Structure for reducing vibration noise of motor and motor

Abstract

The utility model discloses a structure for reducing motor vibration noise and a motor, the structure comprises a slot wedge, the front end of the slot wedge is thinner and forms a transition structure with the middle part, i.e., the cross section gradient of the front end of the slot wedge is gradually increased from the end part to the middle part to form a gradient, and the two sides of the front end of the slot wedge are provided with guide edges; the middle part of the slot wedge consists of a square part and a trapezoidal part, and the wider surface of the square part is connected with the upper bottom of the trapezoidal part into a whole; the tail part of the slot wedge is thicker, the front part of the tail part of the slot wedge and the middle part of the slot wedge are connected into a whole and are consistent in thickness, and the rear part of the tail part of the slot wedge is thicker. The slot wedge is arranged between stator tooth crests, is fixed at a position outside a stator, and is made of a non-magnetic material. According to the method, the stress deformation of the tooth part can be conducted to the position outside the stator through the slot wedge, so that the rigidity of the tooth part is greatly improved, the vibration of the tooth part is effectively reduced, and the vibration and noise reduction of the motor is realized.

Description

Technical Field

[0001] The utility model relates to the field of motors, and more particularly to a structure for reducing motor vibration noise and a motor. Background Art

[0002] Motors are common rotating electrical equipment. Examples include drive motors in new energy vehicles, fans in household appliances, and wind turbines. However, during operation, the motor's rotational nature inevitably causes significant vibration, which can negatively impact motor reliability and user experience. For example, vibration generates noise, which can be uncomfortable for users. It can also cause various connections and fastening structures to loosen and wear, shortening the motor's lifespan.

[0003] A common motor structure is an inner rotor structure, consisting of a motor housing, end caps, stator, and rotor. The stator body is typically formed by laminating silicon steel sheets. One of these sheets, called a punching, is an annular structure. Each punching is provided with slots for accommodating and securing the windings.

[0004] When a motor is running, the stator generates a rotating magnetic field, and the rotor rotates by generating electromagnetic torque through the electromagnetic interaction with the stator. However, due to the open structure of the tooth slots, the distribution of the air gap magnetic flux is distorted, which causes pulsation of the rotating electromagnetic force. Furthermore, the cantilever-like structure of the teeth results in poor rigidity, and the electromagnetic force is concentrated at the top of the teeth. Therefore, during the motor's rotation, the vibration amplitude at the top of the teeth is often the greatest.

[0005] Common methods for reducing motor vibration and noise include using magnetic slot wedges, varying stator slot shapes, tooth opening sizes, and slot-pole alignment to reduce vibration and noise. While magnetic slot wedges can reduce airgap flux distortion and thus vibration and noise, they can also cause magnetic flux leakage, which reduces motor efficiency and is therefore generally not adopted. Combining stator slots and rotor slot poles, segmented core designs, and skewing stator slots or rotor poles can reduce torque ripple and motor vibration and noise, but these structures are difficult to manufacture and increase processing costs. Reducing tooth opening size can reduce airgap flux distortion, but reducing slot openings increases winding placement and reduces slot fill factor, leading to reduced motor performance. Skewed or asymmetric pole combinations can also suppress torque ripple and reduce motor vibration and noise, but the uneven structure disrupts the periodicity of the motor's magnetic field, generating unbalanced magnetic pull. While this reduces overall torque ripple, it does not improve local stress conditions, making it difficult to achieve optimal results. If the strength of the motor teeth, which are subjected to the greatest force and deform the most, can be directly increased and the vibration of the motor teeth can be reduced, it will have an excellent effect on suppressing the vibration during the operation of the motor. Utility Model Content

[0006] This utility model proposes a slot wedge and motor structure that can reduce vibration in motor stator teeth. The slot wedge is installed between stator tooth tips and fixed outside the stator. It is made of non-magnetic material. This method transmits the stress and deformation of the teeth to a location outside the stator through the slot wedge, greatly improving the rigidity of the teeth and effectively reducing tooth vibration, thereby achieving vibration and noise reduction in the motor.

[0007] The technical solution of this utility model is as follows:

[0008] The utility model provides a structure for reducing motor vibration noise, including slot wedges,

[0009] The front end of the slot wedge is thinner and forms a transition structure with the middle part, that is, the cross-section of the front end of the slot wedge increases gradually from the end to the middle, forming a slope, and guide edges are provided on both sides of the front end of the slot wedge;

[0010] The middle portion of the slot wedge is composed of a square portion and a trapezoidal portion, and the wider side of the square portion is integrally connected to the upper bottom of the trapezoidal portion;

[0011] The tail of the slot wedge is relatively thick, the front part of the tail of the slot wedge is connected to the middle part of the slot wedge and has the same thickness, and the rear part of the tail of the slot wedge is relatively thick.

[0012] The rear part of the tail of the slot wedge is designed with an inclined surface, the lower part of the inclined surface is connected to the front part as a whole, and the upper part of the inclined surface is a large connecting head.

[0013] The top of the front end of the slot wedge is a small connecting head.

[0014] The slot wedge is an integrally formed structure.

[0015] A limiting step is provided at the connection between the front part of the tail of the slot wedge and the middle part of the slot wedge, which can be used for limiting on the stator.

[0016] Another aspect of the present invention provides a motor comprising a plurality of slot wedges, a stator, and a rotor, wherein the slot wedges are evenly distributed between corresponding stator tooth tops, and the middle portion of each slot wedge is mated with the corresponding stator slot tooth top, that is, the square portion of the middle portion of the slot wedge is consistent with the shape of the stator slot top opening, and the side surface of the trapezoidal portion of the middle portion of the slot wedge matches the inclined surface of the tooth shoe, so that the slot wedge can fit the stator tooth portion;

[0017] The front end cover of the output end of the motor has a first mounting hole that matches the tail of the slot wedge, and the bearing baffle at the tail of the motor has a second mounting hole that matches the front end of the slot wedge;

[0018] The diameter of the bearing baffle is larger than the inner diameter of the stator.

[0019] The reference circle size of the slot wedge mounting hole position on the front end cover and bearing baffle of the motor is larger than the installation reference circle diameter on the stator, so that the slot wedge is pressed toward the axis, so that the slot wedge can generate prestress on the tooth shoe at the top of the tooth.

[0020] The technical effects and advantages of this utility model are:

[0021] 1. The slot wedge and motor structure proposed in the present invention fix one end of the slot wedge to the motor end cover and the other end to the bearing baffle, so that the slot wedge can enhance the teeth of the motor, thereby effectively suppressing the vibration noise caused by the electromagnetic force of the teeth during the operation of the motor.

[0022] 2. The slot wedge proposed in the present invention can form a tight fit with the stator teeth. At the same time, due to its installation position outside the stator, its diameter is larger than the stator tooth top diameter, so that the slot wedge can provide axial prestressing on the stator teeth, which is conducive to the stator teeth and the slot wedge forming an integral whole, and better transmitting vibration to the slot wedge to reduce tooth vibration.

[0023] 3. The slot wedge proposed in the present invention can be used for guiding and limiting, and is easier to install than conventional slot wedges. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall slot wedge structure of the utility model;

[0025] Figure 2 is the plan view of the slot wedge;

[0026] Figure 3 for Figure 2 AA view;

[0027] Figure 4 is the motor schematic diagram;

[0028] Figure 5 This is a schematic diagram of the slot wedge and stator assembly;

[0029] Figure 6 Schematic diagram of the internal structure of the motor;

[0030] Figure 7 for Figure 6 BB schematic diagram;

[0031] Figure 8 for Figure 7 Enlarged view of point F in the middle;

[0032] Figure 9 、 Figure 10 It is a partial schematic diagram of the motor;

[0033] Figure 11 Schematic diagram of the front end cover structure;

[0034] Figure 12 Schematic diagram of the bearing baffle structure. DETAILED DESCRIPTION

[0035] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] Example 1

[0037] like Figures 1 to 3 As shown, this embodiment provides a structure for reducing motor vibration noise, including a slot wedge 1,

[0038] The front end 11 of the slot wedge is thinner and forms a transition structure with the middle part, that is, the cross-section of the front end of the slot wedge increases gradually from the end to the middle, forming a slope. Guide edges 111 are provided on both sides of the front end 11 of the slot wedge;

[0039] The middle portion 12 of the slot wedge is composed of a square portion 121 and a trapezoidal portion 122, wherein the wider side of the square portion is integrally connected to the upper base of the trapezoidal portion;

[0040] The tail portion 13 of the slot wedge is relatively thick, the front portion 131 of the tail portion of the slot wedge is integrally connected with the middle portion 12 of the slot wedge and has the same thickness, and the rear portion 132 of the tail portion of the slot wedge is relatively thick.

[0041] Furthermore, a slope a is designed on the surface of the rear portion 132 of the tail of the slot wedge, the lower portion of the slope is connected to the front portion 131 as a whole, and the upper portion of the slope is a large connecting head 133.

[0042] Furthermore, the top of the front end of the slot wedge is a small connector 112 .

[0043] Furthermore, the slot wedge is an integrally formed structure.

[0044] Furthermore, a limiting step 134 is provided at the connection between the front portion 131 of the tail of the slot wedge and the middle portion 12 of the slot wedge, which can be used for limiting the position on the stator.

[0045] Implementation Column 2

[0046] like Figures 4 to 12 As shown, this embodiment provides a motor, including multiple slot wedges 1, a stator 2, and a rotor 3. The slot wedges are evenly distributed between the corresponding stator tooth tops 21. The middle portion of each slot wedge 1 is matched with the corresponding stator slot tooth top. That is, the square portion 121 of the middle portion 12 of the slot wedge is consistent with the shape of the stator slot top opening, and the side surface of the trapezoidal portion 122 of the middle portion of the slot wedge matches the inclined surface of the tooth shoe 22, so that the slot wedge can fit the stator tooth portion.

[0047] The front end cover 23 of the output end of the motor 2 has a first mounting hole 24 that matches the tail of the slot wedge, and the bearing baffle 25 at the tail of the motor has a second mounting hole 26 that matches the front end of the slot wedge.

[0048] Furthermore, the diameter of the bearing baffle is larger than the inner diameter of the stator.

[0049] Furthermore, the reference circle size of the slot wedge mounting hole position on the front end cover and the bearing baffle of the motor is larger than the installation reference circle diameter on the stator, so that the slot wedge is pressed toward the axis, thereby enabling the slot wedge to generate prestress on the tooth boot at the top of the tooth.

[0050] Example 3

[0051] Installation method: The thicker part of the slot wedge is first installed in the slot hole of the motor end cover, then inserted into the stator slot, and finally installed in the bearing baffle. Since the front end is small and has a guide structure, it is very easy to install.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A structure for reducing motor vibration noise, characterized in that: Including slot wedges, The front end of the slot wedge is thinner and forms a transition structure with the middle part, that is, the cross-section of the front end of the slot wedge increases gradually from the end to the middle, forming a slope, and guide edges are provided on both sides of the front end of the slot wedge; The middle portion of the slot wedge is composed of a square portion and a trapezoidal portion, and the wider side of the square portion is integrally connected to the upper base of the trapezoidal portion; The tail of the slot wedge is relatively thick, the front part of the tail of the slot wedge is connected to the middle part of the slot wedge and has the same thickness, and the rear part of the tail of the slot wedge is relatively thick.

2. The structure for reducing motor vibration noise according to claim 1, characterized in that: The rear part of the tail of the slot wedge is designed with an inclined surface, the lower part of the inclined surface is connected to the front part as a whole, and the upper part of the inclined surface is a large connecting head.

3. The structure for reducing motor vibration noise according to claim 1, characterized in that: The top of the front end of the slot wedge is a small connecting head.

4. The structure for reducing motor vibration noise according to claim 1, characterized in that: The slot wedge is an integrally formed structure.

5. The structure for reducing motor vibration noise according to claim 1, characterized in that: A limiting step is provided at the connection between the front part of the tail of the slot wedge and the middle part of the slot wedge, which can be used for limiting the position on the stator.

6. A motor, characterized in that: A device comprising a plurality of slot wedges according to any one of claims 1 to 4, and further comprising a stator and a rotor, wherein the slot wedges are uniformly distributed between corresponding stator tooth tops, and the middle portion of each slot wedge is mated with the corresponding stator slot tooth top, i.e., the square portion in the middle of the slot wedge is consistent with the shape of the stator slot top opening, and the side surface of the trapezoidal portion in the middle of the slot wedge matches the inclined surface of the tooth shoe, so that the slot wedge can fit the stator tooth portion; The front end cover of the output end of the motor is provided with a first mounting hole that matches the tail of the slot wedge, and the bearing baffle at the tail of the motor is provided with a second mounting hole that matches the front end of the slot wedge.

7. The motor according to claim 6, characterized in that: The diameter of the bearing baffle is larger than the inner diameter of the stator.

8. The motor according to claim 6, characterized in that: The reference circle size of the slot wedge mounting hole position on the front end cover and bearing baffle of the motor is larger than the installation reference circle diameter on the stator, so that the slot wedge is pressed toward the axis, so that the slot wedge can generate prestress on the tooth shoe at the top of the tooth.

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