Motor rotor and motor

Abstract

The invention provides a motor rotor and a motor. In the motor rotor, the carbon fiber sleeve sleeved on the peripheral surface of the rotor main body provides effective protection for the rotor main body, and particularly provides good protection for each rotor unit forming the rotor main body under the condition of high rotating speed. Moreover, the split parts of the rotor main body and the magnets are formed into a whole, so that the component of centrifugal force applied to the carbon fiber sleeve, which is generated by each part of the rotor main body in the working process of the motor rotor, can be reduced, the acting force applied to the carbon fiber sleeve is reduced, and the deformation risk of the rotor main body is also reduced. Furthermore, the connecting part formed after the injection-molded high polymer material is cured can play a role in isolating magnetism, so that the magnetic leakage is very small.

Description

Technical Field

[0001] The present application relates to the field of motors, and in particular to a motor rotor and a motor comprising the motor rotor. Background Art

[0002] In the existing electric drive system of vehicles, motors (such as permanent magnet synchronous motors) are usually used to drive the vehicle, which requires the motor to have a high speed so that the vehicle has better performance. However, as the speed of the motor increases, the rotor stack will be subjected to very large centrifugal force, which may cause deformation and damage to the rotor structure.

[0003] In existing motors, the rotor speed may reach 20,000 revolutions per minute, so some structures of the rotor need to be designed to be thick enough to resist the centrifugal force generated under high speed conditions. However, this may lead to more magnetic flux leakage, which will lead to a decrease in magnetic flux utilization and the efficiency of the entire motor. Therefore, there is an urgent need for a motor rotor that can balance structural robustness and magnetic flux performance under high speed conditions. Summary of the invention

[0004] This application is made in view of the above-mentioned state of the prior art. One object of this application is to provide a motor rotor that can balance structural robustness and magnetic flux performance under high speed conditions. Another object of this application is to provide a motor including the above-mentioned motor rotor.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions.

[0006] The present application provides a motor rotor, comprising:

[0007] A rotor body, which is formed in a cylindrical shape as a whole, includes a plurality of rotor units stacked in an axial direction, each of the rotor units includes a plurality of split parts, and each of the rotor units defines a plurality of slots through the plurality of split parts;

[0008] a plurality of magnets installed in the plurality of grooves, wherein an injection molding material is injected into the plurality of grooves, and after the injection molding material is cured, the plurality of magnets and the plurality of split parts are integrated; and

[0009] The carbon fiber sleeve is formed into a cylindrical shape and covers the entire outer peripheral surface of the rotor body.

[0010] In an optional solution, the carbon fiber sleeve is a cylindrical body formed by winding a carbon fiber strip on the outer circumferential surface of the rotor body.

[0011] In another optional solution, the injecting is completed by filling the plurality of grooves with the injection molding material while the plurality of magnets are located in the plurality of grooves.

[0012] In another optional solution, each of the rotor units includes a first split part, a second split part and a third split part.

[0013] The first split part is an annular body, and the first split part is formed with a plurality of first recesses, and the plurality of first recesses are spaced apart in the circumferential direction of the rotor body. The second split part is located in the corresponding first recesses, so that a first groove for accommodating and installing a first magnet is defined between the second split part and the first split part, and each second split part is formed with a second recess, and the third split part is located in the corresponding second recess, so that a second groove for accommodating and installing a second magnet is defined between the third split part and the second split part.

[0014] In another optional scheme, a pair of the first grooves in a V-shape are defined between a second split portion and the first split portion, and a pair of the second grooves in a V-shape are defined between a third split portion and a second split portion, and each pair of the second grooves is located radially outward of the corresponding pair of the first grooves.

[0015] In another optional solution, for a pair of the first grooves, radially outer ends of the two first grooves are formed with openings on the outer peripheral surface of the rotor body, and radially inner ends of the two first grooves are connected to each other; and

[0016] Regarding the pair of the second grooves, radially outer end portions of the two second grooves are formed with openings on the outer peripheral surface of the rotor body, and radially inner end portions of the two second grooves are communicated with each other.

[0017] In another optional solution, the motor rotor includes a plurality of connection parts formed after the injection molding material is solidified, the plurality of split parts and the plurality of magnets are fixed to each other via the plurality of connection parts, and the connection parts cover the corresponding magnets.

[0018] In another optional solution, a first magnet is accommodated and installed in each of the first slots, the radially outer end of the first magnet is completely covered by the connecting portion, so that the radially outer end of the first magnet is not exposed, and the radially inner end of the first magnet is completely covered by the connecting portion, so that the radially inner ends of the first magnets accommodated and installed in the pair of first slots are separated from each other, and

[0019] A second magnet is accommodated and installed in each of the second slots, and the radially outer end of the second magnet is completely covered by the connecting portion so that the radially outer end of the second magnet is not exposed, and the radially inner end of the second magnet is completely covered by the connecting portion so that the radially inner ends of the second magnets accommodated and installed in the paired second slots are separated from each other.

[0020] In another optional solution, the connecting portion has an end stop portion located at the axial end surface of the rotor body, and the end stop portion covers and exceeds the axial end surfaces of the first magnet and the second magnet.

[0021] The present application also provides a motor, comprising the motor rotor described in any one of the above technical solutions.

[0022] By adopting the above technical solution, the present application provides a new type of motor rotor and a motor including the motor rotor. In the motor rotor of the present application, it includes a rotor body, a plurality of magnets and a carbon fiber sleeve assembled together. The rotor body is formed into a cylindrical shape as a whole, and the rotor body includes a plurality of rotor units stacked in the axial direction, and each rotor unit includes a plurality of split parts. A plurality of slots are defined by the plurality of split parts, and a plurality of magnets are inserted and installed in these slots. Injection molding material is injected into the plurality of slots. After the injection molding material is solidified, the plurality of magnets and the plurality of split parts are formed into one body and fixed to each other. In addition, the carbon fiber sleeve is formed into a cylindrical shape and is coated on the outer peripheral surface of the rotor body.

[0023] In this way, on the one hand, the carbon fiber sleeve mounted on the outer peripheral surface of the rotor body provides effective protection for the rotor body, especially provides good protection for each rotor unit constituting the rotor body under high speed conditions. Therefore, it is possible to ensure that the motor rotor of the present application achieves structural firmness under high speed conditions, so that the rotor body can stably work under a relatively high speed (for example, greater than 23,000 rpm). Moreover, by forming the various parts of the rotor body and the magnet into one, the centrifugal force generated by the various parts of the rotor body during the operation of the motor rotor and applied to the carbon fiber sleeve can be reduced, thereby reducing the size of the force acting on the carbon fiber sleeve and reducing the risk of deformation of the rotor body. On the other hand, the connection part formed after the injection-molded polymer material is solidified can play a role in magnetic isolation, so that the magnetic leakage is very small. In fact, since the polymer material forming the connection part cannot conduct magnetic flux, it can be considered that there is no magnetic leakage in the motor rotor of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1A is a three-dimensional schematic diagram showing a motor rotor according to an embodiment of the present application.

[0025] Figure 1B It shows Figure 1A Schematic diagram of the main view of the motor rotor in .

[0026] Figure 2A It shows Figure 1A A three-dimensional schematic diagram of the assembly of the rotor body, magnet and connecting part of the motor rotor.

[0027] Figure 2B It shows Figure 2A A schematic diagram of a partial structure of an assembly in which the end stop of the connecting portion is omitted.

[0028] Figure 3A It shows Figure 1A Schematic diagram of the front view of the rotor body of the motor rotor.

[0029] Figure 3B It shows Figure 3A A partial enlarged schematic diagram of the rotor body in FIG.

[0030] Figure 4 It shows Figure 1A Schematic diagram of a motor rotor with multiple magnets installed in one slot unit.

[0031] Figure 5 It shows Figure 1A A three-dimensional schematic diagram of the carbon fiber sleeve of the motor rotor.

[0032] Description of Reference Numerals

[0033] 1 rotor body; 1u rotor unit; 1h1 first slot; 1h11 first mounting slot portion; 1h12 first magnetic isolation slot portion; 1h2 second slot; 1h21 second mounting slot portion; 1h22 second magnetic isolation slot portion; 11 first split portion; 12 second split portion; 13 third split portion;

[0034] 2 a first magnet;

[0035] 3 second magnet;

[0036] 4 Carbon fiber sleeves;

[0037] 5 rotor shaft;

[0038] 6 connecting portion; 61 end stop portion; 62 injection portion;

[0039] A is the axial direction; C is the circumferential direction; L is the line of symmetry. DETAILED DESCRIPTION

[0040] The exemplary embodiments of the present application are described below with reference to the accompanying drawings. It should be understood that these specific descriptions are only used to teach those skilled in the art how to implement the present application, and are not intended to exhaust all feasible methods of the present application, nor to limit the scope of the present application.

[0041] It should be noted that, in this application, unless otherwise specified, "axial", "radial" and "circumferential" refer to the axial, radial and circumferential directions of the motor rotor (rotor body), respectively. "Radially outer" refers to the side radially away from the central axis of the motor rotor, and "radially inner" refers to the side radially close to the central axis of the motor rotor.

[0042] The structure of a motor rotor according to an embodiment of the present application is described below in conjunction with the accompanying drawings.

[0043] like Figure 1A , Figure 1B , Figure 2A , Figure 2B As shown, the motor rotor according to an embodiment of the present application includes a rotor body 1, a first magnet 2, a second magnet 3, a carbon fiber sleeve 4, a rotor shaft 5 and a connecting portion 6 assembled together. The first magnet 2 and the second magnet 3 are respectively received and installed in different grooves 1h1 and 1h2 of the rotor unit 1u of the rotor body 1, the carbon fiber sleeve 4 is coated on the outer circumferential surface of the rotor body 1, and the rotor shaft 5 is inserted and fixed in the rotor body 1.

[0044] In this embodiment, if Figure 2A and Figure 3A As shown, the rotor body 1 is formed as a whole in a cylindrical shape. The rotor body 1 includes a plurality of (three in this embodiment) rotor units 1u stacked in the axial direction A. The plurality of rotor units 1u may have the same structure and be arranged in a coaxial manner, and the slot units of adjacent rotor units 1u may not be completely aligned in the circumferential direction C of the motor rotor, and the positions of the magnets 2 and 3 installed in adjacent rotor units 1u are staggered. The motor rotor formed by this structure is a so-called skewed slot motor rotor. Further, as Figure 3A As shown, the rotor unit 1u includes a first sub-body 11, a second sub-body 12 and a third sub-body 13, and each sub-body 11, 12, 13 of each rotor unit 1u can be formed by stacking a plurality of sheet-like laminated bodies having the same structure in the axial direction A. For each sub-body 11, 12, 13, the structure of all sheet-like laminated bodies is the same, so that the sheet-like layers constituting each of the three sub-body parts can be sheets formed by the same stamping process, wherein a typical example of the sheet is a silicon steel sheet, or it can be a sheet made of other conductive materials.

[0045] In order to accommodate and install the first magnet 2 and the second magnet 3, as FIG. 2A to FIG. 3BAs shown, the rotor unit 1u is formed with a plurality of first grooves 1h1 and a plurality of second grooves 1h2 extending along the axial direction A. Specifically, the first split portion 11 is an annular body. The first split portion 11 is formed with a plurality of first recesses, and the plurality of first recesses are spaced apart in the circumferential direction of the rotor body. Each second split portion 12 is located in the corresponding first recess, so that a first groove 1h1 for accommodating and installing the first magnet 2 is defined between the second split portion 12 and the first split portion 11. Each second split portion 12 is formed with a second recess, and a third split portion 13 is located in the corresponding second recess, so that a second groove 1h2 for accommodating and installing the second magnet 3 is defined between the third split portion 13 and the second split portion 12.

[0046] like Figure 3A and Figure 3B As shown, a plurality of first slots 1h1 are arranged at intervals in the circumferential direction C, and two adjacent first slots 1h1 in the circumferential direction C are arranged in pairs and form a group. In each pair of first slots 1h1, the two first slots 1h1 are arranged in a V-shaped layout and the angle formed by their extension directions can be an obtuse angle, where the opening of the V-shaped opening can be oriented toward the radial outer side of the rotor body 1, and the sharp corner or bottom of the V-shaped opening can be oriented toward the radial inner side or center of the rotor body 1. For each pair of first slots 1h1, the radial inner ends of the two first slots 1h1 are connected to each other, and no magnetic isolation bridge is formed between the two first slots 1h1; moreover, each first slot 1h1 extends to the outer peripheral surface of the rotor body 1 and has an opening on the outer peripheral surface, so that the radial outer end of each first slot 1h1 is open toward the radial outer side of the rotor body 1. In addition, each first slot 1h1 includes a first mounting slot portion 1h11 that is connected to each other and a first magnetic isolation slot portion 1h12 located on both sides of the first mounting slot portion 1h11. The first mounting slot portion 1h11 is used to accommodate and install the first magnet 2. The two first magnetic isolation grooves 1h12 are respectively located radially inside and radially outside the first mounting groove 1h11, which can effectively reduce magnetic leakage.

[0047] like Figure 3A and Figure 3BAs shown, a plurality of second slots 1h2 are arranged at intervals in the circumferential direction C, and two second slots 1h2 adjacent to each other in the circumferential direction C are arranged in pairs and form a group. In each pair of second slots 1h2, the two second slots 1h2 are arranged in a V-shaped layout and the angle formed by their extension directions can be an obtuse angle, where the opening of the V-shaped opening can be directed toward the radial outer side of the rotor body 1, and the sharp corner or bottom of the V-shaped opening can be directed toward the radial inner side or center of the rotor body 1. For each pair of second slots 1h2, the radial inner ends of the two second slots 1h2 are connected to each other, and no magnetic isolation bridge is formed between the two second slots 1h2; moreover, each second slot 1h2 extends to the outer peripheral surface of the rotor body 1 and has an opening on the outer peripheral surface, so that the radial outer end of each second slot 1h2 is open toward the radial outer side of the rotor body 1. In addition, each second slot 1h2 includes a second mounting slot portion 1h21 that is connected to each other and a second magnetic isolation slot portion 1h22 located on both sides of the second mounting slot portion 1h21. The second mounting slot portion 1h21 is used to accommodate and install the second magnet 3. The two second magnetic isolation grooves 1h22 are respectively located radially inside and outside the second mounting groove 1h21, which can effectively reduce magnetic leakage.

[0048] In addition, if Figure 3B As shown, two second slots 1h2 arranged in pairs correspond to two first slots 1h1 arranged in pairs, and each pair of second slots 1h2 is located at a radially outer position of a corresponding pair of first slots 1h1, so that each pair of second slots 1h2 arranged in this way and a corresponding pair of first slots 1h1 constitute a slot unit. For each slot unit, the first slot 1h1 and the second slot 1h2 form a so-called double V-shaped layout, and there is a symmetry line L extending along a radial direction, so that the slot unit as a whole has a line symmetric structure relative to the symmetry line L. In each slot unit, the volume of the first slot 1h1 is greater than the volume of the second slot 1h2, so that the first slot 1h1 is used to install a larger magnet, and the second slot 1h2 is used to install a smaller magnet. In this embodiment, eight slot units are evenly distributed in the circumferential direction C of the motor rotor.

[0049] In this embodiment, if Figure 2B and Figure 4 As shown, a first magnet 2 is housed and installed in each first slot 1h1. The first magnets 2 housed and installed in these first slots 1h1 have the same rectangular shape. In addition, a second magnet 3 is housed and installed in each second slot 1h2, and the plurality of second magnets 3 also have the same rectangular shape. In addition, in order to avoid interference and the like, the axial end faces of the first magnet 2 housed and installed in the first slot 1h1 and the second magnet 3 housed and installed in the second slot 1h2 can be flush with the axial end faces of the rotor unit 1u in which they are installed. By forming the slot units arranged as above and installing the corresponding first magnets 2 and second magnets 3, not only the NVH performance of the motor rotor can be improved, but also the magnetic flux from the motor rotor to the motor stator can be increased.

[0050] In this embodiment, if Figure 1A , Figure 1B and Figure 5 As shown, the carbon fiber sleeve 4 is a cylindrical body formed by winding a carbon fiber strip on the outer circumference of the rotor body 1. The carbon fiber sleeve 4 covers the entire outer circumference of the rotor body 1 to limit the deformation of the rotor unit 1u of the rotor body 1 that may occur in a high speed state. Based on the evaluation of the centrifugal force of the electronic rotor, the thickness of the carbon fiber sleeve 4 can be set to be greater than or equal to 0.5 mm and less than or equal to 3 mm. In addition, in the process of winding the carbon fiber sleeve 4, a pre-tightening force can be applied and / or it can be carried out in a low temperature environment (for example, minus 20 degrees), which is conducive to reducing the thickness of the carbon fiber sleeve 4.

[0051] In this embodiment, if Figure 2A and Figure 2B As shown, in order to integrate the three parts 11, 12, 13 of the rotor unit and the multiple magnets 2, 3, the injection molding material is injected when the magnets 2, 3 are already accommodated in the first slot 1h1 and the second slot 1h2, so that the injection molding material fills the first slot and the second slot. The "filling" here includes roughly filling, that is, the injection molding material injected into each slot occupies more than 95% of the volume of the slot, so that there is no void or hole inside the injection molding material filled in the slot. In this way, by injecting the injection molding material into the multiple slots 1h1, 1h2, a plurality of connecting parts 6 are formed after the injection molding material is solidified, and the multiple parts 11, 12, 13 and the multiple magnets 2, 3 are fixed to each other through the multiple connecting parts 6, and the connecting parts 6 cover the corresponding magnets 2, 3.

[0052] Specifically, Figure 2A and Figure 2BAs shown, after the injection molding material is solidified, the connection portion 6 includes an end stop portion 61 and an insertion portion 62 formed as one piece. The end stop portion 61 is located at both axial end faces of the rotor body 1, and the area of ​​the end stop portion 61 is designed to not only cover the axial end faces of the first magnet 2 and the second magnet 3, but also extend to the corresponding axial end faces of the rotor body 1, that is, the end stop portion 61 extends beyond the axial end faces of the first magnet 2 and the second magnet 3. As a result, the end stop portion 61 not only plays a role in isolating and protecting the magnets 2 and 3, but also plays a role in protection and positioning. Further, the insertion portion 62 is located in the first slot 1h1 and the second slot 1h2, mainly in the magnetic isolation slot portions 1h12 and 1h22 of the two slots 1h1 and 1h2. In this way, the radially outer end of the first magnet 2 is completely covered by the insertion portion 62 of the connection portion 6, so that the radially outer end of the first magnet 2 is not exposed through the opening of the first slot 1h1 on the outer peripheral surface of the rotor body 1; the radially inner end of the first magnet 2 is completely covered by the insertion portion 62 of the connection portion 6, so that the radially inner ends of the first magnet 2 accommodated and installed in the pair of first slots 1h1 are separated from each other. The radially outer end of the second magnet 3 is completely covered by the insertion portion 62 of the connection portion 6, so that the radially outer end of the second magnet 3 is not exposed through the opening of the second slot 1h2 on the outer peripheral surface of the rotor body 1; the radially inner end of the second magnet 3 is completely covered by the insertion portion 62 of the connection portion 6, so that the radially inner ends of the second magnet 3 accommodated and installed in the pair of second slots 1h2 are separated from each other. In this way, the connection portion 6 can play a magnetic isolation role, so that magnetic leakage is very small. In fact, since the polymer material forming the connection portion 6 cannot conduct magnetic flux, it can be considered that there is no magnetic flux leakage when the magnets 2 and 3 are completely covered by the polymer material.

[0053] In this embodiment, if Figure 1A and Figure 1B As shown, the rotor body 1 is sleeved on the rotor shaft 5 and fixed together with the rotor shaft 5. The rotor shaft 5 can be connected to a transmission of a vehicle to transmit torque in both directions.

[0054] By adopting the above scheme, on the one hand, the carbon fiber sleeve 4 mounted on the rotor body 1 provides effective protection for the rotor body 1, especially provides good protection for the rotor units 1u constituting the rotor body 1 under high speed conditions; on the other hand, by integrating the various parts 11, 12, 13 of the rotor body 1 and the magnets 2, 3, the centrifugal force generated by the various parts of the rotor body 1 during the operation of the motor rotor can be reduced. The magnitude of the force acting on the carbon fiber sleeve 4 is reduced, and the risk of deformation of the rotor body is also reduced.

[0055] The carbon fiber sleeve 4 is wound around the rotor body 1. When the motor is in operation, the split parts 11, 12, and 13 of the rotor body 1 will exert a relatively large pressure on the magnets 2 and 3. In the embodiment of the present application, due to the use of injection molding materials, the injection molding materials can withstand or alleviate the pressure or pressure concentration acting on the magnets 2 and 3, and the damage to the brittle magnets 2 and 3 can be avoided. In this way, the performance of the rotor body 1 and the motor can be ensured and their lifespan can be improved. Optionally, the carbon fiber sleeve 4 can be wound around the outer peripheral surface of the rotor body 1 after injection molding. In this way, it is convenient to hold the rotor body 1 when winding the carbon fiber sleeve 4, and the damage to the magnets 2 and 3 caused by the pressure when winding the carbon fiber sleeve 4 can also be reduced.

[0056] It should be understood that the above embodiments are merely exemplary and are not intended to limit the present application. Those skilled in the art may make various modifications and changes to the above embodiments under the guidance of the present application without departing from the scope of the present application. Further, the following supplementary explanations are provided.

[0057] i. The present application also provides a motor, which includes a motor rotor and a motor stator according to the present application. The motor stator can be located radially outside the motor rotor and separated from the motor rotor by a predetermined gap. In an optional solution, the motor can also include a rotor bracket, the motor rotor can be fixed to the rotor bracket from the radial outside, and the rotor bracket is mounted on the rotor shaft 5 from the radial outside.

[0058] ii. It can be understood that the motor rotor of the present application is not limited to the skew slot motor rotor. For example, the slot units of adjacent rotor units 1u can be completely aligned in the circumferential direction C of the motor rotor, so that the magnets 2 and 3 of adjacent rotor units 1u are completely aligned. The motor rotor formed by this structure is a so-called straight slot motor rotor.

[0059] iii. It can be understood that in each slot unit, the angle formed by the extension directions of the two first slots 1h1 does not necessarily form an obtuse angle, but can also form a larger acute angle (for example, close to 90 degrees); the angle formed by the extension directions of the two second slots 1h2 does not necessarily form an obtuse angle, but can also form a larger acute angle (for example, close to 90 degrees). In the motor rotor of the present application, the number of slot units is not limited to eight as described in the above embodiment, but the number of slot units can be adjusted as needed.

[0060] iv. It is understood that the injection molding material can be used as an adhesive, and examples thereof can be polyphenylene sulfide, polyamide or other materials, which have the same function. Moreover, the insertion portion 62 of the connecting portion 6 formed after the injection molding material is solidified includes not only the portion located in the magnetic isolation groove portion 1h12, 1h22 of each groove 1h1, 1h2, but also the portion located in the mounting groove portion 1h11, 1h21.

Claims

1. A motor rotor, characterized in that: include: A rotor body (1) formed in a cylindrical shape as a whole, the rotor body (1) comprising a plurality of rotor units (1u) stacked in an axial direction (A), each of the rotor units (1u) comprising a plurality of split parts (11, 12, 13), and each of the rotor units (1u) defining a plurality of slots (1h1, 1h2) through the plurality of split parts (11, 12, 13); A plurality of magnets (2, 3) are installed in the plurality of grooves (1h1, 1h2), injection molding material is injected into the plurality of grooves (1h1, 1h2), and after the injection molding material is solidified, the plurality of magnets (2, 3) and the plurality of split parts (11, 12, 13) are integrated; and A carbon fiber sleeve (4) is formed into a cylindrical shape and covers the entire outer peripheral surface of the rotor body (1).

2. The motor rotor according to claim 1, characterized in that: The carbon fiber sleeve (4) is a cylindrical body formed by winding a carbon fiber strip on the outer peripheral surface of the rotor body (1).

3. The motor rotor according to claim 1, characterized in that: The injection is completed in a manner that the plurality of grooves (1h1, 1h2) are filled with the injection molding material while the plurality of magnets (2, 3) are located in the plurality of grooves (1h1, 1h2).

4. The motor rotor according to any one of claims 1 to 3, characterized in that: Each of the rotor units (1u) comprises a first split part (11), a second split part (12) and a third split part (13), The first split part (11) is an annular body, and the first split part (11) is formed with a plurality of first recesses, and the plurality of first recesses are spaced apart in the circumferential direction (C) of the rotor body (1); the second split part (12) is located in the corresponding first recess, so that a first groove (1h1) for receiving and installing the first magnet (2) is defined between the second split part (12) and the first split part (11); each second split part (12) is formed with a second recess, and the third split part (13) is located in the corresponding second recess, so that a second groove (1h2) for receiving and installing the second magnet (3) is defined between the third split part (13) and the second split part (12).

5. The motor rotor according to claim 4, characterized in that: A pair of the first grooves (1h1) arranged in a V-shape is defined between one of the second split parts (12) and the first split part (11), and a pair of the second grooves (1h2) arranged in a V-shape is defined between one of the third split parts (13) and one of the second split parts (12), and each pair of the second grooves (1h2) is located radially outward of the corresponding pair of the first grooves (1h1).

6. The motor rotor according to claim 5, characterized in that: For a pair of the first grooves (1h1), radially outer ends of the two first grooves (1h1) are formed with openings on the outer peripheral surface of the rotor body (1), and radially inner ends of the two first grooves (1h1) are connected to each other; and For a pair of the second grooves (1h2), radially outer ends of the two second grooves (1h2) are formed with openings on the outer peripheral surface of the rotor body (1), and radially inner ends of the two second grooves (1h2) are connected to each other.

7. The motor rotor according to claim 6, characterized in that: The motor rotor comprises a plurality of connection parts (6) formed after the injection molding material is solidified, the plurality of split parts (11, 12, 13) and the plurality of magnets (2, 3) are fixed to each other via the plurality of connection parts (6), and the connection parts (6) cover the corresponding magnets (2, 3).

8. The motor rotor according to claim 7, characterized in that: A first magnet (2) is accommodated and installed in each of the first slots (1h1), the radial outer end of the first magnet (2) is completely covered by the connecting portion (6), so that the radial outer end of the first magnet (2) is not exposed, the radial inner end of the first magnet (2) is completely covered by the connecting portion (6), so that the radial inner ends of the first magnets (2) accommodated and installed in the paired first slots (1h1) are separated from each other, and A second magnet (3) is accommodated and installed in each of the second slots (1h2), and the radial outer end of the second magnet (3) is completely covered by the connecting portion (6), so that the radial outer end of the second magnet (3) is not exposed, and the radial inner end of the second magnet (3) is completely covered by the connecting portion (6), so that the radial inner ends of the second magnets (3) accommodated and installed in the paired second slots (1h2) are separated from each other.

9. The motor rotor according to claim 8, characterized in that: The connecting portion (6) has an end stop portion (61) located at the axial end surface of the rotor body (1), and the end stop portion (61) covers and exceeds the axial end surfaces of the first magnet (2) and the second magnet (3).

10. A motor, characterized in that: The invention comprises the motor rotor according to any one of claims 1 to 9.

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