Rotor core, rotor and motor

Abstract

The rotor iron core, the rotor and the motor provided by the utility model not only simplify the manufacturing process, reduce the manufacturing cost and realize the efficient and stable fixation of the permanent magnets, but also optimize the space utilization rate of the surface of the rotor, reduce the air gap limitation, reduce the magnetic leakage phenomenon and facilitate the improvement of the power density and the performance of the motor. The rotor iron core comprises a plurality of punching sheets; the punching sheet is of an annular structure, the outer edge of the punching sheet is provided with at least one clamping unit, and the clamping unit is provided with a clamping groove. For the punching sheets, a preset interval is formed between the adjacent clamping units in the circumferential direction of the rotor iron core; wherein the plurality of punching sheets are stacked in a first direction, a plurality of connecting channels are formed based on the clamping units on the plurality of punching sheets, the connecting channels are configured to be suitable for clamping permanent magnets, and a preset interval is formed between every two adjacent connecting channels; and the punching sheets on which the clamping units forming the two adjacent connecting channels are located are not adjacent in the first direction.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technology field especially a rotor iron core, rotor and motor. BACKGROUND

[0002] Surface-mounted Permanent Magnet Synchronous Motor (SPMSM) has become an important type in the field of industrial motor due to its simple structure, high power density, high energy efficiency and excellent dynamic response performance, and is widely used in electric vehicles, wind power generation, industrial automation and other fields. However, with the increasingly fierce market performance ratio competition of motor, the fixing method of permanent magnet in traditional surface-mounted permanent magnet synchronous motor gradually exposes many drawbacks, which restricts its further development and application.

[0003] At present, the common permanent magnet fixing method mainly includes adhesive fixing and mechanical fixing. Adhesive fixing refers to using epoxy resin or other adhesives to paste the permanent magnet on the surface of the rotor. Although the process is simple, the adhesive is prone to aging, which leads to the risk of permanent magnet falling off. Usually, fiber line / belt binding process is used to increase the reliability. The adhesive and curing process is time-consuming and laborious, which greatly increases the production cost. Mechanical fixing is to use screws or sleeves and other mechanical structures to fix the permanent magnet. Although the reliability is high, it will increase the complexity and manufacturing cost of the rotor structure, and also affect the power density and dynamic performance of the motor.

[0004] In summary, developing a new permanent magnet fixing scheme to effectively reduce the cost of motor and improve the performance of motor has become the common goal of the industry.

[0005] The content of the background technology part is only the technology known by the inventor, and does not necessarily represent the prior art in the field. INVENTION CONTENTS

[0006] In view of one or more defects in the prior art, the utility model provides a rotor iron core, which comprises a plurality of punching sheets.

[0007] The punching sheet is in a circular ring structure, and at least one clamping unit is arranged at the outer edge of the punching sheet, and the clamping unit is provided with a clamping groove; for the punching sheet, adjacent clamping units have a preset interval in the circumferential direction of the rotor iron core;

[0008] Among them, the plurality of punching sheets are stacked in a first direction, and a plurality of connection channels are formed based on the clamping units on the plurality of punching sheets, the connection channels are configured to clamp the permanent magnet, adjacent connection channels have a preset interval, and the punching sheets where the clamping units of adjacent two connection channels are not adjacent in the first direction.

[0009] According to one aspect of the present application, the clamping unit comprises two clamping hooks, which are arranged at the outer edge of the punching sheet in a spaced manner and form the clamping groove between them.

[0010] According to one aspect of the present application, the outer edge of the punching sheet is provided with a plurality of clamping units, which are uniformly distributed on the outer edge of the punching sheet and arranged in a circumferential symmetry.

[0011] According to one aspect of the present application, the outer edge of the punching sheet is provided with one, two or three clamping units.

[0012] According to one aspect of the present application, the projection of the clamping unit constituting the adjacent two connecting channels in the first direction is partially overlapped, each clamping unit is only associated with the connecting channel it participates in constituting, and does not overlap with other connecting channels.

[0013] According to one aspect of the present application, the punching sheet is a silicon steel sheet, a soft magnetic composite material sheet or an amorphous alloy sheet.

[0014] The embodiment of the present application further provides a rotor, comprising:

[0015] a plurality of first permanent magnets;

[0016] a plurality of second permanent magnets; and

[0017] a rotor core as described above;

[0018] Wherein, the plurality of first permanent magnets and the plurality of second permanent magnets are arranged in the plurality of connecting channels on the periphery of the rotor core alternately, the N pole of the first permanent magnet faces outward of the rotor core, and the S pole of the second permanent magnet faces outward of the rotor core.

[0019] According to one aspect of the present application, the first permanent magnet and the second permanent magnet are both in the shape of a tile.

[0020] The embodiment of the present application further provides an electric machine, comprising:

[0021] a stator comprising a stator core and a winding; and

[0022] a rotor as described above, which is arranged in the stator.

[0023] Compared with the prior art, the embodiment of the utility model provides a rotor core, a rotor and motor, not only simplify the manufacturing process, reduce the manufacturing cost, realize the high efficiency, firm fixing of permanent magnet, optimize the space utilization of rotor surface, reduce the air gap limit, reduce the magnetic flux leakage phenomenon, be favorable to improve the power density and performance of motor. Among them, through setting up the clamping unit and forming the connecting channel in the outer edge of the punching sheet, only need to clamp the permanent magnet into the connecting channel, can realize the high efficiency, firm fixing of permanent magnet. The structural design of clamping unit ensures the firmness of permanent magnet in high speed operation, avoids the permanent magnet falling risk caused by adhesive aging in traditional adhesive fixing. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings are included to provide a further understanding of the utility model, and constitute a part of the specification, and are used to explain the utility model together with embodiments of the utility model, and do not constitute the limitation to the utility model. In the drawings:

[0025] Figure 1 The schematic diagram of the rotor core according to one embodiment of the utility model is shown;

[0026] Figure 2 The schematic diagram of the punching sheet according to one embodiment of the utility model is shown;

[0027] Figure 3 The schematic diagram of the punching sheet according to another embodiment of the utility model is shown;

[0028] Figure 4 The schematic diagram of a group of punching sheets according to one embodiment of the utility model is shown;

[0029] Figure 5 The schematic diagram of the rotor according to one embodiment of the utility model is shown;

[0030] Figure 6 The schematic diagram of one existing motor is shown;

[0031] Figure 7 The schematic diagram of the rotor of the motor shown is shown; Figure 6 The schematic diagram of the rotor of the motor shown is shown;

[0032] Figure 8 The magnetic force line diagram of the motor shown is shown; Figure 6 The magnetic force line diagram of the motor shown is shown;

[0033] Figure 9 The magnetic force line diagram of the motor according to one embodiment of the utility model is shown. DETAILED DESCRIPTION

[0034] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0035] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0036] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, an electrical connection, or a connection that allows for mutual communication; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0038] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. For the sake of simplicity, the description below of the specific examples will not be exhaustive of the application. Indeed, the application will be described with additional specificity and detail to convey the requisite technical disclosure to one of ordinary skill in the art, such that one of ordinary skill in the art, upon inspecting the following description, application, and figures, could better understand the best ways to make and use the application. It is noted that, as used in the subject specification and the appended claims, the singular forms "a", "an" and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component" or "the component" can include several components unless the context clearly dictates otherwise. It is further noted that the use of "or" in the subject specification and the appended claims is typically used in the sense, and is used per the true meaning, of either / or to mean, for example, at least one of (A) or (B) or (C), or any number of combinations with those items (i.e., A or B or C; A or B or C; A or B or C; A or B or C; 1 or 2 or 3; and so forth). Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The materials, methods, and examples provided herein are illustrative only and are not intended to be limiting. Other suitable materials and / or examples can be utilized without departing from the scope of the application. Nothing herein is to be construed as an admission that the application is not entitled to antedate such disclosure by virtue of prior application.

[0039] The preferred embodiments of the present application will be described below with reference to the drawings. It should be understood that the preferred embodiments described below are merely intended to illustrate and explain the present application, and are not intended to limit the present application.

[0040] Figure 1 A schematic diagram of a rotor core 100 according to an embodiment of the present application is shown, which will be described in detail below. Figure 1

[0041] As shown in Figure 1 , the rotor core 100 mainly comprises a plurality of punched sheets 110, which are substantially identical in structure. Figure 2 A schematic diagram of a punched sheet 110 according to an embodiment of the present application is shown. As shown in Figure 1 and Figure 2 , the punched sheet 110 is in a circular ring structure, and a center hole 120 is provided at the center of the punched sheet 110, which can be matched with a rotating shaft of a motor to realize the connection between the punched sheet 110 (rotor core 100) and the rotating shaft. At least one clamping unit 130 is provided at the outer edge of the punched sheet 110, and each clamping unit 130 is provided with a clamping groove 131 for clamping a permanent magnet. The present application is not limited to the number of clamping units 130 on a single punched sheet 110, and a single punched sheet 110 can be provided with one clamping unit 130 (as shown in Figure 3 ), two clamping units 130 (as shown in Figure 1 and Figure 2 ), three clamping units 130 or more, which are all within the protection scope of the present application. For the punched sheet 110 provided with multiple clamping units 130, the adjacent clamping units 130 have a preset interval in the circumferential direction of the rotor core 100, and preferably, the multiple clamping units 130 are uniformly distributed at the outer edge of the punched sheet 110 and arranged in circumferential symmetry, so as to ensure the dynamic balance in the rotation process, thereby reducing the vibration and deflection and improving the stability and reliability of the overall operation.

[0042] As​Figure 1 and Figure 2 As shown, multiple laminations 110 are stacked along a first direction, and adjacent laminations 110 are staggered at a preset angle. Multiple connecting channels 140 are formed based on the snap-fit ​​units 130 on the laminations 110 (the connecting channels 140 are formed by splicing together the slots 131 in the corresponding snap-fit ​​units 130). Adjacent connecting channels 140 have a preset interval, and the laminations 110 containing the snap-fit ​​units 130 that form two adjacent connecting channels 140 are not adjacent in the first direction. This design, after installing permanent magnets in the connecting channels 140, effectively avoids magnetic circuit connections between adjacent permanent magnets due to the snap-fit ​​units 130, thereby significantly reducing magnetic leakage and improving overall performance (details will be provided later). Specifically, a connection channel 140 is formed by precisely aligning one or more snap-fit ​​units 130 (such as slots 131) on the laminations 110. These connection channels 140 can accommodate permanent magnets, thereby firmly fixing the permanent magnets to the rotor core 100 and ensuring a reliable connection between the permanent magnets and the rotor core 100. For ease of understanding, the following will use... Figure 1 and Figure 2 Let's take an example to illustrate. For example... Figure 1 As shown, the multiple laminations 110 in the rotor core 100 can be divided into several groups, each group containing the same number of laminations 110 (each group contains five laminations 110) and the laminations 110 are arranged in the same way. Figure 4 A set of laminations, referred to sequentially as laminations 110a, 110b, 110c, 110d, and 110e, is shown. They have essentially the same structure, but each lamination is rotated 72° relative to the preceding lamination; that is, the rotation angle between two adjacent laminations is 72° (the rotation angle is related to the number of pole pairs of the rotor 200 and also to the number of snap-fit ​​units 130 on a single lamination). During the fabrication of the rotor core 100, laminations 110a, 110b, 110c, 110d, and 110e are stacked sequentially along a first direction. The snap-fit ​​units 130 on laminations 110 with the same designation are precisely aligned, thereby forming the connection channel 140. Those skilled in the art will readily understand that the rotor core 100 can be composed of one set of laminations 110 or multiple sets of laminations 110. For the scheme using multiple sets of laminations 110, the number of laminations 110 in each set can be the same or different, and the rotation angle between two adjacent laminations 110 can also be adjusted according to the actual situation. The scope of protection of this utility model is not limited to the specific embodiments described above.

[0043] According to one embodiment of the present invention, such as Figure 1 As shown, the lamination 110 can be made of silicon steel sheet, soft magnetic composite material (SMC) sheet or amorphous alloy sheet.

[0044] According to one embodiment of the present application, as shown in Figure 1 and Figure 2 The clamping unit 130 includes two clamping hooks 132, which are arranged at the outer edge of the punching sheet 110. Preferably, the two clamping hooks 132 are symmetrical to each other, and the symmetry line of the two clamping hooks 132 passes through the center of the punching sheet 110 (the center axis of the center hole 120). The clamping groove 131 capable of clamping the permanent magnet is formed between the two clamping hooks 132, specifically, the inner side (i.e. the side facing each other) of the two clamping hooks 132 is respectively provided with a recess 133, so as to form the clamping groove 131 structure capable of clamping the permanent magnet between the two clamping hooks 132.

[0045] According to one embodiment of the present application, as shown in Figure 1 The projection of the clamping unit 130 constituting the adjacent two connecting channels 140 in the first direction is overlapped, each clamping unit 130 is only associated with the connecting channel 140 it participates in constituting, and does not overlap with other connecting channels 140. This design not only optimizes the space layout and improves the space utilization rate on the rotor core 100, but also ensures that the adjacent permanent magnets are not easy to form a magnetic circuit connection due to the clamping unit 130, thereby effectively reducing the magnetic leakage phenomenon. Those skilled in the art can easily understand that in some embodiments, the projections of the clamping units 130 constituting the adjacent two connecting channels 140 in the first direction can also not be overlapped.

[0046] According to one embodiment of the present application, as shown in Figure 1 The punching sheet 110 in the rotor core 100 can be tightly fixed by the lamination process. Preferably, adhesive bonding or welding and the like can be used for auxiliary fixing (adhesive bonding or welding between adjacent punching sheets 110), so as to further enhance the connection strength between the punching sheets 110, so as to ensure the stability and reliability of the rotor core 100.

[0047] Compared with the prior art, the rotor core 100 provided by the embodiment of the present application has significant advantages. Specifically, the punching sheet 110 adopts a simple structure design, which is easy to process and form, and provides convenience for large-scale production. The rotor core 100 is formed by laminating a plurality of punching sheets 110, and the lamination process is simple and efficient, which is beneficial to greatly reducing the production cost. In addition, the rotor core 100 can also efficiently and stably fix the permanent magnet, reduce the magnetic leakage phenomenon, optimize the magnetic circuit distribution, and improve the overall performance of the motor, thereby providing reliable protection for the efficient and stable operation of the motor.

[0048] Figure 5 A schematic view of a rotor 200 according to one embodiment of the present application is shown, which will be described in detail below in conjunction with Figure 5 .

[0049] As shown in Figure 5 The rotor 200 mainly comprises a rotor core 100, a plurality of first permanent magnets 210 and a plurality of second permanent magnets 220, wherein the sum of the number of the first permanent magnets 210 and the second permanent magnets 220 is equal to the number of the connecting channels 140 on the periphery of the rotor core 100. The plurality of first permanent magnets 210 and the plurality of second permanent magnets 220 are alternately arranged in the plurality of connecting channels 140 on the periphery of the rotor core 100, wherein the N-pole of the first permanent magnet 210 faces outward of the rotor core 100, and the S-pole faces inward of the rotor core 100; correspondingly, the S-pole of the second permanent magnet 220 faces outward of the rotor core 100, and the N-pole faces inward of the rotor core 100.

[0050] According to an embodiment of the present application, as shown in Figure 5 The first permanent magnet 210 and the second permanent magnet 220 are both in the shape of a tile, so as to facilitate the installation of the first permanent magnet 210 and the second permanent magnet 220. It is easy for those skilled in the art to understand that the present application is not limited to the specific shape of the first permanent magnet 210 and the second permanent magnet 220, and the first permanent magnet 210 and the second permanent magnet 220 can also be in the shape of a square or the like, which are all within the protection scope of the present application.

[0051] According to an embodiment of the present application, the rotor 200 can further comprise a rotating shaft (not shown in the figure), which is arranged through the rotor core 100. Specifically, the rotor core 100 is formed by laminating a plurality of punching sheets 110, and each punching sheet 110 is provided with a central hole 120, and these central holes 120 jointly form a shaft hole of the rotor core 100 after lamination. The rotating shaft penetrates through the entire rotor core 100 through the shaft hole.

[0052] Compared with the prior art, the rotor 200 provided by the embodiment of the present application has significant advantages. Specifically, the rotor core 100 is formed by laminating a plurality of punching sheets 110, and the lamination process is simple and efficient, which is beneficial to greatly reducing the production cost. In addition, the rotor core 100 can also efficiently and stably fix the permanent magnets (the first permanent magnet 210 and the second permanent magnet 220), and at the same time, the space utilization rate of the surface of the rotor 200 is optimized, the air gap limitation is reduced, the magnetic leakage phenomenon is reduced, and the power density and performance of the motor are improved.

[0053] The embodiment of the present application further provides a motor 300, which comprises a stator and a rotor 200. Wherein the stator comprises a stator core and a winding arranged on the stator core, and the rotor 200 is arranged inside the stator.

[0054] Compared with the prior art, the motor 300 provided by the embodiment of the utility model has obvious advantages. Specifically, the rotor core is formed by laminating a plurality of punched sheets, the lamination process is simple and efficient, and the production cost can be greatly reduced. In addition, the rotor core can efficiently and stably fix the permanent magnet, and the space utilization of the rotor surface is optimized, the air gap is reduced, the magnetic leakage phenomenon is reduced, and the power density and performance of the motor are improved.

[0055] To further illustrate that the motor 300 provided by the embodiment of the utility model can reduce the magnetic leakage phenomenon, the prior art will be described in detail below.

[0056] Figure 6 A schematic diagram of an existing motor 400 is shown, which includes a stator 410 and a rotor 420. The stator 410 can include a stator core and a winding arranged on the stator core, and those skilled in the art can easily understand that the structure and function of the stator 410 can be the same as those of the stator of the motor 300. Figure 7 A schematic diagram of the rotor 420 of the motor 400 is shown, as Figure 6 The rotor 420 of the motor 400 is shown, as Figure 6 And Figure 7 As shown, the rotor 420 includes a rotor core 421 and a plurality of magnetic steels 422, the rotor core 421 is formed by a plurality of silicon steel sheets 423, the silicon steel sheet 423 has a circular structure, a plurality of T-shaped bosses 424 are uniformly distributed on the circumference of the circular structure, and the magnetic steel 422 is clamped between two adjacent T-shaped bosses 424.

[0057] Figure 8 A schematic diagram of the magnetic field of the motor 400 is shown, as Figure 6 As shown, the magnetic field of the motor 400 is shown (the magnetic field is represented by a colored solid line), as Figure 7 And Figure 8 As shown, since the magnetic steel 422 and the T-shaped boss 424 are in contact with each other, and the silicon steel sheet 423 has the characteristic of magnetic conduction (the magnetic resistance of the silicon steel sheet 423 is much smaller than that of air), a part of the magnetic field will be formed between the adjacent magnetic steels 422, and these magnetic fields only form a closed magnetic circuit through the magnetic steel 422 and the rotor core 421, without passing through the stator 410, thereby causing the magnetic leakage phenomenon. Figure 8 The area surrounded by the medium red dashed line intuitively indicates the path and range of the magnetic leakage. This magnetic leakage phenomenon reduces the effective utilization of the magnetic field, and further affects the overall performance and efficiency of the motor 400.

[0058] Correspondingly, Figure 9 A schematic diagram of the magnetic field of the motor 300 according to an embodiment of the utility model is shown, as Figure 5 And Figure 9As shown, the number of hooks 132 between the adjacent first permanent magnet 210 and second permanent magnet 220 is less, and there is also a gap between the hooks 132. And since each clamping unit 130 is only associated with the connection channel 140 it participates in the formation of, and does not overlap with other connection channels 140, the hooks 132 (clamping units 130) that fix the first permanent magnet 210 are only in contact with the first permanent magnet 210, and not in contact with the second permanent magnet 220; the hooks 132 (clamping units 130) that fix the second permanent magnet 220 are only in contact with the second permanent magnet 220, and not in contact with the first permanent magnet 210. This effectively avoids the formation of a low magnetic resistance path between the first permanent magnet 210 and the second permanent magnet 220 through the clamping unit 130, thereby reducing the short circuit phenomenon of the magnetic force lines, significantly reducing the magnetic flux leakage, and improving the utilization rate of the magnetic field.

[0059] Finally, it should be noted that: the above only for the preferred embodiments of the present application, and not for limiting the present application, although the foregoing detailed description of the present application is made with reference to the foregoing embodiments, for those skilled in the art, it can still be modified, or part of the technical features of the equivalent replacement. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A rotor core, characterized in that, Includes multiple stamping plates; The lamination has a circular ring structure, and at least one snap-fit ​​unit is provided on the outer edge of the lamination. The snap-fit ​​unit is provided with a snap-fit ​​groove. For the lamination, adjacent snap-fit ​​units have a preset interval in the circumferential direction of the rotor core. The plurality of laminations are stacked along a first direction, and multiple connection channels are formed based on the snap-fit ​​units on the plurality of laminations. The connection channels are configured to snap-fit ​​permanent magnets. There is a preset interval between adjacent connection channels, and the laminations where the snap-fit ​​units forming two adjacent connection channels are located are not adjacent in the first direction.

2. The rotor core according to claim 1, characterized in that, The snap-fit ​​unit includes two snap hooks, which are spaced apart on the outer edge of the lamination, and form the snap groove between the two snap hooks.

3. The rotor core according to claim 1, characterized in that, The outer edge of the stamping is provided with multiple snap-fit ​​units, which are evenly distributed on the outer edge of the stamping and arranged in a circumferentially symmetrical manner.

4. The rotor core according to claim 1, characterized in that, The outer edge of the lamination is provided with one, two or three snap-fit ​​units.

5. The rotor core according to any one of claims 1-4, characterized in that, The projection portions of the snap-fit ​​units that form two adjacent connection channels overlap in the first direction. Each snap-fit ​​unit is only associated with the connection channel it participates in forming and does not have an overlapping area with other connection channels.

6. The rotor core according to any one of claims 1-4, characterized in that, The laminations are silicon steel sheets, soft magnetic composite material sheets, or amorphous alloy sheets.

7. A rotor, characterized in that, include: Multiple first permanent magnets; Multiple second permanent magnets; and The rotor core according to any one of claims 1-6; The plurality of first permanent magnets and the plurality of second permanent magnets are alternately arranged in the plurality of connecting channels around the rotor core, with the N pole of the first permanent magnet facing outward from the rotor core and the S pole of the second permanent magnet facing outward from the rotor core.

8. The rotor according to claim 7, characterized in that, Both the first permanent magnet and the second permanent magnet are tile-shaped.

9. An electric motor, characterized in that, include: Stator, including stator core and windings; and The rotor of claim 7 or 8, wherein the rotor is disposed within the stator.

Images