Motor with structure for reducing vibration noise of motor

Abstract

The invention discloses a motor with a structure for reducing vibration noise of the motor, which comprises a slot wedge, the front end of the slot wedge is thinner and forms a transition structure with the middle part, that is, 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 invention relates to the field of motors, and more particularly to a motor with a structure for reducing motor vibration noise. Background Art

[0002] Motors are a common type of rotating electrical equipment. For example, drive motors in new energy vehicles, fans in household appliances, wind turbines, etc. are all typical motor products. However, during the operation of the motor, its "rotational" characteristics will inevitably cause large vibrations, and vibrations will have a very negative impact on the reliability and user evaluation of the motor. For example, vibrations will produce noise, which will make users feel uncomfortable. Vibrations will also cause various connections and fastening structures to loosen and wear, resulting in a reduction in the life of the motor product.

[0003] The common motor structure is the inner rotor structure, which includes the motor housing, end cover, stator, rotor and other parts. The stator body of the motor is usually formed by laminating silicon steel sheets, one of which is called a punching sheet, which is a ring-shaped structure. At the same time, each punching sheet is provided with a slot-shaped structure for placing and fixing the winding.

[0004] When the motor is running, the stator generates a rotating magnetic field, and the rotor relies on the electromagnetic force interaction with the stator to generate electromagnetic torque to rotate the rotor. However, due to the open structure of the tooth slot, the distribution of the air gap magnetic flux is distorted, which causes the pulsation of the rotating electromagnetic force. In addition, due to the cantilever beam-like structure of the tooth part, its rigidity is poor, and the electromagnetic force is concentrated on the top of the tooth. Therefore, during the rotation of the motor, the vibration amplitude of the top of the tooth is often the largest.

[0005] At present, the commonly used methods for reducing vibration and noise of motors are: using magnetic slot wedges, different stator tooth slot shapes, tooth opening sizes, and matching methods between slot poles to reduce vibration and noise. Although the use of magnetic slot wedges can reduce the distortion of air gap magnetic density and thus reduce vibration and noise, magnetic slot wedges can cause magnetic leakage, which will reduce the efficiency of the motor and are usually not used. Although the combination of stator slots and rotor slot poles, segmented core design, and stator slot or rotor magnetic pole skewed pole structure can reduce torque pulsation and reduce motor vibration and noise, these structures are difficult to manufacture and increase processing costs. Reducing the size of the tooth opening can reduce the distortion of air gap magnetic density, but reducing the slot opening will increase the difficulty of winding placement, and reducing the slot full rate will lead to reduced motor performance. The use of skewed poles and asymmetric magnetic pole combinations can also suppress torque pulsation and reduce motor vibration and noise, but because the uneven structure destroys the periodicity of the motor magnetic field and generates unbalanced magnetic pull, although the overall torque pulsation of the motor is reduced, the local stress of the motor is not improved, and it is often difficult to achieve good results. If the strength of the motor teeth that 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. Summary of the invention

[0006] The purpose of the present invention is to propose a slot wedge and motor structure that can reduce the vibration of the stator teeth of the motor. The slot wedge is installed between the stator tooth tops and fixed at a position outside the stator. It uses non-magnetic materials. This method can transmit the force deformation of the tooth part to a position outside the stator through the slot wedge, greatly improving the rigidity of the tooth part, thereby effectively reducing the vibration of the tooth part, thereby achieving vibration reduction and noise reduction of the motor.

[0007] The technical solution of the present invention is as follows:

[0008] The present invention provides a structure for reducing motor vibration noise, comprising a slot wedge,

[0009] The front end of the slot wedge is thinner and forms a transition structure with the middle part, that is, the front end of the slot wedge has a cross-sectional gradient increasing from the end to the middle part to form a slope, and guide edges are provided on both sides of the front end of the slot wedge;

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

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

[0012] The rear part surface of the tail of the slot wedge is designed with an inclined surface, the lower part of the inclined surface is connected with 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 limited on the stator.

[0016] Another aspect of the present invention provides a motor with a structure for reducing motor vibration noise, 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 matched with the corresponding stator slot tooth top, that is, 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;

[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 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, so that the slot wedge can generate prestress on the tooth shoe at the top of the tooth.

[0020] Technical effects and advantages of the present invention:

[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 motor teeth, 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 close fit with the stator teeth. At the same time, due to the installation position outside the stator, its diameter is larger than the stator tooth top diameter, so that the slot wedge can provide axial prestress to the stator teeth, which is conducive to the stator teeth and the slot wedge forming a whole, and better transmitting vibration to the slot wedge to reduce the vibration of the tooth.

[0023] 3. The slot wedge proposed by 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 It is a schematic diagram of the overall slot wedge structure of the present invention;

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

[0026] Figure 3 for Figure 2 AA view;

[0027] Figure 4 is the schematic diagram of the motor;

[0028] Figure 5 It 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] Fig. 9 , Fig.10 It is a partial schematic diagram of the motor;

[0033] Fig.11 It is a schematic diagram of the front end cover structure;

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

[0035] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only 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 creative work are within the scope of protection of the present invention.

[0036] Embodiment 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 front end of the slot wedge has a cross-sectional gradient increasing from the end to the middle part to form a slope, and 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, and a wider side of the square portion is connected to the upper bottom 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 surface of the rear portion 132 of the tail of the slot wedge is designed with an inclined surface a, the lower portion of the inclined surface is connected to the front portion 131 as a whole, and the upper portion of the inclined surface is a large connector 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, so as to limit the position on the stator.

[0045] Implementation column 2

[0046] like Figures 4 to 12 As shown, this embodiment provides a motor with a structure for reducing motor vibration noise, 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, and the middle part of each slot wedge 1 is matched with the corresponding stator slot tooth top, that is, the square part 121 of the middle part 12 of the slot wedge is consistent with the shape of the stator slot top opening, and the side surface of the trapezoidal part 122 of the middle part of the slot wedge matches the inclined surface of the tooth shoe 22, so that the slot wedge can fit the stator tooth part;

[0047] The front end cover 23 of the output end of the motor 2 has a first mounting hole 24 that matches with 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 with 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 diameter of the mounting reference circle on the stator, so that the slot wedge is pressed toward the axis, thereby enabling the slot wedge to generate prestress on the tooth shoe at the top of the tooth.

[0050] Embodiment 3

[0051] Installation method: The thicker part of the slot wedge tail is first installed in the slot hole of the motor end cover, then inserted into the stator slot, and then installed in the bearing baffle. Because the front end is small and has a guiding 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 substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A motor having a structure for reducing motor vibration noise, characterized in that: It includes multiple slot wedges, stators, and rotors. The front end of the slot wedge is thinner and forms a transition structure with the middle part, that is, the front end of the slot wedge has a cross-sectional gradient increasing from the end to the middle part to form a slope, and guide edges are provided on both sides of the front end of the slot wedge; The middle part of the slot wedge is composed of a square part and a trapezoidal part, and a wider side of the square part is connected to the upper bottom of the trapezoidal part; The tail of the slot wedge is thicker, 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 thicker; Multiple slot wedges are evenly distributed between the corresponding stator tooth tops, and the middle of each slot wedge is matched with the corresponding stator slot tooth top, that is, the square part in the middle of the slot wedge is consistent with the shape of the stator slot top opening, and the side of the trapezoidal part 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 part; The front end cover of the output end of the motor is provided with a first mounting hole matched with the tail of the slot wedge, and the bearing baffle at the tail of the motor is provided with a second mounting hole matched with the front end of the slot wedge.

2. The structure for reducing motor vibration noise according to claim 1, characterized in that: The rear part surface of the tail of the slot wedge is designed with an inclined surface, the lower part of the inclined surface is connected with 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 limited on the stator.

6. The structure for reducing motor vibration noise according to claim 1, characterized in that: The diameter of the bearing baffle is larger than the inner diameter of the stator.

7. The structure for reducing motor vibration noise according to claim 1, characterized in that: 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, so that the slot wedge can generate prestress on the tooth shoe at the top of the tooth.

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