Rotor core, rotor, motor and household appliance

Abstract

The utility model discloses a rotor iron core, a rotor, a motor and a household electrical appliance, the rotor iron core comprises a plurality of salient poles, the plurality of salient poles are distributed along the circumferential direction of the rotor iron core, the outer circumferential surface of each salient pole is provided with a balancing groove which is recessed towards the center of the rotor iron core, and the balancing grooves are arranged in the balancing grooves. And the balance groove is used for correcting the dynamic balance amount of the rotor iron core. Therefore, through the arrangement of the rotor iron core, the weight of the rotor iron core can be reduced and the manufacturing process can be simplified on the premise of correcting the dynamic balance amount of the rotor iron core, so that the operation stability and the economical efficiency of the rotor are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of household electrical appliances, in particular to a rotor core, a rotor, a motor and a household electrical appliance. Background Art

[0002] With the development of brushless motors, the motors of household appliances are gradually developing from brushed motors to brushless motors, and the speed of brushless motors is getting higher and higher. For rotating parts, the dynamic balance of the rotor system is closely related to the noise of the motor, the life of the bearings, etc. The quality of the rotor dynamic balance directly reflects the intuitive feeling under the operating conditions of a motor. Therefore, the rotor dynamic balancing process has become an indispensable step in motor production. Rotor dynamic balancing is mainly divided into two categories, one is weight-added balancing and the other is weight-reduced balancing.

[0003] In the related technology, the rotor dynamic balancing of the motor on the market is weight reduction balancing, and the main weight reduction method is to add aluminum alloy balance rings on the left and right ends of the rotor assembly, and cut the balance rings to trim the rotor dynamic balance. On the one hand, this dynamic balancing technology requires the addition of two aluminum alloy balance rings, which leads to an increase in the cost of the motor; on the other hand, the two added balance rings have a certain weight, which increases the rotational inertia of the rotor system, which has a certain impact on the starting time and response speed of the motor. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide a rotor core, which can reduce the weight of the rotor core and simplify the manufacturing process while correcting the dynamic balance of the rotor core.

[0005] The utility model further provides a rotor.

[0006] The utility model further provides a motor.

[0007] The utility model further provides a household appliance.

[0008] According to the first aspect of the utility model, the rotor core comprises: a plurality of salient poles, the plurality of salient poles are distributed along the circumference of the rotor core, and the outer peripheral surface of the salient pole is formed with a balancing groove recessed toward the center of the rotor core, and the balancing groove is used to correct the dynamic balance of the rotor core.

[0009] Therefore, by providing the rotor core, the weight of the rotor core can be reduced and the manufacturing process can be simplified while correcting the dynamic balance of the rotor core, thereby improving the operating stability and economy of the rotor.

[0010] In some examples of the present invention, the balancing slot penetrates the outer circumferential surface of the salient pole along the axial direction of the rotor core.

[0011] In some examples of the present invention, the width of the balancing slot first increases and then decreases along the axial direction of the rotor core; or along the axial direction of the rotor core, the width of the balancing slot is equal.

[0012] In some examples of the present invention, along the circumference of the rotor core, the balancing slot is located in the middle of the outer circumferential surface of the salient pole.

[0013] In some examples of the present invention, the depth of the balancing groove is a, and a satisfies the relationship: 1mm≤a≤10mm.

[0014] In some examples of the present invention, the rotor core includes: a plurality of rotor punchings, which are stacked in sequence along the axial direction of the rotor, a plurality of protruding rivet points are arranged inside the rotor punchings along the axial direction of the rotor core, and two adjacent rotor punchings are riveted together through the rivet points.

[0015] According to the second aspect of the present invention, the rotor comprises: the above-mentioned rotor core, each of the salient poles is provided with a magnetic steel slot, and the center of the rotor core is provided with an axial hole; a magnetic steel, the magnetic steel is located in the magnetic steel slot; and a rotating shaft, the rotating shaft passes through the axial hole.

[0016] In some examples of the present invention, the magnetic steel slot is provided with a limiting step, and the end face of the magnetic steel in the length direction is abutted against the limiting step; and / or the magnetic steel slot is provided with a magnetic passage opening along its length direction.

[0017] The motor according to the third aspect of the utility model comprises: the above-mentioned rotor.

[0018] A household appliance according to a fourth aspect of the utility model comprises: the above-mentioned motor.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is a schematic structural diagram of a rotor according to an embodiment of the utility model;

[0022] Figure 2 is a top view of a rotor according to an embodiment of the utility model;

[0023] Figure 3 is an exploded diagram of a motor according to an embodiment of the utility model.

[0024] Reference numerals:

[0025] 100, rotor core; 200, rotor; 300, stator; 400, motor;

[0026] 1. Salient pole; 11. Balancing slot; 12. Magnetic steel slot; 121. Limiting step; 122. Magnetic outlet; 13. Shaft hole;

[0027] 21. Riveting point; 3. Magnetic steel; 4. Rotating shaft. DETAILED DESCRIPTION

[0028] Embodiments of the present invention are described in detail below, and the embodiments described with reference to the accompanying drawings are exemplary.

[0029] Reference below Figure 1-Figure 3 The rotor core 100 according to the embodiment of the present invention is described. On the premise of correcting the dynamic balance of the rotor core 100 , the weight of the rotor core 100 can be reduced and the manufacturing process can be simplified.

[0030] Combination Figure 1-Figure 3 As shown, the rotor core 100 according to the embodiment of the first aspect of the utility model includes a plurality of salient poles 1. The salient poles 1 may be permanent magnets or electromagnets with windings, so as to generate a magnetic field; the geometric shape of the salient poles 1 may enhance the magnetic coupling of the motor 400, thereby improving the torque output of the motor 400, and the geometric shape of the salient poles 1 may also help optimize the efficiency of the motor 400, by improving the distribution of the magnetic flux to reduce the eddy current loss, so that the motor 400 maintains efficient operation in a wide speed range.

[0031] In addition, as a part of the magnetic circuit, the rotor core 100 can provide a low magnetic resistance path for the magnetic flux, and can also be used to support the winding and connect the rotor 200 shaft to ensure the mechanical strength and stability of the rotor 200 when rotating at high speed.

[0032] Specifically, a plurality of salient poles 1 are distributed along the circumference of the rotor core 100 , and a balancing groove 11 recessed toward the center of the rotor core 100 is formed on the outer circumferential surface of the salient pole 1 . The balancing groove 11 is used to correct the dynamic balance of the rotor core 100 .

[0033] Specifically, a plurality of salient poles 1 are distributed in sequence in the circumferential direction of the rotor core 100 (that is, the salient poles 1 are radially protruding and arranged on the outer surface of the rotor core 100), and a balancing groove 11 which is radially recessed toward the center of the rotor core 100 is formed on the outer circumferential surface of the salient pole 1. The balancing groove 11 can be used to correct the dynamic balance of the rotor core 100 (that is, the rotor core 100 will generate unbalanced force due to uneven mass distribution during operation, which will cause vibration and noise problems of the rotor 200), thereby ensuring the operating stability of the motor 400 and extending its service life.

[0034] In summary, as in the above design, by opening the balancing groove 11 on the salient pole 1, it is ensured that the final rotor 200 can run smoothly within its designed speed range, reducing damage to bearings and other mechanical components.

[0035] In addition, compared with the traditional design method of adding aluminum alloy balance rings on the left and right ends of the rotor assembly and then cutting the balance rings to perform rotor dynamic balance correction, the rotor core 100 in this case is provided with a balance groove 11 directly on the outer peripheral surface of the salient pole 1. On the one hand, this can avoid the addition of new parts, thereby simplifying the assembly process and reducing manufacturing costs. On the other hand, it can also reduce the weight of the rotor core 100 and reduce the rotational inertia of the rotor core 100, thereby shortening the starting time of the motor 400 and improving the response speed of the motor 400, thereby improving the practicality and economy of the motor 400.

[0036] Therefore, by providing the rotor core 100 , the weight of the rotor core 100 can be reduced and the manufacturing process can be simplified while correcting the dynamic balance of the rotor core 100 , thereby improving the operating stability and economy of the rotor 200 .

[0037] According to some optional embodiments of the present invention, combined with Figure 1 As shown, the balance groove 11 passes through the outer peripheral surface of the salient pole 1 along the axial direction of the rotor core 100. Such an arrangement allows the machining tool to smoothly enter the interior of the rotor core 100 from one axial end thereof and then exit from the other axial end of the rotor core 100, thereby ensuring the smooth machining of the balance groove 11.

[0038] According to some optional embodiments of the present invention, combined with Figure 1 As shown, the width of the balancing groove 11 first increases and then decreases along the axial direction of the rotor core 100. Such an arrangement can facilitate the cutting tool to perform smooth cutting work, and the balancing groove 11 of such a shape can also better disperse the stress and reduce the risk of local stress overload at the axial end edges of the rotor core 100, thereby better ensuring the structural strength of the rotor core 100 at the balancing groove 11.

[0039] Optionally, along the axial direction of the rotor core 100 , the widths of the balancing slots 11 are equal, that is, the opening shapes of the balancing slots 11 can be opened accordingly according to the shapes of the cutter heads of different manufacturers, thereby increasing the shape diversity of the balancing slots 11 .

[0040] According to some optional embodiments of the present invention, combined with Figure 1 As shown, along the circumference of the rotor core 100, the balance slot 11 is located in the middle of the outer peripheral surface of the salient pole 1. Such an arrangement is more conducive to helping disperse stress and avoid stress concentration, thereby ensuring the overall structural strength and stability; it can also be beneficial to positioning and alignment work during the processing and manufacturing process, thereby improving manufacturing efficiency and manufacturing quality.

[0041] According to some optional embodiments of the present invention, the depth of the balancing groove 11 is a, and a satisfies the relationship: 1mm≤a≤10mm. Specifically, the depth of the balancing groove 11 is small, so that on the basis of ensuring the overall structural strength of the rotor core 100, the mass can be removed at the specified position of the salient pole 1 to achieve the effect of correcting the dynamic balance of the rotor core 100, thereby improving its practicality. For example, the depth a of the balancing groove 11 can be 1mm, 2mm, 5mm and 10mm, but is not limited thereto.

[0042] According to some optional embodiments of the present invention, the rotor core 100 includes a plurality of rotor punchings, which are stacked in sequence along the axial direction of the rotor 200 , and a plurality of protruding rivet points 21 are arranged inside the rotor punchings along the axial direction of the rotor core 100 , and two adjacent rotor punchings are riveted together through the rivet points 21 .

[0043] Specifically, the rotor core 100 is mainly formed by stacking a plurality of rotor punchings (the rotor punchings are the basic units constituting the rotor core 100, which are punched from silicon steel sheets with high magnetic permeability through a stamping die), and insulating paint is usually applied between the rotor punchings to reduce eddy current losses.

[0044] Among them, since the motor 400 will generate an alternating magnetic field when running, eddy currents will be generated in the rotor core 100, resulting in energy loss. By decomposing the rotor core 100 into many thin sheets (that is, rotor punchings) and insulating them from each other, the eddy current losses can be effectively reduced and the efficiency of the motor 400 can be improved. The rotor punchings can also be customized according to the specific design requirements of the motor 400, including the shape, size and position of the slots, to adapt to different winding types and cooling strategies; it can also achieve the effect of mass production of rotor punchings to manufacture cores, thereby improving production efficiency and cost-effectiveness; the gaps between the rotor punchings can also be used to achieve the effect of heat conduction and cooling inside the motor 400.

[0045] Furthermore, combined with Figure 1 and Figure 2As shown, a plurality of protruding rivet points 21 are arranged in the rotor punching along the axial direction of the rotor core 100, and two adjacent rotor punchings are riveted together through the rivet points 21, so as to ensure that the rotor core 100 maintains structural stability when the motor 400 is running, while reducing eddy current losses, thereby improving the working efficiency of the motor 400; and riveting is a fast and reliable fixing method, which is suitable for large-scale production, thereby improving manufacturing efficiency.

[0046] Among them, the positions of the rivet points 21 are first preset on the rotor punchings, and then multiple rotor punchings are stacked together in the correct order. In the stacked rotor punchings, the pre-designed positions of the rivet points 21 will pass through all the rotor punchings to form a series of through holes, and finally rivets are placed in these holes or riveting tools are used to tightly connect the rotor punchings at these rivet points 21 through compression force.

[0047] Combination Figure 1 and Figure 2 As shown, the rotor 200 according to the embodiment of the second aspect of the utility model includes the above-mentioned rotor core 100, magnetic steel 3 and rotating shaft 4, each salient pole 1 is provided with a magnetic steel slot 12, an axial hole 13 is provided at the center of the rotor core 100, the magnetic steel 3 is located in the magnetic steel slot 12, and the rotating shaft 4 is penetrated by the axial hole 13.

[0048] Specifically, combined Figure 1 and Figure 2 As shown, each salient pole 1 is provided with a magnetic steel slot 12 for placing the magnetic steel 3. The magnetic steel slot 12 can provide an installation and accommodation position for the magnetic steel 3, ensuring that the magnetic steel 3 can be firmly installed on the rotor core 100, maintaining correct positioning and alignment, and avoiding displacement during the operation of the motor 400; it can also affect the magnetic flux path inside the motor 400, affect the magnetic field strength and distribution of the magnetic steel 3, and thus affect the electromagnetic performance of the motor 400; it can also help to increase the surface area of ​​the rotor core 100 to promote heat dissipation, thereby improving thermal conductivity.

[0049] Among them, the magnetic steel 3 is a key component for generating a magnetic field in the motor 400, and is usually made of high-performance magnetic materials, such as neodymium iron boron (NdFeB) alloy. The magnetic steel 3 has high magnetization strength and coercive force, and can generate a strong constant magnetic field in the motor 400. The magnetic steel 3 is the main source of the magnetic field of the motor 400, and it interacts with the rotating magnetic field generated by the stator 300 winding to drive the rotor 200 of the motor 400 to rotate.

[0050] Furthermore, a shaft hole 13 connected to the rotating shaft 4 is provided at the center of the rotor core 100, which can convert electromagnetic energy into mechanical energy, so that the rotor core 100 drives the rotating shaft 4 to rotate.

[0051] According to some optional embodiments of the present invention, combined with Figure 2As shown, the magnetic steel slot 12 is provided with a limiting step 121, and the end surface of the magnetic steel 3 in the length direction is abutted against the limiting step 121; the magnetic steel slot 12 is provided with a magnetic passage opening 122 along its length direction.

[0052] Among them, the limiting step 121 can limit the magnet 3, thereby ensuring the position stability of the magnet 3 in the magnet slot 12; the magnetic opening 122 can facilitate the passage of magnetic field lines, thereby reducing the noise problem of the rotor 200 during operation.

[0053] The motor 400 according to the third aspect of the present invention includes the rotor 200 of the above embodiment. The motor 400 with the rotor 200 can improve the efficiency of the motor 400, reduce operating noise and manufacturing costs, and thus improve its practicality.

[0054] In addition, combined Figure 3 As shown, the motor 400 also includes a stator 300. When current passes through the windings on the stator 300, a rotating magnetic field is generated. The rotating magnetic field interacts with the permanent magnets (that is, magnetic steel) on the rotor 200 to generate torque, so that the rotor 200 rotates. In addition, the electronic controller can also detect the position of the rotor 200 in real time and switch the current in the windings accordingly to maintain the rotation of the magnetic field, so that the motor 400 continues to rotate.

[0055] The following describes the steps for dynamic balancing of the rotor core 100:

[0056] 1. Analyze the cause of the imbalance (first, it is necessary to determine the cause of the imbalance of the rotor 200, which may be caused by manufacturing defects, wear, assembly errors or uneven materials)

[0057] 2. Select the correction surface (determine which planes to correct on, usually at least two planes are required for effective dynamic balancing correction)

[0058] 3. Measure the unbalance amount (use a dynamic balancing machine or other vibration measuring equipment to detect the unbalance amount and unbalance phase angle of the rotor 200)

[0059] 4. Determine the correction plan (calculate how much mass needs to be removed and where to do it based on the imbalance and phase angle)

[0060] 5. Implement correction (remove material at a specified position of the salient pole 1, such as milling the balancing groove 11, or integrally forming the balancing groove 11) to reduce local mass.

[0061] 6. Verify the correction effect (re-measure the vibration level of the rotor 200 to confirm whether the required balance standard is achieved. If necessary, multiple rounds of correction and verification may be required until the vibration level of the rotor 200 meets the requirements)

[0062] The household appliance according to the fourth aspect of the present invention comprises the motor 400 of the above embodiment. The household appliance having the motor 400 can improve working efficiency and reduce manufacturing costs, thereby improving market competitiveness.

[0063] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0064] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0065] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0066] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

[0067] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0068] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A rotor core, characterized in that: include: A plurality of salient poles are distributed along the circumference of the rotor core, and a balancing groove recessed toward the center of the rotor core is formed on the outer circumferential surface of the salient pole, and the balancing groove is used to correct the dynamic balance of the rotor core.

2. The rotor core according to claim 1, characterized in that: The balancing groove penetrates the outer peripheral surface of the salient pole along the axial direction of the rotor core.

3. The rotor core according to claim 1, characterized in that: The width of the balance slot increases first and then decreases along the axial direction of the rotor core; or Along the axial direction of the rotor core, the widths of the balancing slots are equal.

4. The rotor core according to claim 1, characterized in that: Along the circumferential direction of the rotor core, the balancing groove is located in the middle of the outer circumferential surface of the salient pole.

5. The rotor core according to claim 1, characterized in that: The depth of the balancing groove is a, and a satisfies the relationship: 1mm≤a≤10mm.

6. The rotor core according to claim 1, characterized in that: The rotor core comprises: A plurality of rotor punchings are stacked in sequence along the axial direction of the rotor, a plurality of protruding rivet points are arranged inside the rotor punchings along the axial direction of the rotor core, and two adjacent rotor punchings are riveted together through the rivet points.

7. A rotor, characterized in that: include: The rotor core according to any one of claims 1 to 6, wherein each of the salient poles is provided with a magnetic steel slot, and the center of the rotor core is provided with an axial hole; A magnetic steel, wherein the magnetic steel is located in the magnetic steel slot; A rotating shaft is provided with the shaft hole.

8. The rotor according to claim 7, characterized in that The magnetic steel slot is provided with a limiting step, and the end surface of the magnetic steel in the length direction is abutted against the limiting step; and / or The magnetic steel slot is provided with a magnetic passage opening along its length direction.

9. A motor, characterized in that: include: A rotor as claimed in any one of claims 7 to 8.

10. A household appliance, characterized in that: include: The motor as claimed in claim 9.

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