Rotor assembly and high speed motor having the same

Abstract

The utility model provides a rotor assembly and high -speed motor of application thereof, this rotor assembly includes the pivot, the magnetic ring and bearing of sleeve on pivot, wherein, the magnetic ring, bearing all are fixedly connected with pivot, be equipped with knurl on the pivot, the depth of knurl is h, 0.02mm=h=0.05mm. The noise and vibration level of high -speed motor of application this rotor assembly is smaller in the high -speed operation process.

Description

Technical Field

[0001] This utility model relates to the field of electric motors, and more particularly to a rotor assembly and a high-speed motor having the same. Background Technology

[0002] Motors are an essential component in personal care products such as hair dryers and combs. The performance, size, cost, weight, and lifespan of a motor can affect the performance, size, cost, weight, and lifespan of the products in which it is used.

[0003] Furthermore, a motor generally includes a stator assembly and a rotor assembly. The rotor assembly includes a shaft, a magnetic ring mounted on the shaft, and bearings. The assembly and fitting precision of the shaft, magnetic ring, and bearings will affect the overall performance of the motor. For example, when the motor speed is high, it will bring greater noise and vibration. Utility Model Content

[0004] This utility model provides a rotor assembly and a high-speed motor having the same. By improving the structure and assembly of the rotor assembly, the strength and reliability of the fit between the shaft and the magnetic ring, and between the shaft and the bearing, as well as the concentricity of the magnetic ring and the bearing are improved, thereby enabling the motor to achieve high speed while reducing the noise and vibration levels of the motor.

[0005] A rotor assembly includes a shaft, a magnetic ring fitted on the shaft, and a bearing. Both the magnetic ring and the bearing are fixedly connected to the shaft. The shaft has knurled surfaces with a depth h, where 0.02 mm ≤ h ≤ 0.05 mm. The advantage of this knurling is that it absorbs some high-frequency vibration energy, reducing noise and vibration levels during high-speed motor operation. If h is too small, the noise reduction and vibration damping effects will be poor; if h is too large, stress concentration will occur.

[0006] Preferably, the knurling is a textured knurling. The advantage is that the cross-textured structure of the textured knurling significantly increases the contact area and friction coefficient between the shaft and mating parts such as the magnetic ring and bearing, preventing micro-displacement during high-speed rotation, thereby further reducing the noise and vibration levels of the motor during high-speed operation. Simultaneously, when the shaft is fixedly connected to the bearing and / or magnetic ring using adhesive, the textured knurling avoids stress concentration caused by insufficient adhesive uniformity, helping to maintain a uniform gap between the magnetic ring / bearing and the shaft, and ensuring consistent adhesive filling.

[0007] Preferably, the magnetic ring includes a first inner hole, through which the rotating shaft passes. A first gap d exists between the first inner hole and the rotating shaft. This first gap is used to fill adhesive to fix the magnetic ring and the rotating shaft, with a value of 0.001mm ≤ d ≤ 0.006mm. The advantage is that after the rotating shaft is knurled, the adhesive can fill the groove, resulting in good bonding strength and high bonding reliability between the magnetic ring and the rotating shaft, ensuring reliable bonding and fixation. If the gap is too small, the adhesive will be squeezed out during installation, leading to unreliable and unstable bonding. If the gap is too large, it will complicate the processing and also lead to unreliable and unstable bonding.

[0008] Preferably, the bearing includes a second inner hole through which the rotating shaft passes, and a second gap d1 between the second inner hole and the rotating shaft. The second gap is used to fill adhesive to fix the bearing and the rotating shaft, where d1=d. This ensures reliable bonding and fixation between the bearing and the rotating shaft. If the gap is too small, the adhesive will be squeezed out during installation, leading to unreliable and unstable bonding. If the gap is too large, it will complicate the processing and also lead to unreliable and unstable bonding. The advantage of d1=d is that it ensures the concentricity of the magnetic ring and the rotating shaft, allowing the motor to operate at higher speeds while maintaining very low noise and vibration. Simultaneously, both the magnetic ring and the bearing are fixedly connected to the rotating shaft with adhesive, ensuring that the positions of the magnetic ring and the rotating shaft, and the bearing and the rotating shaft, are in place during high-speed operation and long-term use, guaranteeing the concentricity of all three.

[0009] Preferably, the knurling covers the outer surface of the shaft. This has the advantage of absorbing some of the high-frequency vibration energy for shock absorption, while simultaneously increasing the effective heat dissipation area and improving heat dissipation.

[0010] A high-speed motor includes a stator assembly, a housing, and an impeller. The housing includes an outer cylinder and an inner cylinder, which are connected by diffuser blades. The impeller is disposed at one end of a rotating shaft. A magnetic ring extends into the stator assembly. The motor also includes any of the rotor assemblies described above. The advantage is that motors using the aforementioned rotor assemblies exhibit low noise and vibration levels during high-speed rotation.

[0011] Preferably, the inner cylinder includes a first chamber for fixing the stator assembly, and a heat dissipation gap exists between the lower end of the stator assembly and the bottom wall of the first chamber. The advantage is that the heat dissipation gap allows for heat dissipation of the stator assembly, extending the motor's lifespan.

[0012] Preferably, the bearing includes a first bearing and a second bearing, with the first bearing and the second bearing respectively located on both sides of the magnetic ring. The rotor assembly further includes a first spring and a second spring. The first spring is located between the first bearing and the magnetic ring, with one end of the first spring abutting against the first bearing and the other end abutting against the magnetic ring. The second spring is located between the second bearing and the magnetic ring, with one end of the second spring abutting against the second bearing and the other end abutting against the magnetic ring.

[0013] The second spring is fixedly fitted to the rotating shaft;

[0014] The first spring includes a first section fixed to the rotating shaft and a second section capable of displacement along the length direction of the rotating shaft. One end of the second section abuts against the first bearing, one end of the first section abuts against the magnetic ring, and the other end of the second section is connected to the other end of the first section.

[0015] The advantage is that by replacing the traditional positioning sleeve with a first spring and a second spring, a lighter rotor assembly can be obtained; the first spring includes a first section that functions as a traditional positioning sleeve and a second section for correction, reducing processes, reducing weight, and facilitating the starting of high-speed motors.

[0016] Preferably, the housing includes a first bearing chamber for mounting the first bearing and a second bearing chamber for mounting the second bearing. The first bearing chamber is located above the stator assembly, and the second bearing chamber is located below the stator assembly. The first bearing chamber and the second bearing chamber are integrally disposed on the housing. This improves the concentricity of the motor assembly and reduces noise and vibration.

[0017] Preferably, the motor is a three-phase motor, and the motor further includes a PCB board, which is located above and in close contact with the first bearing housing, with a gap between the PCB board and the first bearing. This has the advantage of shortening the motor length while providing heat dissipation space using the gap. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of a rotor assembly described in this utility model.

[0019] Figure 2 This is a schematic diagram of the structure of a rotating shaft according to the present invention.

[0020] Figure 3 This is a cross-sectional view of a rotor assembly described in this utility model.

[0021] Figure 4 This is a schematic diagram of another rotor assembly described in this utility model.

[0022] Figure 5 This is a schematic diagram of the overall structure of the motor described in this utility model.

[0023] Figure 6 This is a cross-sectional view of the motor described in this utility model.

[0024] The names of the components shown in the diagram are as follows:

[0025] 1. Shaft; 2. Magnetic ring; 3. Bearing; 301. First bearing; 302. Second bearing; 4. Stator assembly; 5. Housing; 501. Outer cylinder; 502. Inner cylinder; 503. Diffuser blade; 6. PCB board; 7. Impeller; 8. First chamber; 9. First bearing chamber; 10. Second bearing chamber; 11. First spring; 1101. First section; 1102. Second section; 12. Second spring. Detailed Implementation

[0026] The present invention will now be described in detail through specific embodiments. Example 1:

[0027] like Figure 1-3 As shown, a rotor assembly includes a shaft 1, a magnetic ring 2 sleeved on the shaft 1, and a bearing 3. Both the magnetic ring 2 and the bearing 3 are fixedly connected to the shaft 1. The shaft 1 has knurled surfaces with a depth of h, where 0.02 mm ≤ h ≤ 0.05 mm. The knurled texture absorbs some high-frequency vibration energy, reducing noise and vibration levels during high-speed motor operation. If h is too small, the effect will be poor; if h is too large, stress concentration will occur.

[0028] In this example, the magnetic ring 2, bearing 3 and shaft 1 are fixedly connected by glue. The advantage is that after the shaft 1 is knurled, the glue can fill the groove, which makes the bonding strength between the magnetic ring 2 and shaft 1, and between the bearing 3 and shaft 1, good and reliable. This ensures that the magnetic ring 2 and shaft 1, and the bearing 3 and shaft 1 are in the correct position during high-speed operation and long-term use of the motor, and guarantees the concentricity of the three.

[0029] like Figure 2 As shown, the knurling is a textured knurling. The advantage of this is that the cross-textured structure of the textured knurling can significantly increase the contact area and friction coefficient between the rotating shaft 1 and mating parts such as the magnetic ring 2 and bearing 3, preventing micro-displacement during high-speed rotation, thereby further reducing the noise and vibration level of the motor during high-speed operation. At the same time, the textured knurling can avoid stress concentration caused by insufficient uniformity of the adhesive layer, which helps to maintain a uniform gap between the magnetic ring 2 / bearing 3 and the rotating shaft 1, ensuring consistent adhesive filling.

[0030] The magnetic ring 2 includes a first inner hole through which the rotating shaft 1 passes. A first gap, d, exists between the first inner hole and the rotating shaft 1. This first gap is used to fill adhesive to fix the magnetic ring 2 and the rotating shaft 1, with a value of 0.001mm ≤ d ≤ 0.006mm. This ensures reliable bonding and fixation between the magnetic ring 2 and the rotating shaft 1. If the gap is too small, adhesive will be squeezed out during installation, leading to unreliable and unstable bonding. If the gap is too large, it complicates the manufacturing process and also results in unreliable and unstable bonding.

[0031] The bearing 3 includes a second inner hole through which the rotating shaft 1 passes. A second gap, d1, exists between the second inner hole and the rotating shaft 1. This gap is used to fill adhesive to fix the bearing 3 and the rotating shaft 1, where d1 = d. This ensures reliable bonding and fixation between the bearing 3 and the rotating shaft 1. If the gap is too small, the adhesive will be squeezed out during installation, leading to unreliable and unstable bonding. If the gap is too large, it will complicate the manufacturing process and also result in unreliable and unstable bonding. The advantage of d1 = d is that it ensures the concentricity of the magnetic ring 2 and the rotating shaft 1, allowing the motor to operate at higher speeds while maintaining very low noise and vibration.

[0032] like Figure 2 As shown, the knurling covers the outer surface of the rotating shaft 1. The advantage is that it absorbs some of the high-frequency vibration energy for shock absorption, while simultaneously increasing the effective heat dissipation area and improving heat dissipation.

[0033] Understandably, in this example, bearing 3 and shaft 1 can be fixedly connected in other ways, such as by using a silicone sleeve for flexible connection. Example 2:

[0034] In this example, the bearing 3 includes a first bearing 301 and a second bearing 302, as follows: Figure 1 As shown, the first bearing 301 and the second bearing 302 are disposed on one side of the magnetic ring 2, and the second spring 12 is disposed between the first bearing 301 and the second bearing 302.

[0035] Another example, such as Figure 4As shown, the first bearing 301 and the second bearing 302 are respectively provided on both sides of the magnetic ring 2. The rotor assembly also includes a first spring 11 and a second spring 12. The first spring 11 is located between the first bearing 301 and the magnetic ring 2, with one end of the first spring 11 abutting against the first bearing 301 and the other end abutting against the magnetic ring 2. The second spring 12 is located between the second bearing 302 and the magnetic ring 2, with one end of the second spring 12 abutting against the second bearing 302 and the other end abutting against the magnetic ring 2. The second spring 12 is fixedly engaged with the rotating shaft 1. The first spring 11 includes a first section 1101 fixed to the rotating shaft 1 and a second section 1102 capable of displacement along the length direction of the rotating shaft 1. One end of the second section 1102 abuts against the first bearing 301, one end of the first section 1101 abuts against the magnetic ring 2, and the other end of the second section 1102 is connected to the other end of the first section 1101. The advantage is that by replacing the traditional positioning sleeve with the first spring 11 and the second spring 12, a lighter rotor assembly is obtained; the first spring 11 includes a first section 1101 that functions as a traditional positioning sleeve and a second section 1102 for correction, reducing processes, reducing weight, and facilitating the starting of high-speed motors. Example 3:

[0036] This embodiment provides a high-speed motor that uses the rotor assembly from Embodiment 1 or Embodiment 2. For example... Figure 5 As shown, a high-speed motor includes a stator assembly 4, a housing 5, and an impeller 7. The housing 5 includes an outer cylinder 501 and an inner cylinder 502, which are connected by diffuser blades 503. The impeller 7 is disposed at one end of the rotating shaft 1. A magnetic ring 2 extends into the stator assembly 4. The motor uses the rotor assembly described in Embodiment 1 or Embodiment 2. The advantage is that the motor using the aforementioned rotor assembly has low noise and vibration levels during high-speed rotation.

[0037] like Figure 6 As shown, the inner cylinder 502 includes a first chamber 8 for fixing the stator assembly 4, and a heat dissipation gap exists between the lower end of the stator assembly 4 and the bottom wall of the first chamber 8. The advantage is that the heat dissipation gap allows for heat dissipation of the stator assembly 4, extending the motor's lifespan.

[0038] Furthermore, such as Figure 6As shown, the housing 5 includes a first bearing chamber 9 for mounting the first bearing 301 and a second bearing chamber 10 for mounting the second bearing 302. The first bearing chamber 9 is located above the stator assembly 4, and the second bearing chamber 10 is located below the stator assembly 4. The first bearing chamber 9 and the second bearing chamber 10 are integrally disposed on the housing 5. This improves the concentricity of the motor assembly and reduces noise and vibration. In this case, the high-speed motor uses the rotor assembly of Embodiment 2. Understandably, both the first bearing chamber 9 and the second bearing chamber 10 are located below the stator assembly 4; in this case, the high-speed motor uses the rotor assembly of Embodiment 1.

[0039] The motor is a three-phase motor, and it also includes a PCB board 6. The PCB board 6 is located above and in close contact with the first bearing chamber 9, and there is a gap between the PCB board 6 and the first bearing 301. The advantage is that it shortens the length of the motor, while providing heat dissipation space using the gap.

[0040] The above embodiments only illustrate several implementation methods of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A rotor assembly, comprising a shaft, a magnetic ring sleeved on the shaft, and a bearing, characterized in that, The magnetic ring and the bearing are both fixedly connected to the rotating shaft. The rotating shaft is provided with knurling, and the knurling covers at least the positions of the bearing and the magnetic ring. The depth of the knurling is h, where 0.02mm≤h≤0.05mm.

2. The rotor assembly according to claim 1, characterized in that, The knurling is a mesh knurling.

3. The rotor assembly according to claim 1, characterized in that, The magnetic ring includes a first inner hole, through which the rotating shaft passes. A first gap d is formed between the first inner hole and the rotating shaft. The first gap is used to fill glue to fix the magnetic ring and the rotating shaft. The first gap is 0.001mm≤d≤0.006mm.

4. The rotor assembly according to claim 3, characterized in that, The bearing includes a second inner hole through which the rotating shaft passes, and a second gap d1 between the second inner hole and the rotating shaft. The second gap is used to fill glue to fix the bearing and the rotating shaft, and d1=d.

5. The rotor assembly according to claim 4, characterized in that, The knurling covers the outer surface of the shaft.

6. A high-speed motor, comprising a stator assembly, a housing, and an impeller, wherein the housing includes an outer cylinder and an inner cylinder, the outer cylinder and the inner cylinder are connected by diffuser blades, the impeller is disposed at one end of the rotating shaft, and a magnetic ring extends into the stator assembly, characterized in that, The motor further includes the rotor assembly as described in any one of claims 1-5.

7. The high-speed motor according to claim 6, characterized in that, The inner cylinder includes a first chamber for fixing the stator assembly, and there is a heat dissipation gap between the lower end of the stator assembly and the bottom wall of the first chamber.

8. The high-speed motor according to claim 6, characterized in that, The bearing includes a first bearing and a second bearing, with the first bearing and the second bearing respectively located on both sides of the magnetic ring. The rotor assembly also includes a first spring and a second spring, with the first spring located between the first bearing and the magnetic ring, and one end of the first spring abutting against the first bearing and the other end abutting against the magnetic ring. The second spring is located between the second bearing and the magnetic ring, with one end of the second spring abutting against the second bearing and the other end abutting against the magnetic ring; The second spring is fixedly fitted to the rotating shaft; The first spring includes a first section fixed to the rotating shaft and a second section capable of displacement along the length direction of the rotating shaft. One end of the second section abuts against the first bearing, one end of the first section abuts against the magnetic ring, and the other end of the second section is connected to the other end of the first section.

9. The high-speed motor according to claim 8, characterized in that, The housing includes a first bearing chamber for mounting the first bearing and a second bearing chamber for mounting the second bearing. The first bearing chamber is located above the stator assembly, and the second bearing chamber is located below the stator assembly. The first bearing chamber and the second bearing chamber are integrally disposed on the housing.

10. The high-speed motor according to claim 9, characterized in that, The motor is a three-phase motor, and the motor also includes a PCB board. The PCB board is located above the first bearing chamber and is closely attached to the first bearing chamber, and there is a gap between the PCB board and the first bearing.

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