Magnet structure used on lifting table driving motor
By setting cut angles at both ends of the inner arc surface of the magnet, the contradiction between reducing noise and improving efficiency of the lifting table motor is solved, and low-noise and high-efficiency motor performance is achieved.
Patent Information
- Application Number
- CN202422790627.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-15
- Publication Date
- 2025-10-17
- Estimated Expiration
- 2034-11-15
AI Technical Summary
The magnetic structure of the existing lifting table motor is difficult to strike a balance between reducing noise and improving efficiency, resulting in low efficiency of the motor at low noise and high noise at high efficiency.
Cutting angles are set at both ends of the inner arc surface of the magnet to make it tangent to the inner arc surface, and the size of the cutting angles is limited to ensure a more reasonable distribution of the air gap between the magnet and the rotor.
The motor improves efficiency while reducing noise, achieving a balance between low noise and high efficiency, with noise reduced to 46.2dB and efficiency reaching 51%.
Smart Images
Figure CN223450630U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to lift table motor field especially relates to a lift table drive motor on the use of magnet structure. BACKGROUND
[0002] The table plate of the lift table is driven by the motor and can be adjusted in height, the structure of the motor on the existing lift table comprises a shell, a stator is fixed on the inner wall of the shell, a rotor is arranged on the inner side of the stator and rotationally connected with the shell, the diameter of the rotor is 29mm, the stator is two arc-shaped magnets, the two magnets are respectively located on the two sides of the rotor, the inner and outer sides of the magnet are arc surfaces, the two ends of the magnet are respectively provided with a first side wall and a second side wall, the end of the outer arc surface is sequentially connected with the end of the inner arc surface through the corresponding first side wall and second side wall, the two first side walls on the magnet are parallel to each other, the two second side walls on the magnet are located on the same plane, and the first side wall is perpendicular to the second side wall.
[0003] According to the cross-sectional shape of the magnet, the motor can be divided into two types: Figure 5 As shown in the first type of magnet, the magnet has a gradually changing thickness, the two sides of the magnet are thin and the middle part is thick, that is, the outer arc surface of the magnet is coaxial with the rotor, and the inner arc surface is not coaxial with the rotor, so that the air gap between the magnet and the rotor is gradually opened, that is, the air gap between the middle part of the magnet and the rotor is narrow, about 0.5mm, and the air gap between the two ends of the magnet and the rotor gradually increases, about 1.9mm. The advantage of this arrangement is based on the law of air flow disturbance by the rotor inside the motor, which can reduce the noise of the motor during rotation, and the measurement at 30cm is 46.1dB, but due to the gradually opened cooperation between the magnet and the rotor, the overall distance between the magnet and the rotor is large, and the motor efficiency is low, only 42%. Figure 7 As shown in the second type of magnet, the magnet has a uniform wall thickness structure, the inner and outer arc surfaces of the magnet are coaxial with the rotor, and the air gap between the magnet and the rotor is uniform in width. The advantage of this arrangement is that the overall distance between the magnet and the rotor can be kept small, about 0.5mm, and the motor efficiency can be high, up to 53%, but this will cause the air flow to be disturbed when the rotor rotates, that is, the motor rotation noise is large, up to 48.5dB. INVENTION CONTENTS
[0004] The utility model aims at providing a magnet structure for a lift table drive motor. The utility model has the advantages of low noise and high efficiency.
[0005] The utility model discloses a magnet structure for driving motor of lifting table, the inside and outside of magnet are all cambered surface, and both ends of magnet are equipped with first side wall and second side wall, and the end of outer cambered surface of magnet is connected the end of corresponding inner cambered surface through corresponding first side wall and second side wall in proper order, and two first side walls on magnet are parallel to each other, and two second side walls on magnet are located on the same plane, and first side wall is perpendicular to second side wall, and the inner and outer cambered surface of magnet is coaxial, and the second side wall and the inner cambered surface of magnet are equipped with the cutting angle between, and one side of cutting angle is tangent to the inner cambered surface of magnet, and the other side of cutting angle deviates the joint edge of second side wall and the inner cambered surface of magnet 0.2-0.5mm.
[0006] The diameter of the outer cambered surface of the magnet is 41mm, and the diameter of the inner cambered surface of the magnet is 30mm.
[0007] The distance between the second side wall and the distal end of the outer cambered surface of the magnet is 12.5mm.
[0008] The distance between the two first side walls is 35.5mm.
[0009] The first side wall and the second side wall are provided with a transition round corner.
[0010] The radius of the round corner is 1mm.
[0011] The upper and lower ends of the magnet are provided with chamfers, and the chamfers extend through the first side wall, the round corner, the second side wall and the inner cambered surface of the magnet.
[0012] The chamfer is 0.5*45°.
[0013] Compared with the prior art, the main improvement made on the basis of the existing magnet is that a cutting angle is arranged at both ends of the inner cambered surface of the magnet, the cutting angle is tangent to the inner cambered surface, and the size of the cutting angle is limited. After the above improvement, the noise of the motor is only 46.2dB, and the motor efficiency reaches 51%. Therefore, the utility model has the advantages of keeping the motor low noise and high efficiency. BRIEF DESCRIPTION OF DRAWINGS
[0014] Figure 1 is a cross-sectional schematic view of the embodiment.
[0015] Figure 2 is Figure 1 is an enlarged view at A.
[0016] Figure 3is a schematic diagram of the motor in the test example.
[0017] Figure 4 is a performance curve graph of the motor in the test example.
[0018] Figure 5 is a schematic diagram of the motor in Comparative Example 1.
[0019] Figure 6 is a performance curve graph of the motor in Comparative Example 1.
[0020] Figure 7 is a schematic diagram of the motor in Comparative Example 2.
[0021] Figure 8 is a performance curve graph of the motor in Comparative Example 2.
[0022] The reference signs in the drawing are: 1 - first side wall, 2 - second side wall, 3 - chamfer, 4 - fillet, 5 - round corner. DETAILED DESCRIPTION
[0023] The utility model will be further explained in connection with the drawings and examples, but it is not as the basis for limiting the utility model.
[0024] Example. A magnet structure used on a lifting table driving motor, as shown in Figure 1 and Figure 2 , the inner and outer sides of the magnet are arc surfaces, the inner and outer arc surfaces of the magnet are coaxial, the diameter of the outer arc surface is 41 mm, and the diameter of the inner arc surface of the magnet is 30 mm.
[0025] Both ends of the magnet are provided with a first side wall 1 and a second side wall 2, the end of the outer arc surface of the magnet is connected to the end of the corresponding inner arc surface in sequence through the corresponding first side wall 1 and second side wall 2, the two first side walls 1 on the magnet are parallel to each other, the two second side walls 2 on the magnet are located on the same plane, and the first side wall 1 is perpendicular to the second side wall 2.
[0026] The distance between the second side wall 2 and the distal end of the outer arc surface of the magnet is 12.5 mm, that is, the perpendicular distance between the second side wall 2 and the axis of the outer arc surface of the magnet is 8 mm. The distance between the two first side walls 1 is 35.5 mm.
[0027] A round corner 5 is arranged between the first side wall 1 and the second side wall 2 for transition, and the radius of the round corner 5 is 1 mm.
[0028] As shown in Figure 2 , a chamfer 3 is arranged between the second side wall 2 and the inner arc surface of the magnet, one side of the chamfer 3 is tangent to the inner arc surface of the magnet, and the other side of the chamfer 3 deviates from the joint edge between the second side wall 2 and the inner arc surface of the magnet by 0.2-0.5 mm, and 0.3 mm is selected in the example. The shaded part in 2 is the cutout part of the chamfer 3.
[0029] Test Example. As shown in Figure 3 The existing motor adopts two magnets in the embodiment, and the corresponding matching rotor diameter is 29 mm. The inner and outer arc surfaces of the rotor and the magnets are coaxial. Except for the position of the cut angle 3, the remaining air gap width is 0.5 mm.
[0030] Noise test: measured at a distance of 30 cm from the motor, the measured value is 46.2 dB.
[0031] Performance test: the motor performance curve shown in Figure 4 and the performance table shown in Table 1.
[0032]
[0033] Table 1
[0034] Comparative Example 1. As shown in Figure 5 The motor adopts the existing first magnet structure, as shown in Figure 5 The outer arc surface radius of the magnet is 20.5 mm, the inner arc surface radius is 18.35 mm, the center distance between the inner and outer arc surfaces is 3.35 mm, the corresponding matching rotor diameter is 29 mm, the rotor and the outer arc surface of the magnet are coaxial, and the minimum air gap of the rotor of the magnet is 0.5 mm.
[0035] Noise test: measured at a distance of 30 cm, the measured value is 46.1 dB.
[0036] Performance test: the motor performance curve shown in Figure 6 and the performance table shown in Table 2.
[0037]
[0038] Table 2
[0039] Comparative Example 2. As shown in Figure 7 The motor adopts the existing second magnet structure, the inner and outer arc surfaces of the magnet are coaxial, the outer arc surface radius is 20.5 mm, the corresponding matching rotor diameter is 29 mm, the rotor and the inner and outer arc surfaces of the magnet are coaxial, and the air gap with uniform width formed between the rotors of the magnet is 0.5 mm.
[0040] Noise test: measured at a distance of 30 cm, the measured value is 53 dB.
[0041] Performance test: the motor performance curve shown in Figure 8 and the performance table shown in Table 3.
[0042]
[0043] Table 3
[0044] The results of Table 4 were obtained from the test results of the test example and Comparative Examples 1 and 2.
[0045] Comparative Example 1 Comparative Example 2 Test Example Noise (dB) 46.1 48.5 46.2 Efficiency (%) 42 53 51
[0046] Table 4
[0047] As can be seen from Table 4, the motor of the test example has only a very small increase in noise compared to the motor of Comparative Example 1 and is much smaller than the motor of Comparative Example 2, having the advantage of low noise. The motor of the test example has a small decrease in efficiency compared to the motor of Comparative Example 2 and is much larger than the motor of Comparative Example 1, having the advantage of high motor efficiency.
Claims
1. A magnet structure for a lift table driving motor, wherein both inner and outer sides of the magnet are arcuate surfaces, a first side wall (1) and a second side wall (2) are provided at both ends of the magnet, the end of the outer arcuate surface of the magnet is connected to the end of the corresponding inner arcuate surface through the corresponding first side wall (1) and the second side wall (2) in sequence, the two first side walls (1) on the magnet are parallel to each other, the two second side walls (2) on the magnet are located on the same plane, and the first side wall (1) is perpendicular to the second side wall (2), and the characteristics are: The inner and outer arc surfaces of the magnet are coaxial, and a cut angle (3) is provided between the second side wall (2) and the inner arc surface of the magnet, one side of the cut angle (3) is tangent to the inner arc surface of the magnet, and the other side of the cut angle (3) deviates from the connecting edge of the second side wall (2) and the inner arc surface of the magnet by 0.2-0.5 mm.
2. The magnet structure for the lift table drive motor according to claim 1, characterized in that: The diameter of the outer arc surface of the magnet is 41 mm, and the diameter of the inner arc surface of the magnet is 30 mm.
3. The magnet structure for the lift table drive motor according to claim 2, characterized in that: The distance between the second side wall (2) and the far end of the outer arc surface of the magnet is 12.5 mm.
4. The magnet structure for a lift table drive motor according to claim 1, characterized in that: The distance between the two first side walls (1) is 35.5 mm.
5. The magnet structure for the lift table drive motor according to claim 1, characterized in that: A transitional rounded corner (5) is provided between the first side wall (1) and the second side wall (2).
6. The magnet structure for the lift table drive motor according to claim 5, characterized in that: The radius of the fillet (5) is 1 mm.
7. The magnet structure for the driving motor of a lifting table according to claim 5, characterized in that: The upper and lower ends of the magnet are both provided with chamfers (4), and the chamfers (4) extend through the first side wall (1), the rounded corner (5), the second side wall (2) and the inner arc surface of the magnet.
8. The magnet structure for the lift table drive motor according to claim 7, characterized in that: The chamfer (4) is 0.5*45°.