A double-stator single-rotor yokeless radial structure, rotor ring and motor

Abstract

The application provides a double-stator single-rotor yoke-free radial structure, a rotor ring and a motor. The double-stator single-rotor yoke-free radial structure is arranged in a motor structure and comprises an inner stator ring, a rotor ring and an outer stator ring which are arranged from inside to outside, and the inner stator ring, the rotor ring and the outer stator ring are arranged along the radial plane. An end cover is connected and fixed with the axial surface of the rotor ring, and is used for driving the transmission shaft to rotate when the rotor ring rotates freely relative to the inner stator ring and the outer stator ring. The transmission shaft is used for being connected with an external rotatable structure. The rotor ring is connected and fixed by the end cover, the magnetic moment force on the inner side and the outer side of the rotor is conducted to the external transmission shaft without the support of the center hub iron core structure, the structural rigidity and strength under the condition of no center hub support are improved, and the motor structure integrity, the dynamic response speed and the operation efficiency of the motor under high speed of the rotor are ensured.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a dual-stator single-rotor yokeless radial structure, rotor ring, and motor. Background Technology

[0002] In the field of motor technology, with the increasing demands for power density, structural compactness and system integration, motor topology has gradually evolved from the traditional single stator and single rotor form to multi-stator or multi-rotor structures in order to make full use of internal space and improve electromagnetic performance.

[0003] The dual-stator single-rotor structure positions the rotor between inner and outer stators, with the teeth of both stators aligned along a straight line. Optimizing the number of teeth in the outer stator, the number of pole pairs in the coreless rotor, and the number of teeth in the inner stator achieves maximum torque and efficiency. Simultaneously, the two stators are aligned at an optimal angle, minimizing losses, cogging effects, and harmonic distortion. When used as a generator, it effectively ensures complete consistency in the voltage and phase sequence induced in both coil windings, with each stator contributing independently to the generator's output power, significantly improving the reliability and output consistency of the power generation system. It also boasts a compact structure and high magnetic field utilization. Similarly, when used as a motor, this structure significantly increases the total electrical load within the same volume, thereby greatly improving the motor's torque and power density. However, in a dual-stator single-rotor structure using a continuous iron core in a central hub as rotor support, the continuous magnetic core provides a common path for the magnetic flux of the inner and outer stators, leading to increased magnetic coupling effects. This, in turn, reduces core losses and rotor inertia, resulting in a decrease in the motor's dynamic response speed and operating efficiency.

[0004] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this invention is to provide a dual-stator single-rotor yokeless radial structure, rotor ring and motor, so as to solve the problems of redundant existing motor design structure, increased iron core loss and rotor rotational inertia caused by the use of central hub structure, and decreased dynamic response speed and operating efficiency of motor.

[0006] The technical solution of the present invention is as follows: This invention provides a dual-stator single-rotor yokeless radial structure, wherein the dual-stator single-rotor yokeless radial structure is disposed in a motor structure, comprising: The inner stator ring is fixedly installed near the center of the motor structure shaft. The rotor ring is sleeved on the side of the inner stator ring away from the motor shaft and is coplanar with the inner stator ring. There is an internal air gap between the rotor ring and the inner stator ring. An outer stator ring is sleeved on the radially outer side of the rotor ring, and the inner stator ring, rotor ring and outer stator ring are arranged coplanarly along the radial direction, with an external air gap between the outer stator ring and the rotor ring; The end cap is snapped and fixed to the axial surface of the rotor ring. The drive side of the end cap is fixedly connected to the drive shaft and is used to drive the drive shaft to rotate when the rotor ring rotates freely relative to the inner stator ring and the outer stator ring.

[0007] In a further embodiment of the present invention, the rotor ring includes a rotor sub-ring and a structural ridge; wherein, the rotor sub-ring is provided with a fixing hole; the structural ridge passes through the fixing hole and is connected to the end cap for fixing the rotor sub-ring to the end cap.

[0008] In a further embodiment of the present invention, the rotor rings are multiple and an odd number; each rotor ring has a fixing hole; the structural ridge passes through the fixing hole and is connected to the end cap, for fixing each rotor ring to the end cap respectively; the rotor rings are arranged parallel to each other along the axial direction. The rotor rings are arranged in a stepped manner. The rotor rings at the beginning and the rotor rings at the end are mirror-symmetrical about the plane containing the middle rotor ring. The adjacent rotor rings from the middle rotor ring to the beginning and the adjacent rotor rings from the middle rotor ring to the end are staggered by a first staggered angle in the same direction.

[0009] In a further embodiment of the present invention, the rotor ring includes: a rotor support and a magnet, the rotor support being fixedly connected to the structural ridge; the magnet is uniformly mounted on the rotor support along the circumferential direction of the rotor support and is connected to the end cap through the rotor support.

[0010] In a further embodiment of the present invention, the rotor support includes a plurality of magnet fixing components and non-magnetic filling structures evenly arranged circumferentially along the rotor rings. The magnet fixing components and the magnets are spaced apart. Each magnet fixing component has a snap-fit ​​groove at both ends and a fixing through hole. The snap-fit ​​groove is used to accommodate and snap the magnets, so that the magnets are spaced apart circumferentially along the rotor support. The non-magnetic filling structure is embedded in the fixing through hole and is used to fix the rotor support on the structural ridge.

[0011] In a further embodiment of the present invention, the non-magnetic filling structure has a filling adjustment slot, which is used to accommodate the structural ridge and adjust the relative position between the rotor ring and the structural ridge.

[0012] In a further embodiment of the present invention, the magnet fixing assembly is made of grain-oriented electrical steel by stamping or die casting, and the grain direction of the magnet fixing assembly is consistent with the direction of the maximum value of the rotor magnetic flux.

[0013] In a further embodiment of the present invention, the inner stator ring includes: an inner stator support and an inner stator winding; the inner stator support has winding teeth on a surface away from the axis, and the inner stator winding is wound on the winding teeth of the inner stator support, wherein the inner stator winding is a concentrated winding. The outer stator ring includes an outer stator support and an outer stator winding; the outer stator support has winding teeth on its surface near the shaft center, and the outer stator winding is wound on the winding teeth of the outer stator support, and the outer stator winding adopts a concentrated winding.

[0014] Based on the same inventive concept, the present invention also provides a rotor ring for the aforementioned dual-stator single-rotor yokeless radial structure.

[0015] Based on the same inventive concept, the present invention also provides an electric motor, which includes the rotor ring described above.

[0016] This invention provides a dual-stator single-rotor yokeless radial structure, a rotor ring, and a motor. The dual-stator single-rotor yokeless radial structure is disposed in the motor structure and includes: an inner stator ring, fixedly disposed near the motor structure axis; a rotor ring, sleeved on the side of the inner stator ring away from the motor axis and coplanar with the inner stator ring, with an internal air gap between the rotor ring and the inner stator ring; an outer stator ring, sleeved on the radially outer side of the rotor ring, with the inner stator ring, rotor ring, and outer stator ring being coplanar along the radial direction, and an external air gap between the outer stator ring and the rotor ring; and an end cap, which is snapped and fixed to the axial surface of the rotor ring, with the drive side of the end cap fixedly connected to a drive shaft for driving the drive shaft to rotate when the rotor ring rotates freely relative to the inner and outer stator rings. This invention connects and fixes the rotor ring through the end cap, and transmits the magnetic torque force on the inner and outer sides of the rotor to the external drive shaft in the absence of a central hub iron core support structure. This improves the structural rigidity and strength without central hub support, and ensures the structural integrity of the motor, the dynamic response speed of the motor, and the operating efficiency at high rotor speeds. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the dual-stator single-rotor yoke-free radial structure in a preferred embodiment of the present invention.

[0019] Figure 2 This is an unfolded diagram of the dual-stator single-rotor yoke-free radial structure in this invention.

[0020] Figure 3 This is a schematic diagram of the internal structure of the rotor ring in this invention.

[0021] Figure 4 This is a schematic diagram showing the position of a structural ridge magnet fixing component and a non-magnetic filling structure in this invention.

[0022] Figure 5 This is a schematic diagram of a rotor ring structure in this invention.

[0023] Figure 6 This is a schematic diagram of the structure when the filling adjustment groove is located in the second position on the non-magnetic filling structure in this invention.

[0024] Figure 7 This is a schematic diagram of the structure when the filling adjustment groove is located in the first position on the non-magnetic filling structure in this invention.

[0025] Figure 8 This is a schematic diagram of the structure when the filling adjustment groove is located at the third position on the non-magnetic filling structure in this invention.

[0026] The markings in the attached diagram are as follows: 100, inner stator ring; 110, inner stator support; 120, inner stator winding; 200, rotor ring; 201, fixing perforation; 210, rotor sub-ring; 211, rotor support; 2111, magnet fixing assembly; 21111, snap-fit ​​groove; 2112, non-magnetic filling structure; 21121, filling adjustment hole slot; 212, magnet; 220, structural ridge; 300, outer stator ring; 310, outer stator support; 320, outer stator winding; 400, end cover; 410, front end cover; 420, rear end cover; 500, winding tooth. Detailed Implementation

[0027] This invention provides a dual-stator, single-rotor yokeless radial structure, rotor ring, and motor. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0028] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of the present invention involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0029] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0030] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0031] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0032] The inventors discovered that conventional dual-stator single-rotor flux permanent magnet synchronous motors generally employ an axial configuration, utilizing a disc-shaped rotor and stator. Conventional axial flux motors are compact in structure and have a short axial dimension, typically less than half that of a conventional flux motor of the same power. Simultaneously, their torque and power density are significantly superior to traditional motors. Due to the larger rotor diameter, the torque density can reach up to four times that of a conventional motor of the same size, and the power density can be increased by two to three times when using a yokeless stator design. They offer greater manufacturing and design flexibility; the modular structure facilitates optimization of stator configuration, pole topology, and winding strategies for specific applications, such as integration into electric vehicle wheel hubs for precise torque vector control. However, the manufacturing process of this existing technology is complex, and the disc structure requires precise alignment; otherwise, uneven air gaps will lead to unbalanced magnetic pull, demanding extremely high precision. Furthermore, the wide-diameter rotor is prone to mechanical deformation under heavy loads or high speeds, resulting in decreased mechanical stress and making it unsuitable for high-speed applications.

[0033] It is evident that existing dual-stator single-rotor flux motor designs prioritize peak torque density or efficiency improvement, making it difficult to meet the stringent power-torque-weight ratio requirements of aerospace applications characterized by low speed, high torque, direct drive, and strict weight constraints. Furthermore, torque ripple and electromagnetic noise issues remain unresolved; existing axial flux motors still exhibit significant vibration and squealing at low speeds, failing to meet the aerospace application demands for high power density, high-efficiency direct drive, and low-speed, low-noise takeoff. Existing solutions introduce additional reinforcements due to insufficient stator structural rigidity, leading to a weight increase. Simultaneously, the power ratings of existing technologies are generally low; to increase power requirements, the total weight of the rotor and stator structures increases linearly with power, making it impossible to achieve high power density within a limited space. Therefore, current technology cannot achieve extremely high torque and power output, failing to meet the aerospace industry's power-torque-weight ratio requirements, especially for quiet takeoff in low-speed direct drive scenarios. Thus, a novel motor topology and structural design is urgently needed that can output high torque and power while maintaining extremely low overall weight and effectively suppress vibration and noise.

[0034] To solve the technical problems existing in the current technology, such as Figure 1As shown, the present invention provides a dual-stator single-rotor yokeless radial structure, which is disposed in a motor structure and includes: an inner stator ring 100, fixedly disposed near the axis of the motor structure; a rotor ring 200, sleeved on the side of the inner stator ring 100 away from the motor axis and coplanar with the inner stator ring 100, with an internal air gap between the rotor ring 200 and the inner stator ring 100; and an outer stator ring 300, sleeved radially outside the rotor ring 200, wherein the inner stator ring 100, rotor ring 200, and... The outer stator ring 300 is arranged coplanarly in the radial direction, and there is an external air gap between the outer stator ring 300 and the rotor ring 200; the end cover 400 has a disc-shaped surface on one side with the same outer diameter as the rotor ring 200, the disc-shaped surface is snapped and fixed to the axial surface of the rotor ring 200, and the drive side of the end cover 400 is fixedly connected to the drive shaft, which is used to drive the drive shaft to rotate when the rotor ring 200 rotates freely relative to the inner stator ring 100 and the outer stator ring 300, and the drive shaft is used to connect to an external rotatable structure.

[0035] Specifically, the inner stator ring 100 is fixedly disposed near the motor structure axis to generate a first rotating magnetic field. The rotor ring 200 is sleeved on the side of the inner stator ring 100 away from the motor axis and is coplanar with the inner stator ring 100. The rotor ring 200 is a yokeless structure, that is, it does not include the iron core yoke of a traditional motor, while the inner stator ring 100 is disposed in the original position of the iron core yoke. The outer stator ring 300 is sleeved on the radially outer side of the rotor ring 200 to generate a second rotating magnetic field. The end cover 400 has a disc-shaped surface with the same outer diameter as the rotor ring 200. The disc-shaped surface is snapped and fixed to the axial surface of the rotor ring 200, for example, by bolts or a slot structure, or any other connection method. The two ends of the structural ridge 220 are fixedly connected to the end covers 400 on both sides, thereby transmitting the torque from the magnetic steel laminate to the end covers 400. The drive side of the end cover 400 is fixedly connected to the drive shaft, for example, by a key connection, to enhance the connection stability between the rotor ring 200 and the end cover 400. Preferably, the end cover 400 includes a front end cover 410 and a rear end cover 420 arranged in pairs. The front end cover 410 is fixedly connected to the radial surface of one end of the rotor ring 200, and the rear end cover 420 is fixedly connected to the radial surface of the other end of the rotor ring 200.

[0036] Please refer to the following: Figure 1 , Figure 2 and Figure 6The inner stator ring 100 includes an inner stator support 110 and an inner stator winding 120. The inner stator support 110 has winding teeth 500 on its surface away from the axis, and the inner stator winding 120 is wound on the winding teeth 500 of the inner stator support 110. The inner stator winding 120 is a concentrated winding. The outer stator ring 300 includes an outer stator support 310 and an outer stator winding 320. The outer stator support 310 has winding teeth 500 on its surface near the axis, and the outer stator winding 320 is wound on the winding teeth 500 of the outer stator support 310. The outer stator winding 320 is a concentrated winding. That is, each winding tooth 500 independently winds a coil, with no overlap between adjacent coils, forming a single-tooth concentrated winding. This type of winding has extremely short end lengths, low copper losses, and the energizing phase sequence of each coil can be independently controlled. The three-phase AC power connection method of the inner stator winding 120 and the outer stator winding 320 is existing technology and will not be described in detail here. When AC power is applied to the inner stator winding 120 and the outer stator winding 320, the inner stator ring 100 generates a first rotating magnetic field passing through the inner air gap, and the outer stator ring 300 generates a second rotating magnetic field passing through the outer air gap. Preferably, the width of the inner and outer air gaps is 1 mm. Since the rotor ring 200 is located between the inner and outer air gaps and has no iron core yoke structure, the two rotating magnetic fields simultaneously apply magnetic torque on the inner and outer sides of the rotor ring 200, jointly driving the rotor ring 200 to rotate freely relative to the inner stator ring 100 and the outer stator ring 300. When the rotor ring 200 rotates, its axial surface is fixed by a snap-fit, causing the end cover 400 to rotate synchronously. The end cover 400 then drives the drive shaft to rotate, and finally the drive shaft outputs torque to the external rotatable structure. This embodiment utilizes the inner stator ring 100 and the outer stator ring 300 to symmetrically generate magnetic force on both sides of the rotor ring 200. Without increasing the weight of the rotor ring 200 or the amount of magnetic material, the effective magnetic flux is increased to twice that of the traditional single stator structure, thereby achieving high power density direct drive output. At the same time, since the rotor ring 200 does not require the support of the central hub iron core, the overall weight is significantly reduced, making it suitable for aerospace and other scenarios with stringent power-to-weight ratio requirements.

[0037] Please refer to the following: Figure 1 , Figure 2 and Figure 3 In some preferred embodiments, the rotor ring 200 includes a rotor sub-ring 210 and a structural ridge 220; wherein, the rotor sub-ring 210 is provided with a fixing hole 201; the structural ridge 220 passes through the fixing hole 201 and is connected to the end cap 400 for fixing the rotor sub-ring 210 to the end cap 400.

[0038] Specifically, this embodiment uses a single rotor ring 210 as an example to illustrate the structure of the rotor ring 200. The structural ridge 220 is used to transmit torque between the rotor ring 200 and the end cap 400. It provides radial and axial rigidity, resists centrifugal force, and maintains air gap geometric accuracy. It can be made of a rigid material with properties such as non-magnetic, lightweight, high specific strength, and low thermal expansion. Preferably, the structural ridge 220 can be a carbon structural ridge 220, or it can be any composite material that meets the material property requirements, such as a glass fiber composite structural ridge 220, an aramid fiber composite structural ridge 220, or a ceramic matrix composite structural ridge 220. The number of structural ridges 220 is multiple, and the axial surface of the rotor ring 210 has multiple through holes. The structural ridges 220 are respectively inserted into different through holes of the rotor ring 210, and each structural ridge 220 is parallel to the axial direction of the dual-stator single-rotor yokeless radial structure. The end cap 400 is provided with several fixing through holes for accommodating the structural ridges 220. Each structural ridge 220 is interference-fitted with the fixing through holes and is snapped into place. Thus, the torque force from the magnet laminate is transmitted to the end cap 400 through the structural ridges 220, and the tension of the structural ridges 220 tightly presses the internal magnet 212 rotor laminate between the two end caps 400. In this embodiment, the rotor ring 210 is mechanically fixed by the structural ridges 220, without relying on adhesives such as glue or resin. Meanwhile, without the need for a central hub iron core support, the carbon structure ridge 220 ensures the structural integrity and air gap geometry of the rotor at extreme speeds. The internal magnet 212 rotor laminate between the two end caps 400 is pressed tightly by tension, ensuring structural integrity and rotor assembly torsion and bending rigidity, ensuring the integrity of the air gap and fixing the rotor to resist centrifugal force, thus enabling high-speed operation.

[0039] Further, the rotor ring 210 includes a rotor support 211 and a magnet 212. The rotor support 211 is fixedly connected to the structural ridge 220. The magnet 212 is uniformly mounted on the rotor support 211 along its circumference and is connected to the end cover 400 via the rotor support 211. The rotor support 211 provides support; the magnet 212, connected to the end cover 400 via the rotor support 211, forms the motor rotor.

[0040] Please see Figures 3 to 5The rotor support 211 includes a plurality of magnet fixing components 2111 and non-magnetic filling structures 2112 evenly arranged along the circumference of the rotor ring 210. The magnet fixing components 2111 and the magnets 212 are spaced apart. The magnet fixing components 2111 are provided with snap-fit ​​grooves 21111 at both ends and fixed through holes. The snap-fit ​​grooves 21111 are used to accommodate and snap the magnets 212, so that the magnets 212 are spaced apart along the circumference of the rotor support 211. The non-magnetic filling structures 2112 are embedded in the fixed through holes and are used to fix the rotor support 211 on the structural ridge 220.

[0041] In this embodiment, the magnet fixing assembly 2111 is used to mechanically constrain the magnet 212, and the non-magnetic filling structure 2112 serves as a mechanical support medium to fix the relative position between the magnet laminate and the carbon structural ridge 220. Specifically, since the structural ridge 220 provides support in this invention, each of the plurality of magnet fixing assemblies 2111 is independently arranged, and at least one of the magnet fixing assemblies 2111 is I-shaped, with locking grooves 21111 on both sides along the circumferential direction for locking the magnet 212. That is, one side of each magnet 212 along the circumferential direction is engaged with one end of one magnet fixing assembly 2111, and the other side of the magnet 212 is engaged with the other end of another magnet fixing assembly 2111. Simultaneously, each magnet fixing assembly 2111 is connected to the structural ridge 220 through a fixing through hole and a non-magnetic filling structure 2112 passing through the fixing through hole, providing support to the magnet fixing assembly 2111, thereby fixing the magnet in the circumferential direction of the rotor through the magnet fixing assembly 2111. In this preferred embodiment, the rotor support 211 uses only a few magnet fixing assemblies 2111 to fix the magnets 212. Compared to a complete rotor support 211 structure that does not require a supporting iron core to support and fix the magnets, its structure is simpler, thereby reducing the overall weight of the system rotor.

[0042] The rotor ring 200 includes several pairs of magnets 212 with opposite magnetic pole directions, meaning that the magnetic pole directions of adjacent magnets 212 are alternately distributed. The inner stator ring and outer stator ring are respectively provided with inner stator windings 120 and outer stator windings 320 for connecting three-phase alternating current, thereby generating a rotating magnetic field acting on the magnets 212 through the inner stator windings 120 and outer stator windings 320, and generating an electromagnetic torque to drive the rotor ring 200 to rotate. The number of three-phase windings on the outer stator winding 320 and the number of three-phase windings on the inner stator winding 120 respectively determine the number of pole pairs of the outer stator ring 300 and the number of pole pairs of the inner stator ring 100, and the number of pairs of magnets 212 with opposite magnetic pole directions on the rotor ring determines the number of magnetic pole pairs. It should be noted that the present invention may employ an outer stator ring 300 and an inner stator ring 100 with any number of pole pairs, and a rotor ring with any number of magnetic pole pairs, without any limitation.

[0043] Furthermore, the non-magnetic filling structure 2112 has a filling adjustment slot 21121, which is used to accommodate the structural ridge 220 and adjust the relative position between the rotor ring 210 and the structural ridge 220.

[0044] Specifically, the structural ridge 220 passes through the filling adjustment slot 21121 of the non-magnetic filling structure 2112 and is also inserted into the fixing hole 201 of the rotor ring 210 along with the non-magnetic filling structure 2112. By adjusting the position of the filling adjustment slot 21121 of the non-magnetic filling structure 2112 corresponding to a single rotor ring 210, the relative position between the corresponding rotor ring 210 and the structural ridge 220 can be adjusted. The relative position can refer to the staggered angle between the rotor ring 210 and the structural ridge 220, or it can refer to other positional parameters of the rotor ring 210 on the structural ridge 220. Preferably, by adjusting the position of the filling adjustment slot 21121 on the non-magnetic filling structure 2112, the fixed position of the structural ridge 220 in the fixing hole 201 can be adjusted, thereby adjusting the staggered angle between the structural ridge 220 and the rotor ring 210. Thus, by maintaining different angles between each rotor sub-ring 210 and the structural ridge 220, adjacent rotor sub-rings 210 in the rotor ring 200 are staggered by a first staggered angle. Preferably, the magnet fixing assembly 2111 is made of grain-oriented electrical steel by stamping or die casting, such as... Figure 6The black arrow indicates the grain direction of the magnet fixing assembly 2111, which is consistent with the direction of the maximum rotor magnetic flux. The rotor magnetic flux refers to the direction of the magnetic field strength at the point of highest magnetic flux density between two adjacent magnets 212 on the rotor ring 200. By employing a grain-oriented material, the characteristics of this material in the grain direction are far superior to those in the perpendicular direction. Therefore, by aligning the grain direction of the grain-oriented material with the direction of the maximum rotor magnetic flux, this invention significantly reduces the proportion of magnetic flux lines needing to cross high-resistivity grain boundaries. This allows the magnetic flux lines to be conducted along low-resistivity paths within the material, significantly reducing hysteresis loss and improving flux carrying capacity, resulting in superior working performance and magnetic properties. Consequently, the torque of the dual-stator single-rotor structure in this invention is significantly improved compared to existing motor structures.

[0045] In some preferred embodiments, there are multiple rotor rings 210, and an odd number of them; each rotor ring 210 is provided with a fixing hole 201; the structural ridge 220 passes through the fixing hole 201 and is connected to the end cover 400, for fixing each rotor ring 210 to the end cover 400 respectively; the rotor rings 210 are arranged parallel to each other along the axial direction. By dividing the rotor ring 200 into multiple electrically isolated rotor rings 210 in the axial direction, and separating each rotor ring 210 by gaps, the equivalent resistance on the eddy current path induced when the magnetic flux changes is increased, thereby suppressing eddy current losses in the running motor scenario and improving the power density of the rotor ring 200 when it is working with the same thickness.

[0046] Please refer to the following: Figures 4 to 8 The rotor ring 200 has a plurality of rotor sub-rings 210 arranged in a stepped manner. The rotor sub-ring 210 at the starting position and the rotor sub-ring 210 at the ending position are mirror-symmetrical about the plane in which the intermediate rotor sub-ring 210 is located. The adjacent rotor sub-rings 210 from the intermediate rotor sub-ring 210 to the starting position and the adjacent rotor sub-rings 210 from the intermediate rotor sub-ring 210 to the ending position are staggered by a first staggered angle in the same direction.

[0047] The rotor ring 200 can be composed of one rotor sub-ring 210 or multiple rotor sub-rings 210. In a preferred embodiment of the rotor ring 200 composed of multiple rotor sub-rings 210, each rotor sub-ring 210 is implemented using an annular rotor of equal thickness, and the structure, radius, and axial thickness of each rotor sub-ring 210 are the same. Preferably, at least one rotor sub-ring 210 of the rotor ring 200 is composed of the rotor support 211 and magnet 212 as described above. In this embodiment, the fixing through hole 201 is provided on the rotor support 211, and the center position of each magnet fixing assembly 2111 is provided with a fixing through hole 201 for accommodating the structural ridge 220. Then, several structural ridges 220 pass through multiple rotor sub-rings 210 in sequence to fix the deflection angle and axial position of the rotor sub-rings 210. At the same time, the end of the structural ridge 220 is fixedly connected to the disk-shaped surface on the fixed side of the end cover 400 to realize the transmission between the rotor and the end cover 400.

[0048] In this embodiment, adjacent rotor rings 210 are staggered by a first stagger angle to suppress cogging forces and unwanted harmonics in the torque spectrum. It should be noted that the stepped arrangement refers to staggering adjacent rotor rings 210 in the rotor ring 200 by a predetermined angle, so that the magnets 212 in different rotor rings 210 are correspondingly staggered by the predetermined angle, causing the cogging torque waveforms generated by each rotor ring 210 to be phase-shifted, thereby reducing the total cogging torque. Simultaneously, the staggered angle weakens specific order harmonic components. The thickness of each rotor ring 210 and the tilt angle from one rotor ring 210 to another can be set to optimal values, which can be determined in advance through testing. Specifically, by changing the position of the filling adjustment slots 21121 on the non-magnetic filling structure 2112, each rotor ring 210 can be set to any angle value within the structural filling width range.

[0049] Please see Figure 3 , Figure 4 as well as Figures 6 to 8For ease of explanation, this embodiment uses a rotor ring 200 composed of five rotor rings 210: a first rotor ring 210a, a second rotor ring 210b, a third rotor ring 210c, a fourth rotor ring 210d, and a fifth rotor ring 210e. Any structural ridge 220 is connected and fixed to the first rotor ring 210a via a first magnet fixing assembly 2111a and a first non-magnetic filling structure 2112a, and is further fixed via a second magnet fixing assembly 2111b and a second... The non-magnetic filling structure 2112b is connected and fixed to the second rotor ring 210b, and is connected and fixed to the third rotor ring 210c via a third magnet fixing assembly 2111c and a third non-magnetic filling structure 2112c. It is connected and fixed to the fourth rotor ring 210d via a fourth magnet fixing assembly 2111d and a fourth non-magnetic filling structure 2112d, and to the fifth rotor ring 210e via a fifth magnet fixing assembly 2111e and a fifth non-magnetic filling structure 2112e. Therefore, the filling adjustment slot 21121 on the non-magnetic filling structure 2112 can be located in three positions: a first position, a second position, and a third position. A schematic diagram of the structure when the filling adjustment slot 21121 is located in the first position on the non-magnetic filling structure 2112 is shown below. Figure 7 As shown, the structural diagram when in the second position is as follows: Figure 6 As shown, the structural diagram when in the third position is as follows: Figure 8 As shown, this allows for three staggered angles between the rotor ring 210 and the structural ridge 220. Preferably, there is an odd number of rotor rings 210, and the rotor rings 210 in the rotor ring 200 are arranged in a V-shaped stepped configuration. The rotor rings 210 at the beginning and the rotor rings 210 at the end are mirror-symmetrical about the plane containing the middle rotor ring 210, and adjacent rotor rings 210 are staggered by a first staggered angle in the same direction. It should be noted that the mirror-symmetrical arrangement of the rotor rings 210 enables the rotor ring 200 to have superior harmonic suppression performance. The middle rotor ring 210 is used to indicate the rotor ring 210 closest to the center of the rotor ring 200. For example, if the number of rotor rings 210 included in the rotor ring 200 is n, and the number of rotor rings 210 is odd, the middle rotor ring 210 is the nth rotor ring. The third rotor ring 210c is a rotor ring 210 with the filling adjustment slot 21121 located at the third position on the non-magnetic filling structure 2112. When the multiple rotor rings 210 in the rotor ring 200 are arranged in a stepped manner, the plane where the middle rotor ring 210 is located is a plane of symmetry. The rotor rings 210 from the starting position to the ending position of the middle rotor ring 210 are symmetrical. That is, the second rotor ring 210b and the fourth rotor ring 210d are symmetrical about the third rotor ring 210c, and the filling adjustment slots 21121 of the second non-magnetic filling structure 2112b and the fourth non-magnetic filling structure 2112d are located at the second position, such as... Figure 6 As shown. Correspondingly, the adjacent first rotor ring 210a and fourth rotor ring 210d are symmetrical about the third rotor ring 210c, and the filling adjustment slots 21121 of the second non-magnetic filling structure 2112b and the fourth non-magnetic filling structure 2112d are located in the third position, as shown. Figure 8 As shown, the first rotor ring 210a to the fifth rotor ring 210e are staggered by an interleaved angle.

[0050] It should be noted that the number of rotor rings 210 can also be an even number. In this case, the intermediate rotor ring 210 is the [number missing]. and If there are an even number of rotor rings 210, then the plane of symmetry when the number of rotor rings 210 is even is located at the th ... and The perpendicular bisectors of the lines connecting the centers of the two rotor rings 210 overlap. This is located at the starting position, i.e., from the first rotor ring 210 to the second... The rotor ring 210 is sequentially connected to the last rotor ring 210 to the first... Each rotor ring 210 is mirror-symmetrical about the plane of symmetry. The rotor rings 200 can also be arranged in other ways, or in other stepped, staggered configurations, such as M-shaped or ramp-shaped, as long as there is a staggered angle between adjacent rotor rings 210. For example, the multiple rotor rings 210 can be staggered in one direction from the starting position to the ending position. In this embodiment, the number of rotor rings 210 can be odd or even, which will not be elaborated further here.

[0051] In this preferred embodiment, the rotor ring 200 is axially divided into multiple independent rotor sub-rings 210. The tilt angle of the magnet 212 relative to the stator teeth in each rotor sub-ring 210 is set to a different value, forming an axial stepped tilt structure, which causes the cogging torque waveforms generated by each rotor sub-ring 210 to be misaligned and canceled out. Simultaneously, the non-magnetic filling and electrical isolation structure between the multiple rotor sub-rings 210 cuts off the continuous path of eddy currents, effectively reducing rotor eddy current losses. This achieves high power density, low noise, low-speed, high-torque direct-drive output, suitable for aerospace electric propulsion systems.

[0052] Based on the same inventive concept, the present invention also provides a rotor ring for the aforementioned double-stator single-rotor yokeless radial structure. The rotor ring can be used independently in the stator and rotor design of any generator or motor. The structure of the rotor ring is as described in the specific embodiment of the double-stator single-rotor yokeless radial structure above, and will not be repeated here.

[0053] Based on the same inventive concept, the present invention also provides an electric motor comprising the rotor ring described above. The structure of the rotor ring is as described in the specific embodiment of the double-stator single-rotor yoke-less radial structure above, and will not be repeated here.

[0054] This invention provides a dual-stator single-rotor yokeless radial structure, a rotor ring, and a motor. The dual-stator single-rotor yokeless radial structure is disposed in the motor structure and includes: an inner stator ring, fixedly disposed near the motor structure axis; a rotor ring, sleeved on the side of the inner stator ring away from the motor axis and coplanar with the inner stator ring, with an internal air gap between the rotor ring and the inner stator ring; an outer stator ring, sleeved on the radially outer side of the rotor ring, with the inner stator ring, rotor ring, and outer stator ring being coplanar along the radial direction, and an external air gap between the outer stator ring and the rotor ring; and an end cap, which is snapped and fixed to the axial surface of the rotor ring, with the drive side of the end cap fixedly connected to a drive shaft for driving the drive shaft to rotate when the rotor ring rotates freely relative to the inner and outer stator rings. This invention connects and fixes the rotor ring through the end cap, and transmits the magnetic torque force on the inner and outer sides of the rotor to the external drive shaft in the absence of a central hub iron core support structure. This improves the structural rigidity and strength without central hub support, and ensures the structural integrity of the motor, the dynamic response speed of the motor, and the operating efficiency at high rotor speeds.

[0055] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A dual-stator, single-rotor, yoke-free radial structure, characterized in that, The dual-stator single-rotor yokeless radial structure is provided in the motor structure, including: The inner stator ring is fixedly installed near the center of the motor structure shaft. The rotor ring is sleeved on the side of the inner stator ring away from the motor shaft and is coplanar with the inner stator ring. There is an internal air gap between the rotor ring and the inner stator ring. An outer stator ring is sleeved on the radially outer side of the rotor ring, and the inner stator ring, rotor ring and outer stator ring are arranged coplanarly along the radial direction, with an external air gap between the outer stator ring and the rotor ring; The end cap is snapped and fixed to the axial surface of the rotor ring. The drive side of the end cap is fixedly connected to the drive shaft and is used to drive the drive shaft to rotate when the rotor ring rotates freely relative to the inner stator ring and the outer stator ring.

2. The dual-stator single-rotor yokeless radial structure according to claim 1, characterized in that, The rotor ring includes a rotor sub-ring and a structural ridge; wherein, the rotor sub-ring is provided with a fixing hole; the structural ridge passes through the fixing hole and is connected to the end cap for fixing the rotor sub-ring to the end cap.

3. The dual-stator single-rotor yokeless radial structure according to claim 2, characterized in that, The rotor rings are multiple and an odd number; each rotor ring has a fixing hole; the structural ridge passes through the fixing hole and is connected to the end cap, for fixing each rotor ring to the end cap respectively; the rotor rings are arranged parallel to each other along the axial direction. The rotor rings are arranged in a stepped manner. The rotor rings at the beginning and the rotor rings at the end are mirror-symmetrical about the plane containing the middle rotor ring. The adjacent rotor rings from the middle rotor ring to the beginning and the adjacent rotor rings from the middle rotor ring to the end are staggered by a first staggered angle in the same direction.

4. The dual-stator single-rotor yokeless radial structure according to claim 2, characterized in that, The rotor ring includes a rotor support and a magnet. The rotor support is fixedly connected to the structural ridge. The magnet is evenly installed on the rotor support along the circumferential direction of the rotor support and is connected to the end cover through the rotor support.

5. The dual-stator single-rotor yokeless radial structure according to claim 4, characterized in that, The rotor support includes a plurality of magnet fixing components and non-magnetic filling structures evenly arranged along the circumference of the rotor rings. The magnet fixing components and the magnets are spaced apart. The magnet fixing components have snap-fit ​​grooves at both ends and fixing through holes. The snap-fit ​​grooves are used to accommodate and snap the magnets, so that the magnets are spaced apart along the circumference of the rotor support. The non-magnetic filling structures are embedded in the fixing through holes and are used to fix the rotor support to the ridge of the structure.

6. The dual-stator single-rotor yokeless radial structure according to claim 5, characterized in that, The non-magnetic filling structure has a filling adjustment slot, which is used to accommodate the structural ridge and adjust the relative position between the rotor ring and the structural ridge.

7. The dual-stator single-rotor yokeless radial structure according to claim 5, characterized in that, The magnet fixing assembly is made of grain-oriented electrical steel by stamping or die casting, and the grain direction of the magnet fixing assembly is consistent with the direction of the maximum value of the rotor magnetic flux.

8. The dual-stator single-rotor yokeless radial structure according to claim 1, characterized in that, The inner stator ring includes: an inner stator support and an inner stator winding; the inner stator support has winding teeth on a surface away from the axis, and the inner stator winding is wound on the winding teeth of the inner stator support, and the inner stator winding is a concentrated winding. The outer stator ring includes an outer stator support and an outer stator winding; the outer stator support has winding teeth on its surface near the shaft center, and the outer stator winding is wound on the winding teeth of the outer stator support, and the outer stator winding adopts a concentrated winding.

9. A rotor ring, characterized in that, Used for the dual-stator single-rotor yokeless radial structure as described in any one of claims 1 to 8.

10. An electric motor, characterized in that, Includes the rotor ring as described in claim 9.

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