Rotor of an electric machine and electric machine

Abstract

The application discloses a rotor of a motor and the motor. The rotor comprises a rotor core and a permanent magnet arranged on the rotor core. The rotor core comprises a plurality of laminations which are of the same shape, stacked and coaxially arranged. The lamination is formed with a rotating shaft mounting hole, a plurality of rotating shaft key slot holes and a plurality of air duct holes. The plurality of rotating shaft key slot holes and the plurality of air duct holes are arranged at intervals along the circumferential direction of the rotating shaft mounting hole. The upper lamination of the plurality of laminations is arranged in an offset manner relative to the lower lamination, so that the air duct holes of the plurality of laminations jointly form a spiral air duct, and the rotating shaft key slot holes of the upper lamination and the lower lamination are aligned along the axial direction of the rotating shaft mounting hole. By arranging the spiral air duct in the rotor, the air in the spiral air duct can form a pressure difference in the axial direction of the rotor during rotation of the rotor, thereby forming an air flow, and the heat in the motor can be taken out, so that the motor can be rapidly cooled, and the permanent magnet is protected from demagnetization risk.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a rotor of an electric machine and the electric machine. BACKGROUND

[0002] As a kind of driving device, electric machine has been widely used in various robots, household appliances, industrial and other electric devices.In the field of electric machine, permanent magnet servo motor occupies most of the market of servo motor due to its high torque density, high efficiency and other advantages.

[0003] The present application relates to the technical field of electric machines, in particular to a rotor of an electric machine and the electric machine. SUMMARY

[0004] The present application provides a rotor of an electric machine and the electric machine to solve the technical problem of poor heat dissipation of the permanent magnet electric machine of the inner rotor in the prior art.

[0005] To solve the above technical problems, one technical solution adopted by the present application is to provide a rotor of an electric machine, comprising:

[0006] The rotor core comprises a plurality of identical and coaxially stacked laminations, a plurality of shaft key slot holes and a plurality of air duct holes are formed on the laminations, the plurality of shaft key slot holes are in communication with the shaft mounting hole and are arranged along the circumferential direction of the shaft mounting hole, the plurality of air duct holes are arranged along the circumferential direction of the shaft mounting hole, and the upper layer of laminations is offset from the lower layer of laminations, so that the air duct holes of the plurality of laminations form a spiral air duct, and the shaft key slot holes of the upper layer of laminations and the lower layer of laminations are aligned along the axial direction of the shaft mounting hole.

[0007] A plurality of permanent magnets are arranged on the rotor core.

[0008] In a specific embodiment, a plurality of magnetic pole mounting grooves are further formed on the laminations, and the plurality of magnetic pole mounting grooves are respectively used to mount the plurality of permanent magnets, and the number of shaft key slot holes is equal to the number of magnetic pole pairs of the plurality of permanent magnets.

[0009] In an embodiment, the angle of the upper one of the plurality of laminations offsetting relative to the lower one of the plurality of laminations is m times the angle corresponding to the number of pole pairs, where m is a natural number, so that the shaft key hole, the pole mounting slot of the upper one of the plurality of laminations and the lower one of the plurality of laminations are aligned along the axial direction of the shaft mounting hole.

[0010] In an embodiment, the angle of the upper one of the plurality of laminations offsetting relative to the lower one of the plurality of laminations is m times the angle corresponding to the number of pole pairs, where m is a natural number, so that the shaft key hole, the pole mounting slot of the upper one of the plurality of laminations and the lower one of the plurality of laminations are aligned along the axial direction of the shaft mounting hole.

[0011] In an embodiment, the number of pole pairs of the permanent magnet and the number of air channel holes of the lamination satisfy: n×P=m×S±1, where n is a natural number.

[0012] In an embodiment, the angle of the upper one of the plurality of laminations offsetting relative to the lower one of the plurality of laminations is m times the angle corresponding to the number of pole pairs, where m is a natural number, so that the shaft key hole, the pole mounting slot of the upper one of the plurality of laminations and the lower one of the plurality of laminations are aligned along the axial direction of the shaft mounting hole.

[0013] In an embodiment, the difference between the number of air channel holes and the number of poles of the permanent magnet is 2, 4 or 7.

[0014] In an embodiment, the number of air channel holes of the lamination and the integer multiple of the number of pole pairs of the permanent magnet are not equal, so that the air channel holes of the plurality of laminations can collectively form the spiral air channel.

[0015] To solve the above technical problems, another technical solution adopted by the present application is to provide an electric machine, comprising:

[0016] a housing;

[0017] a shaft penetrating through the housing;

[0018] a rotor sleeved on the shaft and located in the housing, the rotor being the rotor as described above;

[0019] a stator sleeved outside the rotor and located in the housing, the stator being spaced apart from the rotor, the stator abutting against the housing, and a plurality of air channel grooves being formed on the inner side wall of the housing and uniformly distributed along the circumferential direction of the housing.

[0020] In a specific embodiment, the shell is formed with an air inlet and an air outlet, the air inlet is located at the bottom end of the shell, and the air outlet is located at one side of the air inlet close to the top end of the shell, so that the air flow can enter the shell from the air inlet, flow to the space between the rotor and the stator through the spiral air duct, flow to the air duct groove, and flow out from the air outlet.

[0021] The rotor of the motor comprises a rotor core and a permanent magnet arranged on the rotor core. The rotor core comprises a plurality of laminated and coaxially arranged laminations with the same shape. The laminations are formed with a rotating shaft mounting hole, a plurality of rotating shaft key slot holes and a plurality of air duct holes. The rotating shaft key slot holes are in communication with the rotating shaft mounting hole and are arranged at intervals along the circumferential direction of the rotating shaft mounting hole. The air duct holes are arranged at intervals along the circumferential direction of the rotating shaft mounting hole. The laminations are arranged in an offset manner with respect to each other, so that the air duct holes of the laminations form a spiral air duct, and the rotating shaft key slot holes of the laminations are aligned along the axial direction of the rotating shaft mounting hole. The spiral air duct arranged in the rotor can form a pressure difference in the axial direction of the rotor during rotation of the rotor, thereby forming an air flow, and the heat in the motor can be discharged, the motor can be rapidly cooled, the permanent magnet can be protected from demagnetization, and the weight of the rotor can be reduced, thereby reducing the rotational inertia of the rotor and facilitating rapid start and braking of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0023] Figure 1 is a perspective structural schematic diagram of an embodiment of the rotor of the motor of the present application;

[0024] Figure 2 is a perspective structural schematic diagram of an embodiment of the rotor of the motor of the present application;

[0025] Figure 3 is a top view structural schematic diagram of a lamination in an embodiment of the rotor of the motor of the present application;

[0026] Figure 4 is a sectional view structural schematic diagram of an embodiment of the motor of the present application;

[0027] Figure 5 is a top view structural schematic diagram of an embodiment of the motor of the present application;

[0028] Figure 6is a sectional structure schematic diagram of another embodiment of the motor of the application. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the application will be clearly and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all the other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the application.

[0030] The terms "first", "second", etc. in the application are only used for description purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device including a series of steps or units is not limited to the listed steps or units, but can optionally include steps or units not listed, or can optionally include other steps or units inherent to the process, method, product or device. And the term "and / or", is only a description of the association between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects have an "or" relationship.

[0031] Reference Figures 1 to 3The rotor 10 of the motor of the present application comprises a rotor core 100 and a plurality of permanent magnets 200 arranged on the rotor core 100, and the rotor core 100 comprises a plurality of laminated and coaxially arranged laminations 110, the lamination 110 is provided with a rotating shaft mounting hole 111, a plurality of rotating shaft key groove holes 112 and a plurality of air channel holes 113, the plurality of rotating shaft key groove holes 112 are in communication with the rotating shaft mounting hole 111 and are arranged at intervals along the circumferential direction of the rotating shaft mounting hole 111, the plurality of air channel holes 113 are arranged at intervals along the circumferential direction of the rotating shaft mounting hole 111, the upper lamination 110 in the plurality of laminations 110 is arranged in an offset manner relative to the lower lamination 110, so that the air channel holes 113 of the plurality of laminations 110 jointly form a spiral air channel, and the rotating shaft key groove holes 112 of the upper lamination 110 and the lower lamination 110 are aligned along the axial direction of the rotating shaft mounting hole 111, thereby being capable of not affecting the installation of the rotating shaft key (not shown in the figure), and the spiral air channel arranged in the rotor 10 can form a pressure difference in the axial direction of the rotor 10 during the rotation of the rotor 10, thereby forming an air flow, which can carry out the heat in the motor, realize the rapid heat dissipation of the motor, protect the permanent magnet 200 from demagnetization risk, and also can reduce the weight of the rotor 10, thereby reducing the moment of inertia of the rotor 10, which is beneficial to the rapid start and rapid braking of the motor.

[0032] In the present embodiment, the rotating shaft mounting hole 111 is circularly arranged, which can facilitate assembly with the rotating shaft (not shown in the figure), and facilitate alignment along the axial direction of the rotating shaft mounting hole 111 when the plurality of laminations 110 are laminated, so as to be pressed into the rotor core 100.

[0033] In the present embodiment, the rotating shaft key groove hole 112 is square, a plurality of rotating shaft key groove holes 112 on the same lamination 110 are uniformly arranged at intervals along the circumferential direction of the rotating shaft mounting hole 111, and the alignment of the rotating shaft key groove holes 112 on the plurality of laminations 110 in the axial direction can realize accurate positioning when the laminations 110 are laminated, and can cooperate with the straight strip-shaped rotating shaft key on the rotating shaft to limit the rotor core 100, so that the rotor core 100 is not easy to slide relative to the rotating shaft during the rotation of the rotor 10, the structure of the rotor 10 is more stable, the reliability is higher, and the torque generated on the rotor 10 can be efficiently output to the rotating shaft through the rotating shaft key.

[0034] In other embodiments, the rotating shaft key groove hole 112 can be circular or trapezoidal or other shapes, which are not limited herein.

[0035] In the present embodiment, the plurality of air channel holes 113 and the rotating shaft key groove holes 112 are arranged at intervals along the radial direction of the rotating shaft mounting hole 111, so as to avoid interference with the rotating shaft key groove hole 112, causing the structure of the plurality of air channel holes 113 to be irregular, affecting the smoothness of the air flow in the spiral air channel.

[0036] In other embodiments, the air duct hole 113 can also be in communication with the shaft mounting hole 111 or the shaft key groove hole 112 to achieve direct heat dissipation of the shaft and improve the heat dissipation efficiency.

[0037] In the embodiment, the air duct hole 113 is arranged in a fan shape, which can make the ratio of the cross-sectional area of the air duct hole 113 in the radial direction of the shaft mounting hole 111 to the cross-sectional area of the laminated sheet 110 in the radial direction of the shaft mounting hole 111 larger, the air flow through the spiral air duct larger, and the heat dissipation effect better. In addition, the plurality of air duct holes 113 are uniformly spaced along the circumference of the shaft mounting hole 111, which can form a regular spiral air duct, so that the airflow in the spiral air duct flows more smoothly and the airflow speed is faster, further improving the heat dissipation effect.

[0038] In other embodiments, the air duct hole 113 can also be arranged in other shapes such as a circle, a square, or a trapezoid, etc., which are not limited herein.

[0039] In the embodiment, the side wall of the air duct hole 113 can also be smoothed by spraying or fusion injection, etc., which can make the air flow in the air duct hole 113 more smoothly, the heat dissipation speed faster, and the heat dissipation effect better.

[0040] In the embodiment, the structures of the plurality of laminated sheets 110 are completely the same, which can be processed by the same mold, facilitating batch processing, and making the processing difficulty and cost lower.

[0041] In the embodiment, the number of the air duct hole 113 of the laminated sheet 110 is not equal to an integer multiple of the number of the magnetic pole pairs of the permanent magnet 200, which can make the projection of the solid part of the upper laminated sheet 110 and the air duct hole 113 of the lower laminated sheet 110 in the axial direction of the shaft mounting hole 111 at least partially overlap, and further make the air duct holes 113 of the plurality of laminated sheets 110 form a spiral air duct together.

[0042] In the embodiment, a plurality of magnetic pole mounting grooves 114 are further formed on the laminated sheet 110, the plurality of magnetic pole mounting grooves 114 are respectively used for mounting the plurality of permanent magnets 200, and the number of the shaft key groove hole 112 is equal to the number of the magnetic pole pairs of the plurality of permanent magnets 200 (i.e. 1 / 2 of the number of the permanent magnets 200), so that when the shaft key groove hole 112 of the upper laminated sheet 110 and the shaft key groove hole 112 of the lower laminated sheet 110 in the plurality of laminated sheets 110 are aligned in the axial direction of the shaft mounting hole 111, the magnetic pole mounting groove 114 of the upper laminated sheet 110 and the magnetic pole mounting groove 114 of the lower laminated sheet 110 are also aligned in the axial direction of the shaft mounting hole 111, and further the permanent magnet 200 can be mounted on the rotor core 100.

[0043] In the embodiment, the magnetic pole mounting groove 114 is formed on the outer surface of the lamination 110, facilitating the interaction between the rotor 10 and the stator (not shown) outside, and realizing the rotation of the rotor 10 relative to the stator.

[0044] In other embodiments, the magnetic pole mounting groove 114 can also be formed in the lamination 110, which is not limited here.

[0045] In other embodiments, the lamination 110 can also not be provided with the magnetic pole mounting groove, and the permanent magnet 200 is directly fixed on the outer surface of the rotor core 100 by welding, sticking or buckling, etc., which is not limited here.

[0046] In the embodiment, the angle of the upper lamination 110 in the plurality of laminations 110 relative to the lower lamination 110 is m times the angle corresponding to the number of magnetic pole pairs, where m is a natural number, so that the shaft key slot hole 112 and the magnetic pole mounting groove 114 of the upper lamination 110 and the lower lamination 110 in the plurality of laminations 110 are aligned along the axial direction of the shaft mounting hole 111.

[0047] Specifically, taking Figure 3 for example, the number of magnetic pole pairs of the permanent magnet 200 in the embodiment is 5, and the angle corresponding to the number of magnetic pole pairs is 360° / 5=72°, and the angle of the upper lamination 110 relative to the lower lamination 110 is m×72°, so that the shaft key slot hole 112 and the magnetic pole mounting groove 114 of the two laminations 110 are aligned along the axial direction of the shaft mounting hole 111. In this way, each lamination 110 is assembled relative to the lower lamination 110 in the same direction (counterclockwise or clockwise) by m×72°, so that the rotor core 100 formed by pressing the plurality of laminations 110 can form a spiral air duct, and the shaft key slot hole 112 and the magnetic pole mounting groove 114 of the plurality of laminations 110 are aligned along the axial direction of the shaft mounting hole 111, and the installation of the shaft and the permanent magnet 200 can be realized.

[0048] In the embodiment, the angle of the air duct hole 113 of the upper lamination 110 in the plurality of laminations 110 relative to the air duct hole 113 of the lower lamination 110 connected thereto is Δθ=360°×(m×S / P-k) / S, where S is the number of air duct holes 113 of the lamination 110, P is the number of magnetic pole pairs of the permanent magnet 200, and k is the integer value after rounding off of m×S / P. Wherein, when the calculation result of Δθ is positive, it means that the air duct hole 113 is offset in the same direction relative to the lamination 110, and when the calculation result of Δθ is negative, it means that the air duct hole 113 is offset in the opposite direction relative to the lamination 110.

[0049] In the embodiment, the number P of pole pairs of the permanent magnet 200 and the number S of the air channel holes 113 of the laminations 110 satisfy n×P=m×S±1, where n is a natural number, so that the overlapping area of the air channel holes 113 of the adjacent two layers of laminations 110 is larger, the area of the cross section of the spiral air channel of the rotor core 100 along the radial direction of the rotation shaft mounting hole 111 is larger, the air flow through the spiral air channel is larger, and the heat dissipation effect is better.

[0050] In the embodiment, when the number S of the air channel holes 113 satisfies n×P=m×S±1, the air channel holes 113 of the upper layer of laminations 110 in the plurality of laminations 110 are offset from the air channel holes 113 of the lower layer of laminations 110 which are in communication with the air channel holes 113 of the upper layer of laminations 110 by an angle Δθ=±360° / (P×S).

[0051] In the embodiment, the difference between the number S of the air channel holes 113 and the number 2×P of the number of pole pairs of the permanent magnet 200 is 2, 4, or 7, etc., so that the number of the air channel holes 113 of the laminations 110 and the number of the rotation shaft key groove holes 112 can achieve a better matching effect, the volume of the spiral air channel is larger without excessively increasing the processing difficulty of the laminations 110, so that the air flow through the spiral air channel is larger, and the heat dissipation effect is better.

[0052] Specifically, taking Figure 3 for example, in the embodiment, the number P of pole pairs of the permanent magnet 200 is 5, the number S of the air channel holes 113 of the laminations 110 is 14, the number m of the pole pairs of the upper layer of laminations 110 which are rotated across the lower layer of laminations 110 is 1, and then the air channel holes 113 of the upper layer of laminations 110 are offset from the air channel holes 113 of the lower layer of laminations 110 which are in communication with the air channel holes 113 of the upper layer of laminations 110 by an angle Δθ=360°×(m×S / P-k) / S=Δθ=360°×(1×14 / 5-3) / 14≈-5.14°, the offset angle is smaller, the air flow through the spiral air channel is larger, and the wind speed is larger, so that a better heat dissipation effect can be achieved.

[0053] In other embodiments, m can also take other values such as 2 or 3, etc., which are not limited herein.

[0054] In the case where the number P of pole pairs and the value of m are certain, the more the number S of the air channel holes 113 of the laminations 110, the smaller the offset angle Δθ of the air channel holes 113 of the upper layer of laminations 110 from the air channel holes 113 of the lower layer of laminations 110 which are in communication with the air channel holes 113 of the upper layer of laminations 110, so that the area of the cross section of the spiral air channel of the rotor core 100 along the radial direction of the rotation shaft mounting hole 111 is larger, the air flow through the spiral air channel is larger, and the heat dissipation effect is better.

[0055] In another specific embodiment, the number of pole pairs P of the permanent magnet 200 can also be 4, the number of air channel holes 113 of the laminated sheet 110 can be 15, and the number of pole pairs m that the upper laminated sheet 110 rotates relative to the lower laminated sheet 110 can be 1. In this case, the angle of offset Δθ of the air channel hole 113 of the upper laminated sheet 110 relative to the air channel hole 113 of the lower laminated sheet 110 that is in communication with the upper laminated sheet 110 is Δθ = 360° × (m × S / P - k) / S = Δθ = 360° × (1 × 15 / 4 - 4) / 15 = -6°. The angle of offset is small, so the air flow through the spiral air channel is large and the air speed is high, which can achieve a better heat dissipation effect.

[0056] In other embodiments, the number of pole pairs P of the permanent magnet 200 can also be 2 or 3 or other desired number, which is not limited herein.

[0057] In the present embodiment, the side wall of the air channel hole 113 can also be inclined relative to the axial direction of the rotating shaft mounting hole 111. The inclination angle can be set according to the angle of offset of the air channel hole 113 of the upper laminated sheet 110 relative to the air channel hole 113 of the lower laminated sheet 110 that is in communication with the upper laminated sheet 110, so that the transition of the air channel holes 113 of the adjacent laminated sheets 110 is smoother, the air flow in the spiral air channel is smoother, the air flow speed is faster, and the heat dissipation effect is further improved.

[0058] Referring to Figure 4 and Figure 5 , an embodiment of the motor of the present application includes a housing 20, a rotating shaft 30, a rotor 10, and a stator 40. The rotating shaft 30 is arranged through the housing 20. The rotor 10 is sleeved on the rotating shaft 30 and located in the housing 20. The stator 40 is sleeved outside the rotor 10 and located in the housing 20. The stator 40 is arranged in spaced relation to the rotor 10. The stator 40 abuts against the housing 20. An inner side wall of the housing 20 is formed with a plurality of air channel grooves 210 that are uniformly distributed along the circumferential direction of the housing. The structure of the rotor 10 is described above and will not be repeated here.

[0059] Specifically, when the rotor 10 rotates relative to the stator 40, the air in the housing 20 can enter the spiral air channel from the bottom of the rotor 10, form a spiral air flow, and flow out from the top of the rotor 10 to the top of the housing 20, and then flow to the bottom of the housing 20 from the top of the housing 20 through the gap between the rotor 10 and the stator 40 and the air channel grooves 210, thereby achieving heat dissipation of the motor.

[0060] In other embodiments, the spiral air channel can also be arranged such that the air enters from the top of the rotor 10 and flows out from the bottom, which is not limited herein. Specifically, the flow direction of the air can be changed by changing the spiral direction of the spiral air channel, or the flow direction of the air can be changed by changing the rotating direction of the rotor 10.

[0061] By arranging the spiral air duct in the rotor 10, the air in the spiral air duct can form a pressure difference in the axial direction of the rotor 10 during rotation of the rotor 10, thereby forming an air flow, which can carry out the heat in the motor, realize rapid heat dissipation of the motor, protect the permanent magnet 200 from demagnetization risk, and also reduce the weight of the rotor 10, thereby reducing the moment of inertia of the rotor 10, which is beneficial to rapid start and rapid braking of the motor.

[0062] Referring to Figure 6 Another embodiment of the motor of the present application includes a housing 20, a rotating shaft 30, a rotor 10 and a stator 40, wherein the structures of the rotating shaft 30, the rotor 10 and the stator 40 are described above and will not be repeated here.

[0063] The difference between the present embodiment and the above-mentioned embodiments is that in the present embodiment, the housing 20 is formed with an air inlet 201 and an air outlet 202, the air inlet 201 is located at the bottom end of the housing 20 and is formed on the side wall of the housing 20, and the air outlet 202 is located at the side of the air inlet 201 close to the top end of the housing 20 and is formed on the side wall of the housing 20, so that the air flow can enter the housing 20 from the air inlet 201, then flow to the space between the rotor 10 and the stator 40 through the spiral air duct, the air duct groove 210, and then flow out from the air outlet 202, so that the air flow entering the spiral air duct is the air with lower temperature introduced from the outside through the air inlet 201, the air flows through the rotor 10, the stator 40 and the housing 20, increases the area of contact with the inner surface of the motor, so that the heat generated by the motor can be more effectively conducted to the air flow, and then dissipated to the outside through the air outlet 202, achieving better heat dissipation effect.

[0064] In other embodiments, the air inlet 201 and the air outlet 202 can also be formed on the top wall and / or the bottom wall of the housing 20, which is not limited here.

[0065] In other embodiments, the air inlet 201 and the air outlet 202 can also be arranged at opposite ends of the housing 20, so that the air can enter from one end of the housing 20 and flow out from the other end of the housing 20, so that the air in the motor can be exchanged with the air outside more quickly, and the heat dissipation effect is better.

[0066] The above-mentioned is only an embodiment of the present application, and does not limit the patent scope of the present application, any equivalent structure or equivalent flow conversion made by using the content of the specification and drawings of the present application, or direct or indirect application in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A rotor of a motor, characterized in that: The rotor comprises: A rotor core, the rotor core comprising a plurality of laminations of the same shape, stacked and coaxially arranged, the laminations being formed with a shaft mounting hole, a plurality of shaft key slots and a plurality of air duct holes, the plurality of shaft key slots being in communication with the shaft mounting hole and being spaced apart circumferentially along the shaft mounting hole, the plurality of air duct holes being spaced apart circumferentially along the shaft mounting hole, the laminations of an upper layer of the plurality of laminations being offset relative to the laminations of a lower layer so that the air duct holes of the plurality of laminations together form a spiral air duct, and the shaft key slots of the laminations of an upper layer and the laminations of a lower layer being aligned axially along the shaft mounting hole; A plurality of permanent magnets are arranged on the rotor core; Wherein, a plurality of magnetic pole mounting slots are further formed on the laminations, and the plurality of magnetic pole mounting slots are respectively used to mount a plurality of the permanent magnets, and the number of the shaft key slot holes is equal to the number of magnetic pole pairs of the plurality of permanent magnets; wherein the angle of offset of the upper layer of the plurality of laminations relative to the lower layer of the laminations is an angle corresponding to m times the number of magnetic pole pairs, where m is a natural number, so that the shaft key slot holes and the magnetic pole mounting slots of the upper layer of the laminations and the lower layer of the laminations among the plurality of laminations are aligned along the axial direction of the shaft mounting hole; Among them, the angle Δθ of the air duct holes of the upper layer of the multiple laminates relative to the air duct holes of the next layer of the laminates connected thereto is offset by 360°×(m×S / Pk) / S, wherein S is the number of the air duct holes of the laminates, P is the number of magnetic pole pairs of the permanent magnet, and k is the rounded integer value of the calculated m×S / P.

2. The rotor according to claim 1, characterized in that The number P of magnetic pole pairs of the permanent magnet and the number S of the air duct holes of the lamination satisfy: n×P=m×S±1, where n is a natural number.

3. The rotor according to claim 2, characterized in that The angle Δθ of the air duct holes of the upper layer of the laminates among the plurality of laminates offset from the air duct holes of the lower layer of the laminates connected thereto is =±360° / (P×S).

4. The rotor according to claim 1, characterized in that The difference between the number of the air duct holes and the number of the magnetic poles of the permanent magnet is 2, 4 or 7.

5. The rotor according to claim 1, characterized in that The number of the air duct holes of the laminations is not equal to an integer multiple of the number of magnetic pole pairs of the permanent magnet, so that the air duct holes of a plurality of laminations can together form the spiral air duct.

6. A motor, characterized in that: include: case; A rotating shaft is arranged through the housing; a rotor, sleeved on the rotating shaft and located in the housing, wherein the rotor is the rotor according to any one of claims 1 to 5; The stator is sleeved outside the rotor and located in the shell. The stator and the rotor are spaced apart and abut against the shell. A plurality of air duct grooves uniformly distributed along the circumference of the shell are formed on the inner side wall of the shell.

7. The motor according to claim 6, characterized in that The shell is formed with an air inlet and an air outlet, the air inlet is located at the bottom end of the shell, and the air outlet is located on the side of the air inlet close to the top end of the shell, so that the air flow can enter the shell from the air inlet, and then flow through the spiral air duct to between the rotor and the stator, the air duct groove, and out from the air outlet.

Images