A vibration-damping, noise-reducing, and anti-slip motor stator structure and a permanent magnet motor
By using a closed stator tooth inner circle and keyway fit structure, combined with a damping and vibration reduction layer, the vibration noise and slippage problems of traditional permanent magnet motors are solved, achieving the motor's vibration reduction, noise reduction and anti-slippage effects.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHUNENG AUTOMOBILE CO LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-05-26
AI Technical Summary
The interference fit between the stator and the housing of a traditional permanent magnet motor leads to high vibration and noise. Stator slippage or housing deformation affects motor performance, and the cogging torque caused by the inner circular slot of the stator increases vibration and noise.
The stator tooth section adopts a closed inner circle structure, combined with the keyway fit between the motor housing and the stator yoke and stator teeth. The keyway gap is filled with a damping layer, and vibration and noise are reduced through interference fit and damping material.
It effectively prevents stator slippage, reduces motor vibration and noise, improves the precise positioning capability between the stator and the housing, reduces eddy current losses, and extends the service life of the motor.
Smart Images
Figure CN224289398U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of permanent magnet motor technology, and in particular to a motor stator structure for vibration reduction, noise reduction and anti-slip, and a permanent magnet motor. Background Technology
[0002] The stator and housing structure of a traditional permanent magnet motor is as follows: Figure 1 As shown, during normal operation, the rotor and stator magnetic fields interact to generate electromagnetic force. This electromagnetic force acts on the stator teeth, causing the stator to vibrate. Because traditional permanent magnet motors assemble the stator and housing using an interference fit, the stator vibration is directly transmitted to the motor housing, resulting in significant vibration noise. Furthermore, if the interference fit between the stator and motor housing is too small, the tangential electromagnetic force generated by the motor can cause stator slippage, easily leading to motor damage. Conversely, if the interference fit is too large, it can easily cause deformation of the motor housing or stator, affecting motor performance.
[0003] Traditional permanent magnet motors have slots cut into the inner circle of the stator, and the winding frame is then embedded into these slots. During motor operation, the slots in the inner circle of the stator generate cogging torque, increasing speed fluctuations, vibration, and noise, thus affecting motor performance. Patent CN111355315B proposes a stator design consisting of two parts: a stator tooth section and a stator yoke section. The inner circle of the stator tooth section is designed as a closed slot, and the winding frame is embedded into the slot through the outer circle of the stator tooth section. The stator tooth section and the stator yoke section are fixed together by a threaded connection. However, this threaded connection requires the stator to be a single, integrated block structure to machine the threads onto its surface. To reduce eddy current losses and lower costs, the current market primarily uses laminated silicon steel sheets to form the stator, thus this solution also has limitations.
[0004] Therefore, it is essential to provide a motor stator structure and permanent magnet motor with vibration reduction, noise reduction and anti-slip, in which the slots on the inner circle of the stator teeth are closed slotless structures, making the air gap magnetic field between the stator and rotor more uniform and reducing motor vibration and noise. Utility Model Content
[0005] In view of this, this utility model proposes a vibration-damping, noise-reducing, and anti-slip motor stator structure and permanent magnet motor that can effectively eliminate stator slippage and operating noise.
[0006] On the one hand, this utility model provides a motor stator structure for vibration reduction, noise reduction, and anti-slip, comprising:
[0007] Motor housing, the motor housing having a hollow first cavity inside;
[0008] The stator yoke is disposed in the first cavity and abuts against the inner surface of the motor housing; the stator yoke has a hollow second cavity inside.
[0009] The stator teeth are disposed in the second cavity and abut against the inner surface of the stator yoke. The stator teeth are provided with several notches for mounting the windings.
[0010] The motor housing and the stator yoke are provided with a plurality of first anti-rotation units; the stator yoke and the stator teeth are provided with a plurality of second anti-rotation units, and the plurality of first anti-rotation units and the plurality of second anti-rotation units prevent the stator yoke or the stator teeth from rotating relative to the motor housing.
[0011] Based on the above technical solutions, preferably, the first anti-rotation unit includes a plurality of first grooves and a plurality of first positioning keys. The plurality of first grooves are spaced apart on the outer surface of the stator yoke and extend along the axial direction of the stator yoke. The plurality of first positioning keys are spaced apart on the inner surface of the motor housing and extend along the axial extension direction of the motor housing and the radial direction of the stator yoke, respectively. The plurality of first positioning keys and the plurality of first grooves are configured to cooperate one-to-one.
[0012] Preferably, a plurality of first grooves and a plurality of first positioning keys are interference-fitted, the radial depth of the plurality of first grooves is greater than the radial thickness of the plurality of first positioning keys, and the gaps between the plurality of first grooves and the plurality of first positioning keys are filled with a first damping layer.
[0013] More preferably, the central angle of the opening of the first groove is 10° to 15°, the thickness of the stator yoke is H1, the depth of the first groove in the radial direction is L1, and 0.6H1≤L1≤0.8H1.
[0014] More preferably, the thickness of the first damping layer in the radial direction is h1, and the thickness of the plurality of first positioning keys in the radial direction is h2, 0.5L1≤h1≤0.7L1, L1=h1+h2.
[0015] More preferably, the second anti-rotation unit includes a plurality of second slots and a plurality of second positioning keys. The plurality of second slots are spaced apart on the outer surface of the stator teeth between adjacent notches and extend along the axial extension direction of the stator teeth. The plurality of second positioning keys are disposed on the inner surface of the stator yoke and extend along the axial extension direction and the radial extension direction of the stator yoke, respectively. The plurality of second slots and the plurality of second positioning keys are configured to cooperate in a one-to-one correspondence.
[0016] More preferably, a plurality of second grooves and a plurality of second positioning keys are provided in a transitional fit, the radial depth of the plurality of second grooves is greater than the radial thickness of the plurality of second positioning keys, and the gaps between the plurality of second grooves and the plurality of second positioning keys are all filled with a second damping layer.
[0017] In a further preferred embodiment, the chord lengths of the plurality of second positioning keys and the plurality of second grooves on the outer surface of the stator teeth are all S2, the chord lengths of the regions between adjacent notches on the outer surface of the stator teeth are S1, and S2 = 0.3S1; the thickness of the stator yoke is H2, and the depth of the plurality of second grooves in the radial direction is L2, 0.5H2≤L2≤0.6H2.
[0018] More preferably, the thickness of the second damping layer in the radial direction is h3, and the thickness of the plurality of second positioning keys in the radial direction is h4, 0.3L2≤h3≤0.5L2, L2=h3+h4.
[0019] On the other hand, this utility model also provides a permanent magnet motor, including the above-mentioned vibration-damping, noise-reducing, and anti-slip motor stator structure.
[0020] The present invention provides a vibration-damping, noise-reducing, and anti-slip motor stator structure, which has the following advantages compared to the prior art:
[0021] (1) The keyway fit structure between the motor housing and the stator yoke, and between the stator yoke and the stator teeth, can effectively prevent the stator from slipping in the axial or radial direction of the motor.
[0022] (2) The damping and vibration reduction layer further provided at each keyway connection can reduce the noise of motor vibration or the eddy current loss of the stator;
[0023] (3) The inner surface of the stator teeth is a closed structure, which helps to reduce the vibration and noise generated by the motor. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the stator and housing structure of a traditional permanent magnet motor.
[0026] Figure 2 This is a cross-sectional view of a motor stator structure for vibration reduction, noise reduction, and anti-slipping, and a permanent magnet motor according to the present invention.
[0027] Figure 3 This is a schematic diagram of the structure of a motor stator structure for vibration reduction, noise reduction, and anti-slip, and the first and second anti-rotation units of a permanent magnet motor according to the present invention.
[0028] Figure 4 This is a schematic diagram showing the dimensions of a motor stator structure for vibration reduction, noise reduction, and anti-slip, as well as the first and second anti-rotation units of a permanent magnet motor.
[0029] Reference numerals: 4. Stator teeth; 5. First damping layer; 6. Stator yoke; 7. Motor housing; 8. Winding; 9. Second damping layer; 10. First anti-rotation unit; 11. Second anti-rotation unit; 101. First slot; 102. First positioning key; 111. Second slot; 112. Second positioning key. Detailed Implementation
[0030] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of this utility model.
[0031] like Figure 2 As shown, on the one hand, this utility model provides a motor stator structure for vibration reduction, noise reduction, and anti-slip, comprising:
[0032] The motor housing 7 has a hollow first cavity inside; the motor housing 7 is used to provide support and protection for the internal structure, and also provides heat dissipation.
[0033] The stator yoke 6 is disposed in the first cavity and abuts against the inner surface of the motor housing 7. The stator yoke 6 has a hollow second cavity inside.
[0034] The stator tooth section 4 is disposed in the second cavity and abuts against the inner surface of the stator yoke section 6. The stator tooth section 4 is provided with several notches for installing the windings. The stator tooth section 4 and the stator yoke section 6 together form several winding slot structures for placing the windings 8.
[0035] The motor housing 7 and the stator yoke 6 are provided with a plurality of first anti-rotation units 10; the stator yoke 6 and the stator teeth 4 are provided with a plurality of second anti-rotation units 11. The first anti-rotation units 10 and the second anti-rotation units 11 prevent rotation of the stator yoke 6 or the stator teeth 4 relative to the motor housing 7. The first anti-rotation units 10 prevent relative movement between the motor housing 7 and the stator yoke 6, and the second anti-rotation units 11 prevent relative movement between the stator yoke 6 and the stator teeth 4. Overall, the inner edge of the stator teeth has a slotless structure, which can further reduce noise and vibration during motor operation.
[0036] like Figure 2 As shown, the first anti-rotation unit 10 includes a plurality of first grooves 101 and a plurality of first positioning keys 102. The plurality of first grooves 101 are spaced apart on the outer surface of the stator yoke 6 and extend along the axial direction of the stator yoke 6. The plurality of first positioning keys 102 are spaced apart on the inner surface of the motor housing 7 and extend along the axial direction of the motor housing 7 and the radial direction of the stator yoke 6, respectively. The plurality of first positioning keys 102 and the plurality of first grooves 101 are correspondingly engaged. The engagement of the first positioning keys 102 and the first grooves 101 achieves the anti-rotation function in the circumferential direction, ensuring that the stator yoke 6 will not shift or rotate.
[0037] A plurality of first grooves 101 and a plurality of first locating keys 102 are configured with an interference fit. The radial depth of the plurality of first grooves 101 is greater than the radial thickness of the plurality of first locating keys 102. The gaps between the plurality of first grooves 101 and the plurality of first locating keys 102 are all filled with a first damping layer 5. The first damping layer 5 can reduce the vibration of the stator yoke 6 relative to the motor housing 7. By absorbing the energy of mechanical vibration, vibration transmission is reduced, extending the service life of the motor and improving its operational stability. The interference fit allows the first grooves 101 and the first locating keys 102 to achieve optimal performance, improving the precise positioning capability between the stator yoke and the motor housing.
[0038] The central angle of the opening of the first groove 101 is 10° to 15°, the thickness of the stator yoke 6 is H1, the depth of the first groove 101 in the radial direction is L1, and 0.6H1≤L1≤0.8H1.
[0039] The thickness of the first damping layer 5 in the radial direction is h1, and the thickness of the plurality of first positioning keys 102 in the radial direction is h2, where 0.5L1≤h1≤0.7L1, and L1=h1+h2. By limiting the above dimensions, the fit structure can be optimized, and the positioning accuracy and vibration reduction effect can be improved.
[0040] Similarly, the second anti-rotation unit 11 includes a plurality of second grooves 111 and a plurality of second positioning keys 112. The plurality of second grooves 111 are spaced apart on the outer surface of the stator teeth 4 between adjacent notches and extend along the axial extension direction of the stator teeth 4. The plurality of second positioning keys 112 are disposed on the inner surface of the stator yoke 6 and extend along the axial extension direction and the radial extension direction of the stator yoke 6, respectively. The plurality of second grooves 111 and the plurality of second positioning keys 112 are configured to cooperate in a one-to-one correspondence.
[0041] A plurality of second grooves 111 and a plurality of second locating keys 112 are configured in a transitional fit. The radial depth of the plurality of second grooves 111 is greater than the radial thickness of the plurality of second locating keys 112. The gaps between the plurality of second grooves 111 and the plurality of second locating keys 112 are all filled with a second damping layer 9. The second damping layer 9 can reduce fatigue accumulation caused by vibration during long-term use and reduce component wear.
[0042] The chord lengths of the second locating keys 112 and the second grooves 111 on the outer surface of the stator teeth 4 are all S2, and the chord lengths of the areas between adjacent notches on the outer surface of the stator teeth 4 are S1, where S2 = 0.3S1. The thickness of the stator yoke 6 is H2, and the radial depth of the second grooves 111 is L2, where 0.5H2 ≤ L2 ≤ 0.6H2. The proportional design between the chord length S2 of the second locating keys 112 and the second grooves 111 on the outer surface of the stator teeth 4 and the chord length S1 between adjacent notches further optimizes the stress distribution of the components and improves the overall structural stability by reasonably distributing the load and vibration.
[0043] The thickness of the second damping layer 9 in the radial direction is h3, and the thickness of the several second positioning keys 112 in the radial direction is h4. 0.3L2≤h3≤0.5L2, L2=h3+h4. Similarly, the reasonable ratio between the thickness h3 and L2 of the second damping layer 9 ensures the damping effect without affecting the stability of the overall structure.
[0044] In this embodiment, the first damping layer 5 and the second damping layer 9 are made of rubber or similar damping materials such as damping pads.
[0045] On the other hand, this utility model also provides a permanent magnet motor, including the above-mentioned vibration-damping, noise-reducing, and anti-slip motor stator structure.
[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A motor stator structure for vibration reduction, noise reduction, and anti-slip operation, characterized in that, include: Motor housing, the motor housing having a hollow first cavity inside; The stator yoke is disposed in the first cavity and abuts against the inner surface of the motor housing; the stator yoke has a hollow second cavity inside. The stator teeth are disposed in the second cavity and abut against the inner surface of the stator yoke. The stator teeth are provided with several notches for mounting the windings. The motor housing and the stator yoke are provided with a plurality of first anti-rotation units; the stator yoke and the stator teeth are provided with a plurality of second anti-rotation units, and the plurality of first anti-rotation units and the plurality of second anti-rotation units prevent the stator yoke or the stator teeth from rotating relative to the motor housing.
2. The motor stator structure for vibration reduction, noise reduction, and anti-slip as described in claim 1, characterized in that, The first anti-rotation unit includes a plurality of first slots and a plurality of first positioning keys. The plurality of first slots are spaced apart on the outer surface of the stator yoke and extend along the axial direction of the stator yoke. The plurality of first positioning keys are spaced apart on the inner surface of the motor housing and extend along the axial extension direction of the motor housing and the radial direction of the stator yoke, respectively. The plurality of first positioning keys and the plurality of first slots are configured to cooperate one-to-one.
3. The motor stator structure for vibration reduction, noise reduction, and anti-slip as described in claim 2, characterized in that, A plurality of first grooves and a plurality of first positioning keys are configured with an interference fit, the radial depth of the plurality of first grooves is greater than the radial thickness of the plurality of first positioning keys, and the gaps between the plurality of first grooves and the plurality of first positioning keys are filled with a first damping layer.
4. The motor stator structure for vibration reduction, noise reduction, and anti-slip as described in claim 3, characterized in that, The central angle of the opening of the first groove is 10° to 15°, the thickness of the stator yoke is H1, the depth of the first groove in the radial direction is L1, and 0.6H1≤L1≤0.8H1.
5. The motor stator structure for vibration reduction, noise reduction, and anti-slip as described in claim 4, characterized in that, The thickness of the first damping layer in the radial direction is h1, and the thickness of the first positioning keys in the radial direction is h2. 0.5L1≤h1≤0.7L1, L1=h1+h2.
6. The motor stator structure for vibration reduction, noise reduction, and anti-slip as described in claim 3, characterized in that, The second anti-rotation unit includes a plurality of second slots and a plurality of second positioning keys. The plurality of second slots are spaced apart on the outer surface of the stator teeth between adjacent notches and extend along the axial extension direction of the stator teeth. The plurality of second positioning keys are disposed on the inner surface of the stator yoke and extend along the axial extension direction and the radial extension direction of the stator yoke, respectively. The plurality of second slots and the plurality of second positioning keys are configured to cooperate in a one-to-one correspondence.
7. The motor stator structure for vibration reduction, noise reduction, and anti-slip as described in claim 6, characterized in that, A plurality of second grooves and a plurality of second positioning keys are provided in a transitional fit, wherein the radial depth of the plurality of second grooves is greater than the radial thickness of the plurality of second positioning keys, and a second damping layer is filled in the gap between the plurality of second grooves and the plurality of second positioning keys.
8. The motor stator structure for vibration reduction, noise reduction, and anti-slip as described in claim 7, characterized in that, The chord lengths of the second positioning keys and the second grooves on the outer surface of the stator teeth are all S2, and the chord lengths of the areas between adjacent notches on the outer surface of the stator teeth are S1, S2=0.3S1; the thickness of the stator yoke is H2, and the depth of the second grooves in the radial direction is L2, 0.5H2≤L2≤0.6H2.
9. The motor stator structure for vibration reduction, noise reduction, and anti-slip as described in claim 8, characterized in that, The thickness of the second damping layer in the radial direction is h3, and the thickness of the second positioning keys in the radial direction is h4. 0.3L2≤h3≤0.5L2, L2=h3+h4.
10. A permanent magnet motor, characterized in that, The motor stator structure includes the vibration reduction, noise reduction, and anti-slip structure as described in any one of claims 1-9.