Synchronous motor excitation system based on wireless electric energy transmission for aero-engine

Abstract

The invention relates to a wireless power transmission-based synchronous motor excitation system for an aero-engine, which belongs to the technical field of wireless power transmission synchronous motor excitation, and comprises a power supply, an inversion module, a metal eddy current resonance compensation network, a passive rectification module and an excitation module, on one hand, a synchronous motor excitation system suitable for wireless electric energy transmission of an engine rotating part is designed and arranged in an aero-engine, power transmission from a power source to a load can be completed without physical connection, the reliability problem of friction of a contact structure is solved, and the structure is simple; on the other hand, a metal eddy current resonance compensation network is introduced into a coupling mechanism of a transmitting end coil and a receiving end coil for wireless electric energy transmission, so that the excitation system of the synchronous motor is in a resonance state, and the compensation inductance and capacitance of the aero-engine under the consideration of the metal eddy current influence can be obtained; and resonance compensation under the influence of the metal eddy current is further realized.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless power transmission synchronous motor excitation, and in particular to a synchronous motor excitation system based on wireless power transmission for aircraft engines. Background Art

[0002] The design of arranging the motor inside the aircraft engine has many advantages as mentioned above, but the actual application faces a series of difficulties. On the one hand, the temperature inside the engine is high, and the permanent magnet synchronous motor faces the defect of demagnetization failure, so an electric excitation solution must be used instead. Realizing rotational energy transfer is a prerequisite for the operation of the electric excitation synchronous motor. According to the excitation principle, electrical energy needs to be transmitted from an external static power source to the internal high-speed rotating motor rotor to establish the rotor's excitation magnetic field. On the other hand, since the traditional method relies on the contact energy transfer solution of the brush-slip ring, the structure is complex and the contact friction leads to poor reliability. In addition, the motor is located inside the engine, the structure is compact, and the space utilization ratio is required to be high.

[0003] In the prior art, the internal structure of aircraft engines is compact and the gap is small. The coupling coils arranged on the rotor and stator are close to each other and the air gap is small. The coupling degree of the transmitting and receiving coils is tight and the coupling coefficient is large. When the wireless energy transmission excitation system is inside the aircraft engine, due to its special metal environment, the metal medium causes the working conditions of the system to be significantly different from the open and disturbed air environment of the general system. In terms of conductivity, the conductivity of the engine metal can reach 10 5 S / m or above (taking steel as an example), while the conductivity of air is 0. Therefore, in addition to conductors such as coupling coils, the engine metal should also be considered as a conductor in the wireless energy transmission system. At the same time, the presence of a conductor medium in the wireless energy transmission path will interfere with the system parameters and affect the system's working characteristics.

[0004] In the prior art, the mechanism of action of the coupling mechanism between the metal parts of the engine and the wireless energy transmission system includes two aspects: 1. Similar to the primary and secondary coils, the engine is also a ring-shaped rotating body in terms of spatial structure. The magnetic field passing through the cross section on the transmission path will induce eddy current. Metal materials have a certain resistance, and eddy current generates active loss in the form of heat, namely eddy current loss;

[0005] ② The eddy current will generate an induced magnetic field, which is opposite to the magnetic field generated by the primary and secondary coils of the system itself, and couples with the original magnetic field, causing the coupled magnetic field to change, partially offsetting the effect of the original magnetic field. The magnetic effect generated by the current in the metal of this part of the engine is similar to the effect of the inductor coil. The superposition of the two effects will cause the metal conductor of the engine to exhibit resistance-inductance characteristics. Summary of the invention

[0006] In view of the above problems, the present invention provides a synchronous motor excitation system based on wireless power transmission for aircraft engines and a method of use, including a power supply, an inverter module, a metal eddy current resonance compensation network, a passive rectifier module and an excitation module. On the one hand, the present invention designs a synchronous motor excitation system suitable for wireless power transmission of rotating parts of aircraft metal engines, which is arranged inside the aircraft metal engine, and realizes power transmission from power supply to load without physical connection, fundamentally overcoming the reliability problem of contact structure friction, with a simple structure, and overcoming the compact space limitation inside the engine; on the other hand, the synchronous motor excitation system based on wireless power transmission of the present invention introduces a metal eddy current resonance compensation network in the coupling mechanism of the transmitting end coil and the receiving end coil of the wireless power transmission, so that the synchronous motor excitation system is in a resonant state, and can obtain the compensation inductance and capacitance of the aircraft engine under the influence of metal eddy current, further realize the resonance compensation under the influence of metal eddy current, and improve the efficiency of wireless power transmission from the transmitting side to the receiving side.

[0007] The present invention provides a synchronous motor excitation system for wireless power transmission of an aircraft engine, characterized in that it comprises:

[0008] Power supply, inverter module, metal eddy current resonance compensation network, passive rectifier module and excitation module;

[0009] The inverter module is respectively connected to a power supply and a metal eddy current resonance compensation network, and the passive rectification module is respectively connected to the metal eddy current resonance compensation network and an excitation module.

[0010] The power supply is a DC power supply;

[0011] Optionally, the inverter module is a full-bridge inverter module, used to receive direct current from a direct current power supply;

[0012] By precisely controlling the on and off of multiple switch tubes, the direct current transmission direction can be quickly switched.

[0013] According to the conduction sequence of each switch tube, a high-frequency AC signal required by the metal eddy current resonance compensation network is generated;

[0014] The high frequency AC signal is used as the AC power of the synchronous motor excitation system of wireless power transmission.

[0015] The metal eddy current resonance compensation network is used to obtain the compensation inductance and compensation capacitance of the aircraft engine under the influence of the metal eddy current, and further realize the resonance compensation under the influence of the metal eddy current.

[0016] Optionally, the inverter module includes: a MOS switch tube 1 Q1, a MOS switch tube 2 Q2, a MOS switch tube 3 Q3 and a MOS switch tube 4 Q4;

[0017] The MOS switch tube three Q3 is respectively connected to the positive electrode of the power supply, the MOS switch tube four Q4, the metal eddy current resonance compensation network and the MOS switch tube one Q1;

[0018] The MOS switch tube 1 Q1 is also connected to a DC power supply and a MOS switch tube 2 Q2;

[0019] The MOS switch tube 2 Q2 is also connected to a metal eddy current resonance compensation network and a MOS switch tube 4 Q4.

[0020] Optionally, the metal eddy current resonance compensation network includes a T circuit, an R circuit and an E circuit;

[0021] The E circuit is arranged between the T circuit and the R circuit;

[0022] The T circuit is a transmitter circuit, including a transmitter coil; the R circuit is a receiver circuit, including a receiver coil;

[0023] The E circuit is a metal eddy current equivalent circuit;

[0024] It can be understood that the metal eddy current is a circular current generated inside the metal parts of the engine due to electromagnetic induction when the metal parts of the engine are placed in an alternating magnetic field;

[0025] It can be understood that the alternating current generates an alternating magnetic field through the transmitting coil and the receiving coil;

[0026] Furthermore, the T circuit includes an inductor L f1 , capacitor C f1 、Inductance L p and capacitor C p ;

[0027] The inductance L f1 One end is connected to the inverter module, and the other end is connected to the capacitor C f1 and capacitor C p One end of the capacitor C p The other end of the inductor L p one end of

[0028] Optionally, the R circuit includes an inductor L s and capacitor C s ;

[0029] The inductance L p The other end is connected to the inverter module and capacitor C f1 ;

[0030] The inductance L s and capacitor C s are connected to the passive rectifier modules respectively; the capacitor C s Connection inductance L s .

[0031] Optionally, the R circuit generates mutual inductance with the T circuit and the E circuit respectively.

[0032] Another object of the present invention is to provide a method for performing resonance compensation on a synchronous motor excitation system based on wireless power transmission, comprising:

[0033] Step S1, obtaining relevant design index values;

[0034] Step S2, let a=1, when a=1, it indicates the first iteration step;

[0035] Step S3: Obtain the corresponding coupling mechanism inductance matrix B based on the design index value a ;

[0036] Step S4: Through the coupling mechanism inductance matrix B a Get the current parameters of the R circuit receiving end coil in the synchronous motor excitation system of wireless power transmission

[0037] Step S5: Current parameters of the receiving coil based on the R circuit Determine the right arm impedance and right arm reactance of the T circuit;

[0038] Step S6: Based on the constraints of Kirchhoff's voltage law KVL voltage equation, obtain the real part K of the circuit equation R l,a , R circuit equation imaginary part K j,a and the real part M of the circuit equation E l,a and the imaginary part M of the circuit equation E j,a ;

[0039] Step S7, setting the total impedance of the R circuit in a resonant state;

[0040] Step S8: Based on the real part K of the R circuit equation l,a , R is the total impedance of the circuit in the resonant state, E is the real part of the circuit equation M l,a The imaginary part M of the equation of the circuit E j,a , obtain the ath preset proportional coefficient between the T circuit transmitting end coil and the R circuit receiving end coil;

[0041] Step S9, substitute the ath proportional coefficient of the T circuit transmitting end coil and the R circuit receiving end coil into the imaginary part K of the R circuit equation in step S8 j,a , get the compensation capacitance C of the R circuits,a ;

[0042] Step S10: Based on the coil current at the receiving end of the R circuit and the reactance Z of the right bridge arm of the T circuit p,a And the compensation capacitor C of the R circuit s,a Get the compensation capacitance C of the T circuit p,a ;

[0043] Step S11, determining the T circuit compensation capacitor C p,a Is it greater than 0? If so, calculate the compensation capacitance C of the T circuit f1,a and T circuit compensation inductor L f1,a ; If not, it means that the inductance is not compensated;

[0044] Step S12, determine whether a is greater than or equal to A, where A represents the total number of iteration steps. If so, complete the resonance compensation of the synchronous motor excitation system based on wireless power transmission. If not, set a=a+1 and return to step S3.

[0045] Optionally, the current parameter of the coil at the receiving end of the R circuit in step S5 is The specific steps to determine the right arm impedance and right arm reactance of the T circuit include:

[0046] Current parameters of the receiving coil based on the R circuit Setting the ath preset proportionality coefficient between the T circuit transmitting end coil and the R circuit receiving end coil;

[0047] Based on the ath preset proportional coefficient of the T circuit transmitting end coil and the R circuit receiving end coil, the current parameters of the T circuit transmitting end coil are obtained respectively. and the current parameters of the E circuit

[0048] Current parameters of receiving coil based on R circuit Current parameters of the T circuit transmitting coil and the current parameters of the E circuit Determine the right arm impedance and right arm reactance of the T circuit.

[0049] Compared with the prior art, the present invention has at least the following beneficial effects:

[0050] (1) The synchronous motor excitation system based on wireless power transmission of the present invention introduces a metal eddy current resonance compensation network to compensate for the reactive power generated by the coil winding in the coupling mechanism composed of the transmitting coil and the receiving coil in the wireless power transmission, so that the synchronous motor excitation system is in a resonant state, thereby improving the efficiency from the transmitting coil to the receiving coil;

[0051] (2) The present invention establishes a synchronous motor excitation system for wireless energy transmission that is suitable for the internal metal environment of the engine and takes into account the influence of metal eddy currents. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The drawings are only for the purpose of illustrating particular embodiments and are not to be construed as limiting the invention.

[0053] Figure 1 A schematic diagram of a circuit topology diagram of a wireless power transmission synchronous motor excitation system for an aircraft engine in an embodiment of the present invention;

[0054] Figure 2 Schematic diagram of a T circuit decoupling model in an embodiment of the present invention;

[0055] Figure 3 Schematic diagram of an R circuit decoupling model in an embodiment of the present invention;

[0056] Figure 4 Schematic diagram of the E circuit decoupling model in an embodiment of the present invention;

[0057] Figure 5 It is a schematic diagram of a flow chart of a method for performing resonance compensation on a synchronous motor excitation system based on wireless power transmission in an embodiment of the present invention.

[0058] Reference numerals:

[0059] Q1 is MOS switch tube 1, Q2 is MOS switch tube 2, Q3 is MOS switch tube 3, Q4 is MOS switch tube 4, D1 is the first diode, D2 is the second diode, D3 is the third diode, and D4 is the fourth diode DETAILED DESCRIPTION

[0060] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments can be combined with each other. In addition, the present invention can also be implemented in other ways different from those described herein, and therefore, the protection scope of the present invention is not limited by the specific embodiments disclosed below.

[0061] A specific embodiment of the present invention, as Figure 1-5 , discloses a wireless energy transmission synchronous motor excitation system for aircraft engines, and the specific implementation steps are as follows:

[0062] Including: power supply, inverter module, metal eddy current resonance compensation network, passive rectification module and excitation module;

[0063] The metal eddy current resonance compensation network is a resonance compensation network that takes into account the influence of metal eddy current;

[0064] Optionally, the inverter module is respectively connected to a power supply and a metal eddy current resonance compensation network, and the passive rectifier module is respectively connected to the metal eddy current resonance compensation network and an excitation module;

[0065] Optionally, the power supply is a DC power supply, used to provide DC power to the wireless energy transmission synchronous motor excitation system.

[0066] Optionally, the inverter module is a full-bridge inverter module, used to receive direct current from a direct current power supply;

[0067] By controlling the on and off of multiple switch tubes, the direct current transmission direction can be quickly switched;

[0068] According to the conduction sequence of each switch tube, a high-frequency AC signal required by the metal eddy current resonance compensation network is generated;

[0069] The high frequency AC signal is used as the AC power of the synchronous motor excitation system of wireless power transmission.

[0070] The passive rectification module is used to convert the received alternating current into direct current, reduce the fluctuations generated during the rectification process, and provide a stable direct current power supply.

[0071] The excitation module is used to generate an excitation current to establish a stable magnetic field inside the rotor.

[0072] Optionally, the inverter module includes: a MOS switch tube 1 Q1, a MOS switch tube 2 Q2, a MOS switch tube 3 Q3 and a MOS switch tube 4 Q4;

[0073] It can be understood that the MOS switch tube is a metal-oxide-semiconductor field effect transistor;

[0074] Further, one end of the MOS switch tube Q3 is respectively connected to the positive electrode of the power supply and one end of the MOS switch tube Q4, and the other end of the MOS switch tube Q3 is respectively connected to the metal eddy current resonance compensation network and one end of the MOS switch tube Q1;

[0075] The other end of the MOS switch tube Q1 is connected to the negative electrode of the power supply and one end of the MOS switch tube Q2 respectively;

[0076] The other end of the MOS switch tube Q2 is respectively connected to the metal eddy current resonance compensation network and one end of the MOS switch tube Q4;

[0077] Optionally, the passive rectifier module includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4 and a capacitor C o ;

[0078] One end of the first diode D1 is connected to the metal eddy current resonance compensation network and one end of the third diode D3 respectively, and the other end is connected to one end of the second diode D2;

[0079] The capacitor C o One end is respectively connected to the second diode D2 and the excitation module, and the other end is respectively connected to the excitation module and the metal eddy current resonance compensation network;

[0080] One end of the fourth diode D4 is respectively connected to the excitation module, the metal eddy current resonance compensation network and the other end of the third diode D3, and the other end is connected to the second diode D2;

[0081] Optionally, the excitation module includes a resistor R l ;

[0082] The resistor R l The positive electrode and resistor R l The negative poles of the capacitors C o ;

[0083] Optionally, the metal eddy current resonance compensation network includes a T circuit, an R circuit and an E circuit;

[0084] The E circuit is arranged between the T circuit and the R circuit;

[0085] The T circuit is a transmitter circuit, including a transmitter coil; the R circuit is a receiver circuit, including a receiver coil;

[0086] The E circuit is a metal eddy current equivalent circuit of the engine;

[0087] It can be understood that the metal eddy current is a circular current generated inside the metal parts of the engine due to electromagnetic induction when the metal parts of the engine are placed in an alternating magnetic field;

[0088] It can be understood that the alternating current generates an alternating magnetic field through the transmitting coil and the receiving coil;

[0089] Optionally, the T circuit is used to convert direct current into high-frequency alternating current, is responsible for the generation and emission of electric energy, and transmits the electric energy in the form of an alternating electromagnetic field to the receiving end coil through the metal eddy current resonance compensation network and the transmitting end coil;

[0090] The R circuit is used to capture the alternating electromagnetic field generated by the transmitting coil, perform demodulation, rectification and filtering, and provide a stable DC power supply for the load;

[0091] The E circuit is an auxiliary circuit, which serves as an engine metal eddy current equivalent circuit and is used to optimize the distribution of alternating electromagnetic fields, reduce parasitic parameters, suppress electromagnetic interference, and improve the efficiency and stability of the synchronous motor excitation system of wireless power transmission.

[0092] Optionally, the T circuit includes an inductor L f1 , capacitor C f1 、Inductance L p and capacitor C p ;

[0093] The R circuit includes an inductor L s and capacitor C s ;

[0094] The E circuit includes a resistor R m and inductor L m ;

[0095] The inductance L f1 One end is connected to the inverter module, and the other end is connected to the capacitor C f1 and capacitor C p One end of the capacitor C p The other end of the inductor L p one end of

[0096] The inductance L p The other end is connected to the inverter module and capacitor C f1 ;

[0097] The inductance L s and capacitor C s are connected to the passive rectifier modules respectively; the capacitor C s Connection inductance L s ;

[0098] The resistor R m Connection inductance L m ;

[0099] Optionally, the R circuit generates mutual inductance with the T circuit and the E circuit respectively;

[0100] Optionally, the other end of the MOS switch tube Q3 is connected to an inductor L f1 ;

[0101] The other end of the MOS switch tube Q2 is connected to the capacitor C f1 ;

[0102] Optionally, one end of the first diode D1 is connected to an inductor L s ;

[0103] Optionally, the capacitor C o One end of the resistor Rl The negative electrode and capacitor C s , the other end resistor R l The positive electrode;

[0104] It can be understood that the inductance L f1 is the compensation inductance of the resonant compensation network of the T circuit, the capacitor C f1 is the compensation capacitor of the resonant compensation network of the T circuit, the inductor L p is the self-inductance of the T circuit coupling mechanism coil, the inductance L s R is the self-inductance of the circuit coupling mechanism coil, the capacitance C p is the resonant capacitance of the corresponding T circuit, the capacitance C s is the resonant capacitance of the corresponding R circuit;

[0105] It can be understood that the coupling mechanism includes a transmitting end coil of a T circuit and a receiving end coil of an R circuit;

[0106] In the present invention, the metal eddy current equivalent circuit of the engine in the E circuit is coupled with the receiving end coil of the R circuit and the transmitting end coil of the T circuit respectively, which is characterized by the mutual inductance L of the receiving end coil of the R circuit and the transmitting end coil of the T circuit. ps The mutual inductance L ps Including the mutual inductance L of the transmitting coil in the T circuit and the engine metal eddy current equivalent circuit in the E circuit pm And the mutual inductance L between the receiving coil in the R circuit and the engine metal eddy current equivalent circuit in the E circuit sm ;

[0107] It can be understood that the wireless energy transmission synchronous motor excitation system for aircraft engines in the present invention combines radio transmission with the excitation system of the synchronous motor, wherein the transmitting end coil and the receiving end coil in the radio transmission correspond to the stator and the rotor of the synchronous motor respectively;

[0108] The present invention uses the mutual inductance L of the receiving end coil of the R circuit and the transmitting end coil of the T circuit. ps , the mutual inductance L between the transmitting coil in the T circuit and the engine metal eddy current equivalent circuit in the E circuit pm And the mutual inductance L between the receiving coil in the R circuit and the engine metal eddy current equivalent circuit in the E circuit sm The influence of metal eddy current on the resonant state of the synchronous excitation system of the present invention is obtained; the resonant compensation network based on the influence of metal eddy current is dynamically adjusted according to different metal eddy current intensities to obtain the adjusted inductance C f1 , capacitor C f1 , capacitor C s and capacitor C p Four compensation parameters make the synchronous excitation system considering the influence of metal eddy current in a resonant state.

[0109] It can be understood that the capacitor C o It is a filter capacitor connected in parallel with the passive rectifier bridge. After passing through the passive rectifier module, the AC power is rectified and filtered into DC power, and then output to the excitation module to generate excitation current to establish a stable magnetic field inside the rotor.

[0110] Another object of the present invention is to provide a method for resonant compensation of a synchronous motor excitation system based on wireless power transmission, in particular, the method for resonant compensation of a synchronous motor excitation system based on wireless power transmission considering the influence of metal eddy currents, comprising:

[0111] Step S1, obtaining relevant design indicators and indicator values; the design indicators include inductance and resistance;

[0112] For example, Figure 1 , the indicators include inductance L s , resistor R m , DC load R load , output power P out , DC input voltage U dc ;

[0113] It can be understood that in each iteration step, the inductance L s , resistor R m , DC load R load , output power P out , DC input voltage U dc Are all different.

[0114] Step S2, let a=1, when a=1, it indicates the first iteration step;

[0115] Step S3: Obtain the corresponding coupling mechanism inductance matrix B based on the design index value a ;

[0116] Step S4: Through the coupling mechanism inductance matrix B a Get the current parameters of the R circuit receiving end coil in the synchronous motor excitation system of wireless power transmission

[0117] Step S5: Current parameters of the receiving coil based on the R circuit Setting the ath preset proportionality coefficient between the T circuit transmitting end coil and the R circuit receiving end coil;

[0118] Based on the ath preset proportional coefficient of the T circuit transmitting end coil and the R circuit receiving end coil, the current parameters of the T circuit transmitting end coil are obtained respectively. Current parameters of the engine metal eddy current equivalent circuit in the E circuit

[0119] Optionally, the R circuit receiving end coil current parameter Where I2 represents the current amplitude of the coil at the receiving end of the R circuit;

[0120] Optionally, obtain the current parameter of the receiving end coil of the R circuit The specific steps include:

[0121] Based on the output power P out and DC electronic load R Load Get the current parameters of the receiving coil of the R circuit

[0122] Furthermore, the output power P out The expression is:

[0123]

[0124] in, For DC load R Load Equivalent load converted to the front side of the rectifier, R Load For DC load.

[0125] Optionally, the unknown proportionality coefficients of the T circuit transmitting end coil and the R circuit receiving end coil include: a resistance proportionality coefficient and a reactance proportionality coefficient of the T circuit transmitting end coil and the R circuit receiving end coil;

[0126] Optionally, the expression of the proportionality coefficient of the T circuit transmitting end coil and the R circuit receiving end coil is:

[0127]

[0128] The expression of the proportionality coefficient of the E circuit metal part and the R circuit receiving coil is:

[0129]

[0130] in, The current parameters of the transmitting coil of the T circuit are: is the current parameter of the coil at the receiving end of the R circuit, is the current parameter of the engine metal eddy current equivalent circuit in circuit E;

[0131] It represents the proportionality coefficient between the transmitting coil of the T circuit and the receiving coil of the R circuit. Represents the proportionality coefficient between the metal parts of the E circuit and the receiving coil of the R circuit, R 12 is the resistance ratio coefficient between the transmitting coil of the T circuit and the receiving coil of the R circuit, R 32 is the resistance ratio coefficient of the engine metal eddy current equivalent circuit of the E circuit and the receiving coil of the R circuit, X12 is the reactance proportionality coefficient between the transmitting coil of the T circuit and the receiving coil of the R circuit, j is an imaginary unit, X 32 It is the proportional coefficient of the reactance of the engine metal eddy current equivalent circuit of the E circuit and the receiving coil of the R circuit.

[0132] It is understood that the engine metal parts include the engine metal casing;

[0133] Optionally, obtain the current parameter of the T circuit transmitting end coil Current parameters of the engine metal eddy current equivalent circuit of the E circuit The specific steps include:

[0134] The current gain constraint is set based on the current parameters of the transmitting coil of the T circuit. The expression is:

[0135]

[0136] Among them, G i is the current gain constraint, U in is the derivative of the voltage fundamental amplitude, U dc is the DC input voltage, and X is the bridge arm reactance value of the T circuit.

[0137] Exemplarily, the T circuit is a symmetrical T-type circuit, such as Figure 2 As shown;

[0138] The symmetrical T-type circuit comprises a right bridge arm, a left bridge arm and a lower bridge arm;

[0139] Step S6: Current parameters of the receiving coil based on the R circuit Current parameters of the T circuit transmitting coil and the current parameters of the E circuit Determine the impedance of the right bridge arm of the T circuit, the expression is:

[0140]

[0141] Where ω is the angular frequency, Z P is the impedance of the right bridge arm of the T circuit.

[0142] Optionally, the specific step of determining the impedance of the right bridge arm of the T circuit in step S6 includes:

[0143] Based on the current parameters of the transmitting coil of the R circuit and the inductance L of the T circuit p , capacitor C p , the current parameters of the R circuit receiving coil, the mutual inductance L of the R circuit receiving coil and the T circuit transmitting coil ps, the mutual inductance L of the eddy current between the transmitting coil of the T circuit and the equivalent engine ring metal structure in the E circuit pm The right bridge arm impedance of the T circuit is obtained by using the current parameters of the equivalent engine ring metal structure in the E circuit.

[0144] Step S7: Based on the symmetry of the T circuit, determine the right bridge arm reactance, the total left bridge arm reactance, and the total lower bridge arm reactance of the T circuit, and the expressions are:

[0145]

[0146] ωL f1 =X'

[0147]

[0148] Where X is the reactance of the right bridge arm of the T circuit, X' is the reactance of the left bridge arm of the T circuit, and X" is the reactance of the lower bridge arm of the T circuit. The reactance values ​​of each bridge arm are the same; ω is the angular frequency; L ps is the mutual inductance of the receiving coil in the R circuit and the transmitting coil in the T circuit; L pm is the mutual inductance of the transmitting coil in the T circuit and the metal eddy current equivalent circuit of the engine in the E circuit;

[0149] Step S8: Based on the voltage equation constraint condition of Kirchhoff's voltage law KVL, obtain the circuit equation L of R a , the expression is:

[0150]

[0151] Step S9: Replace the circuit equation L a The real and imaginary parts of R are separated to obtain the separated R circuit equation K a , the expression is:

[0152]

[0153] Optionally, in step S8, the circuit equation L of R is obtained: a The specific steps include:

[0154] Based on the constraints of Kirchhoff's voltage law KVL voltage equation, the current parameters of the transmitting coil of the R circuit, and the inductance L s , capacitor C s , the mutual inductance L of the receiving coil of the R circuit and the transmitting coil of the T circuit ps , the mutual inductance L between the receiving coil of the R circuit and the metal eddy current of the E circuit sm And the current parameters of the equivalent engine ring metal structure in the E circuit are used to obtain the R circuit equation.

[0155] Step S10: The separated R circuit equation Ka Converted into algebraic expressions, we can get the real part K of the circuit equation R l,a and R circuit equation - imaginary part K j,a The expressions are:

[0156]

[0157] Based on the real part K of the circuit equation R l,a and R circuit equation imaginary part K j,a , get the total impedance Z of the R circuit s,a , the expression is:

[0158]

[0159] Step S11, setting the total impedance of the R circuit in a resonant state;

[0160] The expression is:

[0161] ωL ps R 12 +ωL sm R 32 =0

[0162] It can be understood that the resonant state is when the circuit is purely resistive, and the effects of inductance and capacitance cancel each other out, that is, the imaginary part of the total impedance expression of the R circuit is 0;

[0163] Step S12: Kirchhoff's voltage law KVL voltage equation constraint M based on the E circuit a , we get the circuit equation of E, which is expressed as:

[0164]

[0165] Separate the real and imaginary parts of the E circuit equation to obtain the separated E circuit equation M a , the expression is:

[0166] R 32 R metal I2-ωL m X 32 I2-ωL pm X 12 I2+j(R metal X 32 I2+ωL m R 32 I2+ωL zm I2+ωL pm R 12 I2)=0

[0167] Optionally, the specific steps of obtaining the E circuit equation in step S12 include:

[0168] Based on the constraints of the KVL voltage equation of the E circuit, the current parameters of the T circuit transmitting coil, and the mutual inductance L of the eddy current between the T circuit transmitting coil and the equivalent engine annular metal structure in the E circuit pm , the current parameters of the R circuit receiving coil, the mutual inductance L between the R circuit receiving coil and the E circuit metal eddy current sm , E circuit equivalent engine ring metal structure current parameter resistance R m and inductor L m , get the E circuit equation; such as Figure 4 shown.

[0169] Step S13: The separated E circuit equation M a Perform algebraic transformation to obtain the real part M of the circuit equation E l，a and the imaginary part M of the circuit equation E j，a , the expressions are:

[0170] R32R metal -ωL m X 32 -ωL pm X 12 =0

[0171] R metal X 32 +ωL m R 32 +ωL sm +ωL pm R 12 =0

[0172] Step S14: Based on the real part K of the R circuit equation l，a , R is the total impedance of the circuit in the resonant state, E is the real part of the circuit equation M l，a The imaginary part M of the equation of the circuit E j,a , get the ath proportionality coefficient between the transmitting coil of the T circuit and the receiving coil of the R circuit;

[0173] Step S15, substitute the ath proportional coefficient of the T circuit transmitting end coil and the R circuit receiving end coil into the imaginary part K of the R circuit equation in step S8 j，a , get the compensation capacitance C of the R circuit s，a ;

[0174] Step S16: Based on the R circuit receiving end coil current, the T circuit transmitting end coil current, and the T circuit right bridge arm reactance Z p,a And the compensation capacitor C of the R circuit s,a Get the compensation capacitance C of the T circuit p,a ;

[0175] Step S17: Determine the T circuit compensation capacitor Cp,a Is it greater than 0? If so, calculate the compensation capacitance C of the T circuit f1,a and T circuit compensation inductor L f1,a , go to the next step; if not, it means that the inductance is not compensated,

[0176] Step S18, determine whether a is greater than or equal to A, where A represents the total number of iteration steps. If so, complete the resonance compensation of the synchronous motor excitation system based on wireless power transmission. If not, set a=a+1 and return to step S3.

[0177] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A wireless energy transmission synchronous motor excitation system for aircraft engines, characterized in that: include: Power supply, inverter module, metal eddy current resonance compensation network, passive rectifier module and excitation module; The inverter module is respectively connected to the power supply and the metal eddy current resonance compensation network, and the passive rectifier module is respectively connected to the metal eddy current resonance compensation network and the excitation module; The metal eddy current resonance compensation network is used to obtain the compensation inductance and compensation capacitance of the aircraft engine under the influence of the metal eddy current, and further realize the resonance compensation under the influence of the metal eddy current; The metal eddy current resonance compensation network includes: a T circuit, an R circuit and an E circuit; The E circuit is provided between the T circuit and the R circuit.

2. The wireless energy transmission synchronous motor excitation system for aircraft engines according to claim 1 is characterized in that: The inverter module is a full-bridge inverter module, which converts the DC power provided by the DC power supply into an AC power signal suitable for the metal eddy current resonance compensation network as the AC power of the system operating frequency by controlling the turning off and on of multiple switch tubes.

3. The wireless energy transmission synchronous motor excitation system for aircraft engines according to claim 1 is characterized in that: The inverter module includes: a MOS switch tube 1 Q1, a MOS switch tube 2 Q2, a MOS switch tube 3 Q3 and a MOS switch tube 4 Q4; The MOS switch tube three Q3 is respectively connected to the power supply, the MOS switch tube four Q4, the metal eddy current resonance compensation network and the MOS switch tube one Q1; The MOS switch tube 1 Q1 is also connected to a power source and a MOS switch tube 2 Q2; The MOS switch tube 2 Q2 is also connected to a metal eddy current resonance compensation network and a MOS switch tube 4 Q4.

4. The wireless energy transmission synchronous motor excitation system for aircraft engines according to claim 1, characterized in that: The T circuit includes an inductor L f1 , capacitor C f1 、Inductance L p and capacitor C p ; The inductance L f1 One end is connected to the inverter module, and the other end is connected to the capacitor C f1 and capacitor C p One end of the capacitor C p The other end of the inductor L p one end.

5. The wireless energy transmission synchronous motor excitation system for aircraft engines according to claim 4 is characterized in that: The metal eddy current resonance compensation network includes: the R circuit includes an inductor L s and capacitor C s ; The inductance L p The other end is connected to the inverter module and capacitor C f1 ; The inductance L s and capacitor C s are connected to the passive rectifier modules respectively; the capacitor C s Connection inductance L s .

6. The wireless energy transmission synchronous motor excitation system for aircraft engines according to claim 1, characterized in that: The E circuit includes a resistor R m and inductor L m ; The resistor R m Connection inductance L m .

7. A method for resonance compensation of a synchronous motor excitation system for wireless power transmission of an aircraft engine according to any one of claims 1 to 6, characterized in that: Step S1, obtaining relevant design index values; Step S2, let a=1, when a=1, it indicates the first iteration step; Step S3: Obtain the corresponding coupling mechanism inductance matrix B based on the design index value a ; Step S4: Through the coupling mechanism inductance matrix B a Get the current parameters of the R circuit receiving end coil in the synchronous motor excitation system of wireless power transmission Step S5: Current parameters of the receiving coil based on the R circuit Determine the right arm impedance and right arm reactance of the T circuit; Step S6: Based on the constraints of Kirchhoff's voltage law KVL voltage equation, obtain the real part K of the circuit equation R l,a , R circuit equation imaginary part K j,a and the real part M of the circuit equation E l,a and the imaginary part M of the circuit equation E j,a ; Step S7, setting the total impedance of the R circuit in a resonant state; Step S8: Based on the real part K of the R circuit equation l,a , R is the total impedance of the circuit in the resonant state, E is the real part of the circuit equation M l,a The imaginary part M of the equation of the circuit E j,a , get the ath proportionality coefficient between the transmitting coil of the T circuit and the receiving coil of the R circuit; Step S9, substitute the ath proportional coefficient of the T circuit transmitting end coil and the R circuit receiving end coil into the imaginary part K of the R circuit equation in step S8 j,a , get the compensation capacitance C of the R circuit s,a ; Step S10: Based on the coil current at the receiving end of the R circuit and the reactance Z of the right bridge arm of the T circuit p,a And the compensation capacitor C of the R circuit s,a Get the compensation capacitance C of the T circuit p,a ; Step S11, determining the T circuit compensation capacitor C p,a Is it greater than 0? If so, calculate the T circuit compensation capacitance C f1,a and T circuit compensation inductor L f1,a ; If not, it means that the inductance is not compensated; Step S12, determine whether a is greater than or equal to A, where A represents the total number of iteration steps. If so, complete the resonance compensation of the synchronous motor excitation system based on wireless power transmission. If not, set a=a+1 and return to step S3.

8. The wireless energy transmission synchronous motor excitation system for aircraft engines according to claim 8, characterized in that: Step S5 is based on the current parameter of the R circuit receiving end coil The specific steps to determine the right arm impedance and right arm reactance of the T circuit include: Current parameters of the receiving coil based on the R circuit Setting the ath preset proportionality coefficient between the T circuit transmitting end coil and the R circuit receiving end coil; Based on the ath preset proportional coefficient of the T circuit transmitting end coil and the R circuit receiving end coil, the current parameters of the T circuit transmitting end coil are obtained respectively. and the current parameters of the E circuit Current parameters of receiving coil based on R circuit Current parameters of the T circuit transmitting coil and the current parameters of the E circuit Determine the right arm impedance and right arm reactance of the T circuit.

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