A C-type core combined rotary loose coupling transformer

Abstract

The application discloses a C-shaped iron core combined rotary loose coupling transformer, which comprises a fixed assembly and a rotary assembly. The fixed assembly comprises a fixed iron core, first and second fixed windings and a fixed side circuit; the longitudinal section of the fixed iron core is in the shape of a C letter, and the fixed iron core comprises a first fixed iron core, a second fixed iron core and a third fixed iron core; the rotary assembly comprises a rotary magnetic core, a rotary shaft, a rotary bearing, a rotary clamping groove, first and second radial rotary rings, first and second rotary windings and a rotating side circuit; the fixed iron core surrounds the outer periphery of the rotary shaft in the radial direction, and the fixed iron core and the rotary shaft are fixed by the rotary bearing; the first fixed winding and the second fixed winding are connected in series, and the first rotary winding and the second rotary winding are also connected in series. The C-shaped iron core combined rotary loose coupling transformer designed by the application reduces the axial size and weight, improves the power transmission capacity, and first connects the rotating side circuit with a matrix converter.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electrically excited magnetic, in particular to a C-type core combined rotating loosely coupled transformer. BACKGROUND

[0002] With the development of power electronics technology, the transformer as an indispensable part of the power system, its position has become more and more important. For the traditional transformer, the rotor excitation needs slip ring and brush system. In the daily work, they are always rotating at high speed, with mechanical friction wear producing fine dust particles. These will affect the performance of the cooling motor transmission oil, motor insulation and increase the rotating resistance, and will intensify with the increase of the running speed of the traction motor, directly affecting the service life of the slip ring and brush. When the power or voltage is too large, this mechanical wear will cause poor contact of the system, and even cause ring fire, burn the motor excitation system. At the same time, the brush often causes strong high-frequency electromagnetic interference in the process of work, which worsens the electromagnetic environment of the click system, which increases the risk of failure and safety hazard. A rotating transformer applied to a non-contact power transmission system emerges as the times require.

[0003] This rotating transformer allows non-contact power transmission to the rotating parts of the system, avoiding the reliability problems of slip ring and brush, increasing the stability of the system, and making the energy transmission system more secure. Loosely coupled transformer is a key part of the non-contact power transmission system, and the magnetic core material, winding position, air gap size and other factors directly affect the coupling coefficient. In general, the main structures at present are tank type loosely coupled transformer, nested loosely coupled transformer and up-down separated loosely coupled transformer. The tank type loosely coupled transformer has good electromagnetic compatibility shielding and interchangeability, large facing area, small leakage inductance and distributed capacitance, high inductance value in unit space and easy installation. But this structure requires high parameter precision, needs precise mold, and has relatively higher cost. Due to the special shape of the tank type transformer, it is not suitable for heat dissipation, so when used for high-power transformer, the heat dissipation problem needs to be considered. The nested loosely coupled transformer not only can reduce the eddy current loss under the alternating current transformer magnetic field to the greatest extent, but also can reduce the weight and volume of the device. But this structure is easy to cause contact between windings when rotating at high speed, so it is more suitable for low-speed rotating system, or it can be solved by sacrificing the magnetic permeability to increase the air gap. The up-down separated loosely coupled transformer inherits the advantages of the tank type loosely coupled transformer, and can transfer more power under the same volume and weight, but it also causes poor heat dissipation of the transformer internal coil and high temperature rise.

[0004] In view of the above problems, the patent provides a C-shaped iron core combined rotary loose coupling transformer structure, which reduces the size, weight, cost and volume of the transformer, limits the temperature rise of the transformer in the working state, improves the power transmission effect of the transformer, guarantees the performance of the transformer in the long-term high-speed operation process, and ensures the safety of the whole system. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a new rotary non-contact high coupling coefficient loose coupling transformer with small volume and weight, good safety and high transmission efficiency in view of the above-mentioned deficiencies of the prior art.

[0006] To solve the above technical problems, the technical scheme adopted by the present application is:

[0007] A C-shaped iron core combined rotary loose coupling transformer, comprising a fixed assembly and a rotating assembly.

[0008] The fixed assembly comprises a fixed core (101, 102, 103), a first fixed winding (104) and a second fixed winding (105), and a fixed side circuit (107).

[0009] The fixed core (101, 102, 103) is composed of a plurality of independent cores distributed circumferentially around the outer periphery of the rotating shaft (201), and the fixed core (101, 102, 103) and the rotating shaft (201) are fixed by a rotating bearing (206); the longitudinal section of the fixed core (101, 102, 103) is in the shape of a "C" with the opening facing upwards, comprising a first fixed core (101), a second fixed core (102) and a third fixed core (103).

[0010] The first fixed winding (104) is wound around the inner wall of the second fixed core (102), and the second fixed winding (105) is embedded in the inner wall of the second fixed core (102); the first fixed winding (104) and the second fixed winding (105) are connected in series, and then connected with the fixed side circuit (107).

[0011] The rotating assembly comprises a rotating magnetic core (204), a rotating shaft (201), a rotating clamping groove (202), a rotating bearing (206), a first radial rotating ring (203), a second radial rotating ring (205), a first rotating winding (207) and a second rotating winding (208), and a rotating side circuit (210).

[0012] The rotating magnetic core (204) is composed of a radial annular ring of magnetic conductive material and non-magnetic conductive material, the radial rotating magnetic core (204) is inserted through the gap above the fixed core (101, 102, 103) and located between the first fixed core (101); the annular ring and the gap on both sides of the fixed core (101, 102, 103) have air gaps; the circumferential rotating magnetic core (204) is connected with the first radial rotating annular ring (203) at the upper part and connected with the second radial rotating annular ring (205) at the lower part; the second radial rotating annular ring (205) is connected to the rotating shaft (201) through the rotating magnetic core (204), the first radial rotating annular ring (203) and the rotating clamping groove (202);

[0013] The first rotating winding (207) is embedded on the inner wall of the first radial rotating annular ring (203), and the second rotating winding (208) is wound on the outer wall of the radial rotating annular ring; the first rotating winding (207) and the second rotating winding (208) are connected in series and then connected with the rotating side circuit (210).

[0014] The fixed side circuit (107) is composed of a filter capacitor C1, a series resonance capacitor C2, a resonance inductor L k1 , and a two-phase full-bridge H1; the rotating side circuit (210) is composed of a series resonance capacitor C3, a resonance inductor L k2 , a two-phase full-bridge H2, a filter capacitor C4, and a three-phase full-bridge H4; the two-phase full-bridge H1, the resonance capacitor C2, the resonance inductor L k1 , the resonance capacitor C3, the resonance inductor L k2 , the two-phase full-bridge H2, and the high-frequency loose coupling transformer winding together constitute a CLLC resonance circuit.

[0015] The fixed side circuit (107) is composed of a filter capacitor C1, a series resonance capacitor C2, a leakage inductor L k1 , and a two-phase full-bridge H1; the rotating side circuit (210) is composed of a series resonance capacitor C3, a leakage inductor L k2 , a two-phase full-bridge H2, a filter capacitor C4, and a three-phase full-bridge H4; the two-phase full-bridge H1, the resonance capacitor C2, the resonance inductor L k1 , the resonance capacitor C3, the resonance inductor L k2 , the two-phase full-bridge H2, and the high-frequency loose coupling transformer winding together constitute a CLLC resonance circuit.

[0016] The fixed side circuit (107) is composed of a filter capacitor C1, a leakage inductor L k1 , and a two-phase full-bridge H1; the rotating side circuit (210) is composed of a leakage inductor L k2 , and a two-phase matrix converter MC1.

[0017] The fixed side circuit (107) is composed of a filter capacitor C1, a leakage inductor L k1, and two-phase full-bridge H1 constitutes; the rotating side circuit (210) is constituted by leakage inductance L k2 , and three-phase matrix converter MC2 constitutes.

[0018] The magnetic conductive material of the radial rotating magnetic core (204) is suitably selected from ferrite material or SMC material, the non-magnetic conductive material is suitably selected from acrylic material, carbon fiber material and other non-ferromagnetic materials, and the first fixed core (101), the second fixed core (102) and the third fixed core (103) are suitably made of ultrathin silicon steel sheet, nanocrystalline material and the like.

[0019] The present application has the following beneficial effects:

[0020] 1. The rotating magnetic core (204) of the present application is composed of magnetic conductive material and non-magnetic conductive material to form a radial circular ring, which results in light weight and low centrifugal stress of the rotating magnetic core (204).

[0021] 2. The ultrathin silicon steel sheet, nanocrystalline material and the like have the advantages of high magnetic permeability, small coercive force, small eddy current loss, high hardness and high-frequency high-efficiency work, and the fixed core (101, 102, 103) of the present application is stacked with the ultrathin silicon steel sheet or nanocrystalline material, which improves the conduction efficiency of the transformer, reduces the temperature rise of the transformer and increases the safety of the transformer.

[0022] 3. The present application compensates the capacitance of the fixed side circuit (107) and the rotating side circuit (210) of the transformer, which significantly improves the power transmission capacity of the rotating transformer.

[0023] 4. The rotating side circuit (210) of the present application is directly connected in series with the matrix converter, which reduces the intermediate energy storage link, and reduces the cost, volume and weight of the transformer.

[0024] 5. The loose coupling transformer of the present application ensures that the magnetic field density of the iron core at any moment is not affected by the rotation of the secondary side of the transformer through the structural design of the iron core, which improves the transmission performance of the rotating loose coupling transformer.

[0025] 6. The winding of the present application adopts staggered winding, which allows the leakage inductance to be reduced in the case of significantly increasing the magnetic air gap length.

[0026] 7. The present application vertically inserts the rotating magnetic core (204) into the fixed core (101, 102, 103), and fixes the fixed core (101, 102, 103) and the rotating shaft (201) with the rotating bearing (206), which avoids the problem of the rotating magnetic core (204) mistakenly touching the fixed core (101, 102, 103) due to the loosening of the rotating clamping slot (202) in the high-speed long-term operation, and increases the safety of the rotating transformer. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1A radial cross-section structure schematic diagram of a C-type iron core combined rotary loose coupling transformer is shown.

[0028] Figure 2 A structure schematic diagram of a C-type iron core combined rotary loose coupling transformer in embodiment 1 is shown.

[0029] Figure 3 A structure schematic diagram of a C-type iron core combined rotary loose coupling transformer in embodiment 2 is shown.

[0030] Figure 4 A structure schematic diagram of a C-type iron core combined rotary loose coupling transformer in embodiment 3 is shown.

[0031] Figure 5 A typical circuit connection diagram of a C-type iron core combined rotary loose coupling transformer outputting two-phase alternating current is shown.

[0032] Figure 6 A typical circuit connection diagram of a C-type iron core combined rotary loose coupling transformer outputting three-phase alternating current is shown.

[0033] Figure 7 A circuit connection diagram of an AC / AC frequency conversion circuit outputting two-phase alternating current for a two-phase matrix converter is shown.

[0034] Figure 8 A circuit connection diagram of an AC / AC frequency conversion circuit outputting three-phase alternating current for a three-phase matrix converter is shown.

[0035] Among them:

[0036] 1. Fixed assembly:

[0037] 101, first fixed iron core; 102, second fixed iron core; 103, third fixed iron core; 104, first fixed winding; 105, second fixed winding; 106, fixed winding composed of two series fixed windings; 107, fixed side circuit.

[0038] 2. Rotary assembly:

[0039] 201, rotating shaft; 202, rotating clamping groove; 203, first radial rotating ring; 204, rotating magnetic core (204a, rotating magnetic core ferrite part; 204b, rotating magnetic core acrylic part); 205, second radial rotating ring; 206, rotating bearing; 207, first rotating winding; 208, second rotating winding; 209, rotating winding composed of two series rotating windings; 210, rotating side circuit. DETAILED DESCRIPTION

[0040] The application will be described in further detail below with reference to the drawings and specific preferred embodiments.

[0041] In the description of the application, it should be understood that the terms "left side", "right side", "upper part", "lower part" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and "first", "second" and the like do not represent the importance of the parts, and therefore cannot be understood as a limitation on the application. The specific dimensions used in the embodiments are only for the purpose of illustrating the technical solutions and do not limit the protection scope of the application.

[0042] Embodiment 1

[0043] As shown in Figure 1 A new type of bidirectional electric energy transmission rotary transformer, comprising a fixed assembly 1 and a rotating assembly 2.

[0044] The fixed assembly is preferably fixed by an external support, and the fixed assembly comprises a fixed core (101, 102, 103), a first fixed winding (104) and a second fixed winding (105), and a fixed side circuit (107).

[0045] The fixed core (101, 102, 103) is composed of a plurality of independent cores distributed circumferentially on the outer periphery of the rotating shaft (201), and the fixed core (101, 102, 103) and the rotating shaft (201) are fixed by a rotating bearing (206); the longitudinal section of the fixed core (101, 102, 103) is in the shape of a "C" with the opening facing upwards, comprising a first fixed core (101), a second fixed core (102) and a third fixed core (103); the first fixed winding (104) is wound on the inner wall of the second fixed core (102), and the second fixed winding (105) is embedded in the inner wall of the second fixed core (102); the first fixed winding (104) and the second fixed winding (105) are connected in series, and then connected with the fixed side circuit (107).

[0046] The rotating assembly is preferably fixed on the rotating device and rotates synchronously with the rotating device, and the rotating assembly comprises a rotating magnetic core (204), a rotating shaft (201), a rotating clamping groove (202), a rotating bearing (206), a first radial rotating ring (203), a second radial rotating ring (205), a first rotating winding (207) and a second rotating winding (208), and a rotating side circuit (210).

[0047] The rotating magnetic core (204) is a radial ring composed of a composite of magnetic and non-magnetic materials. The radial rotating magnetic core (204) is inserted through a notch above the fixed iron cores (101, 102, 103) and is located between the first fixed iron cores (101). Air gaps are left on both sides of the notch between the ring and the fixed iron cores (101, 102, 103). The upper part of the circumferential rotating magnetic core (204) is connected to the first radial rotating ring (203), and the lower part is connected to the second radial rotating ring (205). The second radial rotating ring (205) is connected to the rotating shaft (201) through the rotating magnetic core (204), the first radial rotating ring (203), and the rotating slot (202).

[0048] The first rotating winding (207) is embedded on the inner wall of the first radial rotating ring (203), and the second rotating winding (208) is wound on the outer wall of the radial rotating ring;

[0049] The first rotating winding (207) and the second rotating winding (208) are connected in series and then connected to the rotating side circuit (210).

[0050] The magnetic material of the radial rotating magnetic core (204) is preferably ferrite or SMC, and the non-magnetic material is preferably acrylic, carbon fiber or other non-ferromagnetic materials. The first fixed core (101), the second fixed core (102) and the third fixed core (103) are preferably made of ultra-thin silicon steel sheets, nanocrystals or other materials.

[0051] like Figure 1 and 2 The fixed winding and rotating winding shown are radially annular. During normal operation, a high-frequency alternating current is applied to the two series-connected fixed windings, resulting in electromagnetic induction. The first fixed iron core (101), the second fixed iron core (102), and the radial rotating magnetic core (204) generate a magnetic circuit. The magnetic field generated is induced in the rotor winding through this magnetic circuit, outputting an alternating voltage.

[0052] like Figure 5 and 6 The alternating voltage, after passing through the rectifier bridge and inverter bridge (which rotates with the rotating component), obtains the required high-frequency alternating current, which supplies power to the electrical equipment on the rotating shaft (201), thus realizing contactless power transmission.

[0053] like Figure 7 and 8 After passing through the matrix converter (which rotates with the rotating component), the alternating voltage directly obtains the required high-frequency alternating current, which supplies power to the electrical equipment on the rotating shaft (201), thus realizing contactless power transmission.

[0054] In the present embodiment 1, the rotating magnetic core (204) is connected to the rotating shaft through the first radial rotating ring (203) and the rotating slot (202), is vertically inserted into the first fixed core (101), and is matched with the rotating shaft (201) bearing, so as to avoid the possibility that the rotating core is miscontacted with the fixed core (101, 102, 103) due to the loosening of the slot in long-term high-speed operation, and to improve the coupling coefficient and reduce the magnetic leakage. The rotating magnetic core (204) is composed of a radial ring of magnetic conductive material and non-magnetic conductive material, so as to reduce the weight and volume of the rotor. The first fixed core (101), the second fixed core (102) and the third fixed core (103) are preferably made of ultra-thin silicon steel sheet, nanocrystalline and other materials, so as to make the stator have high hardness, good safety, improved transmission efficiency under high frequency, and reduced leakage inductance and temperature rise.

[0055] Embodiment 2

[0056] As shown in Figure 3 , it is basically the same as embodiment 1, except for the change of the position of the air gap and the position of the winding. In the present embodiment 2, the position of the air gap is no longer in the middle of the first fixed core (101), but is offset towards the shaft. The first fixed winding (104) and the second fixed winding (105) are series wound in the inner wall of the second fixed core (101) near the shaft, and the first rotating winding (207) and the second rotating winding (208) are series wound outside the second radial rotating ring (205), forming a winding structure as shown in Figure 3 . The nested structure avoids embedding the winding on the rotating magnetic core (204) and the fixed core (101, 102, 103), improves the safety and service life of the loose coupling transformer, changes the position of the air gap, reduces the material cost, and reduces the cross-sectional area of the magnetic circuit, reduces the power loss, and improves the power transmission efficiency.

[0057] Embodiment 3

[0058] As shown in Figure 4 , it is basically the same as embodiment 1, and the purpose is the same as that of embodiment 2, which is to solve the problem of low safety and short service life of embedded winding. The first fixed winding (104) is wound on the first fixed core (101) near the shaft, the second fixed winding (105) is wound on the first fixed core (101) far from the shaft, and the first rotating winding (207) and the second rotating winding (208) are series wound outside the rotating magnetic core (204) in turn.

[0059] Circuit structure

[0060] As shown in Figures 5-6 , the fixed side circuit (107) includes the first fixed winding (104) and the second fixed winding (105) in series, and the rotating side circuit (210) includes the first rotating winding (207) and the second rotating winding (208) in series.

[0061] The transformer in the application can be used in practice, the first fixed winding (104) and the second rotating winding (208) can be used as resonant inductance to participate in resonance; thus, the resonant capacitor C2 is connected in series on the fixed side circuit (107), and the resonant capacitor C3 is connected in series on the rotating side circuit (210) to participate in compensation.

[0062] Specifically, in the fixed side circuit (107), the first fixed winding (104) is connected in series with the resonant capacitor C2 first to form a fixed side resonant tank, and then connected in series with the second fixed winding (105). Among them, the first fixed winding (104) participates in resonance. In the rotating side circuit (210), the first rotating winding (207) is connected in series with the resonant capacitor C2 first to form a rotating side resonant tank, and then connected in series with the second rotating winding (208). Among them, the first rotating winding (207) participates in resonance. The addition of the resonant network makes it easier for the switch tube to achieve soft switching, reduces the eddy current loss of the transformer, and improves the utilization rate of electric energy.

[0063] Figure 5 The fixed side circuit (107) circuit is: DC side input DC, AC through H1 full-bridge inverter, and fixed side resonant tank and high frequency transformer in series.

[0064] The rotating side circuit (210) circuit is: high frequency transformer output AC, in series with rotating side resonant tank, DC through full-bridge H2 rectification, and then two-phase full-bridge H3 inverter output required two-phase AC.

[0065] H1 bridge includes four power switch tubes S11-S14, H2 bridge includes four power switch tubes S21-S24, and H3 bridge includes four power switch tubes S31-S34.

[0066] Figure 6 The fixed side circuit (107) circuit is: DC side input DC, AC through H1 full-bridge inverter, and fixed side resonant tank and high frequency transformer in series.

[0067] The rotating side circuit (210) circuit is: high frequency transformer output AC, in series with rotating side resonant tank, DC through full-bridge H2 rectification, and then three-phase full-bridge H4 inverter output required three-phase AC.

[0068] H1 bridge includes four power switch tubes S11-S14, H2 bridge includes four power switch tubes S21-S24, and H4 bridge includes four power switch tubes S41-S46.

[0069] As Figures 7-8As shown, the fixed side circuit (107) comprises a first fixed winding (104) and a second fixed winding (105) connected in series, and the rotating side circuit (210) comprises a first rotating winding (207) and a second rotating winding (208) connected in series.

[0070] In actual application, the rotating side circuit (210) can be directly connected in series with the matrix converter, and the intermediate energy storage link of the traditional circuit is omitted.

[0071] Figure 7 The fixed side circuit (107) circuit is: DC side input DC, AC through H1 full-bridge inverter, and then connected in series with the high-frequency transformer.

[0072] The rotating side circuit (210) circuit is: the high-frequency transformer outputs AC, which is directly connected in series with the two-phase matrix converter, and outputs the required two-phase AC.

[0073] The H1 bridge comprises four power switch tubes S11-S14, and the MC1 two-phase matrix converter comprises eight power switch tubes Sap1, Sap2, San1, San2, Sbp1, Sbp2, Sbn1 and Sbn2. Sxp1 and Sxp2, Sxn1 and Sxn2 are connected in series at the common emitter (x is a or b), and a direction-controllable bidirectional switch is realized.

[0074] Figure 8 The fixed side circuit (107) circuit is: DC side input DC, AC through H1 full-bridge inverter, and then connected in series with the high-frequency transformer.

[0075] The rotating side circuit (210) circuit is: the high-frequency transformer outputs AC, which is directly connected in series with the three-phase matrix converter, and outputs the required three-phase AC.

[0076] The H1 bridge comprises four power switch tubes S11-S14, and the MC2 three-phase matrix converter comprises twelve power switch tubes Sap1, Sap2, San1, San2, Sbp1, Sbp2, Sbn1, Sbn2, Scp1, Scp2, Scn1 and Scn2. Sxp1 and Sxp2, Sxn1 and Sxn2 are connected in series at the common emitter (x is a or b or c), and a direction-controllable bidirectional switch is realized.

[0077] The above describes the preferred embodiments of the present application in detail, but the present application is not limited to the specific details in the above embodiments, and various equivalent transformations can be made to the technical solutions of the present application within the technical concept range of the present application, and these equivalent transformations all belong to the protection range of the present application.

Claims

1. A C-core combined rotary loose coupling transformer comprising: The fixed assembly and the rotating assembly are characterized in that the fixed assembly comprises fixed cores (101, 102, 103), first fixed windings (104) and second fixed windings (105), and a fixed side circuit (107); The rotating assembly comprises rotating cores (204), a rotating shaft (201), rotating clamping grooves (202), rotating bearings (206), first radial rotating rings (203), second radial rotating rings (205), first rotating windings (207) and second rotating windings (208), and a rotating side circuit (210); The fixed cores (101, 102, 103) are composed of a plurality of independent cores distributed circumferentially on the outer periphery of the rotating shaft (201), and the fixed cores (101, 102, 103) and the rotating shaft (201) are fixed by the rotating bearings (206); the longitudinal section of the fixed cores (101, 102, 103) is in the shape of a "C" with the opening facing upwards, comprising a first fixed core (101), a second fixed core (102) and a third fixed core (103); The first fixed windings (104) are wound on the inner wall of the second fixed core (102), and the second fixed windings (105) are embedded in the inner wall of the second fixed core (102); the first fixed windings (104) and the second fixed windings (105) are connected in series, and then connected with the fixed side circuit (107); The rotating cores (204) are composed of a radial ring of magnetic conductive material and non-magnetic conductive material, and are inserted through the gap above the fixed cores (101, 102, 103) and located between the first fixed cores (101); the radial ring of the rotating cores (204) and the gap on both sides of the fixed cores (101, 102, 103) have air gaps; the upper part of the circumferential rotating core (204) is connected with the first radial rotating ring (203), and the lower part is connected with the second radial rotating ring (205); the second radial rotating ring (205) is connected to the rotating shaft (201) through the rotating core (204), the first radial rotating ring (203) and the rotating clamping groove (202); The first rotating windings (207) are embedded on the inner wall of the first radial rotating ring (203), and the second rotating windings (208) are wound on the outer wall of the radial rotating ring; the first rotating windings (207) and the second rotating windings (208) are connected in series, and then connected with the rotating side circuit (210).

2. The C-shaped core combined rotating loose coupling transformer according to claim 1, characterized in that: The fixed side circuit (107) is composed of a filter capacitor C1, a series resonance capacitor C2, a resonance inductor Lk1, and a two-phase full-bridge H1; The rotating side circuit (210) is composed of a series resonance capacitor C3, a resonance inductor Lk2, a two-phase full-bridge H2, a filter capacitor C4, and a two-phase full-bridge H3; The two-phase full-bridge H1, the resonance capacitor C2, the resonance inductor Lk1, the resonance capacitor C3, the resonance inductor Lk2, the two-phase full-bridge H2, and the high-frequency loose coupling transformer winding together constitute a CLLC resonance circuit.

3. The C-shaped core combined rotary loose coupling transformer according to claim 1, wherein the fixed side circuit (107) is composed of a filter capacitor C1, a series resonance capacitor C2, a leakage inductance Lk1, and a two-phase full bridge H1; the rotating side circuit (210) is composed of a series resonance capacitor C3, a leakage inductance Lk2, a two-phase full bridge H2, a filter capacitor C4, and a three-phase full bridge H4. The two-phase full bridge H1, the resonance capacitor C2, the resonance inductance Lk1, the resonance capacitor C3, the resonance inductance Lk2, the two-phase full bridge H2, and the high-frequency loose coupling transformer winding together constitute a CLLC resonance circuit.

4. The C-shaped core combined rotary loose coupling transformer according to claim 1, wherein the fixed side circuit (107) is composed of a filter capacitor C1, a leakage inductance Lk1, and a two-phase full bridge H1. The rotating side circuit (210) is composed of a leakage inductance Lk2 and a two-phase matrix converter MC1.

5. The C-shaped core combined rotary loose coupling transformer according to claim 1, wherein the fixed side circuit (107) is composed of a filter capacitor C1, a leakage inductance Lk1, and a two-phase full bridge H1. The rotating side circuit (210) is composed of a leakage inductance Lk2 and a three-phase matrix converter MC2.

6. The C-shaped core combined rotary loose coupling transformer according to claim 1, wherein the longitudinal section of the fixed core (101, 102, 103) is in the shape of an open "C" character, including a first fixed core (101), a second fixed core (102), and a third fixed core (103). The first fixed winding (104) and the second fixed winding (105) are sequentially wound on the inner wall of the second fixed core (102). The first fixed winding (104) and the second fixed winding (105) are connected in series and then connected with the fixed side circuit (107); the radial rotating magnetic core (204) is inserted through the gap above the fixed core (101, 102, 103) and located between the first fixed core (101); there is an air gap between the gap and the fixed core (101, 102, 103); the upper part of the circumferential rotating magnetic core (204) is connected with the first radial rotating ring (203), and the lower part is connected with the second radial rotating ring (205); the second radial rotating ring (205) is connected to the rotating shaft (201) through the rotating magnetic core (204), the first radial rotating ring (203), and the rotating clamping groove (202); The first rotating winding (207) and the second rotating winding (208) are sequentially wound on the outer wall of the second radial rotating ring (205). The first rotating winding (207) and the second rotating winding (208) are connected in series and then connected with the rotating side circuit (210).

7. The C-shaped core combined rotary loose coupling transformer according to claim 1, wherein the longitudinal section of the fixed core (101, 102, 103) is in the shape of an open "C" character, including a first fixed core (101), a second fixed core (102), and a third fixed core (103). ​ ​ ​ ​ ​ The first fixed winding (104) is wound on the first fixed core (101) on the near-axis half side, and the second fixed winding (105) is wound on the first fixed core (101) on the far-axis half side; the first fixed winding (104) and the second fixed winding (105) are connected in series, and then connected with the fixed side circuit (107); The radial rotating magnetic core (204) is inserted through the gap above the fixed core (101, 102, 103) and located between the first fixed core (101); the circular ring and the gap on both sides of the fixed core (101, 102, 103) are left with air gaps; the upper part of the circumferential rotating magnetic core (204) is connected with the first radial rotating circular ring (203), and the lower part is connected with the second radial rotating circular ring (205); the second radial rotating circular ring (205) is connected to the rotating shaft (201) through the rotating magnetic core (204), the first radial rotating circular ring (203) and the rotating clamping groove (202); The first rotating winding (207) and the second rotating winding (208) are wound on the outer wall of the second radial rotating circular ring (205) in sequence; The first rotating winding (207) and the second rotating winding (208) are connected in series, and then connected with the rotating side circuit (210).

8. The C-shaped core combined rotary loose coupling transformer according to claim 1, characterized in that: The magnetic conductive material of the radial rotating magnetic core (204) is selected from ferrite material or SMC material, the non-magnetic conductive material is selected from acrylic material or carbon fiber material, and the first fixed core (101), the second fixed core (102) and the third fixed core (103) are selected from ultra-thin silicon steel sheet or nanocrystalline.

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