Rotor and electric machine

Abstract

The application discloses a rotor and a motor. The rotor comprises a rotor core, a plurality of magnets and a plastic package. The rotor core comprises a shaft ring part and a plurality of sector parts which are arranged at intervals around the shaft ring part. A containing groove is formed between two adjacent sector parts to form a plurality of containing grooves. Each magnet is embedded in a containing groove. The plastic package covers the magnets and the rotor core. The plastic package comprises an end face covering part and a side face filling part. The end face covering part covers the magnets on the end face of the rotor core. The side face filling part is connected to the end face covering part and covers the magnets on the side face of the rotor core. Thus, the stability of the rotor during operation is improved, and the performance of the motor is improved.

Description

[0001] The present application is a divisional application of the application with the application date of "2019.9.26", the application number of "201910919368.0", and the application name of "Rotor and motor". TECHNICAL FIELD

[0002] The present application relates to the technical field of motor, in particular to a rotor and motor. BACKGROUND

[0003] DC brushless motor is more and more used in various household appliances due to its simple structure and reliable operation. The permanent magnet rotor of the DC brushless motor is subjected to centrifugal force when rotating at high speed, so the assembly between the rotor shaft, the rotor core and the magnet is the key to stable output power of the rotor, and the assembly stability of the rotor is a problem to be solved for the DC brushless motor. SUMMARY

[0004] The present application mainly provides a rotor and motor to solve the problem of poor rotor stability.

[0005] To solve the above technical problems, one technical solution adopted by the present application is to provide a rotor. The rotor comprises: a rotor core comprising a collar portion and a plurality of sector portions arranged at intervals around the collar portion, two adjacent sector portions forming an accommodation groove to form a plurality of accommodation grooves; a plurality of magnets, each magnet being embedded in an accommodation groove; a plastic covering member covering the magnets and the rotor core; the plastic covering member comprises an end face covering portion and a side face filling portion, the end face covering portion covering the magnets on the end face of the rotor core and exposing the sector portions on the end face of the rotor core; the side face filling portion connects the end face covering portion, covers the magnets on the side face of the rotor core and exposes the sector portions on the side face of the rotor core; the sector portion away from the outer edge of the collar portion extends towards the accommodation groove to form a stop portion, and the magnet abuts against the stop portion; the two stop portions opposite to each other between two adjacent sector portions form a gap, and the side face filling portion is filled in the gap; the end face covering portion comprises a plurality of magnet covering sub-portions and a collar covering sub-portion, and the plurality of magnet covering sub-portions are connected to the collar covering sub-portion in a radial manner; a stop ring is arranged between two adjacent magnet covering sub-portions, and the stop ring is located at the outer periphery of the sector portion.

[0006] To solve the above technical problems, another technical solution adopted by the present application is to provide a motor. The motor comprises the rotor as described above.

[0007] The beneficial effects of the present application are: different from the prior art, the present application discloses a rotor and motor. By setting the plastic covering part including the end face covering part and the side surface filling part, the end face covering part covers the magnet of the rotor core end face, and the side surface filling part is connected with the end face covering part and covers the magnet of the rotor core side surface, thereby improving the stability of the rotor during operation and improving the performance of the motor. The outer edge of the fan-shaped part away from the shaft ring part extends towards the accommodating groove to form a stop part, the magnet abuts against the stop part, the two stop parts opposite to each other between two adjacent fan-shaped parts form a gap, the side surface filling part is filled in the gap, further improving the wrapping of the plastic covering part on the rotor core and the magnet, and facilitating to greatly reduce the magnetic leakage of the rotor core. The end face covering part includes a plurality of magnet covering subparts and a shaft ring covering subpart, the plurality of magnet covering subparts are connected to the shaft ring covering subpart in a radial manner, a stop ring is arranged between two adjacent magnet covering subparts, the stop ring is located at the outer periphery of the fan-shaped part, the stop ring can increase the reliability of the filler fixed on the rotor core, prevent the filler from being thrown off due to centrifugal force when the rotor rotates at high speed, and facilitate personnel to quickly operate the filler to reduce the risk of quality problems. BRIEF DESCRIPTION OF DRAWINGS

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0009] Figure 1 is a structural schematic diagram of an embodiment of the rotor provided by the present application;

[0010] Figure 2 is Figure 1 is a structural schematic diagram of an embodiment of the rotor provided by the present application;

[0011] Figure 3 is Figure 1 is a structural schematic diagram of an embodiment of the rotor provided by the present application;

[0012] Figure 4 is Figure 1 is a structural schematic diagram of an embodiment of the rotor provided by the present application;

[0013] Figure 5 is Figure 4 is a structural schematic diagram of an embodiment of the rotor provided by the present application;

[0014] Figure 6 is Figure 1 is a structural schematic diagram of an embodiment of the rotor provided by the present application;

[0015] Figure 7 is Figure 1A third cross-sectional structure of the rotor along the axial direction;

[0016] Figure 8 is Figure 7 An enlarged structure diagram of the A area in the middle;

[0017] Figure 9 is Figure 6 or Figure 7 An end face structure diagram of the rotor;

[0018] Figure 10 is Figure 1 An exploded structure diagram of the rotor core in the rotor;

[0019] Figure 11 is Figure 10 A structure diagram of the first rotor lamination in the rotor core;

[0020] Figure 12 is Figure 10 A structure diagram of the second rotor lamination in the rotor core;

[0021] Figure 13 is Figure 1 A structure diagram of the fan-shaped part in the rotor core. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0023] If the present application embodiments have descriptions involving "first", "second", etc., the "first", "second", etc. descriptions are only for description purposes, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features with "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of those of ordinary skill in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the protection scope of the present application.

[0024] Reference to an "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. As will be apparent to those of ordinary skill in the art, embodiments described herein can be combined with other embodiments.

[0025] With reference to Figure 1 and Figure 2 , Figure 1 is a structural schematic diagram of an embodiment of a rotor provided by the application, Figure 2 is Figure 1 a schematic diagram of a cross section of the rotor perpendicular to the axial direction.

[0026] In this embodiment, the rotor 100 includes a rotor core 10, a plurality of magnets 20, a plastic package 30, and a rotor shaft 40. The plurality of magnets 20 are embedded in the rotor core 10, the plastic package 30 is wrapped around the rotor core 10, so that the rotor core 10 and the plurality of magnets 20 are combined into a rotor, and the rotor shaft 40 is assembled with a shaft hole 120 on the rotor core 10 to output power through the rotor shaft 40.

[0027] Further referring to Figures 2 to 4 , the rotor core 10 specifically includes a collar portion 12 and a plurality of sector portions 14 arranged at intervals around the collar portion 12. The two adjacent sector portions 14 form a receiving groove 16 therebetween, so that a plurality of receiving grooves 16 are arranged at intervals along the circumferential direction of the collar portion 12 on the rotor core 10. Each receiving groove 16 is provided with a magnet 20, i.e., the plurality of magnets 20 and the plurality of sector portions 14 are alternately arranged along the circumferential direction of the collar portion 12. The shaft hole 120 is arranged on the collar portion 12, and the rotor shaft 40 is assembled with the shaft hole 120, for example, interference fit or clearance fit.

[0028] When the magnet 20 is embedded in the receiving groove 16, the N pole and the S pole of the magnet 20 respectively abut the side surfaces of the two adjacent sector portions 14. The opposite surfaces of the adjacent magnets 20 have the same polarity, i.e., both are S poles or N poles, so that the sector portion 14 clamped by the two adjacent magnets 20 corresponds to S or N magnetic polarity, and the two adjacent sector portions 14 correspond to opposite magnetic polarity.

[0029] In this embodiment, the rotor core 10 includes an even number of sector portions 14, which alternately exhibit opposite S pole and N pole magnetic polarity along the circumferential direction and form a closed magnetic loop. In addition, in order to uniformly distribute the magnetic loop, the plurality of receiving grooves 16 are uniformly distributed along the circumferential direction of the collar portion 12.

[0030] As the built-in magnet structure is adopted, i.e. the magnet 20 is embedded in the accommodating groove 16 of the rotor core 10, the side surface of the rotor core 10 is the side surface of the rotor 100, compared with the scheme of attaching the magnet to the surface of the rotor core, the present application can greatly reduce the air gap length formed when the rotor 100 cooperates with the corresponding stator, thereby reducing the magnetic conduction loss of the air gap and facilitating to greatly improve the magnetic flux in the stator; and the magnet 20 is embedded in the accommodating groove 16 and alternately arranged with the sector-shaped part 14, which can improve the volume rate of the rotor 100 to the magnet 20, and the sector-shaped part 14 can effectively utilize the magnetic flux generated by a pair of magnetic poles of each magnet 20, research shows that the magnetic concentration effect of the rotor 100 is improved by more than 20% compared with the traditional surface-mounted magnet structure.

[0031] The magnet 20 is, for example, a sintered magnet of ferrite type or a neodymium magnet. In the embodiment, the magnet 20 is a cuboid structure, and the magnet 20 is arranged in the accommodating groove 16 and penetrates the rotor core 10 along the axial direction of the rotor core 10. In other embodiments, the magnet 20 can also be other structures such as trapezoidal body, and the present application does not limit this.

[0032] Referring to Figure 2 , the magnet 20 protrudes from the end surface of the rotor core 10, i.e. the axial length of the magnet 20 is greater than the axial length of the rotor core 10. The magnet 20 can protrude from one end surface of the rotor core 10, or both ends of the magnet 20 protrude from the opposite two end surfaces of the rotor core 10, so as to utilize the magnetic concentration effect of the protruding end of the magnet 20 and improve the magnetic flux of the rotor 100.

[0033] In the embodiment, both ends of the magnet 20 protrude from the opposite two end surfaces of the rotor core 10, and the lengths of the magnet 20 protruding from the two end surfaces of the rotor core 10 are different, wherein the end of the magnet 20 protruding from the end surface of the rotor core 10 with a longer length is used to install a sensor, so as to facilitate monitoring the running state of the rotor 100.

[0034] The plastic package 30 is a resin material, which is formed on the rotor core 10 and the magnet 20 by injection molding, and the plastic package 30 is further filled in the gap between the magnet 20 and the rotor core 10.

[0035] In the embodiment, as Figure 2 shown, the rotor shaft 40 and the shaft hole 120 can be fitted by interference.

[0036] In some other embodiments, the hole diameter of the shaft hole 120 is larger than the shaft diameter of the rotor shaft 40, and the plastic package 30 is further filled between the rotor shaft 40 and the inner side of the shaft hole 120. The plastic package 30 has, for example, insulating properties, thereby insulating the rotor shaft 40 from the rotor core 10 to change the electrostatic capacity of the rotor 100, thereby achieving the effect of reducing the shaft voltage. Alternatively, the plastic package 30 is of elastic material, thereby being able to absorb and buffer the tangential torque fluctuation of the rotor core 10 and the rotor shaft 40 during rotation, to reduce the abnormal vibration transmitted through the rotor shaft 40 and reduce the vibration noise. Of course, the plastic package 30 can have the above-mentioned properties at the same time, thereby having the above-mentioned beneficial effects at the same time.

[0037] The outer peripheral wall of the rotor 100 is provided with a debris adsorption groove for adsorbing the fine foreign matter adsorbed during the operation of the rotor 100, reducing the risk of friction between the rotor 100 and the stator during rotation due to the adsorption of metal debris and other foreign matter on the outer peripheral surface of the rotor 100, greatly reducing the failure rate of the rotor 100 in production testing, and improving the performance of the motor containing the rotor core 10.

[0038] The debris adsorption groove is provided on the outer peripheral wall of the rotor 100, and there are various embodiments, which are described in the following multiple examples.

[0039] In the first embodiment, the plastic package 30 is provided with a debris adsorption groove 31.

[0040] Referring to Figure 4 and Figure 5 , the plastic package 30 covers the magnets 20 and is formed on the two end faces and the side face of the rotor core 10, and the portion of the plastic package 30 formed on the side face of the rotor core 20 is provided with a debris adsorption groove 31, which is used to adsorb the fine foreign matter adsorbed during the operation of the rotor 100, reduce the risk of friction between the rotor 100 and the stator during rotation due to the adsorption of metal debris and other foreign matter on the surface of the rotor 100, and improve the performance of the motor containing the rotor 100.

[0041] The plastic package 30 includes an end face covering portion 32 and a side face filling portion 34. The end face covering portion 32 covers the magnets 20 on the end face of the rotor core 10, and exposes the collar portion 12 and the sector portion 14 on the end face of the rotor core 10, i.e. the end face covering portion 32 at least covers the magnets 20 on the end face of the rotor core 10, and exposes at least part of the collar portion 12 and part of the sector portion 14 on the end face of the rotor core 10.

[0042] The end face covering part 32 covers the part of the magnet 20 protruding from the end face of the rotor core 10, and plays a role of axially fixing the magnet 20. Further, a positioning hole can be provided on both opposite sides of the magnet 20 to position the axial length of the magnet 20 protruding from the end face of the rotor core 10.

[0043] In the present embodiment, at least one positioning hole 324 is formed on the end face covering part 32 corresponding to each magnet 20. For example, two positioning holes 324 are formed on the end face covering part 32 corresponding to each magnet 20. The positioning hole 324 is used to position the magnet 20, and the material of the end face covering part 32 can be reduced. Further, the positioning hole 324 can be filled with a material to correct the dynamic balance of the rotor.

[0044] The balance hole 146 is provided on the part of the sector part 14 exposed from the end face covering part 32, and penetrates the sector part 14. The balance hole 146 can reduce the weight of the rotor core 10, and can dissipate heat from the rotor core 10. Further, the balance hole 146 can be filled with a material to correct the dynamic balance of the rotor 100.

[0045] The end face covering part 32 includes a collar covering sub-part 320 and a plurality of magnet covering sub-parts 322 connected to the collar covering sub-part 320 in a radial manner. The collar covering sub-part 320 covers at least part of the collar part 12. Each magnet covering sub-part 322 covers a magnet 20. Spaces are formed between the magnet covering sub-parts 322, and the sector part 14 is exposed.

[0046] Further, the balance hole 146 can be provided on the part of the sector part 14 exposed from the end face covering part 32, and penetrates the sector part 14. The balance hole 146 can reduce the weight of the rotor core 10, and can dissipate heat from the rotor core 10. Further, the balance hole 146 can be filled with a material to correct the dynamic balance of the rotor 100.

[0047] In the present embodiment, the balance hole 146 is provided on each sector part 14. In other embodiments, the balance hole 146 can be provided on only part of the sector parts 14.

[0048] Further, a retaining ring 326 can be provided between two adjacent magnet covering sub-parts 322. The retaining ring 326 is located at the outer periphery of the sector part 14. Therefore, the balance hole 146 is located in the area surrounded by the retaining ring 326, the magnet covering sub-part 322, and the collar covering sub-part 320. Further, the retaining ring 326 can prevent the material from overflowing to the side of the rotor core 10 when the material is filled into the balance hole 146. In addition, the retaining ring 326 can increase the reliability of the material fixed on the rotor core 10, and prevent the material from being thrown off by centrifugal force when the rotor 100 rotates at high speed. Furthermore, the retaining ring 326 can facilitate the quick operation of the material by the personnel, and reduce the risk of quality problems.

[0049] The side filling part 34 connects the end surface covering part 32, covers the magnet 20 on the side surface of the rotor core 10, and exposes the sector part 14 on the side surface of the rotor core 10; the debris adsorption groove 31 is formed in the side filling part 34.

[0050] Optionally, the debris adsorption groove 31 is formed in the side filling part 34 along the axial direction of the rotor core 10. Alternatively, the debris adsorption groove 31 is arranged in the side filling part 34 at an angle relative to the axial direction.

[0051] Optionally, a plurality of debris adsorption grooves 31 are arranged in the side filling part 34, and one debris adsorption groove 31 is formed in the side filling part 34 corresponding to each magnet 20. Alternatively, one debris adsorption groove 31 is formed in the side filling part 34 corresponding to every two magnets 20. Alternatively, a plurality of debris adsorption grooves 31 are formed in the side filling part 34 corresponding to each magnet 20, and the plurality of debris adsorption grooves 31 are distributed along the axial direction.

[0052] It should be noted that the side filling part 34 is connected in alignment with the side surface of the rotor core 10, that is, the connection is smoothly transitioned, so as to reduce the wind resistance borne by the rotor 100 when rotating.

[0053] Specifically, the sector part 14 away from the outer edge of the collar part 12 extends to form a stop part 140 toward the accommodating groove 16, and the magnet 20 abuts against the stop part 140; the two stop parts 140 opposite between two adjacent sector parts 14 form a gap 142, and the existence of the gap 142 is beneficial to greatly reduce the magnetic leakage of the rotor core 10. The side filling part 34 is filled in the gap 142, and the side filling part 34 is connected in alignment with the side surface of the rotor core 10, and the side filling part 34 is connected with the magnet covering sub-part 322 on the two end surfaces of the rotor core 10.

[0054] In the second embodiment, the debris adsorption groove 22 is arranged on the magnet 20.

[0055] Referring to Figure 6 , compared with the first embodiment, the main difference is that one side surface of the magnet 20 is exposed from the side surface of the rotor core 10 and is provided with the debris adsorption groove 22, and then a plurality of debris adsorption grooves 22 are exposed from the side surface of the rotor core 10.

[0056] Specifically, the debris adsorption groove 22 is exposed from the gap 142 formed by the two stop parts 140, and the iron filings and other foreign matters can enter the debris adsorption groove 22 from the gap 142 and be adsorbed and accommodated by the debris adsorption groove 22, so as to avoid the influence of the iron filings and other foreign matters on the performance, noise and reliability of the motor.

[0057] In this embodiment, the plastic-encased member 30 is not filled in the gap 142, i.e. the plastic-encased member 30 does not include the side filling part 34 described above, the plastic-encased member 30 includes the end surface covering part 32, and the debris adsorption groove 22 is exposed from the gap 142.

[0058] Alternatively, the plastic-encased member 30 is also filled in part of the gap 142, so that the plastic-encased member 30 can also be formed on the side surface of the rotor core 10, and the debris adsorption groove 22 is exposed from the gap 142 which is not filled by the plastic-encased member 40.

[0059] In some embodiments, the debris adsorption groove 22 is formed on the magnet 20 along the axial direction of the rotor core 22, i.e. one debris adsorption groove 22 is formed on each magnet 20 along the axial direction.

[0060] In other embodiments, a plurality of debris adsorption grooves 22 are distributed on the side surface of one magnet 20 along the axial direction. Alternatively, a debris adsorption groove 22 is formed on one of every two, three, etc. adjacent magnets 20.

[0061] The debris adsorption groove 22 is provided on the magnet 20, which is equivalent to reducing the volume of the magnet 20. In order to minimize the influence of the volume reduction of the magnet 20 on the performance of the rotor 100, the magnetic field of the magnet 20 is analyzed to determine the reasonable position for opening the debris adsorption groove 22.

[0062] According to the simulation analysis, the magnetic induction intensity of the part of the magnet 20 exposed in the gap 142 is the lowest, and the magnetic induction intensity of the part of the magnet 20 covered by the stopper 140 on both sides adjacent to the lowest magnetic induction intensity is the highest. In order to minimize the influence of the slotting on the magnet 20 on the performance of the rotor 100, and to utilize the high magnetic field on the magnet 20 to attract foreign matters such as iron filings, the debris adsorption groove 22 is opened at the low magnetic field of the magnet 20, and the debris adsorption groove 22 is exposed from the gap 142 to the side surface of the rotor core 10 to attract foreign matters such as iron filings into the debris adsorption groove 22, thereby avoiding the influence of the iron filings on the performance, noise and reliability of the motor.

[0063] In a third embodiment, the rotor core 10 is provided with a debris adsorption groove 144.

[0064] Referring to Figures 7 to 9 Compared with the above-mentioned embodiments, the main difference is that the debris adsorption groove 144 is provided on the side of the sector part 14 away from the collar part 12. The debris adsorption groove 144 can be arranged at any position on the side wall of the sector part 14 away from the collar part 12.

[0065] In the embodiment, the side of the stop portion 140 away from the collar portion 12 is provided with a debris adsorption groove 144. The debris adsorption groove 144 is used to adsorb the tiny foreign matters adsorbed during the operation of the rotor 100, reduce the risk of friction between the rotor core 10 and the stator during rotation due to the adsorption of metal debris and other foreign matters on the surface of the rotor core 10, and is beneficial to improve the performance of the motor containing the rotor core 10.

[0066] Since the cross section of the stop portion 140 is sharply reduced relative to the cross section at other positions of the sector portion 14, the magnetic flux passing through the stop portion 140 is much greater than the magnetic flux passing through the same size cross section of the sector portion 14, even if the stop portion 140 is in a magnetic saturation state, that is, the magnetic induction intensity at the stop portion 140 is high, and the electromagnetic simulation analysis of the rotor core 10 also shows that the magnetic induction intensity at the connection of the stop portion 140 is high. Therefore, the debris adsorption groove 144 is selected to be arranged on the stop portion 140 to adsorb the tiny foreign matters such as iron filings outside the rotor core 10.

[0067] Therefore, the present application fully and effectively utilizes the magnetic field distribution on the rotor core 10, and the debris adsorption groove 144 arranged on the stop portion 140 adsorbs the impurities such as iron filings without adversely affecting the performance of the rotor core 10. In addition, since the magnetic field intensity at the position of the debris adsorption groove 144 is stronger than the magnetic field intensity at other positions of the side surface of the rotor core 10, the debris adsorption groove 144 can effectively adsorb the tiny foreign matters such as iron filings.

[0068] In some embodiments, as shown in Figure 8 The two stop portions 140 with gaps 142 can also be connected in one body, that is, the outer peripheries of the adjacent sector portions 14 are connected to each other, so that the overmold 30 only includes the end face covering portion 32. Similarly, the debris adsorption groove 144 can be arranged at any position on the side wall of the sector portion 14 away from the collar portion 12.

[0069] It should be noted that the above-mentioned debris adsorption grooves (31, 22, 144) can exist simultaneously, exist in one of the three, or exist in two of the three, which can effectively avoid the influence of iron filings and other foreign matters on the performance, noise and reliability of the motor.

[0070] Further combining Figures 10 to 13 In order to reduce the magnetic leakage of the rotor 100, the present application also proposes an embodiment for optimizing the rotor core 10 from the perspective of the structure of the rotor core.

[0071] Referring to Figures 10 to 12 , specifically, the rotor core 10 includes a first rotor lamination group 11, a second rotor lamination group 13 and a third rotor lamination group 15 arranged in sequence.

[0072] As shown in Figure 11As shown, the first rotor lamination set 11 and the third rotor lamination set 15 are both formed by stacking a plurality of first rotor laminations 110, and each first rotor lamination 110 includes a first ring lamination 112 and a plurality of first sector laminations 113 arranged around the first ring lamination 112, and the plurality of first sector laminations 113 in each first rotor lamination 110 are connected to the first ring lamination 112.

[0073] As shown, the second rotor lamination set 13 is formed by stacking a plurality of second rotor laminations 130, and each second rotor lamination 130 includes a second ring lamination 132 and a plurality of second sector laminations 133 arranged around the second ring lamination 132, and the second sector laminations 133 in each second rotor lamination 130 are arranged alternately in connection with and disconnection from the second ring lamination 132. Figure 12

[0074] Among them, the first ring lamination 112 and the second ring lamination 132 are stacked to form the ring portion 12, and the first sector lamination 113 and the second sector lamination 132 are stacked to form the sector portion 14.

[0075] The second sector laminations 133 in the second rotor lamination 130 are arranged alternately in connection with and disconnection from the second ring lamination 132, so that part of the second sector laminations 133 are not connected to the second ring lamination 132, that is, part of the second sector laminations 133 are independent of the second ring lamination 132 and are fixed by other second sector laminations 133 in the adjacent layers, so as to reduce the magnetic leakage; at the same time, the other second sector laminations 133 in the second rotor lamination 130 are connected to the second ring lamination 132, so as to ensure the overall strength of the second rotor lamination set 13, and further ensure the overall strength of the rotor core 10.

[0076] Specifically, the rivet points 116 are arranged at the same positions of the first sector laminations 113 and the second sector laminations 133, and the adjacent two rotor laminations are connected by the rivet points 116, that is, the two first rotor laminations 110, the two second rotor laminations 130 and the first rotor lamination 110 and the second rotor lamination 130 arranged adjacent in the axial direction are all connected by the rivet points 116.

[0077] In the embodiment, in the adjacent two second rotor laminations 130 of the second rotor lamination set 13, the second sector laminations 133 connected to the second ring lamination 132 are stacked with the second sector laminations 133 not connected to the second ring lamination 132.

[0078] ​The plurality of second rotor laminations 130 in the second rotor lamination set 13 can also have other arrangements, for example, half of the plurality of second rotor laminations 130 are stacked with each other, and the other half of the plurality of second rotor laminations 130 are also stacked with each other but are deflected by one second sector 133, thereby forming the second rotor lamination set 13. Alternatively, the second rotor lamination set 13 also includes the first rotor lamination 110, which is distributed between the plurality of second rotor laminations 130. The above is only an example, and the present application does not limit the specific arrangement of the second rotor lamination set 13.

[0079] The structure of the second rotor lamination set 13 can reduce magnetic leakage and improve the back EMF coefficient of the rotor core 10, thereby improving the performance of the rotor 100, and also ensuring the strength of the rotor core 10 itself, and facilitating the reduction of the risk of strength failure caused by centrifugal force during rotation.

[0080] Further, as shown in Figs. 1 and 2, the first ring lamination 112 is provided with a plurality of first limiting columns 117 on the side facing the first sector 113, and the first limiting columns 117 are located between two adjacent first sectors 113. The second ring lamination 132 is provided with a second limiting column 137 on the side facing the second sector 133, and the second limiting column 137 is located between two adjacent second sectors 133. The length of the first limiting column 117 in the radial direction of the first ring lamination 112 is greater than the length of the second limiting column 137 in the radial direction of the second ring lamination 132. Figure 11 Figure 12 Further, as shown in Figs. 1 and 2, the first ring lamination 112 is provided with a plurality of first limiting columns 117 on the side facing the first sector 113, and the first limiting columns 117 are located between two adjacent first sectors 113. The second ring lamination 132 is provided with a second limiting column 137 on the side facing the second sector 133, and the second limiting column 137 is located between two adjacent second sectors 133. The length of the first limiting column 117 in the radial direction of the first ring lamination 112 is greater than the length of the second limiting column 137 in the radial direction of the second ring lamination 132.

[0081] The number of the first limiting columns 117 and the second limiting columns 137 is both a plurality, and they are correspondingly stacked with each other. The longer first limiting columns 117 are used to limit the magnet 20 in the accommodating groove 16, and the shorter second limiting columns 137 are ensured not to contact the magnet 20 and leave a certain air gap between the magnet 20, thereby effectively reducing the magnetic leakage through the second limiting columns 137, and thus reducing the magnetic leakage of the rotor core 10.

[0082] Further, the first sector 113 and the second sector 133 are both provided with a balance hole 146 at the same position, and the balance holes 146 are correspondingly stacked, and the balance holes 146 penetrate the sector portion 14.

[0083] ​The first connection bridges 119, the second connection bridges 135 and the disconnected connection bridges 136 are arranged along the circumferential direction of the rotor core 10. The first connection bridges 119 are arranged between the first ring piece 112 and the first sector pieces 113. The second connection bridges 135 and the disconnected connection bridges 136 are arranged between the second ring piece 132 and the second sector pieces 133.

[0084] The width of the first connection bridges 119, the second connection bridges 135 and the disconnected connection bridges 136 along the circumferential direction of the rotor core 10 is 0.8 to 1.5 times the thickness of the rotor core 10. The thickness of the rotor core 10 is the thickness of the first rotor core 11 and the second rotor core 13. The width of the first connection bridges 119, the second connection bridges 135 and the disconnected connection bridges 136 is the same. In this range, the first connection bridges 119 and the second connection bridges 135 have sufficient strength, and the disconnected connection bridges 136 can effectively reduce the magnetic flux leakage of the rotor core 10.

[0085] Further, the width of the first connection bridges 119 and the second connection bridges 135 is 0.3 to 1 mm. It is verified by experiments that when the width of the first connection bridges 119 and the second connection bridges 135 is greater than 1 mm, the magnetic flux leakage of the rotor 100 increases by more than 10%, and the performance of the motor will be seriously reduced. When the width of the first connection bridges 119 and the second connection bridges 135 is less than 0.3 mm, the strength of the rotor core 10 will be insufficient, and the risk of fatigue fracture during production or use will increase sharply. Therefore, when the width of the first connection bridges 119 and the second connection bridges 135 is 0.3 to 1 mm, the magnetic flux leakage of the rotor 100 can be maintained at a relatively low level, and the strength of the rotor core 10 can be ensured.

[0086] In addition, the length of the disconnected connection bridges 136 along the radial direction of the second ring piece 132 is greater than or equal to 2.5 mm. In this size range, the magnetic flux leakage of the corresponding second sector pieces 133 and the second ring piece 132 can be effectively reduced, thereby improving the performance of the rotor 100.

[0087] Referring to Figure 11 , Figure 13The shaft hole 120 is concentric with the first circular arc segment 141, and the second circular arc segments 143 are eccentric to the shaft hole 120, and the rotor and the stator are usually arranged concentrically, so that the second circular arc segments 143 on both sides form uneven air gaps with the stator, and the air gaps between the second circular arc segments 143 and the stator gradually increase or gradually decrease, thereby reducing the back electromotive force harmonic rate of the motor.

[0088] The outer edges of the first sector 113 and the second sector 133 further include two straight line segments 145 connected to the two second circular arc segments 143 respectively. The straight line segments 145 cover at least the side surface of the stop portion 140, so that when the rotor core 10 is molded, the plastic at the portion of the accommodating groove 16 can flow onto the arc surface of the outer contour of the rotor core 10, i.e. the first circular arc segment 141 and the second circular arc segment 143, thereby better preventing overflow and avoiding friction between the rotor and the stator.

[0089] Further, the application also provides a motor comprising the above rotor 100.

[0090] The motor comprises the rotor 100 and a stator, the stator is nested with the rotor 100, and the rotor 100 can rotate relative to the stator due to electromagnetic effect, thereby outputting power through the rotor shaft 40.

[0091] The motor provided by the application is provided with the debris adsorption groove on the outer peripheral wall of the rotor 100, so as to adsorb and accommodate foreign matters such as iron filings, thereby avoiding the influence of the foreign matters such as iron filings on the performance, noise and reliability of the motor.

[0092] Different from the prior art, the application discloses a rotor and a motor. The debris adsorption groove is arranged on the outer peripheral wall of the rotor, so as to adsorb and accommodate foreign matters such as iron filings, thereby reducing the risk of friction between the foreign matters such as iron filings and the stator due to the adsorption of the foreign matters such as iron filings on the side surface of the rotor core, and meanwhile, the performance of the rotor core is not adversely affected.

[0093] The above description is only an embodiment of the application, and does not limit the patent range of the application, and any equivalent structure or equivalent process transformation according to the content of the specification and the drawings, or direct or indirect application in other related technical fields, are also included in the patent protection range of the application.

Claims

1. A rotor characterized by, The rotor comprises: a rotor core comprising a collar portion and a plurality of sector portions arranged at intervals around the collar portion, two adjacent sector portions forming a receiving groove therebetween to form a plurality of receiving grooves; a plurality of magnets, each of which is embedded in a receiving groove; a plastic package covering the magnets and the rotor core; the plastic package comprises an end surface covering portion and a side surface filling portion, the end surface covering portion covering the magnets on the end surface of the rotor core and exposing the sector portions on the end surface of the rotor core; the side surface filling portion connects the end surface covering portion, covers the magnets on the side surface of the rotor core, and exposes the sector portions on the side surface of the rotor core; the sector portions away from the outer edge of the collar portion extend towards the receiving groove to form a stop portion, and the magnets abut against the stop portion; two stop portions opposite to each other between two adjacent sector portions form a gap, and the side surface filling portion is filled in the gap; the end surface covering portion comprises a plurality of magnet covering sub-portions and a collar covering sub-portion, and a plurality of magnet covering sub-portions are connected to the collar covering sub-portion in a radial manner; a retaining ring is arranged between two adjacent magnet covering sub-portions, and the retaining ring is located at the outer periphery of the sector portion; the rotor core comprises a first rotor lamination group, a second rotor lamination group and a third rotor lamination group arranged in sequence; the first rotor lamination group and the third rotor lamination group are each stacked by a plurality of first rotor laminations, the first rotor lamination comprises a first ring sheet and a plurality of first sector sheets arranged at intervals around the first ring sheet, and the first sector sheets in each first rotor lamination are connected with the first ring sheet; the second rotor lamination group is stacked by a plurality of second rotor laminations, the second rotor lamination comprises a second ring sheet and a plurality of second sector sheets arranged at intervals around the second ring sheet, and the second sector sheets in each second rotor lamination are arranged in an alternating manner with the second ring sheet; wherein the first ring sheet and the second ring sheet are stacked to form the collar portion, and the first sector sheet and the second sector sheet are stacked to form the sector portion.

2. The rotor of claim 1, wherein The rotor further comprises a rotor shaft, the collar portion has a shaft hole, the hole diameter of the shaft hole is larger than the shaft diameter of the rotor shaft, and the plastic package is filled between the rotor shaft and the inner side surface of the shaft hole.

3. The rotor of claim 2, wherein The plastic package has insulating properties.

4. A rotor according to claim 2 or 3, characterised in that The plastic package is made of elastic material.

5. The rotor of claim 1, wherein A debris adsorption groove is arranged on the outer peripheral wall of the rotor.

6. The rotor of claim 5, wherein The debris adsorption groove is arranged on the side surface filling portion.

7. The rotor of claim 5, wherein The debris adsorption groove is arranged on the side of the sector portion away from the collar portion.

8. The rotor of claim 7, wherein The debris adsorption groove is arranged on the side of the stop portion away from the collar portion.

9. The rotor of claim 1, wherein In two adjacent second rotor laminations of the second rotor lamination group, the second sector sheet connected with the second ring sheet and the second sector sheet not connected with the second ring sheet are arranged in a stacked manner.

10. The rotor of claim 1, wherein A first limiting column is formed on the side of the first ring sheet facing the first sector sheet, and the first limiting column is located between two adjacent first sector sheets. The second ring piece is provided with a second limiting column on one side of the second sector piece, and the second limiting column is located between two adjacent second sector pieces; The first limiting column and the second limiting column are arranged in layers, and the length of the first limiting column along the radial direction of the first ring piece is greater than the length of the second limiting column along the radial direction of the second ring piece.

11. The rotor of claim 1, wherein The outer edges of the first sector piece and the second sector piece each include a first circular arc segment concentric with the shaft hole and two second circular arc segments respectively connected to the two ends of the first circular arc segment.

12. The rotor of claim 11, wherein The outer edges of the first sector piece and the second sector piece further include two straight line segments respectively connected to the two second circular arc segments.

13. The rotor of claim 1, wherein The first sector piece is connected to the first ring piece through a first connecting bridge; The second rotor punching piece is provided with a second connecting bridge and a disconnected connecting bridge alternately, wherein a part of the second sector piece is connected to the second ring piece through the second connecting bridge, and another part of the second sector piece is arranged apart from the second ring piece through the disconnected connecting bridge; The ratio of the width of the first connecting bridge, the second connecting bridge and the disconnected connecting bridge to the thickness of the punching piece is 0.8 to 1.5, the width of the first connecting bridge and the second connecting bridge ranges from 0.3mm to 1mm, and the length of the disconnected connecting bridge along the radial direction of the second ring piece is greater than or equal to 2.5mm.

14. An electric machine characterized by The motor comprises the rotor according to any one of claims 1 to 13.

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