Stator topology based on double-sided permanent magnet coupling flux-switching drive

Abstract

The application relates to the field of topological structures, in particular to a flux-switching driving stator topological structure based on double-sided permanent magnet coupling, which comprises a C-shaped core, the inside of which is provided with spoke-type permanent magnets; tooth-end auxiliary permanent magnets, which are arranged on the two sides of the stator poles of the C-shaped core; and slot-end auxiliary cores, which are arranged outside the tooth-end auxiliary permanent magnets to combine the tooth-end auxiliary permanent magnets to form new magnetic circuits, so that the new magnetic circuits pass through the stator pole split teeth which are not utilized in the flux-switching process. The tooth-end auxiliary permanent magnets and the slot-end auxiliary cores construct new magnetic circuits, the new magnetic circuits pass through the stator pole split teeth which are not utilized in the flux-switching process through the flux-switching electromagnetic driving, the utilization rate of the stator core is improved, the back electromotive force and the output torque are improved, the traditional spoke-type permanent magnet leakage is inhibited, and the cogging torque is reduced.

Description

Technical Field

[0001] This invention relates to the field of topology, and more particularly to a flux-switching drive stator topology based on dual-sided permanent magnet coupling. Background Technology

[0002] In traditional permanent magnet synchronous drives, permanent magnets are typically located on the rotor and connected using anaerobic adhesives, which complicates the rotor structure. Furthermore, heat dissipation is difficult in these traditional drives, and the permanent magnets are at risk of demagnetization under high-intensity operating conditions. Flux-switched permanent magnet drives, as one of the main types of stator permanent magnet motors, innovatively embed tangentially magnetized permanent magnets within the stator slots, completely eliminating the need for permanent magnets on the rotor. This simplifies the rotor to a salient pole structure composed solely of magnetically conductive material. This design fundamentally changes the magnetic field modulation mechanism of traditional drives: when the salient pole rotor rotates, the air gap permeability between the stator and rotor changes periodically with the rotor position, modulating the constant magnetic field generated by the permanent magnets and the alternating magnetic field generated by the armature windings, exciting multiple operating harmonics. These harmonics interact to form an effective electromagnetic torque, driving the rotor to rotate continuously and output power. The flux-switching permanent magnet drive not only simplifies the rotor structure, reducing manufacturing difficulty and rotational inertia, but also transfers the permanent magnet to the stator side, enabling it to achieve efficient heat dissipation directly through the stator core and housing, significantly improving the permanent magnet's resistance to demagnetization under high load conditions.

[0003] Chinese Patent Publication No. CN111181271A discloses a dual-stator staggered rotor tooth flux-switching permanent magnet motor and electromagnetic device. It solves the problem of incoordination between torque density improvement and torque ripple suppression in existing flux-switching permanent magnet motors, offering high power density, strong overload capacity, low cogging torque, low torque ripple, and suitability for modular manufacturing. The motor includes an inner stator located inside the rotor; an outer stator located outside the rotor; and a rotor with a plurality of inner and outer rotor teeth evenly distributed on its inner and outer sides, respectively. These inner and outer rotor teeth are staggered, allowing permanent magnet flux to alternately converge in the air gaps between the inner and outer sides of the rotor to increase torque density. Torque ripple is suppressed by the superposition of torque components generated in the air gaps between the inner and outer sides of the rotor.

[0004] Chinese Patent Publication No. CN108445763A discloses an electromagnetic catapult system and control method based on a cylindrical flux-switching linear motor. The system includes a cylindrical flux-switching linear motor, an auxiliary electromagnetic deceleration device, a sensorless control, and a central controller. The sensorless control includes an initial position detection module, a low-speed range position detection module, a medium-to-high-speed range position detection module, and a transition region position switching module. The central controller employs dual closed-loop control; the dual closed-loop control combines repetitive control, a sensorless control algorithm, and PI feedback control in a speed loop and a PI-regulated space vector current loop. This invention combines a cylindrical flux-switching linear motor, sensorless technology, and a dual closed-loop control method based on speed and current controllers in an electromagnetic catapult system, improving the stability, reliability, and dynamic response capability of the catapult system while reducing the manufacturing cost and installation difficulty of the electromagnetic catapult device.

[0005] However, the following problems still exist in the existing technology:

[0006] In the existing technology, in the traditional flux-switched permanent magnet drive structure, each split stator tooth only conducts magnetic flux on one side of the structure, resulting in a waste of magnetic circuit, limiting the torque density of the motor, and causing low utilization of the split stator teeth, as well as low output torque and torque density of the motor. Summary of the Invention

[0007] To address this, the present invention provides a flux-switching drive stator topology based on dual-sided permanent magnet coupling, which solves the problem in the prior art where, in the traditional flux-switching permanent magnet drive structure, each split stator tooth only conducts magnetic flux on one side, resulting in wasted magnetic circuits, limiting the torque density of the motor, and causing low utilization of the split stator teeth, as well as low output torque and torque density of the motor.

[0008] To achieve the above objectives, the present invention provides a flux-switching drive stator topology based on dual-sided permanent magnet coupling, comprising:

[0009] The C-type iron core has spoke-shaped permanent magnets inside;

[0010] Tooth-end auxiliary permanent magnets are disposed on both sides of the stator pole of the C-shaped iron core;

[0011] A slotted auxiliary iron core is disposed on the outside of the toothed auxiliary permanent magnet to form a new magnetic circuit in conjunction with the toothed auxiliary permanent magnet, so that the new magnetic circuit passes through the stator pole splitting teeth that are not used during the magnetic flux switching process.

[0012] Furthermore, the C-shaped iron core is connected by a thin magnetic bridge to position the stator.

[0013] Furthermore, the spoke-shaped permanent magnet has alternating tangential magnetization directions in the circumferential direction.

[0014] Furthermore, the tooth-end auxiliary permanent magnet is magnetized tangentially, and the direction of magnetization is opposite to the tangential magnetization direction of the spoke-type permanent magnet.

[0015] Furthermore, the magnetic flux path corresponding to the spoke-type permanent magnet is such that the magnetic flux originates from the spoke-type permanent magnet, flows through one side of the stator pole splitting teeth, enters the rotor, and forms a closed loop.

[0016] Furthermore, the magnetic flux path corresponding to the tooth-end auxiliary permanent magnet is such that the magnetic flux is emitted from the tooth-end auxiliary permanent magnet, flows through the other side of the stator pole splitting tooth, and enters the rotor to form a closed loop.

[0017] Furthermore, the rotor teeth are aligned with the stator pole splitting teeth, and the magnetic flux generated by the spoke-type permanent magnet and the tooth-end auxiliary permanent magnet has the same direction.

[0018] Furthermore, the magnetic flux path generated by the spoke-type permanent magnet and the magnetic flux path generated by the tooth-end auxiliary permanent magnet pass through both sides of the stator pole splitting tooth, respectively.

[0019] Furthermore, it also includes a winding, which is a single-layer concentrated winding.

[0020] Furthermore, it also includes a rotor, which has a multi-salient pole structure.

[0021] Compared with existing technologies, this invention features a C-shaped iron core containing spoke-type permanent magnets; tooth-end auxiliary permanent magnets positioned on both sides of the stator poles of the C-shaped iron core; and slotted auxiliary iron cores positioned outside the tooth-end auxiliary permanent magnets. These elements combine to form a new magnetic circuit, allowing the new magnetic circuit to utilize the stator pole split teeth that are not utilized during flux switching. This invention constructs a new magnetic circuit using tooth-end auxiliary permanent magnets and slotted auxiliary iron cores. This new magnetic circuit, through flux switching electromagnetic drive, utilizes the stator pole split teeth that are not utilized during flux switching, improving stator core utilization, increasing back electromotive force and output torque, and suppressing leakage flux and reducing cogging torque associated with traditional spoke-type permanent magnets.

[0022] In particular, this invention introduces new magnetic flux paths by setting toothed auxiliary permanent magnets on both sides of the stator poles of the C-type iron core. In practice, in traditional flux-switching permanent magnet drives, such as U-core, C-core, and E-core structures, each split stator tooth only has one side with an effective magnetic conduction path to carry and switch the magnetic flux generated by the permanent magnet and armature winding. At this time, the stator core material in the unutilized area does not fully participate in the establishment of the main magnetic flux and the energy conversion process, forming a substantial "magnetic circuit idle area." In each flux switching process, half of the split teeth of the stator pole are wasted. Furthermore, since magnetic flux modulation and torque generation rely only on a single-sided path, the available... The effective magnetic flux and reluctance torque potential are both limited, restricting the torque density of the motor. Based on this, the present invention considers setting tooth-end auxiliary permanent magnets on both sides of the stator pole of the C-type iron core to introduce new magnetic flux paths, activate the magnetic permeability on both sides of the stator pole of the C-type iron core, and incorporate the originally idle iron core area into the main magnetic flux circuit, thereby improving the utilization rate of the stator iron core. The newly added magnetic flux path works in parallel with the original path, increasing the total available magnetic flux and the intensity and nonlinear characteristics of magnetic flux switching. Furthermore, by making full use of the double-sided magnetic circuit and introducing a stronger magnetic flux modulation effect, the utilization rate of the magnetomotive force source and the magnetic energy conversion efficiency per unit volume are improved, thereby achieving an increase in the torque density and power density of the drive.

[0023] In particular, this invention improves the coil's flux linkage by creating a new magnetic flux path. In practice, traditional C-core magnetic circuits are typically long and tortuous, resulting in relatively high magnetic reluctance and limiting the generation of magnetic flux. Furthermore, long magnetic circuits and imperfectly closed circuit structures easily generate leakage flux, which fails to effectively cross the air gap and couple to the armature winding, resulting in wasted magnetomotive force. The combination of these factors makes it difficult to increase the effective flux linkage of the coil. It is understood that magnetic flux determines the driving back electromotive force and electromagnetic matrix, thus limiting its back electromotive force and torque output capabilities. Based on this, this invention considers creating a new magnetic flux path by shortening the main magnetic flux path, optimizing the flux flow direction, improving the closed characteristics of the magnetic circuit, reducing leakage flux, and converting more magnetomotive force into working flux that effectively crosses the air gap and couples with the winding, thereby improving the coil's flux linkage. In particular, at the same rotational speed, the increased flux linkage leads to an increase in the amplitude of the induced back electromotive force, resulting in increased torque output and torque density.

[0024] In particular, this invention considers the torque ripple of the drive. In practice, the open structure of the traditional C-core disrupts the complete symmetry of the magnetic circuit, resulting in inherent non-uniformity in the distribution of the magnetic circuit. This non-uniformity introduces specific spatial harmonics, generating additional ripple torque components. At the same time, the C-core structure is usually accompanied by fewer stator slots and larger slot openings, which exacerbates the cogging torque generated by the interaction between the permanent magnet and the stator slots, leading to torque ripple. Furthermore, due to the limitations of the C-core's geometry and manufacturing process, its winding distribution sometimes cannot achieve the most ideal sinusoidal shape or the optimal short-pitch / distribution coefficient. Non-ideal winding distribution introduces harmonic currents, and the interaction between harmonic currents and the fundamental flux linkage generates ripple torque. The combination of these three factors makes it difficult to reduce the torque ripple level of the C-core. Based on this, this invention proposes a dual-sided magnetic circuit design and optimizes the dual flux paths to avoid saturation of the single-sided magnetic circuit, balance the flux load on both sides of the split teeth, and reduce the torque ripple of the drive. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the flux switching drive stator according to an embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the magnetic circuit generated by the spoke-type permanent magnet in an embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the magnetic circuit generated by the tooth-end auxiliary permanent magnet in an embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the magnetic circuit generated by the spoke-type permanent magnet and the toothed auxiliary permanent magnet in an embodiment of the present invention;

[0029] Figure 5 This is a diagram of the magnetic field lines generated by the spoke-type permanent magnet in an embodiment of the present invention.

[0030] Figure 6 This is a diagram of the magnetic field lines generated by the tooth-end auxiliary permanent magnet in an embodiment of the present invention.

[0031] Figure 7 This is a numerical diagram of the open-circuit flux linkage of the spoke-type permanent magnet and the toothed auxiliary permanent magnet for individual and joint excitation in an embodiment of the present invention.

[0032] Figure 8 The back electromotive force diagrams of the flux-switching electromagnetic drive with a new magnetic circuit and the conventional C-core stator flux-switching motor at a speed of 2000 rpm are shown in the embodiments of the present invention.

[0033] Figure 9The output torque diagrams of a flux-switching electromagnetic drive with a new magnetic circuit under 10A line current excitation and a conventional C-core stator flux-switching motor are shown in the embodiments of the present invention.

[0034] Among them, C-type iron core 1, slot auxiliary iron core 2, tooth end auxiliary permanent magnet 3, spoke type permanent magnet 4, stator pole split tooth 5, stator pole 6, winding 7, rotor 8, magnetic circuit of spoke type permanent magnet (blue arrow line) 9, leakage magnetic circuit of spoke type permanent magnet (black arrow line) 10, and magnetic circuit of tooth end auxiliary permanent magnet (red arrow line) 11. Detailed Implementation

[0035] To make the objectives and advantages of the present invention clearer, the present invention will be further described below with reference to embodiments; it should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention.

[0036] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0037] Please see Figure 1 , Figure 1 This is a schematic diagram of the flux-switching drive stator according to an embodiment of the present invention. The flux-switching drive stator topology based on dual-sided permanent magnet coupling of the present invention includes:

[0038] The C-type iron core has spoke-shaped permanent magnets inside;

[0039] Tooth-end auxiliary permanent magnets are disposed on both sides of the stator pole of the C-shaped iron core;

[0040] A slotted auxiliary iron core is disposed on the outside of the toothed auxiliary permanent magnet to form a new magnetic circuit in conjunction with the toothed auxiliary permanent magnet, so that the new magnetic circuit passes through the stator pole splitting teeth that are not used during the magnetic flux switching process.

[0041] Specifically, the flux switching process is the process in which the path and direction of the main magnetic flux inside the drive change as the rotor position changes and the winding energization state changes during the operation of the flux switching drive.

[0042] Specifically, there is no limitation on the number of stator poles and rotor poles of the flux-switching electromagnetic drive. In practice, the flux-switching electromagnetic drive inherits the configuration of the stator poles and rotor poles of the traditional flux-switching motor, with 6 stator poles and 13 rotor poles. Of course, those skilled in the art can also configure the stator poles and rotor poles according to the actual situation, which will not be elaborated here.

[0043] Specifically, this invention introduces new magnetic flux paths by setting tooth-end auxiliary permanent magnets on both sides of the stator poles of a C-type iron core. In practice, in traditional flux-switching permanent magnet drives, such as U-core, C-core, and E-core structures, each split stator tooth only has one side with an effective magnetic conduction path to carry and switch the magnetic flux generated by the permanent magnet and armature winding. In this case, the stator core material does not fully participate in the establishment of the main magnetic flux and energy conversion process in the ineffective area, forming a substantial "magnetic circuit idle area." During each flux switching process, half of the split teeth of the stator pole are wasted. Furthermore, since magnetic flux modulation and torque generation rely only on a single-sided path, it can... The available effective magnetic flux and reluctance torque potential are both limited, restricting the torque density of the motor. Based on this, the present invention considers setting tooth-end auxiliary permanent magnets on both sides of the stator pole of the C-type iron core to introduce new magnetic flux paths, activate the magnetic permeability on both sides of the stator pole of the C-type iron core, and incorporate the originally idle iron core area into the main magnetic flux circuit, thereby improving the utilization rate of the stator iron core. The newly added magnetic flux path works in parallel with the original path, increasing the total available magnetic flux and the intensity and nonlinear characteristics of magnetic flux switching. Furthermore, by making full use of the double-sided magnetic circuit and introducing a stronger magnetic flux modulation effect, the utilization rate of the magnetomotive force source and the magnetic energy conversion efficiency per unit volume are improved, thereby achieving an increase in the torque density and power density of the drive.

[0044] Specifically, the C-shaped iron core is connected by a thin magnetic bridge to position the stator.

[0045] Specifically, the thin magnetic bridge provides a rigid frame throughout the entire process of stamping, lamination, processing, and assembly, making the scattered C-shaped units into a single rigid body. This simplifies tooling design, ensures the accuracy and repeatability of each stage (especially lamination and processing), and facilitates positioning by using the complete outer circle to fit with the housing during assembly.

[0046] Specifically, the ease of processing is mainly reflected in the fact that when turning or grinding the inner hole after stacking, the overall rigid frame structure provides clamping rigidity and stability, reduces processing difficulty, and improves processing accuracy (roundness, concentricity) and efficiency.

[0047] Please see Figure 2 , Figure 2 This is a schematic diagram of the magnetic circuit generated by the spoke-type permanent magnet according to an embodiment of the present invention. Specifically, the spoke-type permanent magnet has alternating tangential magnetization directions in the circumferential direction.

[0048] Please see Figure 3 , Figure 3 This is a schematic diagram of the magnetic circuit generated by the tooth-end auxiliary permanent magnet according to an embodiment of the present invention. Specifically, the tooth-end auxiliary permanent magnet is magnetized tangentially, and the direction of magnetization is opposite to the tangential magnetization direction of the spoke-type permanent magnet.

[0049] Please see Figures 4-6 , Figure 4 This is a schematic diagram of the magnetic circuit generated by the spoke-type permanent magnet and the toothed auxiliary permanent magnet in an embodiment of the present invention. Figure 5 This is a magnetic field line diagram of the spoke-type permanent magnet generated according to an embodiment of the present invention. Figure 6 This is a magnetic field line diagram of the tooth-end auxiliary permanent magnet generated according to an embodiment of the present invention, where Φ1 represents the magnetic flux linkage of the left split tooth in the stator pole, and Φ2 represents the magnetic flux linkage of the right split tooth in the stator pole. Specifically, the magnetic flux path corresponding to the spoke-type permanent magnet is such that the magnetic flux originates from the spoke-type permanent magnet, flows through one side of the stator pole split tooth, enters the rotor, and forms a closed loop.

[0050] Specifically, the magnetic flux path corresponding to the tooth-end auxiliary permanent magnet is such that the magnetic flux is emitted from the tooth-end auxiliary permanent magnet, flows through the other side of the stator pole splitting tooth, and enters the rotor to form a closed loop.

[0051] Specifically, this invention improves the coil's flux linkage by creating a new magnetic flux path. In practice, traditional C-core magnetic circuits are typically long and tortuous, resulting in relatively high magnetic reluctance and limiting flux generation. Furthermore, the long magnetic circuit and imperfect closed-loop structure easily generate leakage flux, which fails to effectively cross the air gap and couple to the armature winding, wasting magnetomotive force. Combined, these factors make it difficult to increase the effective flux linkage of the coil. It is understood that flux determines the driving back electromotive force and electromagnetic matrix, thus limiting its back electromotive force and torque output capabilities. Therefore, this invention considers creating a new magnetic flux path by shortening the main flux path, optimizing the flux flow direction, improving the closed-loop characteristics of the magnetic circuit, reducing leakage flux, and converting more magnetomotive force into working flux that effectively crosses the air gap and couples with the winding, thereby improving the coil's flux linkage. In particular, at the same rotational speed, increased flux linkage leads to an increase in the amplitude of the induced back electromotive force, resulting in improved torque output and torque density.

[0052] Specifically, the rotor teeth are aligned with the stator pole splitting teeth, and the magnetic flux generated by the spoke-type permanent magnet and the tooth-end auxiliary permanent magnet has the same direction.

[0053] Specifically, the magnetic flux path generated by the spoke-type permanent magnet and the magnetic flux path generated by the tooth-end auxiliary permanent magnet pass through both sides of the stator pole splitting tooth, respectively.

[0054] Specifically, the topology constructed in this invention has two magnetic flux paths: a traditional magnetic flux path generated by spoke-type permanent magnets, and a new magnetic flux path generated by tooth-end auxiliary permanent magnets, which differs from the single magnetic flux path in conventional FSPM motors. The two portions of magnetic flux generated by a pair of spoke-type permanent magnets with opposite magnetization directions converge through one side of the stator pole of the C-core, while the magnetic flux excited by the tooth-end auxiliary permanent magnets can pass through the other side of the stator pole of the C-core. The slot auxiliary core helps reduce the magnetic reluctance of this path. In this case, the stator pole of the C-core, which is traditionally wasted in C-core type FSPM motors, can also be used for magnetic flux transmission, which helps increase the magnetic flux and back electromotive force of the winding coils. Furthermore, since the magnetization direction of the tooth-end auxiliary permanent magnets is opposite to that of the spoke-type permanent magnets inserted into this stator pole, the tooth-end auxiliary permanent magnets can suppress magnetic flux leakage generated by the spoke-type permanent magnets. The application of auxiliary slot irons not only reduces stator magnetic reluctance but also reduces cogging torque by shortening the slot width.

[0055] Specifically, this invention addresses the torque ripple issue in driving. In practice, the open structure of traditional C-cores disrupts the complete symmetry of the magnetic circuit, resulting in inherent non-uniformity in the magnetic circuit distribution. This non-uniformity introduces specific spatial harmonics, generating additional ripple torque components. Furthermore, C-core structures typically involve fewer stator slots and larger slot openings, exacerbating the cogging torque generated by the interaction between the permanent magnet and the stator slots, leading to torque ripple. Moreover, limited by the geometry and manufacturing process of C-cores, the winding distribution sometimes struggles to achieve the ideal sinusoidal shape or optimal short-pitch / distribution coefficient. Non-ideal winding distributions introduce harmonic currents, which interact with the fundamental flux linkage to generate ripple torque. The combination of these three factors makes it difficult to reduce the torque ripple level of C-cores. Therefore, this invention proposes a dual-sided magnetic circuit design and optimizes the dual flux paths to avoid saturation on one side of the magnetic circuit, balancing the flux load on both sides of the split teeth and reducing driving torque ripple.

[0056] Specifically, it also includes windings, which are single-layer concentrated windings.

[0057] Specifically, single-layer concentrated winding is a specific winding structure design in motors, in which there is only one layer of wire in each stator slot and each coil surrounds only one tooth. This is an existing structural design and will not be described in detail here.

[0058] Specifically, a single-layer concentrated winding configuration is used to obtain smaller winding ends.

[0059] Specifically, it also includes a rotor, which has a multi-salient pole structure.

[0060] Specifically, the rotor has no embedded permanent magnets or windings, which improves the mechanical strength and manufacturing convenience of the FSPM machine.

[0061] Specifically, the multi-salient pole structure is a key rotor configuration in motor design. Multiple salient poles are distributed circumferentially on the rotor, forming a periodic concave-convex structure. It is understood that the typical number of salient poles is 6, 8, and 12, which are existing structures and will not be elaborated further.

[0062] Please see Figure 7 , Figure 7 This is a numerical schematic diagram illustrating the open-circuit flux linkages generated individually and jointly by a spoke-type permanent magnet and a toothed-end auxiliary permanent magnet, according to an embodiment of the present invention. The diagram includes: a spoke-type permanent magnet flux linkage, a toothed-end auxiliary permanent magnet flux linkage, and a dual-permanent magnet flux linkage jointly excited by the spoke-type permanent magnet and the toothed-end auxiliary permanent magnet. Specifically, the flux linkages generated by the spoke-type permanent magnet and the toothed-end auxiliary permanent magnet have the same frequency and phase. Furthermore, the flux linkages excited by the two magnetorheological variants are close to the sum of the individual contributions of each magnetorheological variant, indicating that the dual-permanent magnet flux linkages operate relatively independently without significant magnetic circuit coupling or saturation.

[0063] Please see Figure 8 as well as Figure 9 , Figure 8 The back electromotive force diagrams are for a flux-switching electromagnetic drive with a new magnetic circuit and a conventional C-core stator flux-switching motor at 2000 rpm. Figure 9 The diagram shows the output torque of a flux-switching electromagnetic drive with a new magnetic circuit under 10A line current excitation and a conventional C-core stator flux-switching motor according to an embodiment of the present invention. Figure 8 This includes the back EMF of a new type of motor and the back EMF of a C-core motor. Figure 9 This includes the output torque of the new motor and the output torque of the C-core motor. Specifically, the creation of the new magnetic circuit increases the magnetic flux linkage of the coil. The drive with the new magnetic circuit proposed in this invention achieves a back electromotive force amplitude of 101.2V. Under 10A line current excitation, the output torque of the traditional C-core motor is 7.34Nm, while that of the new motor is 9.43Nm, an increase of 28.5%. The torque density of the traditional C-core motor is 3.55Nm / kg, while that of the new motor is 4.26Nm / kg, an increase of 20%. Furthermore, the torque ripple of the new motor is 5.8%, compared to 6.3% of the torque ripple of the traditional C-core motor, demonstrating an improvement in reducing torque ripple.

[0064] The technical solution of the present invention has been described above with reference to the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the scope of protection of the present invention is obviously not limited to these specific embodiments. Without departing from the principles of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the scope of protection of the present invention.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A flux-switching drive stator topology based on dual-sided permanent magnet coupling, characterized in that, include: The C-type iron core has spoke-shaped permanent magnets inside; Tooth-end auxiliary permanent magnets are disposed on both sides of the stator pole of the C-shaped iron core; A slotted auxiliary iron core is disposed on the outside of the toothed auxiliary permanent magnet to form a new magnetic circuit in conjunction with the toothed auxiliary permanent magnet, so that the new magnetic circuit passes through the stator pole splitting teeth that are not used during the magnetic flux switching process. The toothed auxiliary permanent magnet is magnetized tangentially, and the direction of magnetization is opposite to the tangential magnetization direction of the spoke-shaped permanent magnet. The magnetic flux path corresponding to the tooth-end auxiliary permanent magnet is such that the magnetic flux is emitted from the tooth-end auxiliary permanent magnet, flows through the other side of the stator pole splitting tooth, enters the rotor, and forms a closed loop. The rotor teeth are aligned with the stator pole splitting teeth, and the magnetic flux generated by the spoke-type permanent magnet and the tooth-end auxiliary permanent magnet is in the same direction. The magnetic flux path generated by the spoke-type permanent magnet and the magnetic flux path generated by the tooth-end auxiliary permanent magnet pass through both sides of the stator pole splitting tooth, respectively. The spoke-shaped permanent magnet has alternating tangential magnetization directions in the circumferential direction.

2. The flux switching drive stator topology based on dual-sided permanent magnet coupling according to claim 1, characterized in that, The C-shaped iron core is connected by a thin magnetic bridge to position the stator.

3. The flux switching drive stator topology based on dual-sided permanent magnet coupling according to claim 1, characterized in that, The magnetic flux path corresponding to the spoke-type permanent magnet is such that the magnetic flux originates from the spoke-type permanent magnet, flows through one side of the stator pole splitting teeth, and enters the rotor.

4. The flux switching drive stator topology based on dual-sided permanent magnet coupling according to claim 3, characterized in that, The magnetic flux path corresponding to the spoke-shaped permanent magnet is a closed loop.

5. The flux switching drive stator topology based on dual-sided permanent magnet coupling according to claim 1, characterized in that, The stator and rotor have different pole numbers.

6. The flux switching drive stator topology based on dual-sided permanent magnet coupling according to claim 1, characterized in that, It also includes windings, which are single-layer concentrated windings.

7. The flux switching drive stator topology based on dual-sided permanent magnet coupling according to claim 1, characterized in that, It also includes a rotor, which has a multi-salient pole structure.

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