Permanent magnet motor rotor and motor

Abstract

The utility model relates to a permanent magnet motor rotor and a motor. The permanent magnet motor rotor comprises a permanent magnet, a rotor screen sleeve, a rotating shaft and at least one rotor punching sheet, the permanent magnet is a hollow cylinder, a through hole penetrating in the axial direction of the permanent magnet is formed in the middle of the permanent magnet, and the radial cross section of the permanent magnet is of an annular structure. The rotor punching sheet is sleeved on the outer surface of the rotating shaft, and the rotor punching sheet is in interference fit with the rotating shaft; the permanent magnet is sleeved on the outer peripheral surface of the rotor punching sheet, and the permanent magnet is in transition fit with the rotor punching sheet; the rotor screen sleeve is sleeved outside the permanent magnet and the rotor punching sheet, and the permanent magnet is in transition fit with the rotor screen sleeve. Compared with an insertion block type permanent magnet, the permanent magnet disclosed by the utility model has the advantages that the magnetic field distribution is more uniform; in addition, connection is carried out in a sleeving and transition fit or interference fit mode, the connection mode reduces gaps and looseness between components, the structural strength and stability of the rotor are improved, the assembly mode is relatively simple, and the complexity and error rate in the assembly process can be reduced.

Description

Technical Field

[0001] The present disclosure relates to the field of motor rotor structures, and in particular to a permanent magnet motor rotor and a motor. Background Art

[0002] The permanent magnet motor rotor is a key component used in electric motors, which is mainly composed of permanent magnets, rotor cores, shafts and bearings. The permanent magnet motor rotor uses permanent magnets to generate a constant magnetic field, which interacts with the current in the stator to generate torque and drive the motor to rotate. Therefore, permanent magnets are an indispensable key component of permanent magnet motors and have an important impact on the performance, efficiency and stability of the motor.

[0003] After searching, it is known that in the prior art, for example, patent CN201310286622.0 discloses a new type of permanent magnet motor rotor, including a rotating shaft, permanent magnet material, a pressure ring, and a shaft retaining ring. The permanent magnet material is a composite permanent magnet material, composed of ferrite magnets and neodymium iron boron magnets. The permanent magnet material is divided into two forms: one is embedded: the permanent magnet motor rotor also includes silicon steel sheets, that is, the permanent magnet material is inserted in the silicon steel sheets, and the silicon steel sheets are sleeved on the rotating shaft; the other is surface-mounted: the permanent magnet motor rotor also includes a stainless steel sleeve, that is, the permanent magnet material is adhered to the outer diameter of the rotating shaft, and the stainless steel sleeve is sleeved on the permanent magnet material. The above-mentioned new type of permanent magnet motor rotor still has the following defects in practical applications:

[0004] First, the above-mentioned permanent magnetic material is a permanent magnet. One type is embedded, where the permanent magnetic material is inserted into a silicon steel sheet, and the silicon steel sheet is sleeved on a rotating shaft. This structure is complex to process, has poor sealing at both ends, is prone to leakage, and even causes oxidation and deformation of the internal components, resulting in reduced motor performance, and in severe cases, directly damaging the motor.

[0005] The other is the surface mount type, where the permanent magnet motor rotor also includes a stainless steel sleeve, the permanent magnet material is glued to the outer diameter of the shaft, and the stainless steel sleeve is sleeved on the permanent magnet material. There are two specific structures. The first is that the permanent magnet material is an inner and outer layer, the inner layer is a ferrite magnet, and the outer layer is a neodymium iron boron magnet. The inner and outer layers are fixed with glue, and the bottom surface of the ferrite magnet is glued to the shaft; the second is: the permanent magnet material is a ferrite magnet and a neodymium iron boron magnet arranged at intervals, the end faces of the two are fixed with glue, and the bottom surfaces of the two are glued to the shaft. In the first surface-mount structure, the inner and outer layers of permanent magnets need to be fixed with glue, which increases the complexity and cost of the manufacturing process. At the same time, it is difficult to ensure that the glue between the two layers is evenly and firmly bonded; and the glue may lose its viscosity in a high temperature environment, resulting in failure of the fixation between the inner and outer layers of permanent magnets; in the second surface-mount structure, due to the different magnetic properties of ferrite magnets and neodymium iron boron magnets, the staggered arrangement may lead to uneven magnetic field distribution, thereby affecting the torque stability and efficiency of the motor; since the permanent magnets are arranged at intervals, the gaps between them may weaken the overall strength of the rotor structure, especially when rotating at high speeds or subjected to external impacts, this structure may be more susceptible to damage; and the staggered arrangement of permanent magnets makes the rotor assembly process more complicated, and it is also more difficult when the permanent magnets need to be repaired or replaced. Utility Model Content

[0006] In order to solve the problems existing in the above-mentioned prior art, the purpose of the present disclosure is to provide a permanent magnet motor rotor and a motor. The permanent magnets of the permanent magnet motor rotor have a more uniform magnetic field distribution compared with the plug-in type permanent magnets; and are connected by sleeve and transition fit or interference fit, which reduces the gap and looseness between components, improves the structural strength and stability of the rotor, and the assembly method is relatively simple, which can reduce the complexity and error rate of the assembly process.

[0007] A permanent magnet motor rotor disclosed in the present disclosure comprises a permanent magnet, a rotor shield, a rotating shaft and at least one rotor punching sheet;

[0008] The permanent magnet is in a hollow cylindrical shape, a through hole is formed in the middle portion and penetrates the permanent magnet in the axial direction, and the radial cross section of the permanent magnet is in an annular structure;

[0009] The rotor punching sheet is sleeved on the outer surface of the rotating shaft, and the rotor punching sheet and the rotating shaft are interference fit;

[0010] The permanent magnet is sleeved on the outer circumference of the rotor punching, and the permanent magnet and the rotor punching are transitionally matched to form a structure in which the rotor punching and the permanent magnet are sequentially sleeved on the outside of the rotating shaft from the inside to the outside;

[0011] The rotor shield is sleeved outside the permanent magnet and the rotor punching, and the permanent magnet and the rotor shield are transitionally matched, so that the permanent magnet, the rotor shield, the rotating shaft and the rotor punching rotate synchronously.

[0012] Preferably, the permanent magnet and the rotor punching are provided with rotor covers at both ends of the axial direction, a first sealing ring is provided at the contact between the rotor cover and the rotor shield sleeve, and a second sealing ring is provided at the contact between the rotor cover and the rotating shaft.

[0013] Preferably, the rotor cover is provided with a sealing ring pressing sheet on a side away from the permanent magnet, for fastening the first sealing ring and the second sealing ring.

[0014] Preferably, a plurality of rotor punching sheets are stacked along the axial direction of the rotating shaft.

[0015] Preferably, the rotor punching sheets are made of silicon steel magnetic conductive material.

[0016] Preferably, the rotating shaft is made of ceramic material.

[0017] Preferably, the rotor shield is made of stainless steel.

[0018] Preferably, a buffer assembly is provided at one end of the rotor shield, and the buffer assembly is used to buffer thrust.

[0019] Preferably, the buffer assembly comprises a thrust ring sleeve, a thrust ring and a thrust ring pad, wherein the thrust ring sleeve is arranged on the outer peripheral surface of the rotating shaft and is located on a side of the rotor shield sleeve close to the matching end of the rotating shaft;

[0020] The thrust ring stock washer is sleeved on the outer circumferential surface of the rotating shaft and filled between the rotor shield and the thrust ring. The thrust ring sleeve is sleeved on the outside of the thrust ring and the thrust ring stock washer.

[0021] The present disclosure also provides a motor, comprising a casing and a permanent magnet motor stator, and also comprising the permanent magnet motor rotor as described above, wherein the permanent magnet motor stator and the permanent magnet motor rotor are both arranged in the casing, the permanent magnet motor stator is sleeved on the outer surface of the permanent magnet motor rotor, and the permanent magnet motor stator and the permanent magnet motor rotor form a rotational connection.

[0022] The advantages of a permanent magnet motor rotor and a motor disclosed in the present invention are:

[0023] 1. A permanent magnet motor rotor disclosed in the present invention comprises a permanent magnet, a rotor shield, a rotating shaft and at least one rotor punching sheet; the permanent magnet is in a hollow cylindrical shape, a through hole is formed in the middle portion thereof and passes through the permanent magnet in the axial direction, and the radial cross section of the permanent magnet is in an annular structure; the rotor punching sheet is sleeved on the outer surface of the rotating shaft, and the rotor punching sheet and the rotating shaft have an interference fit; the permanent magnet is sleeved on the outer circumferential surface of the rotor punching sheet, and the permanent magnet and the rotor punching sheet have a transition fit, forming a structure in which the rotor punching sheet and the permanent magnet are sequentially sleeved on the outside of the rotating shaft from the inside to the outside; the rotor shield is sleeved on the outside of the permanent magnet and the rotor punching sheet, and the permanent magnet and the rotor shield are transitionally fitted, so that the permanent magnet, the rotor shield, the rotating shaft and the rotor punching sheet rotate synchronously. Compared with the plug-in type permanent magnet, the permanent magnet of the above structure has a more uniform magnetic field distribution; and it is connected by sleeve and transition fit or interference fit. This connection method reduces the gap and looseness between components, improves the structural strength and stability of the rotor, and the assembly method is relatively simple, which can reduce the complexity and error rate in the assembly process; and the transition fit or interference fit is a tight connection achieved by physical means, without the use of any glue or adhesive, so it usually provides a higher connection strength, is more able to withstand large torque and vibration, and does not rely on the performance of the adhesive, so it has better thermal stability and avoids connection problems caused by aging or failure of the adhesive. This makes the interference fit have a longer service life and reduces the need for repair and replacement due to connection problems.

[0024] 2. A permanent magnet motor rotor disclosed in the present invention has rotor glands at both ends of the permanent magnet, a first sealing ring is provided at the contact between the rotor gland and the rotor shield, and a second sealing ring is provided at the contact between the rotor gland and the rotating shaft. The addition of the sealing ring ensures the sealing between the rotor gland, the rotor shield and the rotating shaft, which can reduce the leakage of oil or impurities entering the rotor during operation, and ensure the stability and durability of the rotor for long-term operation.

[0025] 3. A buffer assembly is provided at one end of the rotor shield of a permanent magnet motor rotor disclosed in the present invention, and the buffer assembly is used to buffer thrust; the buffer assembly includes a thrust ring sleeve, a thrust ring and a thrust ring stock pad, the thrust ring sleeve is arranged on the outer peripheral surface of the rotating shaft, and is located on the side of the rotor shield sleeve close to the matching end of the rotating shaft; the thrust ring stock pad is sleeved on the outer peripheral surface of the rotating shaft and filled between the rotor shield sleeve and the thrust ring, and the thrust ring sleeve is sleeved on the outside of the thrust ring and the thrust ring stock pad. By providing the buffer assembly, the buffer assembly can effectively buffer the thrust generated by the rotor during operation, and the thrust is evenly distributed to the entire assembly through the structure of the thrust ring and the thrust ring stock pad, thereby avoiding damage or failure caused by excessive force on a single point, thereby protecting the permanent magnet and reducing the situation where the permanent magnet is damaged due to excessive force.

[0026] 4. A motor disclosed in the present invention includes a housing and a permanent magnet motor stator, and also includes the permanent magnet motor rotor as described above, wherein the permanent magnet motor stator and the permanent magnet motor rotor are both arranged in the housing, the permanent magnet motor stator is sleeved on the outer surface of the permanent magnet motor rotor, and the permanent magnet motor stator and the permanent magnet motor rotor form a rotational connection. The permanent magnet motor rotor of the above motor has a uniform magnetic field distribution, and this uniformity helps to achieve stability and low noise during motor operation, while improving the efficiency of energy conversion. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a cross-sectional view of a permanent magnet motor rotor described in the present disclosure;

[0028] Figure 2 is a schematic diagram of a permanent magnet motor stator structure of a motor disclosed in the present invention;

[0029] Figure 3 It is a cross-sectional view of a motor described in the present disclosure.

[0030] Description of reference numerals:

[0031] 10-Permanent magnet;

[0032] 20- rotor screen;

[0033] 30-rotating shaft;

[0034] 40- rotor punching;

[0035] 50-rotor gland;

[0036] 60-first sealing ring;

[0037] 70- second sealing ring;

[0038] 80-seal ring pressing piece;

[0039] 90-buffer assembly; 901-thrust ring sleeve; 902-thrust ring; 903-thrust ring stock pad;

[0040] 100-stator punching body; 1001-inner circular hole; 1002-through slot; 1003-threading slot; 1004-thread hanging rib;

[0041] 110- stator jacket;

[0042] 120-coil winding;

[0043] 130- impeller;

[0044] 140-Ceramic bearings;

[0045] 150-power cord;

[0046] 160-ceramic ring;

[0047] 170-Case. DETAILED DESCRIPTION

[0048] like Figure 1 - Figure 3 As shown, a permanent magnet motor rotor disclosed in the present disclosure includes a permanent magnet 10, a rotor shield 20, a rotating shaft 30 and at least one rotor punching sheet 40;

[0049] The permanent magnet 10 is in a hollow cylindrical shape, with a through hole formed in the middle thereof penetrating the permanent magnet 10 in the axial direction, and the radial cross section of the permanent magnet 10 is in an annular structure;

[0050] The rotor punching 40 is sleeved on the outer surface of the rotating shaft 30, and the rotor punching 40 and the rotating shaft 30 are interference fit;

[0051] The permanent magnet 10 is sleeved on the outer circumference of the rotor punching 40, and the permanent magnet 10 and the rotor punching 40 are transitionally matched to form a structure in which the rotor punching 40 and the permanent magnet 10 are sequentially sleeved on the outside of the rotating shaft 30 from the inside to the outside;

[0052] The rotor shield 20 is sleeved outside the permanent magnet 10 and the rotor punching 40, and the permanent magnet 10 and the rotor shield 20 are transitionally matched, so that the permanent magnet 10, the rotor shield 20, the rotating shaft 30 and the rotor punching 40 rotate synchronously;

[0053] The connection is made by sleeve and transition fit or interference fit. This connection method reduces the gap and looseness between parts, improves the structural strength and stability of the rotor, and is relatively simple to assemble, which can reduce the complexity and error rate in the assembly process. Transition fit or interference fit is a tight connection achieved by physical means, without the use of any glue or adhesive. Therefore, it usually provides a higher connection strength, is more able to withstand large torque and vibration, and is not dependent on the performance of the adhesive, so it has better thermal stability and avoids connection problems caused by aging or failure of the adhesive. This makes the interference fit have a longer service life and reduces the need for repair and replacement due to connection problems.

[0054] Further, in the present embodiment, the permanent magnet 10 and the rotor punching 40 are provided with a rotor pressure cover 50 at both ends of the axial direction, and a first sealing ring 60 is provided at the contact between the rotor pressure cover 50 and the rotor screen sleeve 20, and a second sealing ring 70 is provided at the contact between the rotor pressure cover 50 and the rotating shaft 30; the first sealing ring 60 provided at the contact between the rotor pressure cover 50 and the rotor screen sleeve 20 is a screen sleeve sealing ring, and the second sealing ring 70 provided at the contact between the rotor pressure cover 50 and the rotating shaft 30 is a shaft sealing ring, and both the screen sleeve sealing ring and the shaft sealing ring can adopt high temperature resistant, corrosion resistant and highly elastic silicone sealing rings, the type of the screen sleeve sealing ring can be selected from an O-type sealing ring or a U-type sealing ring, and the type of the shaft sealing ring can be selected from a lip sealing ring or a spiral groove sealing ring;

[0055] The addition of the sealing ring ensures the sealing between the rotor cover 50 and the rotor shield 20 and the rotating shaft 30, which can reduce the leakage of oil or the entry of impurities into the rotor during operation, and ensure the stability and durability of the rotor during long-term operation.

[0056] Furthermore, in the present embodiment, the rotor cover 50 is provided with a sealing ring pressing sheet 80 on the side away from the permanent magnet 10, which is used to fasten the first sealing ring 60 and the second sealing ring 70 to reduce the possibility of the sealing ring 60 falling off; the side of the sealing ring pressing sheet 80 away from the first sealing ring 60 and the second sealing ring 70 is in contact with the rotor screen sleeve 20 to fasten the sealing ring pressing sheet 80 through the end of the rotor screen sleeve 20.

[0057] Furthermore, in this embodiment, a plurality of rotor punching sheets 40 are stacked in the axial direction, and the stacking thickness is less than or equal to the axial length of the permanent magnet 10 .

[0058] Furthermore, in this embodiment, the rotor punching 40 is made of silicon steel magnetic conductive material; silicon steel magnetic conductive material has excellent magnetic conductivity and can effectively transmit and enhance the magnetic field; the use of silicon steel magnetic conductive material can ensure that the magnetic field is efficiently transmitted inside the rotor, reduce magnetic resistance and magnetic leakage, and effectively protect the magnetism of the permanent magnet 10, thereby improving the magnetic energy utilization and efficiency of the motor; silicon steel magnetic conductive material has low hysteresis loss and eddy current loss, which means that during the operation of the motor, the energy loss caused by the material itself is small, which helps to reduce the heat and energy consumption of the motor and improve the overall operation efficiency; silicon steel magnetic conductive material not only has excellent magnetic conductivity, but also has good mechanical strength and toughness. This enables the rotor punching to withstand various forces and vibrations during the operation of the motor and maintain the stability and reliability of the structure.

[0059] Furthermore, in the present embodiment, the shaft 30 is made of ceramic material; the ceramic shaft made of ceramic material can resist wear and corrosion when running at high speed due to its high hardness and good chemical stability, and has excellent wear resistance and corrosion resistance, thereby extending the service life; the ceramic material has excellent thermal conductivity, which helps the motor to dissipate heat when running at high load and ensure the stability of the motor operation; the low friction coefficient of the ceramic material helps to reduce friction loss during motor operation and improve energy conversion efficiency.

[0060] Furthermore, in the present embodiment, the rotor shield 20 is made of stainless steel material; stainless steel material has excellent strength and toughness, and can withstand various stresses and vibrations generated during the operation of the motor, which enables the rotor shield 20 to effectively protect key components inside the motor, such as the permanent magnet 10, from external impact and damage; stainless steel material also has good thermal conductivity, which helps to effectively dissipate the heat generated by the motor during operation. By reducing heat accumulation, the stainless steel rotor shield helps to maintain the temperature of the motor stable and prevent performance degradation or failure due to overheating.

[0061] Furthermore, in this embodiment, a buffer assembly 90 is provided at one end of the rotor shield 20, and the buffer assembly 90 is used to buffer thrust; the buffer assembly 90 is specifically located at the end close to the connection between the rotating shaft 30 and other components, that is, close to the mating end of the rotating shaft 30.

[0062] Furthermore, in this embodiment, the buffer assembly 90 includes a thrust ring sleeve 901, a thrust ring 902 and a thrust ring stock pad 903. The thrust ring 902 is sleeved on the outer circumferential surface of the rotating shaft 30 and is located on the side of the rotor shield sleeve 20 close to the mating end of the rotating shaft 30; the mating end of the rotating shaft 30 is the end of the rotating shaft 30 that needs to be connected to other components;

[0063] The thrust ring stock pad 903 is sleeved on the outer circumferential surface of the rotating shaft 30 and filled between the rotor screen sleeve 20 and the thrust ring 902. The thrust ring sleeve 901 is sleeved on the outside of the thrust ring 902 and the thrust ring stock pad 903.

[0064] By providing the buffer assembly 90, the buffer assembly 90 can effectively buffer the thrust generated by the rotor during operation, and evenly disperse the thrust to the entire assembly through the structure of the thrust ring 902 and the thrust ring pad 903, thereby avoiding damage or failure caused by excessive force on a single point, thereby protecting the permanent magnet 10 and reducing the situation where the permanent magnet 10 is damaged due to excessive force.

[0065] The embodiment of the present disclosure further provides a motor, comprising a housing 170 and a permanent magnet motor stator, and also comprising the permanent magnet motor rotor as described above, wherein the permanent magnet motor stator and the permanent magnet motor rotor are both arranged in the housing 170, the permanent magnet motor stator is sleeved on the outer surface of the permanent magnet motor rotor, and the permanent magnet motor stator and the permanent magnet motor rotor form a rotational connection; the permanent magnets of the permanent magnet motor rotor have a uniform magnetic field distribution, and this uniformity helps to achieve stability and low noise during motor operation, while improving the efficiency of energy conversion;

[0066] The stator of the permanent magnet motor includes a stator punching sheet, and the stator punching sheet includes at least one stator punching sheet body 100, the stator punching sheet body 100 is in a hollow annular shape, and has a hollow inner circular hole 1001 in the middle, and a plurality of through slots 1002 penetrating along the thickness direction of the stator punching sheet body 100 are formed on the outer side of the inner circular hole 1001, and the plurality of through slots 1002 are arranged in a circular array around the center of the stator punching sheet body 100, and a threading slot 1003 is formed between each through slot 1002 and the inner circular hole 1001 to connect the through slot 1002 with the inner circular hole 11, and a wire hanging rib 1004 is formed between every two adjacent through slots 1002;

[0067] The outer diameter of the stator punch body 100 is 106±1mm, the diameter of the inner hole 1001 is 57±1mm, the number of through slots 1002 is specifically 9, which are arranged at equal angles around the center of the stator punch body 100, and the through slots 1002 are arc-bottomed trapezoidal, that is, the upper bottom and the lower bottom are both arcs, the diameter of the lower bottom is 93±1mm, and the diameter of the upper bottom is 61±1mm;

[0068] The threading groove 1003 is a strip groove, one end of which is connected to the inner circular hole 1001, and the other end is connected to the through groove 1002, so that the through groove 1002 is connected to the inner circular hole 1001. The width of the threading groove 1003 is 2.9 mm to 3.1 mm, preferably 3 mm.

[0069] Between every two adjacent through slots 1002 is a wire hanging rib 1004, the width of the wire hanging rib 1004 is 7.9 mm to 8.1 mm, preferably 8 mm. The angle formed by the midlines of two adjacent wire hanging ribs 1004 is 40°;

[0070] The power of the motor is mainly affected by the thickness of the stator sheet. In this embodiment, the number of the stator sheet bodies 100 is a plurality of sheets, and the plurality of stator sheet bodies 100 are stacked in the thickness direction and connected sheet by sheet to form a stator sheet. In a specific embodiment, the thickness of the stator sheet is 15 mm, 20 mm, 30 mm, 40 mm or 50 mm to meet different power requirements.

[0071] The motor also includes a stator sleeve 110, a coil winding 120, an impeller 130, a ceramic bearing 140, a power cord 150 and a ceramic ring 160; during operation, the motor may generate higher friction and heat, and the stator sleeve 110 is used to protect the permanent magnet motor stator and the permanent magnet motor rotor; the impeller 130 is rotatably connected to the end of the rotating shaft 30 exposed from the casing 170; the ceramic bearing 140 is sleeved on the outer surface near the end of the rotating shaft 30, and the ceramic ring 160 is sleeved on the outer surface of the ceramic bearing 140; the power cord 150 is used to connect to the power supply to provide electrical energy to the motor.

[0072] In summary, the permanent magnet motor rotor has a hollow cylindrical shape, a through hole is formed in the middle part along the axial direction of the permanent magnet 10, and the radial cross section of the permanent magnet 10 is annular in structure. Compared with the plug-in type permanent magnet, its magnetic field distribution is more uniform; and the rotor punching 40 is sleeved on the outer surface of the rotating shaft 30, and the rotor punching 40 and the rotating shaft 30 are interference fit; the permanent magnet 10 is sleeved on the outer peripheral surface of the rotor punching 40, and the permanent magnet 10 and the rotor punching 40 are transitionally matched, forming the rotor punching 40 and the permanent magnet 10 from the inside to the outside The structure is sequentially sleeved on the outside of the rotating shaft 30; the rotor screen sleeve 20 is sleeved on the outside of the permanent magnet 10 and the rotor punching 40, and the permanent magnet 10 and the rotor screen sleeve 20 are transitionally fitted, so that the permanent magnet 10, the rotor screen sleeve 20, the rotating shaft 30 and the rotor punching 40 rotate synchronously, and are connected by sleeve and transition fit or interference fit. This connection method reduces the gap and looseness between the components, improves the structural strength and stability of the rotor, and the assembly method is relatively simple, which can reduce the complexity and error rate of the assembly process.

[0073] The motor includes a housing 170 and a permanent magnet motor stator, and also includes the permanent magnet motor rotor as described above. The permanent magnets of the permanent magnet motor rotor have a uniform magnetic field distribution, which helps to achieve smoothness and low noise during motor operation and improve the efficiency of energy conversion.

[0074] In the description of the present disclosure, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present disclosure and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present disclosure.

[0075] For those skilled in the art, various other corresponding changes and deformations can be made according to the technical solutions and concepts described above, and all of these changes and deformations should fall within the protection scope of the claims of the present disclosure.

Claims

1. A permanent magnet motor rotor, characterized in that: It comprises a permanent magnet (10), a rotor shield (20), a rotating shaft (30) and at least one rotor punching sheet (40); The permanent magnet (10) is in the shape of a hollow cylinder, a through hole is formed in the middle thereof and penetrates the permanent magnet (10) in the axial direction, and the radial cross section of the permanent magnet (10) is in the shape of an annular structure; The rotor punching sheet (40) is sleeved on the outer surface of the rotating shaft (30), and the rotor punching sheet (40) and the rotating shaft (30) are interference fit; The permanent magnet (10) is sleeved on the outer peripheral surface of the rotor punching (40), and the permanent magnet (10) and the rotor punching (40) are transitionally matched to form a structure in which the rotor punching (40) and the permanent magnet (10) are sequentially sleeved on the outside of the rotating shaft (30) from the inside to the outside; The rotor shield (20) is sleeved outside the permanent magnet (10) and the rotor punching (40), and the permanent magnet (10) and the rotor shield (20) are transitionally matched, so that the permanent magnet (10), the rotor shield (20), the rotating shaft (30) and the rotor punching (40) rotate synchronously.

2. The permanent magnet motor rotor according to claim 1, characterized in that: The permanent magnet (10) and the rotor punching (40) are both provided with rotor covers (50) at both ends in the axial direction, a first sealing ring (60) is provided at the contact point between the rotor cover (50) and the rotor shield sleeve (20), and a second sealing ring (70) is provided at the contact point between the rotor cover (50) and the rotating shaft (30).

3. The permanent magnet motor rotor according to claim 2, characterized in that: The rotor cover (50) is provided with a sealing ring pressing sheet (80) on a side away from the permanent magnet (10) for fastening the first sealing ring (60) and the second sealing ring (70).

4. The permanent magnet motor rotor according to claim 1, characterized in that: A plurality of rotor punching sheets (40) are stacked and arranged along the axial direction of the rotating shaft (30).

5. The permanent magnet motor rotor according to claim 1, characterized in that: The rotor punching sheet (40) is made of silicon steel magnetic conductive material.

6. The permanent magnet motor rotor according to claim 1, characterized in that: The rotating shaft (30) is made of ceramic material.

7. The permanent magnet motor rotor according to claim 1, characterized in that: The rotor shield (20) is made of stainless steel.

8. The permanent magnet motor rotor according to claim 1, characterized in that: A buffer component (90) is provided at one end of the rotor shield (20), and the buffer component (90) is used to buffer thrust.

9. The permanent magnet motor rotor according to claim 8, characterized in that: The buffer assembly (90) comprises a thrust ring sleeve (901), a thrust ring (902) and a thrust ring washer (903); the thrust ring (902) is sleeved on the outer circumferential surface of the rotating shaft (30) and is located on a side of the rotor shield sleeve (20) close to the mating end of the rotating shaft (30); The thrust ring washer (903) is sleeved on the outer circumferential surface of the rotating shaft (30) and filled between the rotor screen sleeve (20) and the thrust ring (902), and the thrust ring sleeve (901) is sleeved on the outside of the thrust ring (902) and the thrust ring washer (903).

10. A motor, comprising a housing (170) and a permanent magnet motor stator, characterized in that: It also includes the permanent magnet motor rotor as described in any one of claims 1 to 9, wherein the permanent magnet motor stator and the permanent magnet motor rotor are both arranged in the casing (170), the permanent magnet motor stator is sleeved on the outer surface of the permanent magnet motor rotor, and the permanent magnet motor stator and the permanent magnet motor rotor form a rotational connection.

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