Rotor structure and motor having the same

Abstract

The present invention provides a rotor structure and a motor having the same. The rotor structure comprises: a rotor body, a plurality of main permanent magnet slots are provided on the rotor body, auxiliary permanent magnet slots are provided at the two sides of each main permanent magnet slot extending in the radial direction of the rotor body, a main permanent magnet is provided in each main permanent magnet slot, and an auxiliary permanent magnet is provided in each auxiliary permanent magnet slot. Auxiliary permanent magnets are provided at both sides of the main permanent magnet, which changes the magnetic circuit direction of the demagnetization magnetic field, improves the working point of the main permanent magnet, reduces the demagnetization area of ​​the main permanent magnet, thereby improving the anti-demagnetization ability of the motor, and at the same time, the auxiliary permanent magnet provides magnetic flux to the air gap, improves the magnetic flux of the motor, reduces the operating current of the motor, reduces the copper loss of the motor, and improves the efficiency of the motor.

Description

Technical Field

[0001] The present invention relates to the technical field of motor equipment, and in particular to a rotor structure and a motor having the same. Background Art

[0002] The motor with permanent magnet tangential magnetization structure has the "magnetic concentration" effect and can produce higher air gap magnetic density than the permanent magnet radial magnetization motor, which makes the motor have a larger torque to current ratio and torque to volume ratio. It is increasingly used in servo systems, electric traction, office automation, household appliances and other occasions.

[0003] The existing tangential permanent magnet motor adopts a magnetic circuit structure with a single permanent magnet in parallel, so the working point of the rotor permanent magnet is lower than that of the radial permanent magnet motor, which easily causes the motor efficiency to decrease, and there is a risk of demagnetization in harsh environments, making the motor unable to operate. Summary of the invention

[0004] The main purpose of the present invention is to provide a rotor structure and a motor having the same, so as to solve the problem of low motor efficiency in the prior art.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a rotor structure is provided, including: a rotor body, a plurality of main permanent magnet slots are opened on the rotor body, auxiliary permanent magnet slots are arranged at two sides of each main permanent magnet slot extending in the radial direction of the rotor body, a main permanent magnet is arranged in each main permanent magnet slot, and an auxiliary permanent magnet is arranged in each auxiliary permanent magnet slot, wherein the distance between the auxiliary permanent magnet slots located on both sides of the same main permanent magnet slot is arranged to gradually increase outward along the radial direction of the rotor body.

[0006] Furthermore, the first end of the main permanent magnet slot is arranged close to the axial hole of the rotor body, the second end of the main permanent magnet slot is arranged away from the axial hole along the radial direction of the rotor body, the first end of the auxiliary permanent magnet slot is arranged close to the axial hole, the second end of the auxiliary permanent magnet slot is arranged away from the axial hole, and the plane where the end face of the second end of the main permanent magnet slot is located intersects with the auxiliary permanent magnet slot.

[0007] Furthermore, the central angle corresponding to the line connecting the ends of the auxiliary permanent magnets on the same magnetic pole close to the outer edge of the rotor body is I, and the central angle formed by the geometric center lines of two adjacent main permanent magnets is J, wherein I / J≥0.08.

[0008] Furthermore, I / J≤0.3.

[0009] Further, the side of the auxiliary permanent magnet opposite to the main permanent magnet has the same polarity.

[0010] Furthermore, the auxiliary permanent magnet is in a long strip shape, and the angle formed between the geometric center line of the long side direction of the auxiliary permanent magnet and the geometric center line of the main permanent magnet slot is A, wherein 70°≥A≥20°.

[0011] Furthermore, the maximum distance between the end of the auxiliary permanent magnet close to the shaft hole and the outer edge of the main permanent magnet close to the rotor body is B, and the length of the main permanent magnet along the radial direction of the rotor body is C, wherein 0.18≥B / C.

[0012] Furthermore, the minimum distance between the end of the auxiliary permanent magnet close to the outer edge of the rotor body and the outer edge of the rotor body is F, wherein 1.5≥F / δ≥1, and δ is the air gap length between the stator and the rotor body.

[0013] Further, the thickness of the auxiliary permanent magnet is D, and the thickness of the rotor body is O, wherein 0.4≥D / O≥0.05.

[0014] Further, the coercive force of the auxiliary permanent magnet is higher than the coercive force of the main permanent magnet.

[0015] Further, the end of the auxiliary permanent magnet slot away from the shaft hole is arranged at a distance from the outer edge of the rotor body to form a first magnetic isolation bridge, and the thickness of the first magnetic isolation bridge along the radial direction of the rotor body is uniformly arranged.

[0016] Further, the end of the auxiliary permanent magnet slot close to the shaft hole is arranged at a distance from the main permanent magnet slot to form a second magnetic isolation bridge, and the thickness of the second magnetic isolation bridge along the radial direction of the rotor body is uniformly arranged.

[0017] Further, the auxiliary permanent magnet is an arc-shaped structure, and the auxiliary permanent magnet is arranged in a curved manner toward the magnetic pole center line of the rotor core, or the auxiliary permanent magnet is arranged in a curved manner away from the magnetic pole center line of the rotor core.

[0018] Further, the central angle corresponding to the line of the shortest distance between the ends of the auxiliary permanent magnets on the same magnetic pole close to the outer edge of the rotor body is K, wherein 0.3≥K / J≥0.1.

[0019] Furthermore, the arc of the auxiliary permanent magnet is L1, wherein 85°≤L1≤90°.

[0020] Further, one end of the auxiliary permanent magnet slot close to the shaft hole is connected to the main permanent magnet slot, and one end of the auxiliary permanent magnet slot close to the outer edge of the rotor body is arranged at a distance from the main permanent magnet slot.

[0021] Furthermore, the maximum distance between the end of the auxiliary permanent magnet close to the shaft hole and the outer edge of the main permanent magnet close to the rotor body is D1, and the length of the main permanent magnet along the radial direction of the rotor body is C, wherein D1 / C≤0.4.

[0022] Furthermore, the long side of the auxiliary permanent magnet is extended along the circumferential direction of the rotor body, the central angle formed by the line connecting the two ends of the auxiliary permanent magnet and the shaft hole is C1, and the angle of the magnetic pole of the rotor body is B1, wherein 0.3≥C1 / B1≥0.1.

[0023] Further, one end of the auxiliary permanent magnet slot facing the main permanent magnet slot is arranged at a distance from the main permanent magnet slot to form a third magnetic isolation bridge, and the width of the third magnetic isolation bridge is F1, wherein 2≥F1 / δ≥1.

[0024] Further, the thickness of the auxiliary permanent magnet along the radial direction of the rotor body is H1, wherein 0.4≥H1 / O≥0.05.

[0025] Furthermore, an air slot is formed between the end of the auxiliary permanent magnet facing the magnetic pole centerline and the auxiliary permanent magnet slot, and a fourth magnetic isolation bridge is formed between the air slot and the outer edge of the rotor body. The thickness of the fourth magnetic isolation bridge is G, wherein 1.8≥G / δ≥0.8.

[0026] Furthermore, the auxiliary permanent magnet slots are connected to the main permanent magnet slots.

[0027] Further, the auxiliary permanent magnets located on both sides of the main permanent magnet have different lengths.

[0028] Furthermore, the auxiliary permanent magnets located on both sides of the same magnetic pole center line are arranged symmetrically with respect to the magnetic pole center line.

[0029] Furthermore, the auxiliary permanent magnets located on both sides of the same magnetic pole center line have different lengths.

[0030] Further, the direction of the magnetic poles of the auxiliary permanent magnets facing the outer edge of the rotor body is the same as the direction of the magnetic poles of the rotor body.

[0031] Furthermore, the magnetization direction of the main permanent magnet is along the circumferential direction of the rotor body, and the magnetization direction of the auxiliary permanent magnet is along the radial direction of the rotor body. According to another aspect of the present invention, a motor is provided, comprising a rotor structure, which is the above-mentioned rotor structure.

[0032] By applying the technical solution of the present invention, auxiliary permanent magnets are arranged on both sides of the main permanent magnet, which changes the magnetic circuit direction of the demagnetization magnetic field, increases the working point of the main permanent magnet, and reduces the demagnetization area of ​​the main permanent magnet, thereby improving the anti-demagnetization ability of the motor. At the same time, the auxiliary permanent magnets provide magnetic flux to the air gap, which increases the magnetic flux of the motor, reduces the operating current of the motor, reduces the copper loss of the motor, and improves the efficiency of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0034] Figure 1 A schematic structural diagram of a first embodiment of a rotor structure according to the present invention is shown;

[0035] Figure 2 A schematic structural diagram of a second embodiment of a rotor structure according to the present invention is shown;

[0036] Figure 3 A schematic structural diagram of a third embodiment of a rotor structure according to the present invention is shown;

[0037] Figure 4 A schematic structural diagram showing a fourth embodiment of a rotor structure according to the present invention is shown;

[0038] Figure 5 A schematic structural diagram of a fifth embodiment of a rotor structure according to the present invention is shown;

[0039] Figure 6 A schematic structural diagram showing a sixth embodiment of a rotor structure according to the present invention is shown;

[0040] Figure 7 A schematic structural diagram of a seventh embodiment of a rotor structure according to the present invention is shown;

[0041] Figure 8 A schematic structural diagram showing an eighth embodiment of a rotor structure according to the present invention is shown;

[0042] Fig. 9 A schematic structural diagram showing a ninth embodiment of a rotor structure according to the present invention is shown;

[0043] Fig.10 A schematic structural diagram of a tenth embodiment of a rotor structure according to the present invention is shown;

[0044] Fig.11 A schematic structural diagram of an eleventh embodiment of a rotor structure according to the present invention is shown;

[0045] Fig.12 A schematic structural diagram of a twelfth embodiment of a rotor structure according to the present invention is shown;

[0046] Fig.13 A schematic structural diagram of a thirteenth embodiment of a rotor structure according to the present invention is shown;

[0047] Fig.14 A schematic diagram of rotor structure demagnetization in the prior art is shown;

[0048] Fig.15 A schematic diagram of a demagnetization structure of a fourteenth embodiment of a rotor structure according to the present invention is shown;

[0049] Fig.16 A schematic diagram of a demagnetization structure of a fifteenth embodiment of a rotor structure according to the present invention is shown;

[0050] Fig.17 A schematic diagram of a demagnetization structure of a sixteenth embodiment of a rotor structure according to the present invention is shown;

[0051] Fig.18 A comparison diagram of the demagnetization area of ​​the motor according to the present invention and the motor of the prior art is shown;

[0052] Fig.19 A comparison diagram of the flux linkage sizes of the motor according to the present invention and the motor in the prior art is shown.

[0053] The above drawings include the following reference numerals:

[0054] 10. rotor body; 11. shaft hole; 12. first magnetic isolation bridge; 13. second magnetic isolation bridge; 14. third magnetic isolation bridge; 15. fourth magnetic isolation bridge;

[0055] 20. Main permanent magnet;

[0056] 30. Auxiliary permanent magnet;

[0057] 40. Air tank. DETAILED DESCRIPTION

[0058] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0059] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0060] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0061] Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein. It should be understood that these embodiments are provided to make the disclosure of the present application thorough and complete, and to fully convey the concepts of these exemplary embodiments to those of ordinary skill in the art. In the accompanying drawings, for the sake of clarity, the thickness of the layers and regions may be enlarged, and the same reference numerals are used to represent the same devices, and thus their descriptions will be omitted.

[0062] Combination Figures 1 to 13 , Figures 15 to 19 As shown, according to a specific embodiment of the present application, a rotor structure is provided, including: a rotor body 10, a plurality of main permanent magnet slots are provided on the rotor body 10, and auxiliary permanent magnet slots are provided at two sides extending along the radial direction of the rotor body 10 of each main permanent magnet slot, each main permanent magnet slot is provided with a main permanent magnet 20, and each auxiliary permanent magnet slot is provided with an auxiliary permanent magnet 30, wherein, as Figures 1 to 3 As shown in FIG. 1 , the distance between the auxiliary permanent magnet slots on both sides of the same main permanent magnet slot is gradually increased outward along the radial direction of the rotor body 10. Alternatively, as Figure 4 and Figure 5As shown, the distance between the auxiliary permanent magnet slots located on both sides of the same main permanent magnet slot is gradually increased inwardly along the radial direction of the rotor body 10. This arrangement can further optimize the magnetic circuit of the rotor structure and improve the anti-demagnetization ability and efficiency of the motor with the rotor structure.

[0063] In this embodiment, auxiliary permanent magnets are arranged on both sides of the main permanent magnet, which changes the magnetic circuit direction of the demagnetization magnetic field, increases the working point of the main permanent magnet, and reduces the demagnetization area of ​​the main permanent magnet, thereby improving the anti-demagnetization ability of the motor. At the same time, the auxiliary permanent magnets provide magnetic flux to the air gap, increase the magnetic flux of the motor, reduce the operating current of the motor, reduce the copper loss of the motor, and improve the efficiency of the motor.

[0064] Among them, the first end of the main permanent magnet slot is arranged close to the shaft hole 11 of the rotor body 10, the second end of the main permanent magnet slot is arranged away from the shaft hole 11 along the radial direction of the rotor body 10, the first end of the auxiliary permanent magnet slot is arranged close to the shaft hole 11, the second end of the auxiliary permanent magnet slot is arranged away from the shaft hole 11, and the plane where the end face of the second end of the main permanent magnet slot is located intersects with the auxiliary permanent magnet slot. This arrangement can effectively improve the magnetic flux of the motor, reduce the area of ​​the demagnetization region, reduce the operating current of the motor, reduce the copper loss of the motor, and improve the efficiency of the motor. Specifically, Fig.14 As shown, the demagnetization area in the prior art is W1. Figures 15 to 17 The areas of the demagnetization regions W2, W3, and W4 are all smaller than W1.

[0065] Further, the central angle corresponding to the line between the ends of the auxiliary permanent magnets 30 on the same magnetic pole close to the outer edge of the rotor body 10 is I, and the central angle formed between the geometric center lines of two adjacent main permanent magnets 20 is J, wherein I / J≥0.08. Preferably, I / J≤0.3. Such a setting can achieve the best motor efficiency.

[0066] like Figures 1 to 8 As shown, the auxiliary permanent magnet 30 has the same polarity as the side opposite to the main permanent magnet 20. The magnetic circuit of the rotor structure is further optimized, and the anti-demagnetization capability of the motor having the rotor structure is improved.

[0067] like Figure 1 As shown, the auxiliary permanent magnet 30 is in the shape of a long strip, and the angle formed between the geometric center line of the long side direction of the auxiliary permanent magnet 30 and the geometric center line of the main permanent magnet slot is A, where 70°≥A≥20°. The maximum distance between the end of the auxiliary permanent magnet 30 close to the shaft hole 11 and the outer edge of the main permanent magnet 20 close to the rotor body 10 is B, and the length of the main permanent magnet 20 along the radial direction of the rotor body 10 is C, where 0.18≥B / C. This arrangement can improve the anti-demagnetization ability and efficiency of the motor.

[0068] In order to further improve the motor efficiency, the minimum distance between the end of the auxiliary permanent magnet 30 close to the outer edge of the rotor body 10 and the outer edge of the rotor body 10 is F, wherein 1.5≥F / δ≥1, and δ is the air gap length between the stator and the rotor body 10. The thickness of the auxiliary permanent magnet 30 is D, and the thickness of the rotor body 10 is O, wherein 0.4≥D / O≥0.05.

[0069] Furthermore, the coercive force of the auxiliary permanent magnet 30 is higher than the coercive force of the main permanent magnet 30. This arrangement can improve the reliability of the motor.

[0070] like Figure 2 As shown, the end of the auxiliary permanent magnet slot away from the axial hole 11 is set at a distance from the outer edge of the rotor body 10 to form a first magnetic isolation bridge 12. The thickness of the first magnetic isolation bridge 12 along the radial direction of the rotor body 10 is uniformly set. The end of the auxiliary permanent magnet slot close to the axial hole 11 is set at a distance from the main permanent magnet slot to form a second magnetic isolation bridge 13, and the thickness of the second magnetic isolation bridge 13 along the radial direction of the rotor body 10 is uniformly set. This arrangement can improve the anti-demagnetization ability and efficiency of the motor while ensuring the structural strength of the motor. Wherein, Z is the auxiliary permanent magnet slot.

[0071] like Figure 4 and Figure 5 As shown, the auxiliary permanent magnet 30 is an arc-shaped structure, and the auxiliary permanent magnet 30 is arranged in a curved manner toward the magnetic pole center line of the rotor core. Figure 3 As shown, the auxiliary permanent magnet 30 is arranged in a curved manner away from the magnetic pole center line of the rotor core. Such an arrangement can also improve the anti-demagnetization capability of the motor.

[0072] In order to further improve the motor's anti-demagnetization ability and efficiency, such as Figure 3 As shown, the center angle corresponding to the shortest distance between the ends of the auxiliary permanent magnets 30 on the same magnetic pole close to the outer edge of the rotor body 10 is K, where 0.3≥K / J≥0.1. The arc of the auxiliary permanent magnet 30 is L1, where 85°≤L1≤90°.

[0073] like Figure 6 , Fig.11 , Fig.12 , Fig.13 , Fig.17As shown, one end of the auxiliary permanent magnet slot close to the shaft hole 11 is connected to the main permanent magnet slot, and one end of the auxiliary permanent magnet slot close to the outer edge of the rotor body 10 is set at a distance from the main permanent magnet slot. There is no magnetic isolation bridge between the inner side of the auxiliary permanent magnet and the main permanent magnet slot, and the auxiliary permanent magnet has reduced magnetic leakage on the inner side, thereby improving the magnetic flux of the motor, and further guiding the demagnetization magnetic field to the outer side of the rotor, so that the demagnetization area of ​​the inner side of the permanent magnet is further reduced, thereby improving the anti-demagnetization ability of the main permanent magnet, and then improving the demagnetization ability of the motor.

[0074] In order to further reduce the area of ​​the demagnetization region, reduce the operating current of the motor, and reduce the copper loss of the motor, the maximum distance between the end of the auxiliary permanent magnet 30 close to the shaft hole 11 and the outer edge of the main permanent magnet 20 close to the rotor body 10 is D1, and the length of the main permanent magnet 20 along the radial direction of the rotor body 10 is C, where D1 / C≤0.4. The long side of the auxiliary permanent magnet 30 is extended along the circumference of the rotor body 10, and the central angle formed by the line connecting the two ends of the auxiliary permanent magnet 30 and the shaft hole 11 is C1, and the angle of the magnetic pole of the rotor body 10 is B1, where 0.3≥C1 / B1≥0.1.

[0075] like Fig. 9 As shown, one end of the auxiliary permanent magnet slot facing the main permanent magnet slot is arranged at a distance from the main permanent magnet slot to form a third magnetic isolation bridge 14, and the width of the third magnetic isolation bridge 14 is F1, wherein 2≥F1 / δ≥1. This arrangement can improve the anti-demagnetization ability and efficiency of the motor while ensuring the strength of the rotor structure.

[0076] Preferably, the thickness of the auxiliary permanent magnet 30 along the radial direction of the rotor body 10 is H1, wherein 0.4≥H1 / O≥0.05. This arrangement can effectively improve the anti-demagnetization capability and efficiency of the motor.

[0077] An air slot 40 is formed between the end of the auxiliary permanent magnet 30 facing the magnetic pole centerline and the auxiliary permanent magnet slot, and a fourth magnetic isolation bridge 15 is formed between the air slot 40 and the outer edge of the rotor body 10. The thickness of the fourth magnetic isolation bridge 15 is G, wherein 1.8≥G / δ≥0.8.

[0078] According to another embodiment of the present application, the auxiliary permanent magnet slots may be arranged to be connected with the main permanent magnet slots, and the specific connection mode may be middle connection or end connection.

[0079] like Fig.12 As shown in FIG. 1 , the lengths of the auxiliary permanent magnets 30 located on both sides of the main permanent magnet 20 are different. Fig.11 As shown in FIG. 1 , the auxiliary permanent magnets 30 located on both sides of the same magnetic pole center line are arranged symmetrically about the magnetic pole center line. Fig.13As shown at P in FIG. 1 , the lengths of the auxiliary permanent magnets 30 located on both sides of the same magnetic pole center line are different.

[0080] According to another embodiment of the present application, the magnetic pole direction of the auxiliary permanent magnet 30 facing the outer edge of the rotor body 10 is the same as the magnetic pole direction of the rotor body 10. The magnetization direction of the main permanent magnet 20 is along the circumferential direction of the rotor, and the magnetization direction of the auxiliary permanent magnet 30 is along the radial direction of the rotor. Such an arrangement can effectively improve the anti-demagnetization ability and efficiency of the rotor structure. Preferably, the material of the main permanent magnet is ferrite, and the material of the auxiliary permanent magnet is neodymium iron boron.

[0081] The rotor structure in the above embodiment can also be used in the technical field of motor equipment. That is, according to another aspect of the present invention, a motor is provided, including a rotor structure, and the rotor structure is the rotor structure in the above embodiment.

[0082] Specifically, the rotor adopting this structure solves the problems in the prior art of poor motor anti-demagnetization ability, low motor flux, large operating current, large motor copper loss, low efficiency, and easy demagnetization of auxiliary permanent magnets.

[0083] The rotor structure of the present application is a permanent magnet synchronous motor rotor structure, comprising: a rotor core, n tangential permanent magnets, which are arranged on the rotor core along the circumference of the rotor core and extend along the radial direction of the rotor core, and the opposite sides of every two adjacent tangential permanent magnets have the same polarity, wherein the tangential permanent magnets are main permanent magnets, and auxiliary permanent magnets are arranged on the magnetic poles formed between the main permanent magnets, the auxiliary permanent magnets are close to the outside of the main permanent magnets, and a spacing distance is left between the auxiliary permanent magnets on the same magnetic pole, and the angle occupied by the distance is set to I, and the center line angle of two adjacent main permanent magnets is set to J, and I and J should satisfy the following relationship: I / J≥0.08, the inner side of the auxiliary permanent magnet is closer to the main permanent magnet than the outer side, the side of the permanent magnet close to the rotor core shaft hole is the inner side of the permanent magnet, and the side of the permanent magnet close to the outer circle of the rotor core is the outer side of the permanent magnet. Since the tangential permanent magnet motor adopts a magnetic circuit structure with a single permanent magnet in parallel, the working point of the rotor permanent magnet is lower than that of the radial permanent magnet motor, and the motor has poor anti-demagnetization ability. By arranging auxiliary permanent magnets on the outside of the main permanent magnets and leaving a spacing distance between the auxiliary permanent magnets, the magnetic flux of the main permanent magnets is transferred to the air gap without affecting the magnetic flux of the motor. At the same time, it serves as a magnetic conduction channel to guide the demagnetization magnetic field to be transferred to the auxiliary permanent magnets, changing the magnetic circuit direction of the demagnetization magnetic field. The auxiliary permanent magnets guide the demagnetization magnetic field to the outside of the rotor, reducing the size of the demagnetization magnetic field borne by the main permanent magnet, thereby increasing the working point of the tangential main permanent magnet, reducing the demagnetization area on the outside and inside of the tangential permanent magnet, and improving the anti-demagnetization ability of the motor.

[0084] Furthermore, a distance is left between the two auxiliary permanent magnets to facilitate the main permanent magnet to provide magnetic flux to the air gap, increase the motor magnetic flux, reduce the operating current, and thus reduce the copper loss, so I / J ≥ 0.0.08. However, when I / J > 0.3, the magnetic field of the auxiliary permanent magnet acts more on the main permanent magnet, increasing the demagnetization of the main permanent magnet and reducing the motor's anti-demagnetization ability.

[0085] An auxiliary permanent magnet is arranged on the side where the main permanent magnet provides magnetic flux. The side opposite to the main permanent magnet has the same polarity, that is, the magnetization direction of the auxiliary permanent magnet is opposite to that of the main permanent magnet, and the magnetization direction of the auxiliary permanent magnet is opposite to the direction of the rotor pole. The auxiliary permanent magnet extends radially along the rotor, the auxiliary permanent magnet is close to the outside of the main permanent magnet, the inner side of the auxiliary permanent magnet is closer to the main permanent magnet than the outer side, the side of the permanent magnet close to the shaft hole of the rotor core is the inner side of the permanent magnet, and the side of the permanent magnet close to the outer circle of the rotor core is the outer side of the permanent magnet. The side opposite to the main permanent magnet has the same polarity setting, which changes the magnetic path direction of the demagnetization magnetic field. The auxiliary permanent magnet guides the demagnetization magnetic field to the outside of the rotor, reduces the size of the demagnetization magnetic field borne by the main permanent magnet, thereby increasing the working point tangential to the main permanent magnet and improving the anti-demagnetization ability of the motor. The side opposite to the main permanent magnet has the same polarity, that is, the magnetization direction of the main permanent magnet is opposite to the magnetization direction of the auxiliary permanent magnet. The auxiliary permanent magnet is inclined relative to the main permanent magnet, the auxiliary permanent magnet is not borne by the demagnetization magnetic field, and the auxiliary permanent magnet is not easily demagnetized.

[0086] The inner side of the auxiliary permanent magnet is closer to the main permanent magnet than the outer side. The auxiliary permanent magnet is inclined relative to the center line of the main permanent magnet. There is an angle A between the center line of the auxiliary permanent magnet and the center line of the main permanent magnet. The optimal value range of A is: 70°≥A≥20°. If A<20°, the magnetic fields of the auxiliary permanent magnet and the main permanent magnet are opposite and the angle is small. The magnetic field of the auxiliary permanent magnet will increase the demagnetization of the main permanent magnet, making the magnetic flux density in the demagnetization area of ​​the main permanent magnet lower, and the anti-demagnetization ability of the motor decreases. When A>70°, the auxiliary permanent magnet has little effect on improving the demagnetization effect, but will increase the amount of permanent magnets used and increase the cost of permanent magnets. Therefore, when 70°≥A≥20°, the effect is optimal.

[0087] The auxiliary permanent magnet is close to the outside of the main permanent magnet, and the distance between the inside of the auxiliary permanent magnet and the outside of the main permanent magnet is set to B. The radial length of the main permanent magnet is set to C. B and C should satisfy the following relationship: 0.18≥B / C. Adding auxiliary permanent magnets can guide the demagnetization magnetic field to the outside of the rotor, but the auxiliary permanent magnets themselves also have a magnetic field that demagnetizes the main permanent magnets. When B / C>0.18, the area of ​​the demagnetization region outside the main permanent magnet changes little. When the demagnetization magnetic field is small, the demagnetization rate of the motor increases instead. Therefore, 0.18≥B / C, which not only reduces the area of ​​the inner demagnetization region of the main permanent magnet, but also reduces the area of ​​the demagnetization region outside the main permanent magnet.

[0088] The auxiliary permanent magnet is close to the outer circle of the rotor core, and there is a distance between the auxiliary permanent magnet and the outer circle of the rotor core. The distance is set to F, and the air gap length between the stator and the rotor of the motor is set to δ. The ratio of F / δ should satisfy the following relationship: 1.5≥F / δ≥1. The auxiliary permanent magnet also provides magnetic flux to the air gap. When F / δ<1, the distance between the auxiliary permanent magnet and the outer circle of the rotor is relatively close, which is not conducive to the stamping of the rotor core mold. The rotor processing technology is complicated, so F / δ≥1. When F / δ>1.5, the leakage magnetic flux of the auxiliary permanent magnet increases and the utilization rate of the permanent magnet decreases, so 1.5≥F / δ.

[0089] The thickness of the auxiliary permanent magnet is smaller than that of the main permanent magnet. The thickness of the auxiliary permanent magnet is set to D, the thickness of the main permanent magnet is set to O, and the ratio of D / O should satisfy the following relationship: 0.4≥D / O≥0.05. The simulation study found that if the main permanent magnet is, when D / O>0.4mm, the thickness of the auxiliary permanent magnet increases, the auxiliary permanent magnet generates a demagnetization magnetic field, and acts on the main permanent magnet. The synthetic demagnetization magnetic field borne by the main permanent magnet increases, the demagnetization rate of the main permanent magnet increases, and the motor's anti-demagnetization ability decreases. When D / O<0.05, the improvement on demagnetization is not obvious. Therefore, when 0.4≥D / O≥0.05, the auxiliary permanent magnet mainly plays the role of changing the magnetic circuit direction of the demagnetization magnetic field and guiding the direction of the demagnetization magnetic field. The thickness of the auxiliary permanent magnet itself is not large, and the auxiliary permanent magnet is tilted relative to the main permanent magnet. The demagnetization effect on the main permanent magnet is small, and the demagnetization area of ​​the main permanent magnet is concentrated at the outer corner position. Under this design, not only the area of ​​the demagnetization area on the inside of the main permanent magnet is reduced, but also the inner side is not demagnetized when the demagnetization magnetic field is small. At the same time, the area of ​​the demagnetization area on the outside of the main permanent magnet is reduced, thereby improving the motor's anti-demagnetization ability.

[0090] The coercive force of the auxiliary permanent magnet is higher than that of the main permanent magnet, and the remanence of the auxiliary permanent magnet is higher than that of the main permanent magnet. For example, the material of the main permanent magnet is ferrite, and the material of the auxiliary permanent magnet is neodymium iron boron. The price of ferrite is low, and the price of neodymium iron boron is high. Using two kinds of magnetic materials, and the main permanent magnet is ferrite, can reduce the overall cost of the motor. At the same time, the outer auxiliary permanent magnet is neodymium iron boron, and the auxiliary permanent magnet provides magnetic flux to the air gap, improves the magnetic flux of the motor, reduces the running current of the motor, and reduces the copper loss of the motor.

[0091] The main permanent magnet and the auxiliary permanent magnet may also be made of the same material, such as both the main permanent magnet and the auxiliary permanent magnet are ferrite, or both the main permanent magnet and the auxiliary permanent magnet are neodymium iron boron.

[0092] Auxiliary permanent magnets are placed in auxiliary permanent magnet slots, and a distance is left between the outer side of the auxiliary permanent magnet slot and the outer circle of the rotor core to form a magnetic isolation bridge 1. The magnetic isolation bridge 1 has uniform thickness at all places, which reduces the leakage of auxiliary permanent magnets, improves the utilization rate of permanent magnets, and improves the magnetic flux of the motor. A distance is left between the inner side of the auxiliary permanent magnet slot and the main permanent magnet slot to form a magnetic isolation bridge 2. The magnetic isolation bridge 2 has uniform thickness at all places, which reduces the leakage of auxiliary permanent magnets, improves the utilization rate of permanent magnets, and improves the magnetic flux of the motor. At the same time, the auxiliary permanent magnets are designed to be regular shapes to reduce process difficulty, reduce process costs, and improve the cost performance of the motor.

[0093] The auxiliary permanent magnet is in an arc shape and is bent toward the center line of the magnetic pole. There is a distance between the two auxiliary permanent magnets on the same magnetic pole. The angle occupied by this distance is set to K. The center line angle of two adjacent main permanent magnets is set to J. K and J should satisfy the following relationship: 0.3≥K / J≥0.1. Since the processing cost of flat permanent magnets is high, changing to arc-shaped permanent magnets can reduce the processing cost of permanent magnets, reduce motor costs, and improve motor cost performance.

[0094] The auxiliary permanent magnet is in an arc shape and is bent toward the center line of the main permanent magnet. A distance is left between the two auxiliary permanent magnets on the same pole. The angle occupied by this distance is set to M. The center line angle of two adjacent main permanent magnets is set to J. M and J should satisfy the following relationship: 0.3≥M / J≥0.1. Since the processing cost of flat permanent magnets is high, changing to arc-shaped permanent magnets can reduce the processing cost of permanent magnets, reduce motor costs, and improve motor cost performance.

[0095] The auxiliary permanent magnet slot is arc-shaped, and the auxiliary permanent magnet slot is bent toward the center line of the main permanent magnet. A magnetic isolation bridge is left between the auxiliary permanent magnet slot and the outer circle of the rotor core. The thickness of the magnetic isolation bridge is uniform at all places. The auxiliary permanent magnet is placed in the auxiliary permanent magnet slot. The angle between the side of the auxiliary permanent magnet and the arc surface is close to 90 degrees, and the two side edges are parallel, which reduces the sharp angle of the magnet, improves the stiffness of the magnet, prevents the corners of the magnet from breaking during the operation of the motor, reduces the motor performance, and improves the reliability of the motor.

[0096] The inner side of the auxiliary permanent magnet slot is connected to the main permanent magnet slot, and there is no magnetic isolation bridge between the inner side of the auxiliary permanent magnet and the main permanent magnet slot. The magnetic leakage of the auxiliary permanent magnet on the inner side is reduced, thereby increasing the magnetic flux linkage of the motor, and further guiding the demagnetization magnetic field to the outside of the rotor, so that the demagnetization area of ​​the inner side of the permanent magnet is further reduced, thereby improving the anti-demagnetization ability of the main permanent magnet, and then improving the demagnetization ability of the motor.

[0097] The main permanent magnet is a tangential permanent magnet, and an auxiliary permanent magnet is arranged on the rotor magnetic pole formed between adjacent main permanent magnets. One side of the auxiliary permanent magnet is close to the main permanent magnet, and the other side is close to the center line of the rotor magnetic pole. The magnetic pole direction of the auxiliary permanent magnet toward the outside of the rotor is the same as the direction of the rotor magnetic pole. The side of the permanent magnet close to the shaft hole of the rotor iron core is the inner side of the permanent magnet, and the side of the permanent magnet close to the outer circle of the rotor iron core is the outer side of the permanent magnet. By arranging the auxiliary permanent magnet outside the main permanent magnet, and the auxiliary permanent magnet has the same magnetic pole direction as the rotor magnetic pole, the magnetic circuit direction of the demagnetization magnetic field can be changed. The auxiliary permanent magnet guides the demagnetization magnetic field to the outside of the rotor, reducing the size of the demagnetization magnetic field borne by the main permanent magnet, thereby increasing the working point of the tangential main permanent magnet, reducing the demagnetization area of ​​the outer and inner sides of the tangential permanent magnet, and improving the anti-demagnetization ability of the motor. The auxiliary permanent magnet does not bear the demagnetization magnetic field, and the auxiliary permanent magnet is not easy to demagnetize.

[0098] The auxiliary permanent magnet is located outside the main permanent magnet, and the auxiliary permanent magnet is located outside the rotor. The distance between the inner side of the auxiliary permanent magnet and the outer side of the main permanent magnet is set to D1, and the length of the main permanent magnet is set to C. D1 and C should satisfy the following relationship: D1 / C≤0.4. The addition of auxiliary permanent magnets can guide the demagnetization magnetic field to the outer side of the rotor. The closer the auxiliary permanent magnet is to the outer side of the rotor, the less the demagnetization magnetic field is transmitted to the inner side of the rotor, and the smaller the demagnetization magnetic field borne by the main permanent magnet is. The inner demagnetization area of ​​the main permanent magnet is reduced, and the demagnetization area of ​​the outer side of the main permanent magnet is also reduced. When D1 / C>0.4, although the demagnetization area of ​​the inner side of the main permanent magnet is reduced, the demagnetization area of ​​the outer side of the main permanent magnet is increased, and the motor's anti-demagnetization ability is not improved.

[0099] The auxiliary permanent magnet extends along the circumference of the rotor, and has a length along the circumference of the rotor. The angle occupied by this length is set to C, and the angle occupied by the rotor pole is B. C and B should satisfy the following relationship 0.3≥C / B≥0.1.

[0100] The longer the auxiliary permanent magnets extend along the circumferential direction of the rotor, the more the auxiliary permanent magnets guide the demagnetizing magnetic field to the outside of the rotor, so C / B ≥ 0.1. However, if the auxiliary permanent magnets are too long, the magnetic channels between the auxiliary permanent magnets will become shorter, and the magnetic channels will be more easily saturated. The magnetic flux transmitted by the main permanent magnets to the air gap will be reduced, reducing the utilization rate of the main permanent magnets, so 0.3 ≥ C / B.

[0101] There is a distance between the auxiliary permanent magnet and the main permanent magnet, that is, there is an intermediate bridge connected to the rotor core between the auxiliary permanent magnet and the main permanent magnet. The width of the intermediate bridge is set to F, and the air gap length between the stator and the rotor of the motor is set to δ. The ratio of F1 / δ should satisfy the following relationship: 2≥F1 / δ≥1. In order to prevent the main permanent magnet from flying out during high-speed operation, a protective wall is set on the outside of the main permanent magnet, and an intermediate bridge is set between the auxiliary permanent magnet and the main permanent magnet. This can reduce the centrifugal force of the magnetic steel acting on the protective wall during high-speed rotation, improve the structural strength of the rotor, and improve the reliability of the motor. Therefore, F1 / δ≥1. However, when the width of this intermediate bridge is too wide, the demagnetization magnetic field will act on the main permanent magnet from this intermediate bridge, thereby increasing the demagnetization area of ​​the main permanent magnet, deteriorating the anti-demagnetization ability of the main permanent magnet, and reducing the anti-demagnetization ability of the motor. Therefore, 2≥F1 / δ.

[0102] The auxiliary permanent magnet has a certain thickness in the radial direction of the rotor, and the thickness of the auxiliary permanent magnet is less than that of the main permanent magnet. The thickness of the auxiliary permanent magnet is set to H, and the thickness of the main permanent magnet is set to O. The ratio of H1 / O should satisfy the following relationship: 0.4≥H1 / O≥0.05. The thicker the thickness of the auxiliary permanent magnet, the stronger the magnetism of the auxiliary permanent magnet, and the stronger the ability to guide the direction of the demagnetization magnetic field, so H1 / O≥0.05. However, after the auxiliary permanent magnet reaches a certain thickness, the ability to guide the demagnetization magnetic field does not increase substantially. Increasing the thickness of the auxiliary permanent magnet will increase the amount of permanent magnets used, increase the cost of permanent magnets, increase the cost of motors, and reduce the cost performance of motors.

[0103] An air slot is provided on the side of the auxiliary permanent magnet close to the center line of the magnetic pole, and a magnetic isolation bridge is formed between the air slot and the outer circle of the rotor core. The thickness of the magnetic isolation bridge is set to G, and the air gap length between the stator and the rotor of the motor is set to δ. The ratio of G / δ should satisfy the following relationship: 1.8≥G / δ≥0.8. An air slot is provided on the side of the auxiliary permanent magnet close to the center line of the magnetic pole, and a magnetic isolation bridge is formed between the air slot and the outer circle of the rotor core. The magnetic isolation part at the end of the auxiliary permanent magnet can be extended, the end magnetic leakage of the auxiliary permanent magnet can be reduced, the magnetic flux of the demagnetization magnetic field guided by the auxiliary permanent magnet to the outer side of the rotor can be increased, the magnetic circuit can be changed, the working point of the main permanent magnet can be increased, the demagnetization area inside and outside the main permanent magnet can be reduced, and the anti-demagnetization ability of the motor can be improved.

[0104] The auxiliary permanent magnet slot is connected to the main permanent magnet slot. The intermediate bridge left between the auxiliary permanent magnet and the main permanent magnet slot allows a small part of the demagnetization magnetic field to pass through and act on the main permanent magnet, connecting the two permanent magnet slots and reducing the demagnetization magnetic field borne by the main permanent magnet. The optimal position is on the side of the auxiliary permanent magnet close to the main permanent magnet, which can maximize the role of the auxiliary permanent magnet in the demagnetization magnetic circuit.

[0105] The circumferential lengths of the auxiliary permanent magnets on the rotor poles are not equal. The circumferential lengths of the auxiliary permanent magnets on the left and right sides of the main permanent magnet are not equal, and the length of the shorter auxiliary permanent magnet is more than half of the length of the longer auxiliary permanent magnet. Setting permanent magnets with unequal lengths can, on the one hand, improve the demagnetization ability of the motor, and on the other hand, reduce the usage amount of the auxiliary permanent magnets, lower the cost of the permanent magnets, and improve the cost performance of the motor.

[0106] The circumferential lengths of the auxiliary permanent magnets on the rotor poles are not equal. The circumferential lengths of the auxiliary permanent magnets on the left and right sides of the main permanent magnet are equal, and the auxiliary permanent magnets on the left and right sides of the main permanent magnet are symmetric about the center line of the main permanent magnet. The length of the shorter auxiliary permanent magnet is more than half of the length of the longer auxiliary permanent magnet. The equal circumferential lengths of the auxiliary permanent magnets on the left and right sides of the main permanent magnet can, on the one hand, improve the demagnetization ability of the motor, on the other hand, reduce the usage amount of the auxiliary permanent magnets, lower the cost of the permanent magnets, and at the same time make the motor poles more symmetric, reduce the torque ripple of the motor, improve the running stability of the motor, and further improve the cost performance of the motor.

[0107] The coercivity of the auxiliary permanent magnet is higher than that of the main permanent magnet, and the remanence of the auxiliary permanent magnet is higher than that of the main permanent magnet. For example, if the material of the main permanent magnet is ferrite, the material of the auxiliary permanent magnet is neodymium iron boron. Since the magnetic force of neodymium iron boron is stronger than that of ferrite, the main permanent magnet uses a ferrite material with low magnetic properties, and the permanent magnet that plays a role in guiding the demagnetization magnetic field, that is, the auxiliary permanent magnet, uses a neodymium iron boron material with high magnetic properties. By not using neodymium iron boron materials simultaneously, the utilization rate of the permanent magnets can be improved, and the cost of the motor can be reduced.

[0108] As Fig.10 shown, a protective wall structure T is formed outside the main permanent magnet and the auxiliary permanent magnet. Fig.11 At Y in it is the connection point. Fig.12 、 Fig.13 In it, M is the length of one of the auxiliary permanent magnets, and N is the length of the auxiliary permanent magnet adjacent to and on the same pole as this auxiliary permanent magnet. The length of M is more than half of the length of N. Figure 8 In it, 50 is the stator.

[0109] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0110] In addition to the above, it should be noted that "one embodiment", "another embodiment", "embodiment", etc. mentioned in this specification refer to the specific features, structures or characteristics described in conjunction with the embodiment included in at least one embodiment generally described in this application. The same expression appearing in multiple places in the specification does not necessarily refer to the same embodiment. Further, when describing a specific feature, structure or characteristic in conjunction with any embodiment, it is claimed that the realization of such feature, structure or characteristic in conjunction with other embodiments also falls within the scope of the present invention.

[0111] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0112] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotor structure, It is characterized in that include: A rotor body (10), wherein a plurality of main permanent magnet slots are provided on the rotor body (10), auxiliary permanent magnet slots are provided at two sides of each of the main permanent magnet slots extending in the radial direction of the rotor body (10), a main permanent magnet (20) is provided in each of the main permanent magnet slots, and an auxiliary permanent magnet (30) is provided in each of the auxiliary permanent magnet slots; Wherein, the distance between the auxiliary permanent magnet slots located on both sides of the same main permanent magnet slot is arranged to gradually increase outwards along the radial direction of the rotor body (10); The center angle corresponding to the line connecting the ends of the auxiliary permanent magnets (30) on the same magnetic pole close to the outer edge of the rotor body (10) is I, and the center angle formed between the geometric center lines of two adjacent main permanent magnets (20) is J, wherein 0.08≤I / J≤0.

3.

2. The rotor structure according to claim 1, It is characterized in that The first end of the main permanent magnet slot is arranged close to the axial hole (11) of the rotor body (10), the second end of the main permanent magnet slot is arranged away from the axial hole (11) along the radial direction of the rotor body (10), the first end of the auxiliary permanent magnet slot is arranged close to the axial hole (11), the second end of the auxiliary permanent magnet slot is arranged away from the axial hole (11), and the plane where the end surface of the second end of the main permanent magnet slot lies intersects with the auxiliary permanent magnet slot.

3. The rotor structure according to claim 1, It is characterized in that The auxiliary permanent magnet (30) has the same polarity as the side opposite to the main permanent magnet (20).

4. The rotor structure according to claim 1, It is characterized in that The auxiliary permanent magnet (30) is in the shape of an elongated strip, and the angle formed between the geometric center line of the long side direction of the auxiliary permanent magnet (30) and the geometric center line of the main permanent magnet slot is A, wherein 70°≥A≥20°.

5. The rotor structure according to claim 1, It is characterized in that The maximum distance between the end of the auxiliary permanent magnet (30) close to the shaft hole (11) and the outer edge of the main permanent magnet (20) close to the rotor body (10) is B, and the length of the main permanent magnet (20) along the radial direction of the rotor body (10) is C, wherein 0.18≥B / C.

6. The rotor structure according to claim 1, It is characterized in that The minimum distance between the end of the auxiliary permanent magnet (30) on the side close to the outer edge of the rotor body (10) and the outer edge of the rotor body (10) is F, wherein 1.5≥F / δ≥1, and δ is the air gap length between the stator and the rotor body (10).

7. The rotor structure according to claim 1, It is characterized in that The thickness of the auxiliary permanent magnet (30) is D, and the thickness of the main permanent magnet (20) is O, wherein 0.4≥D / O≥0.

05.

8. The rotor structure according to claim 1, It is characterized in that The coercive force of the auxiliary permanent magnet (30) is higher than the coercive force of the main permanent magnet (20).

9. The rotor structure according to claim 1, It is characterized in that An end of the auxiliary permanent magnet slot on a side away from the shaft hole (11) is arranged at a distance from the outer edge of the rotor body (10) to form a first magnetic isolation bridge (12), and the thickness of the first magnetic isolation bridge (12) along the radial direction of the rotor body (10) is uniformly arranged.

10. The rotor structure according to claim 1 or 9, It is characterized in that The end of the auxiliary permanent magnet slot on the side close to the shaft hole (11) is arranged at a distance from the main permanent magnet slot to form a second magnetic isolation bridge (13), and the thickness of the second magnetic isolation bridge (13) along the radial direction of the rotor body (10) is uniformly arranged.

11. The rotor structure according to claim 1, It is characterized in that The auxiliary permanent magnet (30) is an arc-shaped structure, and the auxiliary permanent magnet (30) is arranged in a curved manner toward the magnetic pole center line of the rotor core, or the auxiliary permanent magnet (30) is arranged in a curved manner away from the magnetic pole center line of the rotor core.

12. The rotor structure according to claim 11, It is characterized in that The center angle corresponding to the shortest distance between the ends of the auxiliary permanent magnets (30) on the same magnetic pole close to the outer edge of the rotor body (10) is K, and the center angle formed between the geometric center lines of two adjacent main permanent magnets (20) is J, wherein 0.3≥K / J≥0.

1.

13. The rotor structure according to claim 11, It is characterized in that The arc of the auxiliary permanent magnet (30) is L1, wherein 85°≤L1≤90°.

14. The rotor structure according to claim 1, It is characterized in that One end of the auxiliary permanent magnet slot close to the shaft hole (11) is connected to the main permanent magnet slot, and one end of the auxiliary permanent magnet slot close to the outer edge of the rotor body (10) is arranged at a distance from the main permanent magnet slot.

15. The rotor structure according to claim 11, It is characterized in that The maximum distance between the end of the auxiliary permanent magnet (30) close to the shaft hole (11) and the outer edge of the main permanent magnet (20) close to the rotor body (10) is D1, and the length of the main permanent magnet (20) along the radial direction of the rotor body (10) is C, wherein D1 / C≤0.

4.

16. The rotor structure according to claim 1, It is characterized in that The long side of the auxiliary permanent magnet (30) is arranged to extend along the circumferential direction of the rotor body (10), the central angle formed by the line connecting the two ends of the auxiliary permanent magnet (30) and the shaft hole (11) is C1, and the angle of the magnetic pole of the rotor body (10) is B1, wherein 0.3≥C1 / B1≥0.

1.

17. The rotor structure according to claim 16, It is characterized in that One end of the auxiliary permanent magnet slot facing the main permanent magnet slot is arranged at a distance from the main permanent magnet slot to form a third magnetic isolation bridge (14), the width of the third magnetic isolation bridge (14) is F1, δ is the length of the air gap between the stator and the rotor body (10), wherein 2≥F1 / δ≥1.

18. The rotor structure according to claim 16, It is characterized in that The thickness of the auxiliary permanent magnet (30) along the radial direction of the rotor body (10) is H1, and the thickness of the main permanent magnet (20) is O, wherein 0.4≥H1 / O≥0.

05.

19. The rotor structure according to claim 16, It is characterized in that An air slot (40) is formed between one end of the auxiliary permanent magnet (30) facing the magnetic pole centerline and the auxiliary permanent magnet slot, and a fourth magnetic isolation bridge (15) is formed between the air slot (40) and the outer edge of the rotor body (10), the thickness of the fourth magnetic isolation bridge (15) is G, δ is the air gap length between the stator and the rotor body (10), wherein 1.8≥G / δ≥0.

8.

20. The rotor structure according to claim 16, It is characterized in that The auxiliary permanent magnet slots are communicated with the main permanent magnet slots.

21. The rotor structure according to claim 16, It is characterized in that The auxiliary permanent magnets (30) located on both sides of the main permanent magnet (20) have different lengths.

22. The rotor structure according to claim 1 or 21, It is characterized in that The auxiliary permanent magnets (30) located on both sides of the same magnetic pole center line are arranged symmetrically with respect to the magnetic pole center line.

23. The rotor structure according to claim 16, It is characterized in that The auxiliary permanent magnets (30) located on both sides of the same magnetic pole center line have different lengths.

24. The rotor structure according to claim 1, It is characterized in that The direction of the magnetic poles of the outer edge of the auxiliary permanent magnet (30) facing the rotor body (10) is the same as the direction of the magnetic poles of the rotor body (10).

25. The rotor structure according to claim 1, It is characterized in that The magnetization direction of the main permanent magnet (20) is along the circumferential direction of the rotor body (10), and the magnetization direction of the auxiliary permanent magnet (30) is along the radial direction of the rotor body (10).

26. An electric machine, comprising a rotor structure, It is characterized in that The rotor structure is the rotor structure according to any one of claims 1 to 25.

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