Permanent magnet rotor and motor

Abstract

The utility model discloses a permanent magnet rotor and a motor. The permanent magnet rotor comprises a rotor core and permanent magnets. The rotor core is provided with a shaft hole and a plurality of magnetic steel grooves, and the plurality of magnetic steel grooves are arranged at intervals along the periphery of the shaft hole; a plurality of permanent magnets are arranged, the plurality of permanent magnets and the plurality of magnetic steel grooves are arranged in a one-to-one correspondence mode, the permanent magnets are provided with protruding parts protruding out of the end face of the rotor iron core in the axial direction of the shaft hole, and notches are formed in the protruding parts. The permanent magnet rotor at least can solve the problems that the sensitivity of a motor is low and vibration is easy to generate.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor rotor technical field, specifically, a kind of permanent magnet rotor and motor. BACKGROUND

[0002] Permanent magnet synchronous motor (Permanent Magnet Synchronous Motor, PMSM) operating principle and ordinary electric excitation synchronous motor are identical, but it is with permanent magnet excitation instead of excitation winding excitation, it is a kind of synchronous motor using permanent magnet to generate magnetic field, the rotational speed of its rotor and the current frequency of stator winding keep consistent. Compared with ordinary electric excitation synchronous motor, permanent magnet synchronous motor is simpler in structure, can reduce processing and assembly cost, while also can save the collector ring and brush prone to problems, improve the reliability of motor operation. Since no excitation current is needed, there is no excitation loss, which improves the operating efficiency of the motor.

[0003] The axial length of the rotor core of the existing permanent magnet synchronous motor is shorter than the length of the permanent magnet, the rotor core is composed of an integral rotor core, and the permanent magnet and the core are combined and integrally injection molded into a permanent magnet rotor. Although such design is simple in structure, since the permanent magnet is a cuboid, and has large volume and weight, it increases the rotational inertia of the rotor, so that the sensitivity of the motor during operation is low. And the existing permanent magnet rotor is composed of block rotor cores and permanent magnets alternately combined, since there are gaps between the permanent magnets and the cores, if the total gap is biased to a certain position of the rotor during motor operation, the dynamic balance of the rotor will be increased, which causes the motor to easily vibrate. SUMMARY

[0004] The main purpose of the utility model is to provide a kind of permanent magnet rotor and motor, at least solve the problem of low sensitivity and easy vibration of motor.

[0005] According to one aspect of the utility model, a permanent magnet rotor is provided, comprising:

[0006] A rotor core is provided with a shaft hole and a plurality of magnetic steel grooves, and a plurality of magnetic steel grooves are arranged along the outer periphery of the shaft hole;

[0007] Permanent magnets, the permanent magnets include a plurality of, a plurality of permanent magnets are arranged one by one corresponding to a plurality of magnetic steel grooves, along the axial direction of the shaft hole, the permanent magnet has a protruding part protruding from the end face of the rotor core, and the protruding part is provided with a notch.

[0008] Further, the permanent magnet comprises a first main part and a second main part located at an end of the first main part, the first main part is embedded in the magnetic steel slot, the second main part at least partially protrudes from the end surface of the rotor core to form the protruding part, and the notch is arranged on the second main part.

[0009] Further, the first main part is provided with the second main part at both ends in the axial direction of the shaft hole.

[0010] Further, the notch is located at one end of the second main part close to the shaft hole.

[0011] Further, the permanent magnet rotor further comprises a plastic package, and the rotor core further comprises a groove;

[0012] The groove is located on the side of the rotor core close to the permanent magnet, the plastic package is wrapped around the exposed outer surface of the permanent magnet and the rotor core to fix the permanent magnet and the rotor core, and the plastic package is at least partially located in the groove.

[0013] Further, each magnetic steel slot comprises a first slot surface and a second slot surface arranged opposite to each other;

[0014] Among the two adjacent magnetic steel slots, the first slot surface and the second slot surface are alternately arranged in the circumferential direction of the shaft hole, the groove is arranged on one of the first slot surface and the second slot surface, and the groove is arranged through the rotor core in the axial direction of the shaft hole.

[0015] Further, in one magnetic steel slot, the groove comprises at least one, and when the groove is multiple, the multiple grooves are arranged in the radial direction of the shaft hole.

[0016] Further, the rotor core comprises a plurality of independent core blocks, the plurality of core blocks are arranged in the outer periphery of the shaft hole, and the magnetic steel slot is formed between the two adjacent core blocks in the radial direction of the shaft hole, and the end of each core block close to the permanent magnet is provided with a limiting protrusion.

[0017] Further, the rotor core further comprises a first through hole and a second through hole;

[0018] In the radial direction of the shaft hole, the first through hole is closer to the shaft hole than the second through hole, and the first through hole penetrates the core block in the axial direction of the shaft hole, and the first through hole is at least used for fixing the core block.

[0019] The second through hole penetrates the iron core block along an axial direction of the shaft hole, and the second through hole is used at least for positioning the iron core block when the plastic package is performed on the permanent magnet rotor.

[0020] In another aspect, the application also relates to an electric machine comprising the permanent magnet rotor.

[0021] In the utility model, the protruding part of the permanent magnet of the permanent magnet rotor protrudes from the end surface of the rotor iron core along the axial direction of the shaft hole, and the protruding part is provided with a notch, which can solve the problems of low sensitivity and easy vibration of the electric machine. In actual work, the design of the protruding part protruding from the end surface of the rotor iron core can increase the effective magnetic flux of the permanent magnet rotor, and can also optimize the magnetic field distribution of the permanent magnet rotor, so that the permanent magnet rotor has better performance than the existing design of the permanent magnet and the end surface of the rotor iron core. Moreover, the design of the notch can not only meet the requirements of sufficient effective magnetic flux and reasonable magnetic field distribution, but also can reduce the weight of the permanent magnet to a certain extent, thereby reducing the moment of inertia of the whole permanent magnet rotor, so as to prevent the electric machine from starting and stopping difficultly due to the large moment of inertia of the permanent magnet rotor.

[0022] That is to say, compared with the existing permanent magnet rotor, the permanent magnet rotor of the application can solve the problem of low sensitivity of the electric machine by setting a notch on the protruding part to reduce the weight of the permanent magnet, and can also reduce the manufacturing cost of the permanent magnet rotor to a certain extent. BRIEF DESCRIPTION OF DRAWINGS

[0023] The drawings described herein are used to provide further understanding of the utility model and constitute a part of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model, and do not constitute improper limitation on the utility model. In the drawings:

[0024] Figure 1 The structure diagram of the permanent magnet rotor in the first perspective view disclosed by the utility model embodiment is shown in the figure;

[0025] Figure 2 The structure diagram of the permanent magnet rotor in the second perspective view disclosed by the utility model embodiment is shown in the figure;

[0026] Figure 3 The structure diagram of the permanent magnet rotor in the third perspective view disclosed by the utility model embodiment is shown in the figure;

[0027] Figure 4 The structure diagram of the permanent magnet rotor in the fourth perspective view disclosed by the utility model embodiment is shown in the figure;

[0028] Figure 5 The explosion view of the permanent magnet rotor in the fifth perspective view disclosed by the utility model embodiment is shown in the figure;

[0029] Figure 6 The fourth perspective view of the permanent magnet rotor is disclosed for the utility model embodiment;

[0030] Figure 7 The fourth perspective view of the permanent magnet rotor is disclosed for the utility model embodiment;

[0031] Figure 8 The sixth perspective view of the rotor core and the permanent magnet is disclosed for the utility model embodiment;

[0032] Figure 9 The seventh perspective view of the rotor core and the permanent magnet is disclosed for the utility model embodiment;

[0033] Figure 10 The third perspective view of the rotor core is disclosed for the utility model embodiment;

[0034] Figure 11 The first perspective view of the permanent magnet is disclosed for the utility model embodiment;

[0035] Figure 12 The second perspective view of the permanent magnet is disclosed for the utility model embodiment;

[0036] Figure 13 The first perspective view of the core block is disclosed for the utility model embodiment;

[0037] Figure 14 The second perspective view of the core block is disclosed for the utility model embodiment;

[0038] Figure 15 The third perspective view of the core block is disclosed for the utility model embodiment;

[0039] Figure 16 The counter electromotive force simulation waveform diagram of the permanent magnet rotor and the prior art permanent magnet rotor is disclosed for the utility model embodiment.

[0040] Among them, the above-mentioned drawing includes the following drawing marks:

[0041] 10, rotor core; 11, shaft hole; 12, magnetic steel groove; 121, first groove surface; 122, second groove surface; x, axis direction; 13, core block; 131, recess; 132, limiting protrusion; 133, first through hole; 134, second through hole; 20, permanent magnet; 21, first main body part; 22, second main body part; 221, protruding part; 222, notch; 30, plastic package. DETAILED DESCRIPTION

[0042] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0043] It should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the utility model. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and furthermore, it should be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0044] Unless specifically stated otherwise, the relative arrangement of components and steps, numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the utility model. At the same time, it should be understood that the size of each part shown in the drawings is not drawn in proportion to the actual proportion. The technology, method and equipment known to those skilled in the relevant art may not be discussed in detail, but under appropriate circumstances, the technology, method and equipment should be regarded as part of the authorized description. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0045] In order to solve the problem of low sensitivity and easy vibration of the motor, according to the embodiment of the utility model, a permanent magnet rotor is provided. The permanent magnet rotor of the application will be described in detail below in combination with the drawings.

[0046] Referring to Figures 1 to 16 As shown in the drawings, according to the embodiment of the application, a permanent magnet rotor is provided, which comprises a rotor core 10 and a permanent magnet 20.

[0047] Among them, the rotor core 10 is provided with a shaft hole 11 and a plurality of magnetic steel grooves 12, and the plurality of magnetic steel grooves 12 are arranged along the outer periphery of the shaft hole 11. The permanent magnet 20 comprises a plurality of, the plurality of permanent magnets 20 are arranged one by one corresponding to the plurality of magnetic steel grooves 12, along the axial direction of the shaft hole 11, the permanent magnet 20 has a protruding part 221 protruding from the end face of the rotor core 10, and the protruding part 221 is provided with a notch 222.

[0048] In the present application, the permanent magnet 20 of the permanent magnet rotor is provided with a protruding part 221 protruding from the end face of the rotor core 10 along the axial direction of the shaft hole 11 (i.e. Figure 8The protruding part 221 protrudes from the end surface of the rotor core 10 in the direction indicated by the arrow X, and the protruding part 221 is provided with the notch 222, which makes the permanent magnet rotor of the present application be able to solve the problems of low sensitivity and easy vibration of the motor. In actual work, the design that the protruding part 221 protrudes from the end surface of the rotor core 10 can increase the effective magnetic flux of the permanent magnet rotor, and can also optimize the magnetic field distribution of the permanent magnet rotor, so that the permanent magnet rotor of the present application has better performance than the existing design that the permanent magnet 20 is flush with the end surface of the rotor core 10. Moreover, the design of the notch 222 makes the permanent magnet 20 not only meet the requirements of sufficient effective magnetic flux and reasonable magnetic field distribution, but also to a certain extent, reduce the weight of the permanent magnet 20, and further reduce the moment of inertia of the entire permanent magnet rotor, so as to prevent the difficult situation of the motor starting and stopping caused by the large moment of inertia of the permanent magnet rotor.

[0049] That is to say, compared with the existing permanent magnet rotor, the permanent magnet rotor of the present application can solve the problem of low sensitivity of the motor by setting the notch 222 on the protruding part 221 to reduce the weight of the permanent magnet 20, and can also reduce the manufacturing cost of the permanent magnet rotor to a certain extent.

[0050] Further, referring to FIG. 1, Figures 8 to 12 As shown in FIG. 1, the permanent magnet 20 includes a first main part 21 and a second main part 22 located at the end of the first main part 21, the first main part 21 is embedded in the magnetic steel slot 12, the second main part 22 at least partially protrudes from the end surface of the rotor core 10 to form the protruding part 221, and the second main part 22 is provided with the notch 222.

[0051] Specifically, each permanent magnet 20 is installed on the rotor core 10 through the first body part 21 embedded in the magnetic steel slot 12, so that the movement of each permanent magnet 20 along the circumferential direction of the shaft hole 11 can be prevented. Moreover, since the magnetic steel slot 12 is uniformly arranged along the circumferential direction of the shaft hole 11, when each permanent magnet 20 is embedded in the magnetic steel slot 12, the magnetic field generated by each permanent magnet 20 can be centrally symmetric about the axis of the center of the shaft hole 11, and in actual operation, the permanent magnet rotor can run more smoothly. In addition, compared with the prior art permanent magnet rotor whose end surface of the permanent magnet 20 and the rotor core 10 is flush, the present application forms a protruding part 221 on the second body part 22 which protrudes at least partially from the end surface of the rotor core 10. This not only increases the effective magnetic flux and optimizes the magnetic field distribution, but also improves the mechanical strength of the permanent magnet rotor, simplifies the assembly process, facilitates cooling and improves dynamic performance. On the basis of forming the protruding part 221 on the second body part 22 which protrudes at least partially from the end surface of the rotor core 10, the present application removes a part of the permanent magnet 20 on the second body part 22 to form the required notch 222, and the size and number of the notch 222 can be reasonably designed according to actual needs. Moreover, when designing the notch 222, the depth of the notch 222 along the axial direction of the shaft hole 11 cannot be lower than the end surface of the rotor core 10, and the removed permanent magnet 20 cannot be too heavy, so as to avoid affecting the effective magnetic flux and the magnetic field distribution of the permanent magnet 20.

[0052] Further, referring to Figures 8 to 12 As shown in the figure, the two ends of the first body part 21 along the axial direction of the shaft hole 11 are both provided with the second body part 22.

[0053] Specifically, in order to increase the effective magnetic flux of the permanent magnet rotor and optimize the magnetic field distribution to a greater extent, the present application provides the second body part 22 at both ends of the first body part 21 along the axial direction of the shaft hole 11, that is, along the axial direction of the shaft hole 11, the end surface of both ends of each permanent magnet 20 is higher than the end surface of the rotor core 10. Such a design can not only increase the effective magnetic flux of the permanent magnet rotor and optimize the magnetic field distribution, but also can ensure that the weight of the permanent magnet rotor can be more evenly distributed on the motor shaft when the permanent magnet rotor is installed on the motor shaft (not shown in the figure), thereby making the permanent magnet rotor of the present application run more smoothly. In the present application, in order to reduce the weight of the permanent magnet 20 as much as possible within a reasonable atmosphere, the embodiment shows that the second body part 22 is provided at both ends of the first body part 21, and the notch 222 is provided on the second body part 22 at both ends. In other embodiments of the present application, the second body part 22 can be provided only at one end of the first body part 21, and the notch 222 can be provided on the second body part 22.

[0054] Further, referring to Figures 8 to 12As shown, the notch 222 is located at one end of the second body part 22 close to the shaft hole 11. Specifically, in the radial direction of the shaft hole 11, the closer to the shaft hole 11, the more dense the arrangement of the permanent magnets 20, and thus the more effective magnetic flux. Therefore, by setting the notch 222 at one end of the second body part 22 close to the shaft hole 11, the weight of the permanent magnets 20 can be reduced, and the influence on the effective magnetic flux and the magnetic field distribution can be minimized, thereby improving the sensitivity of the motor. In addition, in other embodiments of the present application, the notch 222 can be set at one end of the second body part 22 away from the shaft hole 11, or between the two ends of the second body part 22 close to and away from the shaft hole 11.

[0055] Further, referring to Figures 1 to 7 As shown, the permanent magnet rotor further comprises a plastic encapsulation 30, and the rotor core 10 further comprises a recess 131. The recess 131 is located on the side of the rotor core 10 close to the permanent magnets 20, the plastic encapsulation 30 wraps the permanent magnets 20 and the exposed outer surface of the rotor core 10 to fix the permanent magnets 20 and the rotor core 10, and the plastic encapsulation 30 is at least partially located in the recess 131.

[0056] Specifically, in the radial direction of the shaft hole 11, the plastic encapsulation 30 can wrap the rotor core 10 and the permanent magnets 20 at one end close to the shaft hole 11, or at one end away from the shaft hole 11. In this way, the movement of the rotor core 10 and the permanent magnets 20 in the radial direction of the shaft hole 11 can be prevented, thereby reducing the vibration generated by the motor during operation. Furthermore, in the radial direction of the shaft hole 11, the plastic encapsulation 30 can wrap the permanent magnets 20 at both ends of the permanent magnet rotor, or wrap part of the rotor core 10 at both ends of the permanent magnet rotor. In this way, the movement of the rotor core 10 and the permanent magnets 20 in the axial direction of the shaft hole 11 (i.e. Figure 8The movement of the plastic sealing body 30 can reduce the vibration generated by the motor during operation. In the present application, the plastic sealing body 30 does not wrap the rotor core 10 entirely, but exposes part of the rotor core 10 outside the plastic sealing body 30. Such an arrangement can improve the heat dissipation performance of the permanent magnet rotor, and ensure that the permanent magnet rotor has good dynamic balance, thereby reducing the vibration generated by the permanent magnet rotor during high-speed rotation. Moreover, exposing part of the rotor core 10 outside the plastic sealing body 30 can reduce the manufacturing cost and process complexity of the permanent magnet rotor, and facilitate subsequent maintenance and inspection of the permanent magnet rotor. In addition, in the present application, the plastic sealing body 30 can enter the groove 131 under the action of high pressure to press the permanent magnet 20 to one side, thereby reducing the gap between the rotor core 10 and the permanent magnet 20, and making the rotor core 10 and the permanent magnet 20 fit better, so as to reduce the vibration generated by the permanent magnet rotor during rotation.

[0057] Optionally, referring to FIG. 2, Figures 1 to 7 As shown in FIG. 2, the plastic sealing body 30 is at least partially located between the permanent magnet 20 and the rotor core 10 to press the permanent magnet 20 to one side. Specifically, under the high-pressure environment, the plastic sealing body 30 can not only enter the groove 131, but also enter the gap between the rotor core 10 and the permanent magnet 20 and fill the gap, thereby pressing the permanent magnet 20 to the rotor core 10, eliminating the gap between the rotor core 10 and the permanent magnet 20, and achieving the purpose of reducing the vibration generated by the permanent magnet rotor during rotation.

[0058] Further, referring to FIG. 2, Figures 7 to 10 As shown in FIG. 2, each magnetic steel slot 12 includes a first slot surface 121 and a second slot surface 122. In adjacent two magnetic steel slots 12, the first slot surface 121 and the second slot surface 122 are alternately arranged along the circumferential direction of the shaft hole 11, and the groove 131 is arranged on one of the first slot surface 121 and the second slot surface 122, and the groove 131 is arranged through the rotor core 10 along the axial direction of the shaft hole 11.

[0059] For example, in the present application, the groove 131 can be arranged on the first slot surface 121 alone, or the groove 131 can be arranged on the second slot surface 122 alone. The present embodiment shows the case where the groove 131 is arranged on the first slot surface 121 alone. Since the first slot surface 121 and the second slot surface 122 are two opposite slot surfaces of the magnetic steel slot 12, and the first slot surface 121 and the second slot surface 122 are alternately arranged along the circumferential direction of the shaft hole 11, the groove 131 is located on the slot surface on one side of the magnetic steel slot 12. Such an arrangement can ensure that, after the permanent magnet rotor is plastic sealed in a high-pressure environment, the plastic sealing body 30 can enter the groove 131 and move in the same direction (e.g., the direction indicated by the arrow X) as the permanent magnet 20, thereby reducing the vibration generated by the motor during operation. Figure 7The recess 131 is arranged along the axial direction of the shaft hole 11, so that the plastic sealing body 30 in the recess 131 can uniformly extrude the permanent magnet 20 in the same direction after the plastic sealing of the permanent magnet rotor, so that the plastic sealing body 30 has a better extrusion effect, and the effect of eliminating the gap between the rotor core 10 and the permanent magnet 20 is better.

[0060] Further, referring to FIGS. 1, 2 and 3, Figures 7 to 10 and Figures 13 to 15 As shown in FIGS. 1, 2 and 3, the recess 131 includes at least one at one of the magnetic steel grooves 12, and when the recess is multiple, the multiple recesses are arranged in the radial direction of the shaft hole 11.

[0061] Exemplarily, in the present application, the single-sided groove surface of the magnetic steel groove 12 can include one recess 131, or two recesses 131, or more than two recesses 131. The present embodiment shows the case that the single-sided groove surface of the magnetic steel groove 12 is provided with one recess 131, and the recess 131 is arranged on the first groove surface 121 of each magnetic steel groove 12. When the single-sided groove surface of the magnetic steel groove 12 is provided with multiple recesses 131, in a single magnetic steel groove 12, the multiple recesses 131 are arranged in parallel along the radial direction of the shaft hole 11 and extend along the axial direction of the shaft hole 11 (i.e. the direction indicated by x in the figure). Figure 8 In addition, when the single-sided groove surface of the magnetic steel groove 12 is provided with multiple recesses 131, the plastic sealing body 30 in each magnetic steel groove 12 can uniformly extrude the permanent magnet 20 in the same direction after the plastic sealing of the permanent magnet rotor in a high-pressure environment, so that the rotor core 10 and the permanent magnet 20 can be more closely fitted, and the vibration generated by the permanent magnet rotor during rotation can be reduced.

[0062] Further, referring to FIGS. 1, 2 and 3, Figures 5 to 10 and Figures 13 to 15 As shown in FIGS. 1, 2 and 3, the rotor core 10 includes multiple independent core blocks 13, the multiple core blocks 13 are arranged in the outer periphery of the shaft hole 11, and the magnetic steel groove 12 is formed between the adjacent two core blocks 13, and the end of each core block 13 close to the permanent magnet 20 is provided with a limiting protrusion 132 in the radial direction of the shaft hole 11.

[0063] Specifically, along the radial direction of the shaft hole 11, the first groove surface 121 and the second groove surface 122 of each magnetic steel groove 12 are provided with a limiting protrusion 132 near the end close to the shaft hole 11 and the end away from the shaft hole 11, and each limiting protrusion 132 extends along the axial direction of the shaft hole 11. The limiting protrusion 132 allows each magnetic steel groove 12 to better fix the corresponding permanent magnet 20 in the magnetic steel groove 12, thereby preventing the permanent magnet 20 from moving towards the end close to the shaft hole 11 along the radial direction of the shaft hole 11, and also preventing the permanent magnet 20 from moving towards the end away from the shaft hole 11 along the radial direction of the shaft hole 11. In turn, it can prevent the permanent magnet 20 from shaking in the magnetic steel groove 12 to some extent, avoiding unnecessary vibration of the permanent magnet rotor during rotation.

[0064] Further, referring to Figures 1 to 4 、 Figures 7 to 10 and Figures 13 to 15 , the rotor core 10 further comprises a first through hole 133 and a second through hole 134. Among them, along the radial direction of the shaft hole 11, the first through hole 133 is closer to the shaft hole 11 than the second through hole 134, and the first through hole 133 penetrates the core block 13 along the axial direction of the shaft hole 11, and the first through hole 133 is at least used for fixing the core block 13. The second through hole 134 penetrates the core block 13 along the axial direction of the shaft hole 11, and the second through hole 134 is at least used for positioning the core block 13 when the permanent magnet rotor is plastic encapsulated.

[0065] Specifically, in actual manufacture, a plastic encapsulation mold (not shown in the figure) is needed during plastic encapsulation of the permanent magnet rotor. First, the rotor core 10 and the permanent magnet 20 need to be placed in the plastic encapsulation mold according to the corresponding positions, and the plastic encapsulation mold has positioning members (not shown in the figure) corresponding to the second through holes 134 on the rotor core 10. After the rotor core 10 and the permanent magnet 20 are placed in the plastic encapsulation mold according to the corresponding positions, each positioning member can be inserted into the corresponding second through hole 134, thereby positioning the rotor core 10. Each permanent magnet 20 can also be positioned in the plastic encapsulation mold with the rotor core 10 due to the restraint of the corresponding magnetic steel groove 12. Then, melt the plastic encapsulation material and inject it into the plastic encapsulation mold under high pressure, and the plastic encapsulation material can enter each groove 131, each first through hole 133, and the gap between the rotor core 10 and the permanent magnet 20. Finally, after cooling and solidification, the permanent magnet rotor of the present application can be formed.

[0066] Further, referring to Figures 1 to 16As shown, the application also provides an electric machine (not shown in the figure) comprising the above-mentioned permanent magnet rotor. By installing the permanent magnet rotor of the application into the electric machine, the application sets the notch 222 on the permanent magnet 20 to achieve the purpose of reducing the weight of the permanent magnet rotor, thereby reducing the moment of inertia of the permanent magnet rotor and improving the sensitivity of the electric machine during start, stop and speed change. Moreover, the application sets the groove 131 on the slot surface of the magnetic steel slot 12, so that the plastic sealing body 30 can enter the groove to extrude the permanent magnet 20 in the same direction, thereby eliminating the gap between the rotor core 10 and the permanent magnet 20 to a certain extent, preventing unnecessary vibration of the electric machine during operation, and making the electric machine run more smoothly.

[0067] As can be seen from the above, by setting the permanent magnet rotor composed of the rotor core 10, the permanent magnet 20 and the plastic sealing body 30 and installing the permanent magnet rotor into the electric machine, the application can solve the problems of low sensitivity and easy vibration of the electric machine. The permanent magnet 20 of the prior art is a cuboid shape, and no notch 222 is set on the corresponding position of the permanent magnet 20, so the volume and weight of the permanent magnet 20 are relatively large, which increases the moment of inertia of the permanent magnet rotor and makes the sensitivity of the electric machine during operation lower. Moreover, there is a gap between the permanent magnet 20 and the rotor core 10, and if the total gap is at a certain position in the circumferential direction of the permanent magnet rotor, the dynamic balance of the permanent magnet rotor will be increased, resulting in vibration of the electric machine during operation. By setting the notch 222 on the permanent magnet 20, the application can reduce the weight of the permanent magnet rotor. As shown in the figure, when the notch 222 reduces the weight of the permanent magnet rotor by 15%, the back electromotive force of the permanent magnet rotor of the application is only reduced by 1.5% compared with the existing permanent magnet rotor, which has little effect on the performance of the electric machine. Moreover, by setting the groove 131 on the single-sided slot surface of the magnetic steel slot 12, the gap between the permanent magnet 20 and the rotor core 10 can be eliminated to a certain extent, thereby reducing the unbalance of the permanent magnet rotor and solving the problem of easy vibration of the electric machine. Figure 16

[0068] As can be seen from the above, by setting the permanent magnet rotor composed of the rotor core 10, the permanent magnet 20 and the plastic sealing body 30 and installing the permanent magnet rotor into the electric machine, the application can solve the problems of low sensitivity and easy vibration of the electric machine. The permanent magnet 20 of the prior art is a cuboid shape, and no notch 222 is set on the corresponding position of the permanent magnet 20, so the volume and weight of the permanent magnet 20 are relatively large, which increases the moment of inertia of the permanent magnet rotor and makes the sensitivity of the electric machine during operation lower. Moreover, there is a gap between the permanent magnet 20 and the rotor core 10, and if the total gap is at a certain position in the circumferential direction of the permanent magnet rotor, the dynamic balance of the permanent magnet rotor will be increased, resulting in vibration of the electric machine during operation. By setting the notch 222 on the permanent magnet 20, the application can reduce the weight of the permanent magnet rotor. As shown in the figure, when the notch 222 reduces the weight of the permanent magnet rotor by 15%, the back electromotive force of the permanent magnet rotor of the application is only reduced by 1.5% compared with the existing permanent magnet rotor, which has little effect on the performance of the electric machine. Moreover, by setting the groove 131 on the single-sided slot surface of the magnetic steel slot 12, the gap between the permanent magnet 20 and the rotor core 10 can be eliminated to a certain extent, thereby reducing the unbalance of the permanent magnet rotor and solving the problem of easy vibration of the electric machine.

[0068] As can be seen from the above, the permanent magnet rotor of the application can solve the problems of low sensitivity and easy vibration of the electric machine through simple structural design, and also has the advantage of low manufacturing cost.

[0069] For purposes of the description hereinafter, spatial relative terms, such as "above", "below", "upper", "lower", and the like, can be used to describe the relative position of one element or feature to another as illustrated in the figures. It will be understood that the spatial relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientations depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "up" other elements or features would then be oriented "below" or "down" the other elements or features. Thus, the exemplary term "above" can encompass both an orientation of above and below. The device can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly. Well, the spatial relative terms used herein are for ease of description only and do not limit the protective scope of the present application.

[0070] In addition, it should be noted that the use of "first", "second", and the like words to qualify parts, only for the convenience of the corresponding parts are distinguished, such as no other declaration, the above words have no special meaning, therefore can not be understood as the limitation of the protective scope of the present application.

[0071] The above is only the preferred embodiment of the present application, and is not intended to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protective scope of the present application.

Claims

1. A permanent magnet rotor, characterized by, The application relates to a rotor core (10) provided with an axle hole (11) and a plurality of magnetic steel grooves (12) arranged along the outer periphery of the axle hole (11); a plurality of permanent magnets (20) are arranged one by one with the plurality of magnetic steel grooves (12), and the permanent magnets (20) have a protruding part (221) protruding from the end face of the rotor core (10) along the axial direction of the axle hole (11), and the protruding part (221) is provided with a notch (222). The permanent magnet (20) comprises a first main part (21) and a second main part (22) located at the end of the first main part (21), the first main part (21) is embedded in the magnetic steel groove (12), the second main part (22) at least partially protrudes from the end face of the rotor core (10) to form the protruding part (221), and the second main part (22) is provided with the notch (222). The first main part (21) is provided with the second main part (22) at both ends along the axial direction of the axle hole (11).

2. The permanent magnet rotor of claim 1, wherein The notch (222) is located at one end of the second main part (22) close to the axle hole (11).

3. A permanent magnet rotor according to claim 2, characterised in that, The permanent magnet rotor further comprises a plastic sealing body (30), and the rotor core (10) further comprises a groove (131); 4. The permanent magnet rotor of claim 2, wherein, The groove (131) is located on the side of the rotor core (10) close to the permanent magnet (20), the plastic sealing body (30) is wrapped around the permanent magnet (20) and the exposed outer surface of the rotor core (10) to fix the permanent magnet (20) and the rotor core (10), and the plastic sealing body (30) is at least partially located in the groove (131).

5. The permanent magnet rotor of claim 2, wherein, Each of the magnetic steel grooves (12) comprises a first groove surface (121) and a second groove surface (122) arranged oppositely; In the two adjacent magnetic steel grooves (12), the first groove surface (121) and the second groove surface (122) are alternately arranged along the circumferential direction of the axle hole (11), the groove (131) is arranged on one of the first groove surface (121) and the second groove surface (122), and the groove (131) is arranged through the rotor core (10) along the axial direction of the axle hole (11).

6. A permanent magnet rotor according to claim 5, characterised in that, In one of the magnetic steel grooves (12), the groove (131) comprises at least one, and when the groove (131) is a plurality, the plurality of grooves (131) are arranged along the radial direction of the axle hole (11). The rotor core (10) comprises a plurality of mutually independent core blocks (13) arranged along the outer periphery of the axle hole (11), and the magnetic steel grooves (12) are formed between the two adjacent core blocks (13), and each of the core blocks (13) is provided with a limiting protrusion (132) at the end close to the permanent magnet (20) along the radial direction of the axle hole (11).

7. The permanent magnet rotor of claim 5, wherein, ​ 8. The permanent magnet rotor of any one of claims 1 to 7, characterized in that, ​ 9. A permanent magnet rotor according to claim 8, characterised in that, The rotor core (10) further comprises a first through hole (133) and a second through hole (134); Wherein, along the radial direction of the shaft hole (11), the first through hole (133) is closer to the shaft hole (11) than the second through hole (134), and the first through hole (133) penetrates the core block (13) along the axial direction of the shaft hole (11), and the first through hole (133) is at least used for fixing the core block (13); The second through hole (134) penetrates the core block (13) along the axial direction of the shaft hole (11), and the second through hole (134) is at least used for positioning the core block (13) when the permanent magnet rotor is plastic encapsulated.

10. An electric machine characterized by The motor comprises the permanent magnet rotor according to any one of claims 1 to 9.

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