CN108683278A - Rotor structure, permanent magnet auxiliary synchronous reluctance motor and electric automobile - Google Patents

Abstract

The invention provides a rotor structure, a permanent magnet assisted synchronous reluctance motor and an electric vehicle. The rotor structure includes a rotor body, the rotor body is provided with permanent magnet slot groups, there are multiple permanent magnet slot groups, and the plurality of permanent magnet slot groups are arranged at intervals along the circumference of the rotor body, and the plurality of permanent magnet slot groups include a first permanent magnet slot group. The magnet slot group, the first permanent magnet slot group includes a plurality of permanent magnet slots arranged in sequence outward along the radial direction of the rotor body, and a part of the slot section of at least one permanent magnet slot in the plurality of permanent magnet slots is along the radial direction of the rotor body The cross-section is S-shaped. Adopting the rotor structure of the scheme effectively improves the magnetic flux generated by the permanent magnets of the rotor structure, increases the electromagnetic torque per unit current of the motor with the rotor structure, and increases the efficiency of the motor.

Description

Rotor structure, permanent magnet assisted synchronous reluctance motor and electric vehicle

technical field

The invention relates to the technical field of motor equipment, in particular to a rotor structure, a permanent magnet assisted synchronous reluctance motor and an electric vehicle.

Background technique

Electric vehicles have the characteristics of energy saving and environmental protection, and have been developed rapidly. In order to achieve the functions of high power density and high efficiency of the existing electric vehicle drive motors, more and more motors use high-performance rare earth permanent magnet motors. Rare-earth permanent magnet motors can achieve high efficiency and high power density, mainly relying on high-performance rare-earth permanent magnets. Currently, NdFeB rare-earth permanent magnets are the most widely used. However, rare earth is a non-renewable resource, the price is relatively expensive, and the price of rare earth fluctuates greatly, resulting in higher production costs of electric vehicle drive motors, which is very unfavorable for promoting the overall development of electric vehicles. Further, in the prior art, a ferrite permanent magnet assisted synchronous reluctance motor is applied to an electric vehicle, but this kind of motor has problems such as high noise, easy demagnetization, and low efficiency.

Contents of the invention

The main purpose of the present invention is to provide a rotor structure, a permanent magnet assisted synchronous reluctance motor and an electric vehicle, so as to solve the problem of low motor efficiency in the prior art.

In order to achieve the above object, according to one aspect of the present invention, a rotor structure is provided, including: a rotor body, a permanent magnet slot set is arranged on the rotor body, there are a plurality of permanent magnet slot sets, and the plurality of permanent magnet slot sets are arranged along the rotor body. The circumferential direction of the main body is arranged at intervals, and the plurality of permanent magnet slot groups include a first permanent magnet slot group, and the first permanent magnet slot group includes a plurality of permanent magnet slots arranged in sequence outward along the radial direction of the rotor body, and the plurality of permanent magnet slot groups A part of the slot section of at least one permanent magnet slot in the magnet slots has an S-shaped cross section along the radial direction of the rotor body.

Further, the plurality of permanent magnet slots include a first inner layer permanent magnet slot, the first inner layer permanent magnet slot includes: a first slot segment, the first end of the first slot segment extends toward the shaft hole of the rotor body, the first slot The second end of the segment extends toward the outer edge of the rotor body and is set at a distance from the outer edge of the rotor body; the second slot segment, the first end of the second slot segment communicates with the first end of the first slot segment, and the second slot segment communicates with the first end of the first slot segment. The second slot section extends along the direction perpendicular to the direct axis of the rotor body; the third slot section, the first end of the third slot section communicates with the second end of the second slot section, and the second end of the third slot section faces the rotor The outer edge of the body extends and is arranged at a distance from the outer edge of the rotor body, and the first slot section and the third slot section are arranged opposite to each other; wherein, the first slot section and/or the third slot section are arranged along the radial direction of the rotor body The cross section is S-shaped.

Further, there are multiple first inner permanent magnet slots, and the plurality of first inner permanent magnet slots are arranged at intervals along the radial direction of the rotor body.

Further, the plurality of permanent magnet slots further include: outer permanent magnet slots, the outer permanent magnet slots are spaced apart from the first inner permanent magnet slots and located outside the first inner permanent magnet slots.

Further, the plurality of permanent magnet slot groups includes a second permanent magnet slot group, the second permanent magnet slot group includes a plurality of permanent magnet slots, the plurality of permanent magnet slots include a second inner layer permanent magnet slot, and the second inner layer permanent magnet The slot includes: a fourth slot section, the first end of the fourth slot section extends toward the shaft hole of the rotor body, and the second end of the fourth slot section extends toward the outer edge of the rotor body and is arranged at a distance from the outer edge of the rotor body , the fourth slot section is set adjacent to the third slot section; the fifth slot section, the first end of the fifth slot section communicates with the first end of the fourth slot section, and the fifth slot section is along a straight axis perpendicular to the rotor body Extending in the direction; the sixth slot section, the first end of the sixth slot section communicates with the second end of the fifth slot section, and the second end of the sixth slot section extends toward the outer edge of the rotor body and connects with the outer edge of the rotor body The edges are arranged with a distance, and the fourth slot section is arranged opposite to the sixth slot section; wherein, the cross section of the fourth slot section and/or the sixth slot section along the radial direction of the rotor body is S-shaped.

Further, the cross-section of the third slot segment along the radial direction of the rotor body is S-shaped, the cross-section of the fourth slot segment along the radial direction of the rotor body is S-shaped, and the third slot segment and the fourth slot segment have an S-shaped cross-section relative to the rotor body. The cross axis is arranged symmetrically.

Further, the rotor structure further includes a connecting hole, and the connecting hole is arranged at a position opposite to the recess of the third slot segment and the fourth slot segment.

Further, each permanent magnet slot is provided with a permanent magnet, and at least part of the permanent magnet has a C-shaped cross section along the radial direction of the rotor body.

Further, the permanent magnet includes an inner layer permanent magnet, and the inner layer permanent magnet includes: a first permanent magnet segment, the first permanent magnet segment is arranged in the second end of the first slot segment, and the first permanent magnet segment is arranged along the radial direction of the rotor body. The cross-section in the radial direction is C-shaped; the second permanent magnet segment is arranged in the first end of the first slot segment, and the cross-section of the second permanent magnet segment in the radial direction of the rotor body is C-shaped , the bending direction of the first permanent magnet segment is opposite to that of the second permanent magnet segment.

Further, the inner layer permanent magnet also includes: a third permanent magnet segment, the third permanent magnet segment is arranged in the second end of the third slot segment and opposite to the first permanent magnet segment, and the third permanent magnet segment is arranged along the rotor The cross-section in the radial direction of the body is C-shaped; the fourth permanent magnet segment, the fourth permanent magnet segment is arranged in the first end of the third slot segment and is opposite to the second permanent magnet segment, the fourth permanent magnet segment The cross section along the radial direction of the rotor body is C-shaped, and the bending direction of the third permanent magnet segment is opposite to that of the fourth permanent magnet segment.

Further, the structure of the first permanent magnet segment is the same as that of the second permanent magnet segment, and/or the structure of the third permanent magnet segment is the same as that of the fourth permanent magnet segment, and/or the structure of the first permanent magnet segment Same structure as the fourth permanent magnet segment.

Further, the permanent magnet includes an inner layer permanent magnet, and the inner layer permanent magnet includes: a first permanent magnet segment, the first permanent magnet segment is arranged in the second end of the first slot segment, and the first permanent magnet segment is arranged along the radial direction of the rotor body. The cross section in the direction is C-shaped; the second permanent magnet segment, the second permanent magnet segment is arranged in the second slot segment, and the first end of the second permanent magnet segment extends into the first end of the first slot segment, The second end of the second permanent magnet segment extends into the first end of the third slot segment, and the cross section of the second permanent magnet segment along the radial direction of the rotor body is C-shaped; the third permanent magnet segment, the third permanent magnet The segment is arranged in the second end of the third slot segment and is arranged opposite to the first permanent magnet segment, and the cross section of the third permanent magnet segment along the radial direction of the rotor body is C-shaped.

Further, the protrusions of the first permanent magnet segment and the third permanent magnet segment are arranged towards the straight axis, and the structures of the first permanent magnet segment and the third permanent magnet segment are the same.

Further, the first permanent magnet segment, the second permanent magnet segment and the third permanent magnet segment are arranged symmetrically about the straight axis.

Further, the plurality of permanent magnet slots include outer permanent magnet slots, the permanent magnets include outer permanent magnets, the outer permanent magnets are arranged in the outer permanent magnet slots, and part of the outer permanent magnets are arranged along the radial direction of the rotor body. The cross-section is C-shaped.

Further, the cross-section of the permanent magnet along the radial direction of the rotor body has a C-shaped structure, and the thickness of the central part is greater than the thickness of both ends of the C-shaped structure.

According to another aspect of the present invention, a permanent magnet assisted synchronous reluctance motor is provided, including a rotor structure, which is the above rotor structure.

According to another aspect of the present invention, an electric vehicle is provided, including a rotor structure, which is the above rotor structure.

Applying the technical scheme of the present invention, adopting the rotor structure of the scheme effectively improves the magnetic flux generated by the permanent magnets of the rotor structure, increases the electromagnetic torque per unit current of the motor with the rotor structure, and increases the efficiency of the motor. And it can effectively prevent the vibration and deviation of the permanent magnet caused by centrifugal force, vibration and other influences during the rotation of the rotor when the motor is working, and then effectively reduce the electromagnetic noise caused by the permanent magnet moving in the slot.

Description of drawings

The accompanying drawings constituting a part of the present application are used to provide a further understanding of the present invention, and the schematic embodiments and descriptions of the present invention are used to explain the present invention, and do not constitute an improper limitation of the present invention. In the attached picture:

Fig. 1 shows a structural schematic diagram of a first embodiment of a rotor structure according to the present invention;

Fig. 2 shows a structural schematic diagram of a second embodiment of the rotor structure according to the present invention;

Fig. 3 shows a schematic structural view of a third embodiment of the rotor structure according to the present invention;

Fig. 4 shows a structural schematic diagram of a fourth embodiment of the rotor structure according to the present invention.

Wherein, the above-mentioned accompanying drawings include the following reference signs:

10. The rotor body; 11. The first slot section; 12. The second slot section; 13. The third slot section; 14. The outer permanent magnet slot; 15. The shaft hole;

20. The second inner permanent magnet slot; 21. The fourth slot section; 22. The fifth slot section; 23. The sixth slot section;

30. Permanent magnet; 31. The first permanent magnet segment; 32. The second permanent magnet segment; 33. The third permanent magnet segment; 34. The fourth permanent magnet segment;

40, connecting hole.

Detailed ways

It should be noted that, in the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and examples.

It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and/or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and/or combinations thereof.

It should be noted that the terms "first" and "second" in the specification, claims and drawings of the present application are used to distinguish similar objects, but not necessarily used to describe a specific order or sequence. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

For the convenience of description, spatially relative terms may be used here, such as "on ...", "over ...", "on the surface of ...", "above", etc., to describe the The spatial positional relationship between one device or feature shown and other devices or features. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, devices described as "above" or "above" other devices or configurations would then be oriented "beneath" or "above" the other devices or configurations. under other devices or configurations”. Thus, the exemplary term "above" can encompass both an orientation of "above" and "beneath". The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptions used herein interpreted accordingly.

Now, exemplary embodiments according to the present application will be described in more detail with reference to the accompanying drawings. These example embodiments may, however, be embodied in many different forms and should not be construed as limited to only the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete and will fully convey the concept of these exemplary embodiments to those of ordinary skill in the art. The thicknesses of layers and regions are indicated, and the same reference numerals are used to designate the same devices, and thus their descriptions will be omitted.

As shown in FIG. 1 to FIG. 4 , according to an embodiment of the present invention, a rotor structure is provided.

Specifically, as shown in FIG. 1 , the rotor structure includes a rotor body 10 . The rotor body 10 is provided with permanent magnet slot groups, the permanent magnet slot groups are multiple, and the plurality of permanent magnet slot groups are arranged at intervals along the circumference of the rotor body 10, and the plurality of permanent magnet slot groups include the first permanent magnet slot group, The first permanent magnet slot group includes a plurality of permanent magnet slots arranged in sequence outward along the radial direction of the rotor body 10, and a part of the slot section of at least one permanent magnet slot in the plurality of permanent magnet slots is along the transverse direction of the rotor body 10 radial direction. The cross section is S-shaped.

In this embodiment, adopting the rotor structure of this solution effectively increases the magnetic flux generated by the permanent magnets of the rotor structure, increases the electromagnetic torque per unit current of the motor with the rotor structure, and increases the efficiency of the motor. And it can effectively prevent the vibration and deviation of the permanent magnet caused by centrifugal force, vibration and other influences during the rotation of the rotor when the motor is working, and then effectively reduce the electromagnetic noise caused by the permanent magnet moving in the slot.

Wherein, the plurality of permanent magnet slots include the first inner layer permanent magnet slots. The first inner permanent magnet slot includes a first slot segment 11 , a second slot segment 12 and a third slot segment 13 . The first end of the first slot section 11 extends toward the shaft hole of the rotor body 10 , and the second end of the first slot section 11 extends toward the outer edge of the rotor body 10 and is set at a distance from the outer edge of the rotor body 10 . The first end of the second slot section 12 communicates with the first end of the first slot section 11 . The second slot segment 12 extends along a direction perpendicular to the direct axis of the rotor body 10 . The first end of the third slot section 13 communicates with the second end of the second slot section 12, and the second end of the third slot section 13 extends toward the outer edge of the rotor body 10 and has a distance from the outer edge of the rotor body 10. It is provided that the first groove segment 11 is opposite to the third groove segment 13 . Wherein, the cross section of the first slot segment 11 and/or the third slot segment 13 along the radial direction of the rotor body 10 is S-shaped. Such arrangement can effectively improve the performance of the rotor structure.

In order to further improve the performance of the rotor structure, a plurality of first inner permanent magnet slots may be provided, and the plurality of first inner permanent magnet slots are arranged at intervals along the radial direction of the rotor body 10 .

The plurality of permanent magnet slots also includes outer layer permanent magnet slots 14 . The outer layer permanent magnet slots 14 are spaced apart from the first inner layer permanent magnet slots and are located outside the first inner layer permanent magnet slots.

Wherein, the plurality of permanent magnet slot groups includes a second permanent magnet slot group. The second permanent magnet slot group includes a plurality of permanent magnet slots, and the plurality of permanent magnet slots include the second inner permanent magnet slot 20 . The second inner permanent magnet slot 20 includes a fourth slot segment 21 , a fifth slot segment 22 and a sixth slot segment 23 . The first end of the fourth slot section 21 extends toward the shaft hole of the rotor body 10 , and the second end of the fourth slot section 21 extends toward the outer edge of the rotor body 10 and is set at a distance from the outer edge of the rotor body 10 . The fourth groove section 21 is arranged adjacent to the third groove section 13 . The first end of the fifth slot section 22 communicates with the first end of the fourth slot section 21 , and the fifth slot section 22 extends along a direction perpendicular to the direct axis of the rotor body 10 . The first end of the sixth slot section 23 communicates with the second end of the fifth slot section 22 , and the second end of the sixth slot section 23 extends toward the outer edge of the rotor body 10 and has a distance from the outer edge of the rotor body 10 . It is provided that the fourth slot segment 21 is disposed opposite to the sixth slot segment 23 ; wherein, the cross section of the fourth slot segment 21 and/or the sixth slot segment 23 along the radial direction of the rotor body 10 is S-shaped.

Preferably, the cross-section of the third slot section 13 along the radial direction of the rotor body 10 is S-shaped, the cross-section of the fourth slot section 21 along the radial direction of the rotor body 10 is S-shaped, and the third slot section 13 and the fourth slot The segments 21 are arranged symmetrically about the quadrature axis of the rotor body 10 .

In order to improve the stability of the rotor structure, the rotor structure also includes connection holes 40 . The connecting hole 40 is arranged at the opposite position of the concave portion of the third groove section 13 and the fourth groove section 21, wherein, as shown in FIG. axis.

As shown in FIG. 2 and FIG. 3 , permanent magnets 30 are arranged in each permanent magnet slot. At least part of the cross section of the permanent magnet 30 along the radial direction of the rotor body 10 is C-shaped. The permanent magnet 30 includes an inner layer permanent magnet. The inner permanent magnet includes a first permanent magnet segment 31 and a second permanent magnet segment 32 . The first permanent magnet segment 31 is disposed in the second end of the first slot segment 11 , and the cross section of the first permanent magnet segment 31 along the radial direction of the rotor body 10 is C-shaped. The second permanent magnet segment 32 is arranged in the first end of the first slot segment 11, the cross section of the second permanent magnet segment 32 along the radial direction of the rotor body 10 is C-shaped, and the bending direction of the first permanent magnet segment 31 is in line with The bending direction of the second permanent magnet segment 32 is opposite.

The inner permanent magnet also includes a third permanent magnet segment 33 and a fourth permanent magnet segment 34 . The third permanent magnet segment 33 is disposed in the second end of the third slot segment 13 and opposite to the first permanent magnet segment 31, and the cross section of the third permanent magnet segment 33 along the radial direction of the rotor body 10 is C-shaped. . The fourth permanent magnet segment 34 is arranged in the first end of the third slot segment 13 and is arranged opposite to the second permanent magnet segment 32, and the cross section of the fourth permanent magnet segment 34 along the radial direction of the rotor body 10 is C-shaped. , the bending direction of the third permanent magnet segment 33 is opposite to the bending direction of the fourth permanent magnet segment 34 .

Wherein, preferably, the structure of the first permanent magnet segment 31 is the same as that of the second permanent magnet segment 32, the structure of the third permanent magnet segment 33 is the same as that of the fourth permanent magnet segment 34, and the structure of the first permanent magnet segment 31 is the same as that of the second permanent magnet segment 32. The structure is the same as that of the fourth permanent magnet segment 34 .

As shown in Figure 4, according to another embodiment of the present application, the permanent magnet 30 includes an inner permanent magnet, and the inner permanent magnet includes a first permanent magnet segment 31, a second permanent magnet segment 32 and a third permanent magnet segment 33 . The first permanent magnet segment 31 is disposed in the second end of the first slot segment 11 . The cross-section of the first permanent magnet segment 31 along the radial direction of the rotor body 10 is C-shaped. The second permanent magnet segment 32 is arranged in the second slot segment 12, and the first end of the second permanent magnet segment 32 extends into the first end of the first slot segment 11, and the second end of the second permanent magnet segment 32 extends Into the first end of the third slot segment 13 , the cross section of the second permanent magnet segment 32 along the radial direction of the rotor body 10 is C-shaped. The third permanent magnet segment 33 is disposed in the second end of the third slot segment 13 and opposite to the first permanent magnet segment 31, and the cross section of the third permanent magnet segment 33 along the radial direction of the rotor body 10 is C-shaped. . Wherein, only the structure of the permanent magnet is shown in FIG. 3 and FIG. 4 , and the structure of the magnetic steel groove is not shown.

As shown in FIG. 4 , the protrusions of the first permanent magnet segment 31 and the third permanent magnet segment 33 are arranged toward the straight axis, and the first permanent magnet segment 31 and the third permanent magnet segment 33 have the same structure. Such arrangement can effectively improve the performance of the rotor structure. Preferably, the first permanent magnet segment 31 , the second permanent magnet segment 32 and the third permanent magnet segment 33 are arranged symmetrically about a straight axis.

A plurality of permanent magnet grooves comprise outer layer permanent magnet grooves 14, permanent magnet 30 includes outer layer permanent magnets, outer layer permanent magnets are arranged in outer layer permanent magnet grooves 14, part of outer layer permanent magnets along the radial direction of rotor body 10 The cross-section of the direction is C-shaped (shown at f3 in Figure 4). Such setting can effectively avoid magnetic flux leakage in the rotor structure.

As shown in FIG. 2 , the cross-section of the permanent magnet 30 along the radial direction of the rotor body 10 is a C-shaped structure, the thickness of the middle part is greater than the thickness of both ends of the C-shaped structure. This setting can further reduce the movement of the permanent magnet in the slot and reduce the electromagnetic noise of the motor.

The rotor structure in the above embodiments can also be used in the technical field of motor equipment, that is, according to another aspect of the present invention, a permanent magnet assisted synchronous reluctance motor (hereinafter referred to as a motor) is provided. The motor includes a rotor structure, which is the rotor structure in the above-mentioned embodiments.

The rotor structure in the above embodiments can also be used in the technical field of electric vehicle equipment, that is, according to another aspect of the present invention, an electric vehicle is provided. The electric vehicle includes a rotor structure. The rotor structure is the rotor structure in the above-mentioned embodiments.

Specifically, the same magnetic pole of the rotor structure contains multiple layers of permanent magnets, the permanent magnets in the same magnetic pole have the same polarity toward the stator, the permanent magnet slots have a shape that protrudes toward the shaft hole 15 side of the rotor, and the rotor structure A section of the permanent magnet slot is roughly S-shaped, and has two convex and concave shapes in the S-shaped. By setting the permanent magnet slots in S shape, under the same cross-sectional area of the rotor, the area where the permanent magnets provide magnetic flux is larger, which increases the flux linkage of the permanent magnets of the motor and improves the efficiency of the motor, and the S shape The permanent magnet groove can effectively prevent the permanent magnet from moving in the groove due to the alternating electromagnetic force, and reduce the electromagnetic noise caused by the movement of the permanent magnet.

Each magnetic pole boundary position of the rotor structure has a gradually enlarged area surrounded by permanent magnets, and rotor punching connection holes are arranged in this area. By forming an enlarged area, the blocking of the rotor magnetic flux by the connection hole of the rotor punching plate can be reduced, the magnetic force line is smoother, and the electromagnetic torque per unit current of the motor is improved.

There are two C-shaped permanent magnets in an S-shaped permanent magnet slot of the rotor structure, and the two C-shaped permanent magnets form an approximately S-shaped permanent magnet, which can effectively reduce the manufacturing cost of the permanent magnet. The thickness of the middle part of all C-shaped permanent magnets can be set to be greater than the thickness of the two ends. It can further reduce the movement of the permanent magnet in the slot and reduce the electromagnetic noise of the motor. In the permanent magnet slots of the same layer of the rotor, the two C-shaped permanent magnets forming the S-shaped permanent magnet have the same shape, which can reduce the number of permanent magnets with different shapes and reduce the manufacturing cost of the permanent magnets.

In the permanent magnet slot of the same layer of the rotor structure, there is a C-shaped permanent magnet in the middle, and two C-shaped permanent magnets with the same shape on both sides. The number of permanent magnets can be reduced, the manufacturing cost of the permanent magnets and the difficulty of assembling the permanent magnets can be reduced.

In this application, the same magnetic pole of the rotor structure contains multiple layers of permanent magnets, which can enable the motor to obtain a larger reluctance torque and have a stronger anti-demagnetization capability. The permanent magnets in the same magnetic pole have the same polarity toward the stator. The permanent magnet slot has a shape that protrudes toward the inner side of the rotor. A section of the rotor permanent magnet slot is roughly S-shaped, and there are two protrusions and recesses in the S-shape shape. By setting the permanent magnet slot into an S shape, under the same cross-sectional area of the rotor, the permanent magnet can provide a larger area of flux, which increases the flux linkage of the permanent magnet of the motor. When using ferrite with low remanence When the permanent magnet is used, it can also make the rotor generate a larger air gap flux, which improves the output torque of the motor per unit current, reduces the winding loss of the motor, and improves the efficiency of the motor, and the S-shaped permanent magnet slot can effectively The permanent magnet is prevented from moving in the groove due to the alternating electromagnetic force, and the electromagnetic noise caused by the movement of the permanent magnet is reduced.

Wherein, the position of each magnetic pole boundary of the rotor has a gradually enlarged area surrounded by the inner permanent magnet slots of two adjacent magnetic poles, and a rotor punching connection hole is arranged in this area. By forming an enlarged area, the blocking of the rotor magnetic flux by the connection hole of the rotor punching plate can be reduced, the magnetic force line is smoother, and the electromagnetic torque per unit current of the motor is improved.

As shown in Figure 4, the surface area of the middle C-shaped permanent magnet is larger than that of the C-shaped permanent magnets on both sides. Under the same rotor, the total surface area of the single-layer permanent magnet can be increased, and the magnetic flux output of the permanent magnet can be increased. the efficiency of the motor.

In addition to the above, it also needs to be explained that "one embodiment", "another embodiment", "embodiment" and the like mentioned in this specification refer to specific features, structures or Features are included in at least one embodiment generally described in this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure or characteristic is described in combination with any embodiment, it is claimed that implementing such feature, structure or characteristic in combination with other embodiments also falls within the scope of the present invention.

In the foregoing embodiments, the descriptions of each embodiment have their own emphases, and for parts not described in detail in a certain embodiment, reference may be made to relevant descriptions of other embodiments.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims (18)

1. A rotor structure, characterized in that, comprising: A rotor body (10), the rotor body (10) is provided with permanent magnet slot groups, the permanent magnet slot groups are multiple, and the plurality of permanent magnet slot groups are along the circumferential direction of the rotor body (10) Arranged at intervals, the plurality of permanent magnet slot groups include a first permanent magnet slot group, and the first permanent magnet slot group includes a plurality of permanent magnets arranged in sequence outward along the radial direction of the rotor body (10) Slots, at least one of the permanent magnet slots in the plurality of permanent magnet slots has an S-shaped cross section along the radial direction of the rotor body (10). 2. The rotor structure according to claim 1, wherein the plurality of permanent magnet slots include first inner permanent magnet slots, and the first inner permanent magnet slots include: A first slot segment (11), the first end of the first slot segment (11) extends toward the shaft hole of the rotor body (10), and the second end of the first slot segment (11) faces toward the The outer edge of the rotor body (10) extends and is arranged with a distance from the outer edge of the rotor body (10); The second slot section (12), the first end of the second slot section (12) communicates with the first end of the first slot section (11), and the second slot section (12) is perpendicular to The rotor body (10) is extended in the direction of the direct axis; The third slot section (13), the first end of the third slot section (13) communicates with the second end of the second slot section (12), the second slot section of the third slot section (13) The end extends towards the outer edge of the rotor body (10) and is arranged at a distance from the outer edge of the rotor body (10), the first slot segment (11) is opposite to the third slot segment (13) setting; Wherein, the cross-section of the first slot segment (11) and/or the third slot segment (13) along the radial direction of the rotor body (10) is S-shaped. 3. The rotor structure according to claim 2, characterized in that there are multiple first inner permanent magnet slots, and the plurality of first inner permanent magnet slots are along the diameter of the rotor body (10). set at intervals in the direction. 4. The rotor structure according to claim 2 or 3, wherein the plurality of permanent magnet slots further comprise: Outer layer permanent magnet slots (14), the outer layer permanent magnet slots (14) are spaced apart from the first inner layer permanent magnet slots and located outside the first inner layer permanent magnet slots. 5. The rotor structure according to claim 2 or 3, wherein the plurality of permanent magnet slot groups includes a second permanent magnet slot group, and the second permanent magnet slot group includes a plurality of permanent magnet slots, more The permanent magnet slots include a second inner layer permanent magnet slot (20), and the second inner layer permanent magnet slot (20) includes: A fourth slot segment (21), the first end of the fourth slot segment (21) extends toward the shaft hole of the rotor body (10), and the second end of the fourth slot segment (21) faces toward the The outer edge of the rotor body (10) extends and is arranged at a distance from the outer edge of the rotor body (10), and the fourth slot section (21) is arranged adjacent to the third slot section (13); The fifth slot section (22), the first end of the fifth slot section (22) communicates with the first end of the fourth slot section (21), and the fifth slot section (22) is perpendicular to The rotor body (10) is extended in the direction of the direct axis; A sixth slot section (23), the first end of the sixth slot section (23) communicates with the second end of the fifth slot section (22), and the second end of the sixth slot section (23) The end extends toward the outer edge of the rotor body (10) and is arranged at a distance from the outer edge of the rotor body (10), the fourth slot segment (21) is opposite to the sixth slot segment (23) setting; Wherein, the cross section of the fourth slot section (21) and/or the sixth slot section (23) along the radial direction of the rotor body (10) is S-shaped. 6. The rotor structure according to claim 5, characterized in that, the cross-section of the third slot section (13) along the radial direction of the rotor body (10) is S-shaped, and the fourth slot section ( 21) The cross section along the radial direction of the rotor body (10) is S-shaped, and the third slot segment (13) and the fourth slot segment (21) are about the orthogonal axis of the rotor body (10) Set symmetrically. 7. The rotor structure according to claim 6, characterized in that, the rotor structure further comprises a connecting hole (40), and the connecting hole (40) is arranged in the third slot segment (13) and the first slot segment (13) At the position opposite to the recess of the four-slot section (21). 8. The rotor structure according to claim 2 or 3, characterized in that, permanent magnets (30) are arranged in each of the permanent magnet slots, and the permanent magnets (30) are arranged along the diameter of the rotor body (10). At least part of the cross-section in the direction is C-shaped. 9. The rotor structure according to claim 8, characterized in that, the permanent magnet (30) comprises an inner permanent magnet, and the inner permanent magnet comprises: The first permanent magnet segment (31), the first permanent magnet segment (31) is arranged in the second end of the first slot segment (11), and the first permanent magnet segment (31) is arranged along the rotor The cross-section in the radial direction of the body (10) is C-shaped; The second permanent magnet segment (32), the second permanent magnet segment (32) is arranged in the first end of the first slot segment (11), and the second permanent magnet segment (32) is arranged along the rotor The cross-section in the radial direction of the body (10) is C-shaped, and the bending direction of the first permanent magnet segment (31) is opposite to that of the second permanent magnet segment (32). 10. The rotor structure according to claim 9, wherein the inner permanent magnet further comprises: The third permanent magnet segment (33), the third permanent magnet segment (33) is arranged in the second end of the third groove segment (13) and is arranged opposite to the first permanent magnet segment (31) , the cross-section of the third permanent magnet segment (33) along the radial direction of the rotor body (10) is C-shaped; A fourth permanent magnet segment (34), the fourth permanent magnet segment (34) is arranged in the first end of the third slot segment (13) and is arranged opposite to the second permanent magnet segment (32) , the cross-section of the fourth permanent magnet segment (34) along the radial direction of the rotor body (10) is C-shaped, and the bending direction of the third permanent magnet segment (33) is the same as that of the fourth permanent magnet Segments (34) are bent in opposite directions. 11. The rotor structure according to claim 10, characterized in that, The structure of the first permanent magnet segment (31) is the same as that of the second permanent magnet segment (32), and/or The structure of the third permanent magnet segment (33) is the same as that of the fourth permanent magnet segment (34), and/or The structure of the first permanent magnet segment (31) is the same as that of the fourth permanent magnet segment (34). 12. The rotor structure according to claim 8, characterized in that, the permanent magnet (30) comprises an inner permanent magnet, and the inner permanent magnet comprises: The first permanent magnet segment (31), the first permanent magnet segment (31) is arranged in the second end of the first slot segment (11), and the first permanent magnet segment (31) is arranged along the rotor The cross-section in the radial direction of the body (10) is C-shaped; The second permanent magnet segment (32), the second permanent magnet segment (32) is arranged in the second groove segment (12), and the first end of the second permanent magnet segment (32) extends to the In the first end of the first slot section (11), the second end of the second permanent magnet section (32) extends into the first end of the third slot section (13), and the second permanent magnet section (32) extends into the first end of the third slot section (13). The cross-section of the magnet segment (32) along the radial direction of the rotor body (10) is C-shaped; The third permanent magnet segment (33), the third permanent magnet segment (33) is arranged in the second end of the third groove segment (13) and is arranged opposite to the first permanent magnet segment (31) , the cross-section of the third permanent magnet segment (33) along the radial direction of the rotor body (10) is C-shaped. 13. The rotor structure according to claim 12, characterized in that, the protrusions of the first permanent magnet segment (31) and the third permanent magnet segment (33) are arranged towards the straight axis, the The first permanent magnet segment (31) and the third permanent magnet segment (33) have the same structure. 14. The rotor structure according to claim 12, characterized in that, the first permanent magnet segment (31), the second permanent magnet segment (32) and the third permanent magnet segment (33) are relative to the The above-mentioned direct axis is arranged symmetrically. 15. The rotor structure according to claim 8, characterized in that, a plurality of said permanent magnet slots comprise outer layer permanent magnet slots (14), said permanent magnets (30) include outer layer permanent magnets, said outer layer The permanent magnets are arranged in the outer permanent magnet slots (14), and part of the outer permanent magnets have a C-shaped cross section along the radial direction of the rotor body (10). 16. The rotor structure according to claim 8, characterized in that, the cross-section of the permanent magnet (30) along the radial direction of the rotor body (10) is in a C-shaped structure, and the thickness of the middle part is greater than that of the C-shaped structure thickness at both ends. 17. A permanent magnet assisted synchronous reluctance motor, comprising a rotor structure, characterized in that the rotor structure is the rotor structure described in any one of claims 1-16. 18. An electric vehicle, comprising a rotor structure, characterized in that the rotor structure is the rotor structure according to any one of claims 1-16.