Magnetic vane, rotor structure and motor

Abstract

The invention discloses a magnetism isolating plate, a rotor structure and a motor, and relates to the technical field of motors, the magnetism isolating plate is provided with a first side and a second side which are oppositely arranged in the thickness direction, the first side is used for abutting against a rotor lamination, the magnetism isolating plate is further provided with a pressure applying area and an edge area, and the edge area is annularly arranged on the outer side of the pressure applying area; the edge area protrudes out of the pressure application area on the first side; according to the technical scheme provided by the invention, the edge region protrudes out of the pressure region on the first side, and when the pressure region is subjected to external force, the whole magnet vane deforms to enable the first side to be attached to the rotor lamination, so that the rotor lamination is uniformly stressed, edge warping of the rotor lamination is prevented, and the service life of the rotor lamination is prolonged. Therefore, the technical effect of improving the NVH performance of the motor is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a magnetic isolation plate, a rotor structure and a motor. Background Art

[0002] In traditional motor rotor design, the magnetic shielding plate is usually set as a horizontal plane, and in actual press-fitting, the rotor is usually only pressed by pressing the inner ring of the magnetic shielding plate, which will cause uneven force on the inner and outer sides of the rotor, thereby increasing the noise of motor operation. Due to the uneven force on the magnetic shielding plate, the inner ring has a large deformation and the peripheral side has a small deformation. The peripheral side of the magnetic shielding plate has a poor pressing effect on the rotor laminations, which will cause the rotor laminations to warp, which will intensify the air vibration caused by the change of the magnetic field, and then produce abnormal noise.

[0003] Therefore, existing motors have the problem of poor NVH (NVH is the abbreviation of noise, vibration and harshness) performance. Summary of the invention

[0004] The main purpose of the present invention is to provide a magnetic isolation plate, a rotor structure and a motor, and in particular to a magnetic isolation plate for improving the NVH performance of the motor.

[0005] To achieve the above-mentioned purpose, the magnetic isolation plate proposed in the present invention has a first side and a second side arranged opposite to each other in the thickness direction, the first side is used to abut against the rotor laminations, and the magnetic isolation plate also has a pressure area and an edge area, the edge area is arranged around the outside of the pressure area; wherein the edge area protrudes from the pressure area on the first side.

[0006] In one embodiment, the first side of the magnetic isolation plate is tilted along its radial direction, and the tilt angle is A, 3°≤A≤10°.

[0007] In one embodiment, an annular groove is provided on the first side of the magnetic isolation plate, and the annular groove is located between the pressure area and the edge area.

[0008] In one embodiment, an annular protrusion is provided on the second side of the magnetic isolation plate corresponding to the annular groove.

[0009] The present invention further provides a rotor structure, which includes:

[0010] The magnetic isolation plate has a first side and a second side which are arranged opposite to each other in the thickness direction, wherein the first side is used to abut against the rotor laminations, and the magnetic isolation plate also has a pressure region and an edge region, wherein the edge region is arranged around the outside of the pressure region; wherein the edge region protrudes from the pressure region on the first side;

[0011] Rotating shaft;

[0012] A plurality of rotor laminations are sleeved on the rotating shaft and stacked axially along the rotating shaft;

[0013] The magnetic isolation plates are provided in two numbers and are sleeved on the rotating shaft and arranged on both sides of the multiple rotor laminations in the axial direction of the rotating shaft to limit the multiple rotor laminations.

[0014] In one embodiment, the rotor laminations include mounting holes, and among the plurality of rotor laminations, the mounting hole of at least one rotor lamination is offset from the mounting hole of another rotor lamination.

[0015] In one embodiment, the mounting holes of the plurality of rotor laminations are connected to form a filling cavity, and the rotor structure comprises:

[0016] A plurality of magnetic steels, correspondingly mounted in the plurality of mounting holes;

[0017] The injection molded part is filled in the filling cavity to fix the plurality of rotor laminations in connection.

[0018] In one embodiment, the rotor laminations have an axial through hole, and the through hole is interference fit with the rotating shaft.

[0019] In one embodiment, the side wall of the through hole is provided with a plurality of corresponding grooves, and the plurality of corresponding grooves extend in the axial direction and are arranged at intervals in the circumferential direction.

[0020] The present invention further provides a motor, the motor comprising a rotor structure, the rotor structure comprising:

[0021] The magnetic isolation plate has a first side and a second side which are arranged opposite to each other in the thickness direction, wherein the first side is used to abut against the rotor laminations, and the magnetic isolation plate also has a pressure region and an edge region, wherein the edge region is arranged around the outside of the pressure region; wherein the edge region protrudes from the pressure region on the first side;

[0022] Rotating shaft;

[0023] A plurality of rotor laminations are sleeved on the rotating shaft and stacked axially along the rotating shaft;

[0024] The magnetic isolation plates are provided in two numbers and are sleeved on the rotating shaft and arranged on both sides of the multiple rotor laminations in the axial direction of the rotating shaft to limit the multiple rotor laminations.

[0025] The technical solution of the present invention is to design the first side of the magnetic isolation plate so that the edge area protrudes the pressure area on the first side. Since the first side of the magnetic isolation plate is used to abut against the magnetic isolation plate, the pressure area on the first side of the magnetic isolation plate is farther away from the rotor laminations than the edge area on the first side when the magnetic isolation plate is not subjected to external force. When assembling the rotor structure, the pressure area on the second side of the magnetic isolation plate is used to apply pressure to press the rotor laminations. Since the force on the magnetic isolation plate is concentrated in the pressure area, the deformation of the magnetic isolation plate in the pressure area toward the first side is larger. After the magnetic isolation plate is pressed by external force, plastic deformation occurs. The first side of the magnetic isolation plate is close to a plane and can be well fitted with the rotor laminations, so that the force is uniform at all places where the first side of the magnetic isolation plate contacts the rotor laminations, thereby reducing the noise of the motor operation. Since the magnetic isolation plate after being subjected to force can be well fitted with the rotor laminations and is subjected to force uniformly, the rotor laminations can be further prevented from warping, and the air vibration caused by the change of the magnetic field can be avoided to be aggravated, thereby avoiding abnormal noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1 A full cross-sectional schematic diagram of an embodiment of a magnetic isolation plate provided by the present invention;

[0028] Figure 2 This is a schematic structural diagram of an embodiment of a rotor structure provided by the present invention.

[0029] Figure 3 for Figure 2 A full cross-sectional diagram of the mid-rotor structure;

[0030] Figure 4 for Figure 2 Schematic diagram of the structure of the rotor laminations of the mid-rotor structure.

[0031] Description of Figure Numbers:

[0032] 100. Magnetic isolation plate; 1. First side; 2. Second side; 3. Pressure area; 4. Edge area; 5. Annular groove; 6. Annular protrusion; 1000. Rotor structure; 200. Rotating shaft; 300. Rotor laminations; 310. Mounting hole; 400. Filling cavity; 500. Magnet.

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] In traditional motor rotor design, the magnetic shielding plate is usually set as a horizontal plane, and in actual press-fitting, the rotor is usually only pressed by pressing the inner ring of the magnetic shielding plate, which will cause uneven force on the inner and outer sides of the rotor, thereby increasing the noise of motor operation. Due to the uneven force on the magnetic shielding plate, the inner ring has a large deformation and the peripheral side has a small deformation. The peripheral side of the magnetic shielding plate has a poor pressing effect on the rotor laminations, which will cause the rotor laminations to warp, which will intensify the air vibration caused by the change of the magnetic field, and then produce abnormal noise.

[0038] Therefore, existing motors have the problem of poor NVH (NVH is the abbreviation of noise, vibration and harshness) performance.

[0039] The invention provides a magnetic isolation plate.

[0040] See also Figure 1In one embodiment of the present invention, the magnetic isolation plate 100 has a first side 1 and a second side 2 which are arranged opposite to each other in the thickness direction, and the first side 1 is used to abut against the rotor laminations 300. The magnetic isolation plate 100 also has a pressure area 3 and an edge area 4, and the edge area 4 is arranged around the outside of the pressure area 3; wherein the edge area 4 protrudes from the pressure area 3 on the first side 1.

[0041] The technical solution of the present invention is to design the first side 1 of the magnetic isolation plate 100 so that the edge area 4 protrudes the pressure area 3 on the first side 1. Since the first side 1 of the magnetic isolation plate 100 is used to abut against the rotor laminations 300, when the magnetic isolation plate 100 is not subjected to external force, the pressure area 3 on the first side 1 is farther from the rotor laminations 300 than the edge area 4 on the first side 1. When the rotor structure 1000 is assembled, the pressure area 3 on the second side 2 of the magnetic isolation plate 100 is used to apply pressure. The rotor laminations 300 are pressed by force. Since the force on the magnetic isolation plate 100 is concentrated in the pressure area 3, the deformation of the magnetic isolation plate 100 in the direction toward the first side 1 of the pressure area 3 is larger. After the magnetic isolation plate 100 is pressed by external force, plastic deformation occurs. The first side 1 of the magnetic isolation plate 100 is close to a plane and can fit well with the rotor laminations 300, so that the force is uniform at all points where the first side 1 of the magnetic isolation plate 100 contacts the rotor laminations 300, thereby reducing the noise of the motor operation. Since the magnetic isolation plate 100 after being subjected to force can fit well with the rotor laminations 300 and is subjected to uniform force, the rotor laminations 300 can be further prevented from warping, and the air vibration caused by the change of the magnetic field can be avoided to be aggravated, thereby avoiding abnormal noise.

[0042] Since the force range of the magnetic isolation plate 100 is the pressure area 3 of the second side 2, but since the magnetic isolation plate 100 is a whole, the edge area 4 of the magnetic isolation plate 100 will also move accordingly, and the force exerted on the pressure area 3 will also be transmitted to the edge area 4. The closer to the edge position of the magnetic isolation plate 100, the smaller the force exerted, and the smaller the corresponding deformation amount. That is: the deformation amount of the magnetic isolation plate 100 from the center position to the edge position and toward the first side 1 gradually decreases. According to the relationship between this deformation amount and position, and to make the first side 1 of the magnetic isolation plate 100 fit with the rotor lamination 300, the force exerted on the rotor lamination 300 is uniform. Therefore, the first side 1 of the magnetic isolation plate 100 is tilted along its radial direction. The edge position of the magnetic isolation plate 100 is in contact with the rotor lamination 300 at first, and the first side 1 of the magnetic isolation plate 100 gradually moves away from the rotor lamination 300 along its own radial direction and toward the center direction to compensate for the deformation amount of the magnetic isolation plate 100. According to the applied pressure of the press equipment, the force-bearing area of ​​the magnetic isolation plate 100, and the material properties (stiffness, etc.) of the magnetic isolation plate 100 (alloy steel), the bevel angle A can be calculated, and the range of A is: 3°≤A≤10°.

[0043] In order to prevent a large stress concentration from occurring at the junction of the pressure area 3 and the edge area 4, the first side 1 of the magnetic isolation plate 100 is provided with an annular groove 5, and the annular groove 5 is located between the pressure area 3 and the edge area 4. The function of the groove is to achieve force transmission, so as to avoid stress concentration in the pressure area 3 of the magnetic isolation plate 100 when the magnetic isolation plate 100 is pressed, thereby causing excessive deformation, etc. After the groove is provided, the pressing machine applies force to the pressure area 3 of the magnetic isolation plate 100, and the groove can transfer part of the pressing force to the edge area 4 of the magnetic isolation plate 100, and the rotor laminations 300 are pressed by using the pressing force transferred to the edge area 4, so as to avoid the rotor laminations 300 from warping on the outer peripheral side of the rotor laminations 300 due to the pressing force of the pressure area 3.

[0044] In order to define the pressure application area 3, an annular protrusion 6 is provided on the second side 2 of the magnetic isolation plate 100 corresponding to the annular groove 5. The annular protrusion 6 limits the pressure application area 3, which is convenient for press-fitting.

[0045] See also Figures 2 to 4 The present invention further proposes a rotor structure 1000, which includes a rotating shaft 200, a plurality of rotor laminations 300 and a magnetic isolation plate 100. The specific structure of the magnetic isolation plate 100 refers to the above embodiment. Since the rotor structure 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0046] The rotor structure 1000 also includes: a rotating shaft 200 and a plurality of rotor laminations 300; the plurality of rotor laminations 300 are sleeved on the rotating shaft 200 and stacked axially along the rotating shaft 200; two magnetic isolation plates 100 are provided, sleeved on the rotating shaft 200, and axially arranged on both sides of the plurality of rotor laminations 300 on the rotating shaft 200 to limit the plurality of rotor laminations 300.

[0047] In order to improve the electromagnetic performance of the motor and reduce mechanical vibration, and further enhance the NVH performance of the motor, the motor is provided with an oblique pole structure. The rotor lamination 300 includes a mounting hole 310. Among the multiple rotor laminations 300, at least one mounting hole 310 of the rotor lamination 300 is staggered with the mounting hole 310 of another rotor lamination 300. Among them, the mounting hole 310 is used to install the magnetic steel 500. Since the mounting holes 310 of different rotor laminations 300 are staggered, the magnetic steel 500 installed in the mounting hole 310 of the rotor lamination 300 is also staggered, forming an oblique pole structure. Through the design of the oblique pole structure, the specific subharmonic components in the torque pulsation of the motor can be weakened, thereby improving the electromagnetic torque waveform of the motor and reducing vibration and noise. The existence of the oblique pole structure can also reduce the magnetic resistance loss of the motor during operation, thereby reducing the temperature rise and energy consumption of the motor. By adjusting the position of the rotor magnetic pole, the torque pulsation caused by the stator tooth slot can be weakened, and the running stability of the motor can be improved. The rotor with skewed pole structure helps to improve the output torque and power of the motor, making the power density of the motor higher, which is particularly beneficial for high-power applications. The skewed pole structure helps to reduce the harmonic content inside the motor and improve the electromagnetic performance of the motor.

[0048] The poor concentricity of the magnets 500 installed in different mounting holes 310 will cause additional unbalanced forces to be generated when the motor is running. These forces will be converted into vibration and noise, reducing the smoothness of the motor's operation and resulting in poor NVH performance of the motor. In addition, long-term vibration and unbalanced loads will accelerate the wear of the internal parts of the motor, thereby shortening the service life of the motor. The offset of the magnet 500 may cause asymmetry in the magnetic circuit, reduce the effective magnetic flux, and thus reduce the efficiency of the motor. Concentricity problems may affect the dynamic response characteristics of the motor, causing the motor to perform poorly during rapid start-up or speed changes. Due to vibration and imbalance, the motor may require more frequent maintenance and calibration, increasing operating costs. In order to ensure the high performance and reliability of the motor, the concentricity of the magnet 500 needs to be strictly controlled during the manufacturing process, and measures should be taken during the motor design to minimize the impact of concentricity deviation.

[0049] In order to improve the overall concentricity of the magnetic steel 500, the mounting holes 310 of the plurality of rotor laminations 300 are connected, and the plurality of connected mounting holes 310 form a filling cavity 400. The rotor structure 1000 includes: a plurality of magnetic steels 500 and injection molded parts, wherein the plurality of magnetic steels 500 are correspondingly mounted in the plurality of mounting holes 310; the injection molded parts are filled in the filling cavity 400 to fix the plurality of rotor laminations 300 in connection. The injection molded parts are filled in the filling cavity 400 in an injection molding manner. The integrally-injected rotor lamination 300 structure can realize the oblique pole structure of the rotor during injection molding, and can improve the concentricity of the overall magnetic steel 500. In addition, since the rotor realizes the oblique pole structure during injection molding, a positioning keyway may not be provided on the rotating shaft 200, which simplifies the design structure of the rotating shaft 200 and the rotor while reducing the cost.

[0050] The rotor oblique pole structure is realized by integral injection molding, so that the optical axis rotating shaft 200 can be used, and the overall concentricity of the magnetic steel 500 can be improved, simplifying the processing process of the rotor punching and the rotating shaft 200. In order to achieve the circumferential and axial fixation of the rotating shaft 200. The rotor lamination 300 has an axial through hole, and the through hole is interference fit with the rotating shaft 200. This arrangement and placement is more concise during part processing and assembly. The injection-molded rotor structure 1000 can realize the rotor oblique pole structure during injection molding, and can improve the concentricity of the overall magnetic steel 500. In addition, since the rotor realizes the oblique pole structure during injection molding, a positioning keyway may not be provided on the rotating shaft 200, simplifying the design structure of the rotating shaft 200 and the rotor while reducing costs. The integral injection molding of the rotor structure 1000 with an optical axis proposed by the present invention cooperates with the inclined magnetic isolation plate 100, which can further prevent the rotor lamination 300 from being scattered or deformed during press assembly. Among them, in actual motor design, different brands of magnetic steel 500 and the placement method of magnetic steel 500 will affect the size of the electromagnetic force of the motor. The selection of magnetic steel 500 can be comprehensively considered in combination with the brand of magnetic steel 500 and the placement position of magnetic steel 500.

[0051] The oblique pole structure is composed of the magnetic steel 500 installed in the mounting holes 310 of different rotor laminations 300, which are staggered in the circumferential direction. The staggered angle affects the performance and effect of the oblique pole structure. How to determine the staggered angle, how to achieve the desired staggered angle. In order to solve the above problems, the side wall of the through hole is provided with a plurality of corresponding grooves, and the plurality of corresponding grooves extend along the axial direction and are arranged at intervals along the circumferential direction. For example: the side wall of the through hole is provided with 36 corresponding grooves, or corresponding teeth, then the interval between two adjacent corresponding grooves is 10 degrees, when the corresponding groove a1 of the first rotor lamination 300 corresponds to the corresponding groove a2 of the second rotor lamination 300, the staggered angle is 0, if the staggered 20 degrees is required, then one of the rotor laminations 300 is rotated so that the corresponding groove a1 is spaced by one corresponding groove from the corresponding groove a2, then the first rotor lamination 300 and the second rotor lamination 300 are staggered 20 degrees in the circumferential direction, and the angle of the oblique pole structure is also 20 degrees.

[0052] In the prior art: the patent "A kind of automotive permanent magnet motor rotor punching sheet and its oblique pole structure", publication number CN113489189A, the invention discloses a kind of automotive permanent magnet motor rotor punching sheet and its oblique pole structure, the rotor punching sheet comprises an inner punching sheet and an outer punching sheet, the center of the inner punching sheet is provided with a shaft mounting hole for fixing and installing the shaft, the side wall of the shaft mounting hole is provided with a plurality of shaft matching keyways, the outer wall of the inner punching sheet is provided with a plurality of matching keys, the inner wall of the outer punching sheet is provided with corresponding matching keyways, the inner punching sheet and the outer punching sheet are fixedly connected by interference fit between the matching keys and the matching keyways; the outer punching sheet is provided with a circle of first magnetic steel grooves distributed in the inner layer and an equal circle of second magnetic steel grooves distributed in the outer layer, the outer punching sheet is provided with a straight axis groove on the outer wall in the straight axis direction, and the outer punching sheet is provided with a cross axis groove on the outer wall in the cross axis direction. According to the above-mentioned prior art, it has the following disadvantages: 1. The interference fit between the inner and outer punches may cause deformation of the punches: the rotor punches are arranged in two parts, the inner and outer punches, and the outer and inner punches are interference fit through the keyway, and the punches themselves are easy to deform. After the interference fit, the punches need to be pressed onto the shaft. At this time, the connection between the inner and outer rotors will be subjected to a large pressing force, which may cause the rotor to warp and other phenomena. 2. The processing difficulty of the punches and the shaft is increased: the invention sets a plurality of keyways on the inner rotor punches and a plurality of matching keyways on the shaft, and uses the matching between the keyways to achieve the oblique pole effect. This method first adds an inner rotor punch and a punch structure of a state. At the same time, corresponding matching grooves need to be set on the shaft. The more grooves are opened on the shaft, the higher the corresponding cost and processing difficulty will be. 3. The rotor punching is divided into two parts, which may affect the output performance: the rotor punching is divided into an inner rotor on the side close to the shaft. When the outer diameter of the inner rotor is set unreasonably or too large, it will affect the magnetic circuit of the magnet, causing the original magnetic circuit to change. Compared with the same size magnet under the complete rotor punching, the torque generated may be smaller, which may affect the output performance of the motor.

[0053] In another prior art: Patent "A motor rotor and permanent magnet synchronous motor", publication number CN111082567A, this invention belongs to the field of motor technology, and there is a motor rotor and a permanent magnet synchronous motor. A motor rotor includes a rotating shaft and a rotor core sleeved on the rotating shaft, the rotor core includes a plurality of segment assemblies, each segment assembly includes a plurality of rotor segments, key slots are provided on the rotor segments, the key slots on adjacent rotor segments are deflected by an angle α, and a plurality of grooves are evenly spaced along the circumference on the circumferential surface of each rotor segment. The motor rotor can assemble a plurality of identical rotor segments through the skew pole, so that the process procedure is relatively simple when producing the rotor segments, and there are only one state of rotor segments. At the same time, a plurality of grooves are provided on the circumferential surface of the rotor segments, which can form a non-uniform air gap between the motor rotor and the motor stator, thereby changing the harmonic content of the electromagnetic force to better reduce the motor noise. According to the above-mentioned prior art, it has the following disadvantages: 1. Increased difficulty in the processing technology of the shaft: This invention achieves the skewed pole assembly effect by setting a keyway on the rotor segment and utilizing a rotor segment structure, but a groove needs to be set on the rotating shaft to cooperate with the keyway of the rotor segment. When the keyway of the overlapping rotor segment is deflected by an angle α, the setting position of the groove on the rotating shaft will change, thereby increasing the difficulty of the processing technology of the rotating shaft. 2. Difficulty in manufacturing skewed poles: In this invention, the keyway of each segment of the rotor segment is offset by an angle α to achieve skewed pole assembly, and the actual skewed pole angle is very small. If a keyway with an offset angle is set on the rotor segment, it is more difficult to implement considering the tolerance. The keyway setting may overlap with other segments due to the tolerance, thereby failing to achieve the skewed pole effect. In addition, when the rotor segment is assembled on the rotating shaft, the small phase misalignment angle will lead to difficulty in identification, thereby posing a greater risk of assembly errors. 3. Subsequent adjustments are difficult and complicated: This invention determines the overall skew-pole assembly structure when designing the rotor segments, and sets a keyway with a fixed angle on each rotor segment. If the skew-pole structure fails to achieve the function of changing the harmonic content of the electromagnetic force after assembly, then when the skew-pole structure needs to be adjusted, it is necessary to re-produce the rotor segments and adjust the keyway angles of the rotor segments, which makes the verification operation difficult and complicated.

[0054] In general, the present invention provides a motor rotor structure 1000, comprising: a rotor lamination 300, a magnetic isolation plate 100, and a rotating shaft 200. The rotor lamination 300 is an integral injection-molded structure. Figure 3The cross-sectional view of the rotor structure 1000 along a certain diameter of the rotating shaft 200 is shown. Each stack of the rotor laminations 300 is arranged at a certain oblique angle along the rotating shaft 200. During production, the rotor laminations 300 arranged at a certain oblique angle are sleeved on the rotating shaft 200 mold. The injection molding material passes through the gap between the magnetic steel 500 and the mounting groove and the area where the grooves of each stack of magnetic steel 500 overlap when the pole is oblique, so as to realize the one-piece injection molding of multiple stacks of rotor laminations 300. The one-piece injection molded rotor laminations 300 can operate stably under multiple working conditions of the motor and have good NVH performance. After the rotor laminations 300 are one-piece injected, there is no need to open a positioning keyway on the corresponding rotating shaft 200, which can make the processing of the rotating shaft 200 simpler and lower in cost. The rotor laminations 300 are provided with mounting holes 310 for placing the magnetic steel 500, and there are redundant cavities for filling the injection molding material to form an injection molded part. The injection molded part makes multiple magnetic steels 500 and multiple rotor laminations 300 into an integrated structure. After the magnetic steel 500 is placed on the rotor lamination 300, each stack of rotor laminations 300 passes through the corresponding grooves set on the inner wall of the through hole of the rotor lamination 300. The number of corresponding grooves is n, and the angle between two adjacent corresponding grooves is B, n*B=360°. Assuming that the required angle is C at this time, each stack of rotor laminations 3001 realizes the oblique pole structure of the rotor by staggering (C / B) corresponding grooves. At this time, the multiple stacks of rotor laminations 300 staggered at a certain angle are sleeved on the mold of the rotating shaft 200, and the gap between the mounting hole 310 and the magnetic steel 500 is filled by injection molding through the filling cavity 400, so that the magnetic steel 500 will not move in the mounting hole 310, and at the same time, it is ensured that the oblique pole angle of the rotor lamination 300 still exists and remains unchanged when it is taken out from the mold of the rotating shaft 200, thereby realizing the integrated structure of the rotor lamination 300. After the integral injection molding, the integrally-molded rotor laminations 300 with oblique poles are pressed together with the rotating shaft 200 by interference fit. At this time, since the rotor has achieved the oblique poles of the rotor through corresponding grooves and integral injection molding, there is no need to set a keyway on the rotating shaft 200, thereby simplifying the structure of the rotor rotating shaft 200 and achieving better versatility.

[0055] The present invention also proposes a motor, which includes a rotor structure 1000, and the rotor structure 1000 includes: a magnetic isolation plate 100, a rotating shaft 200 and a plurality of rotor laminations 300; the magnetic isolation plate 100 has a first side 1 and a second side 2 which are arranged opposite to each other in the thickness direction, the first side 1 is used to abut against the rotor laminations 300, the magnetic isolation plate 100 also has a pressure area 3 and an edge area 4, the edge area 4 is arranged around the outside of the pressure area 3; wherein the edge area 4 protrudes from the pressure area 3 on the first side 1; a plurality of rotor laminations 300 are sleeved on the rotating shaft 200 and stacked axially along the rotating shaft 200; two magnetic isolation plates 100 are provided, which are sleeved on the rotating shaft 200 and are arranged on both sides of the plurality of rotor laminations 300 in the axial direction of the rotating shaft 200 to limit the plurality of rotor laminations 300.

[0056] The motor in the embodiment of the present invention has good NVH performance. Better NVH performance will reduce the noise and vibration generated inside the vehicle, improve the riding experience of passengers, and especially reduce the fatigue of passengers during long-distance driving. Good NVH performance will reduce the wear of vehicle parts and extend the service life of parts, thereby improving the overall durability of the vehicle, reducing the maintenance cost of the vehicle, and improving the economy of the vehicle. Good NVH performance is one of the important indicators of automobile quality. Good NVH performance is beneficial to the image of the vehicle brand and increases market competitiveness.

[0057] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A magnetic isolation plate, characterized in that: It has a first side and a second side which are arranged opposite to each other in the thickness direction, the first side is used to abut against the rotor laminations, the magnetic isolation plate also has a pressure area and an edge area, and the edge area is arranged around the outside of the pressure area; Therein, the edge region protrudes beyond the pressure region on a first side.

2. The magnetic isolation plate according to claim 1, characterized in that: The first side of the magnetic isolation plate is tilted along its radial direction, and the tilt angle is A, 3°≤A≤10°.

3. The magnetic isolation plate according to claim 2, characterized in that: An annular groove is disposed on the first side of the magnetic isolation plate, and the annular groove is located between the pressure application area and the edge area.

4. The magnetic isolation plate according to claim 3, characterized in that: An annular protrusion is arranged on the second side of the magnetic isolation plate corresponding to the annular groove.

5. A rotor structure, characterized in that: The rotor structure comprises the magnetic isolation plate according to any one of claims 1 to 4, and further comprises: Rotating shaft; A plurality of rotor laminations are sleeved on the rotating shaft and stacked axially along the rotating shaft; The magnetic isolation plates are provided in two numbers and are sleeved on the rotating shaft and arranged on both sides of the multiple rotor laminations in the axial direction of the rotating shaft to limit the multiple rotor laminations.

6. The rotor structure according to claim 5, characterized in that: The rotor laminations include mounting holes, and among the plurality of rotor laminations, the mounting hole of at least one rotor lamination is staggered with the mounting hole of another rotor lamination.

7. The rotor structure according to claim 6, characterized in that: The mounting holes of the plurality of rotor laminations are connected and arranged, and the plurality of connected mounting holes form a filling cavity, and the rotor structure comprises: A plurality of magnetic steels, correspondingly mounted in the plurality of mounting holes; The injection molded part is filled in the filling cavity to fix the plurality of rotor laminations in connection.

8. The rotor structure according to claim 7, characterized in that: The rotor laminations have an axial through hole, and the through hole is interference-fitted with the rotating shaft.

9. The rotor structure according to claim 6, characterized in that: The side wall of the through hole is provided with a plurality of corresponding grooves, which extend in the axial direction and are arranged at intervals in the circumferential direction.

10. A motor, characterized in that: It comprises a rotor structure as described in any one of claims 5 to 9.

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