Rotor assembly of disc type motor and disc type motor

Abstract

The rotor assembly comprises a plurality of rotor iron core units and a plurality of magnetic steels, the plurality of rotor iron core units are arranged at intervals along the circumferential direction, a magnetic steel groove is formed between every two adjacent rotor iron core units, and the magnetic steels are embedded in each magnetic steel groove. The rotor is characterized in that the cross section of a single rotor core unit is T-shaped, the rotor core unit comprises a yoke part and a crown part protruding upwards from the yoke part, two sides of the crown part protrude to form buckles, the buckles abut against the top surface of the magnetic steel to limit the axial displacement of the magnetic steel, and the crown part is adjacent to the air gap surface of the disc type motor. The axial movement of the magnetic steel towards the air gap direction can be limited, and the falling risk of the magnetic steel is reduced.

Description

Technical field:

[0001] The utility model relates to a rotor assembly of a disc-type motor and the disc-type motor. Background technology:

[0002] In existing tangential focusing disk motor rotors, open magnetic steel slots are usually provided on the rotor core for installing magnetic steel. Since the rotor is a rotating component, the magnetic steel slots are set as straight slots, and there is no mechanical structure to restrict each other between the rotor core and the magnetic steel in the radial and axial directions, so the core and the magnetic steel need to be fixed separately. However, the number of rotor cores and magnetic steels of the motor is large, so the installation is difficult, the risk of falling off is large, and the structural reliability of the rotor is low. Its specific structure can be found in Patent No.: CN216530782U, Patent Name: A rotor assembly of a disk motor and a utility model patent for a disk motor.

[0003] The main drawbacks of the above structure are: 1. The magnetic steel slots in the motor rotor are straight slots, and there is no mechanical structure to restrict each other between the rotor core and the magnetic steel in the radial and axial directions. Therefore, the core and the magnetic steel need to be fixed separately, which makes installation difficult, has a high risk of falling off, and has low structural reliability of the rotor; 2. On the air gap surface of the motor rotor, the magnetic steel is not wrapped by the core and directly faces the stator magnetic field, which has a high risk of magnetic demagnetization. Summary of the invention:

[0004] The utility model aims to provide a disc motor rotor assembly and a disc motor, which can solve the technical problems in the prior art that there is no mechanical structure between the rotor core and the magnetic steel to restrict each other, the installation is difficult, and the risk of falling off is high.

[0005] A further object of the present utility model is to provide a rotor assembly of a disc motor and a disc motor, so as to solve the technical problem that the risk of magnetic steel demagnetization is relatively high.

[0006] The purpose of the utility model is achieved through the following technical solutions.

[0007] A rotor assembly of a disc motor comprises a plurality of rotor core units and a plurality of magnets, wherein the plurality of rotor core units are arranged at intervals in the circumferential direction, a magnet slot is formed between two adjacent rotor core units, and a magnet is embedded in each magnet slot. The invention is characterized in that a single rotor core unit has a T-shaped cross section, comprising a yoke and a crown protruding upward from the yoke, both sides of the crown protrude to form a buckle, the buckle is mortgaged on the top surface of the magnet to limit the axial displacement of the magnet, and the crown is adjacent to the air gap surface of the disc motor.

[0008] The magnetizing direction of the above-mentioned magnetic steel is the tangential direction, and the adjacent magnetic steels are arranged relative to each other with the same polarity to enhance the magnetic concentration effect.

[0009] The first inclined surfaces of the above-mentioned rotor core unit are arranged on both sides of the buckle close to the air gap surface, so as to reduce the magnetic field harmonics.

[0010] The surface of the above-mentioned rotor core unit's buckle close to the magnetic steel is a second inclined surface, and the second inclined surface is not parallel to the top surface of the magnetic steel, thereby enhancing the anti-demagnetization capability.

[0011] The tangential section of the magnetic steel is a rectangle or an isosceles trapezoid, the surface of the magnetic steel in the magnetizing direction is close to the rotor core unit, and the shorter side of the rectangular or isosceles trapezoidal tangential section of the magnetic steel is close to the air gap surface.

[0012] The radial cross section of the magnetic steel can be rectangular or isosceles trapezoidal, the surface of the magnetic steel in the magnetizing direction is close to the rotor core unit, and the shorter side of the rectangular or isosceles trapezoidal radial cross section of the magnetic steel is close to the outer circumference of the rotor assembly.

[0013] When the tangential cross section of the magnetic steel is an isosceles trapezoid, the inclination angle is θ1, and when the radial cross section of the magnetic steel is an isosceles trapezoid, the inclination angle is θ2, wherein 1°≤θ1≤4°, 1°≤θ2≤4°.

[0014] The dimensions R1 and R2 on the first inclined surface meet the following conditions: 0.3 mm ≤ R1 ≤ 2 mm, 2 mm ≤ R2 ≤ 6 mm.

[0015] The dimensions HS1 and B1 of the second inclined surface mentioned above meet the conditions: 1mm≤HS1≤4mm, 1mm≤B1≤5mm.

[0016] A disc motor comprises a stator assembly and a rotor assembly, wherein the rotor assembly is the rotor assembly of the disc motor described above.

[0017] Compared with the prior art, the utility model has the following effects:

[0018] Effect 1: In the rotor assembly of the utility model, the cross section of a single rotor core unit is T-shaped, including a yoke and a crown protruding upward from the yoke, and the two sides of the crown protrude to form a buckle, which is mortgaged on the top surface of the magnetic steel to limit the axial displacement of the magnetic steel. The crown is adjacent to the air gap surface of the disc motor, which can limit the axial movement of the magnetic steel in the air gap direction, reduce the risk of the magnetic steel falling off, and is simple to install;

[0019] Effect 2: By optimizing the size of the first slope, the magnetic field harmonics can be reduced, the torque pulsation can be reduced, the loss can be reduced, and the efficiency can be improved;

[0020] Effect 3: Adding protruding buckles on both sides of the crown, the buckle part wraps the magnetic steel, which can enhance the anti-demagnetization ability of the magnetic steel. By optimizing the size of the second bevel, the anti-demagnetization ability of the magnetic steel can be greatly improved;

[0021] Effect 4: The tangential section of the magnetic steel is set to an isosceles trapezoid. When the rotor core is cast in one piece of aluminum, the design angle is tilted, and the magnetic steel slot is easier to demold;

[0022] Effect 5: The radial cross section is set to an isosceles trapezoid. The magnetic steel is narrow on the outside and wide on the inside in the radial direction. When the rotor assembly rotates, the rotor core unit will limit the radial outward movement of the magnetic steel. There is no need to fix the magnetic steel separately in the radial direction, which simplifies the structure. Description of the drawings:

[0023] Figure 1 It is a three-dimensional diagram of a disc motor of the first embodiment of the utility model at one angle;

[0024] Figure 2 It is a three-dimensional diagram of the disc motor of the first embodiment of the utility model from another angle;

[0025] Figure 3 It is a front view of the disc motor of the first embodiment of the utility model;

[0026] Figure 4 It is a three-dimensional diagram of the rotor assembly of the disc motor according to the first embodiment of the utility model;

[0027] Figure 5 It is a partial exploded view of the rotor assembly of the disc motor of the first embodiment of the utility model;

[0028] Figure 6 It is a front view of a rotor core unit of a rotor assembly of a disc-type motor according to the first embodiment of the utility model;

[0029] Figure 7 yes Figure 6 A partial enlarged view of part B;

[0030] Figure 8 It is a three-dimensional diagram of the rotor assembly of the disc motor provided in the second embodiment of the utility model;

[0031] Fig. 9 This is a schematic diagram of the structure of the magnetic steel in the rotor assembly provided in the second embodiment of the present utility model;

[0032] Fig.10 It is a three-dimensional diagram of the rotor assembly of the disc motor provided by the third embodiment of the present utility model;

[0033] Fig.11 This is a schematic diagram of the structure of the magnetic steel in the rotor assembly provided in the third embodiment of the present utility model;

[0034] Fig.12 It is a three-dimensional diagram of the rotor assembly of the disc motor provided by the fourth embodiment of the utility model;

[0035] Fig.13It is a schematic diagram of the structure of the magnetic steel in the rotor assembly provided in the fourth embodiment of the present utility model. Specific implementation method:

[0036] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0037] Embodiment 1: Figures 1 to 7 As shown, a disc-type motor includes a stator assembly 20 and a rotor assembly 10, the stator assembly 20 and the rotor assembly 10 are axially magnetically coupled, and an air gap surface 30 is arranged between the stator assembly 20 and the rotor assembly 10;

[0038] The rotor assembly 10 includes a plurality of rotor core units 1 and a plurality of magnets 2. The plurality of rotor core units 1 are arranged at intervals along the circumferential direction. A magnet groove 11 is formed between two adjacent rotor core units 1. A magnet 2 is embedded in each magnet groove 11. The rotor assembly 10 is characterized in that: the cross section of a single rotor core unit 1 is T-shaped, including a yoke 12 and a crown 13 protruding upward from the yoke 12. Both sides of the crown 13 protrude to form a buckle 130. The buckle 130 is mortgaged on the top surface of the magnet 2 to limit the axial displacement of the magnet 2. The crown 13 is adjacent to the air gap surface 30 of the disc motor. The buckle 130 can limit the axial movement of the magnet in the air gap direction and reduce the risk of the magnet falling off.

[0039] The magnetizing direction of the magnetic steel 2 is the tangential direction, and two adjacent magnetic steels 2 are arranged relative to each other with the same polarity to enhance the magnetic concentration effect.

[0040] The first inclined surfaces 131 of the above-mentioned rotor core unit 1 are arranged on both sides close to the air gap surface 30 to reduce magnetic field harmonics. The dimensions R1 and R2 on the first inclined surface 131 meet the conditions: 0.3mm≤R1≤2mm, 2mm≤R2≤6mm. By optimizing the dimensions of the first inclined surface, magnetic field harmonics can be reduced, torque pulsation can be reduced, losses can be reduced, and efficiency can be improved.

[0041] The surface of the buckle 130 of the rotor core unit 1 close to the magnetic steel 2 is the second inclined surface 132, and the second inclined surface 132 is not parallel to the top surface of the magnetic steel 2, which enhances the anti-demagnetization capability. The buckles 130 protruding on both sides of the crown are added, and the buckles 130 partially wrap the magnetic steel 2, which can enhance the anti-demagnetization capability of the magnetic steel 2. The size of the second inclined surface 132 can greatly improve the anti-demagnetization capability of the magnetic steel; the sizes HS1 and B1 of the second inclined surface 132 meet the conditions: 1mm≤HS1≤4mm, 1mm≤B1≤5mm.

[0042] The shape of the magnetic steel 2 is a cuboid, that is, the cross-sections in the tangential direction and the radial plane are both rectangular.

[0043] Embodiment 2:

[0044] Based on the first embodiment, the structure of the magnetic steel 2 and the rotor core unit 1 of the rotor assembly is improved in this embodiment, such as Figure 8 and Fig. 9 As shown, the tangential section of the magnetic steel 2 is an isosceles trapezoid, the surface of the magnetic steel 2 in the magnetizing direction (i.e., tangential magnetization) is in close contact with the rotor core unit 1, and the shorter side of the isosceles trapezoidal tangential section of the magnetic steel 2 (i.e., the upper base of the isosceles trapezoid) is close to the air gap surface 30. The radial section of the magnetic steel 2 is a rectangle, and the magnetic steel 2 is narrow in the tangential direction and wide at the bottom. When the rotor assembly rotates, the rotor core unit 1 will limit the axial outward movement of the magnetic steel 2, and there is no need to fix the magnetic steel separately in the axial direction, thereby simplifying the structure.

[0045] Embodiment three:

[0046] Based on the first embodiment, the structure of the magnetic steel 2 and the rotor core unit 1 of the rotor assembly is improved in this embodiment, such as Fig.10 and Fig.11 As shown, the tangential section of the magnet 2 is a rectangle, the radial section of the magnet 2 is an isosceles trapezoid, the magnetizing direction (i.e. tangential magnetization) surface of the magnet 2 is in close contact with the rotor core unit 1, and the shorter side (i.e. the upper base of the isosceles trapezoid) of the isosceles trapezoid radial section of the magnet 2 is close to the outer circumference of the rotor assembly. The magnet 2 is narrow inside and wide outside in the radial direction. When the rotor assembly rotates, the rotor core unit 1 will limit the radial outward movement of the magnet 2. There is no need to fix the magnet separately in the radial direction, simplifying the structure.

[0047] Embodiment 4:

[0048] Based on the first embodiment, the structure of the magnetic steel 2 and the rotor core unit 1 of the rotor assembly is improved in this embodiment, such as Fig.12 and Fig.13 As shown, the tangential cross-section of the magnetic steel 2 is an isosceles trapezoid, and the radial cross-section of the magnetic steel 2 is an isosceles trapezoid. When the tangential cross-section of the magnetic steel 2 is an isosceles trapezoid, the inclination angle is θ1, and when the radial cross-section of the magnetic steel 2 is an isosceles trapezoid, the inclination angle is θ2, wherein 1°≤θ1≤4°, 1°≤θ2≤4°.

[0049] When the rotor assembly rotates, the rotor core unit 1 will limit the radial outward movement of the magnetic steel 2, and there is no need to fix the magnetic steel separately in the radial direction, thereby simplifying the structure.

[0050] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A rotor assembly of a disc-type motor, comprising a plurality of rotor core units (1) and a plurality of magnetic steels (2), wherein the plurality of rotor core units (1) are arranged at intervals along the circumferential direction, a magnetic steel slot (11) is formed between two adjacent rotor core units (1), and a magnetic steel (2) is embedded in each magnetic steel slot (11), characterized in that: The cross section of a single rotor core unit (1) is T-shaped, comprising a yoke (12) and a crown (13) protruding upward from the yoke (12), with both sides of the crown (13) protruding to form buckles (130), the buckles (130) being secured on the top surface of the magnetic steel (2) to limit the axial displacement of the magnetic steel (2), and the crown (13) being adjacent to the air gap surface (30) of the disc motor.

2. The rotor assembly of a disc motor according to claim 1, characterized in that: The magnetizing direction of the magnetic steel (2) is the tangential direction, and two adjacent magnetic steels (2) are arranged relative to each other with the same polarity, thereby enhancing the magnetic concentration effect.

3. The rotor assembly of a disc motor according to claim 2, characterized in that: The first inclined surfaces (131) of the buckle (130) of the rotor core unit (1) are arranged on both sides close to the air gap surface (30) and are used to reduce magnetic field harmonics.

4. A rotor assembly of a disc motor according to claim 1, 2 or 3, characterized in that: The surface of the buckle (130) of the rotor core unit (1) close to the magnetic steel (2) is a second inclined surface (132), and the second inclined surface (132) is not parallel to the top surface of the magnetic steel (2), thereby enhancing the anti-demagnetization capability.

5. A rotor assembly of a disc motor according to claim 1, 2 or 3, characterized in that: The tangential cross section of the magnetic steel (2) is a rectangle or an isosceles trapezoid, the surface of the magnetic steel (2) in the magnetizing direction is closely attached to the rotor core unit (1), and the shorter side of the rectangular or isosceles trapezoidal tangential cross section of the magnetic steel (2) is close to the air gap surface (30).

6. A rotor assembly of a disc motor according to claim 1, 2 or 3, characterized in that: The radial cross section of the magnetic steel (2) can be a rectangle or an isosceles trapezoid, the surface of the magnetic steel (2) in the magnetizing direction is closely attached to the rotor core unit (1), and the shorter side of the rectangular or isosceles trapezoidal radial cross section of the magnetic steel (2) is close to the outer circumference of the rotor assembly.

7. A rotor assembly of a disc motor according to claim 1, 2 or 3, characterized in that: When the tangential cross section of the magnetic steel (2) is an isosceles trapezoid, the inclination angle is θ1, and when the radial cross section of the magnetic steel (2) is an isosceles trapezoid, the inclination angle is θ2, wherein 1°≤θ1≤4°, and 1°≤θ2≤4°.

8. The rotor assembly of a disc motor according to claim 3, characterized in that: The dimensions R1 and R2 on the first inclined surface (131) meet the following conditions: 0.3 mm ≤ R1 ≤ 2 mm, 2 mm ≤ R2 ≤ 6 mm.

9. The rotor assembly of a disc motor according to claim 4, characterized in that: The dimensions HS1 and B1 of the second inclined surface (132) meet the following conditions: 1 mm ≤ HS1 ≤ 4 mm, 1 mm ≤ B1 ≤ 5 mm.

10. A disc-type motor, comprising a stator assembly and a rotor assembly, characterized in that: The rotor assembly is a rotor assembly of a disc motor as described in any one of claims 1 to 9.

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