Tangential rotor structure and fan motor

Abstract

The application relates to the technical field of motors, in particular to a tangential rotor structure and a fan motor. The tangential rotor structure is matched with a stator winding and comprises a rotor core, a plurality of mounting grooves extending in a radial direction are arranged on the rotor core, and the plurality of mounting grooves are uniformly arranged in a circumferential direction; a plurality of magnet groups, the number of the magnet groups is the same as that of the mounting grooves, and the magnet groups are one-to-one corresponding; the magnet groups are arranged in the mounting grooves; and each magnet group comprises two ferrite magnets with opposite magnetism. In this way, the mounting mode of the rotor structure and the replacement material are adjusted, the cost of the rotor structure is greatly reduced while the performance of the electrode is ensured, and better economic benefits are obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a tangential rotor structure and a fan motor. BACKGROUND

[0002] With the development of economy, energy saving has become inevitable and social consensus. Various electrical appliances are increasingly towards the direction of energy saving, convenient to use, space saving, safe and efficient, one machine multi-featured. The assembly fan is no exception as an important member of people's life electrical appliances.

[0003] The rotor structure of the commonly used assembly fan adopts surface mounting type and built-in type, generally adopts neodymium iron boron material. Due to the high price of neodymium iron boron material in metal material, the price of rotor structure is high, which affects the cost of the whole assembly fan, and the application of rotor structure is limited. SUMMARY

[0004] The purpose of the present application includes, for example, to provide a tangential rotor structure and a fan motor, which can greatly reduce the cost of the rotor structure while ensuring the performance of the electrode by adjusting the installation method of the rotor structure and using alternative materials, so as to obtain better economic benefits.

[0005] The embodiments of the present application can be implemented as follows:

[0006] In a first aspect, the present application provides a tangential rotor structure cooperating with a stator winding, comprising:

[0007] A rotor core, a plurality of installation slots extending in the radial direction are arranged on the rotor core, and the plurality of installation slots are uniformly arranged in the circumferential direction;

[0008] A plurality of magnet groups, the number of the magnet groups is the same as the number of the installation slots, and one-to-one correspondence; the magnet groups are arranged in the installation slots;

[0009] The magnet group comprises two magnetically opposite ferrite magnets.

[0010] The magnet group of the tangential rotor structure is matched with the radially extending installation slot, that is, the magnet group of the rotor is arranged in the radial direction, and the corresponding magnetic induction line direction is tangential, thus forming the tangential rotor. In addition, the magnet group adopts two ferrite magnets. The price of the ferrite material with the same volume is about one tenth of that of the neodymium iron boron material. Compared with the surface-mounted rotor of the existing radial rotor magnetic circuit mode, each magnetic steel serves as a pole, while the tangential rotor structure of the present application uses two adjacent magnets as a pole, so that the two magnetic poles of the ferrite material serve as a magnetic potential source to achieve the same magnetic performance of the neodymium iron boron magnetic steel, and the material cost is significantly reduced. Further, the installation slot is radially extended, compared with the circumferentially arranged magnetic slot of the radial rotor, the installation slot of the tangential rotor structure can accommodate larger magnets, thereby ensuring that the rotor structure has better magnetism. In summary, such a tangential rotor structure has the advantages of simple structure, convenient operation, and lower cost under the same magnetic performance.

[0011] In an optional embodiment, along the circumferential direction of the rotor core, the magnetic properties of the magnets on the side close to each other in the adjacent magnet groups are the same.

[0012] In an optional embodiment, a plurality of first rotor slots axially penetrating the rotor core are arranged on the rotor core, and the number of the first rotor slots is the same as that of the installation slots.

[0013] The first rotor slots are located between the adjacent installation slots on the rotor core.

[0014] In an optional embodiment, the plurality of first rotor slots are uniformly arranged along the circumferential direction of the rotor core.

[0015] In an optional embodiment, the radial distances of the plurality of first rotor slots from the center of the rotor core are the same.

[0016] In an optional embodiment, along the axial direction of the rotor core, the installation slots penetrate the rotor core, and the installation slots form open mouths on the circumferential side wall of the rotor core.

[0017] In an optional embodiment, along the circumferential direction of the rotor core, the two side walls of the installation slot are each provided with an extension;

[0018] In the same installation slot, the two extensions extend towards each other.

[0019] In an optional embodiment, a transition groove is further arranged at the connection between the extension and the side wall of the installation slot, and the transition groove penetrates the rotor core along the axial direction of the rotor core.

[0020] The transition groove extends in a direction away from the magnet group in the same mounting groove.

[0021] In an optional embodiment, the mounting groove comprises a fitting section and an extension section connected in sequence in a direction from the radial outer wall of the rotor core to the center of the rotor core, and the width of the extension section at the end away from the center of the rotor core is greater than the width of the extension section at the end close to the center of the rotor core.

[0022] The magnet group is arranged in the fitting section.

[0023] In a second aspect, the application provides a fan motor comprising a stator winding and the tangential rotor structure of any one of the preceding embodiments.

[0024] The tangential rotor structure is arranged at the center of the stator winding.

[0025] Such a fan motor comprises the tangential rotor structure described above, and thus has all the beneficial effects of the fan motor. Further, the fan motor has the advantages of light weight, good magnetic effect, and low cost, and has outstanding cost performance.

[0026] The beneficial effects of the embodiments of the application include, for example:

[0027] The tangential rotor structure of the present solution comprises a rotor core and a plurality of magnet groups. The magnet group is arranged in a radially extending mounting groove, and the magnet group comprises two magnetically opposite ferrite magnets. Compared with the existing radial rotor magnetic circuit mode, the surface-mounted rotor, each magnetic steel acts as a pole, while the tangential rotor structure of the present solution has two adjacent magnets as a pole, so that the two magnetic poles of the ferrite material act as a magnetic potential source to achieve the same magnetic performance as the neodymium iron boron magnetic steel. The price of the same volume of ferrite material is about one tenth of that of neodymium iron boron material, so the cost of the rotor can be significantly reduced. Compared with the radial rotor, the mounting groove of the present solution extends radially, so that the mounting groove can better accommodate the magnet group with two magnets as a pole. In summary, the two magnetic poles of the ferrite material act as a magnetic potential source to achieve the same magnetic performance as a neodymium iron boron material magnetic pole, so the cost of the rotor can be significantly reduced, and outstanding economic benefits can be obtained. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor.

[0029] Figure 1 It is a structural schematic diagram of the tangential rotor structure of the embodiments of the application.

[0030] Figure 2 Another perspective view of the tangential rotor structure of the embodiment of the present application;

[0031] Figure 3 Still another perspective view of the tangential rotor structure of the embodiment of the present application;

[0032] Figure 4 A partial view of the tangential rotor structure of the embodiment of the present application.

[0033] Legend: 10 - tangential rotor structure; 100 - rotor core; 101 - shaft hole; 110 - mounting groove; 111 - open mouth; 121 - fitting section; 122 - extension section; 200 - magnet group; 210 - ferrite magnet; 310 - first rotor slot; 320 - second rotor slot; 410 - extension; 420 - transition groove; 20 - stator winding. DETAILED DESCRIPTION

[0034] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but only represents selected embodiments of the application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present application.

[0036] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings.

[0037] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the product of the present application is used, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, it cannot be understood as a limitation on the present application.

[0038] In addition, if the terms "first", "second" and the like are used herein, they are merely used to distinguish one entity from another, and do not imply or suggest a relative importance.

[0039] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0040] With the development of economy and the progress of society, energy saving has become inevitable and social consensus. Various appliances are increasingly developing towards the direction of energy saving, convenient use, space saving, safety and efficiency, and one machine with multiple functions. The fan assembly is no exception as an important member of people's life appliances. The motor is an important component of the fan assembly.

[0041] Compared with ordinary motors, permanent magnet motors can maintain their magnetic field without external energy, while ordinary motors need current to pass in to have a magnetic field. The rotor of the permanent magnet motor is installed with permanent magnet poles, while the rotor of the ordinary motor is installed with excitation coils.

[0042] The forms of permanent magnet motor are: (1) rectangular pulse wave current, permanent magnet brushless DC motor PMBDC has rectangular pulse wave current. (2) sinusoidal wave current, permanent magnet reluctance synchronous motor PSM has sinusoidal wave current. (3) hybrid permanent magnet motor. It generally selects permanent magnet materials, such as rare earth samarium-cobalt: maximum energy density. (2) neodymium iron boron: widely available, good processability.

[0043] The rotor structure of the commonly used permanent magnet motor adopts surface mounting type and built-in type, and generally uses neodymium iron boron material.

[0044] The advantages of neodymium iron boron are:

[0045] 1) high price.

[0046] 2) highest residual magnetism, coercive force and maximum magnetic energy product.

[0047] 3) moderate manufacturing process.

[0048] The disadvantages of neodymium iron boron are:

[0049] 1) low Curie temperature, high temperature coefficient (poor magnetic performance stability).

[0050] 2) easy demagnetization at high temperature and easy corrosion.

[0051] Therefore, the rotor structure using neodymium iron boron material as the rotor magnetic circuit has the characteristics of high cost and small size. Recently, due to the rise of metal materials, the corresponding neodymium iron boron material has also risen sharply.

[0052] In order to improve the above technical problems, a tangential rotor structure and fan motor are provided in the following embodiments.

[0053] Reference should be made to Figure 1 The embodiment provides a tangential rotor structure 10 which cooperates with a stator winding 20 and comprises the following:

[0054] A rotor core 100, wherein a plurality of mounting grooves 110 extending in a radial direction are arranged on the rotor core 100, and the plurality of mounting grooves 110 are uniformly arranged in a circumferential direction.

[0055] A plurality of magnet groups 200, wherein the number of the magnet groups 200 is the same as that of the mounting grooves 110, and the magnet groups 200 are in one-to-one correspondence; the magnet groups 200 are arranged in the mounting grooves 110.

[0056] The magnet group 200 comprises two ferrite magnets 210 with opposite magnetism.

[0057] The magnet group 200 of the tangential rotor structure 10 cooperates with the mounting groove 110 arranged in a radial direction, that is, the magnet group 200 of the rotor is arranged in a radial direction, and the corresponding magnetic induction line direction is tangential, so that the tangential rotor is formed. In addition, the magnet group 200 of the embodiment adopts two ferrite magnets 210. The price of the same volume of ferrite material is about one tenth of that of neodymium iron boron material. Compared with the surface-mounted rotor of the existing radial rotor magnetic circuit mode, each magnetic steel serves as a pole, while the tangential rotor structure 10 of the embodiment uses two adjacent magnets as a pole, so that the two magnetic poles of the ferrite material serve as a magnetic potential source to achieve the same magnetic performance of the neodymium iron boron magnetic steel, and the material cost is significantly reduced.

[0058] Meanwhile, the ferrite has the advantages of low price, simple manufacturing process, large coercive force, strong demagnetization resistance, small density and light weight.

[0059] Further, the mounting groove 110 of the embodiment extends in a radial direction, compared with the circumferential arrangement of the magnetic groove of the radial rotor, the mounting groove 110 of the tangential rotor structure 10 can accommodate a larger volume of magnet, so as to ensure that the rotor structure has better magnetism. In summary, the tangential rotor structure 10 has the advantages of simple structure, convenient operation, and lower cost under the same magnetic performance.

[0060] Please continue to refer to Figures 1 to 4 to understand more structural details of the tangential rotor structure 10 of the embodiment.

[0061] It can be seen from Figure 1 that the tangential rotor structure 10 can be arranged at the center of the stator winding 20. The stator winding 20 comprises a stator core and a winding arranged on the stator core.

[0062] The rotor core 100 is provided with a shaft hole 101 matched with the motor shaft, which penetrates the rotor core 100 along the axial direction. In the embodiment, the stator winding 20 and the rotor core 100 are both circular column structures.

[0063] Further, the distance from each mounting slot 110 to the center of the rotor core 100 is the same. The tangential rotor structure 10 in the embodiment has 8 rotor cores 100, 8 magnet groups 200 and 16 ferrite magnets 210.

[0064] From Figures 1 to 3 It can also be seen that, in the embodiment of the application, the magnetic properties of the magnets on the sides close to each other in adjacent magnet groups 200 along the circumferential direction of the rotor core 100 are the same. Such an arrangement can make the magnetic energy generated by adjacent magnet groups 200 avoid interference with each other, thereby ensuring that the tangential rotor structure 10 has better magnetic properties as a whole.

[0065] It can also be seen from the figure that, in the embodiment of the application, the rotor core 100 is provided with a plurality of first rotor slots 310 penetrating in the axial direction, and the number of the first rotor slots 310 is the same as that of the mounting slots 110; the first rotor slots 310 are located between adjacent mounting slots 110 on the rotor core 100.

[0066] The plurality of first rotor slots 310 can significantly reduce the weight of the rotor core 100, thereby making the tangential rotor structure 10 as a whole have more flexible motion characteristics, and also reducing the cost of the rotor core 100. In addition, the rotor core 100 can also serve as a mounting site of the conductive strips.

[0067] Specifically, the first rotor slots 310 in the embodiment are cylindrical through slots.

[0068] Further, in the embodiment of the application, the plurality of first rotor slots 310 are uniformly arranged along the circumferential direction of the rotor core 100. Alternatively, the radial distances from the plurality of first rotor slots 310 to the center of the rotor core 100 are the same.

[0069] As for the specific structure of the first rotor slots 310, those skilled in the art should be able to make reasonable choices and designs according to actual needs, which are not specifically limited here. For example, the first rotor slots 310 can adopt square, circular or trapezoidal shapes, etc. to adapt to different actual situations, which are merely examples and are not specifically limited.

[0070] As shown in the figure, the rotor core 100 is provided with a plurality of second rotor slots 320 which axially penetrate the rotor core 100. In the embodiment, the number of the second rotor slots 320 is half of the number of the mounting slots 110. The second rotor slots 320 are arranged between two adjacent mounting slots 110; along the circumferential direction of the rotor core 100, two mounting slots 110 are arranged between two adjacent second rotor slots 320.

[0071] Specifically, the second rotor slot 320 comprises two slot holes which are symmetrically arranged along the circumferential direction of the rotor core 100. The sidewall of one of the slot holes is in communication with the inner wall of the mounting slot 110, and the sidewall of the other slot hole is in communication with the inner wall of another mounting slot 110 which is adjacent to the mounting slot 110. The second rotor slot 320 can significantly reduce the weight of the rotor core 100, so that the tangential rotor structure 10 as a whole obtains more flexible motion characteristics, and can also reduce the cost of the rotor core 100. The first rotor slot 310 of the embodiment is a semicircular through slot.

[0072] Please refer to Figures 1 to 4 As shown in the figure, in the embodiment of the present application, the mounting slot 110 penetrates the rotor core 100 along the axial direction of the rotor core 100, and the mounting slot 110 forms an open port 111 on the outer wall of the rotor core 100. The arrangement of such an open port 111 can facilitate the installation of the magnet group 200, and on the other hand, can also reduce the volume and weight of the tangential rotor structure 10, so as to obtain better flexibility and reliability.

[0073] Please refer to Figure 4 As shown in the figure, in the embodiment of the present application, the two sidewalls of the mounting slot 110 are respectively provided with an extension 410 along the circumferential direction of the rotor core 100; in the same mounting slot 110, the two extensions 410 extend towards each other.

[0074] The extension 410 can limit the position of the magnet group 200 in the radial direction of the rotor core 100, so as to ensure that the magnet group 200 can be stably arranged in the rotor core 100.

[0075] From Figure 4 It can also be seen that, in the embodiment of the present application, the connection between the extension 410 and the sidewall of the mounting slot 110 is further provided with a transition groove 420; the transition groove 420 penetrates the rotor core 100 along the axial direction of the rotor core 100; in the same mounting slot 110, the transition groove 420 extends away from the magnet group 200.

[0076] The transition groove here can avoid the problem of uneven stress caused by stress concentration at the edge of the extension 410 and the mounting slot 110, so as to ensure the stability of the extension 410.

[0077] From Figure 1 And Figure 3 As can be seen from the drawings, along the direction from the radial outer wall of the rotor core 100 to the center of the rotor core 100, the mounting groove 110 comprises a fitting section 121 and an extension section 122 connected in sequence, and the width of the extension section 122 away from the center of the rotor core 100 is greater than the width of the extension section 122 close to the center of the rotor core 100; the magnet group 200 is arranged in the fitting section 121. Specifically, the cross-sectional shape of the fitting section 121 is rectangular, and the cross-sectional shape of the extension section 122 is trapezoidal.

[0078] Compared with the structure of the solid rotor core 100, such an arrangement can reduce the weight of the middle part of the rotor core 100, so that the weight of the tangential rotor structure 10 is further reduced, thereby obtaining better running flexibility and reliability.

[0079] In use, because the radial rotor is a magnetic pole generated by a magnetic field of a magnet, the tangential rotor structure 10 is a magnetic pole generated by a magnetic field of two adjacent magnets. In the same volume, ferrite is slightly inferior to neodymium iron boron in magnetic performance. By adopting the tangential magnetic circuit structure, each pole has two magnets to generate a magnetic field, so that the tangential structure can realize the replacement of neodymium iron boron with ferrite, and realize the performance of the motor.

[0080] In a second aspect, the application provides a fan motor comprising a stator winding 20 and the tangential rotor structure 10 of any one of the preceding embodiments.

[0081] The tangential rotor structure 10 is arranged at the center of the stator winding 20.

[0082] Such a fan motor comprises the tangential rotor structure 10 described above, and therefore has all the beneficial effects of the fan motor. Further, the fan motor has the advantages of light weight, good magnetic effect, low cost, and outstanding cost performance.

[0083] In summary, the embodiments of the application provide a tangential rotor structure 10 and a fan motor, which have at least the following advantages:

[0084] The tangential rotor structure 10 of the present application comprises a rotor core 100 and a plurality of magnet sets 200. The magnet sets 200 are arranged in radially extending mounting slots 110, and each magnet set 200 comprises two magnetically opposite ferrite magnets 210. In contrast to the prior art radial rotor, the surface-mounted rotor, each magnet serves as a pole, while the tangential rotor structure 10 of the present application uses two adjacent magnets as a pole, so that the two magnetic poles of the ferrite material serve as a magnetic potential source to achieve the same magnetic performance as the neodymium iron boron magnet. The price of the ferrite material of the same volume is about one tenth of the neodymium iron boron material, so that the cost of the rotor can be significantly reduced. Compared with the radial rotor, the mounting slots 110 of the present application extend radially, so that the two magnet sets 200 as a pole can be better accommodated. In summary, the two magnetic poles of the ferrite material serve as a magnetic potential source to achieve the same magnetic performance as a neodymium iron boron material magnetic pole, so that the cost of the rotor can be significantly reduced, and outstanding economic benefits can be obtained.

[0085] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any changes or replacements within the technical scope disclosed by the present application can be easily thought of by those skilled in the art, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A tangential rotor structure, cooperating with a stator winding, characterized in that, The application relates to a tangential rotor structure, which comprises the following components: a rotor core (100) provided with a plurality of mounting grooves (110) extending in a radial direction, and the mounting grooves (110) are uniformly arranged in a circumferential direction; a plurality of magnet groups (200) which are the same in number as the mounting grooves (110) and one-to-one corresponding; the magnet groups (200) are arranged in the mounting grooves (110); the magnet group (200) comprises two magnetically opposite ferrite magnets (210); the rotor core (100) is provided with a plurality of second rotor grooves (320) axially penetrating; the number of the second rotor grooves (320) is half of the number of the mounting grooves (110); the second rotor groove (320) is arranged between two adjacent mounting grooves (110); along the circumferential direction of the rotor core (100), two mounting grooves (110) are arranged between two adjacent second rotor grooves (320); the second rotor groove (320) comprises two slot holes symmetrically arranged along the circumferential direction of the rotor core (100); one side wall of one slot hole is communicated with the inner wall of the mounting groove (110), and the other slot hole is communicated with the inner wall of another mounting groove (110) adjacent to the mounting groove (110); the second rotor groove (320) can significantly reduce the weight of the rotor core (100), so that the tangential rotor structure as a whole has more flexible motion characteristics, and the cost of the rotor core (100) is reduced.

2. The tangential rotor structure according to claim 1, wherein: along the circumferential direction of the rotor core (100), the magnetism of the magnets on the side close to each other in the adjacent magnet groups (200) is the same.

3. The tangential rotor structure according to claim 1, wherein: the rotor core (100) is provided with a plurality of first rotor grooves (310) axially penetrating, and the number of the first rotor grooves (310) is the same as that of the mounting grooves (110); the first rotor groove (310) is located between the adjacent mounting grooves (110) on the rotor core (100).

4. The tangential rotor structure according to claim 3, wherein: a plurality of first rotor grooves (310) are uniformly arranged along the circumferential direction of the rotor core (100).

5. The tangential rotor structure according to claim 4, wherein: the radial distance of a plurality of the first rotor grooves (310) from the center of the rotor core (100) is the same.

6. The tangential rotor structure according to any one of claims 1-5, wherein: along the axial direction of the rotor core (100), the mounting groove (110) penetrates the rotor core (100), and the mounting groove (110) forms an open port (111) on the outer wall of the rotor core (100) in the circumferential direction.

7. The tangential rotor structure according to claim 6, wherein: along the circumferential direction of the rotor core (100), the two side walls of the mounting groove (110) are respectively provided with an extension (410). The two extension portions (410) extend towards each other in the same mounting slot (110).

8. The tangential rotor structure according to claim 7, characterized in that: The connection between the extension portion (410) and the side wall of the mounting slot (110) is further provided with a transition groove (420); the transition groove (420) penetrates the rotor core (100) along the axial direction of the rotor core (100); The transition groove (420) extends away from the magnet group (200) in the same mounting slot (110).

9. The tangential rotor structure according to claim 6, characterized in that: The mounting slot (110) comprises a fitting section (121) and an extension section (122) connected in sequence along the direction from the radial outer wall of the rotor core (100) to the center of the rotor core (100), and the width of the extension section (122) away from the center of the rotor core (100) is greater than the width of the extension section (122) close to the center of the rotor core (100); The magnet group (200) is arranged in the fitting section (121).

10. A fan motor, characterized in that: It comprises a stator winding (20) and the tangential rotor structure according to any one of claims 1-9; The tangential rotor structure is arranged at the center of the stator winding (20).

Images