Rotor punching sheet of motor and motor

Abstract

The utility model provides a rotor punching sheet of a motor and the motor, a punching sheet body is provided with a plurality of magnetic slot units, and the plurality of magnetic slot units are arranged at intervals along the circumferential direction of the punching sheet body; each magnetic slot unit comprises a first magnetic slot group and a second magnetic slot group which are arranged at intervals in the radial direction of the punching sheet body, and each first magnetic slot group comprises a first magnetic slot and a second magnetic slot which are symmetrical in the radial direction; the second magnetic slot group comprises a third magnetic slot and a fourth magnetic slot which are radially symmetrical; the outer edge of the punching sheet body is provided with a plurality of grooves, the plurality of grooves are arranged at intervals along the circumferential direction of the punching sheet body, and the first magnetic groove group, the second magnetic groove group and the grooves are arranged at intervals along the radial direction of the punching sheet body. According to the rotor punching sheet, the magnetic flux path can be optimized, the magnetic flux density can be improved, the effective utilization rate of the magnetic performance of the magnets arranged in the magnetic grooves can be further improved, and the performance of a motor is improved.

Description

Technical Field

[0001] This application relates to the technical field of motor equipment, and particularly to a rotor punching sheet of a motor and a motor. Background Art

[0002] A permanent magnet synchronous motor is a synchronous motor that uses permanent magnets to generate a magnetic field and can be used as a power output device for new energy electric vehicles. Permanent magnets are embedded in the magnetic slots of the rotor punching sheet of the permanent magnet synchronous motor, which enables it to maintain a constant rotational speed during operation and synchronize with the power supply frequency.

[0003] However, the magnetic field utilization rate of the magnets in the permanent magnet synchronous motor in the above related technology is relatively low, and the energy conversion efficiency is relatively low, which affects the performance of the motor. Summary of the Utility Model

[0004] Embodiments of this application provide a rotor punching sheet of a motor and a motor, which are used to solve the technical problem that the magnetic field utilization rate of the magnets in the permanent magnet synchronous motor in the above related technology is relatively low, the energy conversion efficiency is relatively low, and the performance of the motor is affected.

[0005] To achieve the above object, embodiments of this application provide the following technical solutions:

[0006] The first aspect of the embodiments of this application provides a rotor punching sheet of a motor, which includes:

[0007] A punching sheet body, on which a plurality of magnetic slot units are provided, and the plurality of magnetic slot units are arranged at intervals along the circumferential direction of the punching sheet body;

[0008] The magnetic slot unit includes a first magnetic slot group and a second magnetic slot group arranged at intervals along the radial direction of the punching sheet body, and the first magnetic slot group includes a first magnetic slot and a second magnetic slot that are radially symmetric;

[0009] The second magnetic slot group includes a third magnetic slot and a fourth magnetic slot that are radially symmetric;

[0010] The symmetry axes between the first magnetic slot and the second magnetic slot and the symmetry axes between the third magnetic slot and the fourth magnetic slot are collinearly arranged;

[0011] The outer edge of the punching sheet body has a plurality of grooves, and the plurality of grooves are arranged at intervals along the circumferential direction of the punching sheet body, and the first magnetic slot group, the second magnetic slot group, and the grooves are arranged at intervals along the radial direction of the punching sheet body.

[0012] Based on the above technical solutions, this application can also be improved as follows.

[0013] In a possible implementation manner, the ratio of the area of the magnetic slot unit to the surface area of the punching sheet body is greater than or equal to 0.15 and less than or equal to 0.35.

[0014] In a possible implementation, the included angle between the first magnetic slot and the second magnetic slot is a first obtuse angle; the angle of the first obtuse angle is greater than or equal to 92° and less than or equal to 110°.

[0015] In a possible implementation, the included angle between the third magnetic slot and the fourth magnetic slot is a second obtuse angle; the angle of the second obtuse angle is greater than or equal to 92° and less than or equal to 110°;

[0016] The length of the first magnetic slot is greater than the length of the third magnetic slot.

[0017] In a possible implementation, in the circumferential direction of the punching sheet body, the groove is located between the first magnetic slot and the second magnetic slot.

[0018] In a possible implementation, the groove is an arc-shaped groove, and the central angle corresponding to the arc edge of the arc-shaped groove is less than or equal to 180°.

[0019] In a possible implementation, a through hole for the rotation shaft to pass through is provided at the center of the punching sheet body;

[0020] The inner edge of the through hole has two oppositely arranged limiting protrusions, and the two limiting protrusions are used for mating with the limiting grooves on the rotation shaft;

[0021] The central symmetry line of the two limiting protrusions intersects with the symmetry axis of the first magnetic slot and the second magnetic slot and has a first included angle.

[0022] In a possible implementation, the angle of the first included angle is greater than or equal to 0° and less than or equal to 2.5°.

[0023] The second aspect of the embodiments of the present application provides a motor, which includes a rotation shaft and a plurality of rotor punching sheets of the motor as described above, and the rotation shaft penetrates through the rotor punching sheets;

[0024] Some of the rotor punching sheets are stacked axially forward along the rotation shaft to form a first iron core, and some of the other rotor punching sheets are stacked axially backward along the rotation shaft to form a second iron core;

[0025] The magnetic slot units of the rotor punching sheets in the first iron core and the magnetic slot units of the rotor punching sheets in the second iron core are staggered from each other in the circumferential direction of the rotation shaft by a second included angle.

[0026] In a possible implementation, the angle of the second included angle is greater than or equal to 0° and less than or equal to 2.5°.

[0027] An embodiment of the present application provides a rotor punching sheet of a motor and a motor. By arranging a plurality of magnet groove units for accommodating magnets on the punching sheet body, the first magnet groove group and the second magnet groove group punched by the magnet groove units are arranged at intervals in the radial direction, the first magnet groove and the second magnet groove in the first magnet groove group in the magnet groove unit are arranged radially symmetrically, and the third magnet groove and the fourth magnet groove in the second magnet groove group in the magnet groove unit are arranged radially symmetrically. The symmetry axes between the first magnet groove and the second magnet groove and the symmetry axes between the third magnet groove and the fourth magnet groove are collinearly arranged, so that the magnetic flux path can be optimized and the magnetic flux density can be increased. Furthermore, the effective utilization rate of the magnetic properties of the magnets arranged in each magnet groove can be improved, and the performance of the motor can be improved.

[0028] Furthermore, by arranging a plurality of grooves on the outer edge of the punching sheet body, the distribution of the magnetic flux can be changed, the cogging effect can be reduced, and thus the amplitude of the harmonics can be reduced. The design of the grooves can also make the distribution of the magnetic flux in the air gap more uniform, reduce the generation of high-order harmonics, thereby reducing the amplitude of the harmonics in the air gap magnetic field, contributing to improving the running smoothness of the motor, reducing vibration and noise, and further improving the performance of the motor. Description of the Drawings

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0030] Figure 1 It is a schematic structural diagram of a rotor punching sheet of a motor provided by an embodiment of the present application;

[0031] Figure 2 is Figure 1 a partial structural diagram of the M position of the rotor punching sheet in;

[0032] Figure 3 It is a schematic structural diagram of an iron core of a motor provided by an embodiment of the present application.

[0033] Description of the Reference Numerals:

[0034] 10 - Rotor punching sheet; 20 - First iron core; 30 - Second iron core;

[0035] 100 - Punching sheet body;

[0036] 110 - Magnet groove unit; 120 - Groove; 130 - Through hole; 140 - Limit protrusion;

[0037] 111 - First magnet groove group; 112 - Second magnet groove group;

[0038] 1111 - First magnetic slot; 1112 - Second magnetic slot; 1121 - Third magnetic slot;

[0039] 1122 - Fourth magnetic slot. Detailed implementation manner

[0040] As described in the background art, in the prior art, the magnetic field utilization rate of the magnets in the permanent magnet synchronous motor is relatively low, and the energy conversion efficiency is relatively low, which affects the performance of the motor. The reason for this problem is that the topological structure of the magnetic slots on the rotor punching sheet for installing magnets in the motors in the prior art is mostly in the form of a single "V" or "V + one", resulting in a low magnetic field utilization rate of the permanent magnets and a low energy conversion efficiency.

[0041] In view of the above technical problems, the embodiments of the present application provide a rotor punching sheet and a motor of a motor. By arranging a plurality of magnetic slot units for accommodating magnets on the punching sheet body of the rotor punching sheet, the first magnetic slot group and the second magnetic slot group in the magnetic slot units are arranged at intervals in the radial direction, and the first magnetic slot and the second magnetic slot in the first magnetic slot group in the magnetic slot unit are symmetrically arranged radially to form a "V"-shaped first magnetic slot group, and the third magnetic slot and the fourth magnetic slot in the second magnetic slot group in the magnetic slot unit are symmetrically arranged radially to form another "V"-shaped second magnetic slot group. The symmetry axes between the first magnetic slot and the second magnetic slot and the symmetry axes between the third magnetic slot and the fourth magnetic slot are collinearly arranged. By setting the magnetic slot unit as two "V"-shaped magnetic slot groups, the magnetic flux path can be optimized and the magnetic flux density can be increased, and further, the effective utilization rate of the magnetic properties of the magnets arranged in each magnetic slot can be improved, and the performance of the motor can be improved.

[0042] Furthermore, by arranging a plurality of grooves on the outer edge of the punching sheet body, the distribution of the magnetic flux can be changed, the cogging effect can be reduced, and thus the amplitude of the harmonics can be reduced. The design of the grooves can also make the distribution of the magnetic flux in the air gap more uniform, reduce the generation of high-order harmonics, and thus reduce the amplitude of the harmonics in the air gap magnetic field, which helps to improve the running smoothness of the motor, reduce vibration and noise, and further improve the performance of the motor.

[0043] In order to make the above objects, features, and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the protection scope of the present application.

[0044] Refer to Figure 1, an embodiment of the present application provides a rotor punching sheet 10 of a motor. The rotor punching sheet 10 may include a punching sheet body 100, and the contour of the outer edge of the punching sheet body 100 may be approximately circular. A plurality of magnetic slot units 110 are formed on the punching sheet body 100, and the plurality of magnetic slot units 110 are arranged at intervals along the circumferential direction of the punching sheet body 100 to facilitate arranging magnets in the magnetic slot units 110. The plurality of magnetic slot units 110 can be arranged at intervals and evenly along the circumferential direction of the punching sheet body 100. For example, eight magnetic slot units 110 arranged at intervals and evenly can be formed on the punching sheet body 100.

[0045] Reference Figure 1 , each magnetic slot unit 110 may include a first magnetic slot group 111 and a second magnetic slot group 112 arranged at intervals in the radial direction of the punching sheet body 100.

[0046] The first magnetic slot group 111 may include a first magnetic slot 1111 and a second magnetic slot 1112 that are radially symmetric. One end of the first magnetic slot 1111 close to the center of the circle of the punching sheet body 100 in the extending direction is close to one end of the second magnetic slot 1112 close to the center of the circle of the punching sheet body 100 in the rectangular extending direction, and the other end of the first magnetic slot 1111 in the extending direction is far from the other end of the second magnetic slot 1112 in the extending direction, so that the first magnetic slot 1111 and the second magnetic slot 1112 form an approximately "V"-shaped first magnetic slot group 111.

[0047] The second magnetic slot group 112 may include a third magnetic slot 1121 and a fourth magnetic slot 1122 that are radially symmetric. One end of the third magnetic slot 1121 close to the center of the circle of the punching sheet body 100 in the extending direction is close to one end of the fourth magnetic slot 1122 close to the center of the circle of the punching sheet body 100 in the rectangular extending direction, and the other end of the third magnetic slot 1121 in the extending direction is far from the other end of the fourth magnetic slot 1122 in the extending direction, so that the third magnetic slot 1121 and the fourth magnetic slot 1122 also form an approximately "V"-shaped second magnetic slot group 112.

[0048] In this way, by setting the magnetic slot unit 110 as two "V"-shaped magnetic slot groups, the magnetic flux path can be optimized and the magnetic flux density can be increased, and further the effective utilization rate of the magnets arranged in each magnetic slot can be improved, and the performance of the motor can be improved.

[0049] The symmetry axes between the first magnetic slot 1111 and the second magnetic slot 1112 and the symmetry axes between the third magnetic slot 1121 and the fourth magnetic slot 1122 are collinearly arranged.

[0050] Reference Figure 1 and Figure 2, the outer edge of the punching sheet body 100 has a plurality of grooves 120. The plurality of grooves 120 are arranged at intervals along the circumferential direction of the punching sheet body 100. The first magnetic groove group 111, the second magnetic groove group 112 and the grooves 120 are arranged at intervals along the radial direction of the punching sheet body 100.

[0051] In this way, by arranging a plurality of grooves 120 on the outer edge of the punching sheet body 100, the distribution of magnetic flux can be changed, the cogging effect can be reduced, and thus the amplitude of harmonics can be reduced. The design of the grooves 120 can also make the distribution of magnetic flux in the air gap more uniform, reduce the generation of higher-order harmonics, thereby reducing the harmonic amplitude in the air-gap magnetic field, helping to improve the running smoothness of the motor, reduce vibration and noise, and further improve the performance of the motor.

[0052] On the outer edge of the punching sheet body 100, the more the number of grooves 120, the more beneficial it is to reduce the cogging effect and the more helpful it is to reduce the harmonic amplitude.

[0053] Reference Figure 1 , in some embodiments, the ratio of the area of the magnetic groove unit 110 to the surface area of the punching sheet body 100 is greater than or equal to 0.15 and less than or equal to 0.35.

[0054] In some embodiments, the ratio of the area of the magnetic groove unit 110 to the surface area of the punching sheet body 100 can be one of 0.16, 0.2, 0.25 and 0.32, and the ratio of the area of the magnetic groove unit 110 to the surface area of the punching sheet body 100 can be any point value greater than or equal to 0.15 and less than or equal to 0.35.

[0055] In this way, if the ratio of the area of the magnetic groove unit 110 to the surface area of the punching sheet body 100 is too small, it will cause an increase in the effective area of the iron core formed after the rotor punching sheets 10 are laminated, resulting in too high magnetic flux density, leading to magnetic saturation and affecting the performance of the motor. If the magnetic groove unit 110 is too small, it will cause the inability to effectively interrupt the eddy current path, resulting in an increase in eddy current loss.

[0056] If the ratio of the area of the magnetic groove unit 110 to the surface area of the punching sheet body 100 is too large, it will weaken the mechanical strength of the rotor, increasing the risk of fracture or deformation of the punching sheet body 100. An overly large magnetic groove unit 110 will reduce the effective area of the iron core formed after the rotor punching sheets 10 are laminated, thereby reducing the magnetic flux density, affecting the magnetic performance of the motor and resulting in a decrease in efficiency. An overly large magnetic groove unit 110 will also cause the magnetic flux path to be discontinuous and result in an increase in eddy current loss.

[0057] Reference Figure 1 , in some embodiments, the included angle between the first magnetic groove 1111 and the second magnetic groove 1112 is a first obtuse angle (as shown by the angle A in Figure 1 ). The angle of the first obtuse angle A is greater than or equal to 92° and less than or equal to 110°.

[0058] In some embodiments, the angle of the first obtuse angle A can be one of 95°, 100°, and 106°, and the angle of the first obtuse angle can be any point value within the range greater than 92° and less than or equal to 110°.

[0059] If the angle of the first obtuse angle A is too small, it will cause the magnets installed in the first magnetic slot 1111 and the magnets installed in the second magnetic slot 1112 to be too close to each other. With the magnetic flux unchanged, the density of the magnetic field lines between the two magnets will increase, resulting in an increase in heat loss during the conversion of electrical energy into mechanical energy and reducing the conversion efficiency of the motor.

[0060] If the angle of the first obtuse angle A is too large, it will cause interference between adjacent two first magnetic slot groups 111, resulting in the cancellation of the magnetic properties of the magnets in the two first magnetic slot groups 111 and reducing the output torque of the motor.

[0061] Reference Figure 1 , in some embodiments, the included angle between the third magnetic slot 1121 and the fourth magnetic slot 1122 is the second obtuse angle (as shown by angle B in Figure 1 ). The angle of the second obtuse angle B is greater than or equal to 92° and less than or equal to 110°.

[0062] In some embodiments, the angle of the second obtuse angle B can be one of 95°, 100°, and 106°, and the angle of the second obtuse angle B can be any point value within the range greater than 92° and less than or equal to 110°. In some embodiments, the angle of the first obtuse angle A and the angle of the second obtuse angle B can be the same.

[0063] If the angle of the second obtuse angle B is too small, it will cause the magnets installed in the third magnetic slot 1121 and the magnets installed in the fourth magnetic slot 1122 to be too close to each other. With the magnetic flux unchanged, the density of the magnetic field lines between the two magnets will increase, resulting in an increase in heat loss during the conversion of electrical energy into mechanical energy and reducing the conversion efficiency of the motor.

[0064] If the angle of the second obtuse angle B is too large, it will cause interference between the second magnetic slot groups 112 in adjacent two magnetic slot units 110, resulting in the cancellation of the magnetic properties of the magnets in the two second magnetic slot groups 112 and reducing the output torque of the motor.

[0065] In some embodiments, the length of the first magnetic slot 1111 is greater than the length of the third magnetic slot 1121, and the width of the first magnetic slot 1111 is also greater than the width of the third magnetic slot 1121.

[0066] Reference Figure 1, in the circumferential direction of the punching sheet body 100, the groove 120 can be located between the third magnetic groove 1121 and the fourth magnetic groove 1122. Alternatively, in the circumferential direction of the punching sheet body 100, the groove 120 can also be located between the first magnetic groove 1111 and the second magnetic groove 1112.

[0067] In a specific implementation, in the circumferential direction of the punching sheet body 100, the groove 120 is located between the first magnetic groove 1111 and the second magnetic groove 1112. In this way, when the groove 120 is arranged between the first magnetic groove 1111 and the second magnetic groove 1112, compared with the area where the groove 120 is arranged between the first magnetic groove 1111 and the third magnetic groove 1121, the effect of reducing the cogging effect is better, which is more helpful for reducing the amplitude of harmonics.

[0068] In some examples, between the first magnetic groove 1111 and the second magnetic groove 1112, a plurality of grooves 120 can also be arranged. For example, two grooves 120 can be arranged between the first magnetic groove 1111 and the second magnetic groove 1112.

[0069] Reference Figure 1 and Figure 2 , in some embodiments, the groove 120 is an arc-shaped groove, and the central angle (such as the angle E shown in Figure 2 ) corresponding to the arc edge of the arc-shaped groove is less than or equal to 180°.

[0070] In this way, by setting the groove 120 as an arc shape, it is convenient for the processing of the groove 120, reduces the processing difficulty of the rotor punching sheet 10, improves the production efficiency of the rotor punching sheet 10, and can improve the production efficiency of the motor.

[0071] For example, the central angle corresponding to the arc edge of the arc-shaped groove can be one of 160°, 120°, 100°, and 90°. Alternatively, the angle of the central angle corresponding to the arc edge of the arc-shaped groove can be any point value within the range less than or equal to 180° and greater than 0°. In this way, it is possible to avoid removing too much of the structure of the punching sheet body 100 due to the opening of the groove 120, and improve the structural strength of the punching sheet body 100.

[0072] Reference Figure 1 , in some embodiments, a through hole 130 for the rotation shaft to pass through is provided at the center of the punching sheet body 100. The inner edge of the through hole 130 has two oppositely arranged limiting protrusions 140, and the two limiting protrusions 140 are used to match with the limiting grooves on the rotation shaft. The central symmetry line of the two limiting protrusions 140 intersects with the symmetry axis of the first magnetic groove 1111 and the second magnetic groove 1112 and has a first included angle (such as the included angle C shown in Figure 1 ).

[0073] In this way, by providing two limiting protrusions 140 and adapting the two limiting protrusions 140 to the limiting grooves on the rotating shaft, the rotating shaft can be limited in the circumferential direction, the torque between the rotating shaft and the punching sheet body 100 can be increased, and relative sliding between the rotating shaft and the rotor punching sheet 10 can be avoided.

[0074] The limiting protrusion 140 can also play a positioning role, facilitating the sleeving of the rotor punching sheet 10 on the rotating shaft, so as to improve the assembly efficiency of the rotor punching sheet 10 and the rotating shaft.

[0075] Furthermore, when there are two iron cores in the motor, and both of the two iron cores are formed by stacking the above-mentioned multiple punching sheet bodies 100 in opposite stacking manners. By making the central symmetry line of the two limiting protrusions 140 intersect with the symmetry axis of the first magnetic groove 1111 and the second magnetic groove 1112 to form a first included angle C, it is possible to make the symmetry axis between the first magnetic groove 1111 and the second magnetic groove 1112 of the punching sheet body 100 in one iron core deflect by an angle of the first included angle C with respect to the symmetry axis between the first magnetic groove 1111 and the second magnetic groove 1112 of the punching sheet body 100 in the other iron core. This setting method can effectively reduce the magnetic groove torque, further reduce the vibration of the motor, and improve the smoothness during the operation of the motor.

[0076] Reference Figure 1 , in some embodiments, the angle of the first included angle C is greater than or equal to 0° and less than or equal to 2.5°. For example, the angle of the first included angle C can be one of 1°, 1.5°, and 2°. Or, the angle of the first included angle C can be any point value within the range of greater than or equal to 0° and less than or equal to 2.5°.

[0077] Reference Figure 1 and Figure 3 , the embodiment of the present application further provides a motor, which may include a rotating shaft and multiple rotor punching sheets 10 of the above motor, and the rotating shaft penetrates through the rotor punching sheets 10.

[0078] Among them, a part of the rotor punching sheets 10 are stacked axially forward along the rotating shaft as the first iron core 20, and another part of the rotor punching sheets 10 are stacked axially backward along the rotating shaft as the second iron core 30. The magnetic groove units 110 of the rotor punching sheets 10 in the first iron core 20 are staggered from each other in the circumferential direction of the rotating shaft by a second included angle (such as the included angle D shown in Figure 3 ).

[0079] In this way, by using the above-mentioned rotor punching sheets 10, the magnetic flux path can be optimized and the magnetic flux density can be increased, thereby enabling the effective utilization rate of the magnets arranged in each magnetic groove to be improved, the performance of the motor to be improved, and it is helpful to improve the smoothness of the operation of the motor, reduce vibration and noise, and further improve the performance of the motor.

[0080] Furthermore, by staggering the magnetic slot units 110 of the rotor laminations 10 in the first iron core 20 from the magnetic slot units 110 of the rotor laminations 10 in the second iron core 30 by a second included angle D in the circumferential direction of the rotating shaft, the magnetic slot torque can be effectively reduced, the vibration of the motor can be further reduced, and the smoothness during the operation of the motor can be improved.

[0081] Reference Figure 3 , in some embodiments, the angle of the second included angle D is greater than or equal to 0° and less than or equal to 2.5°. For example, the angle of the second included angle D can be one of 1°, 1.75°, and 2.3°. Alternatively, the angle of the first included angle C can be any point value within the range of greater than or equal to 0° and less than or equal to 2.5°.

[0082] In this specification, the various embodiments or implementation manners are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other.

[0083] It should be noted that phrases such as "in specific implementation", "in some embodiments", "in this embodiment", and "exemplarily" mentioned in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not necessarily every embodiment includes such specific features, structures, or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. Furthermore, when combining a specific feature, structure, or characteristic with an embodiment, implementing such a feature, structure, or characteristic in combination with other embodiments, whether explicitly or implicitly described, is within the knowledge scope of those skilled in the art.

[0084] Generally speaking, terms should be understood at least in part by their use in the context. For example, at least in part according to the context, the term "one or more" used in the text can be used to describe any feature, structure, or characteristic in the sense of a singular, or can be used to describe a combination of features, structures, or characteristics in the sense of a plural. Similarly, at least in part according to the context, terms such as "a" or "the" can also be understood to convey a singular usage or a plural usage.

[0085] It should be easily understood that the terms "on...", "above...", and "over..." in this disclosure should be interpreted in the broadest manner, so that "on..." not only means "directly on something", but also includes the meaning of "on something" with intermediate features or layers therebetween, and "above..." or "over..." not only includes the meaning of "above or over something", but also can include the meaning of "above or over something" without intermediate features or layers therebetween (i.e., directly on something).

[0086] In addition, for ease of description, the text may use spatial relative terms, such as "below", "beneath", "under", "above", "over", etc., to describe the relationship of one element or feature to other elements or features as shown in the figures. Spatial relative terms are intended to encompass different orientations of the device in use or operation other than the orientation shown in the drawings. The device may have other orientations (rotated 90 degrees or at other orientations), and the spatial relative descriptors used in the text may be interpreted accordingly as well.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A rotor punching sheet of a motor, characterized in that: include: A punching sheet body, wherein a plurality of magnetic slot units are provided on the punching sheet body, and the plurality of magnetic slot units are arranged at intervals along the circumference of the punching sheet body; The magnetic slot unit comprises a first magnetic slot group and a second magnetic slot group which are arranged radially and spaced apart from each other along the punching sheet body, wherein the first magnetic slot group comprises a first magnetic slot and a second magnetic slot which are radially symmetrical; The second magnetic groove group includes a third magnetic groove and a fourth magnetic groove which are radially symmetrical; The symmetry axis between the first magnetic groove and the second magnetic groove and the symmetry axis between the third magnetic groove and the fourth magnetic groove are arranged collinearly; The outer edge of the punch body has a plurality of grooves, and the plurality of grooves are arranged at intervals along the circumference of the punch body. The first magnetic groove group, the second magnetic groove group and the grooves are arranged at intervals along the radial direction of the punch body.

2. The rotor punching sheet of the motor according to claim 1, characterized in that: The ratio of the area of ​​the magnetic slot unit to the surface area of ​​the punch body is greater than or equal to 0.15 and less than or equal to 0.

35.

3. The rotor punching sheet of the motor according to claim 1, characterized in that: The angle between the first magnetic groove and the second magnetic groove is a first obtuse angle; The angle of the first obtuse angle is greater than or equal to 92° and less than or equal to 110°.

4. The rotor punching sheet of the motor according to claim 1, characterized in that: The included angle between the third magnetic groove and the fourth magnetic groove is a second obtuse angle; The angle of the second obtuse angle is greater than or equal to 92° and less than or equal to 110°; The length of the first magnetic groove is greater than the length of the third magnetic groove.

5. The rotor punching sheet of the motor according to claim 1, characterized in that: In the circumferential direction of the punch body, the groove is located between the first magnetic groove and the second magnetic groove.

6. The rotor punching sheet of the motor according to claim 1, characterized in that: The groove is an arc-shaped groove, and the central angle corresponding to the arc-shaped edge of the arc-shaped groove is less than or equal to 180°.

7. The rotor punching of the motor according to any one of claims 1 to 6, characterized in that: A through hole is provided at the center of the punch body for the shaft to pass through; The inner edge of the through hole has two oppositely arranged limiting protrusions, and the two limiting protrusions are used to match the limiting grooves on the rotating shaft; The central symmetry lines of the two limiting protrusions intersect with the symmetry axes of the first magnetic groove and the second magnetic groove and have a first angle.

8. The rotor punching sheet of the motor according to claim 7, characterized in that: The first angle is greater than or equal to 0° and less than or equal to 2.5°.

9. A motor, characterized in that: A motor comprising a rotating shaft and a plurality of rotor punchings of the motor according to any one of claims 1 to 8, wherein the rotating shaft passes through the rotor punchings; A portion of the rotor punchings are stacked in the positive axial direction of the rotating shaft as a first iron core, and another portion of the rotor punchings are stacked in the negative axial direction of the rotating shaft as a second iron core; The magnetic slot units of the rotor punching sheets in the first core and the magnetic slot units of the rotor punching sheets in the second core are staggered at a second angle in the circumferential direction of the rotating shaft.

10. The motor according to claim 9, characterized in that The second angle is greater than or equal to 0° and less than or equal to 2.5°.

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