Noise reduction motor

Abstract

The invention relates to a noise reduction motor, and relates to the field of motors, the noise reduction motor comprises a motor cavity and a bearing cavity, the inner wall of the motor cavity is provided with a liquid channel arranged along the circumferential direction of the motor cavity, the liquid channel is spiral and extends along the length direction of the motor cavity, the inner wall of the motor cavity is provided with a stator arranged along the circumferential direction of the motor cavity, and the bearing cavity is provided with a bearing. A stator tooth groove extending in the length direction of the stator is formed in the stator, a rotor is rotationally assembled in the motor cavity, a rotor tooth groove matched with the stator tooth groove is formed in the rotor, the liquid channel and the bearing cavity are communicated through a connecting piece and filled with lubricating liquid, the lubricating liquid can effectively absorb part of vibration, and therefore the vibration of the motor can be effectively reduced. And meanwhile, the lubricating liquid is communicated with the bearing cavity, so that the rotor can be continuously lubricated at the position of the bearing.

Description

Technical Field

[0001] The present application relates to the field of motor technology, and in particular to a noise reduction motor. Background Art

[0002] Cogging torque refers to the torque generated by the interaction between the permanent magnet and the stator core when the motor winding is not energized. It is caused by the tangential component of the interaction force between the permanent magnet and the armature teeth. The cogging torque will cause the motor to vibrate and make noise, resulting in speed fluctuations and affecting the smooth operation of the motor. In variable speed drives, when the torque pulsation frequency is consistent with the mechanical resonance frequency of the stator or rotor, the vibration and noise generated by the cogging torque will be amplified.

[0003] In an electric motor, an appropriate narrow slot is opened in the slot opening of the stator and the rotor to increase the magnetic resistance of the leakage flux, thereby reducing the leakage flux. The leakage flux refers to the magnetic flux that cannot generate torque. Reducing the leakage flux can improve the efficiency of the motor. When the existing motor is in use, semi-closed slots are generally opened on the stator and the rotor along their circumference. The rotor with semi-closed slots can reduce the stray loss and iron loss of the motor, but at the same time it will increase the rotor leakage reactance, resulting in a decrease in power factor and an increase in stator load current.

[0004] Since the slot type and size of the stator and rotor will affect the cogging torque of the motor, and the cogging torque will affect the sound of the motor when it is working, existing motors generally have the problem of excessive noise and low overall performance of the motor. Summary of the invention

[0005] The present application provides a noise reduction motor, which can solve the problem that the existing motor noise is too loud and the overall performance is low.

[0006] The technical solution of the present application is as follows: A noise reduction motor, comprising: A motor cavity, wherein the inner wall of the motor cavity is provided with a liquid channel arranged along its own circumference, the liquid channel is spiral and extends along the length direction of the motor cavity, the inner wall of the motor cavity is provided with a stator arranged along its own circumference, the stator is provided with stator tooth slots extending along its own length direction, and a rotor is rotatably assembled inside the motor cavity, and the rotor is provided with rotor tooth slots matching the stator tooth slots; A bearing cavity, wherein the bearing cavity is assembled on one side of the motor cavity, one end of the rotor passes through the motor cavity and the bearing cavity, and extends to the outside of the bearing cavity, the liquid channel is connected to the bearing cavity through a connector, and both are filled with lubricating liquid for absorbing the heat of the motor cavity and the noise generated by the rotor when it rotates, and a buffer fitting is provided inside the bearing cavity at one end of the rotor for buffering when the rotor undergoes axial displacement.

[0007] By adopting the above scheme, lubricating liquid is arranged in the liquid channel and the bearing cavity. The lubricating liquid can absorb the heat of the motor cavity when the motor is working, and when the motor vibrates, the lubricating liquid can effectively absorb part of the vibration, thereby reducing the noise generated by the motor when it is working. At the same time, the lubricating liquid is connected to the bearing cavity, so as to continuously lubricate the rotor at the bearing. In addition, when the rotor is working, once axial displacement occurs, the lubricating liquid can also generate axial resistance to the buffer fitting in the relative direction, thereby offsetting part of the axial pressure on the rotor.

[0008] In one embodiment of the present application, the stator comprises a plurality of annular stator punching sheets, each of which has a plurality of stator semi-closed slots formed in its circumferential direction, and a plurality of stator punching sheets are stacked and fixed to form the stator, and the stator semi-closed slots on the same axis of each stator punching sheet are combined to form the stator tooth slots; The stator semi-closed slot comprises: An arc-shaped hole segment having a partially circular shape, wherein the arc-shaped hole segment is opened in the stator punching sheet; An extended hole segment, one end of which is connected to the arc-shaped hole segment and the other end of which extends toward the center of the stator punching sheet; A slot section, one side of which is connected to the other end of the extension hole section, and the other side of which is provided with an opening pointing to the center of the stator punching sheet.

[0009] By adopting the above scheme, stator tooth slots are opened on the stator composed of a plurality of stacked stator punching sheets, so that the stator can increase the magnetic flux density and reduce the hysteresis loss and eddy current loss. At the same time, the semi-closed slot design enables the stator to retain a certain heat dissipation effect and reduce magnetic leakage loss and noise.

[0010] In one embodiment of the present application, the thickness d1 of the notch section, the opening width d2 of the notch section, the groove shoulder thickness d3 of the notch section and the groove shoulder width d4 of the notch section satisfy: 0.47mm≤d1=d3≤0.53mm; 1.77mm≤d2≤1.83mm; 4.0mm≤d4≤4.4mm.

[0011] By adopting the above solution, various parameters of the stator closed slots are defined, thereby optimizing the shape of the stator closed slots, so that the stator can further reduce leakage flux and reduce pulsation loss. In one embodiment of the present application, the rotor comprises: A rotor shaft, one end of which passes through the motor cavity and the bearing cavity and is rotatably connected to the motor cavity and the bearing cavity respectively through bearings, and the other end of which is rotatably assembled inside the motor cavity; A plurality of rotor punchings, which are stacked and fixed to each other and coaxially sleeved on the outside of the rotor shaft, and the rotor punchings are provided with a plurality of rotor semi-closed slots along their own circumference, and the rotor semi-closed slots on each rotor punching located on the same axis are combined to form the rotor tooth slots; The rotor semi-closed slot comprises: A rotor arc-shaped hole section having a partially circular shape, wherein the rotor arc-shaped hole section is opened in the rotor punching sheet; A rotor extension hole segment, one end of which is connected to the rotor arc-shaped hole segment, and the other end of which extends radially along the rotor punching sheet; A rotor slot section, one side of which is connected to the other end of the rotor extension hole section, and the other end is provided with a rotor opening extending radially along the rotor punching sheet.

[0012] By adopting the above scheme, rotor tooth slots are opened on the rotor composed of a plurality of stacked rotor punching sheets, and the rotor tooth slots are formed by overlapping and extending a plurality of rotor closed slots, so that the rotor can not only reduce magnetic leakage loss and pulsation loss, but also ensure a certain heat dissipation capacity.

[0013] In one embodiment of the present application, the slot thickness d5 of the rotor slot section, the slot width d6 of the rotor slot section, the slot body length d7 of the rotor semi-closed slot and the radius r of the circle in which the rotor arc hole section is located satisfy: 0.2mm≤d5≤0.8mm; 0.2mm≤d6≤0.8mm; 4.2mm≤d7≤5.0mm; 0.8mm≤r≤1.2mm.

[0014] By adopting the above scheme and further optimizing the shape of the rotor closed slot, the rotor tooth slot can further reduce the stray loss and iron loss of the motor under the premise of ensuring low rotor leakage reactance, thereby optimizing the performance of the entire motor.

[0015] In one embodiment of the present application, the buffer fitting is a disc-shaped component, and the buffer fitting is coaxially assembled on the outside of one end of the rotor shaft.

[0016] By adopting the above scheme, when the rotor shaft rotates, the buffer fitting of the disc-shaped component is provided, so that the resistance of the lubricating fluid to the buffer fitting during the rotation process is reduced. At the same time, when the rotor shaft undergoes axial displacement, due to the large area of ​​the side of the buffer fitting, the resistance of the lubricating fluid to the side of the buffer fitting can effectively buffer the pressure on the rotor shaft.

[0017] In one embodiment of the present application, the connecting member includes at least two connecting pipes, which are distributed at intervals along the circumference of the rotor shaft, extend along the length direction of the motor cavity, one end of which is assembled on the motor cavity and connected to the liquid channel, and the other end of which is assembled on the bearing cavity and connected to the bearing cavity.

[0018] By adopting the above solution, the connecting pipe can not only introduce the lubricating fluid into the bearing cavity to lubricate the bearing, but also connect the bearing cavity and the motor cavity to fix the motor cavity and the bearing cavity, so that the two are rigidly connected.

[0019] In one embodiment of the present application, the height h1 of the upper side wall of the liquid channel, the liquid level h2 of the lubricating liquid in the liquid channel, and the liquid level h3 of the lubricating liquid in the bearing cavity satisfy: h3 <h2

[0020] By adopting the above scheme, by limiting the height h1 on the upper side wall of the liquid channel, the liquid level height h2 of the lubricating liquid in the liquid channel and the liquid level height h3 of the lubricating liquid in the bearing cavity, the liquid level height of the lubricating liquid inside the liquid channel is always lower than the height of the inner wall above the liquid channel, so that the lubricating liquid can absorb the vibration of the motor cavity while its own liquid level oscillates. In addition, the lubricating liquid inside the bearing cavity is always filled, thereby reducing the resistance of the buffer fitting from the lubricating liquid when rotating.

[0021] In one embodiment of the present application, a liquid storage tank is mounted on the motor cavity, a cooling plate is provided on the liquid storage tank, and the liquid storage tank is connected to the liquid channel through a connecting pipe.

[0022] By adopting the above solution and providing a liquid storage tank with a cooling fin, the lubricating liquid inside the liquid channel can be cooled, so that the lubricating liquid can absorb vibration and reduce noise while achieving a better cooling effect.

[0023] In one embodiment of the present application, the noise reduction motor further includes a motor base, and the motor base includes: A connecting seat, the motor cavity and the lower end of the bearing cavity are both assembled on the upper surface of the connecting seat, and the lower surface of the connecting seat is provided with a concave surface; A shock-absorbing pad, which is mounted on the lower surface of the connecting seat and fits with the concave surface; The base is located below the connecting seat and is connected and fixed to the shock-absorbing pad. The upper surface of the base is provided with a convex surface that matches the concave shape.

[0024] ​By adopting the above solution, a shock-absorbing pad is provided, and the shock-absorbing pad is provided between the connecting seat and the base, so that when the motor is placed on the connecting seat for operation, the shock-absorbing pad can effectively reduce the vibration of the motor, thereby reducing the noise when the device is working.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. By setting a spiral liquid channel inside the motor cavity and passing the lubricating liquid into the liquid channel, the lubricating liquid can effectively absorb the vibration generated by the motor during operation, thereby reducing the noise generated when the motor is working. At the same time, the lubricating liquid can also absorb part of the heat of the motor cavity, thereby reducing the problems when the motor is working and improving the overall performance of the motor.

[0026] 2. The lubricating liquid in the liquid channel is passed into the bearing cavity, so that the lubricating liquid in the bearing cavity can continuously lubricate the rotor shaft. At the same time, a circumferentially rotating disc-shaped buffer fitting is provided on the rotor shaft. When the rotor shaft rotates and is subjected to axial pressure, the buffer fitting can squeeze the lubricating liquid, and the reaction force of the lubricating liquid can provide a certain amount of buffering effect for the rotor shaft.

[0027] 3. By limiting the shape of the rotor tooth slots and the stator tooth slots, further optimizing the slot width and thickness of the closed slot, as well as the slot shoulder width and thickness, opening smaller stator tooth slots and rotor tooth slots on the stator and rotor, the magnetic resistance of the leakage flux can be increased, thereby reducing the leakage flux. At the same time, due to the existence of the stator tooth slots and the rotor tooth slots, pulsation loss will be generated during rotation. Using smaller stator tooth slots and rotor tooth slots can effectively reduce the pulsation loss.

[0028] 4. By providing a liquid storage tank and arranging a cooling plate on the liquid storage tank, the cooling plate can reduce the temperature of the lubricating fluid inside the liquid storage tank, so that the lubricating fluid can more effectively absorb the heat of the liquid inside the liquid storage tank, making the cooling effect of the lubricating fluid more obvious. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a front cross-sectional view of a noise reduction motor provided in an embodiment of the present application; Figure 2 is a side view of a stator and a rotor of a noise reduction motor provided in an embodiment of the present application; Figure 3 is a side view of a stator tooth slot of a noise reduction motor provided in an embodiment of the present application; Figure 4 is a side view of a rotor tooth slot of a noise reduction motor provided in an embodiment of the present application; Figure 5 It is a front view of a buffer matching piece of a noise reduction motor provided in an embodiment of the present application; Figure 6 It is a front view of a motor base of a noise reduction motor provided in an embodiment of the present application.

[0030] Explanation of the reference numerals: 1. motor cavity; 11. liquid channel; 12. stator; 121. stator tooth slot; 122. stator punching sheet; 123. stator semi-closed slot; 1231. arc-shaped hole section; 1232. extended hole section; 1233. slot section; 13. rotor; 131. rotor tooth slot; 132. rotor shaft; 133. rotor punching sheet; 134. rotor semi-closed slot; 1341. rotor arc-shaped hole section; 1342. rotor extended hole section; 1343. rotor slot section; 135. buffer fitting; 2. bearing cavity; 21. connecting piece; 211. connecting pipe; 22. lubricating liquid; 3. liquid storage tank; 31. connecting pipe; 4. motor seat; 41. connecting seat; 411. concave surface; 42. shock-absorbing pad; 43. base; 431. convex surface. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1-6 A noise reduction motor provided in the present application is described in further detail.

[0032] A noise reduction motor provided in an embodiment of the present application includes: a motor cavity 1 and a bearing cavity 2.

[0033] See also Figure 1 The inner wall of the motor cavity 1 is provided with a liquid channel 11 arranged along its own circumference, and the liquid channel 11 is spiral and extends along the length direction of the motor cavity 1. The inner wall of the motor cavity 1 is provided with a stator 12 arranged along its own circumference, and the stator 12 is provided with a stator tooth slot 121 extending along its own length direction. The motor cavity 1 is rotatably equipped with a rotor 13 inside, and the rotor 13 is provided with a rotor tooth slot 131 matching the stator tooth slot 121; See also Figure 2The stator 12 includes a plurality of annular stator punching sheets 122, and the stator punching sheets 122 are provided with a plurality of stator semi-closed slots 123 in their own circumferential direction. The plurality of stator punching sheets 122 are stacked and fixed to form the stator 12, and the stator semi-closed slots 123 on the same axis of each stator punching sheet 122 are combined to form the stator tooth slots 121, and the stator semi-closed slots 123 include: an arc-shaped hole segment 1231, an extended hole segment 1232 and a slot segment 1233, and the arc-shaped hole segment 1231 has a partially circular shape, and the arc-shaped hole segment 1231 is opened on the stator punching sheet 122. One end of the extended hole section 1232 is connected to the arc hole section 1231, and the other end extends toward the center of the stator punching sheet 122. One side of the slot section 1233 is connected to the other end of the extended hole section 1232, and the other side is provided with an opening pointing to the center of the stator punching sheet 122. By arranging the stator punching sheet 122 and the stator semi-closed slot 123, and by arranging the semi-closed slot on the stator 12, the stator 12 can increase the magnetic flux density and reduce the hysteresis loss and eddy current loss. At the same time, the semi-closed slot design enables the stator 12 to retain a certain heat dissipation effect and reduce magnetic leakage loss and noise.

[0034] In related technologies, leakage flux refers to magnetic flux that cannot generate torque. Reducing leakage flux can improve the efficiency of the motor.

[0035] Closed slots can shorten the effective air gap and weaken the pulsation of the air gap magnetic field, thereby reducing the loss of the exciting magnetic potential and harmonic magnetic field, which helps to improve the performance of the motor.

[0036] See also Figure 3 The thickness d1 of the slot section 1233, the opening width d2 of the slot section 1233, the slot shoulder thickness d3 of the slot section 1233 and the slot shoulder width d4 of the slot section 1233 satisfy: 0.47mm≤d1=d3≤0.53mm; 1.77mm≤d2≤1.83mm; 4.0mm≤d4≤4.4mm, wherein preferably d1=d3=0.5mm, d2=1.8mm, d4=4.2mm, by adopting various parameters that limit the stator semi-closed slot 123, the stator tooth slot 121 is narrower than the existing stator tooth slot 121, thereby optimizing the shape of the stator semi-closed slot 123, so that the stator 12 can further reduce the leakage flux and reduce the pulsation loss.

[0037] Please continue reading Figure 2The rotor 13 comprises: a rotor shaft 132 and a plurality of rotor punchings 133, one end of the rotor shaft 132 passes through the motor cavity 1 and the bearing cavity 2, and is rotatably connected to the motor cavity 1 and the bearing cavity 2 respectively through a bearing, and the other end is rotatably assembled inside the motor cavity 1, a plurality of rotor punchings 133 are stacked and fixed to each other, and are coaxially sleeved on the outside of the rotor shaft 132, the rotor punching 133 is provided with a plurality of rotor semi-closed slots 134 along its own circumference, and the rotor semi-closed slots 134 on each rotor punching 133 located on the same axis are combined to form the rotor tooth slot 131, and the rotor semi-closed slots 134 comprise: a rotor arc hole section 134 1. A rotor extension hole section 1342 and a rotor slot section 1343. The rotor arcuate hole section 1341 has a partially circular shape. The rotor arcuate hole section 1341 is opened in the rotor punching 133. One end of the rotor extension hole section 1342 is connected to the rotor arcuate hole section 1341, and the other end extends radially along the rotor punching 133. One side of the rotor slot section 1343 is connected to the other end of the rotor extension hole section 1342, and the other end is provided with a rotor opening extending radially along the rotor punching 133. By setting a smaller rotor tooth slot 131, the rotor 13 can not only reduce magnetic leakage loss and pulsation loss, but also ensure a certain heat dissipation capacity.

[0038] See also Figure 4 , the slot thickness d5 of the rotor slot section 1343, the slot width d6 of the rotor slot section 1343, the slot body length d7 of the rotor semi-closed slot 134 and the radius r of the circle where the rotor arc hole section 1341 is located, satisfy: 0.2mm≤d5≤0.8mm; 0.2mm≤d6≤0.8mm; 4.2mm≤d7≤5.0mm; 0.8mm≤r≤1.2mm, wherein d5=d6=0.5mm, d7=4.6mm, r=1mm are preferably selected. By further optimizing the shape of the closed slot of the rotor 13, the rotor tooth slot 131 can ensure that the stray loss and iron loss of the motor are further reduced under the premise of low leakage reactance of the rotor 13.

[0039] See also Figure 1 and Figure 5 The buffer fitting 135 is a disc-shaped component, and the buffer fitting 135 is coaxially assembled on the outside of one end of the rotor shaft 132. By setting the flat buffer fitting 135, when the rotor shaft 132 is subjected to axial pressure, the buffer fitting 135 can squeeze the lubricating fluid 22, so that the lubricating fluid 22 can buffer the axial impact on the rotor shaft 132 after being squeezed.

[0040] The bearing cavity 2 is assembled on one side of the motor cavity 1, and one end of the rotor 13 passes through the motor cavity 1 and the bearing cavity 2, and extends to the outside of the bearing cavity 2. The liquid channel 11 is connected to the bearing cavity 2 through a connector 21, and both are filled with a lubricating liquid 22 for absorbing the heat of the motor cavity 1 and the noise generated by the rotor 13 when rotating. A buffer fitting 135 is provided at one end of the rotor 13 inside the bearing cavity 2 for buffering when the rotor 13 undergoes axial displacement. By providing a liquid channel 11 on the inner wall of the motor cavity 1 and passing the lubricating liquid 22 into the liquid channel 11 and the bearing cavity 2, the lubricating liquid 22 can effectively absorb the vibration generated by the motor during operation and reduce the noise of the motor, while absorbing the heat generated by the motor cavity and lubricating the rotor shaft 132, thereby reducing the bearing wear on the rotor shaft 132.

[0041] In this embodiment, the lubricating fluid 22 may be a perfluoropolyether heat transfer fluid or a water-soluble cooling lubricant.

[0042] Please continue reading Figure 1 , the height h1 of the upper side wall of the liquid channel 11, the liquid level h2 of the lubricating liquid 22 in the liquid channel 11 and the liquid level h3 of the lubricating liquid 22 in the bearing cavity 2 satisfy: h3 <h2

[0043] Please continue reading Figure 1 The connecting member 21 includes at least two connecting pipes 211, which are spaced apart along the circumference of the rotor shaft 132. The connecting pipe 211 extends along the length direction of the motor cavity 1, one end of which is assembled on the motor cavity 1 and communicated with the liquid channel 11, and the other end of which is assembled on the bearing cavity 2 and communicated with the bearing cavity 2. By providing the connecting pipe 211 that can connect and fix the motor cavity 1 and the bearing cavity 2, the lubricating liquid 22 can be introduced into the bearing cavity 2 to lubricate the rotor shaft 132, and the bearing cavity 2 is connected and fixed to the motor cavity 1.

[0044] Please continue reading Figure 1 The motor cavity 1 is equipped with a liquid storage tank 3, and a cooling plate (not shown) is arranged on the liquid storage tank 3. The liquid storage tank 3 is connected with the liquid channel 11 through a connecting pipe 31. By setting the cooling plate, the cooling plate can be used to cool the lubricating liquid 22 inside the liquid channel 11 and the liquid storage tank 3, thereby further improving the lubricating effect of the lubricating liquid 22.

[0045] See also Figure 6 ​The noise reduction motor also includes a motor seat 4, which includes: a connecting seat 41, a shock-absorbing pad 42 and a base 43. The lower ends of the motor cavity 1 and the bearing cavity 2 are both assembled on the upper surface of the connecting seat 41. The lower surface of the connecting seat 41 is provided with a concave surface 411. The shock-absorbing pad 42 is assembled on the lower surface of the connecting seat 41 and fits with the concave surface 411. The base 43 is located below the connecting seat 41 and is connected and fixed to the shock-absorbing pad 42. The upper surface of the base 43 is provided with a convex surface 431 that matches the shape of the concave surface 411. By setting the motor seat 4 and using the motor seat 4 with the built-in shock-absorbing pad 42, the motor seat 4 can absorb the vibration generated when the motor is working, thereby further reducing the noise generated when the electrode is working.

[0046] In summary, when the device is working, the lubricating liquid 22 can absorb the heat inside the motor cavity 1, and at the same time, the vibration generated when the motor is working can be transmitted to the lubricating liquid 22, so as to be absorbed by the lubricating liquid 22, thereby further reducing the noise generated when the motor is working; In addition, the lubricating liquid 22 inside the bearing cavity 2 can continuously lubricate the rotor shaft 132 at the bearing. When the rotor shaft 132 is subjected to axial pressure, the disc-shaped buffer fitting 135 located on the rotor shaft 132 can also squeeze the lubricating liquid 22 along the axial direction of the rotor shaft 132 inside the bearing cavity 2. The lubricating liquid 22 can effectively reduce the axial impact on the rotor shaft 132.

[0047] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A noise reduction motor, characterized in that: include: A motor cavity (1), wherein the inner wall of the motor cavity (1) is provided with a liquid channel (11) arranged along the circumference thereof, the liquid channel (11) is spiral-shaped and extends along the length direction of the motor cavity (1), the inner wall of the motor cavity (1) is provided with a stator (12) arranged along the circumference thereof, the stator (12) is provided with a stator tooth slot (121) extending along the length direction thereof, and a rotor (13) is rotatably mounted inside the motor cavity (1), the rotor (13) being provided with a rotor tooth slot (131) matching the stator tooth slot (121); A bearing cavity (2), wherein the bearing cavity (2) is assembled on one side of the motor cavity (1), one end of the rotor (13) penetrates the motor cavity (1) and the bearing cavity (2), and extends to the outside of the bearing cavity (2), the liquid channel (11) is connected to the bearing cavity (2) through a connecting piece (21), and both are filled with lubricating liquid (22) for absorbing heat from the motor cavity (1) and noise generated by the rotor (13) when rotating, and one end of the rotor (13) is provided with a buffer fitting (135) inside the bearing cavity (2) for buffering when the rotor (13) undergoes axial displacement; The height h1 of the upper side wall of the liquid channel (11), the liquid level h2 of the lubricating liquid (22) in the liquid channel (11), and the liquid level h3 of the lubricating liquid (22) in the bearing cavity (2) satisfy: h3 <h2<h1; The motor cavity (1) is equipped with a liquid storage bin (3), a cooling plate is provided on the liquid storage bin (3), and the liquid storage bin (3) is connected to the liquid channel (11) via a connecting pipe (31).

2. A noise reduction motor according to claim 1, characterized in that: The stator (12) comprises a plurality of annular stator punching sheets (122), each of which is provided with a plurality of stator semi-closed slots (123) in its circumferential direction, and the plurality of stator punching sheets (122) are stacked and fixed to form the stator (12), and the stator semi-closed slots (123) on the same axis on each stator punching sheet (122) are combined to form the stator tooth slots (121); The stator semi-closed slot (123) comprises: An arc-shaped hole segment (1231) having a partially circular shape, wherein the arc-shaped hole segment (1231) is opened in the stator punching sheet (122); An extended hole segment (1232), one end of the extended hole segment (1232) is connected to the arc-shaped hole segment (1231), and the other end extends toward the center of the stator punching sheet (122); A notch section (1233), one side of the notch section (1233) is connected to the other end of the extension hole section (1232), and the other side is provided with an opening pointing to the center of the stator punching sheet (122).

3. A noise reduction motor according to claim 2, characterized in that: The thickness d1 of the notch section (1233), the opening width d2 of the notch section (1233), the groove shoulder thickness d3 of the notch section (1233) and the groove shoulder width d4 of the notch section (1233) satisfy: 0.47mm≤d1=d3≤0.53mm; 1.77mm≤d2≤1.83mm; 4.0mm≤d4≤4.4mm.

4. A noise reduction motor according to claim 1, characterized in that: The rotor (13) comprises: a rotor shaft (132), one end of the rotor shaft (132) passing through the motor cavity (1) and the bearing cavity (2), and being rotationally connected to the motor cavity (1) and the bearing cavity (2) respectively through a bearing, and the other end of the rotor shaft (132) being rotationally assembled inside the motor cavity (1); A plurality of rotor punching sheets (133), wherein the plurality of rotor punching sheets (133) are stacked and fixed to each other and are coaxially sleeved on the outside of the rotor shaft (132), wherein the rotor punching sheets (133) are provided with a plurality of rotor semi-closed slots (134) along their own circumference, and the rotor semi-closed slots (134) on each rotor punching sheet (133) located on the same axis are combined to form the rotor tooth slots (131); The rotor semi-closed slot (134) comprises: A rotor arc-shaped hole section (1341) having a partially circular shape, wherein the rotor arc-shaped hole section (1341) is opened in the rotor punching sheet (133); A rotor extension hole section (1342), one end of the rotor extension hole section (1342) is connected to the rotor arc-shaped hole section (1341), and the other end of the rotor extension hole section (1342) extends radially along the rotor punching sheet (133); A rotor slot section (1343), one side of the rotor slot section (1343) is connected to the other end of the rotor extension hole section (1342), and the other end is provided with a rotor opening extending radially along the rotor punching sheet (133).

5. A noise reduction motor according to claim 4, characterized in that: The slot thickness d5 of the rotor slot section (1343), the slot width d6 of the rotor slot section (1343), the slot body length d7 of the rotor semi-closed slot (134) and the radius r of the circle in which the rotor arc hole section (1341) is located satisfy the following conditions: 0.2mm≤d5≤0.8mm; 0.2mm≤d6≤0.8mm; 4.2mm≤d7≤5.0mm; 0.8mm≤r≤1.2mm.

6. The noise reduction motor according to claim 4, characterized in that: The buffer fitting (135) is a disc-shaped component, and the buffer fitting (135) is coaxially assembled on the outside of one end of the rotor shaft (132).

7. The noise reduction motor according to claim 1, characterized in that: The connecting member (21) comprises at least two connecting pipes (211), the connecting pipes (211) being spaced apart along the circumference of the rotor shaft (132), the connecting pipes (211) extending along the length direction of the motor cavity (1), one end of the connecting pipe being assembled on the motor cavity (1) and communicating with the liquid channel (11), and the other end of the connecting pipe being assembled on the bearing cavity (2) and communicating with the bearing cavity (2).

8. The noise reduction motor according to claim 1, characterized in that: The noise reduction motor further comprises a motor base (4), wherein the motor base (4) comprises: A connecting seat (41), the lower ends of the motor cavity (1) and the bearing cavity (2) are both assembled on the upper surface of the connecting seat (41), and the lower surface of the connecting seat (41) is provided with a concave surface (411); A shock-absorbing pad (42), the shock-absorbing pad (42) being mounted on the lower surface of the connecting seat (41) and being in contact with the concave surface (411); A base (43), the base (43) is located below the connecting seat (41) and is connected and fixed to the shock absorbing pad (42), and the upper surface of the base (43) is provided with a convex surface (431) that matches the shape of the concave surface (411).

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