Nested decoupling coil and slip ring wireless power and signal synchronous transmission system

Abstract

This invention belongs to the field of wireless power transmission technology and relates to a nested decoupling coil and slip ring wireless power and signal synchronization transmission system, comprising: an outer stator, an inner rotor, and four sets of solenoid coils; the four sets of solenoid coils are a power transmitting coil, a primary signal coil, a power receiving coil, and a secondary signal coil; the inner rotor is nested inside the outer stator, and magnetic cores are provided on the outer stator and the inner rotor; the power transmitting coil and the primary signal coil are wound on the outer stator, and the power receiving coil and the secondary signal coil are wound on the inner rotor; the primary signal coil is wound in reverse series on both sides of the power transmitting coil, and the secondary signal coil is wound in reverse series on both sides of the power receiving coil; this invention proposes a nested solenoid based on reverse series winding, which makes the induced voltages generated by the power coil in the signal coil cancel each other out, thereby achieving decoupling between the power coil and the signal coil.

Description

Technical Field

[0001] This invention belongs to the field of wireless power transmission technology and relates to a nested decoupling coil and slip ring wireless power and signal synchronous transmission system. Background Technology

[0002] With the rapid development of industrial automation, the Internet of Things (IoT), and high-end equipment manufacturing, the core role of rotating equipment (such as oil drilling equipment, radar antennas, aerospace equipment, and wind turbine blades) in various systems is becoming increasingly prominent. These rotating devices require the transfer of electrical energy from the stator side to the rotor side during operation. Traditionally, this transfer occurs primarily through physical contact and sliding friction between the stator brushes and rotating slip rings. However, this power supply method leads to increased contact surface temperature, severe wear, and the generation of electrical sparks, thereby reducing the safety, reliability, and service life of the slip rings.

[0003] Wireless Power Transfer (WPT) technology enables contactless power transfer, offering advantages such as flexible and reliable power supply. It is widely used in electric vehicles, unmanned underwater vehicles, drones, and portable smart devices. Using WPT technology in slip rings enables contactless power transfer between the stator and rotor, making power supply safer, more reliable, and extending the slip ring's lifespan. For slip ring WPT systems, information exchange between the transmitting and receiving sides is crucial for real-time monitoring of system status and reliable operation. While traditional wireless communication methods such as Wi-Fi, Bluetooth, and ZigBee are widely used, they suffer from long pairing times and high transmission latency, making them unsuitable for slip ring WPT systems requiring real-time feedback. Simultaneous Wireless Power and Data Transfer (SWPDT) technology offers advantages such as short transmission latency, no need for complex pairing, and more secure signal transmission, providing unique advantages in extreme environments such as aerospace, underwater, and deep-earth applications (e.g., high-temperature oil drilling equipment).

[0004] Regarding the application of slip ring SWPDT, reference

[16] "LIU Zhe, NIE Ruimin, XIAO Zhuangsheng et al. A 6.78 MHz Full-duplex simultaneous capacitive power and data transfer system for rotary steerable drilling application[J] IEEE Transactions on Power Electronics, 2025, 40(12):18499-18511" proposed a shared channel type full-duplex capacitive SWPDT system for rotary steerable drilling; reference

[17] "FAN Yuanshuang, HU Hongsheng, SUN Yue, et al. A simultaneous wireless power and coil inductance insensitive data transfer system for rotary structures[J]. IEEE Transactions on Power Electronics, 2024, 39(5): 6526–6536" designed an LCCLC compensation topology and its slip ring SWPDT system that can improve the robustness of the system; reference

[18] "JIA Jianbo, JIA Yahui, LI Xiaofei. Analysis, design, and experimental verification A parallel wireless power and data transmission method for rotary steering systems[J]. Energies, 2022, 15(17):6349” designed a slip ring SWPDT system with output voltage closed-loop control. In the above study, power and signal share the same transmission channel based on frequency division multiplexing mechanism. Its advantage is that no additional signal coupling mechanism needs to be designed, which simplifies the hardware structure and reduces the system cost and design complexity. However, the shared channel method has the problem of large interference of power to signal and difficulty in suppression. The use of separate channels for power and signal can reduce power-signal crosstalk.

[0005] Regarding the research on the separated channel slip ring SWPT, the literature

[21] "Cheng Hao, Zhou Wei, Zhang Zeheng, et al. A parallel wireless power and signal transmission technology for rotating mechanisms based on planar-curved decoupled coils [J]. Journal of Electrical Engineering, 2025, 40(14):4395-4405" proposed a planar-curved decoupled coil. The literature

[22] "LI Xiaofei, LI Zhiheng, MADAWALA UK, et al. A simultaneous wireless power and data transfer method utilizing a novel coupler design for rotary steerable systems [J]. IEEE Transactions on Power Electronics, 2024, 39(9): 11824-11833" designed a decoupled structure of semi-cylindrical stator coil and quarter-cylindrical rotor coil. In the two documents mentioned above, the power coil and the signal coil are decoupled from each other. This method can reduce the interference of power on signal transmission. However, the mutual inductance of these two structures is unstable when rotating, resulting in unstable output power. Furthermore, signal errors may occur at certain rotation angles. Summary of the Invention

[0006] To address the aforementioned problems in the prior art, this invention employs a nested decoupling coil, comprising: an outer stator, an inner rotor, and four sets of solenoid coils; the four sets of solenoid coils are a power transmitting coil, a primary signal coil, a power receiving coil, and a secondary signal coil; the inner rotor is nested inside the outer stator, and magnetic cores are provided on both the outer stator and the inner rotor; the power transmitting coil and the primary signal coil are wound on the outer stator, and the power receiving coil and the secondary signal coil are wound on the inner rotor; the primary signal coil is wound in reverse series on both sides of the power transmitting coil, and the secondary signal coil is wound in reverse series on both sides of the power receiving coil.

[0007] Another aspect of the present invention employs a slip-ring wireless power and signal synchronization transmission system, comprising: a nested decoupling coil, a power transmitting circuit, a power receiving circuit, a first signal transmission circuit, and a second signal transmission circuit; the power transmitting circuit is connected to the power transmitting coil of the nested decoupling coil, and the power receiving circuit is connected to the power receiving coil of the nested decoupling coil, forming a power transmission channel; the first signal transmission circuit is connected to the primary signal coil of the nested decoupling coil, and the second signal transmission circuit is connected to the secondary signal coil of the nested decoupling coil, forming a signal transmission channel.

[0008] Beneficial effects:

[0009] 1. This invention proposes a nested solenoid structure based on reverse series winding, with the primary signal coil L... dp The power transmitting coil L is wound in reverse series. p On both sides, the secondary signal coil L ds It is wound in reverse series on the power receiving coil L s The primary signal coil is wound on both sides of the power transmitting coil. The number of turns, wire diameter, and spacing between the primary signal coil and the power transmitting coil are strictly symmetrical. The secondary signal coil is wound on both sides of the power receiving coil. The number of turns, wire diameter, and spacing between the secondary signal coil and the power receiving coil are strictly symmetrical. This winding method makes the induced voltage generated by the power coil in the signal coil cancel each other out, thereby achieving decoupling between the power coil and the signal coil and greatly reducing the interference of power transmission on signal transmission. 2. This invention combines a nested solenoid structure wound in reverse series, a compensation network, and a filter network to construct a stable slip ring SWPDT system. The coordinated cooperation of the nested solenoid structure wound in reverse series, the compensation network, and the filter network can ensure the stability of signal gain and output power when the slip ring rotates. Attached Figure Description

[0010] Figure 1 This is an overall schematic diagram of the nested decoupling coil provided in an embodiment of the present invention;

[0011] Figure 2 An exploded view of the nested decoupling coil provided in an embodiment of the present invention;

[0012] Figure 3 This is a schematic diagram of the reverse series connection of nested decoupling coils provided in an embodiment of the present invention;

[0013] Figure 4 A schematic diagram of the magnetic flux distribution generated by the signal coil of a nested decoupling coil provided in an embodiment of the present invention;

[0014] Figure 5 A schematic diagram of the stator-side coil cross-section of a nested decoupling coil provided in an embodiment of the present invention;

[0015] Figure 6 This is a schematic diagram illustrating the relationship between the mutual inductance and rotation angle among the coils of a nested decoupling coil provided in an embodiment of the present invention.

[0016] Figure 7 This is an overall schematic diagram of a slip ring wireless power and signal synchronization transmission system based on nested decoupling coils provided in an embodiment of the present invention.

[0017] Figure 8 A schematic diagram of the equivalent circuit of the power transmission channel provided in an embodiment of the present invention;

[0018] Figure 9 This is a schematic diagram of the signal forward transmission channel circuit provided in an embodiment of the present invention;

[0019] Figure 10 This is a schematic diagram of the simulation waveforms of system-related voltages and currents provided in an embodiment of the present invention;

[0020] Figure 11 A flowchart for system parameter design provided in an embodiment of the present invention;

[0021] Figure 12 A schematic diagram showing the dimensions of the nested decoupling coil provided in an embodiment of the present invention;

[0022] Figure 13 This is a schematic diagram of power transmission-related waveforms provided in an embodiment of the present invention;

[0023] Figure 14 This is a schematic diagram of the power transmission waveforms related to dynamic load changes provided in an embodiment of the present invention.

[0024] Figure 15 A schematic diagram illustrating power and efficiency under different loads provided in embodiments of the present invention;

[0025] Figure 16 This is a schematic diagram showing the output power and efficiency of the inner cylinder rotor during rotation, as provided in an embodiment of the present invention.

[0026] Figure 17 This is a schematic diagram of the forward transmission waveform of a signal provided in an embodiment of the present invention;

[0027] Figure 18 This is a schematic diagram of the waveforms of the power channel and the signal channel during synchronous power and signal transmission, provided in an embodiment of the present invention.

[0028] Figure 19 This is a schematic diagram of waveforms for testing transmission delay at two signal transmission rates provided in an embodiment of the present invention;

[0029] Figure 20 This is a schematic diagram of the signal-to-noise ratio test waveform provided in an embodiment of the present invention;

[0030] Figure 21 The sampling signal U provided in the embodiments of the present invention dr1 A schematic diagram of FFT analysis;

[0031] Figure 22 This is a schematic diagram of the signal reverse transmission waveform provided in an embodiment of the present invention. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] Example 1:

[0034] like Figure 1 As shown, this embodiment of the invention employs a nested decoupling coil, comprising: an outer stator, an inner rotor, and four sets of solenoid coils; the four sets of solenoid coils are energy transmitting coils L. p Primary signal coil L dp Power receiving coil L s and secondary signal coil L ds The inner rotor is nested inside the outer stator, and magnetic cores are provided on both the outer stator and the inner rotor; for example... Figure 2 As shown, the power transmitting coil L p and primary signal coil L dp The power receiving coil L is wound on the outer stator. s and secondary signal coil L ds Winded on the inner rotor; such as Figure 3 As shown, the primary signal coil L dp The power transmitting coil L is wound in reverse series. p On both sides, the secondary signal coil L ds It is wound in reverse series on the power receiving coil L s The primary signal coil is wound on both sides of the power transmitting coil, and the number of turns, wire diameter, and spacing between the sub-coils and the power transmitting coil are strictly symmetrical. Similarly, the secondary signal coil is wound on both sides of the power receiving coil, and the number of turns, wire diameter, and spacing between the sub-coils and the power receiving coil are strictly symmetrical. This winding method ensures that the induced voltages generated by the power coil in the signal coil cancel each other out, thereby decoupling the power coil from the signal coil and greatly reducing the interference of power transmission on signal transmission. Furthermore, this nested solenoid structure ensures stable mutual inductance during rotation, guaranteeing stable output power when the slip ring rotates.

[0035] Taking the power coil and signal coil on the stator side as an example, the decoupling characteristics of the two are illustrated, and a schematic diagram of the magnetic flux distribution of the primary signal coil on the stator side is drawn as follows. Figure 4 As shown. Figure 4 Middle I dt1The excitation current of the primary signal coil is denoted by . Due to the reverse-connected winding of the signal coils, the excitation currents on both sides of the signal coil are in opposite directions. According to the right-hand screw rule, the left signal coil generates a magnetic flux to the right inside the power coil, and the right signal coil generates a magnetic flux to the left inside the power coil. Therefore, the magnetic fluxes generated by the left and right signal coils in the power coil are of the same magnitude but opposite in direction, canceling each other out, thus achieving physical decoupling between the electrical energy and the signal coil.

[0036] To further prove mathematically that the stator-side power coil and signal coil are decoupled, this invention will calculate the mutual inductance between the power coil and the signal coil based on the Newman formula. Figure 5 A schematic diagram of the stator side coil cross-section is given. The power coil and signal coil satisfy the equation of a circular curve. Figure 5 In the diagram, α1, α2, and α3 represent the angles along the positive x-axis at any point on the curves of coil-1, coil-2, and coil-3, respectively. Coil-1 is the power coil, and coils-2 and-3 are... Figure 4 The signal coils on the left and right sides of the middle.

[0037] Let N1, N2, and N3 be the number of turns of coil-1, coil-2, and coil-3, respectively, and let D be the diameter of coil-1, coil-2, and coil-3. Then the parametric equations of coil-1, coil-2, and coil-3 can be expressed as:

[0038]

[0039]

[0040]

[0041] in, , , These are the coordinates of coil-1, coil-2, and coil-3, respectively.

[0042] According to the Newman formula, mutual inductance can be expressed as:

[0043]

[0044] Among them, M i-j The mutual inductance between coil-i and coil-j L is the free permeability. i and L j Let dL represent the length vectors of coil-i and coil-j, respectively. i and dL j r are infinitesimals of coil-i and coil-j, respectively.ij dL i and dL j The distance between them, then the cross-coupling mutual inductance between the power coil and the signal coil is expressed as:

[0045]

[0046] According to the formula Mutual inductance M can be obtained 1-2 and M 1-3 The expression is

[0047]

[0048]

[0049] In the formula and For x i and y i The derivative of r, i=1,2,3. ij It can be represented as

[0050]

[0051] Mode and The direction of integration in M ​​is determined by the winding direction of the coil (i.e., the direction of the excitation current). These formulas can be solved using numerical integration functions in MATLAB, and the result can be obtained through calculation. 1-23 for

[0052]

[0053] To achieve complete decoupling, the two counter-connected signal sub-coils must maintain strict symmetry in terms of the number of turns, wire diameter, and spacing from the power coil. Simultaneously, considering that increasing the number of turns in the signal coil leads to a significant increase in inter-turn parasitic capacitance, causing a sharp drop in the coil's self-resonant frequency and affecting the compensation network's operation, and considering the space constraints in practical slip ring applications, this invention selects 2 turns for the signal coil. This invention uses COMSOL simulation calculations to obtain the changes in mutual inductance between the coils during the rotor's rotation around the central axis from 0-360°, as shown below. Figure 6 As shown, the coil parameters are as follows: Figure 12 And Table 1. Where M p-dp M is the cross-coupling mutual inductance between the power transmitting coil and the primary signal coil. p-ds M is the cross-coupling mutual inductance between the power transmitting coil and the secondary signal coil. s-dpM is the cross-coupling mutual inductance between the power receiving coil and the primary signal coil. s-ds These are the cross-coupling mutual inductances between the power receiving coil and the secondary signal coil.

[0054] Figure 6 (a) represents M ps With M dps It remains stable during rotation, varying around 39.4 μH and 0.268 μH respectively, enabling stable transmission of electrical energy and signals. Figure 6 As shown in (b), the mutual inductance of each cross-coupling is less than 0.01 μH, which can be ignored. The above simulation results further verify the decoupling characteristics between the power coil and the signal coil.

[0055] Example 2:

[0056] like Figure 7 As shown, this embodiment of the invention employs a slip-ring wireless power and signal synchronization transmission system based on the aforementioned nested decoupling coil, comprising: a nested decoupling coil, a power transmitting circuit, a power receiving circuit, a first signal transmission circuit, and a second signal transmission circuit; the power transmitting circuit is connected to the power transmitting coil of the nested decoupling coil, and the power receiving circuit is connected to the power receiving coil of the nested decoupling coil, forming a power transmission channel; the first signal transmission circuit is connected to the primary signal coil of the nested decoupling coil, and the second signal transmission circuit is connected to the secondary signal coil of the nested decoupling coil, forming a signal transmission channel.

[0057] The power transmission circuit includes: DC power supply U dc Series compensation capacitor C p And full-bridge inverters (S1-S4); DC power supply U dc The positive terminal is connected to the positive DC input terminal of the full-bridge inverter, and the DC power supply U... dc The negative terminal is connected to the negative DC input terminal of the full-bridge inverter; the positive AC output terminal of the full-bridge inverter is connected to the series compensation capacitor C. p One end, a compensation capacitor C is connected in series. p The other end is connected to one end of the power transmitting coil of the nested decoupling coil, and the negative AC output terminal of the full-bridge inverter is connected to the other end of the power transmitting coil of the nested decoupling coil.

[0058] The power receiving circuit includes: filter capacitor C L Load resistance R L And a full-bridge rectifier (D1-D4); the positive AC input terminal of the full-bridge rectifier is connected to one end of the power receiving coil of the nested decoupling coil, and the negative AC input terminal of the full-bridge rectifier is connected to the other end of the power receiving coil of the nested decoupling coil; the positive DC output terminal of the full-bridge rectifier is connected to the filter capacitor C. L and load resistance RL At one end, the negative terminal of the DC output of the full-bridge rectifier is connected to the filter capacitor C. L and load resistance R L The other end.

[0059] The power transmission channel adopts a series-compensated topology, that is, the power transmitting circuit uses a series compensation capacitor C. p The receiving circuit is uncompensated. This topology has the advantages of simple structure, high efficiency, and good constant voltage output characteristics. Among them, L... p For the self-inductance of the power transmitting coil, L s R is the self-inductance of the power receiving coil. p With R s M represents the internal resistance of the transmitting and receiving coils, respectively. ps The transmitting and receiving coils are mutually inducted.

[0060] The first signal transmission circuit includes: a single-pole double-throw switch SW1 and a voltage source U. dt1 Series compensation capacitor C dt1 Parallel compensation capacitor C dr2 and sampling resistor R d2 Sampling resistor R d2 With parallel compensation capacitor C dr2 Parallel connection, sampling resistor R d2 and parallel compensation capacitor C dr2 One end is connected to the first selection terminal (port 1) of the single-pole double-throw switch SW1, and the sampling resistor R d2 and parallel compensation capacitor C dr2 The other end is connected to voltage source U dt1 One end of the primary signal coil of the nested decoupling coil and one end of the voltage source U dt1 The other end is connected to a series compensation capacitor C dt1 One end, a compensation capacitor C is connected in series. dt1 The other end is connected to the second selection terminal (port 2) of the single-pole double-throw switch SW1, and the common terminal of the single-pole double-throw switch SW1 is connected to the other end of the primary signal coil of the nested decoupling coil.

[0061] The second signal transmission circuit includes: a single-pole double-throw switch SW2 and a modulation signal U. dt2 Series compensation capacitor C dt2 Parallel compensation capacitor C dr1 and sampling resistor R d1 Sampling resistor R d1 With parallel compensation capacitor C dr1 Parallel connection, sampling resistor R d1 and parallel compensation capacitor C dr1 One end is connected to the first selection terminal (port 4) of the single-pole double-throw switch SW2, and the sampling resistor R d1and parallel compensation capacitor C dr1 The other end is connected to voltage source U dt2 One end of the secondary signal coil of the nested decoupling coil, voltage source U dt2 The other end is connected to a series compensation capacitor C dt2 One end, a compensation capacitor C is connected in series. dt2 The other end is connected to the second selection terminal (port 3) of the single-pole double-throw switch SW2, and the common terminal of the single-pole double-throw switch SW2 is connected to the other end of the secondary signal coil of the nested decoupling coil.

[0062] The aforementioned signal transmission channel achieves half-duplex signal transmission through single-pole double-throw switches SW1 and SW2, with the primary signal coil L shared for both forward and reverse signal transmission. dp and secondary signal coil L ds During forward signal transmission, SW1 is connected to port 2, and SW2 is connected to port 4. At this time, the forward signal transmission channel mainly consists of the modulated signal U. dt1 Series compensation capacitor C dt1 Parallel compensation capacitor C dr1 and sampling resistor R d1 Composition. During reverse signal transmission, SW1 connects to port 1, and SW2 connects to port 3. At this time, the reverse signal transmission channel mainly consists of the modulated signal U. dt2 Series compensation capacitor C dt2 Parallel compensation capacitor C dr2 and sampling resistor R d2 Composition. Among them, M dps For the mutual inductance between the primary and secondary signal coils, R dp With R ds These are the internal resistances of the primary and secondary signal coils, respectively. To simplify signal modulation, this invention employs Amplitude-Shift Keying (ASK) modulation.

[0063] Because the series-compensated capacitor topology used on the transmitting side has good low-pass filtering characteristics and can effectively filter out high-order harmonics introduced by the inverter, this invention uses the fundamental frequency approximation method to model the power transmission channel. The equivalent circuit of the power transmission channel is as follows: Figure 8 As shown. Figure 8 (a) is the equivalent circuit of mutual inductance under the fundamental frequency approximation of the power transmission channel, U in and U out These are the fundamental components of the inverter output voltage and the rectifier bridge input voltage, respectively. e This is the equivalent resistance of the rectifier bridge and the load. The transmitting and receiving coils have mutual inductance. The slip ring coupling mechanism designed in this invention is a tightly coupled structure, similar to a transformer. Using an LLC equivalent circuit makes it easier to describe the system characteristics. Figure 8 The mutual inductance equivalent circuit shown in (a) is further equivalent to the following: Figure 8 (b) shows the LLC equivalent circuit. Where, I p with I s L represents the current in the transmitting and receiving coils, respectively. r For equivalent leakage inductance, L m U1 is the equivalent magnetizing inductance, n is the equivalent primary-to-secondary turns ratio, and U1 and U2 are the input and output voltages of the LLC equivalent circuit, respectively.

[0064] In the equivalent circuit of LLC, L r L m The equivalent relationships between n and the parameters in the mutual inductance equivalent circuit are as follows:

[0065]

[0066] The resonance condition of the system circuit is

[0067]

[0068] In the formula, ω p =2πf p ω p and f p These are the system's operating angular frequency and frequency, respectively.

[0069] According to the fundamental frequency approximation method, U in U L and R e It can be represented as

[0070]

[0071] in, U represents the fundamental component of the input voltage. in The effective value phasor.

[0072] Based on the relationship between the transformer's input and output voltages and the turns ratio, at system resonance, the relationship between U1 and U2 is as follows:

[0073]

[0074] The input-output voltage relationship of the equivalent circuit of the power transmission channel is as follows:

[0075]

[0076] According to the formula and Calculate the system output voltage and output current for

[0077]

[0078] Mode This indicates that the system output voltage is only related to U. dc L s M ps It is relevant and can achieve constant voltage output regardless of load.

[0079] Let the system power loss be P. loss Then the system output power and efficiency It can be represented as

[0080]

[0081] From the formula It can be seen that L s U dc M ps R L R p R s These parameters determine the system's output power and efficiency, and these parameters need to be designed reasonably while meeting the requirements of power and efficiency.

[0082] The system proposed in this invention embodiment can realize half-duplex signal transmission. Due to the symmetry of the bidirectional signal transmission topology, the equivalent circuit structure of forward signal transmission and reverse signal transmission is the same. Therefore, the analysis mainly focuses on forward signal transmission as an example. The circuit topology of the forward signal transmission channel is as follows: Figure 9 As shown, the signal modulation method of this invention is ASK modulation. This method requires a stable and sufficient voltage amplitude for signal demodulation. Therefore, a series capacitor is used on the signal transmitting side to reduce the channel impedance and increase the high-frequency transmission current, while a parallel capacitor is used on the signal receiving side to increase the resonant impedance and obtain a sufficiently high sampling voltage amplitude. Wherein, I dt1 with I dr1 These are the currents in the signal transmitting coil and the receiving coil, respectively.

[0083] Define f d and ω d Let the operating frequency and angular frequency of the signal transmission channel be, respectively. Then the resonance condition of the signal transmission channel is:

[0084]

[0085] according to Figure 9 The KVL expression for the signal transmission channel can be obtained as follows:

[0086]

[0087] Input impedance Z of the signal transmission channel p Reflection impedance Z r Secondary impedance Z s It can be represented as

[0088]

[0089] In the signal transmission channel, due to R dp and R ds Very small, negligible, by formula - The sampling voltage U can be calculated. dr1 for

[0090]

[0091] Generally, the modulation signal U dt1 The formula remains unchanged after the system design is completed. This indicates that the signal sampling voltage is mainly composed of L ds With M dps The decision requires setting parameters appropriately to meet signal demodulation requirements.

[0092] According to the formula Calculate the gain G of the signal in the forward direction. d1 for

[0093]

[0094] Similarly, the gain G of signal reverse transmission d2 for

[0095]

[0096] Define SNR1 and SNR2 as the signal-to-noise ratios of the forward and reverse transmission channels, respectively. p1 This refers to the interference voltage of power transmission on the forward signal transmission, specifically expressed as the voltage across the sampling resistor R when power transmission is only in operation. d1 The voltage. U p2 This refers to the interference voltage of power transmission on the reverse signal transmission, specifically expressed as the sampling resistor R when power transmission is only in operation. d2 The voltage. U dr1 This indicates that sampling R only occurs during positive signal transmission. d1 voltage, U dr2 This indicates that R is sampled only during reverse signal transmission. d2The voltage. The signal-to-noise ratio can be expressed as...

[0097]

[0098] To intuitively analyze the transmission gain and signal-to-noise ratio of the signal transmission channel, a system simulation model was built in MATLAB / Simulink. The relevant parameters are shown in Table 1 of the experimental section.

[0099] Figure 10 Simulated waveforms of the relevant voltage and current of the system are presented. The forward modulation signal U is shown when the signal is transmitted alone. dt1 Forward sampling voltage U dr1 like Figure 10 As shown in (a), the inverse modulation signal U dt2 and reverse sampling voltage U dr2 The waveform is as follows Figure 10 As shown in (b). U dt1 and U dt2 Amplitude is 5 V, U dr1 and U dr2 The amplitudes are 17.8 V and 25 V, then according to the formula... and The forward channel gain can be calculated to be 11 dB, and the reverse channel gain to be 14 dB. (This is because...) and L in dp Greater than L ds Therefore, the reverse channel gain is greater than the forward channel gain, and the simulation results are consistent with the theoretical derivation.

[0100] This invention employs a half-duplex communication mode, eliminating crosstalk caused by simultaneous bidirectional signal transmission; interference in signal transmission primarily originates from power transmission. (U) dc Set to 270 V, modulation signal U dt1 and U dt2 When set to 0 V and only performing power transfer, the current I of the power receiving coil is... s Interference waveform U with the forward transmission channel of the signal p1 like Figure 10 As shown in (c), I s Amplitude is 20 A, U p1 Amplitude is 0.8 V; current I of the energy transmitting coil p Interference waveform U with the reverse transmission channel of the signal p2 like Figure 10 As shown in (d), I p Amplitude is 29 A, U p2 If the amplitude is 0.85 V, then according to the formula... The signal-to-noise ratios (SNRs) for the forward and reverse transmission channels can be calculated to be 26 dB and 29 dB, respectively. The above analysis shows that the signal channel can maintain a high SNR even when electrical energy and signals are transmitted simultaneously.

[0101] Example 3:

[0102] like Figure 11 As shown, this embodiment of the invention employs a parameter design method for a slip ring wireless power and signal synchronization transmission system, including:

[0103] Step 1: Set the DC power supply U according to the power requirements and load characteristics of the slip ring wireless power and signal synchronization transmission system. dc System frequency f p and load resistance R L ;

[0104] As shown in Table 1, DC power supply U dc 270V, system frequency f p 100kHz, load resistance R L It is 27 Ω.

[0105] Step 2: Determine the dimensions and number of turns of the power transmitting coil and the power receiving coil according to the installation space of the slip ring wireless power and signal synchronization transmission system;

[0106] Due to space constraints in slip ring installation, the designed coupling mechanism (i.e., nested decoupling coils) is as follows: Figure 12 As shown, d1 = 85mm is the diameter of the power receiving coil, d2 = 135mm is the diameter of the power transmitting coil, and l = 110mm is the height of the coupling mechanism.

[0107] Step 3: Calculate the self-inductance L of the power transmitting coil using COMSOL simulation. p , self-inductance L of the power receiving coil s And the mutual inductance M between the power transmitting and receiving coils ps ;

[0108] Step 4, based on Based on the self-inductance L of the electric energy transmitting coil p , self-inductance L of the power receiving coil s Mutual inductance M between the power transmitting and receiving coils ps and system frequency f p Calculate the series compensation capacitor C P Based on According to DC power supply U dc Load resistance R L , self-inductance L of the power receiving coil s And the mutual inductance M between the power transmitting and receiving coils ps Calculate the system output power Po and system output efficiency η;

[0109] The calculation of the series compensation capacitor includes: ;

[0110] Calculate the system output power P o The system output efficiency η includes: .

[0111] Step 5: Determine if P is satisfied. o If the power output is ≥3.3kW and η≥90%, and this condition is not met, then modify the number of turns in the power transmitting coil and the power receiving coil, and return to step 3; otherwise, change the current parameters of the power transmission channel (DC power supply U). dc System frequency f p Load resistance R L Dimensions and number of turns of the power transmitting coil and power receiving coil; self-inductance L of the power transmitting coil. p , self-inductance L of the power receiving coil s Mutual inductance M between the power transmitting and receiving coils ps Series compensation capacitor C p (This is used as the final parameter for the power transmission channel, and step 6 is executed.)

[0112] If the output power or efficiency does not meet the requirements, under the condition of fixed input voltage, operating frequency and load, the output power and efficiency can be improved by increasing or decreasing the number of coil turns in the simulation by adjusting the coil self-inductance and mutual inductance according to the theoretical model calculation formula, so as to meet the design requirements.

[0113] Step 6: Set the system frequency f according to the signal transmission rate and interference suppression requirements of the slip ring wireless power and signal synchronization transmission system. d Set voltage source U dt1 Voltage source U dt2 ;

[0114] As shown in Table 1, the system frequency f d It is 4MHz. U dt1 U dt2 When demodulation requirements are met, a 5V input is usually provided directly.

[0115] Step 7: Set the size and number of turns of the primary and secondary signal coils according to the installation space of the slip ring wireless power and signal synchronization transmission system;

[0116] Due to space constraints in slip ring installation, the designed coupling mechanism (i.e., nested decoupling coils) is as follows: Figure 12 As shown, d1 = 85mm is the diameter of the secondary signal coil, d2 = 135mm is the diameter of the primary signal coil, and l = 110mm is the height of the coupling mechanism.

[0117] Step 8: Calculate the self-inductance L of the primary signal coil using COMSOL simulation. ds Secondary signal coil self-inductance L dp Mutual inductance M between primary and secondary signal coils ps ;

[0118] Step 9, Based on According to the system frequency f d , self-inductance L of the primary signal coil ds Secondary signal coil self-inductance L dp And the mutual inductance M between the primary and secondary signal coils ps Calculate the series compensation capacitor C dt1 C dr1 and parallel compensation capacitor C dt2 C dr2 ;

[0119] Solve the equation Then the series compensation capacitor C can be obtained. dt1 C dr1 Similarly, the parallel compensation capacitor C can be obtained. dt2 C dr2 .

[0120] Step 10, Based on - Based on the self-inductance L of the primary signal coil ds Mutual inductance M between primary and secondary signal coils ps Calculate the gain G of the signal in the forward direction. d1 According to the self-inductance L of the secondary signal coil dp Mutual inductance M between primary and secondary signal coils ps Calculate the gain G of the signal in reverse propagation. d2 According to voltage source U dt1 , self-inductance L of the primary signal coil ds Mutual inductance M between primary and secondary signal coils ps Calculate the signal-to-noise ratio (SNR) 1 for the forward transmission of the signal; based on the voltage source U dt2 Secondary signal coil self-inductance L dp Mutual inductance M between primary and secondary signal coils ps Calculate the signal-to-noise ratio (SNR)² of the signal transmitted in the reverse direction.

[0121] Specifically, the gain G of the signal forward propagation is calculated. d1 include ;

[0122] Calculate the gain G of the signal in reverse propagation. d2 include: ;

[0123] Calculating the signal-to-noise ratio (SNR) 1 for forward transmission and the signal-to-noise ratio (SNR) 2 for reverse transmission includes: , , .

[0124] Step 11: Determine if SNR1≥15dB, SNR2≥15dB, and G are satisfied. d1 ≥0dB, G d2 ≥0dB; if not, modify the number of turns of the primary and secondary signal coils and return to step 9; otherwise, change the current parameters of the signal transmission channel (system frequency f). d Voltage source U dt1 Voltage source U dt2 Dimensions and number of turns of the primary and secondary signal coils; self-inductance L of the primary signal coil. ds Secondary signal coil self-inductance L dp Mutual inductance M between primary and secondary signal coils ps Series compensation capacitor C dt1 C dr1 and parallel compensation capacitor C dt2 C dr2 () serves as the final parameter for the signal transmission channel.

[0125] To verify the effectiveness of the invention, an experiment was conducted on a slip ring wireless power and signal synchronization transmission system. The power coil was wound with 0.05mm × 1050 strand Litz wire, with 12 turns each for the transmitting and receiving mechanisms. The signal coil was wound with 0.05mm × 600 strand Litz wire, with 2 turns each for the transmitting and receiving mechanisms. A total of 30 PC95 magnetic cores, each measuring 110mm × 20mm × 5mm, were placed on the outside of the stator and inside the rotor.

[0126] Table 1 System Experimental Parameters

[0127]

[0128] Power transmission performance analysis:

[0129] The main waveforms during power transmission are as follows: Figure 13 As shown, this includes the inverter output voltage U. in , transmitting coil current I p Receiver coil current I s With system output voltage U L The waveform. Figure 13 (a) represents the load R L The waveform at 27Ω, U in and U L The amplitudes are 270 V and 303 V respectively, Ip and I s The effective values ​​are 16.2 A and 12.1 A, respectively. Figure 13 (b) indicates the load R L The waveform at 40Ω, U in and U L The amplitudes are 270 V and 305 V respectively, I p and I s The effective values ​​are 13.4 A and 8.5 A, respectively.

[0130] Inverter output voltage U when the load on the power transmission channel changes dynamically in , transmitting coil current I p System output voltage U L With load current I L The waveform is as follows Figure 14 As shown. Figure 14 (a) shows the relevant waveforms as the load changes from 27 Ω to 33 Ω. Figure 14 (b) shows the relevant waveforms as the load changes from 33 Ω to 40 Ω. During the process of the load increasing from 27 Ω to 40 Ω, U... in No change, I p A decrease of approximately 2.8 A, I L A decrease of approximately 3.6 A, U L Rise by approximately 2 V, U L The fluctuation was only 0.6%. This indicates that the system output voltage remains stable when the load changes dynamically, verifying the constant voltage output characteristics of the power transmission channel.

[0131] Figure 15 The power and efficiency measured by the power analyzer under different loads are displayed in the power analyzer interface. dc1 and I dc1 These are the system's input voltage and current, U, respectively. dc2 and I dc2 P1 and P2 are the system's output voltage and current, respectively; P1 and P2 are the system's input and output power, respectively; and η1 is the system's DC-DC efficiency. Figure 15 (a) represents the data when the load is 27 Ω, U dc1 with I dc1 The values ​​are 269.3 V and 13.1 A, respectively. dc2 with I dc2 The voltages are 303.3 V and 11.2 A, respectively; P1 and P2 are 3.5 kW and 3.4 kW, respectively; and η1 is 96.2%. Figure 15 (b) represents the data when the load is 40 Ω, U dc1 with I dc1 The values ​​are 269.6 V and 9.0 A, respectively. dc2with I dc2 The voltages are 305.8 V and 7.7 A respectively, P1 and P2 are 2.4 kW and 2.3 kW respectively, and η1 is 96.4%. From Figure 15 It can be seen that the system's maximum output power is 3.4 kW, corresponding to a DC-DC efficiency of 96.2%. The system efficiency remains stable during load changes.

[0132] Figure 16 The output power and efficiency of the inner cylinder rotor during rotation show that the maximum output power is 3.42 kW and the minimum is 3.33 kW. Taking 3.4 kW as the standard value, the fluctuation is only 2%, which verifies the previous statement that maintaining stable mutual inductance during rotation can ensure stable power transmission. At the same time, the efficiency remains stable at around 96%, with a fluctuation of no more than 0.1%, indicating that the proposed system has excellent stability.

[0133] Signal transmission performance analysis:

[0134] Figure 17 This indicates that during forward signal transmission, the transmitted signal Tx1 and the modulated signal U... dt1 Sampling voltage U dr1 The waveform of the received signal Rx1. Figure 17 (a) shows the waveform when only the signal is transmitted. The signal transmission rate is 256 kbit / s. It can be seen that the signal can be transmitted and demodulated normally, indicating that the signal transmission performance can meet most communication needs. Figure 17 (b) shows the waveform when electrical energy and signal are transmitted synchronously. At this time, there is some switching noise interference in the signal channel, but it does not affect the normal transmission and demodulation of the signal. This verifies the decoupling characteristics between the power coil and the signal coil. The high-power transmission of the power channel will not affect the normal transmission of the signal.

[0135] To further evaluate the interference of power transmission on signal transmission, Figure 18 The waveforms of the power channel and signal channel when power and signal are transmitted synchronously are given. Figure 18 (a) represents the inverter output voltage U on the power transmitting side. in , transmitting coil current I p Modulation signal U dt1 And the waveform of the received signal Rx1. U in and I p The effective values ​​are 270 V and 16.2 A, respectively. The power transmission has little interference with signal transmission and does not affect the normal transmission and demodulation of the signal. Figure 18 (b) represents the output voltage U of the power receiving system. L Receiver coil current I s Modulation signal U dt1 And the waveform of the received signal Rx1. U Land I s The effective values ​​are 303 V and 12.1 A, respectively, and the signal transmission hardly affects the normal power transmission.

[0136] Figure 19 The transmission delay test is given for two signal transmission rates using the transmitted signal Tx1 and the modulated signal U. dt1 Sampling voltage U dr1 The waveform of the received signal Rx1. Figure 19 (a) shows the correlation waveform at a signal transmission rate of 256 kbit / s, with a transmission delay of about 1.4 μs for both transmission and reception. Figure 19 (b) shows the correlation waveform at a signal transmission rate of 460.8 kbit / s, with a transmission delay of approximately 1.45 μs for both transmission and reception. Figure 19 This indicates that the designed SWPDT system has low transmission delay. It is worth noting that the transmission delay increases slightly with increasing signal transmission rate. Although the signal can still be demodulated at a transmission rate of 460.8 kbit / s, bit errors may occur; therefore, the signal transmission rate should not be too high.

[0137] Figure 20 The inverter output voltage U for testing the signal-to-noise ratio is given. in , transmitting coil current I p Modulation signal U dr1 The waveform of the received signal Rx1. Since the signal transmission rate does not affect the signal-to-noise ratio, the signal transmission rate was set to 19.2 kbit / s in the experiment to better observe the signal-to-noise ratio of the signal transmission channel. Figure 20 (a) shows the waveform when only the signal is transmitted, U dr1 The amplitude is approximately 9V. Figure 20 (b) is the waveform when power and signal are transmitted synchronously. The amplitude of the power side interference is about 1.5 V. The signal-to-noise ratio of the forward transmission channel can be calculated to be 15.5 dB, which can meet most signal demodulation requirements.

[0138] Figure 21 The sampled signal U is given. dr1 The FFT analysis shows that the signal U at cursor 1 has a frequency of 4 MHz. dr1 The gain was 12.2 dB, and the experimental results were basically consistent with the simulation results.

[0139] Figure 22 The transmitted signal Tx2 and the modulated signal U are given during the reverse transmission of the signal. dt2 Sampling voltage U dr2 The waveform of the received signal Rx2. Wherein, Figure 22 (a) shows the waveform when only the signal is transmitted. Figure 22(b) shows the waveform when electrical energy and signals are transmitted synchronously. Figure 22 It can be seen that the signal can still be transmitted and demodulated normally at a rate of 256 kbit / s when transmitted in reverse, which verifies the feasibility of the proposed system operating in half-duplex mode.

[0140] System performance comparison:

[0141] Table 2 compares the proposed system with the existing slip ring SWPDT system in terms of communication mode, maximum communication rate, output power, transmission efficiency, and signal crosstalk. The comparison shows that the proposed system achieves kilowatt-level power and high-efficiency output while maintaining a high signal transmission rate. Furthermore, thanks to the decoupling design between the power and signal coils, it significantly reduces crosstalk in the signal channel.

[0142] Table 2 Comparison of SWPDT performance of slip rings

[0143]

[0144] In summary, this invention proposes a decoupled nested structure and its SWPDT system for slip rings, reducing interference from electrical energy to signal transmission and achieving stable transmission of electrical energy and signals during slip ring rotation. This invention analyzes the decoupling characteristics of the nested coil structure, establishes a circuit model for the electrical energy and signal transmission channels, analyzes the interference of electrical energy on the signal, provides a parameter design method for the system, and builds an experimental platform with an output power of 3.4 kW and a DC-DC efficiency of 96.2%. The output power fluctuation rate during slip ring rotation is less than 2%, and the DC-DC efficiency fluctuation rate is less than 0.1%. The signal-to-noise ratio of the forward signal transmission channel is 15.5 dB, and the transmission delay is 1.4 μs. Stable error-free transmission can be achieved in both the forward and reverse signal channels at a transmission rate of 256 kbit / s. Experimental results verify the feasibility and effectiveness of the proposed system.

[0145] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A nested decoupling coil, characterized in that, include: The system consists of an outer stator, an inner rotor, and four sets of solenoid coils. The four sets of solenoid coils are a power transmitting coil, a primary signal coil, a power receiving coil, and a secondary signal coil. The inner rotor is nested inside the outer stator. Magnetic cores are provided on both the outer stator and the inner rotor. The power transmitting coil and the primary signal coil are wound on the outer stator, while the power receiving coil and the secondary signal coil are wound on the inner rotor. The primary signal coil is wound in reverse series on both sides of the power transmitting coil, and the secondary signal coil is wound in reverse series on both sides of the power receiving coil.

2. The nested decoupling coil of claim 1, wherein, The number of turns, wire diameter, and spacing between the primary signal coil wound on both sides of the power transmitting coil and the power transmitting coil are symmetrical; the number of turns, wire diameter, and spacing between the secondary signal coil wound on both sides of the power receiving coil and the power receiving coil are symmetrical.

3. A slip ring radio energy and signal synchronous transmission system, characterized in that, include: The nested decoupling coil, power transmitting circuit, power receiving circuit, first signal transmission circuit, and second signal transmission circuit as described in any one of claims 1 to 2; the power transmitting circuit is connected to the power transmitting coil of the nested decoupling coil, and the power receiving circuit is connected to the power receiving coil of the nested decoupling coil, forming a power transmission channel; the first signal transmission circuit is connected to the primary signal coil of the nested decoupling coil, and the second signal transmission circuit is connected to the secondary signal coil of the nested decoupling coil, forming a signal transmission channel.

4. The slip ring wireless power and signal synchronization transmission system according to claim 3, characterized in that, The power transmission circuit includes: DC power supply U dc Series compensation capacitor C p And a full-bridge inverter; DC power supply U dc The positive terminal is connected to the positive DC input terminal of the full-bridge inverter, and the DC power supply U... dc The negative terminal is connected to the negative DC input terminal of the full-bridge inverter; the positive AC output terminal of the full-bridge inverter is connected to the series compensation capacitor C. p One end, a compensation capacitor C is connected in series. p The other end is connected to one end of the power transmitting coil of the nested decoupling coil, and the negative AC output terminal of the full-bridge inverter is connected to the other end of the power transmitting coil of the nested decoupling coil.

5. The slip ring wireless power and signal synchronization transmission system of claim 3, wherein, The power receiving circuit includes: filter capacitor C L Load resistance R L And a full-bridge rectifier; the positive terminal of the AC input of the full-bridge rectifier is connected to one end of the power receiving coil of the nested decoupling coil, and the negative terminal of the AC input of the full-bridge rectifier is connected to the other end of the power receiving coil of the nested decoupling coil; the positive terminal of the DC output of the full-bridge rectifier is connected to the filter capacitor C. L and load resistance R L At one end, the negative terminal of the DC output of the full-bridge rectifier is connected to the filter capacitor C. L and load resistance R L The other end.

6. The slip ring wireless power and signal synchronization transmission system of claim 3, wherein, The first signal transmission circuit includes: a single-pole double-throw switch SW1 and a voltage source U. dt1 Series compensation capacitor C dt1 Parallel compensation capacitor C dr2 and sampling resistor R d2 Sampling resistor R d2 With parallel compensation capacitor C dr2 Parallel connection, sampling resistor R d2 and parallel compensation capacitor C dr2 One end is connected to the first selection terminal of the single-pole double-throw switch SW1, and the sampling resistor R d2 and parallel compensation capacitor C dr2 The other end is connected to voltage source U dt1 One end of the primary signal coil of the nested decoupling coil and one end of the voltage source U dt1 The other end is connected to a series compensation capacitor C dt1 One end, a compensation capacitor C is connected in series. dt1 The other end is connected to the second selection terminal of the single-pole double-throw switch SW1, and the common terminal of the single-pole double-throw switch SW1 is connected to the other end of the primary signal coil of the nested decoupling coil.

7. The slip ring radio frequency and signal synchronization transmission system of claim 3, wherein, The second signal transmission circuit includes: a single-pole double-throw switch SW2 and a modulation signal U. dt2 Series compensation capacitor C dt2 Parallel compensation capacitor C dr1 and sampling resistor R d1 Sampling resistor R d1 With parallel compensation capacitor C dr1 Parallel connection, sampling resistor R d1 and parallel compensation capacitor C dr1 One end is connected to the first selection terminal of the single-pole double-throw switch SW2, and the sampling resistor R d1 and parallel compensation capacitor C dr1 The other end is connected to voltage source U dt2 One end of the secondary signal coil of the nested decoupling coil, voltage source U dt2 The other end is connected to a series compensation capacitor C dt2 One end, a compensation capacitor C is connected in series. dt2 The other end is connected to the second selection terminal of the single-pole double-throw switch SW2, and the common terminal of the single-pole double-throw switch SW2 is connected to the other end of the secondary signal coil of the nested decoupling coil.

8. A parameter design method for a slip ring wireless power and signal synchronization transmission system according to any one of claims 3 to 7, characterized in that, include: Step 1, according to the slip ring wireless power and signal synchronous transmission system power demand and load characteristics set DC power supply U dc , system frequency f p and load resistance R L ; Step 2: Determine the dimensions and number of turns of the power transmitting coil and the power receiving coil according to the installation space of the slip ring wireless power and signal synchronization transmission system; Step 3: Calculate the self-inductance L of the power transmitting coil. p , self-inductance L of the power receiving coil s And the mutual inductance M between the power transmitting and receiving coils ps ; Step 4: Based on the self-inductance L of the power transmitting coil p , self-inductance L of the power receiving coil s Mutual inductance M between the power transmitting and receiving coils ps and system frequency f p Calculate the series compensation capacitor C p According to DC power supply U dc Load resistance R L , self-inductance L of the power receiving coil s And the mutual inductance M between the power transmitting and receiving coils ps Calculate the system output power P o and system output efficiency η; Step 5: Determine if P is satisfied. o ≥3.3kW and η≥90%. If not, modify the number of turns of the power transmitting coil and the power receiving coil, and return to step 3. Otherwise, obtain the parameters of the power transmission channel of the slip ring wireless power and signal synchronization transmission system, and proceed to step 6; Step 6: Set the system frequency f according to the signal transmission rate and interference suppression requirements of the slip ring wireless power and signal synchronization transmission system. d Set voltage source U dt1 Voltage source U dt2 ; Step 7: Set the size and number of turns of the primary and secondary signal coils according to the installation space of the slip ring wireless power and signal synchronization transmission system; Step 8, calculate primary signal coil self-inductance L ds , secondary signal coil self-inductance L dp , primary signal and secondary signal coil mutual inductance M ps ; Step 9: Based on the system frequency f d , Primary signal coil self-inductance L ds Secondary signal coil self-inductance L dp And the mutual inductance M between the primary and secondary signal coils ps Calculate the series compensation capacitor C dt1 C dr1 and parallel compensation capacitor C dt2 C dr2 ; Step 10: Based on the self-inductance L of the primary signal coil ds Mutual inductance M between primary and secondary signal coils ps Calculate the gain G of the signal in the forward direction. d1 According to the self-inductance L of the secondary signal coil dp Mutual inductance M between primary and secondary signal coils ps Calculate the gain G of the signal in reverse propagation. d2 According to voltage source U dt1 , self-inductance L of the primary signal coil ds Mutual inductance M between primary and secondary signal coils ps Calculate the signal-to-noise ratio (SNR) 1 for the forward transmission of the signal; based on the voltage source U dt2 Secondary signal coil self-inductance L dp Mutual inductance M between primary and secondary signal coils ps Calculate the signal-to-noise ratio (SNR)² of the signal transmitted in the reverse direction. Step 11, judging whether SNR1≥15dB, SNR2≥15dB, G d1 ≥0dB, G d2 ≥0dB are satisfied; if not, modifying the turns of the primary signal coil and the secondary signal coil, and returning to step 9; otherwise, the parameters of the signal transmission channel of the slip ring wireless power and signal synchronous transmission system are obtained.

9. The parametric design method of claim 8, wherein, include: Computing the series compensation capacitance C P comprising: ; wherein ω p is the system operating angular frequency.

10. The parametric design method of claim 8, wherein, include: Calculate the series compensation capacitor C dt1 C dr1 Includes: solving equations The series compensation capacitor C is obtained. dt1 C dr1 .

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