Permanent magnet motor and rotor thereof

Abstract

The utility model provides a kind of permanent magnet motor and its rotor, rotor includes: rotor core, multiple magnetic steel slot groups are formed on the rotor core along its circumferential direction, each group of the magnetic steel slot group includes at least one layer of magnetic steel slot, each layer of magnetic steel slot includes first magnetic steel slot and second magnetic steel slot;Magnetic steel, the magnetic steel is respectively installed in the first magnetic steel slot and the second magnetic steel slot, and each the magnetic steel is divided into multiple sub-magnetic steels along first direction, and the center of at least part of the sub-magnetic steel is not located on the same center line, the center line is straight line or circular arc line.The utility model can segment and respectively arrange design to each layer of magnetic steel, realize more varied magnetic steel arrangement mode, improve motor electromagnetic design optimization upper limit, to realize better motor performance.

Description

Technical Field

[0001] This utility model belongs to the field of permanent magnet motor technology, and in particular relates to a permanent magnet motor with a novel rotor topology and its rotor. Background Technology

[0002] In the electromagnetic design of permanent magnet motors, the rotor topology is extremely critical. The interaction of the magnetic fields between the stator and rotor directly affects torque output and torque ripple. Different topologies significantly alter the distribution of the fundamental and harmonic magnetic fields, thus impacting the motor's output torque stability, operating noise, and vibration performance. A well-designed topology can optimize the magnetic circuit to achieve superior electromagnetic performance at a lower cost, thereby improving the motor's overall efficiency and power density.

[0003] Currently, the rotor topologies widely used in motor electromagnetic design are mainly single-V, double-V, V-, and C-type. However, these traditional structures have significant limitations. They have relatively few optimization variables, resulting in limited optimization potential and making it difficult to meet the growing demand for high-performance motor designs. Consequently, progress in rotor topology optimization within the industry has gradually stagnated.

[0004] In recent years, the three-V structure has emerged, which, while enriching optimization features and providing new ideas for rotor topology optimization to some extent, still has significant drawbacks. Its fixed and singular magnet arrangement position greatly limits further performance optimization. Because the magnet arrangement position cannot be flexibly adjusted, it is difficult to find a globally optimal solution during electromagnetic design optimization, thus failing to fully realize the potential of the three-V structure.

[0005] Therefore, it is particularly urgent and necessary to propose an innovative rotor topology. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a permanent magnet motor and its rotor to solve the problems of few optimization variables and low upper limit in the prior art, thereby improving the electromagnetic design performance of the motor.

[0007] To achieve the above and other related objectives, this utility model proposes a rotor for a permanent magnet motor, comprising:

[0008] A rotor core, wherein a plurality of magnetic slot groups are formed along its circumference, each group of magnetic slot groups includes at least one layer of magnetic slots, and each layer of magnetic slots includes a first magnetic slot and a second magnetic slot.

[0009] The magnets are respectively installed in the first magnet slot and the second magnet slot, and each magnet is divided into multiple sub-magnets along a first direction, and the centers of at least some of the sub-magnets are not located on the same center line, wherein the center line is a straight line or an arc.

[0010] In one embodiment of this utility model, the first magnetic steel groove and the second magnetic steel groove are symmetrically distributed about the axis of symmetry d, and the first magnetic steel groove and the second magnetic steel groove are divided into multiple sub-magnetic steel grooves along their extension direction. Each sub-magnetic steel groove contains a sub-magnet, and adjacent sub-magnetic steel grooves are staggered to form a stepped structure, which restricts the position of the magnetic steel groove.

[0011] In one embodiment of this utility model, within the same magnet groove, at least some of the sub-magnets in the multiple sub-magnets have different lengths and / or widths in their cross-sections.

[0012] In one embodiment of this utility model, within the same magnet groove, multiple sub-magnets have the same angle with the axis of symmetry d.

[0013] In one embodiment of the present invention, along the radial direction of the rotor from the outside to the inside, each group of magnet slots includes at least a first magnet slot layer and a second magnet slot layer, and the angle between the magnet in each magnet slot layer and the axis of symmetry d gradually decreases.

[0014] In one embodiment of this utility model, the angle between the magnet in the first magnet groove layer and the axis of symmetry d is in the range of 55° to 90°, and the angle between the magnet in the second magnet groove layer and the axis of symmetry d is in the range of 35° to 70°.

[0015] In one embodiment of this utility model, the first and second magnetic slots of each layer of magnetic slots are distributed in a V-shaped structure, with the V-shaped openings facing the outer diameter of the rotor.

[0016] In one embodiment of this utility model, the number of sub-magnets in the magnet slots of different layers is different along the radial direction of the rotor from the outside to the inside.

[0017] In one embodiment of this utility model, along the radial direction of the rotor from the outside to the inside, the number of sub-magnet segments in the magnet slots of different layers gradually increases.

[0018] This utility model also proposes a permanent magnet motor, comprising: a rotor and a stator of a permanent magnet motor as described in any of the above embodiments, wherein the stator is arranged in a ring around the outer periphery of the rotor.

[0019] This utility model proposes a permanent magnet motor and its rotor, which has the following beneficial effects:

[0020] This invention significantly increases the number of optimization variables by segmenting and arranging each layer of magnets separately. For example, the number of magnet segments in each magnet slot, the size of each segment, its center position, and its angle with the d-axis can all be used as independent optimization variables. Based on the improvement of the double-V structure, the novel topology proposed in this invention can overcome the optimization bottleneck of traditional structures, enabling the electromagnetic design of the motor to achieve a higher performance level. Simulation results show that compared with the traditional double-V structure, the peak torque is increased by 2.16%, and the peak power is increased by 1.54%.

[0021] This invention effectively reduces motor torque ripple by optimizing the arrangement of magnets. Specifically, the 24th-order peak torque ripple is reduced by 6.9%, and the 48th-order peak torque ripple is reduced by 10.53%. This reduction in torque ripple makes the motor run more smoothly, reduces vibration and noise, and improves the motor's reliability and service life.

[0022] The novel rotor topology of this invention optimizes the magnetic field distribution and enhances the motor's power output capability. The increased peak torque and peak power enable the motor to output greater power within the same volume and weight, thus improving the motor's power density. This is of great significance for applications such as electric vehicles and industrial automation equipment, which have high requirements for motor power density.

[0023] This invention allows for segmentation and separate arrangement of each layer of magnets, making the magnet arrangement more flexible and diverse. This flexibility provides motor designers with more optimization space, allowing them to flexibly adjust the magnet arrangement scheme according to different design goals and performance requirements.

[0024] The magnet arrangement proposed in this invention is not only applicable to double-layer magnets, but can also be extended to single-layer, triple-layer, or even multi-layer magnet applications. Furthermore, this structure is not only suitable for 8-pole, 48-slot motors, but can also be extended to permanent magnet motors with other pole-slot configurations. This broad applicability allows this invention to leverage its advantages in various motor designs, meeting the needs of different application scenarios.

[0025] In summary, the novel rotor topology proposed in this invention achieves significant technical improvements in terms of optimized variables, electromagnetic performance, design flexibility, and overall performance. These improvements not only solve the bottleneck problems in existing technologies but also provide new ideas and methods for the design and manufacturing of permanent magnet motors, possessing significant application value and market prospects. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a partial schematic diagram of the rotor in one embodiment of the present invention.

[0028] Figure 2 for Figure 1 A partial schematic diagram.

[0029] Figure 3 The external characteristic curves are shown for the rotor magnet arrangement and the double-V rotor magnet arrangement.

[0030] Figure 4 Torque pulsation spectrum diagrams for rotor magnet arrangement and double V rotor magnet arrangement structures. Detailed Implementation

[0031] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0032] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0033] Please see Figure 1 and Figure 2As shown, the purpose of this utility model is to provide a permanent magnet motor and its rotor to solve the problems of limited optimization variables and low upper limits in the existing technology, thereby improving the electromagnetic design performance of the motor. Specifically, the rotor of the permanent magnet motor includes a rotor core 11 and magnets 12. Multiple magnet slot groups are formed on the rotor core 11 along its circumference. Each magnet slot group includes at least one layer of magnet slots, and each layer of magnet slots includes a first magnet slot 111 and a second magnet slot 112. Preferably, the first magnet slot 111 and the second magnet slot 112 are symmetrically distributed about the axis of symmetry d. The magnets are respectively installed in the first magnet slot 111 and the second magnet slot 112, and each magnet 12 is divided into multiple sub-magnets 121 along a first direction X, and the centers of at least some of the sub-magnets 121 are not located on the same center line, where the center line is a straight line or an arc. For example, when the rotor topology has V-shaped magnets, the centers of at least some of the sub-magnets 121 are not located on the same straight line; when it is a C-shaped magnet, the centers of at least some of the sub-magnets 121 are not located on the same arc. Taking V-shaped magnets as an example, the rotor core can be made of stacked silicon steel sheets with high permeability to reduce eddy current losses and hysteresis losses. The magnet slots are evenly distributed along the circumference of the rotor core, and each set of magnet slots corresponds to one magnetic pole. For example, in an 8-pole rotor, 8 sets of magnet slots are evenly distributed along the circumference. The first magnet slot 111 and the second magnet slot 112 of each layer of magnet slots are symmetrically distributed about the d-axis to ensure the symmetry and stability of the magnetic field. The magnets use high-performance permanent magnet materials, such as neodymium iron boron, to provide a strong magnetic field. The magnets are divided into multiple sub-magnets along their length, which can be achieved through precision machining. For example, a long strip of magnet can be cut into multiple segments along its length, and the length of each sub-magnet can be designed according to actual needs. Adjacent sub-magnets 121 are installed at a certain distance apart, so that the centers of at least some of the sub-magnets 121 are not on the same straight line, thereby optimizing the magnetic field distribution and reducing torque pulsation.

[0034] Please see Figure 1 and Figure 2As shown, in this embodiment, the magnet channel is divided into multiple sub-magnetic channels along its extension direction. Each sub-magnetic channel contains a sub-magnet 121, and adjacent sub-magnetic channels 121 are staggered to form a stepped structure 101. The stepped structure 101 restricts the position of the magnet channel. In specific implementation, the magnet channel can be processed into multiple sub-magnetic channels by die stamping. By designing a dedicated die, the required shape and size of the magnet channel can be precisely stamped, including the division and staggering of the sub-magnetic channels. The length and width of the sub-magnetic channels can be designed according to the size of the sub-magnet to ensure that the sub-magnet can fit tightly in the sub-magnetic channel. Adjacent sub-magnetic channels are staggered to form the stepped structure 101. The stepped structure 101 can adopt a stepped design, so that each sub-magnetic channel has a height difference in the axial direction, thereby forming a step. This stepped structure 101 can restrict the movement of the magnet in the tangential and radial directions, improving the stability of the magnet installation.

[0035] Please see Figure 1 and Figure 2 As shown, in this embodiment, at least some of the sub-magnets 121 within the same magnet slot have different lengths and / or widths in their cross-sections. In actual manufacturing, the cross-sectional areas of the sub-magnets within the same magnet slot can be differentiated according to the electromagnetic design requirements of the motor, i.e., the length and / or width of their cross-sections can be differentiated. For example, within a magnet slot, the sub-magnets near the rotor surface can be designed with a larger cross-sectional area to enhance the surface magnetic field strength; while the sub-magnets near the rotor center can be designed with a smaller cross-sectional area to optimize the internal magnetic field distribution. The difference in cross-sectional area can be achieved by changing the length and / or width of the sub-magnet's cross-section. During processing, precision molds can be used to press or cut the magnets to obtain sub-magnets with different cross-sectional areas. During installation, sub-magnets with different cross-sectional areas are sequentially installed into the magnet slot according to the design requirements, ensuring a tight fit while leaving appropriate gaps for adjustment and fixation. In this way, more flexible magnetic field adjustment can be achieved to meet the electromagnetic performance requirements under different operating conditions.

[0036] Please see Figure 1 and Figure 2 As shown, in this embodiment, within the same magnet slot, the angles between the multiple magnet segments 121 and the symmetry axis d are the same. In implementation, the shape and position of the magnet slot are first determined to form a specific angle with the symmetry axis d. For example, during the design phase, the optimal angle is calculated using electromagnetic simulation software, and then the shape of the magnet slot is designed based on this angle. The magnet slot can adopt a V-shape or other suitable shape to ensure that the angles between the multiple magnet segments 121 and the d-axis are consistent after installation. This results in a more uniform magnetic field distribution, improving the motor's performance and efficiency.

[0037] Please see Figure 1 and Figure 2 As shown, in this embodiment, along the radial direction of the rotor from the outside to the inside, each group of magnet slots includes at least a first magnet slot layer 201 and a second magnet slot layer 202. The angle between the magnets in each magnet slot layer and the axis of symmetry d gradually decreases. During the design phase, the angles of different magnet slot layers are determined based on the electromagnetic performance requirements and magnetic field distribution characteristics of the motor. Generally, the outer magnet slot (first magnet slot layer) has a larger angle with the d-axis, while the inner magnet slot (second magnet slot layer) has a smaller angle. Specifically, the angle between the magnets in the first magnet slot layer 201 and the axis of symmetry d ranges from 55° to 90°, and the angle between the magnets in the second magnet slot layer 202 and the axis of symmetry d ranges from 35° to 70°. In practical applications, a larger included angle is chosen for the first magnet slot layer. This allows the outer magnets to have a larger magnetic field coverage in the radial direction, enhancing the motor's starting torque and low-speed performance. For the second magnet slot layer, a smaller included angle is chosen, making the magnetic field of the inner magnets more concentrated inside the rotor, optimizing the motor's high-speed performance and reducing torque ripple. The optimized angle design in this invention allows the magnetic field to gradually change in the radial direction, optimizing the magnetic field distribution and improving the motor's efficiency and power density.

[0038] Please see Figure 1 and Figure 2 As shown, in this embodiment, the first and second magnet slots in each layer of magnet slots are distributed in a V-shape, with the V-shaped openings facing the outer diameter of the rotor. The V-shaped structure, designed to guide magnetic flux flow, enhances the magnetic field strength on the rotor surface and improves the motor's power output. Specialized machining techniques, such as die stamping, wire cutting, or laser cutting, can be used to precisely machine the V-shaped magnet slots. During magnet installation, the magnets are tightly fitted within the V-shaped slots to ensure good contact between the magnets and the slot walls, thereby reducing magnetic resistance and improving magnetic field conduction efficiency.

[0039] Please see Figure 1 and Figure 2As shown, in this embodiment, the number of sub-magnet segments 121 in different layers of magnet slots varies along the rotor radial direction from the outside to the inside. During the design phase, the number of sub-magnet segments in different layers of magnet slots is determined based on the electromagnetic performance requirements and magnetic field distribution characteristics of the motor. For example, for the first magnet slot layer 201, the number of sub-magnet segments 121 should be 2 to 4; for the second magnet slot layer 202, the number of sub-magnet segments 121 should be 3 to 6. In this embodiment, the number of sub-magnet segments in different layers of magnet slots gradually increases along the rotor radial direction from the outside to the inside. In implementation, the number of sub-magnet segments in each layer of magnet slots is increased sequentially from the outer radial direction of the rotor inwards. For example, the outermost magnet slot has 2 sub-magnet segments, the middle layer has 3 segments, the inner layer has 4 segments, and so on. This design allows the magnetic field to be gradually refined in the radial direction, better adapting to the changing magnetic field requirements inside the motor. In this way, the number of sub-magnetic segments in different layers of magnet slots can be differentiated, optimizing the magnetic field distribution of the motor and improving its performance and efficiency.

[0040] Please see Figure 1 and Figure 2 As shown in this embodiment, the present invention also proposes a permanent magnet motor, including a rotor and a stator. The stator is arranged in a ring around the outer periphery of the rotor, and the rotor includes the rotor of the permanent magnet motor as described in the above embodiment. To avoid repetition, it will not be described again here.

[0041] Please see Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown in this embodiment, in a specific implementation, an 8-pole 48-slot motor is used as an example to illustrate the improvement effect of this utility model on electromagnetic design. The novel rotor topology (separately arranged magnets) proposed in this utility model is compared with the traditional double-V structure (traditional double-V arrangement) with the same magnet angle and magnet quantity to highlight the innovation and technical advantages of this utility model. Figure 3 The figure shows the external characteristic curves of rotor magnets with separate and double-V rotor magnet arrangements. Figure 4 The torque pulsation spectrum diagrams for rotor magnet arrangement and double V rotor magnet arrangement are shown in Table 1. The simulation performance of the two motors under the same boundary conditions is compared.

[0042] Table 1 Comparison of various performance characteristics between separate magnet arrangements and double-V rotor magnet arrangements.

[0043] Peak torque / Nm 288.6 282.5 +2.16％ Peak power / kW 217.9 214.6 +1.54％ 24th order torque ripple / Nm 2.7 2.9 -6.90％ 48th order torque ripple / Nm 3.4 3.8 -10.53％

[0044] As shown in Table 1, the novel rotor topology proposed in this invention is an optimized improvement upon the double-V structure. Specifically, by segmenting the magnets in each layer and employing a unique arrangement design, a more diverse and refined magnet arrangement is achieved. This innovative arrangement method effectively raises the optimization ceiling of the motor's electromagnetic design, resulting in significant improvements in key performance indicators such as power, torque, and electromagnetic excitation. Compared to the traditional double-V arrangement, under the same boundary conditions, the rotor arrangement of this invention increases peak torque by 2.16%, peak power by 1.54%, reduces 24th-order peak torque ripple by 6.9%, and reduces 48th-order peak operating torque pulsation by 10.53%. These data fully demonstrate the significant effect of this invention in optimizing motor performance.

[0045] It is worth noting that the magnet arrangement scheme of this utility model has wide applicability. It is not only suitable for double-layer magnet structures, but can also be flexibly applied to single-layer, triple-layer, and even multi-layer magnet scenarios. This means that the scheme can be adjusted and expanded according to actual needs to meet the requirements of different motor designs. Furthermore, the magnet arrangement method proposed in this utility model is not limited to 8-pole 48-slot motors, but can also be extended to permanent magnet motors with other pole-slot combinations. This wide applicability makes this utility model of significant application value in the field of motor design.

[0046] Furthermore, this invention allows for the individual selection of the coercivity and remanence of each magnet segment according to specific requirements. This provides greater flexibility in motor design, enabling customized selection of magnet parameters based on different application scenarios and performance requirements to achieve optimized electromagnetic performance. This flexible design philosophy allows this invention to provide more precise solutions when facing diverse design needs.

[0047] This invention proposes a permanent magnet motor and its rotor. By segmenting and arranging each layer of magnets separately, the number of optimization variables is significantly increased. For example, the number of magnet segments in each magnet slot, the size of each sub-magnet, its center position, and its angle with the d-axis can all be used as independent optimization variables. Based on the improvement of the double-V structure, the novel topology proposed in this invention can overcome the optimization bottleneck of traditional structures, enabling the motor's electromagnetic design to achieve a higher performance level. Simulation results show that compared with the traditional double-V structure, the peak torque is increased by 2.16%, and the peak power is increased by 1.54%.

[0048] This invention proposes a permanent magnet motor and its rotor, which effectively reduces torque ripple by optimizing the arrangement of the magnets. Specifically, the 24th-order peak torque ripple is reduced by 6.9%, and the 48th-order peak torque ripple is reduced by 10.53%. This reduction in torque ripple makes the motor run more smoothly, reduces vibration and noise, and improves the motor's reliability and service life.

[0049] This invention proposes a permanent magnet motor and its rotor. The novel rotor topology optimizes the magnetic field distribution, enhancing the motor's power output capability. The increased peak torque and peak power enable the motor to output greater power within the same volume and weight, thus improving its power density. This is of great significance for applications such as electric vehicles and industrial automation equipment, which require high motor power density.

[0050] This invention proposes a permanent magnet motor and its rotor, which allows for segmentation and separate arrangement of each layer of magnets, making the magnet arrangement more flexible and diverse. This flexibility provides motor designers with more optimization space, allowing them to flexibly adjust the magnet arrangement scheme according to different design goals and performance requirements.

[0051] This invention proposes a permanent magnet motor and its rotor. The magnet arrangement is not only applicable to double-layer magnets, but can also be extended to single-layer, triple-layer, or even multi-layer magnet configurations. Furthermore, this structure is not only suitable for 8-pole, 48-slot motors, but can also be extended to permanent magnet motors with other pole-slot combinations. This broad applicability allows this invention to leverage its advantages in various motor designs, meeting the needs of different application scenarios.

[0052] In summary, the novel rotor topology proposed in this invention achieves significant technical improvements in terms of optimized variables, electromagnetic performance, design flexibility, and overall performance. These improvements not only solve the bottleneck problems in existing technologies but also provide new ideas and methods for the design and manufacturing of permanent magnet motors, possessing significant application value and market prospects.

[0053] The above-described embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model, and should all be included within the protection scope of this utility model.

[0054] Apart from the technical features described in the specification, the other technical features are known to those skilled in the art. To highlight the innovative features of this utility model, the other technical features will not be described in detail here.

Claims

1. A rotor for a permanent magnet motor, characterized in that, include: A rotor core, wherein a plurality of magnetic slot groups are formed along its circumference, each group of magnetic slot groups includes at least one layer of magnetic slots, and each layer of magnetic slots includes a first magnetic slot and a second magnetic slot. The magnets are respectively installed in the first magnet slot and the second magnet slot, and each magnet is divided into multiple sub-magnets along a first direction, and the centers of at least some of the sub-magnets are not located on the same center line, wherein the center line is a straight line or an arc.

2. The rotor of the permanent magnet motor according to claim 1, characterized in that, The first and second magnetic steel channels are symmetrically distributed about the axis of symmetry d, and the first and second magnetic steel channels are divided into multiple sub-magnetic steel channels along their extension direction. Each sub-magnetic steel channel contains a sub-magnet, and adjacent sub-magnetic steel channels are staggered to form a stepped structure, which restricts the position of the magnetic steel channels.

3. The rotor of the permanent magnet motor according to claim 2, characterized in that, Within the same magnet slot, at least some of the sub-magnets in the multiple sub-magnets have different lengths and / or widths in their cross-sections.

4. The rotor of the permanent magnet motor according to claim 2, characterized in that, Within the same magnetic steel groove, multiple sub-magnetic steel sections have the same angle with the axis of symmetry d.

5. The rotor of the permanent magnet motor according to claim 4, characterized in that, Along the radial direction of the rotor from the outside to the inside, each group of magnet slots includes at least a first magnet slot layer and a second magnet slot layer, and the angle between the magnets in each magnet slot layer and the axis of symmetry d gradually decreases.

6. The rotor of the permanent magnet motor according to claim 4, characterized in that, The angle between the magnet in the first magnet groove layer and the axis of symmetry d-axis ranges from 55° to 90°, and the angle between the magnet in the second magnet groove layer and the axis of symmetry d-axis ranges from 35° to 70°.

7. The rotor of the permanent magnet motor according to claim 6, characterized in that, The first and second magnetic slots of each layer of magnetic slots are distributed in a V-shape, with the V-shaped openings facing the outer diameter of the rotor.

8. The rotor of the permanent magnet motor according to claim 1, characterized in that, Along the radial direction of the rotor from the outside to the inside, the number of sub-magnets in the magnet slots of different layers is different.

9. The rotor of the permanent magnet motor according to claim 8, characterized in that, Along the radial direction of the rotor from the outside to the inside, the number of sub-magnet segments in the magnet slots of different layers gradually increases.

10. A permanent magnet motor, characterized in that, include: The rotor and stator of the permanent magnet motor as described in any one of claims 1 to 9, wherein the stator is arranged in a ring around the outer periphery of the rotor.

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