shaft (1), the first shaft sleeve (2) is coaxially sleeved on the first rotating shaft (1), the first rotating shaft (1) and the first shaft sleeve (2) can rotate relatively, a cavity is formed in the first energy receiving plate (P3), the first emitter plate (P1) is arranged in the cavity, the first energy receiving plate (P3) is connected with the equipment body through the first shaft sleeve (2), one end of the first rotating shaft (1) is connected with the energy input end, and the other end of the first rotating shaft (1) is connected with the equipment body.
3. A wireless powered slip ring apparatus for specialty environments applications as defined in claim 1 wherein: the second interlayer disc structure comprises a second transmitting polar plate (P2), a second energy receiving plate (P4), a second rotating shaft (3) and a second shaft sleeve (4);
the second transmitting polar plate (P2) is fixedly sleeved on the second rotating shaft (3), the second shaft sleeve (4) is coaxially sleeved on the second rotating shaft (3), the second rotating shaft (3) and the second shaft sleeve (4) can rotate relatively, a cavity is formed in the second energy receiving plate (P4), the second transmitting polar plate (P2) is arranged in the cavity, the second energy receiving plate (P4) is connected with the equipment body through the second shaft sleeve (4), one end of the second rotating shaft (3) is connected with the energy input end, and the other end of the second rotating shaft (3) is connected with the equipment body.
4. A wireless powered slip ring apparatus for specialty environments applications according to claim 2 or 3, wherein: the first emitter plate (P1), the second emitter plate (P2), the first energy receiving plate (P3) and the second energy receiving plate (P4) are all made of copper plate materials.
5. A wireless powered slip ring apparatus for specialty environments applications according to claim 2 or 3, wherein: the outer surfaces of the first emitter plate (P1) and the second emitter plate (P2) are covered with a layer of insulating material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311283770.7A CN117254321A (en) | 2023-10-07 | 2023-10-07 | Wireless power supply slip ring device applied to special environment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311283770.7A CN117254321A (en) | 2023-10-07 | 2023-10-07 | Wireless power supply slip ring device applied to special environment |
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| CN117254321A true CN117254321A (en) | 2023-12-19 |
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| CN202311283770.7A Pending CN117254321A (en) | 2023-10-07 | 2023-10-07 | Wireless power supply slip ring device applied to special environment |
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2023
- 2023-10-07 CN CN202311283770.7A patent/CN117254321A/en active Pending
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