Three-frequency resonant type three-phase rotary transformer

Abstract

The application provides a three-frequency resonant three-phase rotary transformer and relates to the field of power electronic technology applications. The three-frequency resonant three-phase rotary transformer comprises a primary winding, three rotatable secondary windings, a cylindrical primary core, a rotatable cylindrical secondary core fixed on a rotating shaft and the rotating shaft. The primary winding comprises two annular coils placed above and below, the three secondary windings are bent into circular arcs and are placed in a cylindrical shape symmetrically around the central axis, the primary winding is sleeved on the periphery of the three secondary windings, the three secondary windings rotate around the rotating shaft, resonant currents of three resonant frequencies are sequentially passed into the primary winding, and magnetic field resonant three-phase rotary wireless power transmission is sequentially performed through the three secondary windings. The three-frequency resonant three-phase rotary transformer has the beneficial effects that the traditional mechanical three-phase conductive slip ring is replaced, mechanical wear between the brush and the slide is eliminated, three-phase power wireless transmission with high power, high efficiency, high speed and long service life is realized, manufacturing and maintenance costs are saved, and reliability is improved.

Description

Technical Field

[0001] This utility model relates to a three-phase rotary transformer, and more particularly to a three-frequency resonant three-phase rotary transformer for three-phase wireless transmission of electrical energy. Background Technology

[0002] Conductive slip rings include components such as brushes, conductive rings, brackets, and bearings. They can improve system performance, simplify system structure, and prevent wires from twisting during rotation. They are precision power transmission devices that enable wireless transmission of electrical energy, data, and image signals between two relatively rotating mechanisms.

[0003] In brushed DC motors, single-phase two-track conductive slip rings are used for DC excitation; in AC generator systems, three-phase six-track conductive slip rings are typically used for three-phase AC excitation. Conductive slip rings are also frequently used for power and signal transmission in electronic devices such as radar, rate turntables, gyroscopes, and inertial platforms, as well as in satellite solar array drive devices in spacecraft and rotary steering systems in oil drilling rigs. Military equipment, in particular, demands high reliability and long service life from conductive slip rings.

[0004] Besides the fact that the number of slides and brushes in three-phase conductive slip rings used for three-phase AC excitation has reached six, in order to simultaneously transmit power and signals, current conductive slip rings used in electronic devices and spacecraft such as radar, rate turntables, gyroscopes, and inertial platforms have reached 12 phases and 24 slides. This not only increases the size and cost of conductive slip rings, but also, due to the complex current-carrying friction and wear phenomena that occur in the brush-slip ring contact pair under the coupling of electric, thermal, and force fields, a large number of wear particles are continuously generated. This not only exacerbates surface roughness and microscopic damage, but may also lead to fluctuations in contact resistance and abnormal electrical signal transmission, seriously threatening the electrical contact stability of the system and the reliability of the slip ring service, and severely limiting the increase in the rotational speed and current of the conductive slip ring.

[0005] To overcome the technical defects of the aforementioned mechanical conductive slip rings, non-contact slip rings and rotary transformers have been developed. However, traditional non-contact slip rings and rotary transformers can usually only transmit single-phase power. Some non-contact slip rings that can transmit three-phase power are not only complex in structure, but also have low transmission power and low transmission efficiency due to the use of inductive magnetic fields to transfer energy. Summary of the Invention

[0006] To overcome the aforementioned technical deficiencies, this invention provides a three-frequency resonant three-phase rotary transformer that replaces the traditional mechanical three-phase six-slide conductive slip ring. This eliminates mechanical wear between the brushes and the slide, simplifies the structure of existing three-phase inductive non-contact slip rings, and enables high-power, high-efficiency, high-speed, and long-life wireless transmission of three-phase electrical energy. It also saves manufacturing and maintenance costs and improves reliability.

[0007] The technical solution adopted by this invention to solve its technical problem is:

[0008] A three-frequency resonant three-phase rotary transformer includes a primary winding, three rotatable secondary windings, a cylindrical primary core, a rotatable cylindrical secondary core, a magnetic shielding sleeve, and a rotating shaft. The cylindrical secondary core is fixed to the rotating shaft by the magnetic shielding sleeve and rotates with the shaft. The primary winding includes two annular coils placed vertically and connected in series. The three rotatable secondary windings are each bent into an arc shape and symmetrically arranged around a central axis to form a cylindrical structure. The primary winding is nested around the three secondary windings, forming a nested structure with the primary winding on the outside and the three rotatable secondary windings on the inside.

[0009] When the three secondary windings rotate around the central axis at a speed of n, three resonant currents of resonant frequency are sequentially passed through the primary winding, generating three resonant magnetic fluxes in sequence. These fluxes sequentially interact with the three secondary windings, which have fixed resonant frequencies, to achieve magnetic field resonance-type three-phase rotating wireless power transmission. To increase the magnetic field coupling coefficient between the primary winding and the three secondary windings and to increase the resonant magnetic flux, the primary winding is fixed on the inner wall of the cylindrical primary core, and the three secondary windings are fixed on the cylindrical surface of the cylindrical secondary core. An air gap is created between the inner wall of the primary core and the cylindrical surface of the secondary core.

[0010] The materials used to manufacture the primary and secondary iron cores can be magnetic materials such as ferrite, silicon steel, iron-silicon, magnetic powder core, amorphous, and nanocrystalline; the conductor materials used to manufacture the primary and secondary windings can be single-strand copper wire, multi-strand copper wire, copper foil, multi-strand stranded wire, or flat vertical winding wire.

[0011] A three-frequency resonant three-phase rotating wireless power transmission system includes an input power supply, a three-frequency inverter, a three-frequency compensation network, a transmitting coil, three rotatable receiving coils, three resonant compensation and filtering networks, three diode rectifier circuits, and three-phase rotating windings of a three-phase motor; the transmitting coil and the three rotatable receiving coils constitute a three-frequency resonant three-phase rotating transformer.

[0012] The three-frequency resonant three-phase rotary transformer is used in the three-frequency resonant three-phase rotary wireless power transmission system: DC power supply, through a three-frequency inverter and a three-frequency resonant compensation network, sequentially applies three resonant frequency transmitting resonant voltages to the transmitting coil of the three-frequency resonant three-phase rotary transformer, generating three resonant frequency transmitting resonant currents, and sequentially generating three resonant magnetic fluxes. Through resonant magnetic flux coupling, these fluxes sequentially resonate with the three-phase receiving coil and its compensation network, inducing three-phase receiving resonant voltages and three-phase receiving resonant currents in the three receiving coils. These three-phase receiving resonant voltages and three-phase receiving resonant currents sequentially pass through three diode rectifier circuits to generate three-phase rotating winding voltages for the three-phase motor, supplying power to the three-phase rotating windings of the three-phase motor and driving the three-phase motor to operate.

[0013] The beneficial effects of this invention are as follows: This invention provides a three-frequency resonant three-phase rotary transformer, which replaces the traditional mechanical three-phase six-slide conductive slip ring, achieving high-efficiency rotating wireless transmission of three-phase electrical energy, saving manufacturing and maintenance costs, and improving reliability. Furthermore, this invention can be extended to two-phase and more-phase multi-frequency resonant multi-phase rotary transformers, achieving synchronous rotating wireless transmission of more phase power and signals. It can be widely used for three-phase wireless excitation of AC generators, for wireless power transmission of the three-phase six-wire switched reluctance electromagnetic slip clutch in the patents applied for by the inventors of this patent—switched reluctance electromagnetic speed-regulating motor patents (application numbers: 201310027092.8, 202010769920.5), for wireless transmission of multi-phase power and multi-channel signals in electronic devices such as radar, rate turntables, gyroscopes, and inertial platforms, as well as in satellite solar cell array drive devices in spacecraft, and in oil drilling rotary guide devices, and in new energy hybrid vehicles, ships, and aircraft using engines and motors as prime movers.

[0014] The following description, in conjunction with the accompanying drawings, illustrates specific embodiments. Attached Figure Description

[0015] To more clearly illustrate the embodiments, the accompanying drawings used in the embodiments are briefly described below. Obviously, the drawings described below are merely some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0016] Figure 1 This is a front view of the primary winding structure of a three-frequency resonant three-phase rotary transformer.

[0017] Figure 2 This is a front view of the three-phase secondary winding structure of a three-frequency resonant three-phase rotary transformer.

[0018] Figure 3 yes Figure 1 , 2 A front view of a three-phase rotary transformer with its primary winding positioned around the three-phase secondary winding.

[0019] Figure 4 This is a front view of the primary core structure of a three-frequency resonant three-phase rotary transformer.

[0020] Figure 5 yes Figure 1 and Figure 4 A front view of a three-frequency resonant three-phase rotary transformer in which the primary winding is placed inside a cylindrical primary core.

[0021] Figure 6 yes Figure 3 A front view of a three-phase rotary transformer with three-frequency resonant windings placed on the surface of a cylindrical secondary core and primary windings placed around the three-phase secondary windings.

[0022] Figure 7 yes Figure 6 A front view of a three-phase rotary transformer with a transparent secondary core.

[0023] Figure 8 yes Figure 4 , 6 A front view of the structure of a three-frequency resonant three-phase rotary transformer.

[0024] Figure 9 Is adopted Figure 8 The circuit topology diagram of a three-frequency resonant three-phase rotary transformer wireless power transmission system.

[0025] Figure 10 yes Figure 2 The main view of one phase secondary winding structure of the second type of three-frequency resonant three-phase rotary transformer.

[0026] Figure 11 yes Figure 2 , 10 The main view of the three-phase secondary winding structure of the second type of three-frequency resonant three-phase rotary transformer.

[0027] Figure 12 yes Figure 3 , 11 The main view of the structure of the second type of three-frequency resonant three-phase rotary transformer, in which the primary winding is placed outside the three-phase secondary winding.

[0028] Figure 13 yes Figure 5 The main structural view of the primary core and primary winding of the third type of three-frequency resonant three-phase rotary transformer.

[0029] Figure 14 yes Figure 13 P1-P2 section view.

[0030] Figure 15 yes Figure 6 The main structural view of the rotatable secondary core of the third type of three-frequency resonant three-phase rotary transformer.

[0031] Figure 16 yes Figure 15 Planar views of P3-P4.

[0032] Figure 17 yes Figure 15 The main structural view of the secondary core and three-phase secondary windings of the third type of three-frequency resonant three-phase rotary transformer.

[0033] Figure 18 yes Figure 17 Planar views P5-P6.

[0034] Figure 19 yes Figure 14 , 18 A cross-sectional view of the third type of three-frequency resonant three-phase rotary transformer.

[0035] Figure 20 yes Figure 19 The structural plan view of the fourth type of three-frequency resonant three-phase rotary transformer.

[0036] Figure 21 yes Figure 19 The structural planar view of the fifth type of three-frequency resonant three-phase rotary transformer.

[0037] Figure 22 yes Figure 21 The P7-P8 planar views of the fifth type of three-frequency resonant three-phase rotary transformer.

[0038] Figure 23 yes Figure 13 The main view of the primary core structure of the sixth type of three-frequency resonant three-phase rotary transformer.

[0039] Figure 24 yes Figure 23 M1-M2 planar views.

[0040] Figure 25 yes Figure 23 The main view of the secondary core structure of the sixth type of three-frequency resonant three-phase rotary transformer.

[0041] Figure 26 yes Figure 25 N1-N2 cross-sectional view.

[0042] Figure 27 yes Figure 23 , 25 The three-dimensional structure diagram of the three inner magnetic columns of the primary and secondary iron cores of the sixth type of three-frequency resonant three-phase rotary transformer.

[0043] Figure 28 yes Figure 23 The main structural view of the primary core and primary winding of the sixth type of three-frequency resonant three-phase rotary transformer.

[0044] Figure 29 yes Figure 28 M1-M2 planar views.

[0045] Figure 30 yes Figure 25 The main structural view of the secondary core and three-phase secondary windings of the sixth type of three-frequency resonant three-phase rotary transformer.

[0046] Figure 31 yes Figure 30 N1-N2 cross-sectional view.

[0047] Figure 32 yes Figure 29 , 31 The structural planar view of the sixth type of three-frequency resonant three-phase rotary transformer.

[0048] Figure 33 yes Figure 23 , 25 The main view of the fixed housing of the primary and secondary iron cores of the seventh type of three-frequency resonant three-phase rotary transformer.

[0049] Figure 34 yes Figure 33 M3-M4 planar views.

[0050] Figure 35 yes Figure 28 , 33 The main structural view of the primary core, primary winding, and fixed casing of the seventh type of three-frequency resonant three-phase rotary transformer.

[0051] Figure 36 yes Figure 30 , 33 The main structural view of the secondary core, three-phase secondary windings and fixed casing of the seventh type of three-frequency resonant three-phase rotary transformer.

[0052] Figure 37 yes Figure 35 , 36 The P3-P4 and P5-P6 planar views of the seventh type of three-frequency resonant three-phase rotary transformer.

[0053] Figure 38 yes Figure 1The main view of the three-phase primary winding structure of the eighth type of three-frequency resonant three-phase rotary transformer.

[0054] Figure 39 yes Figure 17 The main structural view of the primary core and three-phase primary winding of the ninth type of three-frequency resonant three-phase rotary transformer.

[0055] Figure 40 yes Figure 39 , 17 Planar views of M5-M6 and P5-P6 of the ninth type of three-frequency resonant three-phase rotary transformer.

[0056] Figure 41 yes Figure 21 The main structural view of the tenth type of three-frequency resonant three-phase rotary transformer.

[0057] In the diagram, 1—the primary winding of a three-phase rotary transformer with three-frequency resonant winding; 1-1, 1-2—the two coils of primary winding 1; A, B—the input / output terminals of primary winding 1; 2-1, 2-2, 2-3—the three secondary windings of the three-phase rotary transformer with three-frequency resonant winding; 2—the collective name for the three secondary windings 2-1, 2-2, 2-3; n—the rotational speed of the three secondary windings 2-1, 2-2, 2-3 around the central axis; i p - The current flowing through the primary winding 1; i s1 i s2 i s3- Current flowing through the three secondary windings 2-1, 2-2, and 2-3; C, D, E, F, G, and H—input / output terminals of the three secondary windings 2-1, 2-2, and 2-3; 3—primary core of the three-frequency resonant three-phase rotary transformer; 3-1—base of the flat cylindrical primary core 3; 3-2, 3-3, 34, and 3-5—the four barrel walls of the cylindrical primary core 3 from the outside to the inside; 3-3-1, 3-3-2, and 3-3- 3-The three inner magnetic pillars of the cylindrical primary core 3; 3-6-The bearing of the cylindrical primary core 3; 3-7-The shaft hole of the cylindrical primary core 3; 3-8-The fixing plate of the cylindrical primary core 3; 3-9-The notch on the outer barrel wall 3-2 of the cylindrical primary core 3; 4-The secondary core of the three-frequency resonant three-phase rotary transformer; 4-1-The base of the flat cylindrical secondary core 4; 4-2, 4-3, 4-4, 4-5-Cylindrical secondary cores 4. The four barrel walls from the outside to the inside; 4-3-1, 4-3-2, 4-3-3 - the three inner magnetic pillars of the cylindrical secondary iron core 4; 4-6 - the magnetic shielding sleeve of the cylindrical secondary iron core 4; 4-7 - the shaft hole of the cylindrical secondary iron core 4; 4-8 - the six lead holes of the three secondary windings 2-1, 2-2, 2-3 on the base 4-1 of the cylindrical secondary iron core 4; 4-9 - the three notches on the outer barrel wall 4-2 of the cylindrical secondary iron core 4; g - The air gap between the primary iron core 3 and the secondary iron core 4; h - The height of the three inner magnetic pillars 3-3-1, 3-3-2, 3-3-3 of the primary iron core 3 and the three inner magnetic pillars 4-3-1, 4-3-2, 4-3-3 of the secondary iron core 4; 5 - The rotating shaft; 6 - The flat cylindrical fixed outer shell; 6-1 - The base of the fixed outer shell 6; 6-2 - The barrel wall of the fixed outer shell 6; 6-3 - The shaft hole of the fixed outer shell 6; 6-4 - The fixing plate of the fixed outer shell 6.

[0058] V m - DC power supply for the three-frequency resonant three-phase rotating wireless power transfer system; f1, f2, f3 - the three resonant frequencies of the three-frequency resonant three-phase rotating wireless power transfer system; Tx - the three-frequency transmitting coil of the three-frequency resonant three-phase rotating wireless power transfer system; Rx1, Rx2, Rx3 - the three-frequency rotating three-phase receiving coil of the three-frequency resonant three-phase rotating wireless power transfer system; L t - Self-inductance of the transmitting coil Tx; L r1 L r2 L r3 - The self-inductance of the receiving coils Rx1, Rx2, and Rx3; M tr1 M tr2 M tr3 - Mutual inductance between the transmitting coil Tx and the three-phase receiving coils Rx1, Rx2, and Rx3; u T - Input voltage of the transmitting coil Tx; u r1 u r2 u r3- Output voltages of the three-phase receiving coils Rx1, Rx2, and Rx3; r1 i r2 i r3 - Output current of the three-phase receiving coils Rx1, Rx2, and Rx3; u a u b u c - The three-phase voltage applied to the three-phase rotating windings of a three-phase motor.

[0059] 1A, 1B, 1C - Three-phase primary windings of a three-frequency resonant three-phase rotary transformer; i p1 i p2 i p3 - The current flowing through the three-phase primary windings 1A, 1B, and 1C. Detailed Implementation

[0060] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the core ideas and embodiments of the present invention, other embodiments obtained by those skilled in the art without creative effort are all within the protection scope of the present invention.

[0061] To provide a full understanding of the invention, numerous specific details are set forth in the following detailed description, but those skilled in the art should understand that the invention can be implemented without these specific details.

[0062] Example 1:

[0063] See attached document Figures 1-8 A three-frequency resonant three-phase rotary transformer includes a primary winding 1, three rotatable secondary windings 2-1, 2-2, and 2-3, a cylindrical primary core 3, a rotatable cylindrical secondary core 4, a magnetic shielding sleeve 4-6, and a rotating shaft 5. The cylindrical secondary core 4 is fixed to the rotating shaft 5 by the magnetic shielding sleeve 4-6 and rotates with the rotating shaft 5 at a rotational speed n.

[0064] The primary winding 1 includes two ring coils 1-1 and 1-2 placed vertically and connected in series. The three rotatable secondary windings 2-1, 2-2, and 2-3 are bent into arc shapes and placed symmetrically around the central axis into a cylindrical shape. The primary winding 1 is nested around the three secondary windings 2-1, 2-2, and 2-3, forming a nested structure with the primary winding 1 on the outside and the three secondary windings 2-1, 2-2, and 2-3 on the inside.

[0065] When the three secondary windings 2-1, 2-2, and 2-3 rotate around the central axis at a rotational speed n, three resonant currents i with resonant frequencies f1, f2, and f3 are sequentially passed through the primary winding 1. p Three resonant magnetic fluxes Φ1, Φ2, and Φ3 are generated sequentially, which are then connected to three secondary windings 2-1, 2-2, and 2-3 with fixed resonant frequencies f1, f2, and f3 to achieve magnetic field resonant three-phase rotating wireless power transmission.

[0066] In order to improve the magnetic field coupling coefficient between the primary winding 1 and the three secondary windings 2-1, 2-2, and 2-3, and increase the resonant magnetic fluxes Φ1, Φ2, and Φ3, the primary winding 1 is fixed on the inner wall of the cylindrical primary core 3, and the three secondary windings 2-1, 2-2, and 2-3 are fixed on the cylindrical surface of the secondary core 4. An air gap g is placed between the inner wall of the primary core 3 and the cylindrical surface of the secondary core 4.

[0067] The primary and secondary cores can be made of magnetic materials such as ferrite, silicon steel, iron-silicon, magnetic powder core, amorphous, and nanocrystalline; the conductors of the primary and secondary windings can be made of single-strand copper wire, multi-strand copper wire, copper foil, Lizi wire, or flat vertical winding wire.

[0068] See attached document Figure 9 A three-frequency resonant three-phase rotating wireless power transfer system includes an input power supply V. in The system includes a three-frequency (f1, f2, f3) inverter, a three-frequency (f1, f2, f3) compensation network, a transmitting coil Tx, three rotatable receiving coils Rx1, Rx2, Rx3, three resonant (first resonant frequency f1, second resonant frequency f2, third resonant frequency f3) compensation and filtering networks, three diode rectifier circuits, and three-phase rotating windings of a three-phase motor. The transmitting coil Tx and the three rotatable receiving coils Rx1, Rx2, Rx3 form a three-frequency resonant three-phase rotary transformer. The self-inductance of the transmitting coil Tx is L. t The self-inductances of the three rotatable receiving coils Rx1, Rx2, and Rx3 are L respectively. r1 L r2 L r3 The mutual inductances between the transmitting coil Tx and the three rotatable receiving coils Rx1, Rx2, and Rx3 at the three resonant frequencies f1, f2, and f3 are respectively M. tr1 M tr2 M tr3 .

[0069] See attached document Figure 8 , 9 ,Will Figure 8 The three-frequency resonant three-phase rotary transformer is used for Figure 9 The three-frequency resonant three-phase rotating wireless power transmission system: DC power supply Vin Through a three-frequency (f1, f2, f3) inverter and a three-frequency (f1, f2, f3) resonant compensation network, three resonant voltages u at resonant frequencies f1, f2, and f3 are sequentially applied to the transmitting coil Tx of the three-frequency resonant three-phase rotary transformer. T This sequentially generates three resonant currents i at resonant frequencies f1, f2, and f3. T Three resonant magnetic fluxes Φ1, Φ2, and Φ3 are generated sequentially. Through magnetic field coupling, these fluxes resonate sequentially with three receiving coils Rx1, Rx2, and Rx3 and their compensation network, inducing three receiving resonant voltages u in the three receiving coils Rx1, Rx2, and Rx3. r1 u r2 u r3 and receiving resonant current i r1 i r2 i r3 The three-phase motor generates three-phase rotating winding voltages ua, ub, and uc through three diode rectifier circuits, which drive the three-phase motor to run.

[0070] Example 2:

[0071] See attached document Figures 10-12 A three-frequency resonant three-phase rotary transformer, which is based on the embodiment one. Figure 2 The three secondary windings 2-1, 2-2, and 2-3 of the three-frequency resonant three-phase rotary transformer are each made into two coils placed vertically and connected in series, and... Figure 1 The primary winding 1 is placed vertically and the two coils 1-1 and 1-2 connected in series have the same structure; the three secondary windings 2-1, 2-2, and 2-3 are placed sequentially from bottom to top, with the primary winding 1 placed around the three secondary windings 2.1, 2-2, and 2-3, forming a nested structure with the primary winding 1 on the outside and the three secondary windings 2-1, 2-2, and 2-3 on the inside, forming the second type of three-frequency resonant three-phase rotary transformer of Embodiment 2 of this patent, and used for Figure 9 The three-frequency resonant three-phase rotating wireless power transmission system.

[0072] Example 3:

[0073] See attached document Figure 13 , 14 A three-frequency resonant three-phase rotary transformer, which is based on the embodiment one. Figure 4 The primary winding core 3 is made into a flat cylindrical structure, including a base 3-1, a cylindrical outer wall 3-2, a cylindrical inner wall 3-3, a bearing 3-6, a shaft hole 3-7, and a fixing plate 3-8. A primary winding slot is formed between the cylindrical outer wall 3-2 and the cylindrical inner wall 3-3; [The text abruptly ends here, likely due to an incomplete sentence or missing information.] Figure 1 The primary winding 1 is made into a single coil structure and placed in the primary winding slot.

[0074] See attached document Figure 15 , 16 Example 1 Figure 6 The secondary iron core 4 is made into a flat cylindrical structure, including a base 4-1, cylindrical walls 4-2, 4-3, 4-4, 4-5 arranged from the outside to the inside, a magnetic shielding sleeve 4-6, and a shaft hole 4-7. Three annular secondary winding slots are formed between the cylindrical walls 4-2, 4-3, 4-4, and 4-5. Six lead holes 4-8 for the three-phase secondary windings 2-1, 2-2, and 2-3 are opened on the base 4-1.

[0075] See attached document Figures 17-18 Example 1 Figure 2 The three-phase secondary windings 2-1, 2-2, and 2-3 are made into a ring structure and placed in the three ring secondary winding slots respectively.

[0076] See attached document Figure 14 , 18 19. The primary iron core 3 with primary winding 1 installed is mounted on the rotating shaft 5 through bearing 3-6 and shaft hole 3-7. The secondary iron core 4 with three-phase secondary windings 2-1, 2-2, and 2-3 installed is mounted on the rotating shaft 5 through magnetic sleeve 4-6 and shaft hole 4-7. The side of the primary iron core 3 with primary winding 1 installed is opposite to the side of the secondary iron core 4 with three-phase secondary windings 2-1, 2-2, and 2-3 installed. An air gap g is separated between the primary iron core 3 and the secondary iron core 4 to form an adjacent structure in which the primary iron core 3 and the secondary iron core 4 are parallel.

[0077] When the shaft 5 rotates at a speed n, the primary iron core 3 and the primary winding 1 are fixed by the primary bearing 3-6 and the fixing plate 3-8 to prevent rotation and movement; the secondary iron core 4 and the three-phase secondary windings 2-1, 2-2, and 2-3 are fixed on the shaft 5 by the magnetic shielding sleeve and rotate together with the shaft 5, forming the third type of three-frequency resonant three-phase rotary transformer in the third embodiment of this patent.

[0078] Example 4:

[0079] See attached document Figure 20 A three-frequency resonant three-phase rotary transformer, in order to increase transmission power, in embodiment three... Figure 19The secondary core 4 of the three-frequency resonant three-phase rotary transformer has identical three-phase secondary winding mounting slots on both the left and right sides, and identical three-phase secondary windings 2-1, 2-2, and 2-3 are installed thereon. A primary core 3 and a primary winding 1 are respectively installed on the rotating shafts 5 on the left and right sides of the secondary core 4. The primary cores 3 and primary windings 1 on the left and right sides are respectively opposite to the three-phase secondary windings 2-1, 2-2, and 2-3 on both sides of the secondary core 4. The two primary cores 3 are separated from the left and right sides of the secondary core 4 by an air gap g, forming an adjacent structure in which a secondary core 4 is sandwiched between two primary cores 3, thus forming the fourth type of three-frequency resonant three-phase rotary transformer in Embodiment 4 of this patent.

[0080] Example 5:

[0081] See attached document Figure 21 , 22 A three-frequency resonant three-phase rotary transformer, which is described in Embodiment 3. Figure 19 The primary core 3 and secondary core 4 of the three-frequency resonant three-phase rotary transformer are changed from an adjacent structure with coaxial left and right side by side to a coaxial nested structure with inner and outer sides. The primary core 3 and the primary winding 1 are located on the outside, and the secondary core 4 and the three-phase secondary windings 2-1, 2-2, and 2-3 are located on the inside. The primary core 3 is fixed in place by the fixing plate 3-8, and the secondary core 4 is fixed on the rotating shaft 5 by the magnetic shielding sleeve 4-6 and rotates with the rotating shaft 5, forming the fifth type of three-frequency resonant three-phase rotary transformer of this patent embodiment five.

[0082] Example 6:

[0083] See attached document Figure 23 , 24 A three-frequency resonant three-phase rotary transformer, which is described in Embodiment 3. Figure 13 , 14 The cylindrical inner wall 3-3 of the primary iron core 3 becomes thinner and is divided into three mutually spaced primary iron core inner magnetic pillars 3-3-1, 3-3-2, and 3-3-3. An opening 3-9 is made in the outer cylinder wall 3-2 of the primary iron core 3.

[0084] See attached document Figure 25 , 26 The secondary iron core 4 also adopts the same structure as the primary iron core 3, including the secondary iron core chassis 4-1, the secondary iron core outer barrel wall 4-2, three secondary iron core inner magnetic pillars 4-3-1, 4-3-2, and 4-3-3, the magnetic shielding sleeve 4-6, and the shaft hole 4-7; three symmetrically distributed secondary iron core outer barrel wall notches 4-9 are opened on the secondary iron core outer barrel wall 4-2.

[0085] The three-dimensional shapes of the magnetic pillars 3-3-1, 3-3-2, and 3-3-3 inside the three primary iron cores and the magnetic pillars 4-3-1, 4-3-2, and 4-3-3 inside the three secondary iron cores are shown in the attached figure. Figure 27.

[0086] See attached document Figure 28 , 29 The primary winding 1 passes through the primary winding slot between the inner side of the outer cylinder wall 3-2 of the primary core and the outer side of the three primary core inner magnetic columns 3-3-1, 3-3-2, and 3-3-3, as well as the primary winding slot between the inner side of the three primary core inner magnetic columns 3-3-1, 3-3-2, and 3-3-3 and the primary bearing 3-6. The lead terminals A and B of the primary winding 1 pass through the notch 3-9 in the outer cylinder wall of the primary core.

[0087] See attached document Figure 30 , 31 The three-phase secondary windings 2-1, 2-2, and 2-3 pass around the three inner magnetic columns 4-3-1, 4-3-2, and 4-3-3 of the secondary core, respectively. The lead terminals C, D, E, F, G, and H of the three-phase secondary windings 2-1, 2-2, and 2-3 pass through the three outer cylinder wall notches 4-9 of the secondary core, respectively.

[0088] See attached document Figure 32 The rotating shaft 5 is passed through the shaft hole 3-7 of the primary iron core 3 and the shaft hole 4-7 of the secondary iron core 4. The side on the primary iron core 3 where the primary winding 1 is installed is opposite to the side on the secondary iron core 4 where the three-phase secondary windings 2-1, 2-2, and 2-3 are installed. An air gap g is spaced between the primary iron core 3 and the secondary iron core 4 to form an adjacent structure in which the primary iron core 3 and the secondary iron core 4 are arranged side by side.

[0089] When the shaft 5 rotates, the primary iron core 3 and the primary winding 1 are fixed in place by the primary bearing 3-6 and the fixing plate 3-8, while the secondary iron core 4 and the three-phase secondary windings 2-2, 2-2, and 2-3 rotate with the shaft 5, forming the sixth type of three-frequency resonant three-phase rotary transformer of this patent embodiment six.

[0090] Example 7:

[0091] See attached document Figure 33 , 34 A three-frequency resonant three-phase rotary transformer is manufactured with a cylindrical fixed housing 6, including a fixed housing base 6-1, a fixed housing cylinder wall 6-2, a fixed housing shaft hole 6-3, and a fixed housing fixing plate 6-4; the material used to manufacture the cylindrical iron core fixed housing 6 can be various insulating materials or metal materials.

[0092] Reference Figure 35 , 36 37, the sixth example Figure 28 , 30The primary iron core 3 and the secondary iron core 4 are respectively embedded in two cylindrical fixed shells 6; the rotating shaft 5 passes through the shaft hole 3-7 of the primary iron core 3 and the shaft hole 4-7 of the secondary iron core 4, so that the side of the primary iron core 3 on which the primary winding 1 is installed is opposite to the side of the secondary iron core 4 on which the three-phase secondary windings 2-1, 2-2, and 2-3 are installed; an air gap g is separated between the primary iron core 3 and the secondary iron core 4 to form an adjacent structure in which the primary iron core 3 and the secondary iron core 4 are arranged side by side.

[0093] When the shaft 5 rotates, the primary iron core 3, the primary winding 1 and the fixed housing 6 are fixed in place by the primary bearing 3-6 and the fixing plate 6-4, while the secondary iron core 4 and the three-phase secondary windings 2-2, 2-2 and 2-3 rotate together with the shaft 5, forming the seventh type of three-frequency resonant three-phase rotary transformer of this patent embodiment seven.

[0094] Example 8:

[0095] See attached document Figure 38 A three-frequency resonant three-phase rotary transformer, which is based on Embodiment 2. Figure 12 The single-phase primary winding 1 is increased to a three-phase primary winding 1A, 1B, and 1C, which are then wound together. Figure 11 The three-phase secondary windings 2-1, 2-2, and 2-3 are placed around the periphery of the three-phase primary windings 1A, 1B, and 1C, respectively, opposite to the three-phase secondary windings 2-1, 2-2, and 2-3, forming a nested structure with the three-phase primary windings 1A, 1B, and 1C on the outside and the three-phase secondary windings 2-1, 2-2, and 2-3 on the inside. When the three-phase secondary windings 2-1, 2-2, and 2-3 rotate with the shaft, the three-phase primary windings 1A, 1B, and 1C sequentially perform magnetic field resonance three-phase rotating wireless power transmission with their respective opposite three-phase secondary windings 2-1, 2-2, and 2-3, forming the eighth type of three-frequency resonant three-phase rotary transformer in Embodiment Eight of this patent, where both the primary and secondary windings are three-phase. In order to... Figure 38 The eighth type of three-frequency resonant three-phase rotary transformer, with both primary and secondary windings being three-phase, is used for... Figure 9 The three-frequency resonant three-phase rotating wireless power transmission system also increases the number of transmitting coils Tx from single-phase to three-phase.

[0096] Example 9:

[0097] See attached document Figure 39 , 40 A three-frequency resonant three-phase rotary transformer, wherein the primary core 3, the three-phase primary windings 1A, 1B, 1C, the secondary core 4, and the three-phase secondary windings 2-1, 2-2, 2-3 all adopt the same design as in Embodiment 3. Figure 17 , 18The secondary core 4 and the three-phase secondary windings 2-1, 2-2, and 2-3 have the same structure, forming an adjacent structure in which the primary core 3 and the secondary core 4 are arranged side by side, forming the ninth type of three-frequency resonant three-phase rotary transformer of this patent embodiment nine, in which both the primary and secondary windings have three phases.

[0098] Example 10:

[0099] See attached document Figure 41 A three-frequency resonant three-phase rotary transformer, which is described in Example 5. Figure 21 , 22 The primary winding slot of the primary core 3 is changed to three primary winding slots, and the single-phase primary winding 1 is increased to a three-phase primary winding 1A, 1B and 1C, which are placed in the three primary winding slots respectively, forming the tenth type of three-frequency resonant three-phase rotary transformer of this patent embodiment ten, in which the number of phases of the primary and secondary windings are both three-phase.

[0100] Finally, it should be noted that the above-described embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. For those skilled in the art, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. For example, the three-frequency resonant three-phase rotary transformer described in the present invention can be extended to a two-frequency resonant two-phase rotary transformer, a four-frequency resonant four-phase rotary transformer, a multi-frequency resonant multi-phase rotary transformer, and so on.

Claims

1. A three-frequency resonant three-phase rotary transformer, characterized in that: It includes a primary winding, three rotatable secondary windings, a cylindrical primary core, a rotatable cylindrical secondary core, a magnetic shielding sleeve, and a rotating shaft. The rotatable cylindrical secondary core is fixed to the rotating shaft by the magnetic shielding sleeve. The primary winding includes two ring coils placed vertically and connected in series. The three secondary windings are each bent into an arc shape and placed symmetrically around the central axis into a cylindrical shape. The primary winding is nested around the three secondary windings to form a nested structure with the primary winding on the outside and the three secondary windings on the inside. When the three secondary windings rotate around the central axis, three resonant currents of resonant frequency are sequentially passed into the primary winding, generating three resonant magnetic fluxes in sequence. These fluxes are then transmitted through the three secondary windings with fixed resonant frequencies to achieve magnetic field resonance three-phase rotating wireless power transmission. In order to increase the magnetic field coupling coefficient between the primary winding and the three secondary windings and increase the resonant magnetic flux, the primary winding is fixed on the inner wall of the cylindrical primary core, and the three rotatable secondary windings are fixed on the cylindrical surface of the cylindrical secondary core. An air gap is separated between the inner wall of the primary core and the cylindrical surface of the secondary core. The three-frequency resonant three-phase rotary transformer is used in a three-frequency resonant three-phase rotary wireless power transmission system: DC power supply, through a three-frequency inverter and a three-frequency resonant compensation network, sequentially applies three resonant frequency transmitting resonant voltages to the transmitting coil of the three-frequency resonant three-phase rotary transformer, generating three resonant frequency transmitting resonant currents, and sequentially generating three resonant magnetic fluxes, which resonate sequentially with the three-phase receiving coil and its compensation network, sequentially inducing three-phase receiving resonant voltages and three-phase receiving resonant currents in the three-phase receiving coil, which generate three-phase rotating winding voltages for the three-phase motor through three diode rectifier circuits, supplying power to the three-phase rotating windings of the three-phase motor and driving the three-phase motor to operate.

2. The three-frequency resonant three-phase rotary transformer according to claim 1, characterized in that: The three rotatable secondary windings of the three-frequency resonant three-phase rotary transformer are each made into two coils placed vertically and connected in series, the same as the structure of the two coils placed vertically and connected in series in the primary winding. The three rotatable secondary windings are placed sequentially from bottom to top, with the two coils of the primary winding placed around the three rotatable secondary windings, forming a nested structure with the primary winding on the outside and the three rotatable secondary windings on the inside, thus forming a second type of three-frequency resonant three-phase rotary transformer, which is used in the three-frequency resonant three-phase rotary wireless power transmission system.

3. The three-frequency resonant three-phase rotary transformer according to claim 1, characterized in that: The primary core is made into a flat cylindrical structure, including a base, a cylindrical outer wall, a cylindrical inner wall, a bearing, a shaft hole, and a fixing plate. A primary winding slot is formed between the cylindrical outer wall and the cylindrical inner wall. The primary winding is made into a single coil structure and placed in the primary winding slot. The secondary core is made into a flat cylindrical structure, including a base, four cylindrical walls arranged from the outside to the inside, a magnetic shielding sleeve and a shaft hole, and three annular secondary winding slots are formed between the four cylindrical walls; six lead holes for the three secondary windings are opened on the base; the three rotatable secondary windings are made into annular structures and placed in the three annular secondary winding slots respectively. The primary iron core with the primary winding installed is mounted on the rotating shaft through bearings and shaft holes. The secondary iron core with three secondary windings installed is mounted on the rotating shaft through magnetic shielding sleeves and shaft holes. The side of the primary iron core with the primary winding installed is opposite to the side of the secondary iron core with three secondary windings installed. An air gap is separated between the primary and secondary iron cores to form an adjacent structure in which the primary and secondary iron cores are arranged side by side. When the shaft rotates at a speed of n, the primary iron core and primary winding are fixed by the primary bearing and fixing plate to prevent rotation and movement; the secondary iron core and three secondary windings rotate together with the shaft to form the third type of three-frequency resonant three-phase rotary transformer.

4. The three-frequency resonant three-phase rotary transformer according to claim 3, characterized in that: To increase wireless transmission power, identical three-phase secondary winding mounting slots are opened on both the left and right sides of the secondary core, and identical three-phase secondary windings are installed thereon. A primary core and a primary winding are respectively installed on the rotating shafts on the left and right sides of the secondary core. The primary windings of the primary cores on the left and right sides are opposite to the three-phase secondary windings on both sides of the secondary core. The primary cores on the left and right sides are separated from the left and right sides of the secondary core by air gaps, forming an adjacent structure in which a secondary core is sandwiched between two primary cores, thus forming the fourth type of three-frequency resonant three-phase rotary transformer.

5. The three-frequency resonant three-phase rotary transformer according to claim 3, characterized in that: The primary and secondary cores are changed from an adjacent structure with coaxial left and right sides to an inner and outer nested structure. The primary core and primary winding are on the outside, and the secondary core and three secondary windings are on the inside. The primary core and primary winding are fixed in place by fixing plates, and the secondary core and three secondary windings are fixed on the rotating shaft by magnetic shielding sleeves and rotate with the rotating shaft, forming the fifth type of three-frequency resonant three-phase rotary transformer.

6. The three-frequency resonant three-phase rotary transformer according to claim 3, characterized in that: The cylindrical inner wall of the primary iron core is thinned and divided into three mutually spaced primary iron core inner magnetic pillars, and a notch is opened in the outer cylindrical wall of the primary iron core. The secondary iron core adopts the same structure as the primary iron core, including the secondary iron core chassis, the secondary iron core outer barrel wall, three secondary iron core inner magnetic pillars, a magnetic shielding sleeve and a shaft hole; three symmetrically distributed notches are opened on the secondary iron core outer barrel wall; The primary winding passes through the primary winding slot between the inner side of the outer wall of the primary core and the outer side of the three inner magnetic columns of the primary core, as well as the primary winding slot between the inner side of the three inner magnetic columns of the primary core and the primary bearing. The lead terminals of the primary winding pass through the outside of the notch in the outer wall of the primary core. Three rotatable secondary windings pass around the inner magnetic pillars of the three secondary iron cores respectively, and the lead terminals of the three secondary windings pass through the outside of the notches in the outer cylinder wall of the three secondary iron cores respectively; Pass the rotating shaft through the shaft holes of the primary and secondary iron cores, with the side on the primary iron core where the primary winding is installed facing the side on the secondary iron core where three secondary windings are installed. An air gap is placed between the primary and secondary iron cores to form an adjacent structure in which the primary and secondary iron cores are arranged side by side; When the shaft rotates, the primary core and primary winding are fixed in place by the primary bearing and the fixing plate, while the secondary core and three secondary windings rotate with the shaft, forming the sixth type of three-frequency resonant three-phase rotary transformer.

7. The three-frequency resonant three-phase rotary transformer according to claim 6, characterized in that: Manufacturing a cylindrical fixed housing, including a fixed housing base, cylindrical wall, shaft hole and fixing plate; The primary and secondary iron cores are respectively embedded into two fixed outer shells; the rotating shaft is passed through the shaft holes of the primary and secondary iron cores, and the side on the primary iron core where the primary winding is installed is opposite to the side on the secondary iron core where three secondary windings are installed; an air gap is separated between the primary and secondary iron cores to form an adjacent structure in which the primary and secondary iron cores are arranged side by side. When the shaft rotates, the primary core, primary winding, and fixed housing are fixed in place by the primary bearing and fixed plate, while the secondary core, three secondary windings, and fixed housing rotate with the shaft, forming the seventh type of three-frequency resonant three-phase rotary transformer.

8. The three-frequency resonant three-phase rotary transformer according to claim 2, characterized in that: The single primary winding is increased to three primary windings, which are then nested around three rotatable secondary windings. The three primary windings are placed opposite the three secondary windings, forming a nested structure with the three primary windings on the outside and the three secondary windings on the inside. When the three secondary windings rotate with the shaft, the three primary windings resonate with their respective three opposite secondary windings to transmit electrical energy wirelessly, forming the eighth type of three-frequency resonant three-phase rotary transformer with both primary and secondary windings being three-phase.

9. The three-frequency resonant three-phase rotary transformer according to claim 3, characterized in that: The primary core also adopts the same four-barrel structure as the secondary core, increasing the single primary winding to three primary windings, which are placed in the three winding slots between the four barrels. The primary and secondary iron cores are placed side by side in an adjacent structure, and the rotating shaft is passed through the shaft holes of the primary and secondary iron cores to form the ninth type of three-frequency resonant three-phase rotary transformer with both primary and secondary windings being three-phase.

10. The three-frequency resonant three-phase rotary transformer according to claim 5, characterized in that: The primary winding slot of the primary core is increased to three primary winding slots, and the single primary winding is changed to three primary windings, which are placed in the three primary winding slots respectively. This forms a nested structure with the primary core and three primary windings on the outside and the rotatable secondary core and three secondary windings on the inside, forming the tenth type of three-frequency resonant three-phase rotary transformer with both primary and secondary windings being three-phase.

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