Consequent pole rotor and motor

Abstract

The invention discloses a consequent pole rotor and a motor, the consequent pole rotor comprises a rotor core and a plurality of permanent magnet groups, the plurality of permanent magnet groups are arranged in the rotor core at intervals along the circumferential direction of the rotor core, the plurality of permanent magnet groups comprise a first permanent magnet group and a second permanent magnet group, and the magnetizing directions of the first permanent magnet group and the second permanent magnet group are not consistent; wherein the second permanent magnet groups are arranged on the two sides, in the circumferential direction of the rotor iron core, of the first permanent magnet groups, and silicon steel poles are formed between the first permanent magnet groups and the adjacent second permanent magnet groups. According to the invention, the first permanent magnet group and the second permanent magnet group are embedded into the rotor core, and compared with a traditional surface-mounted structure, most of the second magnetic shoe structures are far away from the surface of the rotor and far away from a stator demagnetization magnetic field, so that the anti-demagnetization capability is improved. Moreover, the arrangement mode in the embodiment can improve the utilization rate of the permanent magnets, thereby improving the torque performance, and improving the motor performance.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to an alternating-pole rotor and a motor. Background Art

[0002] The rotor of the motor usually adopts an alternating pole structure to reduce the amount of second magnetic tiles. The commonly used alternating pole structure usually adopts a surface-mounted alternating pole structure in which the second magnetic tiles are attached to the surface of the rotor core at intervals. The above-mentioned surface-mounted alternating structure has weak anti-demagnetization ability, which limits its application in fields with high anti-demagnetization requirements and low cost. Summary of the invention

[0003] The main purpose of the present invention is to provide an alternating pole rotor and a motor, aiming to solve the problem of weak anti-demagnetization ability of the surface-mounted alternating structure.

[0004] To achieve the above-mentioned purpose, the present invention proposes an alternating-pole rotor, which comprises a rotor core and a plurality of permanent magnet groups, wherein the plurality of permanent magnet groups are arranged in the rotor core at intervals along the circumferential direction of the rotor core, wherein the plurality of permanent magnet groups comprise a first permanent magnet group and a second permanent magnet group, wherein the first permanent magnet group forms a V-shaped structure with an opening toward the outer circle of the rotor core, and the second permanent magnet group is a strip structure extending along the radial direction of the rotor core, and the magnetization directions of the first permanent magnet group and the second permanent magnet group are inconsistent; wherein the second permanent magnet group is arranged on both sides of the first permanent magnet group along the circumferential direction of the rotor core, and a silicon steel pole is formed between the first permanent magnet group and the adjacent second permanent magnet group.

[0005] Optionally, one of the first permanent magnet groups and two spaced second permanent magnet groups arranged on one side of the first permanent magnet group form a first unit; two of the first permanent magnet groups and two of the second permanent magnet groups are staggered to form a second unit; the alternating pole rotor includes M first units and N second units; wherein M and N are both natural numbers, and M+N≥1.

[0006] Optionally, the portion of the rotor core corresponding to the first permanent magnet group forms a first permanent magnet pole, a second permanent magnet pole is formed between two adjacent second permanent magnet groups, and the total number of magnetic poles of the silicon steel pole, the first permanent magnet pole and the second permanent magnet pole is 2p;

[0007] The central angle corresponding to the first permanent magnet pole is α, and the value range of α is [0.7*π / p, 1.2*π / p];

[0008] The central angle corresponding to the silicon steel pole is β, and the value range of β is [0.7*π / p, 1.2*π / p];

[0009] The central angle corresponding to the second permanent magnet pole is γ, and the value range of γ is [0.7*π / p, 1.2*π / p].

[0010] Optionally, on a cross section perpendicular to the rotor core, the first permanent magnet group includes two first magnetic tiles arranged at an angle, and a magnetizing direction of the first magnetic tile is perpendicular to a direction of the first magnetic tile; and / or,

[0011] The second permanent magnet group includes a second magnetic tile extending in the radial direction of the rotor core, and the magnetization direction of the second magnetic tile is tangential to the rotor core;

[0012] Furthermore, the adjacent surface magnetic poles of the first magnetic tile / the second magnetic tile and the adjacent first magnetic tile / the second magnetic tile are the same.

[0013] Optionally, an outer circumference of the rotor core forms a chamfered surface corresponding to two sides of the first permanent magnet group / the second permanent magnet group.

[0014] Optionally, the rotor core is provided with first air slots penetrating in the radial direction thereof, and the first air slots are provided at two ends of the first permanent magnet group.

[0015] Optionally, on a cross section perpendicular to the rotor core, a portion of the rotor core corresponding to the outer side of the first permanent magnet group is provided with a magnetic barrier.

[0016] Optionally, the rotor core is provided with a second air slot which penetrates in the radial direction thereof, and the second air slot is provided at an end of the second permanent magnet group close to the axis center of the rotor core.

[0017] Optionally, there are two second permanent magnet groups arranged adjacent to each other on the rotor core, and an internal magnetic bridge is formed between the second air slots corresponding to the two adjacent second permanent magnet groups, and the internal magnetic bridge is tapered in a direction close to the axis of the rotor core.

[0018] In addition, the present invention further provides a motor, comprising a stator and the alternating-pole rotor as described above, wherein the alternating-pole rotor is rotatably disposed in the stator.

[0019] In the technical solution of the present invention, compared with the traditional surface-mounted structure, an embedded structure is adopted, that is, the first permanent magnet group and the second permanent magnet group are embedded in the rotor core, and most of the second magnetic tile structure is far away from the rotor surface and farther than the stator demagnetization magnetic field, thereby improving the demagnetization rate. In addition, the arrangement in this embodiment can improve the utilization rate of permanent magnets, thereby improving torque performance and improving motor performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 It is a schematic structural diagram of an alternating-pole rotor in a first embodiment of the present invention;

[0022] Figure 2 is a magnetic flux distribution diagram in the first embodiment of the present invention;

[0023] Figure 3 It is a schematic structural diagram of an alternating-pole rotor in a second embodiment of the present invention;

[0024] Figure 4 is a magnetic flux distribution diagram in the second embodiment of the present invention;

[0025] Figure 5 This is a comparison diagram of the utilization rate and demagnetization rate of the permanent magnet of the present invention;

[0026] Figure 6 It is a schematic structural diagram of an alternating-pole rotor in a third embodiment of the present invention;

[0027] Figure 7 It is a schematic structural diagram of an alternating-pole rotor in a fourth embodiment of the present invention;

[0028] Figure 8 Schematic diagram of the structure of the alternating pole rotor in the fifth embodiment of the present invention.

[0029] Description of Figure Numbers:

[0030] Label name Label name 100 Alternating pole rotor 16 Internal magnetic bridge 1 Rotor core 21 The first permanent magnet group 11 Curved surface 22 The second permanent magnet group 12 External magnetic bridge 31 The first permanent magnet 13 First air tank 32 Silicon steel pole 14 Magnetic Barrier 33 Second permanent magnet 15 Second air tank

[0031] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0034] In addition, in the present invention, descriptions such as "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0035] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] The present invention provides an alternating pole rotor and a motor, aiming to solve the problem of weak anti-demagnetization capability of a surface-mounted alternating structure.

[0038] like Figure 1 As shown, in one embodiment, the alternating-pole rotor 100 includes a rotor core 1 and a plurality of permanent magnet groups, wherein the plurality of permanent magnet groups are arranged in the rotor core 1 at intervals along the circumferential direction of the rotor core 1, and the plurality of permanent magnet groups include a first permanent magnet group 21 and a second permanent magnet group 22, and the magnetizing directions of the first permanent magnet group 21 and the second permanent magnet group 22 are inconsistent; wherein the second permanent magnet group 22 is arranged on both sides of the first permanent magnet group 21 along the circumferential direction of the rotor core 1, and a silicon steel pole 32 is formed between the first permanent magnet group 21 and the adjacent second permanent magnet group 22.

[0039] In this embodiment, compared with the traditional surface-mounted structure, this embodiment adopts an embedded structure, that is, the first permanent magnet group 21 and the second permanent magnet group 22 are embedded in the rotor core 1, and most of the second magnetic tile structure is far away from the rotor surface and farther away from the stator demagnetization magnetic field, thereby improving the demagnetization rate. In addition, the arrangement in this embodiment can improve the utilization rate of permanent magnets, thereby improving torque performance and motor performance.

[0040] In this embodiment, the embedded first permanent magnet group 21 and the second permanent magnet group usually adopt a V-shaped permanent magnet group or a SPOKE-shaped permanent magnet group. In this embodiment, the first permanent magnet group 21 adopts a V-shaped permanent magnet group and the second permanent magnet group 22 adopts a bar permanent magnet group as an example for explanation, that is, along the circumference of the rotor core 1, there is at least one bar permanent magnet group between the two V-shaped permanent magnet groups, so that the part of the rotor core 1 corresponding to the V-shaped permanent magnet group forms a permanent magnet pole, and the part corresponding to the V-shaped permanent magnet group and the bar permanent magnet group forms a silicon steel pole 32. By changing the layout between the V-shaped permanent magnet group and the bar permanent magnet group, an N-pole magnetic field equivalent to the traditional surface-mounted structure can be formed. Compared with the traditional surface-mounted structure, in this application, both the V-shaped permanent magnet group and the bar permanent magnet group can adopt rectangular magnetic tiles, which are easy to manufacture, and the embedded installation method effectively improves the reliability of the rotor structure.

[0041] Correspondingly, on a cross section perpendicular to the rotor core 1, the first permanent magnet group 21 includes two first magnetic tiles set at an angle, and the magnetizing direction of the first magnetic tiles is perpendicular to the direction of the first magnetic tiles; the second permanent magnet group 22 includes a second magnetic tile extending along the radial direction of the rotor core 1, and the magnetizing direction of the second magnetic tile is tangential to the rotor core 1; between two adjacent first magnetic tiles in the first permanent magnet group 21, between the first magnetic tile in the first permanent magnet group 21 and the second magnetic tile of the adjacent second permanent magnet group 22, and between two second magnetic tiles corresponding to two adjacent second permanent magnet groups 22, the adjacent surface magnetic poles are the same, thereby forming equivalent magnetic poles on the surface of the rotor core 1.

[0042] The thickness of the bar permanent magnet group is smaller than that of the V-type permanent magnet group. The bar permanent magnet group extends along the radial direction of the rotor core 1, and most of its structure is far away from the stator side, which is not easy to demagnetize, thereby reducing the amount of permanent magnets and reducing costs. Compared with the bar permanent magnet group, the V-type permanent magnet group is closer to the stator side as a whole, and selecting thicker permanent magnets can improve the body's anti-demagnetization ability.

[0043] Of course, in other embodiments, the thickness of the bar-shaped permanent magnet group may also be equal to the thickness of the V-shaped permanent magnet group.

[0044] In one embodiment, the rotor core 1 forms a plurality of permanent magnet poles along the circumferential direction, and at least one silicon steel pole 32 is arranged between any two adjacent permanent magnet poles. When only one set of bar permanent magnet groups is arranged between two V-shaped permanent magnet groups, two silicon steel poles 32 are formed between the two permanent magnet poles; when two sets of bar permanent magnet groups are arranged between two V-shaped permanent magnet groups, permanent magnet poles are also formed between two adjacent bar permanent magnet groups, thereby forming a structure in which permanent magnet poles and silicon steel poles 32 alternate one by one.

[0045] In the first example of this embodiment, see Figure 6 The permanent magnetic pole corresponding to the first permanent magnetic pole group 21 on the rotor core 1 is the first permanent magnetic pole 31. A V-shaped groove is provided on the first permanent magnetic pole 31, and the first permanent magnetic pole group 21 is arranged in the V-shaped groove in a one-to-one correspondence. That is, the permanent magnetic pole corresponding to the V-shaped permanent magnetic pole group is the first permanent magnetic pole 31. In this embodiment, two V-shaped permanent magnetic poles and two bar-shaped permanent magnetic poles are alternately arranged for explanation. It can be understood that the above arrangement can form three pairs of magnetic poles.

[0046] In the second example of this embodiment, see Figure 5 There are two adjacent second permanent magnet groups 22 on the rotor core 1, and the second permanent magnet groups 22 extend radially. The permanent magnet poles corresponding to the two second permanent magnet groups 22 on the rotor core 1 are second permanent magnet poles 33. That is, the permanent magnet poles corresponding to the two bar permanent magnet groups are the second permanent magnet poles 33. In this embodiment, two bar permanent magnet groups are arranged on the clockwise side or counterclockwise side of a V-shaped permanent magnet pole for illustration. It can be understood that the above arrangement can form two pairs of magnetic poles.

[0047] Based on the above two examples, a first permanent magnet group 21 and two spaced second permanent magnet groups 22 arranged on one side of the first permanent magnet group 21 form a first unit; two first permanent magnet groups 21 and two second permanent magnet groups 22 are staggered to form a second unit; the alternating pole rotor 100 includes M first units and N second units; wherein M and N are both natural numbers, and M+N≥1; for any rotor with p>1 pairs of poles, it can be realized by combining the first unit and the second unit.

[0048] In one embodiment, the total number of magnetic poles of the silicon steel pole 32, the first permanent magnet pole 31 and the second permanent magnet pole 33 is 2p; the center angle corresponding to the first permanent magnet pole 31 is α, and the value range of α is [0.7*π / p, 1.2*π / p]; the center angle corresponding to the silicon steel pole 32 is β, and the value range of β is [0.7*π / p, 1.2*π / p]; the center angle corresponding to the second permanent magnet pole 33 is γ, and the value range of γ is [0.7*π / p, 1.2*π / p]. For the rotor core 1, the entire rotor core 1 can be regarded as being formed by N1 first permanent magnet poles 31, N2 second permanent magnet poles 33 and N3 silicon steel poles 32, wherein N1, N2 and N3 are all integers, and N2≥0, and N1+N2+N3=2p, N1*α+N2*γ+N3*β=2π. According to the different strengths of the first permanent magnetic pole 31 and the second permanent magnetic pole 33, the central angles corresponding to the silicon steel pole 32, the first permanent magnetic pole 31 and the second permanent magnetic pole 33 do not have to be completely the same.

[0049] In the present embodiment, the values ​​of α and γ may be slightly larger than the value of β. Since the first permanent magnet pole 31 and the second permanent magnet pole 33 are directly formed by the corresponding second magnetic tile, and the silicon steel pole 32 is formed by the interaction of the magnetic field between the adjacent first permanent magnet pole 31 and the second permanent magnet pole 33, the value of β corresponding to the silicon steel pole 32 may be slightly smaller, so that the change of the magnetic field intensity tends to be uniform, the fluctuation during the rotation process is reduced, and the stability of the alternating pole rotor 100 when applied to the motor is ensured.

[0050] Understandable, see Figure 3 When all permanent magnet groups on the rotor core 1 are arranged in the manner of the first example, no two bar-shaped permanent magnet groups are arranged adjacent to each other, that is, no second permanent magnet pole 33 exists.

[0051] In one embodiment, see Figure 3 The outer periphery of the rotor core 1 forms a chamfered surface 11 on both sides corresponding to the first permanent magnet group 21 / the second permanent magnet group 22. The chamfered surface 11 improves the air gap magnetic field when the alternating pole rotor 100 is applied to the electrode, and reduces the torque shift.

[0052] In one embodiment, see Figure 3 The rotor core 1 is provided with a first air slot 13 which penetrates in the radial direction thereof, and the first air slot 13 is provided at both ends of the first permanent magnet group 21. That is, the ends of the two arms of the V-shaped slot form the first air slot 13 which extends along the circumferential direction of the rotor core 1 as a whole. It can be understood that the outer magnetic bridge 12 of the first permanent magnet group 21 is formed between the ends of the V-shaped slot and the outer circle of the rotor core 1. By providing the first air slot 13, the outer magnetic bridge 12 of the first permanent magnet group 21 can be increased, the magnetic leakage can be reduced, and the torque performance can be improved.

[0053] In one embodiment, see Figure 3In the cross section perpendicular to the rotor core 1, the rotor core 1 is provided with a magnetic barrier 14 at the portion corresponding to the outer side of the first permanent magnet group 21. That is, the magnetic barrier 14 extends from the first permanent magnet group 21 to the outer circle of the rotor core 1, so that the magnetic barrier 14 is used as a structure to alleviate the degree of magnetic saturation. The magnetic barrier 14 is formed during the rotation of the rotor structure to reduce magnetic leakage, thereby improving the power density and torque density of the motor and enhancing the overload capacity of the motor.

[0054] In this embodiment, the magnetic barrier 14 may be formed by providing a through slot extending in the circumferential direction between the first permanent magnet group 21 and the outer circumference of the rotor core 1 .

[0055] In one embodiment, see Figure 3 The rotor core 1 is provided with a second air slot 15 which penetrates in the radial direction thereof. The second air slot 15 is provided at one end of the second permanent magnet group 22 which is close to the axis of the rotor core 1, that is, the second air slot 15 is formed at the inner end of the second permanent magnet group 22. The air gap can also increase the length of the magnetic bridge on the inner side of the bar permanent magnet group, reduce magnetic leakage, and improve torque performance.

[0056] Based on the above examples, see Figure 3 There are two second permanent magnet groups 22 arranged adjacent to each other on the rotor core 1, and an inner magnetic bridge 16 is formed between the second air slots 15 corresponding to the two adjacent second permanent magnet groups 22, and the inner magnetic bridge 16 is arranged to be gradually contracted along the direction close to the axis of the rotor core 1. That is, the second air slot 15 includes a first section and a second section connected to each other, wherein the first section extends along the circumferential / tangential direction of the rotor core 1, and the second section is arranged obliquely, thereby forming a cavity structure similar to a triangle, thereby further increasing the length of the magnetic bridge inside the bar permanent magnet group, reducing magnetic leakage, and improving torque performance.

[0057] In summary, the present application proposes the following embodiments:

[0058] In the first embodiment, if Figure 1 As shown, the alternating-pole rotor 100 contains both a V-shaped permanent magnet group and a bar permanent magnet group. The V-shaped permanent magnet group is magnetized in the vertical direction of the two arms of the V-shape, and the bar permanent magnet group is magnetized in the circumferential direction. Both the V-shaped permanent magnet group and the bar permanent magnet group adopt an embedded structure, and are formed by combining the structures in the two second examples, that is, in this embodiment, four bar permanent magnet groups and two oppositely arranged V-shaped permanent magnet groups are included, wherein two bar permanent magnet groups are respectively arranged between the two sides of the two oppositely arranged V-shaped permanent magnet groups, forming a distribution mode in which the permanent magnet poles and the silicon steel poles 32 are alternately distributed along the circumference of the rotor core 1.

[0059] In this embodiment, the central angles corresponding to the first permanent magnet pole 31, the silicon steel pole 32 and the second permanent magnet pole 33 correspond to α=45°, β=45°, γ=45, α+2β+γ=180°=2*pi / p*k, k=1, a V-shaped permanent magnet group, two bar permanent magnet groups and two silicon steel poles 32 constitute a group, and there are a total of k=2 groups.

[0060] Specifically, in the first embodiment, the V-type permanent magnet group is embedded in the rotor core 1 by means of an external magnetic bridge 12, and the bar permanent magnet group is embedded in the surface of the rotor core 1 by means of an external magnetic bridge 12. The V-type permanent magnet groups are not adjacent, and the angles α and β corresponding to the V-type permanent magnet group and the silicon steel pole 32 both satisfy [0.7*pi / 2p, 1.2*pi / 2p]. The thickness W1 of the bar permanent magnet group is less than or equal to W2 of the V-type permanent magnet group, and α is the angle between the position PQ where the gap first exists on the inner side of the silicon steel pole 32 and the origin. The V-shaped angle δ of the two first magnetic tiles of the V-type permanent magnet group is 120°, which satisfies 100° to 145°. Figure 2 The magnetic flux diagram of the first embodiment with p=4 is shown in FIG. 1 . The rotor core 1 can effectively generate a 4-pole magnetic field. Compared with the traditional surface-mounted structure, the permanent magnet group is easy to manufacture using rectangular magnetic tiles, and the embedding method helps to improve the reliability of the rotor structure.

[0061] In the second embodiment, if Figure 3 As shown, the layout of the first permanent magnet group 21 and the second permanent magnet group 22 in the second embodiment is consistent with that in the first embodiment, that is, Figure 5 As shown, the alternating-pole rotor 100 contains both a V-shaped permanent magnet group and a bar permanent magnet group. The V-shaped permanent magnet group is magnetized in the vertical direction of the two arms of the V-shape, and the bar permanent magnet group is magnetized in the circumferential direction. Both the V-shaped permanent magnet group and the bar permanent magnet group adopt an embedded structure, and are formed by combining the structures in the two second examples, that is, in this embodiment, four bar permanent magnet groups and two oppositely arranged V-shaped permanent magnet groups are included, wherein two bar permanent magnet groups are respectively arranged between the two sides of the two oppositely arranged V-shaped permanent magnet groups, forming a distribution mode in which the permanent magnet poles and the silicon steel poles 32 are alternately distributed along the circumference of the rotor core 1.

[0062] In this embodiment, the central angles corresponding to the first permanent magnet pole 31, the silicon steel pole 32 and the second permanent magnet pole 33 correspond to α=45°, β=45°, γ=45, α+2β+γ=180°=2*pi / p*k, k=1, a V-shaped permanent magnet group, two bar permanent magnet groups and two silicon steel poles 32 constitute a group, and there are a total of k=2 groups.

[0063] Specifically, Figure 3As shown, in the first embodiment, the V-type permanent magnet group is embedded in the rotor core 1 by means of an external magnetic bridge 12, and the bar permanent magnet group is embedded in the surface of the rotor core 1 by means of an external magnetic bridge 12. The V-type permanent magnet groups are not adjacent, and the angles α and β corresponding to the V-type permanent magnet group and the silicon steel pole 32 both satisfy [0.7*pi / 2p, 1.2*pi / 2p]. The thickness W1 of the bar permanent magnet group is less than or equal to W2 of the V-type permanent magnet group, and α is the angle between the position PQ where the gap first exists on the inner side of the silicon steel pole 32 and the origin. The V-shaped angle δ of the two first magnetic tiles of the V-type permanent magnet group is 120°, which satisfies 100° to 145°.

[0064] like Figure 3 As shown, the difference between the second embodiment and the first embodiment is that in the p=4 rotor structure of the second embodiment, the two sides of the V-type permanent magnet group, that is, the two sides of P and Q are provided with a first air slot 13 that penetrates the rotor core 1, and its extension is respectively R and S points, and the central angle corresponding to RP and the central angle corresponding to QS are defined as β', β'=0.05~0.20*pi / p. In this embodiment, the angle between the R and S points and the P and Q points can be 10°. The first air slot 13 is conducive to increasing the magnetic bridge outside the V-type permanent magnet group, reducing leakage and improving torque performance. A magnetic barrier 14 structure is provided on the outside of the V-type permanent magnet group, which is conducive to reducing saturation and improving motor efficiency, improving rotor stress, and improving rotor reliability. A second air slot 15 is provided on the inside of the bar permanent magnet group, and the second air slot 15 can also increase the length of the magnetic bridge inside the bar permanent magnet group, reduce leakage and improve torque performance.

[0065] The V-type permanent magnet group and the bar permanent magnet group form a 4-pole magnetic field together with the silicon steel pole 32. The two sides of the outer magnetic bridge 12 of the V-type permanent magnet group / bar permanent magnet group adopt a cut arc structure; the cut arc structure is conducive to improving the air gap magnetic field and reducing torque fluctuations. The inner magnetic bridge 16 of the bar permanent magnet adopts a triangular structure, which is conducive to increasing the length of the magnetic bridge and improving the structural reliability.

[0066] like Figure 4 The magnetic flux diagram of the second embodiment with p=4 is shown in FIG. The alternating pole rotor 100 can effectively generate a 4-pole magnetic field. Compared with the traditional surface-mounted structure, the permanent magnet is easy to manufacture using rectangular magnetic tiles, and the embedded method helps to improve the reliability of the rotor structure.

[0067] Figure 5 The figure is a comparison diagram of the utilization rate and demagnetization rate of permanent magnets according to the present invention with p=4. The three data in the table correspond to the traditional surface-mounted structure, the first embodiment and the second embodiment from left to right. It can be seen from the figure that the utilization rate of permanent magnets in the first embodiment and the second embodiment is increased and the torque performance is improved compared with the traditional surface-mounted structure. At the same time, since most of the permanent magnets in the first embodiment and the second embodiment are far away from the rotor surface and farther than the stator demagnetization magnetic field, the demagnetization rate is greatly improved.

[0068] In the third embodiment, if Figure 6 As shown, the third embodiment can be regarded as half of the first embodiment in the circumferential direction, that is, the third embodiment includes a group of V-shaped permanent magnets and two groups of bar permanent magnets, thereby forming a two-pole magnetic field.

[0069] In the fourth embodiment, if Figure 7 As shown, the alternating-pole rotor 100 includes two groups of V-shaped permanent magnet groups and two groups of bar-shaped permanent magnet groups. The V-shaped permanent magnet groups and the bar-shaped permanent magnet groups are alternately arranged along the circumferential direction, thereby forming a three-pole magnetic field.

[0070] It can be deduced that any rotor with p>1 pole pair can be realized by combining the first unit and the second unit mentioned above. The specific combination is shown in the following table:

[0071]

[0072] like Figure 8 As shown, in the fifth embodiment, the rotor core 1 contains both a radially magnetized V-shaped permanent magnet group and a tangentially magnetized bar permanent magnet group. The V-shaped permanent magnet group is magnetized along the tangential direction, and the bar permanent magnet group is magnetized with the axis inward or outward. This embodiment can be regarded as a combination of the first unit and the second unit, and in the first unit, the V-shaped permanent magnet group, the silicon steel pole 32, and the corresponding parts of the two adjacent bar permanent magnet groups occupy α=36°, β=36°, γ=36, respectively, wherein the angle A1=α+2β+γ=144=2*pi / p*k, k=2, and one V-shaped permanent magnet group, two bar permanent magnet groups and two silicon steel poles 32 constitute a group. In the second unit, the V-type permanent magnet group, the bar permanent magnet group and the silicon steel pole 32 occupy α=36°, β=36°, γ=36, respectively, wherein the angle B1=2α+4β=216=2*pi / p*k, k=3, two V-type permanent magnet groups, two bar permanent magnet groups and two silicon steel poles 32 form a group. The total angle of A1 and B1 is 360°, constituting a whole circumference of the rotor, and the number of second magnetic tile pole pairs formed is p=5.

[0073] In addition, the present invention further provides a motor, which includes a stator and the alternating pole rotor 100 as described above, wherein the alternating pole rotor 100 is rotatably disposed in the stator. Since the motor includes the alternating pole rotor 100 as described above, the motor has all the beneficial effects of the alternating pole rotor 100, which will not be described in detail here.

[0074] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An alternating pole rotor, characterized in that: The alternating pole rotor comprises: Rotor core; A plurality of permanent magnet groups, the plurality of permanent magnet groups are arranged in the rotor core at intervals along the circumferential direction of the rotor core, the plurality of permanent magnet groups include a first permanent magnet group and a second permanent magnet group, the first permanent magnet group forms a V-shaped structure with an opening toward the outer circle of the rotor core, the second permanent magnet group is a strip structure extending along the radial direction of the rotor core, and the magnetization directions of the first permanent magnet group and the second permanent magnet group are inconsistent; Wherein, second permanent magnet groups are arranged on both sides of the first permanent magnet group along the circumferential direction of the rotor core, and silicon steel poles are formed between the first permanent magnet group and the adjacent second permanent magnet group.

2. The alternating-pole rotor according to claim 1, characterized in that The first permanent magnet group and two spaced second permanent magnet groups arranged on one side of the first permanent magnet group form a first unit; the two first permanent magnet groups and the two second permanent magnet groups are staggered to form a second unit; the alternating pole rotor includes M first units and N second units; wherein M and N are both natural numbers, and M+N≥1.

3. The alternating-pole rotor according to claim 2, characterized in that: The portion of the rotor core corresponding to the first permanent magnet group forms a first permanent magnet pole, and a second permanent magnet pole is formed between two adjacent second permanent magnet groups. The total number of magnetic poles of the silicon steel pole, the first permanent magnet pole and the second permanent magnet pole is 2p; The central angle corresponding to the first permanent magnet pole is α, and the value range of α is [0.7*π / p, 1.2*π / p]; The central angle corresponding to the silicon steel pole is β, and the value range of β is [0.7*π / p, 1.2*π / p]; The central angle corresponding to the second permanent magnet pole is γ, and the value range of γ is [0.7*π / p, 1.2*π / p].

4. The alternating-pole rotor according to claim 1, characterized in that: On a cross section perpendicular to the rotor core, the first permanent magnet group includes two first magnetic tiles arranged at an angle, and the magnetization direction of the first magnetic tile is perpendicular to the direction of the first magnetic tile; and / or, The second permanent magnet group includes a second magnetic tile extending in the radial direction of the rotor core, and the magnetization direction of the second magnetic tile is tangential to the rotor core; Furthermore, the adjacent surface magnetic poles of the first magnetic tile / the second magnetic tile and the adjacent first magnetic tile / the second magnetic tile are the same.

5. The alternating-pole rotor according to any one of claims 1 to 4, characterized in that The outer circumference of the rotor core forms a chamfered surface corresponding to two sides of the first permanent magnet group / the second permanent magnet group.

6. The alternating-pole rotor according to any one of claims 1 to 4, characterized in that The rotor core is provided with first air slots penetrating in the radial direction thereof, and the first air slots are provided at two ends of the first permanent magnet group.

7. The alternating-pole rotor according to any one of claims 1 to 4, characterized in that On a cross section perpendicular to the rotor core, a portion of the rotor core corresponding to the outer side of the first permanent magnet group is provided with a magnetic barrier.

8. The alternating-pole rotor according to any one of claims 1 to 4, characterized in that The rotor core is provided with a second air slot which penetrates in the radial direction thereof, and the second air slot is provided at one end of the second permanent magnet group close to the axis center of the rotor core.

9. The alternating-pole rotor according to claim 8, characterized in that There are two second permanent magnet groups arranged adjacent to each other on the rotor core, and an internal magnetic bridge is formed between the second air slots corresponding to the two adjacent second permanent magnet groups. The internal magnetic bridge is gradually tapered in a direction close to the axis of the rotor core.

10. A motor, characterized in that: The motor comprises: stator; The alternating pole rotor according to any one of claims 1 to 9, wherein the alternating pole rotor is rotatably disposed in the stator.

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