Brushless doubly-fed machine port motor with double-sided excitation and additional magnetic field modulation type emphasis magnetic effect

Abstract

The application provides a double-sided excitation additional magnetic field modulation type brushless double electromechanical port motor with emphasized magnetic effect, which comprises a split tooth stator, an outer rotor and an inner rotor coaxially and nested from outside to inside in a radial direction, and the outer rotor and the inner rotor are independently assembled with mechanical rotating shafts; the split tooth stator comprises a plurality of stator modulation teeth uniformly arranged in a circumferential direction, and a stator built-in permanent magnet, a first modulation winding and a second modulation winding which are electrically isolated from each other are arranged in the stator slot; the stator built-in permanent magnet serves as a stator side edge excitation source, and the first modulation winding and the second modulation winding constitute double independent electrical ports; the outer rotor comprises outer rotor tangential magnetized permanent magnets and outer rotor silicon steel magnetism adjusting blocks which are alternately arranged in the circumferential direction; and the inner rotor adopts a passive magnetic guide modulation structure. The application builds a multi-magnetic circuit cooperative enhancement mechanism with additional magnetic flux modulation, improves effective working harmonic content and air gap magnetic field utilization rate, and realizes the emphasized magnetic effect of the novel brushless double electromechanical port motor.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a dual-excitation, additional magnetic field modulation type brushless dual-electromechanical-port motor that emphasizes magnetic effect. Background Technology

[0002] With the development of new energy vehicles, renewable energy power generation, and intelligent power transmission systems, higher demands are being placed on independent power transmission and electromechanical energy conversion between dual mechanical ports. Traditional mechanical gear transmission methods suffer from problems such as mechanical contact wear, noise and vibration, and high maintenance costs, making it difficult to meet the requirements of high reliability and low maintenance applications. The brushless dual electromechanical port motor utilizes the principle of magnetic field modulation to achieve non-contact power transmission between the mechanical and electrical ports through spatial harmonic coupling, providing a new technical solution to replace traditional mechanical power shunt mechanisms.

[0003] Existing brushless dual-electromechanical-port motors typically employ a combination of external rotor permanent magnet excitation and magnetic field modulation. This magnetic field modulation converts non-working space harmonics in the permanent magnet field into working harmonics that match the pole pair number of the modulation winding, thus achieving energy conversion between the dual mechanical ports and dual electrical ports. However, the effective working harmonics in existing structures mainly originate from limited magnetic field modulation paths, resulting in a relatively singular magnetic field source. This limits the amplitude of the effective working harmonics, restricting further improvements in the motor's torque density and power density.

[0004] To improve the performance of field-modulated motors, existing research mainly focuses on enhancing the air gap magnetic field by optimizing the magnetic pole matching relationship, increasing the number of field modulation units, or improving the permanent magnet structure. However, these methods primarily optimize a single excitation source and do not fully utilize the synergistic effect between different excitation sources. Furthermore, the internal rotor of traditional dual-electromechanical-port motors typically employs a permanent magnet structure, which is prone to generating significant permanent magnet eddy current losses during high-speed operation. Summary of the Invention

[0005] Based on this, the present invention provides a dual-excitation additional magnetic field modulation type brushless dual electromechanical port motor that emphasizes magnetic effect, so as to construct a multi-magnetic circuit synergistic enhancement mechanism, improve the effective working harmonic content and air gap magnetic field utilization rate.

[0006] A dual-excitation, additional magnetic field modulation type brushless dual-electromechanical-port motor emphasizing magnetic effect. It includes a split-tooth stator, an outer rotor, and an inner rotor arranged coaxially from the outside to the inside along the radial direction. The outer rotor and the inner rotor are each independently equipped with a mechanical shaft to form two independent mechanical power ports, realizing non-contact energy transfer between the two mechanical power ports. The outer rotor and the inner rotor achieve power transfer through air gap magnetic field modulation. The split-tooth stator includes a number of stator modulation teeth evenly arranged circumferentially. The stator slot is provided with a stator built-in permanent magnet and a first modulation winding and a second modulation winding that are electrically isolated from each other. The stator built-in permanent magnet serves as the stator side excitation source. The number of pole pairs of the stator built-in permanent magnet is equal to the total number of stator modulation teeth. The stator built-in permanent magnet is radially magnetized. The first modulation winding and the second modulation winding constitute dual independent electrical ports. The outer rotor has both excitation and modulation functions. It includes an outer rotor tangentially magnetized permanent magnet and an outer rotor silicon steel magnetizing block arranged alternately along the circumference. The outer rotor tangentially magnetized permanent magnet serves as the side excitation source of the outer rotor, and the outer rotor silicon steel magnetizing block is used for magnetic flux conduction and magnetic field modulation. The inner rotor adopts a passive magnetic permeation modulation structure, which is integrally stacked and formed from silicon steel sheets, and only silicon steel modulation teeth are set in the inner rotor. The motor has three independent magnetic field modulation paths: a fundamental magnetic field modulation path, a higher harmonic magnetic field modulation path, and an additional magnetic field modulation path. The fundamental magnetic field modulation path is formed by the outer rotor tangentially magnetized permanent magnet, the stator modulation teeth, and the second modulation winding. The higher harmonic magnetic field modulation path is formed by the outer rotor tangentially magnetized permanent magnet, the inner rotor silicon steel modulation teeth, and the first modulation winding. The additional magnetic field modulation path is formed by the stator built-in permanent magnet, the outer rotor silicon steel magnetic adjustment block, and the first modulation winding. The working harmonics generated by the above three independent magnetic field modulation paths work together to achieve multi-magnetic-circuit harmonic enhancement.

[0007] The aforementioned bilaterally excitation additional magnetic field modulation type brushless dual-electromechanical-port motor with emphasized magnetic effect, wherein, for the fundamental magnetic field modulation path, the fundamental excitation magnetic field generated by the tangentially magnetized permanent magnet of the outer rotor, after being modulated by the stator modulation teeth, forms a working harmonic that matches the number of pole pairs of the second modulation winding, thereby realizing the electromagnetic coupling between the outer rotor and the second modulation winding. The motor satisfies the following equation:

[0008] in, This represents the number of pole pairs in the second modulation winding. The number of pole pairs of the tangentially magnetized permanent magnets of the outer rotor. The number of stator modulation teeth; For the high-order harmonic magnetic field modulation path, the spatial high-order harmonic magnetic field generated by the tangentially magnetized permanent magnet of the outer rotor is modulated by the silicon steel modulation teeth of the inner rotor to form a working harmonic that matches the number of pole pairs of the first modulation winding. The motor satisfies the following formula:

[0009] in, The number of pole pairs of the first modulation winding. ,and and Coprime numbers The harmonic order of the external rotor permanent magnet space is... The number of silicon steel modulation teeth for the inner rotor; For the additional magnetic field modulation path, the fixed excitation magnetic field generated by the stator's built-in permanent magnet is modulated by the silicon steel magnet adjusting block of the outer rotor to form a rotating working harmonic that matches the number of pole pairs of the first modulation winding. The motor satisfies the following formula:

[0010] in, This represents the number of pole pairs of the permanent magnets built into the stator. This refers to the total number of silicon steel magnetic adjustment blocks for the external rotor.

[0011] A dual-excitation, additional magnetic field modulation type brushless dual-electromechanical-port motor emphasizing magnetic effects, wherein the motor satisfies the following formula: .

[0012] in, The number of pole pairs of the tangentially magnetized permanent magnets of the outer rotor. This refers to the total number of silicon steel magnetic adjustment blocks for the external rotor.

[0013] The aforementioned bilaterally excitation additional magnetic field modulation type brushless dual-electromechanical-port motor emphasizing magnetic effect satisfies the following formula:

[0014]

[0015] in, The frequency of the current in the first modulation winding is [frequency value]. The external rotor's mechanical speed. The internal rotor's mechanical speed. The frequency of the current in the second modulation winding is denoted as .

[0016] The aforementioned dual-excitation additional magnetic field modulation type brushless dual-electromechanical-port motor with emphasis on magnetic effect has the first modulation winding and the second modulation winding being independent m-phase windings, where m≥3; the two sets of modulation windings are spatially isolated in the stator slots, and the ends of each phase winding are independently led out and connected to independent power converters to achieve dual-port electrical isolation.

[0017] The aforementioned bilateral excitation additional magnetic field modulation type brushless dual electromechanical port motor with emphasis on magnetic effect has the same number of pole pairs for the working harmonics generated by the additional magnetic field modulation path and the working harmonics generated by the higher harmonic magnetic field modulation path. By adjusting the stator built-in permanent magnet and the outer rotor tangentially magnetized permanent magnet, the two working harmonics meet the phase matching condition. The two working harmonics are superimposed in phase in the corresponding region of the first modulation winding, thereby increasing the effective flux linkage amplitude and realizing multi-magnetic-path harmonic enhancement.

[0018] The aforementioned dual-excitation additional magnetic field modulation type brushless dual electromechanical port motor with emphasized magnetic effect, wherein the stator-side excitation source is used to generate a fixed spatial magnetomotive force, and the outer rotor-side excitation source is used to generate a rotating spatial magnetomotive force.

[0019] The aforementioned bilateral excitation additional magnetic field modulation type brushless dual electromechanical port motor with emphasis on magnetic effect has the N pole of the stator built-in permanent magnet facing the outer rotor and the S pole facing the stator, so that the stator built-in permanent magnet generates magnetomotive force, which serves as the excitation source for the additional magnetic field modulation path.

[0020] The dual-excitation additional magnetic field modulation type brushless dual-electromechanical-port motor emphasizing magnetic effect provided by the present invention has the following beneficial effects: (1) By introducing a stator-side excitation source, the present invention constructs an additional magnetic field modulation path, which expands the traditional dual-electromechanical port motor from two types of magnetic field modulation to three types of magnetic field modulation, namely the fundamental magnetic field modulation path, the higher harmonic magnetic field modulation path and the additional magnetic field modulation path. The working harmonics generated by the three independent magnetic field modulation paths work together to achieve multi-magnetic-circuit harmonic enhancement. While maintaining the non-contact power transmission advantage of the brushless dual-electromechanical port motor, it realizes the multi-magnetic-circuit collaborative enhancement mechanism, which improves the effective working harmonic content and the air gap magnetic field utilization rate.

[0021] (2) The present invention utilizes the additional magnetic field modulation path and the higher harmonic magnetic field modulation path to generate the same-pole working harmonics, and achieves magnetic field superposition through phase matching, thereby improving the effective flux linkage amplitude of the first modulation winding.

[0022] (3) In this invention, the stator built-in permanent magnet is used as the stator side excitation source to generate a fixed spatial magnetomotive force, and the outer rotor tangentially magnetized permanent magnet is used as the outer rotor side excitation source to generate a rotating spatial magnetomotive force. This realizes a double-sided excitation structure, further improving the air gap magnetic field strength. At the same time, the use of an inner rotor structure without permanent magnets reduces the amount of permanent magnet material used and the loss during high-speed operation.

[0023] (4) The present invention integrates dual mechanical ports and dual electrical ports, and can be applied to dual-port energy conversion equipment such as power splitting systems for hybrid vehicles, wind power generation, tidal power generation and underwater propulsion, with a wider range of applications. Attached Figure Description

[0024] Figure 1 This is a front view schematic diagram of the dual-excitation additional magnetic field modulation type brushless dual electromechanical port motor with emphasized magnetic effect in an embodiment of the present invention; Figure 2 This is a three-dimensional overall assembly schematic diagram of a dual-excitation additional magnetic field modulation type brushless dual electromechanical port motor emphasizing magnetic effect in an embodiment of the present invention. Figure 3 This is a partial annular cross-sectional view of the brushless dual-electromechanical-port motor with bilateral excitation and additional magnetic field modulation, which emphasizes magnetic effect, in an embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of a split-tooth stator; Figure 5 A schematic diagram of the structure of the stator with built-in permanent magnet, first modulation winding and second modulation winding; Figure 6 A schematic diagram of the exploded disassembly structure of the stator's built-in permanent magnet; Figure 7 This is a three-dimensional structural diagram of the external rotor; Figure 8 This is a three-dimensional structural diagram of the inner rotor; Figure 9 A schematic diagram showing the arrangement and magnetization direction of the permanent magnets built into the stator; Figure 10 This is a schematic diagram showing the arrangement and magnetization direction of the tangentially magnetized permanent magnets on the outer rotor. Figure 11 This is a comparison diagram of the stator-outer rotor air gap radial magnetic flux density of the present invention and that of a conventional dual electromechanical port motor; Figure 12 This is a comparison diagram of the radial magnetic flux density of the air gap between the outer rotor and the inner rotor of the present invention and a conventional dual-electromechanical-port motor; Figure 13 This is a comparison diagram of the spatial harmonic Fourier analysis of the stator-outer rotor air gap magnetic flux density of the present invention and that of a conventional dual-electromechanical-port motor. Figure 14 This is a comparison chart of the spatial harmonic Fourier analysis of the air gap magnetic flux density of the external rotor-inner rotor of the present invention and that of the traditional dual-electromechanical-port motor. Detailed Implementation

[0025] To facilitate understanding of the present invention, a more complete description will be given below with reference to various embodiments. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] Please see Figures 1 to 10The present invention provides a dual-excitation additional magnetic field modulation type brushless dual electromechanical port motor with emphasis on magnetic effect, including a split tooth stator 1, an outer rotor 5, and an inner rotor 6 arranged coaxially from the outside to the inside in the radial direction.

[0028] The split-tooth stator 1 is fixedly installed inside the motor housing and serves as a static magnetic field modulation component for the motor.

[0029] The outer rotor 5 and inner rotor 6 are each independently equipped with a mechanical shaft to form two independent mechanical power ports, enabling non-contact energy transfer between the two mechanical power ports. There is no rigid mechanical connection between the outer rotor 5 and the inner rotor 6; non-contact power transfer is achieved between the two mechanical ports through air gap magnetic field modulation, thereby enabling independent adjustment of speed and torque between the two mechanical ports.

[0030] The split-tooth stator 1 includes a number of stator modulation teeth 7 evenly arranged circumferentially. Each stator modulation tooth 7 participates in the air gap magnetic field modulation as an independent magnetic permeability modulation structure. Stator slots are formed between adjacent stator modulation teeth 7. Stator slots are equipped with stator built-in permanent magnets 4, as well as a first modulation winding 2 and a second modulation winding 3 that are electrically isolated from each other.

[0031] Please refer to this carefully. Figure 9 , Figure 9 The arrows indicate the magnetization direction of the permanent magnets. The stator-embedded permanent magnet 4 is radially magnetized, with its N pole facing the outer rotor 5 and its S pole facing the stator, generating a magnetomotive force that serves as the excitation source for the additional magnetic field modulation path. The first modulation winding 2 and the second modulation winding 3 constitute dual independent electrical ports.

[0032] The stator built-in permanent magnet 4 serves as the stator side excitation source. The number of pole pairs of the stator built-in permanent magnet is equal to the total number of stator modulation teeth, so that the stator side excitation magnetic field is evenly distributed in the outer air gap, and an effective working harmonic is formed through subsequent magnetic field modulation.

[0033] Specifically, both the first modulation winding 2 and the second modulation winding 3 are independent m-phase windings, where m ≥ 3. The second modulation winding 3 is used to receive the operating harmonics generated by the fundamental magnetic field modulation path. The first modulation winding 2 is used to simultaneously receive the operating harmonics generated by the higher-order harmonic magnetic field modulation path and the additional magnetic field modulation path. The two sets of modulation windings are spatially isolated in the stator slots, and the ends of each phase winding are independently led out and connected to independent power converters to achieve dual-port electrical isolation.

[0034] The outer rotor 5 has both excitation and modulation functions. It includes tangentially magnetized permanent magnets 5-1 arranged alternately along the circumference and silicon steel magnet adjusting blocks 5-2. Please refer to the following for details. Figure 10 , Figure 10The arrows indicate the magnetization direction of the permanent magnets. The tangentially magnetized permanent magnet 5-1 of the outer rotor serves as the side excitation source for the outer rotor, while the silicon steel magnet adjusting block 5-2 of the outer rotor is used for magnetic flux conduction and magnetic field modulation. Together, the tangentially magnetized permanent magnet 5-1 and the silicon steel magnet adjusting block 5-2 of the outer rotor constitute an integrated excitation and modulation outer rotor structure. The silicon steel magnet adjusting block 5-2 of the outer rotor is made of high-permeability silicon steel, enabling the outer rotor to simultaneously possess excitation and magnetic field modulation functions. Compared to the traditional design where the permanent magnet excitation structure and modulation structure are separated in magnetic field modulation motors, this invention utilizes the outer rotor to simultaneously complete excitation and modulation, improving the utilization efficiency of the permanent magnet magnetic field and providing a magnetic flux modulation basis for multi-magnetic-circuit magnetic field modulation.

[0035] In this embodiment, the stator-side excitation source is used to generate a fixed spatial magnetomotive force, and the outer rotor-side excitation source is used to generate a rotating spatial magnetomotive force. The two side excitation sources participate in different magnetic field modulation processes, jointly establishing the motor's working magnetic field. By combining stator-side excitation and outer rotor-side excitation, multiple flux sources form independent closed flux paths through corresponding modulation structures, constituting the multi-path magnetic field modulation of this invention. The fixed excitation magnetic field generated by the stator's built-in permanent magnet 4 is modulated by the outer rotor's silicon steel tuning block 5-2, forming a rotating working harmonic that matches the number of pole pairs of the first modulation winding 2. This allows the first modulation winding 2 to obtain an effective flux linkage generated by additional magnetic field modulation on top of traditional high-order harmonic magnetic field modulation.

[0036] The inner rotor 6 adopts a passive magnetic modulation structure, integrally laminated from silicon steel sheets. It does not contain permanent magnets or excitation windings, but only silicon steel modulation teeth. These teeth modulate the spatial high-order harmonic magnetic field of the tangentially magnetized permanent magnet 5-1 of the outer rotor, matching the effective operating harmonics with the first modulation winding 2. Simultaneously, because the inner rotor lacks a permanent magnet structure, permanent magnet eddy current losses during high-speed rotation are reduced, improving operational reliability.

[0037] This invention comprises multiple magnetic flux transmission paths formed by the combined action of a stator-side excitation source, an external rotor-side excitation source, and different magnetic field modulation structures. Each magnetic circuit has a corresponding excitation source, magnetic field modulation structure, and working harmonic formation mechanism, and ultimately achieves electromagnetic coupling through modulation windings, thereby improving the utilization rate of the effective working magnetic field.

[0038] Specifically, the present invention utilizes multiple closed magnetic flux paths formed by the stator built-in permanent magnet 4, the outer rotor tangentially magnetized permanent magnet 5-1, the stator modulation teeth 7, the outer rotor silicon steel magnetic adjustment block 5-2, and the inner rotor silicon steel modulation teeth to enable the motor to form three independent magnetic field modulation paths: 1) The first path is the fundamental magnetic field modulation path. The fundamental magnetic field generated by the tangentially magnetized permanent magnet 5-1 of the outer rotor passes through the outer radial air gap, is modulated by the stator modulation teeth 7, and then coupled with the second modulation winding 3 to form a rotating working harmonic that matches the number of pole pairs of the second modulation winding 3, thereby realizing the energy conversion between the mechanical port and the electrical port of the outer rotor.

[0039] 2) The second path is the high-order harmonic magnetic field modulation path. The high-order harmonic magnetic field generated by the outer rotor tangential magnetized permanent magnet 5-1 enters the inner rotor 6 through the outer radial air gap. It is subjected to the periodic magnetic permeation modulation effect generated by the silicon steel modulation teeth of the inner rotor. The modulated magnetic field enters the split tooth stator 1 through the inner radial air gap, and then electromagnetically couples with the first modulation winding 2 to form a closed magnetic flux path.

[0040] 3) The third path is the additional magnetic field modulation path. The fixed additional magnetic field generated by the stator built-in permanent magnet 4 enters the outer radial air gap through the stator modulation teeth 7, and is further modulated by the outer rotor silicon steel magnetic adjustment block 5-2, so that the fixed magnetic field is converted into a rotating working harmonic. This harmonic is coupled with the first modulation winding 2, thereby adding a new effective magnetic field source on the basis of traditional high-order harmonic magnetic field modulation.

[0041] The core enhancement mechanism of this invention lies in the fact that the operating harmonics generated by the additional magnetic field modulation path and the operating harmonics generated by the higher harmonic magnetic field modulation path have the same number of pole pairs. , which is also the number of pole pairs of the first modulation winding 2.

[0042] The working harmonics generated by the three independent magnetic field modulation paths mentioned above work together to achieve multi-magnetic-circuit harmonic enhancement.

[0043] In addition, by adjusting the spatial installation positions of the stator built-in permanent magnet 4 and the outer rotor tangentially magnetized permanent magnet 5-1, the two working harmonics meet the phase matching conditions, thereby achieving in-phase superposition in the magnetic field region corresponding to the first modulation winding 2 and improving the effective flux linkage amplitude.

[0044] Specifically, the motor satisfies the following formula:

[0045] in, The number of pole pairs for the tangentially magnetized permanent magnet 5-1 of the outer rotor. This refers to the total number of silicon steel adjusting blocks 5-2 for the outer rotor.

[0046] The motor also satisfies the following formula:

[0047]

[0048]

[0049] in, The number of pole pairs of the first modulation winding 2. This represents the number of pole pairs in the second modulation winding 3. ,and and Coprime numbers The number of stator modulation teeth 7. The number of silicon steel modulation teeth for the inner rotor. The harmonic order of the external rotor permanent magnet space is... denoted as the number of pole pairs of the stator's built-in permanent magnet 4.

[0050] Specifically, the fundamental magnetic field modulation path satisfies: In the outer rotor The excitation magnetomotive force generated by the permanent magnet is After modulation by the stator modulation teeth, the following is generated The rotating working harmonic of the opposite pole is coupled with the second modulation winding 3; The higher harmonic magnetic field modulation path satisfies: In the outer rotor permanent magnets The odd harmonic magnetomotive force passes through the inner rotor. After modulation by a silicon steel modulation tooth, it produces The rotating working harmonic of the opposite pole is coupled with the first modulation winding 2.

[0051] The additional magnetic field modulation path satisfies: stator built-in The static excitation magnetomotive force generated by the permanent magnet is transmitted through the outer rotor. After modulation by a silicon steel magnetic block, it produces The rotating working harmonic of the opposite pole is coupled with the first modulation winding 2.

[0052] As a specific embodiment, select Take 7. Take 4. Take 11, Take 18, Take 29, Take 22, Take 18, We take 3. Thus, the fundamental modulation path generates 7 pairs of working harmonics, while the higher harmonic modulation path and the additional magnetic field modulation path each generate 4 pairs of working harmonics. The two working harmonics satisfy the superposition condition of the same pole.

[0053] This invention establishes independent electromagnetic frequency matching relationships through two sets of modulation windings, enabling independent adjustment of speed and torque at dual mechanical ports. Specifically, the first modulation winding 2 generates... A polar rotating magnetic field has a frequency that satisfies:

[0054] in, The frequency of the current in the first modulation winding 2 is... The external rotor's mechanical speed. The mechanical speed of the inner rotor is denoted as 6. The speed of the mechanical port of the inner rotor 6 can be adjusted by regulating the current frequency of the first modulation winding 2; the output torque of the inner rotor can be controlled by adjusting the amplitude of the winding current.

[0055] The second modulation winding 3 generates A polar rotating magnetic field has a frequency that satisfies:

[0056] in, The current frequency of the second modulation winding 3 is denoted as . The armature magnetic field generated by the second modulation winding 3, together with the excitation magnetic field generated by the tangentially magnetized permanent magnet 5-1 of the outer rotor and the stator modulation teeth 7, achieves energy conversion between the mechanical and electrical ports of the outer rotor.

[0057] The operating speed of the external rotor mechanical port can be adjusted by regulating the current frequency of the second modulation winding 3; the output torque of the external rotor can be controlled by adjusting the current amplitude of the winding. Since the first modulation winding 2 and the second modulation winding 3 correspond to different magnetic field modulation paths, the two electrical ports have independent control capabilities.

[0058] This invention employs a dual-excitation structure with both the stator's built-in permanent magnet 4 and the outer rotor's tangentially magnetized permanent magnet 5-1 providing simultaneous excitation. The two excitation sources on either side participate in different magnetic field modulation processes, enhancing the air gap magnetomotive force while increasing the number of effective working harmonics. Furthermore, the outer rotor 5 of this invention utilizes an integrated structure of the outer rotor's tangentially magnetized permanent magnet 5-1 and the outer rotor's silicon steel magnetizing block 5-2, allowing the same outer rotor excitation source to simultaneously participate in stator modulation and inner rotor modulation, thereby improving magnetic field utilization efficiency.

[0059] To verify the effect of this invention on enhancing the air gap magnetic field, the motor of this invention was compared and analyzed with a traditional brushless dual-electromechanical-port motor. Figure 11 and Figure 12 Radial air gap magnetic flux density distribution curves for two types of motors at different air gap locations are presented. Figure 11 The results show the comparison of magnetic flux density in the air gap region between the stator and the outer rotor. Figure 12 The results show the magnetic flux density comparison in the air gap region between the outer rotor and the inner rotor.

[0060] Depend on Figure 11As can be seen, compared with traditional dual-port motors, this invention, by adding a stator-side excitation source generated by the stator-embedded permanent magnet 4 and using the silicon steel magnet modulating block 5-2 on the outer rotor to modulate the stator excitation magnetic field, provides a richer source of magnetic field modulation in the stator-outer rotor air gap region, significantly improving the air gap magnetic flux density amplitude. Simultaneously, the combined effect of the outer rotor-side excitation magnetic field and the stator-side excitation magnetic field enhances the air gap magnetic field strength, improving the effective magnetic field utilization rate of the motor.

[0061] Depend on Figure 12 As can be seen, in the air gap region between the outer rotor and the inner rotor, this invention utilizes the silicon steel modulation teeth of the inner rotor to further modulate the harmonic magnetic field generated by the tangentially magnetized permanent magnet 5-1 of the outer rotor, effectively converting harmonics that were originally difficult to utilize directly, and forming a working magnetic field that matches the first modulation winding 2. Compared with the traditional structure, this invention obtains a higher amplitude effective air gap magnetic flux density in the coupling region between the inner and outer rotors, which is beneficial to improving the flux linkage of the first modulation winding.

[0062] To further analyze the spatial harmonic characteristics in the air gap magnetic field of this invention, Figure 11 and Figure 12 The air gap magnetic flux density distribution shown is subjected to Fourier decomposition to obtain... Figure 13 and Figure 14 The spatial harmonic analysis results are shown. Among them, Figure 13 The results are from the Fourier analysis of the air gap magnetic flux density between the stator and the outer rotor. Figure 14 The results are Fourier analysis of the air gap magnetic flux density between the outer rotor and the inner rotor.

[0063] Depend on Figure 13 It can be seen that, compared with traditional brushless dual-electromechanical-port motors, the effective spatial harmonic amplitude in the stator-outer rotor air gap of this invention is significantly enhanced. This is mainly because, based on the traditional external rotor excitation modulation, this invention introduces an additional excitation magnetic field generated by the stator's built-in permanent magnet 4, and forms an additional magnetic field modulation path through the silicon steel adjusting block 5-2 of the external rotor, thus providing a new magnetic field source for the original magnetic field modulation. Therefore, the combined effect of multiple magnetic circuits increases the spatial harmonic intensity in the air gap, providing a higher amplitude effective working magnetic field for the second modulation winding 3.

[0064] Depend on Figure 14 As can be seen, in the air gap region between the outer rotor and the inner rotor, this invention modulates the harmonic magnetic field generated by the tangentially magnetized permanent magnet 5-1 of the outer rotor through the silicon steel modulation teeth of the inner rotor, so that the effective harmonic components in the excitation magnetic field of the outer rotor are fully utilized. Compared with the traditional structure, this invention can enhance the effective modulation harmonic amplitude in the coupling region between the inner and outer rotors and improve the flux linkage capability of the region corresponding to the first modulation winding 2.

[0065] Since the first modulation winding 2 and the second modulation winding 3 correspond to different magnetic field modulation paths, and the outer rotor and inner rotor are respectively connected to independent mechanical shafts, this invention can realize independent energy conversion between dual mechanical ports and dual electrical ports. This structure can be applied to power split systems for hybrid vehicles, wind power generation equipment, tidal power generation devices, underwater propulsion systems, and other equipment requiring dual-port power transmission and regulation.

[0066] In summary, the dual-excitation additional magnetic field modulation type brushless dual-electromechanical-port motor emphasizing magnetic effect provided by the present invention has the following beneficial effects: (1) By introducing a stator-side excitation source, the present invention constructs an additional magnetic field modulation path, which expands the traditional dual-electromechanical port motor from two types of magnetic field modulation to three types of magnetic field modulation, namely the fundamental magnetic field modulation path, the higher harmonic magnetic field modulation path and the additional magnetic field modulation path. The working harmonics generated by the three independent magnetic field modulation paths work together to achieve multi-magnetic-circuit harmonic enhancement. While maintaining the non-contact power transmission advantage of the brushless dual-electromechanical port motor, it realizes the multi-magnetic-circuit collaborative enhancement mechanism, which improves the effective working harmonic content and the air gap magnetic field utilization rate.

[0067] (2) The present invention utilizes the additional magnetic field modulation path and the higher harmonic magnetic field modulation path to generate the same-pole working harmonics, and achieves magnetic field superposition through phase matching, thereby improving the effective flux linkage amplitude of the first modulation winding.

[0068] (3) In this invention, the stator built-in permanent magnet is used as the stator side excitation source to generate a fixed spatial magnetomotive force, and the outer rotor tangentially magnetized permanent magnet is used as the outer rotor side excitation source to generate a rotating spatial magnetomotive force, thus realizing a double-sided excitation structure, further improving the air gap magnetic field strength. At the same time, the use of an inner rotor structure without permanent magnets reduces the amount of permanent magnet material used and the loss during high-speed operation.

[0069] (4) The present invention integrates dual mechanical ports and dual electrical ports, and can be applied to dual-port energy conversion equipment such as power splitting systems for hybrid vehicles, wind power generation, tidal power generation and underwater propulsion, with a wider range of applications.

Claims

1. A dual-excitation, additional magnetic field modulation type brushless dual-electromechanical-port motor emphasizing magnetic effect, characterized in that, It includes a split-tooth stator, an outer rotor, and an inner rotor arranged coaxially from the outside to the inside along the radial direction. The outer rotor and the inner rotor are each independently equipped with a mechanical shaft to form two independent mechanical power ports, realizing non-contact energy transfer between the two mechanical power ports. The outer rotor and the inner rotor achieve power transfer through air gap magnetic field modulation. The split-tooth stator includes a number of stator modulation teeth evenly arranged circumferentially. The stator slot is provided with a stator built-in permanent magnet and a first modulation winding and a second modulation winding that are electrically isolated from each other. The stator built-in permanent magnet serves as the stator side excitation source. The number of pole pairs of the stator built-in permanent magnet is equal to the total number of stator modulation teeth. The stator built-in permanent magnet is radially magnetized. The first modulation winding and the second modulation winding constitute dual independent electrical ports. The outer rotor has both excitation and modulation functions. It includes an outer rotor tangentially magnetized permanent magnet and an outer rotor silicon steel magnetizing block arranged alternately along the circumference. The outer rotor tangentially magnetized permanent magnet serves as the side excitation source of the outer rotor, and the outer rotor silicon steel magnetizing block is used for magnetic flux conduction and magnetic field modulation. The inner rotor adopts a passive magnetic permeation modulation structure, which is integrally stacked and formed from silicon steel sheets, and only silicon steel modulation teeth are set in the inner rotor. The motor has three independent magnetic field modulation paths, namely the fundamental magnetic field modulation path, the higher harmonic magnetic field modulation path, and the additional magnetic field modulation path. The fundamental magnetic field modulation path is formed by the outer rotor tangentially magnetized permanent magnet, the stator modulation teeth, and the second modulation winding; the higher harmonic magnetic field modulation path is formed by the outer rotor tangentially magnetized permanent magnet, the inner rotor silicon steel modulation teeth, and the first modulation winding; the additional magnetic field modulation path is formed by the stator built-in permanent magnet, the outer rotor silicon steel magnetic adjustment block, and the first modulation winding; the working harmonics generated by the above three independent magnetic field modulation paths work together to achieve multi-magnetic-circuit harmonic enhancement.

2. The dual-excitation additional magnetic field modulation type brushless dual-electromechanical-port motor emphasizing magnetic effect according to claim 1, characterized in that, For the fundamental magnetic field modulation path, the fundamental excitation magnetic field generated by the tangentially magnetized permanent magnet of the outer rotor is modulated by the stator modulation teeth to form a working harmonic that matches the number of pole pairs of the second modulation winding, thereby realizing the electromagnetic coupling between the outer rotor and the second modulation winding. The motor satisfies the following equation: in, This represents the number of pole pairs in the second modulation winding. The number of pole pairs of the tangentially magnetized permanent magnets of the outer rotor. The number of stator modulation teeth; For the high-order harmonic magnetic field modulation path, the spatial high-order harmonic magnetic field generated by the tangentially magnetized permanent magnet of the outer rotor is modulated by the silicon steel modulation teeth of the inner rotor to form a working harmonic that matches the number of pole pairs of the first modulation winding. The motor satisfies the following formula: in, The number of pole pairs of the first modulation winding. ,and and Coprime numbers The harmonic order of the external rotor permanent magnet space is... The number of silicon steel modulation teeth for the inner rotor; For the additional magnetic field modulation path, the fixed excitation magnetic field generated by the stator's built-in permanent magnet is modulated by the silicon steel magnet adjusting block of the outer rotor to form a rotating working harmonic that matches the number of pole pairs of the first modulation winding. The motor satisfies the following formula: in, This refers to the number of pole pairs of the permanent magnets built into the stator. This refers to the total number of silicon steel magnetic adjustment blocks for the external rotor.

3. The bilateral excitation additional magnetic field modulation type brushless dual electromechanical port motor emphasizing magnetic effect according to claim 2, characterized in that, The motor satisfies the following formula: 。 4. The dual-excitation additional magnetic field modulation type brushless dual-electromechanical-port motor emphasizing magnetic effect according to claim 3, characterized in that, The motor satisfies the following formula: in, The frequency of the current in the first modulation winding is [frequency value]. The external rotor's mechanical speed. The internal rotor's mechanical speed. The frequency of the current in the second modulation winding is denoted as .

5. The dual-excitation, additional magnetic field modulation type brushless dual-electromechanical-port motor emphasizing magnetic effect according to claim 1, characterized in that, The first and second modulation windings are both independent m-phase windings, where m ≥ 3; the two sets of modulation windings are arranged in spatial isolation within the stator slots, and the ends of each phase winding are independently led out and connected to independent power converters to achieve dual-port electrical isolation.

6. The dual-excitation, additional magnetic field modulation type brushless dual-electromechanical-port motor emphasizing magnetic effect according to claim 1, characterized in that, The working harmonics generated by the additional magnetic field modulation path and the working harmonics generated by the higher harmonic magnetic field modulation path have the same number of pole pairs. By adjusting the stator built-in permanent magnet and the outer rotor tangentially magnetized permanent magnet, the two working harmonics can meet the phase matching condition. The two working harmonics are superimposed in phase in the corresponding region of the first modulation winding, thereby increasing the effective flux linkage amplitude and realizing multi-circuit harmonic enhancement.

7. The dual-excitation additional magnetic field modulation type brushless dual-electromechanical-port motor emphasizing magnetic effect according to claim 1, characterized in that, The stator-side excitation source is used to generate a fixed spatial magnetomotive force, and the outer rotor-side excitation source is used to generate a rotating spatial magnetomotive force.

8. The dual-excitation, additional magnetic field modulation type brushless dual-electromechanical-port motor emphasizing magnetic effect according to claim 1, characterized in that, The N pole of the stator's built-in permanent magnet faces the outer rotor, and the S pole faces the stator, causing the built-in permanent magnet to generate a magnetomotive force, which serves as the excitation source for the additional magnetic field modulation path.

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