Rotor core and rotor of an axial magnetic field motor

Abstract

The present invention provides a rotor core and a rotor of an axial magnetic field motor. The rotor core includes a support unit and a magnetic conduction unit made of different materials. The magnetic conduction unit is arranged on the support unit, and a permanent magnet mounting surface is formed on a side of the magnetic conduction unit facing away from the support unit. The magnetic conduction unit provides a magnetic conduction loop, while the support unit mainly serves as a mechanical force carrier of the overall rotor. It can be seen that most of the eddy currents induced by the rotor harmonic magnetic field are concentrated on the magnetic conduction unit, which can greatly reduce the heat loss of the support unit, while reducing the heat loss of the permanent magnet and even avoiding the risk of permanent magnet demagnetization, thereby improving the motor efficiency.

Description

Technical Field

[0001] The present invention relates to the field of axial magnetic field motors, and particularly to a rotor core and a rotor of an axial magnetic field motor. Background Art

[0002] A motor refers to an electromagnetic device that realizes the conversion or transmission of electrical energy based on the law of electromagnetic induction. Its main function is to generate a driving torque and serve as a power source for electrical appliances or various machines. The types of motors can be divided into radial magnetic field motors and axial magnetic field motors. The axial magnetic field motor, also known as a disc motor, has the characteristics of small volume, light weight, short axial dimension, and high power density, and can be widely used in electric vehicles, etc.

[0003] The rotor of the axial magnetic field motor includes a rotor core and a plurality of permanent magnets. The plurality of permanent magnets are fixed on the rotor core and arranged at circumferential intervals. At present, the whole rotor core is made of a magnetic conductive material. Since the permanent magnets directly face the stator core, the harmonic magnetic field in the air-gap magnetic field will generate an eddy current effect on the permanent magnets and the whole rotor core, thereby causing heat loss of the permanent magnets and the whole rotor core, and even causing the demagnetization of the permanent magnets, resulting in a decline in the performance of the motor or even the inability to operate. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a rotor core that combines two different materials, which can effectively reduce heat loss and reduce the risk of permanent magnet demagnetization, thereby improving the efficiency of the motor and the rotor of the axial magnetic field motor having the rotor core.

[0005] According to an object of the present invention, there is provided a rotor core of an axial magnetic field motor, including a support unit and a magnetic conductive unit made of different materials. The magnetic conductive unit is arranged on the support unit, and a permanent magnet mounting surface is formed on a side of the magnetic conductive unit facing away from the support unit.

[0006] As a preferred embodiment, the magnetic conductive unit includes a plurality of magnetic conductive plates, the plurality of magnetic conductive plates are arranged in a ring shape, and insulation is provided between adjacent two of the magnetic conductive plates.

[0007] As a preferred embodiment, the support unit includes a bottom plate, an inner step and an outer step. The inner step and the outer step protrude upward and are connected to the inner and outer edges of the bottom plate. The magnetic conductive plates are limited between the inner step and the outer step and are fixedly abutted on the bottom plate.

[0008] As a preferred embodiment, the inner step is recessed inward to form a recessed portion, and the permanent magnet is limited between the recessed portion and the outer step.

[0009] As a preferred embodiment, a protrusion is formed between two adjacent recessed portions, and a clamping recess for clamping the protrusion is provided on the magnetic conductive plate. The permanent magnet and the magnetic conductive plate are arranged staggeredly, and the mounting holes for connecting the pressing plate on the magnetic conductive plate are exposed.

[0010] As a preferred embodiment, the support unit further includes a plurality of reinforcing ribs. The reinforcing ribs are arranged on the bottom plate and are spaced from the magnetic conductive plate. The horizontal height of the reinforcing ribs is not higher than the permanent magnet mounting surface.

[0011] As a preferred embodiment, a plurality of gaps are formed in the reinforcing ribs.

[0012] As a preferred embodiment, insulating members are filled in the gaps.

[0013] As a preferred embodiment, the reinforcing ribs are opposite to the recessed portions, so that the permanent magnet and the magnetic conductive plate are arranged staggeredly, and the mounting holes for connecting the pressing plate on the magnetic conductive plate are exposed.

[0014] As a preferred embodiment, the magnetic conductive plate is integrally formed of a soft magnetic composite material or is formed by stacking a plurality of silicon steel sheets along the axial direction.

[0015] According to another object of the present invention, the present invention also provides a rotor, including the rotor core of the above embodiment. The rotor further includes a plurality of permanent magnets and a pressing plate. The plurality of permanent magnets are annularly arranged on the permanent magnet mounting surface of the magnetic conductive unit and are fixed by the pressing plate.

[0016] As a preferred embodiment, the pressing plate includes a ring and a plurality of support rods. The plurality of support rods are annularly and spacedly connected to the periphery of the ring. The ring is fixed on the support unit, and the support rods are fixed on the magnetic conductive unit, so that the permanent magnets are limited between the two support rods.

[0017] As a preferred embodiment, permanent magnet limiting surfaces are respectively formed on two sides in the circumferential direction of the permanent magnet. The permanent magnet limiting surfaces include a connected permanent magnet vertical surface and a permanent magnet inclined surface. Support rod limiting surfaces adapted to the permanent magnet limiting surfaces are respectively formed on two sides in the circumferential direction of the support rod. The support rod is fixed between two adjacent permanent magnets by pressing the permanent magnet limiting surfaces through the support rod limiting surfaces.

[0018] Compared with the prior art, the technical solution has the following advantages:

[0019] Since the permanent magnet is installed on the permanent magnet mounting surface of the magnetic conduction unit facing away from the support unit, the magnetic conduction unit provides a magnetic conduction loop and can be made of materials with high magnetic conductivity, low conductivity, and low hysteresis loss. The support unit mainly serves as the mechanical force carrier of the overall rotor and can be made of high-strength structural steel. It can be seen that most of the eddy currents induced by the rotor harmonic magnetic field are concentrated on the magnetic conduction unit, which can greatly reduce the heat loss of the support unit. Moreover, the conductivity of the support unit is very weak and the hysteresis loss is very small. Therefore, compared with the prior art where the same material is used as a whole, the overall heat loss of the rotor core composed of different materials can be greatly reduced, while reducing the heat loss of the permanent magnet and even avoiding the risk of permanent magnet demagnetization, thereby improving the motor efficiency.

[0020] The present invention will be further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic structural diagram of the rotor core of the axial magnetic field motor of the present invention;

[0022] Figure 2 is a schematic structural diagram of the first embodiment of the support unit of the present invention;

[0023] Figure 3 is a schematic structural diagram of the second embodiment of the support unit of the present invention;

[0024] Figure 4 is a schematic structural diagram of the third embodiment of the support unit of the present invention;

[0025] Figure 5 is a schematic structural diagram of the first embodiment of the magnetic conduction unit of the present invention;

[0026] Figure 6 is an exploded view of the first embodiment of the magnetic conduction unit of the present invention;

[0027] Figure 7 is a schematic structural diagram of the second embodiment of the magnetic conduction unit of the present invention;

[0028] Figure 8 is an exploded view of the second embodiment of the magnetic conduction unit of the present invention;

[0029] Figure 9 is a schematic structural diagram of the rotor of the axial magnetic field motor of the present invention;

[0030] Figure 10 is an exploded view of the first embodiment of the rotor of the axial magnetic field motor of the present invention;

[0031] Figure 11 is a partial schematic view of the first embodiment of the rotor of the axial magnetic field motor of the present invention;

[0032] Figure 12 It is an exploded view of the second embodiment of the rotor of the axial magnetic field motor according to the present invention;

[0033] Figure 13 It is a partial schematic view of the second embodiment of the rotor of the axial magnetic field motor according to the present invention;

[0034] Figure 14 It is a schematic structural view of the pressing plate according to the present invention. Specific embodiments

[0035] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations. The basic principles defined in the following description of the present invention can be applied to other implementation schemes, variant schemes, improvement schemes, equivalent schemes, and other technical schemes without departing from the spirit and scope of the present invention.

[0036] As Figure 1 shown, the rotor core 100 of the axial magnetic field motor includes a support unit 110 and a magnetic conduction unit 120 made of different materials. The magnetic conduction unit 120 is arranged on the support unit 110, and a permanent magnet mounting surface 1200 is formed on the side of the magnetic conduction unit 120 facing away from the support unit 110.

[0037] Since the permanent magnet 200 is mounted on the permanent magnet mounting surface 1200 of the magnetic conduction unit 120 facing away from the support unit 110, the magnetic conduction unit 120 provides a magnetic conduction path and can be made of materials with high magnetic conductivity, low conductivity, and low magnetic hysteresis loss. The support unit 110 mainly serves as the mechanical force carrier of the overall rotor and can be made of high-strength structural steel. Of course, the support unit 110 can provide a part of the magnetic conduction path, but it is less than that of the magnetic conduction unit 120. It can be seen that most of the eddy currents induced by the rotor harmonic magnetic field are concentrated on the magnetic conduction unit 120, which can greatly reduce the heat loss of the support unit 110. Moreover, the conductivity of the support unit 110 is very weak and the magnetic hysteresis loss is very small. Therefore, compared with the prior art using the same material as a whole, the overall heat loss of the rotor core 100 composed of different materials can be greatly reduced, while reducing the heat loss of the permanent magnet and even avoiding the risk of permanent magnet demagnetization, thereby improving the motor efficiency, especially suitable for the requirements of medium and high-speed operation of the motor.

[0038] As Figure 1 and Figure 2As shown, the support unit 110 includes a bottom plate 111, an inner step 112, and an outer step 113. The inner step 112 and the outer step 113 protrude upward and are connected to the inner and outer edges of the bottom plate 111. The magnetic conduction unit 120 is limited between the inner step 112 and the outer step 113 and is fixedly abutted on the bottom plate 111.

[0039] The bottom plate 111, the inner step 112, and the outer step 113 are all annular to adapt to the installation of the annular magnetic conduction unit 120. The horizontal heights of the inner step 112 and the outer step 113 are both higher than that of the magnetic conduction unit 120. It can be seen that the magnetic conduction unit 120 is embedded in the support unit 110. In this way, the permanent magnet 200 mounted on the permanent magnet mounting surface 1200 of the magnetic conduction unit 120 can also be limited by the inner step 112 and the outer step 113, which is not only simple and compact in structure, but also reasonably utilizes the installation space to ensure the stability and reliability among the support unit 110, the magnetic conduction unit 120, and the permanent magnet 200.

[0040] Reference Figures 1 to 4 As shown, the magnetic conduction unit 120 includes a plurality of magnetic conduction plates 121, and the plurality of magnetic conduction plates 121 are arranged in a ring on the bottom plate 111. The magnetic conduction plate 121 is trapezoidal. The upper base of the trapezoid of the magnetic conduction plate 121 is concave and correspondingly connected to the inner step 112. The lower base of the trapezoid of the magnetic conduction plate 121 is convex and correspondingly connected to the outer step 113. In addition, adjacent two magnetic conduction plates 121 are insulated from each other, and the insulation can be achieved through surface insulation treatment or by adding a reinforcing rib 114 between adjacent two magnetic conduction plates 121.

[0041] In one embodiment, an insulating layer is added to the surface of the magnetic conduction plate 121. When a plurality of magnetic conduction plates 121 are sequentially spliced to form the annular magnetic conduction unit 120, the magnetic conduction plates 121 are insulated from each other, and the magnetic conduction plates 121 are also insulated from the permanent magnet. Reference Figure 10 .

[0042] Furthermore, the inner step 112 is recessed inward to form a recessed portion 1121. A protruding portion 1122 is formed between adjacent two recessed portions 1121, and a clamping concave portion 1211 for clamping the protruding portion 1122 is provided on the magnetic conduction plate 121, specifically located at the middle position of the upper base of the trapezoid of the magnetic conduction plate 121. Reference Figure 2 And Figure 5 . By adopting the above structure, the circumferential displacement of the magnetic conduction plate 121 is prevented to ensure the stability of the connection. The lower part 11221 of the recessed portion is flush with the bottom plate 111. In this way, in addition to clamping the protruding portion 1122, the upper base of the trapezoid of the magnetic conduction plate 121 also abuts against the lower part 11221 of the recessed portion.

[0043] Further, the permanent magnet 200 can be limited between the recess 1121 and the outer step 113 to prevent separation during high-speed rotation of the rotor. Refer to Figure 11 . Since the engaging recess 1211 is located at the middle position of the upper bottom of the magnetic conductive plate 121, after the adjacent two protruding portions 1122 are respectively engaged with the magnetic conductive plate 121, the splicing gap between the two magnetic conductive plates 121 corresponds to the recess 1121 between the two protruding portions 1122. It can be seen that the permanent magnet 200 covers the splicing gap between the two magnetic conductive plates 121, so that the mounting hole 1212 in the middle of the magnetic conductive plate 121 is exposed for mounting the pressing plate 300. Refer to Figure 10 and Figure 11 . Preferably, the number of the permanent magnets 200 is the same as that of the magnetic conductive plates 121, and the center line of each permanent magnet 200 is aligned with the splicing gap between the adjacent two magnetic conductive plates 121.

[0044] In another embodiment, the support unit 110 further includes a plurality of reinforcing ribs 114. The reinforcing ribs 114 are arranged on the bottom plate 111 and are spaced from the magnetic conductive plate 121 to insulate the adjacent two magnetic conductive plates 121 from each other.

[0045] Further, the plurality of reinforcing ribs 114 are arranged at circumferential intervals and respectively extend and connect to the inner step 112 and the outer step 113. One magnetic conductive plate 121 is fixedly embedded between the adjacent two reinforcing ribs 114 to space the reinforcing rib 121 from the magnetic conductive plate 121. In addition, the horizontal height of the reinforcing rib 114 is not higher than the permanent magnet mounting surface 1200 to prevent the reinforcing rib 114 from protruding from the permanent magnet mounting surface 1200 and affecting the installation requirement of the flatness of the permanent magnet 200.

[0046] Furthermore, the inner step 112 is recessed inward to form a recess 1121 for limiting the permanent magnet 200 to prevent separation during high-speed rotation of the rotor. Refer to Figure 3 and Figure 13 . The lower part 11221 of the recess is flush with the upper surface of the reinforcing rib 114. When the upper surface of the reinforcing rib 114 is flush with the permanent magnet mounting surface 1200, the permanent magnet 200 abuts against the lower part 11221 of the recess, the reinforcing rib 114 and the permanent magnet mounting surface 1200 at the same time. Refer to Figure 3 and Figure 13 . At this time, the upper bottom of the trapezoidal magnetic conductive plate 121 is concave and abuts against the periphery of the convex inner step 112. Refer to Figure 7 and Figure 13 .

[0047] Furthermore, the reinforcing rib 114 is opposite to the recessed portion 1121, so that the permanent magnet 200 and the magnetic conductive plate 121 are staggered. Figure 13 In this way, the center line of each permanent magnet 200 is aligned with the center line between two adjacent magnetic conductive plates 121, so that the mounting hole 1212 in the middle of the magnetic conductive plate 121 is exposed for mounting the pressure plate 300. Figure 12 and Figure 13 .

[0048] In another embodiment, a plurality of slits 1141 are provided on the reinforcing rib 114 to reduce the requirements for electromagnetic loss. The size, shape and number of the slits 1141 can be set according to design requirements. For example, a plurality of slits 1141 are arranged on the reinforcing rib 114 at intervals along the circumference and are located on the upper surface where the reinforcing rib 114 is connected to the permanent magnet 114. In addition, the slits are filled with insulating members, such as insulating glue, to fully insulate the ribs on both sides of the slit 1141 and ensure the strength of the reinforcing rib 114 under the premise of reducing the requirements for electromagnetic loss.

[0049] The magnetic conductive plate 121 is formed of a soft magnetic composite material (SMC) in one piece, or the magnetic conductive plate 121 is formed by stacking a plurality of silicon steel sheets 1210 in the axial direction. Figures 5 to 8 The thickness of each silicon steel sheet 1210 may be unequal to ensure the flatness requirement of the permanent magnet installation surface.

[0050] To summarize, since the permanent magnet 200 is installed on the permanent magnet mounting surface 1200 of the magnetic unit 120 away from the support unit 110, the magnetic unit 120 provides a magnetic circuit and can be composed of a material with high magnetic conductivity, low electrical conductivity, and low hysteresis loss. The support unit 110 mainly serves as a mechanical force carrier of the entire rotor and can be made of high-strength structural steel material. It can be seen that most of the eddy currents induced by the rotor harmonic magnetic field are concentrated on the magnetic unit 120, which can greatly reduce the heat loss of the support unit 110. Moreover, the electrical conductivity of the support unit 110 is very weak and the hysteresis loss is very small. Therefore, compared with the prior art that uses the same material as a whole, the heat loss of the rotor core 100 composed of different materials can be greatly reduced as a whole, while reducing the heat loss of the permanent magnet and even avoiding the risk of demagnetization of the permanent magnet, thereby improving the efficiency of the motor.

[0051] like Figures 9 to 14As shown, the rotor includes the rotor core 100 of the above embodiment. The rotor 100 further includes a plurality of permanent magnets 200 and a pressing plate 300. The plurality of permanent magnets 200 are arranged in a ring on the permanent magnet mounting surface 1200 of the magnetic conduction unit 120 and are fixed by the pressing plate 300.

[0052] Since the rotor adopts the rotor core 100 of the above embodiment, the beneficial effects of the rotor can refer to the rotor core 100 of the above embodiment. The permanent magnet 200 can be formed by stacking a plurality of laminations along the radial direction, or by pressing soft magnetic materials. It is trapezoidal, and the upper base of the trapezoidal permanent magnet 200 is concave, and the lower base of the trapezoidal permanent magnet 200 is convex. Refer to Figure 9 .

[0053] As Figure 10 , Figure 12 and Figure 14 shown, the pressing plate 300 includes a ring 310 and a plurality of support rods 320. The plurality of support rods 320 are annularly and spacedly connected to the periphery of the ring 310. The ring 310 is fixed to the support unit 110, and the support rods 320 are fixed to the magnetic conduction unit 120 so that the permanent magnet 200 is limited between the two support rods 320.

[0054] Refer to Figure 2 , Figure 10 , Figure 11 and Figure 14 shown, the ring 310 is fixed to the inner step 112, and the bottom 11222 of the recessed part is flush with the periphery of the ring 310. In this way, the upper base of the trapezoidal permanent magnet 200 abuts against the bottom 11222 of the recessed part and the ring 310 respectively, and the lower base of the trapezoidal permanent magnet 200 abuts against the outer step 113. The horizontal heights of the pressing plate 300 and the outer step 113 are both lower than the horizontal height of the permanent magnet 200, so that the upper surface of the permanent magnet 200 protrudes relative to the pressing plate 300 and the rotor core 100 to form an air gap surface with the rotor air gap. Preferably, the height of the outer step 113 is not higher than half of the height of the permanent magnet 200.

[0055] In addition, a ring mounting hole 311 is provided on the ring 310, and an inner step mounting hole 1123 opposite to the ring mounting hole 311 is provided on the inner step 112, and they are locked by screws 400. Refer to Figure 2 , Figure 3 , Figure 9 and Figure 14 .

[0056] Similarly, refer to Figure 3 , Figures 12 to 14, the bottom 11222 of the recess is flush with the periphery of the ring 310, so that the upper bases of the trapezoidal permanent magnets 200 respectively abut against the bottom 11222 of the recess and the ring 310, and the lower bases of the trapezoidal permanent magnets 200 abut against the outer step 113.

[0057] As can be seen from the foregoing, the support rod 320 is fixed on the magnetic conduction sheet 121 of the magnetic conduction unit 120 and is located on the center line of the magnetic conduction sheet 121. In this way, the support rod hole 321 on the support rod 320, the installation hole 1212 in the middle of the magnetic conduction sheet 121, and the bottom plate installation hole 1111 on the bottom plate 111 are aligned, and then locked by screws 400. Refer to Figure 2 , Figure 3 , Figure 9 , Figure 11 , Figure 13 and Figure 14 . The holes through which the screws 400 pass can be countersunk holes so that the screws 400 are embedded to prevent the screws 400 from protruding outward and increasing the overall size.

[0058] As Figure 11 , Figure 13 and Figure 14 described, permanent magnet limiting surfaces 210 are respectively formed on both circumferential sides of the permanent magnet 200, and support rod limiting surfaces 322 are respectively formed on both circumferential sides of the support rod 320. The support rod 320 is fixed between two adjacent permanent magnets 200 by pressing the permanent magnet limiting surfaces 210 with the support rod limiting surfaces 322 to prevent axial displacement of the permanent magnets 200.

[0059] The permanent magnet limiting surface 210 includes a connected permanent magnet vertical surface 212 and a permanent magnet inclined surface 211. The permanent magnet vertical surface 212 and the permanent magnet inclined surface 211 are sequentially connected between the lower surface and the upper surface of the permanent magnet 200. The lower surface of the permanent magnet 200 is fixedly abutted against the magnetic conduction sheet 121, and the upper surface of the permanent magnet 200 is an air gap surface. In addition, the permanent magnet vertical surface 212 is perpendicular to the lower surface and the upper surface of the permanent magnet 200 respectively, and its size is much smaller than the size of the permanent magnet inclined surface 211.

[0060] Refer to Figure 14 , the support rod limiting surface 322 includes a connected support rod vertical surface 3222 and a support rod inclined surface 3221. The support rod vertical surface abuts and fits with the permanent magnet vertical surface 212, and the support rod inclined surface 3221 abuts and fits with the permanent magnet inclined surface 211 to ensure the fixing ability of the pressing plate 300 to the permanent magnet 200.

[0061] The embodiments described above are only used to illustrate the technical idea and characteristics of the present invention. The purpose is to enable those skilled in the art to understand the content of the present invention and implement it accordingly. The scope of the patent of the present invention cannot be limited only by these embodiments. That is, any equivalent changes or modifications made in accordance with the spirit disclosed in the present invention still fall within the scope of the patent of the present invention.

Claims

1. A rotor core (100) of an axial magnetic field motor, characterized in that, It comprises a support unit (110) and a magnetic conductive unit (120) made of different materials, wherein the magnetic conductive unit (120) is arranged on the support unit (110), and a side of the magnetic conductive unit (120) facing away from the support unit (110) forms a permanent magnet mounting surface (1200); The support unit (110) comprises a bottom plate (111), an inner step (112) and an outer step (113); the inner step (112) and the outer step (113) protrude upward and are connected to inner and outer edges of the bottom plate (111); the magnetic conductive unit (120) comprises a plurality of magnetic conductive plates (121); the magnetic conductive plates (121) are limited between the inner step (112) and the outer step (113), and are abutted and fixed on the bottom plate (111); The inner step (112) is recessed inward to form a recessed portion (1121), a protruding portion (1122) is formed between two adjacent recessed portions (1121), and a snap-fitting recessed portion (1211) for snapping the protruding portion (1122) is provided on the magnetic conductive plate (121), the magnetic conductive plate (121) and the permanent magnet (200) are staggered, and a mounting hole (1212) on the magnetic conductive plate (121) for connecting the pressure plate (300) is exposed.

2. The rotor core (100) of the axial magnetic field motor according to claim 1, characterized in that, A plurality of the magnetic conductive plates (121) are arranged in a ring shape, and two adjacent magnetic conductive plates (121) are insulated from each other.

3. The rotor core (100) of the axial magnetic field motor according to claim 1, characterized in that, The permanent magnet (200) is located between the recessed portion (1121) and the outer step (113).

4. The rotor core (100) of the axial magnetic field motor according to claim 1, characterized in that, The support unit (110) further comprises a plurality of reinforcing ribs (114), wherein the reinforcing ribs (114) are arranged on the bottom plate (111) and are spaced apart from the magnetic conductive plate (121), and the horizontal height of the reinforcing ribs (114) is not higher than the permanent magnet mounting surface (1200).

5. The rotor core (100) of the axial magnetic field motor according to claim 4, characterized in that, The reinforcing rib (114) is provided with a plurality of slits (1141).

6. The rotor core (100) of the axial magnetic field motor according to claim 5, characterized in that, The gap (1141) is filled with an insulating member.

7. The rotor core (100) of the axial magnetic field motor according to claim 4, characterized in that, The reinforcing rib (114) is opposite to the recessed portion (1121), so that the permanent magnet (200) and the magnetic conductive plate (121) are arranged in a staggered manner, and the mounting hole (1212) on the magnetic conductive plate (121) for connecting the pressing plate (300) is exposed.

8. The rotor core (100) of the axial magnetic field motor according to claim 1, characterized in that, The magnetic conductive plate (121) is formed of a soft magnetic composite material in one piece, or is formed by stacking a plurality of silicon steel sheets (1210) in the axial direction.

9. A rotor, characterized in that, The rotor core (100) comprises a rotor core (100) as claimed in any one of claims 1 to 8, wherein the rotor (100) further comprises a plurality of permanent magnets (200) and a pressure plate (300), wherein the plurality of permanent magnets (200) are arranged in a ring shape on a permanent magnet mounting surface (1200) of the magnetic conductive unit (120) and are fixed by the pressure plate (300).

10. The rotor according to claim 9, characterized in that, The pressing plate (300) includes a circular ring (310) and a plurality of support rods (320). The plurality of support rods (320) are annularly and spacedly connected to the periphery of the circular ring (310). The circular ring (310) is fixed on the support unit (110), and the support rods (320) are fixed on the magnetic conduction unit (120) so that the permanent magnet (200) is limited between the two support rods (320).

11. The rotor according to claim 10, characterized in that, On both circumferential sides of the permanent magnet (200), permanent magnet limiting surfaces (210) are respectively formed. The permanent magnet limiting surfaces (210) include connected permanent magnet vertical surfaces (212) and permanent magnet inclined surfaces (211). On both circumferential sides of the support rod (320), the support rod limiting surfaces (322) adapted to the permanent magnet limiting surfaces (210) are respectively formed. The support rod (320) is fixed between two adjacent permanent magnets (200) by pressing the permanent magnet limiting surfaces (210) through the support rod limiting surfaces (322).

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