Motor and permanent magnet tile thereof
The arc-shaped permanent magnet tile with cut angles and variable diameter inner surface addresses torque fluctuation and vibration issues in motors by gradually increasing magnetic field energy, enhancing operational stability and reducing noise.
Patent Information
- Application Number
- CN202420608833.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-27
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-03-27
AI Technical Summary
Existing motor designs experience significant torque fluctuation and vibration due to sudden increases in magnetic field energy, leading to increased noise and vibration during operation.
A permanent magnet tile with an arc-shaped contour and cut angles at both ends, where the thickness gradually increases from the ends to the center, and the inner arc surface features a variable diameter, reducing the sudden increase in magnetic field energy and torque fluctuation.
The design significantly reduces torque fluctuation and motor vibration by smoothing the magnetic field energy transition, resulting in improved operational stability and reduced noise.
Smart Images
Figure CN222191933U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of motors, in particular to a motor and a permanent magnet tile thereof. Background Art
[0002] With the accelerated development of the automobile industry, people's demand for automobiles has changed from basic transportation needs to intelligent, comfortable, and lightweight needs. More and more equipment needs to be electrified, and electrification is the foundation. In this environment, electric motors have developed rapidly in the automotive industry, and the requirements for motors are getting higher and higher, with small size, large torque, and low noise. A motor refers to an electromagnetic device that realizes the conversion or transmission of electrical energy according to the law of electromagnetic induction. Its main function is to generate driving torque as a power source for electrical appliances or various machines. The motor is mainly composed of a magnetic core, a coil winding, a casing, etc.
[0003] like Figure 1 and 2 As shown in FIG. 1 , a schematic diagram of a magnetic tile in the prior art being installed inside a motor housing, in which the outer arc surface of the magnetic tile and its two side end surfaces are fully compatible with the motor housing. Figure 3 As shown in the figure, Figure 2 The rotor outer diameter surface magnetic waveform distribution diagram in the existing motor structure is shown in the figure. It can be seen from the figure that when the rotor enters this place, the magnetic field will suddenly increase, thereby increasing the surface magnetic fluctuation. From the surface magnetic waveform, it is close to a square wave shape, thereby increasing the torque fluctuation and causing greater vibration when the motor is running.
[0004] In addition, Figure 4 As shown, it is the cogging torque variation diagram of the existing motor structure.
[0005] Attached Figure 5 As shown, it is a torque shift change diagram of the existing motor structure. Summary of the invention
[0006] In order to solve the above problems, the first purpose of the utility model is to provide a permanent magnetic tile. It is measured that when the rotor enters this place, the magnetic field energy can increase slowly, so that the torque fluctuation changes less and the motor running vibration is smaller.
[0007] In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:
[0008] A permanent magnetic tile, the overall contour of which is constructed as an arc shape; it is characterized in that: the two ends of the outer arc surface of the permanent magnetic tile are constructed with a first cut angle extending to the side wall of the permanent magnetic tile; from the two ends to the center, the thickness of the permanent magnetic tile gradually increases.
[0009] The utility model adopts the above technical solution, which relates to a permanent magnet tile. On the basis of the overall arc-shaped contour, the permanent magnet tile has a first cut angle cut at both ends of the outer arc surface, and the first cut angle extends to the side wall of the permanent magnet tile. In this way, the thickness of the permanent magnet tile gradually increases from the two ends to the center. After the above-mentioned edge cutting, the thickness of the permanent magnet tile changes significantly from both sides to the neutral point. It is measured that when the rotor enters this place, the magnetic field energy can be increased more slowly, so that the torque fluctuation changes less and the motor operation vibration is smaller.
[0010] In a specific embodiment, the cut surface formed inside the first cut angle is a plane, which makes it easier to chamfer the plane edge and makes the magnet thickness gradient more gentle.
[0011] Preferably, the inner arc surface of the permanent magnet tile is constructed as a variable diameter arc surface with a small center radius and large two end radii.
[0012] Preferably, the cutting length a of the first cutting angle at the side wall of the permanent magnet tile is substantially equal to the cutting length b of the first cutting angle at the end of the outer arc surface of the permanent magnet tile. In the scheme here, when the permanent magnet tile is chamfered, the cutting length b for the outer arc surface is larger, so that the chamfering angle is larger and the gradual change of the tile thickness is gentler.
[0013] In a further embodiment, the two ends of the inner arc surface of the permanent magnet tile are constructed with a second cut angle extending to the side wall of the permanent magnet tile, and the cut surface formed in the second cut angle is a plane. The second cut angle constructed at the two ends of the inner arc surface of the permanent magnet tile in this scheme cooperates with the first cut angle, so that the front and rear sides of the two ends of the permanent magnet tile have a gradual change in the thickness direction.
[0014] The second purpose of the utility model is to provide a motor, including a shell, and a stator assembly and a rotor assembly arranged inside the shell; the stator assembly includes multiple permanent magnetic tiles fixed on the inner wall of the shell, and the rotor assembly is arranged in an area enclosed by multiple permanent magnetic tiles; it is characterized in that: the permanent magnetic tiles are the permanent magnetic tiles as described above. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of the existing magnetic tile structure.
[0016] Figure 2 The figure is a schematic diagram of the structure of the existing magnetic shoe installed in the motor.
[0017] Figure 3 This is the magnetic waveform distribution diagram of the rotor outer diameter surface in the existing motor structure.
[0018] Figure 4 This is a diagram showing the cogging torque variation of an existing motor structure.
[0019] Figure 5This is the torque change diagram of the existing motor structure.
[0020] Figure 6 A schematic diagram of the magnetic tile structure is created for the present invention.
[0021] Figure 7 The present invention provides a schematic structural diagram of a magnetic shoe installed in a motor.
[0022] Figure 8 The invention creates a magnetic waveform distribution diagram of the rotor outer diameter surface in the motor structure.
[0023] Fig. 9 A cogging torque variation diagram of a motor structure is created for the present invention.
[0024] Fig.10 A torque shift variation diagram of a motor structure is created for the present invention. DETAILED DESCRIPTION
[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0026] 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", "clockwise", "counterclockwise" 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 device or element referred to 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.
[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying 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 one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more, unless otherwise clearly defined.
[0028] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like 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 an indirect connection 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 the present invention can be understood according to specific circumstances.
[0029] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is substantially equal in level to the second feature. Example
[0030] like Figure 6 As shown, the present embodiment relates to a permanent magnet tile, and the overall contour of the permanent magnet tile 1 is constructed as an arc shape. The two ends of the outer arc surface 12 of the permanent magnet tile 1 are constructed with a first cut angle 10 extending to the side wall 13 of the permanent magnet tile 1; from the two ends to the center, the thickness of the permanent magnet tile 1 gradually increases. On the basis of the overall arc contour, the permanent magnet tile 1 cuts a first cut angle 10 at the two ends of the outer arc surface 12, and the first cut angle 10 extends to the side wall 13 of the permanent magnet tile 1. In this way, the thickness of the permanent magnet tile 1 gradually increases from the two ends to the center. After the above-mentioned chamfering, the thickness of the permanent magnet tile 1 from both sides to the neutral point changes significantly. It is measured that when the rotor enters this place, the magnetic field energy can be increased slowly, so that the torque fluctuation changes less and the motor operation vibration is smaller.
[0031] In such Figure 6 In the specific implementation scheme shown, the cut surface formed inside the first cutting angle 10 is a plane 11, and the plane 11 is more convenient to chamfer, and the magnet thickness gradually changes to a gentler state. The cutting length a of the first cutting angle 10 at the side wall 13 of the permanent magnet tile 1 is substantially equal to the cutting length b of the first cutting angle 10 at the end of the outer arc-shaped surface 12 of the permanent magnet tile 1. In this scheme, when the permanent magnet tile 1 is chamfered, the cutting length b of the outer arc-shaped surface 12 is larger, so that the chamfering angle is larger, and the magnet tile thickness gradually changes to a gentler state.
[0032] In a further embodiment, the inner arc surface 14 of the permanent magnet tile 1 is constructed as a variable diameter arc surface with a small center radius and a large radius at both ends. The two ends of the inner arc surface 14 of the permanent magnet tile 1 are constructed with a second cut angle extending to the side wall 13 of the permanent magnet tile 1, and the cut surface formed in the second cut angle is a plane 11. The second cut angle constructed at the two ends of the inner arc surface 14 of the permanent magnet tile 1 in this scheme cooperates with the first cut angle 10, so that the front and rear sides of the two ends of the permanent magnet tile 1 have a gradual change in the thickness direction. Example
[0033] like Figure 7 As shown, this embodiment provides a motor, including a shell 2, and a stator assembly and a rotor assembly 3 arranged inside the shell 2; the stator assembly includes a plurality of permanent magnetic tiles 1 fixed on the inner wall of the shell 2, and the rotor assembly 3 is arranged in an area enclosed by the plurality of permanent magnetic tiles 1; the permanent magnetic tiles 1 are the permanent magnetic tiles 1 described in Example 1.
[0034] like Figure 8 As shown, this is the magnetic waveform distribution diagram of the rotor outer diameter surface of the motor in Example 2. It can be seen from the figure that after edge chamfering, when the rotor enters this place, the magnetic field energy can be increased more slowly, so that the torque fluctuation changes less and the motor vibration is smaller.
[0035] Attached Fig. 9 As shown in FIG. 1 , the cogging torque variation diagram of the motor structure in Example 2 is shown. Figure 4 By comparison, it can be seen that the cogging torque can be significantly reduced after the magnetic shoe is optimized by edge chamfering.
[0036] Attached Fig.10 As shown in the figure, the torque shift change diagram of the motor structure in Example 2 is shown. Figure 5 By comparison, it can be seen that the torque fluctuation can be significantly reduced after the magnetic shoe is optimized by edge trimming.
[0037] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", 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 representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.
[0038] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present invention. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention.
Claims
1. A permanent magnet tile, wherein the overall profile of the permanent magnet tile (1) is constructed in the shape of an arc; characterized in that: The two ends of the outer arc-shaped surface (12) of the permanent magnetic tile (1) are formed with first cut corners (10) extending to the side walls (13) of the permanent magnetic tile (1); the thickness of the permanent magnetic tile (1) gradually increases from the two ends to the center.
2. A permanent magnetic tile according to claim 1, characterized in that: The cut surface formed inside the first cut angle (10) is a plane (11).
3. A permanent magnetic tile according to claim 1, characterized in that: The inner arc surface (14) of the permanent magnet tile (1) is constructed as a variable diameter arc surface with a small central radius and large radii at both ends.
4. A permanent magnetic tile according to claim 2, characterized in that: The cut length a of the first cut angle (10) at the side wall (13) of the permanent magnet tile (1) is substantially equal to the cut length b of the first cut angle (10) at the end of the outer arc-shaped surface (12) of the permanent magnet tile (1).
5. A permanent magnetic tile according to claim 4, characterized in that: The inner arc surface (14) of the permanent magnet tile (1) has a second cut angle at both ends extending to the side wall (13) of the permanent magnet tile (1), and the cut surface formed in the second cut angle is a plane (11).
6. A motor, comprising a housing (2), and a stator assembly and a rotor assembly (3) arranged inside the housing (2); the stator assembly comprises a plurality of permanent magnet tiles (1) fixed to the inner wall of the housing (2), and the rotor assembly (3) is arranged in an area enclosed by the plurality of permanent magnet tiles (1); characterized in that: The permanent magnetic tile (1) is the permanent magnetic tile (1) according to any one of claims 1 to 5.