Rotor and electric machine

Abstract

The application discloses a rotor and a motor, and belongs to the technical field of mechanical equipment. The rotor comprises a rotor yoke, a rotating shaft, a plurality of rotor cores and a plurality of permanent magnets. The rotor yoke has a disc structure, the middle part of the disc structure is provided with a bearing accommodating groove, and the bearing accommodating groove is provided with a shaft hole. The rotating shaft is located in the shaft hole and connected with the rotor yoke. The plurality of rotor cores are distributed in the circumferential direction on the rotor yoke and connected with the rotor yoke. The permanent magnets are located between the adjacent rotor cores and connected with the rotor cores and the rotor yoke. When the bearing is installed, the bearing can be embedded in the bearing accommodating groove, that is, embedded in the rotor, so that the length of the motor in the axial direction is reduced, and the miniaturization development of the motor is facilitated.

Description

Technical Field

[0001] This application relates to the field of mechanical equipment technology, specifically to a rotor and a motor. Background Technology

[0002] An electric motor consists of a stator, a rotor, and bearings. When the stator is energized, it generates a rotating magnetic field, which allows the rotor to rotate under the influence of the rotating magnetic field, thereby providing torque to other equipment.

[0003] Typically, a rotor consists of a rotor core and a shaft. The shaft is fixedly connected to the rotor core, the inner ring of the bearing is fitted outside the shaft, and the outer ring of the bearing is fixedly connected to the housing or end cover.

[0004] However, in the above rotor structure, in order to reduce the eddy current loss generated by the rotor core, multiple plate-shaped rotor core units are laminated by stamping to obtain a rotor core with an integral structure. However, due to the limitations of the stamping and lamination operation, the rotor core can only form a plate-shaped structure and cannot form a groove for accommodating the bearing. Therefore, the bearing is usually located on the outside of the rotor core. However, this bearing setting will increase the axial length of the motor, which is not conducive to the miniaturization of the motor. Summary of the Invention

[0005] This application provides a rotor and a motor that can solve the technical problems existing in related technologies. The technical solution of the rotor and motor is as follows:

[0006] On one hand, this application provides a rotor, characterized in that the rotor includes a rotor yoke, a shaft, multiple rotor cores, and multiple permanent magnets;

[0007] The rotor yoke has a disk structure, the center of which has a bearing receiving groove, and the bearing receiving groove has a shaft hole;

[0008] The rotating shaft is located in the shaft hole and is connected to the rotor yoke;

[0009] The plurality of rotor cores are distributed circumferentially on the rotor yoke and are connected to the rotor yoke;

[0010] The permanent magnet is located between adjacent rotor cores and is connected to the rotor cores and the rotor yoke.

[0011] In one possible implementation, the rotor yoke has a plurality of core receiving spaces and a plurality of magnet receiving spaces distributed circumferentially, the magnet receiving spaces being located between adjacent core receiving spaces and connected to adjacent core receiving spaces.

[0012] The rotor core is located in the core housing space;

[0013] The permanent magnet is located in the magnet housing space.

[0014] In one possible implementation, the rotor yoke includes a rotor yoke body and a plurality of snap-fit ​​elements. The rotor yoke body has a plurality of iron core receiving spaces and a plurality of magnet receiving spaces. The snap-fit ​​elements are located in the iron core receiving spaces and are connected to the rotor yoke body.

[0015] The rotor core has a snap-fit ​​groove, which is connected to the snap-fit ​​component.

[0016] In one possible implementation, the snap-fit ​​groove has a first groove portion and a second groove portion, the first groove portion being connected to the second groove portion, and the second groove portion being located at the end of the first groove portion away from the axis of the rotor yoke;

[0017] The snap-fit ​​component includes a snap-fit ​​connection portion and a protrusion portion. The two ends of the snap-fit ​​connection portion are respectively connected to the rotor yoke body and the protrusion portion. The protrusion portion is located at the end of the snap-fit ​​connection portion away from the axis of the rotor yoke. In the tangential direction of the rotor yoke, the length of the protrusion portion is greater than the length of the snap-fit ​​connection portion.

[0018] The snap-fit ​​connection portion is located in the first groove, the protrusion is located in the second groove, and the length of the protrusion is greater than the length of the first groove in the tangential direction of the rotor yoke.

[0019] In one possible implementation, the rotor further includes a plurality of core connecting portions 5;

[0020] The core connecting part 5 has a sheet-like structure. The core connecting part is located between two adjacent rotor cores and is connected to the ends of the two rotor cores away from the shaft hole, respectively.

[0021] In one possible implementation, the rotor yoke also has a first protrusion located in the bearing receiving groove.

[0022] In one possible implementation, the outer wall of the shaft has a positioning groove;

[0023] The shaft hole has a second protrusion, which is located in the positioning groove.

[0024] In one possible implementation, the length of the permanent magnet is greater than the length of the rotor core in the axial direction of the rotor yoke.

[0025] In one possible implementation, the rotor yoke is made of a non-magnetic material.

[0026] On the other hand, embodiments of this application provide an electric motor, which includes a rotor as described in any of the preceding claims.

[0027] The technical solutions provided by the embodiments of this application have at least the following beneficial effects:

[0028] This application provides a rotor comprising a rotor yoke, a shaft, multiple rotor cores, and multiple permanent magnets. The rotor yoke has a disc structure with a bearing-receiving groove in the center, and a shaft hole within the bearing-receiving groove. The shaft is located in the shaft hole and connected to the rotor yoke. Multiple rotor cores are circumferentially distributed on the rotor yoke and connected to the rotor yoke. Permanent magnets are located between adjacent rotor cores and connected to both the rotor cores and the rotor yoke. By employing this application, because the bearing-receiving groove is provided in the center of the rotor yoke, the bearing can be embedded in the bearing-receiving groove, i.e., embedded in the rotor, during bearing installation, reducing the axial length of the motor and facilitating the miniaturization of the motor.

[0029] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the structure of a rotor shown in an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of the structure of a rotor shown in an embodiment of this application;

[0033] Figure 3 This is a schematic diagram of a rotor yoke structure shown in an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of the structure of a rotor shown in an embodiment of this application;

[0035] Figure 5 This is a schematic diagram of a rotor yoke structure shown in an embodiment of this application;

[0036] Figure 6 This is a schematic diagram of the structure of a rotor core shown in an embodiment of this application;

[0037] Figure 7 This is a schematic diagram of the structure of a rotor yoke and shaft shown in an embodiment of this application;

[0038] Figure 8 This is a schematic diagram of the structure of an electric motor shown in an embodiment of this application;

[0039] Figure 9 This is a schematic diagram of the structure of an electric motor shown in an embodiment of this application.

[0040] Legend

[0041] 1. Rotor yoke; 2. Shaft; 3. Rotor core; 4. Permanent magnet; 5. Core connection part;

[0042] 11. Rotor yoke body; 12. Snap-fit ​​connector;

[0043] 121. Snap-fit ​​connection part; 122. Protrusion part;

[0044] 1a. Bearing receiving groove; 1b. Shaft hole; 1c. Iron core receiving space; 1d. Magnet receiving space; 1e. First protrusion; 1f. Second protrusion; 2a. Positioning groove; 3a. Snap-fit ​​groove; 3b. First groove; 3c. Second groove;

[0045] 10. Rotor; 20. Stator; 30. End cover; 40. Housing; 50. Bearing. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0047] This application provides a rotor, such as Figure 1 and Figure 2 As shown, the rotor includes a rotor yoke 1, a rotating shaft 2, multiple rotor cores 3, and multiple permanent magnets 4. The rotating shaft 2, multiple rotor cores 3, and multiple permanent magnets 4 are all connected to the rotor yoke 1. The rotor yoke 1 is used to fix the rotating shaft 2, rotor cores 3, and permanent magnets 4 at corresponding positions. The permanent magnets 4 are used to rotate under the action of the rotating magnetic field generated by the stator. The rotor cores 3 are used to enhance the magnetic conductivity of the rotor. The rotating shaft 2 is used to rotate under the drive of the permanent magnets 4, thereby providing torque to other equipment.

[0048] The structure and position of the rotor, including the rotor yoke 1, the rotor shaft 2, the rotor core 3, and the permanent magnet 4, will be described in more detail below:

[0049] Rotor yoke 1

[0050] like Figure 3As shown, the rotor yoke 1 has a disc structure with a bearing receiving groove 1a in the middle of the disc structure. That is, the bearing receiving groove 1a can be set on the end face of the disc structure. When assembling the motor, the bearing receiving groove 1a can accommodate part or all of the volume of the bearing. This setting allows the bearing to be embedded in the rotor, thereby reducing the axial length of the motor.

[0051] The shape of the bearing receiving groove 1a can be any reasonable shape, such as a circular groove or a square groove, etc. The staff can set it according to their own needs. This application embodiment does not limit it in this regard.

[0052] It is understandable that when a bearing needs to be installed on the rotating shaft 2, a bearing receiving groove 1a can be provided on one end face of the rotor yoke 1; when two bearings need to be installed on the rotating shaft 2, a bearing receiving groove 1a can be provided at the corresponding position on the end faces of both sides of the rotor yoke 1.

[0053] In one possible implementation, the size of the bearing receiving groove 1a can be set relatively large to accommodate several types of bearings commonly used in motors in the prior art. In this way, when the bearing is replaced according to different needs, the size of the bearing receiving groove 1a does not need to be adjusted, saving production time and speeding up production efficiency.

[0054] In one possible implementation, such as Figure 3 As shown, the rotor yoke 1 also has a first protrusion 1e, which is located in the bearing receiving groove 1a. The position of the first protrusion 1e can correspond to the position of the inner ring of the bearing. In this way, when the bearing is installed, the end face of the inner ring of the bearing can contact the end face of the first protrusion 1e away from the bottom of the groove 1a, thereby avoiding contact between the outer ring of the bearing and the rotor yoke 1. Thus, when the permanent magnet 4 drives the rotor yoke 1 and the shaft 2 to rotate, the shaft 2 can drive the inner ring of the bearing to rotate, while the outer ring of the bearing (connected to the motor housing or end cover) will not be affected by the rotation of the rotor yoke 1.

[0055] The bearing receiving groove 1a has a shaft hole 1b for mounting the rotating shaft 2. The shape of the shaft hole 1b can be any reasonable shape, such as a circular hole, an elliptical hole, or a square hole, etc. This application embodiment does not limit this, and the operator can set it according to actual needs. Usually, the shaft hole 1b is a circular hole.

[0056] In one possible implementation, the material of the rotor yoke 1 can be any reasonably suitable non-magnetic material, and this application embodiment does not limit this.

[0057] The production method of the rotor yoke 1 can be any reasonable method, such as injection molding or other reasonable methods. This application embodiment does not limit this.

[0058] Shaft 2

[0059] like Figure 1 As shown, the rotating shaft 2 is located in the shaft hole 1b of the rotor yoke 1 described above, and is connected to the rotor yoke 1.

[0060] The length of the rotating shaft 2 can be set according to requirements. This application embodiment does not limit this. Generally, both ends of the rotating shaft 2 need to protrude from the two end faces of the rotor yoke 1.

[0061] The connection between the shaft 2 and the rotor yoke 1 can be any reasonable method, such as adhesive bonding, snap-fit ​​connection, interference fit, etc. This application does not limit this method.

[0062] Rotor core 3

[0063] like Figure 1 As shown, multiple rotor cores 3 are distributed circumferentially on the rotor yoke 1 and connected to the rotor yoke 1. The material of the rotor cores 3 can be any suitable magnetically conductive material, such as silicon steel, silicon steel, etc., and this embodiment does not limit this.

[0064] The connection method between the rotor core 3 and the rotor yoke 1 can be any reasonable connection method, or it can be set according to the specific structure of the rotor yoke 1. For example, when the outer diameter of the rotor yoke 1 is relatively small, one end of the rotor core 3 can be connected to the outer wall of the disc structure of the rotor yoke 1 through any reasonable connection method. Or, when the outer diameter of the rotor yoke 1 is relatively large, the rotor core 3 can be placed inside the rotor yoke 1, etc. The embodiments of this application do not limit this.

[0065] The number of rotor cores 3 can be set according to requirements. For example, the number of rotor cores 3 can be 20 or 18, etc. This application embodiment does not limit this.

[0066] In one possible implementation, two adjacent rotor cores 3 can be connected among the plurality of rotor cores 3, thereby improving the magnetic permeability of the rotor and thus improving the overall performance of the motor.

[0067] The connection method between the rotor cores 3 can be any reasonable method. For example, the connection can be achieved through direct contact or through magnetically conductive materials. This application does not limit this method.

[0068] Permanent magnet 4

[0069] like Figure 1 As shown, the permanent magnet 4 is located between adjacent rotor cores 3 and is connected to the rotor core 3 and rotor yoke 1. Each permanent magnet 4 is connected to its two adjacent rotor cores 3.

[0070] The connection between the permanent magnet 4 and the rotor core 3 can be any reasonable connection method. For example, the permanent magnet 4 and the rotor core 3 can be connected by contact, or they can be connected by other magnetic materials. This application does not limit this.

[0071] The connection method between the permanent magnet 4 and the rotor yoke 1 can be any reasonable connection method, or it can be set according to the specific structure of the rotor yoke 1. For example, when the outer diameter of the rotor yoke 1 is relatively small, one end of the permanent magnet 4 can be connected to the outer wall of the disk structure of the rotor yoke 1 through any reasonable connection method. Or, when the outer diameter of the rotor yoke 1 is relatively large, the permanent magnet 4 can be placed inside the rotor yoke 1, etc. The embodiments of this application do not limit this.

[0072] The number of permanent magnets 4 can be set according to requirements. For example, the number of permanent magnets 4 can be 20 or 16, etc. The number of permanent magnets 4 can be equal to or unequal to the number of rotor cores 3. Operators can set it according to actual needs. This application embodiment does not limit this. When the number of permanent magnets 4 is equal to the number of rotor cores 3, the two can be set alternately.

[0073] The length of the permanent magnet 4 along the axial direction of the rotor yoke 1 can be set according to actual needs, and this embodiment does not limit this. In one possible implementation, the length of the permanent magnet 4 along the axial direction of the rotor yoke 1 is greater than the length of the rotor core 3, which can improve the magnetic focusing effect of the rotor. The ratio of the length of the permanent magnet 4 to the length of the rotor core 3 can be in the range of [1.1, 1.4]. Experiments have shown that permanent magnet 4 and rotor core 3 within this ratio range can result in a better magnetic focusing effect of the rotor.

[0074] The following describes a possible connection method between the rotor core 3, the permanent magnet 4, and the rotor yoke 1:

[0075] like Figure 3 and Figure 4 As shown, the rotor yoke 1 has multiple core accommodating spaces 1c and multiple magnet accommodating spaces 1d distributed along the circumferential direction. That is, the rotor yoke 1 has multiple core accommodating spaces 1c and multiple magnet accommodating spaces 1d distributed along the circumferential direction. Each core accommodating space 1c is used to install a rotor core 3, and each magnet accommodating space 1d is used to install a permanent magnet 4.

[0076] The magnet receiving space 1d is located between and connected to the adjacent iron core receiving spaces 1c. The rotor iron core 3 is located in the iron core receiving space 1c, and the permanent magnet 4 is located in the magnet receiving space 1d. This arrangement allows the permanent magnet 4 installed in the magnet receiving space 1d to be connected to the two rotor iron cores 3 located in the two adjacent iron core receiving spaces 1c on both sides.

[0077] Connection method between rotor yoke 1 and rotor core 3

[0078] like Figure 5 As shown ( Figure 5 It can be Figure 3 (A cross-sectional view of the rotor yoke 1 along a direction perpendicular to its axis) The rotor yoke 1 includes a rotor yoke body 11 and multiple snap-fit ​​components 12.

[0079] The rotor yoke body 11 has a disc structure, a bearing receiving groove 1a in the middle of the rotor yoke body 11, and multiple iron core receiving spaces 1c and multiple magnet receiving spaces 1d.

[0080] The snap-fit ​​component 12 is located in the core receiving space 1c and is connected to the rotor yoke body 11. That is, each snap-fit ​​component 12 is located in a core receiving space 1c and is connected to the inner wall of the core receiving space 1c.

[0081] The rotor yoke body 11 and the multiple snap-fit ​​parts 12 can be integrally formed, or they can be connected by adhesive bonding or other means. This application embodiment does not limit this.

[0082] like Figure 6 As shown, the rotor core 3 has a snap-fit ​​groove 3a, which is connected to the snap-fit ​​member 12. That is, the connection between the rotor core 3 and the rotor yoke 1 is realized through the snap-fit ​​connection between the snap-fit ​​groove 3a and the snap-fit ​​member 12.

[0083] In one possible implementation, the specific structure of the snap-fit ​​slot 3a and the snap-fit ​​member 12 can be as follows:

[0084] like Figure 6 As shown, the snap-fit ​​groove 3a has a first groove 3b and a second groove 3c. The first groove 3b is connected to the second groove 3c, and the second groove 3c is located at one end of the first groove 3b away from the axis (rotor yoke body 11) of the rotor yoke 1.

[0085] Correspondingly, such as Figure 5As shown, the snap-fit ​​member 12 includes a snap-fit ​​connection portion 121 and a protrusion 122. The two ends of the snap-fit ​​connection portion 121 are connected to the rotor yoke body 11 and the protrusion 122, respectively. The protrusion 122 is located at the end of the snap-fit ​​connection portion 121 away from the axis of the rotor yoke 1. In the tangential direction of the rotor yoke 1, the length of the protrusion 122 is greater than the length of the snap-fit ​​connection portion 121.

[0086] Based on the above structure, in the assembled motor, the snap-fit ​​connection part 121 is located in the first slot 3b, the protrusion part 122 is located in the second slot 3c, and in the tangential direction of the rotor yoke 1, the length of the protrusion part 122 is greater than the length of the first slot 3b.

[0087] This configuration allows the second slot 3c to fix the protrusion 122 inside, preventing it from detaching through the first slot 3b, thereby completing the connection between the rotor yoke 1 and the rotor core 3.

[0088] The specific shapes of the first groove 3b, the second groove 3c, the snap-fit ​​connection 121, and the protrusion 122 can be any reasonable shapes. For example, the snap-fit ​​connection 121 can have a plate-like structure, and the protrusion 122 can have a columnar structure, with the outer diameter of the columnar structure being larger than the thickness of the plate-like structure. As for the shapes of the first groove 3b and the second groove 3c, they can be such that the first groove 3b is adapted to the snap-fit ​​connection 121, and the second groove 3c is adapted to the protrusion 122. In this way, when the snap-fit ​​connection 121 is located in the first groove 3b, the snap-fit ​​connection 121 is in contact with the inner sidewall of the first groove 3b. Similarly, when the protrusion 122 is located in the second groove 3c, the protrusion 122 is in contact with the inner sidewall of the second groove 3c. This makes the snap-fit ​​connection between the snap-fit ​​groove 3a and the snap-fit ​​member 12 more secure, avoids the possibility of shaking, and thus improves the overall performance of the motor.

[0089] Based on the above structure, the following settings can also be made: such as Figure 3 As shown, the outer wall of the disc structure of the rotor yoke body 11 has an iron core opening, which allows the rotor iron core 3 to be exposed to the rotor yoke 1 after it is installed. Figure 1 As shown, in this way, in the motor, the end of the rotor core 3 that is away from the axis of the rotor yoke 1 can directly contact the air gap between the rotor and the stator, thereby improving the overall performance of the motor.

[0090] Furthermore, since the protrusion 122 is located at the end of the snap-fit ​​connection 121 away from the axis of the rotor yoke 1, even if there is an opening on the outer side wall of the rotor yoke body 11, the rotor core 3 will not detach from the core receiving space 1c through the opening.

[0091] For the above connection method, the installation method can be as follows: during production, the completed rotor core 3 can be placed in the corresponding position of the core accommodating space 1c in the mold of the rotor yoke 1, and then injection molding is performed into the mold to obtain the rotor yoke 1 connected to the rotor core 3.

[0092] Connection method between rotor yoke 1 and permanent magnet 4

[0093] The rotor yoke 1 and the permanent magnet 4 can be connected by means of injection molding, adhesive bonding, etc., and this application embodiment does not limit this.

[0094] When it is necessary to achieve connection through injection molding, the produced permanent magnet 4 can be placed in the corresponding position of the magnet receiving space 1d in the mold of the rotor yoke 1, and the produced rotor core 3 can be placed in the corresponding position of the core receiving space 1c in the mold of the rotor yoke 1. Then, injection molding is performed into the mold to obtain the rotor yoke 1 connected with the rotor core 3 and the permanent magnet 4.

[0095] When it is necessary to connect them by adhesive bonding, the permanent magnet 4 can be placed in the magnet receiving space 1d during installation, and glue can be injected into the contact position between the two to achieve connection.

[0096] In one possible implementation, the magnet receiving space 1d is open on both end faces of the rotor yoke body 11 along the axial direction, as shown in the figure. Figure 1 As shown, the permanent magnet 4 connected to the rotor yoke 1 can be exposed on the axial end face of the rotor yoke body 11. This can improve the overall performance of the motor and provide an installation entrance for the subsequent installation of the permanent magnet 4.

[0097] The following describes one possible connection method between adjacent rotor cores 3:

[0098] like Figure 6 As shown, the rotor also includes multiple core connecting parts 5. Each core connecting part 5 has a sheet-like structure and is located between two adjacent rotor cores 3. These multiple core connecting parts 5 and the multiple rotor cores 3 can be integrally formed. During production, multiple sheet materials such as silicon steel sheets can be combined together by lamination and stacking to form multiple rotor cores 3 connected by the core connecting parts 5.

[0099] When the core connecting part 5 is connected to two adjacent rotor cores 3, it can be connected to the ends of the two rotor cores 3 that are away from the shaft hole 1b respectively. In this way, after the rotor is installed, the core connecting part 5 can be directly located on the outer side of the outer wall of the rotor yoke 1, and the rotor yoke 1 does not need to provide a corresponding receiving space for the core connecting part 5.

[0100] Furthermore, since the core connecting part 5 has a sheet-like structure, for example, its thickness can be set to 0.3-0.5mm. Compared with the rotor core with a single plate structure in the prior art, the multiple rotor cores 3 in this application are connected by the core connecting part 5 with a sheet structure, which can reduce magnetic leakage and thus improve the overall performance of the motor.

[0101] The following describes one possible connection method between the rotor yoke 1 and the shaft 2:

[0102] The outer wall of the rotating shaft 2 has a positioning groove 2a, and the shaft hole 1b has a second protrusion 1f. The second protrusion 1f can be adapted to the positioning groove 2a. In this way, when the rotating shaft 2 is installed, the second protrusion 1f is located in the positioning groove 2a, thereby realizing the snap-fit ​​connection between the rotating shaft 2 and the rotor yoke 1. When the rotor yoke 1 rotates with the permanent magnet 4, it will also drive the rotating shaft 2 to rotate through the snap-fit ​​connection. The rotation of the rotating shaft 2 realizes the torque output of the motor.

[0103] The specific structure of the positioning groove 2a and the second protrusion 1f can be any reasonable structure, and the embodiments of this application do not limit it.

[0104] This application also provides an electric motor, which may include any of the rotors described above.

[0105] The following explanation uses one possible type of motor as an example:

[0106] like Figure 8 and Figure 9 As shown, the motor may include any of the aforementioned rotor 10, stator 20, end cover 30, housing 40, and two bearings 50. The rotor 10 and stator 20 are located within the accommodating space between the end cover 30 and housing 40. The stator 20 has a ring-shaped structure, fitted over the rotor 10, and the two are coaxially arranged. Both the end cover 30 and housing 40 have through holes for the rotor shaft 2 to pass through. The two bearings are respectively fitted onto the shaft 2 and located on opposite sides of the end cover 30 and housing 40.

[0107] In existing technology, because the rotor core is a single plate structure formed by laminating stamped laminations without grooves, the bearing is usually placed on the outside of the rotor. When the end cover and housing are thin, part of the bearing structure protrudes from the end cover or housing, affecting the motor's aesthetics and increasing its axial length. Typically, for aesthetic purposes, the thickness of the end cover and housing is increased so that the bearing's end face furthest from the rotor is flush with the end face of the end cover or housing. However, this also increases the motor's axial length.

[0108] Depend on Figure 9As can be seen, by adopting this application, a portion of the structure of each of the two bearings 50 is located in the bearing receiving groove 1a of the rotor 10. In this way, the axial length of the motor is reduced, the power density of the motor is increased, and the miniaturization of the motor is facilitated.

[0109] The technical solutions provided by the embodiments of this application have at least the following beneficial effects:

[0110] This application provides a rotor comprising a rotor yoke 1, a shaft 2, multiple rotor cores 3, and multiple permanent magnets 4. The rotor yoke 1 has a disc structure with a bearing receiving groove 1a in the center, and a shaft hole 1b within the bearing receiving groove 1a. The shaft 2 is located in the shaft hole 1b and connected to the rotor yoke 1. Multiple rotor cores 3 are circumferentially distributed on the rotor yoke 1 and connected to it. The permanent magnets 4 are located between adjacent rotor cores 3 and connected to both the rotor cores 3 and the rotor yoke 1. By employing this application, since the bearing receiving groove 1a is provided in the center of the rotor yoke 1, the bearing can be embedded in the bearing receiving groove 1a, i.e., embedded in the rotor, during bearing installation, reducing the axial length of the motor and facilitating the miniaturization of the motor.

[0111] In this application, the term "at least one" means one or more, and the term "multiple" means two or more.

[0112] In this application, the terms "first" and "second," etc., are used to distinguish identical or similar items that have substantially the same function and purpose. It should be understood that there is no logical or temporal dependency between "first" and "second," nor does it limit the quantity or order of execution. It should also be understood that although the following description uses the terms "first" and "second," etc., to describe various structures, these structures should not be limited by the terms. These terms are merely used to distinguish one structure from another. For example, without departing from the scope of the various examples, a first part can be referred to as a second part, and similarly, a second part can be referred to as a first part.

[0113] The above description is merely an optional embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and such modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A rotor, characterized in that, The rotor includes a rotor yoke (1), a shaft (2), multiple rotor cores (3) and multiple permanent magnets (4). The rotor yoke (1) has a disc structure, and the middle part of the disc structure has a bearing receiving groove (1a). The bearing receiving groove (1a) has a shaft hole (1b). The rotor yoke (1) includes a rotor yoke body (11) and a plurality of snap-fit ​​pieces (12). The rotor yoke body (11) has a plurality of iron core receiving spaces (1c) and a plurality of magnet receiving spaces (1d) distributed circumferentially. The magnet receiving spaces (1d) are located between adjacent iron core receiving spaces (1c) and are connected to the adjacent iron core receiving spaces (1c). The snap-fit ​​pieces (12) are located in the iron core receiving spaces (1c) and are connected to the rotor yoke body (11). The rotating shaft (2) is located in the shaft hole (1b) and is connected to the rotor yoke (1); The plurality of rotor cores (3) are distributed circumferentially on the rotor yoke (1). The rotor cores (3) are located in the core receiving space (1c) and connected to the rotor yoke (1). The rotor cores (3) have snap-fit ​​grooves (3a). The snap-fit ​​grooves (3a) have a first groove (3b) and a second groove (3c). The first groove (3b) is connected to the second groove (3c), and the second groove (3c) is located at one end of the first groove (3b) away from the axis of the rotor yoke (1). The snap-fit ​​component (12) includes a snap-fit ​​connection part (121) and a protrusion (122). The two ends of the snap-fit ​​connection part (121) are connected to the rotor yoke body (11) and the protrusion (122) respectively. The protrusion (122) is located at one end of the snap-fit ​​connection part (121) away from the axis of the rotor yoke (1). In the tangential direction of the rotor yoke (1), the length of the protrusion (122) is greater than the length of the snap-fit ​​connection part (121). The snap-fit ​​connection (121) is located in the first groove (3b), the protrusion (122) is located in the second groove (3c), and in the tangential direction of the rotor yoke (1), the length of the protrusion (122) is greater than the length of the first groove (3b); The permanent magnet (4) is located between adjacent rotor cores (3) in the magnet accommodating space (1d) and is connected to the rotor core (3) and the rotor yoke (1).

2. The rotor according to claim 1, characterized in that, The rotor also includes multiple iron core connecting parts (5). The core connecting part (5) has a sheet-like structure. The core connecting part (5) is located between two adjacent rotor cores (3) and is connected to the ends of the two rotor cores (3) away from the shaft hole (1b).

3. The rotor according to claim 1, characterized in that, The rotor yoke (1) also has a first protrusion (1e) located in the bearing receiving groove (1a).

4. The rotor according to claim 1, characterized in that, The outer wall of the rotating shaft (2) has a positioning groove (2a). The shaft hole (1b) has a second protrusion (1f) located in the positioning groove (2a).

5. The rotor according to claim 1, characterized in that, In the axial direction of the rotor yoke (1), the length of the permanent magnet (4) is greater than the length of the rotor core (3).

6. The rotor according to claim 1, characterized in that, The rotor yoke (1) is made of a non-magnetic material.

7. An electric motor, characterized in that, The motor includes a rotor as described in any one of claims 1-6.

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