Permanent magnet motor rotor and permanent magnet motor
By setting up a pigeon tail slot on the outer surface of the inner cylinder of the permanent magnet motor and embedded an elastic balance weight block, the problem of inconsistent rotor quality of large permanent magnet motors is solved, the uniformity of rotor quality and motor stability are achieved, and the cost and Operational complexity.
Patent Information
- Application Number
- CN202420786056.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-16
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2034-04-16
AI Technical Summary
The inconsistent mass of the rotor of existing large permanent magnet motors leads to abnormal sound and vibration of rotation. Existing solutions such as weight reduction and weight gain have complex operation or high cost problems, making it difficult to effectively balance the rotor mass.
Design a permanent magnet motor rotor including an inner cylinder, a fan punching plate, an end plate and an elastic balance weight block. By setting a pigeon tail groove on the outer surface of the inner cylinder, and embedded an elastic balance between the pigeon tail groove and the end plate. Heavy blocks, mass balance is performed according to the initial mass distribution.
The uniformity of mass in all parts of the rotor is achieved, the stability and service life of the motor are ensured, the generation of iron filings and operation complexity are avoided, and the cost is reduced.
Smart Images
Figure CN222169432U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of motor manufacturing, in particular to a permanent magnet motor rotor. Background Art
[0002] As the power and volume of permanent magnet motors continue to increase, when the rotor outer diameter is above 1000mm, a complete rotor will be formed by lamination. The existing rotor manufacturing and processing technology is relatively mature, but there are still certain defects in actual use.
[0003] For example, the rotor of the existing large permanent magnet motor is composed of multiple stacked sheets, and there are often certain errors in the processing and manufacturing of the sheets, resulting in inconsistent quality of the rotor. When the errors accumulate to a certain amount, the rotation of the rotor will have abnormal noise, vibration and other undesirable conditions, which will greatly affect the life of the motor. There are two existing solutions. One is the weight reduction method, that is, using grinding equipment to grind the heavier part of the rotor to make the weight of the rotor equal. However, this method will produce a large amount of iron filings, which will adhere to the rotor and are difficult to clean, and there are certain safety hazards. The other is the weight increase method, that is, a balance plate is configured at the lighter part, and screws are added to the balance plate to make the weight of the rotor equal. This method is complicated to operate and has a high cost.
[0004] Therefore, providing a rotor of a large permanent magnet motor that performs mass balance according to the initial mass distribution of the rotor is a technical problem that needs to be solved urgently in the art. Utility Model Content
[0005] In order to solve at least one of the above technical problems, the utility model provides a permanent magnet motor rotor.
[0006] The utility model is implemented as follows: a permanent magnet motor rotor comprises an inner cylinder, a sector punching sheet, an end plate and an elastic balancing weight; the inner cylinder comprises a dove tail groove arranged in a circular array on its outer surface; the sector punching sheet is located on the outer side of the inner cylinder; the end plate is located at both ends of the sector punching sheet after stamping and is used to limit the axial direction of the inner cylinder to the sector punching sheet; the elastic balancing weight is embedded between the dove tail groove and the end plate and is used to balance the rotor mass.
[0007] Optionally, the dove tail groove runs through the inner tube along the length direction of the inner tube.
[0008] Optionally, the fan-shaped punching piece is provided with a dove tail matching with the dove tail groove.
[0009] Optionally, a magnetic steel groove for installing a magnetic steel is provided on the sector-shaped punching piece.
[0010] Optionally, the elastic balancing weight has the same shape as the cross-section of the dovetail groove.
[0011] Optionally, the mass of the elastic balancing weight is 0.2g-10g.
[0012] Optionally, a limiting slot for limiting the position of the elastic balancing weight block is provided on the end plate.
[0013] Optionally, the width of the limit slot is smaller than the thickness of the elastic balancing weight.
[0014] Optionally, a counterweight block clip strip matching with the limit clip slot is provided on the top of the elastic balancing counterweight block.
[0015] On the other hand, a permanent magnet motor includes a stator, a rotor, a casing and an end cover; the rotor is the permanent magnet motor rotor mentioned above, the stator is located outside the rotor; the casing is located outside the stator; and the end cover is located at both ends of the stator and the rotor.
[0016] The beneficial technical effect of implementing the utility model is as follows: since the utility model is provided with a dove tail groove on the inner cylinder, and an elastic balancing weight is provided between the dove tail groove and the end plate in an embedded manner, the mass of the rotor can be balanced according to the initial mass distribution of various parts of the rotor after assembly, so that the mass of each part of the rotor is equal, thereby ensuring the stability of the rotor during use and extending the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 This is a schematic diagram of the installation of the utility model;
[0018] Figure 2 It is a full cross-sectional view of the utility model;
[0019] Figure 3 for Figure 2 A partial enlarged view of the middle part;
[0020] Figure 4 It is a schematic diagram of the end plate of the utility model;
[0021] Figure 5 It is a schematic diagram of the fan-shaped punching sheet of the utility model;
[0022] Figure 6 It is a schematic diagram of the elastic balancing weight of the utility model. DETAILED DESCRIPTION
[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0024] It should be noted that if the embodiments of the present utility model involve directional indications, such as up, down, left, right, front, back, etc., then the directional indication is 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. In addition, if the embodiments of the present utility model involve descriptions such as "first, second", "S1, S2", "step one, step two", etc., then such descriptions are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features or indicating the execution order of the method, etc. Those skilled in the art can understand that everything that does not violate the key points of the utility model under the technical concept of the utility model should be included in the protection scope of the utility model.
[0025] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.
[0026] like Figure 1-Figure 6 As shown, the utility model provides a permanent magnet motor rotor, including an inner cylinder 1, a sector punching sheet 2, an end plate 3 and an elastic balancing weight 4; the inner cylinder 1 includes a dovetail groove 101 arranged in a circular array on its outer surface; the sector punching sheet 2 is located on the outside of the inner cylinder 1; the end plate 3 is located at both ends of the sector punching sheet 2 after stamping, and is used to limit the axial position of the sector punching sheet 2 in the inner cylinder 1; the elastic balancing weight 4 is embedded between the dovetail groove 101 and the end plate 3, and is used to balance the rotor mass.
[0027] In the example, the inner cylinder 1 is used to carry the sector punching sheet 2; the sector punching sheet 2 is located on the outside of the inner cylinder 1 and is used to form a rotor core; the end plates 3 are located at both ends of the sector punching sheet 2 after stamping and are used to limit the relative position of the sector punching sheet 2 in the axial direction of the inner cylinder 1; the elastic balancing weight block 4 is embedded between the dove tail groove 101 and the end plate 3 and is used to balance the mass of the rotor core after stamping to ensure the service life of the permanent magnet motor.
[0028] When it is necessary to balance the mass of the permanent magnet motor rotor, first install the stamped rotor on the test platform, then start the test platform to make the rotor rotate around itself, and judge whether the mass of each part of the rotor is equal during the rotation. If so, there is no need to install the elastic balancing weight 4; otherwise, test where the mass of the rotor needs to be increased and the value of the increased mass. After determining the position and mass of the elastic balancing weight 4 that needs to be added, it is only necessary to select the elastic balancing weight 4 that meets the quality requirements, and then embed it between the dovetail groove 101 and the end plate 3 at the corresponding position to achieve the balance of the rotor mass.
[0029] It is worth noting that in this embodiment, only the material type, function and installation position of the elastic balancing weight 4 are limited, but its shape, size, etc. are not restricted. In other words, the shape, size, etc. of the elastic balancing weight 4 can be arbitrarily set by technical personnel in this field according to actual conditions.
[0030] The key to the utility model is that a dovetail groove 101 for accommodating an elastic balancing weight 4 is provided on the periphery of the inner tube 1, and the elastic balancing weight 4 is embedded between the dovetail groove 101 and the end plate 3 by utilizing its own elastic properties, so that the mass of the rotor can be balanced at various locations, without the need to process the rotor and add a balancing plate as in the prior art solution, thereby improving the efficiency of rotor balancing.
[0031] like Figure 2 As shown, the dove tail groove 101 penetrates the inner tube 1 along the length direction of the inner tube 1.
[0032] For example, the dove tail groove 101 penetrates the inner tube 1 along the length direction of the inner tube 1, which is beneficial to reserve more installation positions for the installation of the elastic balancing weight 4 and facilitates the installation of the elastic balancing weight 4; secondly, the dove tail groove 101 can also be used to fix the fan-shaped punching piece 2. By providing a structure on the fan-shaped punching piece 2 that matches the dove tail groove 101, the fan-shaped punching piece 2 can be quickly installed and fixed to the outer periphery of the inner tube 1.
[0033] Preferably, Figure 5 As shown, the sector-shaped punching piece 2 is provided with a dove tail 201 that matches the dove tail groove 101 .
[0034] For example, the dove tail 201 is used to cooperate with the dove tail groove 101 on the periphery of the inner tube 1 to achieve rapid installation and fixation of the sector punching piece 2.
[0035] Since magnetic steel needs to be installed on the rotor of the permanent magnet motor, the existing installation method of the magnetic steel is relatively complicated. Therefore, the utility model provides a preferred installation method of the magnetic steel.
[0036] Preferably, Figure 5 As shown, the sector-shaped punching piece 2 is provided with a magnetic steel groove 202 for installing the magnetic steel.
[0037] For example, a magnetic steel groove 202 for installing a magnetic steel is provided on the sector-shaped punching sheet 2, which is conducive to the rapid installation of the magnetic steel. When the magnetic steel needs to be installed, the end plate 3 is first fixed at one end of the inner cylinder 1, and then the sector-shaped punching sheet 2 is stamped and installed on the outer periphery of the inner cylinder 1, and then the magnetic steel is inserted into the magnetic steel groove 202, and finally the end plate on the other side is fixed, so that the magnetic steel can be quickly installed and fixed.
[0038] like Figure 6 As shown, the outer shape of the elastic balancing weight 4 is the same as the cross-sectional shape of the dove tail groove 101 .
[0039] For example, the elastic balancing weight 4 has the same cross-sectional shape as the dovetail slot 101, which helps to better ensure the stability of the elastic balancing weight 4 embedded between the dovetail slot 101 and the end plate 3, and prevent the elastic balancing weight 4 from loosening during rotor operation.
[0040] Since the mass errors at various locations on the rotor are not fixed, elastic balancing weights 4 of various masses are required to meet the needs of rotor mass balance. However, manufacturing elastic balancing weights 4 of various masses will greatly increase production costs and easily lead to waste of resources. For this reason, the utility model proposes a preferred embodiment for the mass range of the elastic balancing weight 4.
[0041] Preferably, the elastic balancing weight 4 has a mass of 0.2 g-10 g.
[0042] For example, after analyzing a large amount of rotor balancing test data, it is found that the mass deviation of the rotor is mainly concentrated between 0.2g and 10g. Therefore, the mass of the elastic balancing weight 4 is set within this range, which can meet the use needs in most cases.
[0043] Since the elastic balancing weight 4 is embedded between the dove tail groove 101 and the end plate 3 due to the characteristics of its elastic material, when the permanent magnet motor shakes in the working state, the elastic balancing weight 4 embedded between the dove tail groove 101 and the end plate 3 may fall off. Therefore, the utility model provides a preferred implementation scheme.
[0044] Preferably, Figure 4 As shown, a limiting slot 301 for limiting the position of the elastic balancing weight 4 is provided on the end plate 3 .
[0045] For example, since the installation position of the elastic balancing weight 4 is between the dove tail groove 101 and the end plate 3, a limiting groove 301 is provided on the end plate 3 for limiting the position of the elastic balancing weight 4, which can effectively prevent the elastic balancing weight 4 from falling off.
[0046] It is worth noting that in this embodiment, only the position and function of the limit slot 301 are limited, but its size, shape, etc. are not limited. That is to say, the size, shape, etc. of the limit slot 301 can be arbitrarily set by technical personnel in this field according to actual conditions.
[0047] More preferably, Figure 4 As shown, the width of the limiting slot 301 is smaller than the thickness of the elastic balancing weight 4 .
[0048] For example, the thickness of the limit slot 301 is less than the thickness of the elastic balancing weight 4, which is beneficial to the production of the elastic balancing weight 4. That is, it is only necessary to ensure that there is a structure above the elastic balancing weight 4 that can be embedded in the limit slot 301, so as to further limit the position of the elastic balancing weight 4.
[0049] like Figure 6 As shown, a counterweight block clip strip 401 matching with the limiting clip slot 301 is provided on the top of the elastic balancing counterweight block 4 .
[0050] For example, when embedding the elastic balancing weight 4, first embed the elastic balancing weight 4 into the dove tail groove 101, and then continue to push the balancing weight 4 inward along the dove tail groove 10 until the balancing weight strip 401 on the elastic balancing weight 4 cooperates with the limiting groove 301, thereby achieving stable embedding of the elastic balancing weight 4. At this time, the probability of the elastic balancing weight 4 falling off will be greatly reduced.
[0051] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.
Claims
1. A permanent magnet motor rotor, characterized in that: It comprises an inner cylinder (1), a sector-shaped punching sheet (2), an end plate (3) and an elastic balancing weight block (4); An inner cylinder (1) comprising dove-tail grooves (101) arranged in a circular array on its outer surface; A fan-shaped punching sheet (2) is located outside the inner cylinder (1); End plates (3) are located at both ends of the punched sector-shaped punch (2) and are used to limit the axial position of the sector-shaped punch (2) in the inner cylinder (1); The elastic balancing weight (4) is embedded between the dovetail groove (101) and the end plate (3) and is used to balance the mass of the rotor.
2. The permanent magnet motor rotor according to claim 1, characterized in that: The dove tail groove (101) penetrates the inner tube (1) along the length direction of the inner tube (1).
3. The permanent magnet motor rotor according to claim 2, characterized in that: The fan-shaped punching piece (2) is provided with a dove tail (201) matched with the dove tail groove (101).
4. The permanent magnet motor rotor according to claim 3, characterized in that: The sector-shaped punching sheet (2) is provided with a magnetic steel groove (202) for installing the magnetic steel.
5. The permanent magnet motor rotor according to claim 1, characterized in that: The elastic balancing weight (4) has the same shape as the cross-section of the dovetail groove (101).
6. The permanent magnet motor rotor according to claim 5, characterized in that: The mass of the elastic balancing weight (4) is 0.2g-10g.
7. The permanent magnet motor rotor according to claim 1, characterized in that: The end plate (3) is provided with a limiting slot (301) for limiting the position of the elastic balancing weight block (4).
8. The permanent magnet motor rotor according to claim 7, characterized in that: The width of the limiting slot (301) is smaller than the thickness of the elastic balancing weight (4).
9. The permanent magnet motor rotor according to claim 8, characterized in that: The top of the elastic balancing weight block (4) is provided with a weight block clamping strip (401) which matches the limiting clamping groove (301).
10. A permanent magnet motor, comprising a stator, a rotor, a casing and an end cover; A rotor, which is a permanent magnet motor rotor as claimed in any one of claims 1 to 9; The stator, located outside the rotor; a casing, located outside the stator; End covers are located at both ends of the stator and rotor.