Motor rotor and motor
By setting a specific design rotor pill on the permanent magnet motor rotor, the combination and elasticity of the raised bumps are used to solve the problem of NVH and motion imbalances caused by magnetic steel in the iron core. In the case of motor performance, the magnetic steel is effectively fixed, which improves the efficiency of the motor and the flexibility of assembly.
Patent Information
- Application Number
- CN202411541414.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-31
- Publication Date
- 2025-01-24
AI Technical Summary
When the rotor magnet of permanent magnet motor is running at medium and high speed variable speed, there may be NVH problems and deterioration of dynamic imbalance caused by the sway of the magnetic steel in the iron core magnetic steel trough. The existing fixing methods have high cost and solid impurities introduced. , production time and problems affecting the back electromotive force and torque performance of the motor.
By setting up the first rotor and the second rotor punch on the motor rotor, using the second limits and the combination of the fourth limit protruding, the fourth limit elastic force is used to promote the magnetic steel and magnetic steel The inner wall of the steel groove is tightly exposed to fix the magnetic steel.
While not affecting the electromotive force and torque performance of the permanent magnet motor, effectively fixing magnetic steel, improving the efficiency of the motor, and can dynamically adjust the number of second rotor pins based on the elastic force required by fixed magnetic steel, which increases Flexibility of assembly.
Smart Images
Figure CN119362748A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of motors, and in particular to a motor rotor and a motor. Background Art
[0002] The rotor core of the permanent magnet motor is designed with inserted magnets. Since the magnet slots and magnet sizes of the rotor core have dimensional tolerances, there is an uncertain gap between the magnets and the magnet slots after the magnets are inserted into the rotor core. When the rotor of the permanent magnet motor is running at medium and high speeds, there may be NVH problems caused by the shaking of the magnets in the magnet slots of the core and the deterioration of the rotor dynamic imbalance.
[0003] In order to fix the magnetic steel, the magnetic steel of the existing permanent magnet motor is mostly fixed in the rotor by mechanical and non-mechanical methods. The non-mechanical fixing method is mostly fixed by injection molding or gluing, which has the defects of high cost, introduction of solid impurities, and time-consuming production. The mechanical fixing method mostly uses the combination of two punching sheets, the protruding spring sheet of the iron core and the iron core groove in the length direction of the magnetic steel. The fixing position of this spring sheet is on the main path of the motor magnetic circuit, which has a great influence on the direction of the magnetic lines of force, and is easy to cause defects such as reduced back electromotive force and torque of the motor. In addition, for such two punching sheet combinations, under the premise that the rotor core has been molded, if the mechanical fixing method of the magnetic steel is not allowed, it is usually forced to use only one of the iron cores without spring sheets and cooperate with the aforementioned injection molding or gluing fixation. This situation will further reduce the back electromotive force and torque performance of the permanent magnet motor. Summary of the invention
[0004] The purpose of the embodiments of the present invention is to provide a motor rotor and a motor, which can fix the magnetic steel without affecting the back electromotive force and torque performance of the permanent magnet motor, thereby improving the working efficiency of the motor.
[0005] In order to achieve the above object, an embodiment of the present invention provides a motor rotor, comprising:
[0006] A first rotor punching sheet, wherein the first rotor punching sheet is provided with a plurality of groups of first magnetic steel slots uniformly distributed along the center, wherein two first magnetic steel slots of the same group have one ends close to the center close to each other and the other ends away from each other, and a first limiting protrusion and a second limiting protrusion for limiting the magnetic steel are provided in the width direction of the first magnetic steel slot, wherein one side of the first limiting protrusion is provided on a side of the first magnetic steel slot away from another first magnetic steel slot of the same group, and the second limiting protrusion is provided on the other side of the first limiting protrusion, and the height of the second limiting protrusion in the length direction of the first magnetic steel slot is lower than that of the first limiting protrusion;
[0007] A second rotor punching sheet, wherein the second rotor punching sheet is provided with a plurality of groups of second magnetic steel slots evenly distributed along the center, wherein two second magnetic steel slots of the same group have one ends close to the center close to each other and the other ends away from each other, and a third limiting protrusion and a fourth limiting protrusion for limiting the magnetic steel are provided in the width direction of the second magnetic steel slot, one side of the third limiting protrusion is provided on a side of the second magnetic steel slot away from another second magnetic steel slot of the same group, the position of the third limiting protrusion in the second magnetic steel slot is the same as the position of the first limiting protrusion in the first magnetic steel slot, and the fourth limiting protrusion is provided on the other side of the third limiting protrusion, and the height of the fourth limiting protrusion in the length direction of the second magnetic steel slot is higher than that of the third limiting protrusion.
[0008] Optionally, the width of the first limiting protrusion in the width direction of the first magnetic steel slot is greater than or equal to 0.5 mm.
[0009] Optionally, the width of the third limiting protrusion in the width direction of the second magnetic steel slot is greater than or equal to 0.5 mm.
[0010] Optionally, an outwardly inclined surface is provided between the first limiting protrusion and the second limiting protrusion.
[0011] Optionally, an outward-facing inclined surface is provided between the third limiting protrusion and the fourth limiting protrusion.
[0012] Optionally, the width of the second limiting protrusion in the width direction of the first magnetic steel slot is greater than the width of the fourth limiting protrusion in the width direction of the second magnetic steel slot.
[0013] Optionally, the fourth limiting protrusion is in the shape of a cuboid.
[0014] Optionally, the first rotor punching sheet and the second rotor punching sheet are stacked and arranged corresponding to the positions of the first magnetic steel slot and the second magnetic steel slot.
[0015] On the other hand, the present invention further provides a motor, comprising a motor stator and any one of the motor rotors described above.
[0016] Through the above technical scheme, the motor rotor and the motor provided by the present invention fix the magnetic steel by cooperating with the first rotor punching sheet with the second limiting protrusion in the width direction and the second rotor punching sheet with the fourth limiting protrusion in the width direction. Specifically, the elastic force of the fourth limiting protrusion pushes the magnetic steel to be in close contact with the inner wall of the magnetic steel slot, thereby fixing the magnetic steel. The magnetic steel can be fixed without affecting the back electromotive force and torque performance of the permanent magnet motor, thereby improving the working efficiency of the motor; and the number of the second rotor punching sheets can be dynamically adjusted according to the size of the elastic force required to fix the magnetic steel, thereby improving the flexibility of assembly.
[0017] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:
[0019] Figure 1 is a partial schematic diagram of a first rotor punching sheet and a second rotor punching sheet of a motor rotor according to an embodiment of the present invention;
[0020] Figure 2 is a physical schematic diagram of a motor rotor according to an embodiment of the present invention;
[0021] Figure 3 It is an experimental result diagram of the influence of various fixing methods on the torque of the motor (A is a normal punching plate design, not mechanically fixed; B is a traditional mechanical fixing method of a combination of two punching plates in the length direction; C is a traditional mechanical fixing method of only a groove punching plate in the length direction; D is the fixing method of the present invention; E is the fixing method of the present invention with only the first rotor punching plate).
[0022] Description of Reference Numerals
[0023] 1. First magnetic steel groove 2. First limit protrusion
[0024] 3. Second limit protrusion 4. Second magnetic steel groove
[0025] 5. The third limit protrusion 6. The fourth limit protrusion
[0026] 7. Magnetic steel DETAILED DESCRIPTION
[0027] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.
[0028] In the embodiments of the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings or are used to describe the relative positional relationships of components in the vertical, perpendicular or gravity direction.
[0029] 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 suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.
[0030] like Figure 1 FIG. 1 is a partial schematic diagram of a first rotor punching sheet and a second rotor punching sheet of a motor rotor according to an embodiment of the present invention. Figure 1 In the embodiment, the motor rotor may include a first rotor punching and a second rotor punching. The first rotor punching is provided with a plurality of groups of first magnetic steel slots 1 evenly distributed along the center, the two first magnetic steel slots 1 of the same group are close to each other at one end close to the center and away from each other at the other end, and a first limiting protrusion 2 and a second limiting protrusion 3 for limiting the magnetic steel 7 are provided in the width direction of the first magnetic steel slot 1, one side of the first limiting protrusion 2 is provided on the side of the first magnetic steel slot 1 away from another first magnetic steel slot 1 of the same group, and the second limiting protrusion 3 is provided on the other side of the first limiting protrusion 2, and the height of the second limiting protrusion 3 in the length direction of the first magnetic steel slot 1 is lower than that of the first limiting protrusion 2. The second rotor punching sheet is provided with a plurality of groups of second magnetic steel slots 4 evenly distributed along the center, and the two second magnetic steel slots 4 of the same group are close to each other at one end close to the center and away from each other at the other end, and the third limiting protrusion 5 and the fourth limiting protrusion 6 for limiting the magnetic steel 7 are provided in the width direction of the second magnetic steel slot 4, one side of the third limiting protrusion 5 is provided on the side of the second magnetic steel slot 4 away from the other second magnetic steel slot 4 of the same group, and the fourth limiting protrusion 6 is provided on the other side of the third limiting protrusion 5, and the position of the third limiting protrusion 5 in the second magnetic steel slot 4 is the same as the position of the first limiting protrusion 2 in the first magnetic steel slot 1, and the height of the fourth limiting protrusion 6 in the length direction of the second magnetic steel slot 4 is higher than the third limiting protrusion 5. The fourth limiting protrusion 6 can rebound when the magnetic steel 7 is inserted into the magnetic steel slot formed corresponding to the first magnetic steel slot 1 and the second magnetic steel slot 4, thereby pushing the magnetic steel 7 to press the inner surface of the magnetic steel slot, thereby fixing the magnetic steel 7.
[0031] In order to ensure the fixing effect of the first limiting protrusion 2, in one embodiment of the present invention, the width of the first limiting protrusion 2 in the width direction of the first magnetic steel slot 1 is greater than or equal to 0.5 mm.
[0032] Similarly, in order to verify the fixing effect of the third limiting protrusion 5 , in one embodiment of the present invention, the width of the third limiting protrusion 5 in the width direction of the second magnetic steel slot 4 is greater than or equal to 0.5 mm.
[0033] In order to allow a certain redundant space for placing the fourth limiting protrusion 6 when the fourth limiting protrusion 6 is deformed to provide elastic force, in one embodiment of the present invention, an outwardly inclined surface is provided between the first limiting protrusion 2 and the second limiting protrusion 3 .
[0034] In order to allow a certain redundant space for placing the fourth limiting protrusion 6 when the fourth limiting protrusion 6 is deformed to provide elastic force, in one embodiment of the present invention, an outward inclined surface is provided between the third limiting protrusion 5 and the fourth limiting protrusion 6 .
[0035] Furthermore, in order to ensure that there is a certain redundant space for placing the fourth limiting protrusion 6 when the fourth limiting protrusion 6 is deformed to provide elastic force, in one embodiment of the present invention, the width of the second limiting protrusion 3 in the width direction of the first magnetic steel groove 1 is greater than the width of the fourth limiting protrusion 6 in the width direction of the second magnetic steel groove 4.
[0036] In this embodiment, the shape of the fourth limiting protrusion 6 can be any of the shapes known to those skilled in the art. However, considering that a cuboid can provide sufficient elastic support, in a preferred example of the present invention, the shape of the fourth limiting protrusion 6 is a cuboid.
[0037] In order to make the first rotor punching and the second rotor punching combine to fix the magnetic steel 7, in one embodiment of the present invention, the first rotor punching and the second rotor punching are stacked and arranged corresponding to the positions of the first magnetic steel slot 1 and the second magnetic steel slot 4. The number of stacking combinations of the first rotor punching and the second rotor punching can be a variety known to those skilled in the art. Considering that when the elastic force provided by the fourth limiting protrusion 6 is required to be large, a larger number of second rotor punchings can be combined. On the contrary, if a non-mechanical fixing method is combined, such as injection molding or gluing, the elastic force provided by the fourth limiting protrusion 6 does not need to be too large. At this time, it is possible to consider reducing the number of second rotor punchings.
[0038] On the other hand, the present invention further provides a motor, comprising a motor stator and any one of the motor rotors described above.
[0039] Figure 3The following is an experimental result diagram of the effects of various fixing methods on the torque of the motor. Among them, A is a normal punching design without mechanical fixing; B is a fixing method of a combination of two punchings in the length direction of a traditional mechanical fixing; C is a fixing method of a traditional mechanical fixing length direction with only a groove punching; D is the fixing method of the present invention; and E is the fixing method of the present invention with only the first rotor punching. It can be seen that the fixing method of the present invention has almost no reduction in torque.
[0040] Through the above technical scheme, the motor rotor and the motor provided by the present invention fix the magnetic steel by cooperating with the first rotor punching sheet with the second limiting protrusion in the width direction and the second rotor punching sheet with the fourth limiting protrusion in the width direction. Specifically, the elastic force of the fourth limiting protrusion pushes the magnetic steel to be in close contact with the inner wall of the magnetic steel slot, thereby fixing the magnetic steel. The magnetic steel can be fixed without affecting the back electromotive force and torque performance of the permanent magnet motor, thereby improving the working efficiency of the motor; and the number of the second rotor punching sheets can be dynamically adjusted according to the size of the elastic force required to fix the magnetic steel, thereby improving the flexibility of assembly.
[0041] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.
[0042] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.
Claims
1. A motor rotor, characterized in that: The motor rotor comprises: A first rotor punching sheet, wherein the first rotor punching sheet is provided with a plurality of groups of first magnetic steel slots uniformly distributed along the center, wherein two first magnetic steel slots of the same group have one ends close to the center close to each other and the other ends away from each other, and a first limiting protrusion and a second limiting protrusion for limiting the magnetic steel are provided in the width direction of the first magnetic steel slot, wherein one side of the first limiting protrusion is provided on a side of the first magnetic steel slot away from another first magnetic steel slot of the same group, and the second limiting protrusion is provided on the other side of the first limiting protrusion, and the height of the second limiting protrusion in the length direction of the first magnetic steel slot is lower than that of the first limiting protrusion; A second rotor punching sheet, wherein the second rotor punching sheet is provided with a plurality of groups of second magnetic steel slots evenly distributed along the center, wherein two second magnetic steel slots of the same group have one ends close to the center close to each other and the other ends away from each other, and a third limiting protrusion and a fourth limiting protrusion for limiting the magnetic steel are provided in the width direction of the second magnetic steel slot, one side of the third limiting protrusion is provided on a side of the second magnetic steel slot away from another second magnetic steel slot of the same group, and the fourth limiting protrusion is provided on the other side of the third limiting protrusion, the position of the third limiting protrusion in the second magnetic steel slot is the same as the position of the first limiting protrusion in the first magnetic steel slot, and the height of the fourth limiting protrusion in the length direction of the second magnetic steel slot is higher than that of the third limiting protrusion.
2. The motor rotor according to claim 1, characterized in that: The width of the first limiting protrusion in the width direction of the first magnetic steel slot is greater than or equal to 0.5 mm.
3. The motor rotor according to claim 1, characterized in that: The width of the third limiting protrusion in the width direction of the second magnetic steel slot is greater than or equal to 0.5 mm.
4. The motor rotor according to claim 1, characterized in that: An outwardly inclined surface is arranged between the first limiting protrusion and the second limiting protrusion.
5. The motor rotor according to claim 1, characterized in that: An outwardly inclined surface is arranged between the third limiting protrusion and the fourth limiting protrusion.
6. The motor rotor according to claim 1, characterized in that: The width of the second limiting protrusion in the width direction of the first magnetic steel slot is greater than the width of the fourth limiting protrusion in the width direction of the second magnetic steel slot.
7. The motor rotor according to claim 1, characterized in that: The fourth limiting protrusion is in the shape of a cuboid.
8. The motor rotor according to claim 1, characterized in that: The first rotor punching sheet and the second rotor punching sheet are stacked and arranged correspondingly according to the positions of the first magnetic steel slot and the second magnetic steel slot.
9. A motor, characterized in that: The motor comprises a motor stator and a motor rotor as claimed in any one of claims 1 to 8.