A motor rotor structure and a motor

Abstract

This invention provides a motor rotor structure and a motor. The motor rotor structure includes: a rotating shaft, a rotor sleeve, a dynamic balancing disc, a first dynamic balancing component, and a second dynamic balancing component. The rotor sleeve is fitted around the outer periphery of the rotating shaft, and a flange is provided at one axial end of the rotor sleeve. The dynamic balancing disc is provided at the other axial end of the rotor sleeve, and at least one first dynamic balancing hole is provided on the flange extending axially. The first dynamic balancing component can be inserted into the first dynamic balancing hole. At least one second dynamic balancing hole is provided on the dynamic balancing disc extending axially, and the second dynamic balancing component can be inserted into the second dynamic balancing hole. According to this invention, the weight-reducing holes are formed without cutting the main body structure of the motor rotor, which does not affect the reusability of the rotor, improves the versatility of the rotor body, and allows for rapid adjustment of the rotor's dynamic balance.

Description

Technical Field

[0001] This invention relates to the field of motor technology, specifically to a motor rotor structure and a motor. Background Technology

[0002] An electric motor consists of a rotor and a stator. The dynamic balance of the rotor has a significant impact on the motor's performance. The inertial force or torque of the unbalanced rotor mass is one of the main causes of vibration in rotating machinery. To eliminate or reduce motor vibration, the primary method is to balance the rotor, limiting the machine's vibration to within acceptable limits. Traditionally, the rotor core of an electric motor is balanced by reducing weight at both ends. This weight reduction is typically achieved by cutting metal with a cutting machine. This method has significant drawbacks, including substantial safety hazards, difficulty in controlling the cutting amount, and the rotor, after being dynamically balanced by cutting, is not reusable—essentially a disposable item, resulting in severe resource waste.

[0003] Patent CN 206595790 U proposes a rotor structure capable of dynamic balancing correction. The rotor shaft has a rotor with multiple evenly distributed dynamic balancing holes that mate with dynamic balancing pins. These dynamic balancing holes are through holes. However, through holes present certain machining difficulties for longer rotors, and the dynamic balancing pins are non-standard parts lacking universality. Furthermore, the dynamic balancing pins are unthreaded, making it difficult to guarantee their axial position, which poses a safety hazard when the rotor is running at high speed.

[0004] Patent CN 202840717 U proposes a rotor assembly with aluminum rings on both sides of the rotor core. The outer surface of the aluminum rings has multiple grooves. By performing radial weight reduction machining on the aluminum rings, the dynamic balance of the rotor can be improved. However, the weight reduction needs to be done manually, which has two drawbacks. First, the iron filings generated by cutting can easily enter the motor rotor, thus seriously threatening the rotor's safety. Second, manual cutting is difficult to control, and the weight reduction needs to be repeatedly checked, which seriously wastes time and manpower.

[0005] Because existing motor rotor structures achieve weight reduction and dynamic balance by cutting to form weight-reducing holes, the rotors are not reusable, have poor versatility, and the through holes are difficult to process for longer rotors. The iron chips generated during cutting can easily enter the motor rotor and affect rotor safety. Manual cutting is also difficult to control the weight reduction. Therefore, this invention studies and designs a motor rotor structure and a motor. Summary of the Invention

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the defects of the existing motor rotor structure, which achieves weight reduction and dynamic balance by cutting to form weight reduction holes and other structures, resulting in the rotor being non-reusable and having poor versatility, thereby providing a motor rotor structure and motor.

[0007] To address the above problems, the present invention provides a motor rotor structure, comprising:

[0008] The device comprises a rotating shaft, a rotor bushing, a dynamic balancing disc, a first dynamic balancing component, and a second dynamic balancing component. The rotor bushing is fitted around the outer circumference of the rotating shaft, and a flange is provided at one axial end of the rotor bushing. The dynamic balancing disc is provided at the other axial end of the rotor bushing, and at least one first dynamic balancing hole is provided on the flange extending in the axial direction. The first dynamic balancing component can be inserted into the first dynamic balancing hole. At least one second dynamic balancing hole is provided on the dynamic balancing disc extending in the axial direction. The second dynamic balancing component can be inserted into the second dynamic balancing hole.

[0009] In some embodiments, the rotor bushing includes a bushing body, which is a cylindrical structure. The flange is disposed at one axial end of the bushing body and fixed to the bushing body. The outer diameter of the flange is larger than the outer diameter of the bushing body. The first dynamic balancing hole extends from one axial end of the flange to the other axial end.

[0010] In some embodiments, the dynamic balancing disc is sleeved on the outer periphery of the other axial end of the bushing body, and the outer diameter of the dynamic balancing disc is larger than the outer diameter of the bushing body, and the second dynamic balancing hole extends from one axial end of the dynamic balancing disc to the other axial end.

[0011] In some embodiments, a rotor end ring is also fitted around the outer periphery of the bushing body. The rotor end ring is in contact with the axial end face of the flange. The first dynamic balancing hole is located radially outside the outer periphery of the bushing body along the radial direction of the rotor bushing. A third dynamic balancing hole is provided on the rotor end ring extending axially. The third dynamic balancing hole is opposite to the first dynamic balancing hole, so that the first dynamic balancing component can also be inserted into the third dynamic balancing hole.

[0012] In some embodiments, the axial end face of the flange includes a first part and a second part, the first part being connected to the bushing body, the second part being connected to the rotor end ring, and the second part being located on the radial outer periphery of the first part, and the first dynamic balancing member being able to pass through the first dynamic balancing hole and the third dynamic balancing hole in sequence.

[0013] In some embodiments, a plurality of magnets are further provided on the outer periphery of the bushing body and between the rotor end ring and the dynamic balancing disc, and a protective sleeve is also provided on the outer periphery of the magnets.

[0014] In some embodiments, the dynamic balancing disc and the rotor end ring are both made of non-magnetic metallic materials; and / or, the first dynamic balancing component and the second dynamic balancing component are both threaded components.

[0015] In some embodiments, the flange is further provided with an axially oriented oil injection hole, which is positioned axially opposite to the outer and inner circumferential surfaces of the bushing body, and extends from the axial end face of the flange away from the bushing body to the interior of the bushing body.

[0016] The inner radial circumferential surface of the bushing body is also provided with an oil groove. The oil groove is formed by a recess from the inner radial circumferential surface of the bushing body in a radially outward direction, so that the inner radial side of the oil groove is connected to the rotating shaft, and the oil groove is connected to the oil injection hole.

[0017] In some embodiments, along the axial direction of the rotor bushing, the oil groove is located between the rotor end ring and the dynamic balance disc, and one end of the oil injection hole extending into the interior of the bushing body is also located between the rotor end ring and the dynamic balance disc and communicates with the oil groove.

[0018] In some embodiments, the oil tank is an annular oil tank; there are at least two oil injection holes, at least one of which can introduce oil from outside the flange and into the oil tank, and at least one oil injection hole is connected to the oil tank and can be used to discharge the oil in the oil tank.

[0019] In some embodiments, when it is necessary to disassemble the rotor bushing from the shaft, the oil groove is filled with oil, the oil inlet for draining oil is closed, and gas is introduced into the oil inlet for injecting oil to separate the rotor bushing from the shaft.

[0020] In some embodiments, the inner wall of the oil injection hole is provided with an internal thread, which can cooperate with a threaded component to control the opening and closing of the oil injection hole.

[0021] In some embodiments, the depth of the oil groove along the radial direction of the rotor bushing is 1 to 3 mm, and the length of the oil groove along the axial direction of the rotor bushing is half the axial length of the rotor bushing.

[0022] In some embodiments, the flange is an annular cylindrical structure, and there are multiple first dynamic balancing holes, which are spaced apart along the circumferential direction of the flange; there is at least one first dynamic balancing component, and the first dynamic balancing component can be positioned in the corresponding first dynamic balancing hole according to the eccentric force of the motor rotor structure.

[0023] The dynamic balancing disc is a circular cylindrical structure, and there are multiple second dynamic balancing holes, which are spaced apart along the circumferential direction of the dynamic balancing disc; there is at least one second dynamic balancing component, and the second dynamic balancing component can be set into the corresponding second dynamic balancing hole according to the eccentric force of the motor rotor structure.

[0024] The present invention also provides an electric motor, which includes the aforementioned motor rotor structure.

[0025] The motor rotor structure and motor provided by this invention have the following beneficial effects:

[0026] 1. This invention, by fitting a rotor bushing around the outer circumference of the motor shaft and setting a flange at one axial end of the rotor bushing, allows for the positioning and installation of the rotor end ring while simultaneously creating a first dynamic balancing hole on the flange. A first dynamic balancing component can be inserted into this hole to adjust the dynamic balance at one axial end of the motor rotor structure. A dynamic balancing disc is set at the other axial end of the rotor bushing, and a second dynamic balancing hole is set on the disc, allowing a second dynamic balancing component to be inserted into it to effectively adjust the dynamic balance at the other axial end of the motor rotor structure. This invention eliminates the need for cutting the motor rotor body to create weight-reducing holes, does not affect rotor reusability, and improves the versatility of the rotor body (including the shaft, etc.). It enables rapid adjustment of rotor dynamic balance, and the optimized dynamic balance significantly reduces motor vibration and noise. Furthermore, the external dynamic balancing holes significantly improve the heat dissipation performance of the rotor body and reduce its weight, thus minimizing power loss.

[0027] 2. This invention also utilizes the structure of oil injection holes and oil grooves on the rotor bushing to effectively lubricate and cool the shaft while allowing gas to be introduced through the oil grooves. The gas pressure effectively separates the shaft from the rotor bushing. The addition of oil injection holes on the rotor facilitates the injection of lubricating oil during disassembly. The pressurized lubricating oil fills the rotor oil grooves, reducing the friction between the spindle and the rotor, simplifying rotor disassembly, and achieving rapid and effective disassembly. This effectively improves per capita efficiency and reduces labor costs. Attached Figure Description

[0028] Figure 1 This is a radial cross-sectional view of the motor rotor structure of the present invention;

[0029] Figure 2 yes Figure 1 A magnified view of a portion of section A;

[0030] Figure 3a This is a three-dimensional structural diagram of the rotor bushing in the motor rotor structure of the present invention;

[0031] Figure 3b This is a radial sectional view of the rotor bushing of the present invention;

[0032] Figure 4 This is a three-dimensional structural diagram of the dynamic balancing disc in the motor rotor structure of the present invention.

[0033] The reference numerals in the attached figures are as follows:

[0034] 1. Rotary shaft; 2. Rotor bushing; 21. Flange; 22. Bushing body; 3. Dynamic balancing disc; 4. First dynamic balancing hole; 5. Second dynamic balancing hole; 6. Rotor end ring; 7. Magnet; 8. Sheath; 9. Oil injection hole; 10. Oil groove. Detailed Implementation

[0035] like Figure 1-4 As shown, the present invention provides a motor rotor structure, which includes:

[0036] The rotating shaft 1, rotor bushing 2, dynamic balancing disc 3, first dynamic balancing component and second dynamic balancing component are provided. The rotor bushing 2 is sleeved on the outer periphery of the rotating shaft 1, and a flange 21 is provided at one axial end of the rotor bushing 2. The dynamic balancing disc 3 is provided at the other axial end of the rotor bushing 2, and at least one first dynamic balancing hole 4 is provided on the flange 21 extending in the axial direction. The first dynamic balancing component can be inserted into the first dynamic balancing hole 4. At least one second dynamic balancing hole 5 is provided on the dynamic balancing disc 3 extending in the axial direction. The second dynamic balancing component can be inserted into the second dynamic balancing hole 5.

[0037] This invention involves fitting a rotor sleeve around the outer circumference of the motor shaft and installing a flange at one axial end of the rotor sleeve. This allows for simultaneous positioning and installation of the rotor end ring, while simultaneously creating a first dynamic balancing hole on the flange. A first dynamic balancing component can be inserted into this hole to adjust the dynamic balance at one axial end of the motor rotor structure. A dynamic balancing disc is located at the other axial end of the rotor sleeve, and a second dynamic balancing hole is provided on this disc. This allows for the insertion of a second dynamic balancing component to effectively adjust the dynamic balance at the other axial end of the motor rotor structure. This invention eliminates the need for cutting the main rotor structure to create weight-reducing holes, thus preserving the rotor's reusability and improving the versatility of the rotor body (including the shaft). It enables rapid adjustment of the rotor's dynamic balance, significantly reducing motor vibration and noise after optimization. Furthermore, the external dynamic balancing holes significantly improve the rotor's heat dissipation performance and reduce its weight, thereby minimizing power loss.

[0038] This invention proposes a method for quickly completing rotor dynamic balancing and a rotor structure that can be quickly installed and disassembled.

[0039] 1. By adding dynamic balancing holes to the dynamic balancing disc and rotor bushing, and by adding hexagonal set screws of different masses, the dynamic balance of the rotor can be quickly adjusted. After dynamic balancing optimization, the vibration and noise of the motor are significantly reduced. In addition, the dynamic balancing holes can significantly improve the heat dissipation performance of the rotor body and reduce the weight of the rotor body, thereby reducing power loss.

[0040] 2. By creating an oil groove structure on the inner circle of the rotor, the difficulty of rotor assembly is reduced, making assembly and disassembly easier, effectively improving per capita efficiency and reducing labor costs.

[0041] 3. Adding an oil injection hole to the rotor makes it easy to inject lubricating oil during disassembly. The lubricating oil can be pressurized to fill the rotor oil groove, reducing the friction between the spindle and the rotor and making rotor disassembly easier.

[0042] It has the following beneficial effects:

[0043] 1. Improve the rotor dynamic balance coefficient to reduce motor vibration and noise;

[0044] 2. The dynamic balancing holes improve the heat dissipation performance of the rotor body and reduce its weight, thus reducing power loss.

[0045] 3. The rotor's oil injection hole is lubricated during disassembly, reducing the difficulty of rotor disassembly.

[0046] In some embodiments, the rotor bushing 2 includes a bushing body 22, which is a cylindrical structure. A flange 21 is disposed at one axial end of the bushing body 22 and fixed to it. The outer diameter of the flange 21 is larger than the outer diameter of the bushing body 22. The first dynamic balancing hole 4 extends from one axial end of the flange 21 to the other axial end. This is a further preferred structural form of the rotor bushing of the present invention, which also includes a bushing body. The bushing body is mainly used to fit around the outer circumference of the rotating shaft. The outer circumference of the bushing is used to install the magnet structure. The first dynamic balancing hole is a structure that penetrates the flange, so that the first dynamic balancing hole is located on the outer circumference of the bushing body, thus enhancing its dynamic balancing effect. Furthermore, this location can also cooperate with the rotor end ring to further improve the dynamic balancing effect.

[0047] In some embodiments, the dynamic balancing disc 3 is sleeved on the outer periphery of the other axial end of the bushing body 22, and the outer diameter of the dynamic balancing disc 3 is larger than the outer diameter of the bushing body 22. The second dynamic balancing hole 5 extends from one axial end of the dynamic balancing disc 3 to the other axial end. This is a preferred structural form of the dynamic balancing disc of the present invention, that is, it is sleeved on the outer periphery of the other axial end of the bushing body, and the second dynamic balancing hole is also a through structure, so that it is located on the outer periphery of the bushing body. The further outward it is located radially, the better its dynamic balancing effect. Therefore, the setting of the dynamic balancing disc and the second dynamic balancing hole of the present invention can improve the dynamic balancing effect of the motor rotor.

[0048] In some embodiments, a rotor end ring 6 is further fitted around the outer periphery of the bushing body 22. The rotor end ring 6 is connected to the axial end face of the flange 21. The first dynamic balancing hole 4 is located radially outside the outer periphery of the bushing body 22 along the radial direction of the rotor bushing 2. A third dynamic balancing hole is provided on the rotor end ring 6 extending axially. The third dynamic balancing hole is opposite to the first dynamic balancing hole 4, so that the first dynamic balancing component can also be inserted into the third dynamic balancing hole. The present invention can effectively position the magnet and the sheath by setting the rotor end ring, and can also achieve the effect of magnetic isolation by setting the rotor end ring at the position opposite to the first dynamic balancing hole on the flange. The present invention also allows the first dynamic balancing component to pass through the first and third dynamic balancing holes simultaneously, thereby increasing the length of the dynamic balancing and increasing the mass of the dynamic balancing action, thus further improving the dynamic balancing effect.

[0049] This invention is based on a permanent magnet synchronous motor. An oil injection hole is added to the motor rotor to facilitate the injection of lubricating oil during disassembly. Dynamic balancing holes are added to the motor rotor bushing and the rotor end ring. By adding set screws to increase weight, the dynamic balance of the motor rotor can be quickly adjusted. The operation is simple and does not damage the structure of the motor rotor itself. The dynamic balancing holes can improve the rotor's heat dissipation efficiency and reduce the weight of the motor rotor, thereby reducing power loss.

[0050] In some embodiments, the axial end face of the flange 21 includes a first portion and a second portion. The first portion is connected to the bushing body 22, and the second portion is connected to the rotor end ring 6. The second portion is located on the radial outer periphery of the first portion, and the first dynamic balancing member can sequentially pass through the first dynamic balancing hole 4 and the third dynamic balancing hole. This is a preferred structural form between the rotor end ring, flange, and bushing body of the present invention. That is, the rotor end ring is sleeved on the outer periphery of the bushing body and located on the axial side of the flange facing the dynamic balancing disc, which can improve the dynamic balancing effect on the motor rotor structure through the radially outer rotor end ring and the third dynamic balancing hole.

[0051] In some embodiments, a plurality of magnets 7 are further disposed on the outer periphery of the bushing body 22 and between the rotor end ring 6 and the dynamic balancing disk 3, and a protective sleeve 8 is fitted around the outer periphery of the magnets 7. The present invention also enables the magnet structure disposed on the outer periphery of the bushing body to interact with the stator and be driven by a magnetic field to form the rotation of the rotor structure, and the protective sleeve serves to fix and protect the outer periphery of the magnets.

[0052] The rotor bushing 2 of this invention is the reference part of the entire rotor. The rotor end ring 6 is heated to 200°C and then heat-fitted and fixed to the bottom of the rotor bushing 2 (the side with the flange). Twenty magnets 7 are arranged and pasted on the outer circle of the rotor bushing. After the glue cures, the position of the magnets 7 is fixed. Then the rotor's dynamic balance disk 3 is heated to 200°C and heat-fitted to the top of the rotor bushing 2 (the side without the flange). The rotor end ring and the dynamic balance disk have the function of magnetic isolation rings. Then the rotor sheath 8 is assembled on the outer layer of the magnets. The rotor sheath 8 is usually made of carbon fiber or glass fiber, which can effectively ensure the strength and stability of the rotor. The thickness of the sheath is about one millimeter. The outer diameter of the sheath 8 is the same as the outer diameter of the rotor end ring 6 and the outer diameter of the dynamic balance disk 3. The inner hole of the rotor bushing can be inserted into the mandrel (i.e., the rotating shaft 1).

[0053] In some embodiments, the dynamic balancing disc 3 and the rotor end ring 6 are both made of non-magnetic metallic material; and / or, the first dynamic balancing component and the second dynamic balancing component are both threaded components. The dynamic balancing disc and rotor end ring of the present invention, made of non-magnetic metallic material, can effectively isolate the magnetic fields at both ends of the magnet along the axial direction, and are also conductive. Furthermore, dynamic balancing holes are provided on the dynamic balancing disc and rotor end ring, enabling them to adjust the dynamic balance of the motor rotor while simultaneously initiating magnetic isolation. Preferably, the dynamic balancing component is a threaded component that can be inserted into the dynamic balancing hole to achieve eccentric dynamic balance adjustment.

[0054] Figure 1 This is a cross-sectional view of the motor rotor of this patent. The inner circle of the rotor bushing 2 fits with the outer circle of the rotating shaft 1. Magnets 7 are neatly pasted on the outer circle of the rotor bushing 2. The outer circle of the magnets 7 fits with the inner circle of the rotor sheath 8. The sheath is made of carbon fiber with a thickness of 1 mm. The oil injection hole 9 is located on the left side of the rotor bushing 2. The end of the oil injection hole 9 is connected to the oil groove 10. The first dynamic balance hole 4 and the second dynamic balance hole 5 are the same size. Both can be made of small-diameter internal hexagon set screws of different lengths. The rotor end ring 6 and the dynamic balance disc 3 are both made of non-magnetic metal materials.

[0055] In some embodiments, the flange 21 is further provided with an oil injection hole 9 along the axial direction. The oil injection hole 9 is positioned opposite to the outer and inner circumferential surfaces of the bushing body 22 along the axial direction, and the oil injection hole 9 extends from the axial end face of the flange 21 away from the bushing body 22 to the interior of the bushing body 22.

[0056] The inner radial surface of the bushing body 22 is also provided with an oil groove 10. The oil groove 10 is formed by recessing from the inner radial surface of the bushing body 22 in a radially outward direction, so that the inner radial side of the oil groove 10 is connected to the rotating shaft 1, and the oil groove 10 is connected to the oil injection hole 9.

[0057] This invention also utilizes an oil injection hole and oil groove structure on the rotor bushing to effectively lubricate and cool the shaft while allowing gas to be introduced through the oil groove. The gas pressure effectively separates the shaft from the rotor bushing. The addition of an oil injection hole on the rotor facilitates the injection of lubricating oil during disassembly. The pressurized lubricating oil fills the rotor oil groove, reducing the friction between the spindle and the rotor, simplifying rotor disassembly, and achieving rapid and effective disassembly. This effectively improves per capita efficiency and reduces labor costs.

[0058] In some embodiments, along the axial direction of the rotor bushing 2, the oil groove 10 is located between the rotor end ring 6 and the dynamic balance disk 3, and one end of the oil injection hole 9 extending into the interior of the bushing body 22 is also located between the rotor end ring 6 and the dynamic balance disk 3 and communicates with the oil groove 10. Preferably, the oil groove of the present invention is located between the rotor end ring and the dynamic balance disk, which can lubricate and dissipate the rotating shaft part that mainly rotates under the drive of the magnetic field. The oil injection hole of the present invention extends between the end ring and the dynamic balance disk to prevent leakage in the oil groove. The oil groove allows the oil pressure and air pressure of the bushing and the rotating shaft to achieve separation and disassembly.

[0059] In some embodiments, the oil groove 10 is an annular oil groove; there are at least two oil injection holes 9, at least one of which can introduce oil from outside the flange 21 and enter the oil groove 10, and at least one oil injection hole 9 communicates with the oil groove 10 to discharge the oil in the oil groove 10. This is a preferred structural form of the oil groove of the present invention. The annular oil groove can increase the contact area between the oil groove and the rotating shaft and the rotor bushing, which increases the lubrication and heat dissipation effect, and also increases the area of ​​action between the two through air pressure and oil pressure separation, thereby improving the ease of disassembly. The oil injection hole of the present invention includes at least one hole for oil inlet and at least one hole for oil outlet, which allows the oil to circulate in the oil groove, improves the heat dissipation effect, and requires the oil outlet hole to be blocked during disassembly, thereby increasing the air pressure through the oil inlet hole to achieve the separation and disassembly between the bushing and the rotating shaft.

[0060] In some embodiments, when it is necessary to disassemble the rotor bushing 2 from the rotating shaft 1, the oil groove 10 is filled with oil, the oil inlet 9 for draining oil is closed, and gas is introduced into the oil inlet for filling oil to separate the rotor bushing 2 from the rotating shaft 1. This is a preferred disassembly method of the present invention, in which the oil drain hole is blocked to maintain the pressure inside the oil groove, and then gas is introduced to effectively separate the bushing from the rotating shaft by using air pressure to drive the lubricating oil.

[0061] Figure 2 This is a partially enlarged view of the present invention after installation. The inner circle of the rotor bushing 2 fits with the outer circle of the rotating shaft 1. There is a first dynamic balancing hole 4, a rotor end ring 6, a magnet 7, and an oil injection hole 9. The opening of the oil injection hole 9 is threaded, which can ensure its sealing when pressure is applied. The end of the oil injection hole 9 is directly connected to the oil groove 10. High-pressure gas can be introduced to fill the oil groove with lubricating oil. The continuous filling of the oil groove with lubricating oil can help the rotor bushing 2 separate from the rotating shaft 1, solving the problem of rust and difficulty in disassembly.

[0062] The beginning of the oil injection hole is threaded, which ensures its sealing when pressurized. The end of the oil injection hole is directly connected to the oil groove 10. High-pressure gas is introduced to fill the oil groove 10 with lubricating oil and then it flows out from the other side of the oil injection hole. Then, one of the oil injection holes is blocked and pressurization is continued. The one-way air pressure can help the rotor bushing 2 separate from the rotor shaft 1 and keep the lubricating oil continuously filling the oil groove.

[0063] In some embodiments, the inner wall of the oil filling hole 9 is provided with internal threads, which can cooperate with a threaded component to control the closing and opening of the oil filling hole 9. Preferably, the oil filling hole of the present invention has internal threads on its inner wall, which can be effectively tightened by a threaded component to achieve closure, and opened by unscrewing the threads to restore connectivity when needed.

[0064] In some embodiments, the depth of the oil groove 10 along the radial direction of the rotor bushing 2 is 1-3 mm, and the length of the oil groove 10 along the axial direction of the rotor bushing 2 is half the axial length of the rotor bushing 2. Setting the radial depth of the oil groove within the above range allows for an increase in oil groove volume without affecting the structure of the bushing or the structure of the magnets on the outer periphery of the bushing. The axial length of the oil groove is set as long as possible to increase the oil groove volume, thereby improving the cooling and lubrication effect on the rotating shaft and increasing the ease of disassembling the bushing and the rotating shaft.

[0065] In some embodiments, the flange 21 is an annular cylindrical structure, and there are multiple first dynamic balancing holes 4, which are spaced apart along the circumferential direction of the flange 21; there is at least one first dynamic balancing component, and the first dynamic balancing component can be set into the corresponding first dynamic balancing hole 4 according to the eccentric force of the motor rotor structure.

[0066] The dynamic balancing disk 3 is a circular cylindrical structure, and there are multiple second dynamic balancing holes 5, which are spaced apart along the circumferential direction of the dynamic balancing disk 3; there is at least one second dynamic balancing component, and the second dynamic balancing component can be set into the corresponding second dynamic balancing hole 5 according to the eccentric force of the motor rotor structure.

[0067] The flange and dynamic balancing disc of the present invention are preferably circular cylindrical structures so as to be effectively fitted onto the bushing body. One or more first dynamic balancing components can be set through multiple first dynamic balancing holes to achieve precise dynamic balancing control in multiple directions. One or more second dynamic balancing components can be set through multiple second dynamic balancing holes to achieve precise dynamic balancing control in multiple directions.

[0068] Figures 3a-3b The rotor bushing 2 for the motor rotor is made of a high-strength, non-deformable metal magnetic material. Because the rotor bushing is complex to machine and has many dynamic balancing holes, it is prone to deformation during machining. Therefore, a high-strength metal must be used. There are a total of 24 dynamic balancing holes on the rotor bushing to adjust and distribute the imbalance. An oil groove 10 is set inside the rotor bushing. The depth of the oil groove 10 is preferably about 2mm, and the width of the oil groove 10 is about half the total length of the rotor bushing. The oil injection hole 9 is threaded and connected to the oil groove 10 at its end, which facilitates the injection of lubricating oil and the introduction of high-pressure gas. The introduction of high-pressure gas makes the lubricating oil fill the entire rotor oil groove, solving the problem of rust and difficulty in disassembly. At the same time, the weight reduced by the oil groove 10 can also reduce the overall weight of the motor rotor and reduce power loss.

[0069] Figure 4 This is a rotor dynamic balancing disc. This part is made of non-magnetic metal. The dynamic balancing disc also has 24 dynamic balancing holes. The holes are set at 15° intervals. The denser the holes are, the better the imbalance on the rotor can be dispersed. It is equipped with small-diameter internal hexagonal flat-end set screws of different lengths (with thread adhesive) to adjust and disperse the imbalance by adding weight.

[0070] The present invention also provides an electric motor, which includes the aforementioned motor rotor structure.

[0071] This invention solves the following technical problems:

[0072] 1. Poor dynamic balance of the motor rotor leads to high motor noise and vibration;

[0073] 2. During disassembly of the motor, the mating surfaces between the rotor and the shaft are rusted, making disassembly difficult;

[0074] 3. The motor rotor is heavy and has a large moment of inertia, which leads to unstable motor deceleration.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention.

Claims

1. A motor rotor structure, characterized in that: include: The rotating shaft (1), rotor bushing (2), dynamic balancing disc (3), first dynamic balancing component and second dynamic balancing component are provided. The rotor bushing (2) is sleeved on the outer periphery of the rotating shaft (1), and a flange (21) is provided at one axial end of the rotor bushing (2). The dynamic balancing disc (3) is provided at the other axial end of the rotor bushing (2), and at least one first dynamic balancing hole (4) is provided on the flange (21) extending in the axial direction. The first dynamic balancing component can be inserted into the first dynamic balancing hole (4). At least one second dynamic balancing hole (5) is provided on the dynamic balancing disc (3) extending in the axial direction. The second dynamic balancing component can be inserted into the second dynamic balancing hole (5). The rotor bushing (2) includes a bushing body (22), which is a cylindrical structure. The flange (21) is located at one axial end of the bushing body (22) and is fixed to the bushing body (22). The outer diameter of the flange (21) is larger than the outer diameter of the bushing body (22). The first dynamic balance hole (4) extends from one axial end of the flange (21) to the other axial end. A rotor end ring (6) is also fitted around the outer periphery of the bushing body (22). The rotor end ring (6) is connected to the axial end face of the flange (21). The first dynamic balance hole (4) is located on the radial side of the outer periphery of the bushing body (22) along the radial direction of the rotor bushing (2). A third dynamic balance hole is provided on the rotor end ring (6) extending axially. The third dynamic balance hole is opposite to the first dynamic balance hole (4), so that the first dynamic balance component can also be inserted into the third dynamic balance hole.

2. The motor rotor structure according to claim 1, characterized in that: The dynamic balancing disc (3) is sleeved on the outer periphery of the other axial end of the bushing body (22), and the outer diameter of the dynamic balancing disc (3) is larger than the outer diameter of the bushing body (22). The second dynamic balancing hole (5) passes through from one axial end of the dynamic balancing disc (3) to the other axial end.

3. The motor rotor structure according to claim 1, characterized in that: The axial end face of the flange (21) includes a first part and a second part. The first part is connected to the bushing body (22), and the second part is connected to the rotor end ring (6). The second part is located on the radial outer periphery of the first part. The first dynamic balancing component can pass through the first dynamic balancing hole (4) and the third dynamic balancing hole in sequence.

4. The motor rotor structure according to claim 1, characterized in that: Multiple magnets (7) are provided on the outer periphery of the bushing body (22) and between the rotor end ring (6) and the dynamic balance disc (3), and a protective sleeve (8) is provided on the outer periphery of the magnets (7).

5. The motor rotor structure according to claim 1, characterized in that: The dynamic balancing disc (3) and the rotor end ring (6) are both made of non-magnetic metal; and / or, the first dynamic balancing component and the second dynamic balancing component are both threaded components.

6. The motor rotor structure according to claim 1, characterized in that: The flange (21) is also provided with an oil injection hole (9) along the axial direction. The oil injection hole (9) is positioned opposite to the outer and inner circumferential surfaces of the bushing body (22) along the axial direction. The oil injection hole (9) extends from the axial end face of the flange (21) away from the bushing body (22) to the interior of the bushing body (22). The inner radial surface of the bushing body (22) is also provided with an oil groove (10). The oil groove (10) is formed by recessing from the inner radial surface of the bushing body (22) in a radially outward direction, so that the inner radial side of the oil groove (10) is connected to the rotating shaft (1), and the oil groove (10) is connected to the oil injection hole (9).

7. The motor rotor structure according to claim 6, characterized in that: Along the axial direction of the rotor bushing (2), the oil groove (10) is located between the rotor end ring (6) and the dynamic balance disk (3), and the oil injection hole (9) extends into the interior of the bushing body (22) at one end, which is also located between the rotor end ring (6) and the dynamic balance disk (3) and communicates with the oil groove (10).

8. The motor rotor structure according to claim 6, characterized in that: The oil tank (10) is an annular oil tank; there are at least two oil injection holes (9), at least one of which can introduce oil from outside the flange (21) and enter the oil tank (10), and at least one oil injection hole (9) is connected to the oil tank (10) and can be used to discharge the oil in the oil tank (10).

9. The motor rotor structure according to claim 8, characterized in that: When it is necessary to disassemble the rotor bushing (2) and the rotating shaft (1), the oil groove (10) is filled with oil, the oil injection hole (9) for draining oil is closed, and gas is introduced into the oil injection hole for injecting oil to separate the rotor bushing (2) and the rotating shaft (1).

10. The motor rotor structure according to claim 9, characterized in that: The inner wall of the oil injection hole (9) is provided with an internal thread, which can cooperate with the threaded part to control the opening and closing of the oil injection hole (9).

11. The motor rotor structure according to claim 6, characterized in that: The depth of the oil groove (10) along the radial direction of the rotor bushing (2) is 1~3mm, and the length of the oil groove (10) along the axial direction of the rotor bushing (2) is half of the axial length of the rotor bushing (2).

12. The motor rotor structure according to any one of claims 1-11, characterized in that: The flange (21) is a circular cylindrical structure. There are multiple first dynamic balancing holes (4), and the multiple first dynamic balancing holes (4) are spaced apart along the circumferential direction of the flange (21). There is at least one first dynamic balancing component, and the first dynamic balancing component can be set into the corresponding first dynamic balancing hole (4) according to the eccentric force of the motor rotor structure. The dynamic balancing disk (3) is a circular cylindrical structure. There are multiple second dynamic balancing holes (5), which are spaced apart along the circumferential direction of the dynamic balancing disk (3). There is at least one second dynamic balancing component, which can be set into the corresponding second dynamic balancing hole (5) according to the eccentric force of the motor rotor structure.

13. An electric motor, characterized in that: The motor rotor structure includes any one of claims 1-12.

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