CN116526716A - Permanent magnet of rotor, driving motor and vehicle - Google Patents

Abstract

The invention discloses a permanent magnet of a rotor, the rotor, a driving motor and a vehicle, wherein the permanent magnet comprises: a plurality of first portions; at least one vortex weakening groove; a second portion for connecting two adjacent first portions separated by any one of the vortex reduction grooves. According to the permanent magnet of the rotor, the eddy current weakening grooves, the first parts and the second parts connecting the two first parts are arranged, so that eddy current loss and rotor temperature rise of the rotor are reduced, high-speed power of the rotor is improved, power density is improved, service life of a motor is prolonged, and the permanent magnet of the rotor has the advantages of being high in integrity, low in cost and the like.

Description

Permanent magnet of rotor, driving motor and vehicle

Technical Field

The invention relates to the technical field of vehicles, in particular to a permanent magnet of a rotor, the rotor, a driving motor and a vehicle.

Background

The motor is used as a core component of the electric automobile driving system, the performance of the motor is directly determined by the performance of the motor, the rotor structure is one of the motor core structures, and the motor performance and the service life are directly determined by the advantages and disadvantages of the rotor structure.

However, in the related art, the motor rotor has the problems of large eddy current loss, temperature rise and the like, which becomes a bottleneck for the development of the high-speed permanent magnet motor to a larger function and a higher rotating speed.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, an object of the present invention is to propose a permanent magnet of a rotor which is able to reduce the eddy current loss of the rotor and to reduce the temperature rise.

The invention also provides a rotor with the permanent magnet.

The invention also provides a driving motor with the rotor.

The invention further provides a vehicle with the driving motor.

A permanent magnet of a rotor according to an embodiment of the present invention includes: a plurality of first portions; at least one vortex weakening groove; a second portion for connecting two adjacent first portions separated by any one of the vortex reduction grooves.

According to the permanent magnet of the rotor, the eddy current weakening grooves, the first parts and the second parts connecting the two first parts are arranged, so that eddy current loss and rotor temperature rise of the rotor are reduced, high-speed power of the rotor is improved, power density is improved, service life of a motor is prolonged, and the permanent magnet of the rotor has the advantages of being high in integrity, low in cost and the like.

In addition, the permanent magnet of the rotor according to the above embodiment of the present invention may have the following additional technical features:

according to some embodiments of the invention, the distance between two adjacent first portions separated by the vortex reduction groove is between 0.1mm and 0.15mm.

According to some embodiments of the invention, the plurality of first portions are equally spaced apart, and the plurality of first portions have equal thickness in the separation direction.

According to some embodiments of the invention, the number of first portions is 3-6.

According to some embodiments of the invention, the plurality of first portions are arranged along a first direction, and the second portions are connected to end portions or middle portions of the first portions along a second direction, the first direction being perpendicular to the second direction.

According to some embodiments of the invention, in the second direction, the permanent magnet has an extension of L and the eddy current weakening slot has an extension of S, wherein 0.7 l.ltoreq.s.ltoreq.0.8L.

According to some embodiments of the invention, the permanent magnet has a length direction, a width direction, and a thickness direction, wherein the first direction is the length direction and the second direction is the width direction of the permanent magnet; alternatively, the first direction is the width direction, and the second direction is the length direction of the permanent magnet.

The rotor according to the embodiment of the invention comprises a rotor core and a permanent magnet of the rotor according to the embodiment of the invention, wherein the permanent magnet is mounted on the rotor core.

According to some embodiments of the invention, the rotor further comprises: and the wrapping piece wraps the outer peripheral surface of the rotor core.

According to some embodiments of the invention, the wrapping member is a carbon fiber composite material and is wound outside the rotor core by impregnating resin, and the winding tension of the wrapping member is greater than 600N.

According to some embodiments of the invention, the rotor core is provided with a mounting groove for mounting the permanent magnet, a magnetic isolation bridge is formed between the mounting groove and the outer peripheral surface of the rotor core, the distance is 1.2 mm-1.4 mm, and the thickness of the wrapping piece along the radial direction of the rotor core is 0.8 mm-1.2 mm.

According to some embodiments of the invention, in a cross section perpendicular to the rotor axial direction, the rotor core is provided with a plurality of permanent magnet groups spaced apart along its circumference, each of the permanent magnet groups comprising a plurality of permanent magnet layers spaced apart along the radial direction of the rotor core, each of the permanent magnet layers comprising at least one of the permanent magnets.

According to some embodiments of the invention, the permanent magnet layer located at the outermost layer along the radial direction of the rotor core includes one of the permanent magnets extending perpendicular to the radial direction of the rotor core or extending obliquely to the radial direction of the rotor core; and/or the permanent magnet layer positioned at the innermost layer along the radial direction of the rotor core comprises two permanent magnets, one ends of the two permanent magnets close to the axis of the rotor core are close to each other, one ends of the two permanent magnets far away from the axis of the rotor core are far away from each other, and an air magnetic barrier is arranged between the close ends of the two permanent magnets; and/or the permanent magnet layer positioned in the middle layer along the radial direction of the rotor core comprises two permanent magnets, one ends of the two permanent magnets, which are close to the axis of the rotor core, are close to each other, and one ends of the two permanent magnets, which are far away from the axis of the rotor core, are far away from each other, and a magnetism isolating bridge is arranged between the close ends of the two permanent magnets.

The drive motor according to the embodiment of the present invention includes the rotor according to the embodiment of the present invention.

A vehicle according to an embodiment of the present invention includes a drive motor according to an embodiment of the present invention.

Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

The foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic structural view of a permanent magnet according to a first embodiment of the present invention;

fig. 2 is a top view of a permanent magnet according to a first embodiment of the present invention;

fig. 3 is a schematic structural view of a permanent magnet according to a second embodiment of the present invention;

fig. 4 is a top view of a permanent magnet according to a second embodiment of the present invention;

fig. 5 is a schematic structural view of a permanent magnet according to a third embodiment of the present invention;

fig. 6 is a top view of a permanent magnet according to a third embodiment of the present invention;

fig. 7 is a schematic structural view of a permanent magnet according to a fourth embodiment of the present invention;

fig. 8 is a front view of a permanent magnet according to a fourth embodiment of the present invention;

fig. 9 is a schematic structural view of a permanent magnet according to a fifth embodiment of the present invention;

fig. 10 is a front view of a permanent magnet according to a fifth embodiment of the present invention;

fig. 11 is a schematic structural view of a permanent magnet according to a sixth embodiment of the present invention;

fig. 12 is a front view of a permanent magnet according to a sixth embodiment of the present invention;

fig. 13 is a schematic structural view of a rotor according to an embodiment of the present invention;

FIG. 14 is a schematic structural view of a rotor according to an embodiment of the present invention, wherein the wrap is not shown;

FIG. 15 is an enlarged schematic view of the structure of FIG. 14 at circle M;

fig. 16 is a schematic view of a vehicle according to an embodiment of the invention.

Reference numerals:

a rotor 100; a driving motor 2000; a vehicle 3000;

a permanent magnet 10; a first portion 11; a second portion 12; a vortex weakening groove 13; a groove 131;

a rotor core 20; an air magnetic barrier 21; a magnetically isolated bridge 22; a mounting groove 23;

and a wrapper 30.

Detailed Description

Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

In the description of the invention, "a first feature" may include one or more such features, and "a plurality" may mean two or more, and that a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, or may include both the first and second features not being in direct contact but being in contact with each other through additional features therebetween, with the first feature "above", "over" and "above" the second feature including both the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature.

The permanent magnet 10 of the rotor 100 according to the embodiment of the present invention is described below with reference to the accompanying drawings.

Referring to fig. 1 to 12, a permanent magnet 10 of a rotor 100 according to an embodiment of the present invention may include: a first portion 11, a second portion 12 and a vortex reduction groove 13.

Specifically, the first portion 11 is provided in plural, and the vortex reduction grooves 13 are provided in at least one, and each vortex reduction groove 13 may separate two adjacent first portions 11. While the second portion 12 is used to connect together the two first portions 11 separated by any one of the eddy current weakening slots 13, so that the permanent magnet 10 is formed as one piece, ensuring the integrity of the permanent magnet 10.

In some embodiments, during the actual machining process, the permanent magnet 10 in a block shape may be subjected to a cutting process, the cutting groove is formed into the eddy current weakening groove 13, and the eddy current weakening groove 13 does not completely cut off the permanent magnet 10, so that the permanent magnet 10 forms a plurality of first portions 11 and a second portion 12 connecting two adjacent first portions 11.

For example, in some embodiments, the permanent magnet 10 has one eddy current reducing slot 13, the eddy current reducing slot 13 dividing the permanent magnet 10 into two first portions 11 and one second portion 12, the second portion 12 connecting the two first portions 11 together. In other embodiments, as shown in fig. 1 and 2, the permanent magnet 10 has three eddy current reducing grooves 13, the three eddy current reducing grooves 13 dividing the permanent magnet 10 into four first portions 11 and three second portions 12, each second portion 12 connecting adjacent two first portions 11 together so that the four first portions 11 are integrally connected with the three second portions 12.

The eddy current loss of the rotor 100 at high speed and high frequency can seriously restrict the improvement of high speed power, the application adopts the special dividing mode of the permanent magnet 10, the eddy current weakening groove 13 can weaken the eddy current loss of the permanent magnet 10, especially reduce the eddy current loss at high speed, reduce the temperature rise of the rotor 100, improve the high speed power of the rotor 100, improve the power density of the motor and prolong the service life of the motor.

In addition, by arranging the second parts 12, namely the eddy current weakening grooves 13 do not completely divide and break the permanent magnet 10, the integrity of the permanent magnet 10 is still maintained, meanwhile, the distance between the two adjacent first parts 11 is smaller, the two adjacent first parts 11 are not required to be bonded by glue, the process of dividing and bonding the permanent magnet 10 is omitted, meanwhile, the problem of high temperature resistance of the glue is not required to be considered, and the cost of dividing the magnetic steel is reduced.

According to the permanent magnet 10 of the rotor 100 of the embodiment of the invention, by arranging the eddy current weakening grooves 13, the first parts 11 and the second parts 12 connecting the two first parts 11, the eddy current loss of the rotor 100 and the temperature rise of the rotor 100 are reduced, the high-speed power of the rotor 100 is improved, the power density is improved, the service life of the motor is prolonged, and the rotor has the advantages of high integrity, low cost and the like.

In some embodiments of the present invention, as shown in fig. 2, 4, 6, 8, 10 and 12, the distance between adjacent two first portions 11 separated by the vortex reduction grooves 13 is D, and 0.1mm D0.15 mm. In other words, the groove width of the vortex reduction grooves 13 is D in the direction of separation of the vortex reduction grooves 13, that is, the direction of arrangement of the adjacent two first portions 11, and 0.1 mm.ltoreq.D.ltoreq.0.15 mm. In some embodiments, the spacing D may be 0.11mm, 0.12mm, 0.13mm, 0.14mm, etc.

In the above interval range, the groove width of the eddy current weakening groove 13 is smaller, and the interval between the adjacent two first parts 11 is smaller, so that on one hand, the eddy current loss effect of the permanent magnet 10 is weakened, and the temperature rise of the rotor 100 is greatly reduced; on the other hand, the two adjacent first parts 11 are not bonded by glue, so that the gluing process is omitted, the problem of high temperature resistance of glue is not needed to be considered, and the production cost is reduced.

In addition, in the production process, the vortex weakening groove 13 can be formed by cutting through a cutting line, and the groove width of the vortex weakening groove 13 is the diameter of the cutting line, so that the vortex weakening groove 13 is easier to process, and the production efficiency is improved.

Taking fig. 1 and 2 as an example, the permanent magnet 10 includes four first portions 11, three second portions 12, and three eddy current weakening grooves 13, the four first portions 11 are arranged in the A-A' direction, and any adjacent two first portions 11 are separated by the eddy current weakening grooves 13 and connected by the second portions 12. The spacing between any adjacent two of the first portions 11 in the A-A' direction is the groove width D of the vortex shedding groove 13.

In some embodiments, as shown in fig. 1-12, the first portions 11 are distributed at equal intervals, in other words, in embodiments in which the vortex weakening grooves 13 are multiple, the groove widths D of the vortex weakening grooves 13 are equal, so that the vortex weakening grooves 13 can be formed by the same processing technology, and are formed by cutting with the same specification of cutting lines, which is beneficial to reducing the difficulty of the processing technology, reducing the production cost and improving the production efficiency.

In some embodiments, as shown in fig. 1-12, the thicknesses of the first portions 11 along the separation direction are equal, which is beneficial to making the structural strength of the first portions 11 uniform, and improving the uniformity of eddy current weakening of the permanent magnet 10 everywhere, and avoiding the problem of local overhigh temperature rise of the rotor 100.

In some embodiments of the invention, the number of first portions 11 is 3-6. The excessive number of the first parts 11 can cause excessive segmentation of the permanent magnet 10, and the thickness of each segment is smaller, namely, the thickness of each first part 11 along the separation direction is smaller, so that the processing process difficulty is excessive and the mechanical strength of the permanent magnet 10 is not facilitated; the number of the first portions 11 is too small, and the eddy current weakening effect of the eddy current weakening groove 13 is not obvious, so that the eddy current loss and the temperature rise cannot be effectively reduced. In the above number range, the eddy current weakening effect can be ensured, the temperature rise of the rotor 100 can be effectively reduced, the structural strength of the permanent magnet 10 can be ensured, the processing difficulty of the permanent magnet 10 can be reduced, and the production cost can be reduced.

In some embodiments of the present invention, as shown in fig. 1-12, the plurality of first portions 11 are arranged in a first direction, as shown in fig. 1-6, the plurality of first portions 11 are arranged in A-A 'direction, as shown in fig. 7-12, and the plurality of first portions 11 are arranged in a B-B' direction. Corresponding in an embodiment in which the number of vortex reduction grooves 13 is plural, the plurality of vortex reduction grooves 13 are arranged in the first direction.

Further, as shown in fig. 1 to 2 and 5 to 6, the second portion 12 may be connected to an end portion of the first portion 11 in the second direction, or as shown in fig. 3 to 4, the second portion 12 may be connected to a middle portion of the first portion 11 in the second direction, wherein the first direction is perpendicular to the second direction.

Specifically, as shown in fig. 1-2, the second direction is the B-B ' direction, each second portion 12 is connected to the B end of the first portion 11 in the B-B ' direction, that is, the plurality of second portions 12 are connected to the same ends of the plurality of first portions 11, such that the corresponding plurality of eddy current weakening grooves 13 are cut from the same side (e.g., B ' side) of the permanent magnet 10, and each eddy current weakening groove 13 is an integral groove.

As shown in fig. 3 to 4, the second direction is the B-B ' direction, and each second portion 12 is connected to the middle of the first portion 11 in the B-B ' direction, that is, a plurality of second portions 12 are aligned in a row in the first direction, and each corresponding eddy current weakening groove 13 includes two groove bodies 131, and the two groove bodies 131 are cut from opposite sides (e.g., the B side and the B ' side) of the permanent magnet 10, respectively.

As shown in fig. 5 to 6, the second direction is the B-B 'direction, the plurality of second portions 12 are arranged along the first direction, and any adjacent two second portions 12 are respectively connected with different ends of the first portions 11 along the B-B' direction, as shown in fig. 6, along the direction from a 'to a, the first second portion 12 is connected with the B ends of the adjacent two first portions 11, the second portion 12 is connected with the B' ends of the adjacent two first portions 11, the third second portion 12 is connected with the B ends of the adjacent two first portions 11, that is, the plurality of second portions 12 are alternately distributed along the B-B 'direction, the corresponding plurality of eddy current weakening grooves 13 are alternately cut from opposite sides (such as the B side and the B' side) of the permanent magnet 10, and each of the eddy current weakening grooves 13 is an integral groove.

In some embodiments of the present invention, as shown in fig. 1 to 12, in the second direction, the permanent magnet 10 has an extension dimension L, and the eddy current weakening groove 13 has an extension dimension (i.e., the groove depth of the eddy current weakening groove 13) S, wherein 0.7 l.ltoreq.s.ltoreq.0.8L. Too large a groove depth of the eddy current weakening groove 13 may cause too small a size of the second portion 12, which is not beneficial to the overall mechanical strength of the permanent magnet 10, and how small a groove depth of the eddy current weakening groove 13 may cause weaker eddy current weakening effect, which cannot meet the requirements for reducing eddy current loss and temperature rise. In the above ratio range, the requirements of the permanent magnet 10 on both good mechanical strength and good eddy current weakening effect are satisfied.

In the embodiment in which the vortex reduction groove 13 is an integral groove, as shown in fig. 2 and 6, the groove depth of the vortex reduction groove 13 is the extension dimension of the integral groove along the second direction; in the embodiment in which the vortex reduction groove 13 includes the plurality of groove bodies 131, as shown in fig. 3 to 4, the groove depth of the vortex reduction groove 13 is the sum of the extension dimensions of the plurality of groove bodies 131 in the second direction. Specifically, as shown in fig. 3 and 4, the vortex reduction groove 13 includes two groove bodies 131, the extending dimensions of the two groove bodies 131 in the second direction are S1 and S2, respectively, and the extending dimension s=s1+s2 of the vortex reduction groove 13.

It should be noted that in some embodiments, S1 and S2 may not be equal; in other embodiments, S1 and S2 may be equal to provide greater structural strength to the permanent magnet 10 and a simpler manufacturing process.

In some embodiments of the present invention, as shown in fig. 1-12, the permanent magnet 10 may be rectangular parallelepiped and have a length direction, a width direction, and a thickness direction. In some embodiments, the first direction may be a length direction, as shown in fig. 1-6, and the second direction may be a width direction of the permanent magnet 10, and in other embodiments, the first direction may be a width direction, as shown in fig. 7-12, and the second direction may be a length direction of the permanent magnet 10.

In the above embodiment, the groove depth direction of the eddy current weakening groove 13 can be prevented from extending in the thickness direction of the permanent magnet 10 to avoid the problem that the permanent magnet 10 is cut by an operation error during the machining process, and also to avoid the influence of the mechanical strength due to the short dimension of the second portion 12 in the second direction after the machining of the eddy current weakening groove 13, and to avoid the influence of the mechanical strength and the workability due to the excessively small thickness of each first portion 11.

As shown in fig. 13 and 14, a rotor 100 according to an embodiment of the present invention includes a rotor core 20 and permanent magnets 10 of the rotor 100 according to an embodiment of the present invention, the permanent magnets 10 being mounted to the rotor core 20. Since the permanent magnet 10 of the rotor 100 according to the embodiment of the present invention has the above-described advantageous technical effects, the rotor 100 according to the embodiment of the present invention reduces the eddy current loss of the rotor 100 and the temperature rise of the rotor 100 by providing the eddy current weakening grooves 13, the first portions 11, and the second portions 12 connecting the two first portions 11, improves the high-speed power of the rotor 100, improves the power density, is advantageous for prolonging the service life of the motor, and has the advantages of high integrity, low cost, and the like.

In some embodiments of the present invention, the rotor core 20 may be provided with mounting slots 23 penetrating in the axial direction of the rotor 100, and at least one permanent magnet 10 may be mounted in each of the mounting slots 23.

In an embodiment in which a plurality of permanent magnets 10 are mounted in the mounting groove 23, the plurality of permanent magnets 10 may be arranged in the axial direction of the rotor 100. In the production process, the size of each permanent magnet 10 can be equal, and the length requirements of the rotors 100 with different specifications can be met by adjusting the number of the permanent magnets 10 installed in the installation groove 23. The universality of the permanent magnet 10 is improved, the production efficiency is improved, and the production cost is reduced.

In addition, in the embodiment in which the permanent magnet 10 includes the first portion 11, the second portion 12 and the eddy current weakening grooves 13, after the permanent magnet 10 is mounted on the rotor core 20, an axial separation as shown in fig. 1 to 6 or a circumferential separation as shown in fig. 7 to 12 can be formed, which can satisfy the requirements of reducing eddy current loss and reducing temperature rise.

In other words, the length direction (A-A' direction) of the permanent magnet 10 corresponds to the axial direction of the rotor 100; the cross section of the permanent magnet 10 perpendicular to the length direction (i.e., the plane corresponding to B-B '-C') corresponds to the cross section shown in fig. 13 to 15; the width direction (B-B' direction) of the permanent magnet 10 corresponds to the length direction of the elongated cross section of the permanent magnet 10 shown in fig. 13 to 15; the thickness direction (C-C' direction) of the permanent magnet 10 corresponds to the width direction of the elongated cross section of the permanent magnet 10 shown in fig. 13 to 15.

In some embodiments of the present invention, as shown in fig. 13 and 14, the rotor 100 further includes a wrapping member 30, where the wrapping member 30 wraps the outer peripheral surface of the rotor core 20, so as to apply a high-strength wrapping force to the rotor core 20, and pinch the rotor core 20, so that radial deformation of the rotor 100 at a high speed is greatly reduced, thereby effectively reducing the risk of throwing out the permanent magnet 10 and the rotor core 20 at a high speed, improving mechanical strength of the rotor 100, increasing allowable linear speed of the rotor 100, and being beneficial to improving service life of the high-speed motor.

In some embodiments, the wrap 30 may be a carbon fiber composite material having the advantages of high strength, high modulus fibers, and the like. In the production process, the carbon fiber composite material may be impregnated with resin and wound around the rotor core 20 to form a seamless winding structure, thereby forming a carbon fiber sleeve. The winding stability and the tightening force to the rotor core 20 are ensured, and the adhesion between the carbon fiber composite material and the rotor core 20 can be ensured after the resin is cured, thereby forming the carbon fiber composite material winding-reinforced high-speed motor rotor 100.

Alternatively, the resin may include epoxy resin, phenolphthalein resin, and the like.

Optionally, the carbon fiber composite material can be a carbon fiber material of T700 and T800, and the mechanical property of the carbon fiber composite material can better meet the requirement of high-strength application.

In some embodiments, the carbon fiber composite material is wrapped with a winding tension greater than 600N, for example, the winding tension may be 600N-800N, so as to better ensure the bonding strength and the pretightening force between the carbon fiber composite material and the outer peripheral surface of the rotor core 20.

In some embodiments, the thickness of the wrap 30 is 0.8mm to 1.2mm in the radial direction of the rotor core 20. For example, in some embodiments, the wrap 30 may have a thickness of 0.8mm, 0.9mm, 1.0mm, 1.1mm, 1.2mm, etc. In the thickness range, the mechanical strength of the rotor 100 can meet the high-speed rotation range of 26000 rpm-40000 rpm, the high-speed performance of the rotor 100 is greatly improved, and the use requirement of a motor with higher rotation speed is met.

Further, as shown in fig. 13 to 15, the rotor core 20 is provided with mounting grooves 23, and the permanent magnets 10 are mounted in the mounting grooves 23 to form the in-line rotor 100. And a magnetic shielding bridge 22 is formed between the mounting groove 23 and the outer circumferential surface of the rotor core 20 to reduce magnetic leakage.

When the rotating speed of the rotor reaches 26000rpm and above, and the rotor assembly in the related art does not adopt a carbon fiber winding structure, the thickness of the magnetic isolation bridge outside the mounting groove needs to be more than 2mm to ensure the yield strength of the silicon steel sheet and the radial deformation of the outer peripheral surface of the rotor core, and at the moment, the magnetic isolation bridge has more magnetic leakage and serious motor performance loss.

In some embodiments of the present invention, the rotor core 20 is wrapped by the wrapping member 30, and when the thickness of the wrapping member 30 reaches above 0.8mm, the thickness of the magnetic isolation bridge 22 (i.e. the distance between the end of the mounting groove 23 and the outer peripheral surface of the rotor core 20) is 1.2 mm-1.4 mm, so as to meet the radial deformation of the outer peripheral surface of the rotor core 20, the strain of the rotor 100 at 26000rpm is reduced by 90%, the radial displacement is reduced by 50%, which greatly improves the highest rotating speed of the motor, and the mechanical strength of the rotor 100 meets the application requirement of 26000rpm of the high-speed motor when the thickness of the magnetic isolation bridge 22 is only 1.2 mm; the thickness of the magnetic isolation bridge 22 is reduced, and the magnetic leakage is reduced, so that the output torque and the output power of the motor at high speed are greatly improved.

In some embodiments of the present invention, as shown in fig. 14 and 15, the rotor core 20 is provided with a plurality of permanent magnet groups arranged at intervals in the circumferential direction of the rotor core 20 in a section perpendicular to the axial direction of the rotor 100. Specifically, the rotor core 20 may be provided with N pairs of mounting groove groups, N being 2 or an integer multiple of 2, for example, N being 6 in the example shown in fig. 14.

The output torque formula of the motor is: tem=2/3×p× (iq×ψ+ (Ld-Lq) ×id×iq), where p is the number of poles of the rotor 100, iq and id are currents, ld and Lq are inductances, and ψ is the magnetic flux. In order to improve the torque density of the motor, the reluctance torque of the motor is effectively used, and the output torque performance of the motor can be improved by effectively increasing the reluctance torque under the condition that the flux linkage is fixed as can be seen from the output torque formula of the motor.

In some embodiments of the present invention, as shown in fig. 14 and 15, each permanent magnet group includes a plurality of permanent magnet layers, each including at least one permanent magnet 10, arranged at intervals in the radial direction of the rotor core 20 to form a permanent magnet 10 topology, as shown in fig. 14 and 15, of three layers of permanent magnets 10 topology. The multi-layer permanent magnet 10 topological structure can effectively improve the reluctance torque of the motor, and can improve the output torque performance of the motor and the torque density of the motor under the condition that the space of the rotor core 20 is limited.

In some embodiments of the present invention, as shown in fig. 15, among the plurality of permanent magnet layers in the radial direction of the rotor core 20, the permanent magnet layer located at the outermost layer may include one permanent magnet 10, the permanent magnet 10 may extend perpendicular to the radial direction of the rotor core 20, or the permanent magnet 10 may extend obliquely to the radial direction of the rotor core 20 to form a linear type permanent magnet 10. In other words, in a section perpendicular to the axial direction of the rotor core 20, the permanent magnet 10 may have a long strip shape in cross section, and a line connecting midpoints of both ends of the long strip shape is a center line of the permanent magnet 10, and a line connecting a center point of the permanent magnet 10 and a center point of the rotor core 20 is perpendicular to the center line of the permanent magnet 10 or is disposed at an acute angle to the center line of the permanent magnet 10.

The permanent magnet layer at the outermost layer has limited space, and in the limited space, the linear topological structure not only can improve the torque performance, but also has good torque fluctuation performance. In some embodiments, the in-line permanent magnet 10 is line symmetric with respect to the center point of the permanent magnet 10 and the center point of the rotor core 20.

In some embodiments of the present invention, as shown in fig. 15, among the plurality of permanent magnet layers, the permanent magnet layer located at the innermost layer may include two permanent magnets 10, one ends (i.e., outer ends) of the two permanent magnets 10, which are far from the axis of the rotor core 20, are far from each other, and one ends (i.e., inner ends) of the two permanent magnets 10, which are near the axis of the rotor core 20, are near each other, in the radial direction of the rotor core 20, such that the two permanent magnets 10 generally constitute a V-shaped permanent magnet 10 structure, and the opening direction of the V-shape is directed away from the axis of the rotor core 20. An air barrier 21 is provided between the mutually adjacent ends of the two permanent magnets 10, in other words, an air barrier 21 is provided between two mounting slots 23 for mounting the permanent magnets 10.

The V-shaped permanent magnet 10 structure can effectively ensure the magnetism gathering effect, increase the reluctance torque, reduce the consumption of the permanent magnet 10 by matching with the air magnetic barrier 21 and reduce the cost. In some embodiments, the V-shaped permanent magnet 10 structure is line symmetric about the center point of the air barrier 21 and the center point of the rotor core 20. The air barrier 21 and the mounting groove 23 may be separated by a magnetic barrier 22.

In some embodiments of the present invention, as shown in fig. 15, among the plurality of permanent magnet layers, the permanent magnet layer located in the middle layer may include two permanent magnets 10 in the radial direction of the rotor core 20, one ends (i.e., outer ends) of the two permanent magnets 10 remote from the axis of the rotor core 20 being away from each other, and one ends (i.e., inner ends) of the two permanent magnets 10 close to the axis of the rotor core 20 being close to each other, such that the two permanent magnets 10 generally constitute a V-shaped permanent magnet 10 structure, and the opening direction of the V-shape is directed away from the axis of the rotor core 20. A magnetic barrier bridge 22 is provided between the mutually adjacent ends of the two permanent magnets 10.

The structure can ensure the magnetic focusing effect, so that no-load counter potential harmonic tends to be sinusoidal, and the waveform is better. In some embodiments, the V-shaped permanent magnet 10 structure is line symmetric about the center point of the magnetically isolated bridge 22 and the center point of the rotor core 20. It should be noted that the permanent magnet group may include multiple intermediate permanent magnet layers as described above, or may include one intermediate permanent magnet layer as shown in fig. 15.

In some embodiments of the present invention, as shown in fig. 15, the permanent magnet group includes three permanent magnet layers, wherein the permanent magnet layer located at the outermost layer is a linear permanent magnet 10, the permanent magnet layer located at the middle layer is a V-shaped permanent magnet 10 structure spaced apart by a magnetism isolating bridge 22, and the permanent magnet layer located at the innermost layer is a V-shaped permanent magnet 10 structure spaced apart by an air magnetism barrier 21. The special multilayer permanent magnet 10 topological structure not only effectively improves the reluctance torque of the motor and the output torque of the motor, but also improves the harmonic component of no-load counter potential and reduces torque fluctuation.

The driving motor 2000 according to the embodiment of the present invention includes the rotor 100 according to the embodiment of the present invention. Since the rotor 100 according to the embodiment of the present invention has the above advantageous technical effects, the driving motor 2000 according to the embodiment of the present invention reduces the eddy current loss of the rotor 100 and the temperature rise of the rotor 100 by providing the eddy current weakening groove 13, the first portion 11, and the second portion 12 connecting the two first portions 11, improves the high-speed power of the rotor 100, improves the power density, is advantageous for prolonging the service life of the motor, and has the advantages of high integrity, low cost, and the like. The driving motor 2000 can be used as a high-speed permanent magnet motor, and has the advantages of small volume, high efficiency, high power density, low loss and the like.

In a specific example of the present invention, the rotor 100 includes a rotor core 20, permanent magnets 10, and a wrapper 30, the permanent magnets 10 are mounted embedded in the rotor core 20 in a multi-layered topology, and the permanent magnets 10 include a first portion 11, a second portion 12, and eddy current weakening grooves 13. The wrapping member 30 wraps the rotor core 20, and the wrapping member 30 is made of a carbon fiber composite material.

The special magnetic steel segmentation technology is combined with the multilayer permanent magnet 10 topological structure and the carbon fiber wrapping technology, so that the mechanical strength of the rotor 100 is improved, the rotating speed requirement of the ultra-high-speed motor is met, meanwhile, the thickness of the magnetism isolating bridge 22 is reduced, the magnetic resistance torque component is improved, the salient pole rate of the motor is improved, the output torque performance of the motor is improved, the eddy current loss of the permanent magnet 10 is reduced, the temperature rise of the high-speed rotor 100 is reduced, the output torque and the output power of the motor at high speed are improved, and the two technologies are combined to enable the permanent magnet motor to be capable of developing towards the trend of higher power and higher rotating speed.

The vehicle 3000 according to the embodiment of the invention includes a drive motor according to the embodiment of the invention. Since the driving motor 2000 according to the embodiment of the present invention has the above advantageous technical effects, the vehicle 3000 according to the embodiment of the present invention reduces the eddy current loss of the rotor 100 and the temperature rise of the rotor 100, improves the high-speed power of the rotor 100, improves the power density, is advantageous in prolonging the service life of the motor, and has the advantages of high integrity, low cost, and the like by providing the eddy current weakening groove 13, the first portion 11, and the second portion 12 connecting the two first portions 11.

It should be noted that the vehicle 3000 may be a new energy vehicle. The new energy automobile comprises a pure electric automobile, a range-extended electric automobile, a hybrid electric automobile, a fuel cell electric automobile, a hydrogen engine automobile and the like. Further, the motor provided by any of the above designs may be used as the drive motor 2000 of the vehicle 3000. Specifically, the drive motor 2000 can individually realize the function device start of the vehicle 3000. Alternatively, the drive motor 2000 may cooperate with other drive devices on the vehicle 3000 to achieve proper operation of the functional devices on the vehicle 3000. The functional devices of the vehicle 3000 may be any one or any combination of the following: wheels, air conditioners, light assemblies, etc.

Other configurations and operations of the vehicle 3000, the driving motor 2000, and the rotor 100 according to the embodiment of the present invention are known to those skilled in the art, and will not be described in detail herein.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.

In the description herein, reference to the terms "embodiment," "specific embodiment," "example," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims (15)

1. A permanent magnet of a rotor, comprising:

a plurality of first portions;

at least one vortex weakening groove;

a second portion for connecting two adjacent first portions separated by any one of the vortex reduction grooves.

2. A permanent magnet of a rotor according to claim 1, wherein the distance between two adjacent first portions separated by the eddy current weakening slots is 0.1mm to 0.15mm.

3. The permanent magnet of a rotor according to claim 1, wherein a plurality of the first portions are equally spaced apart, and a thickness of the plurality of the first portions in a separation direction is equal.

4. A permanent magnet of a rotor according to claim 1, characterized in that the number of the first parts is 3-6.

5. A permanent magnet for a rotor according to any one of claims 1-4, characterized in that a plurality of the first portions are arranged in a first direction, the second portions being connected to the end portions or the middle portions of the first portions in a second direction, the first direction being perpendicular to the second direction.

6. The permanent magnet of the rotor according to claim 5, wherein the permanent magnet has an extension dimension L and the eddy current weakening slot has an extension dimension S in the second direction, wherein,

0.7L≤S≤0.8L。

7. the permanent magnet of the rotor according to claim 5, wherein the permanent magnet has a length direction, a width direction and a thickness direction, wherein,

the first direction is the length direction, and the second direction is the width direction of the permanent magnet; or,

the first direction is the width direction, and the second direction is the length direction of the permanent magnet.

8. A rotor comprising a rotor core and a permanent magnet of the rotor according to any one of claims 1-7, the permanent magnet being mounted to the rotor core.

9. The rotor as set forth in claim 8, further comprising:

and the wrapping piece wraps the outer peripheral surface of the rotor core.

10. The rotor of claim 9, wherein the wrap is a carbon fiber composite material and is wound outside the rotor core by impregnating resin, the wrap having a winding tension of greater than 600N.

11. The rotor of claim 9, wherein the rotor core is provided with a mounting groove for mounting the permanent magnet, a magnetic shielding bridge is formed between the mounting groove and an outer circumferential surface of the rotor core, a distance is 1.2mm to 1.4mm, and a thickness of the wrap in a radial direction of the rotor core is 0.8mm to 1.2mm.

12. A rotor according to any one of claims 8-11, wherein the rotor core is provided with a plurality of permanent magnet groups spaced apart along its circumference in a cross section perpendicular to the rotor axis, each of the permanent magnet groups comprising a plurality of permanent magnet layers spaced apart along the radial direction of the rotor core, each of the permanent magnet layers comprising at least one of the permanent magnets.

13. The rotor as set forth in claim 12, wherein,

the permanent magnet layer at the outermost layer along the radial direction of the rotor core comprises one permanent magnet which extends perpendicular to the radial direction of the rotor core or is inclined to the radial direction of the rotor core; and/or the number of the groups of groups,

the permanent magnet layer positioned at the innermost layer along the radial direction of the rotor core comprises two permanent magnets, one ends of the two permanent magnets, which are close to the axis of the rotor core, are close to each other, and one ends of the two permanent magnets, which are far away from the axis of the rotor core, are far away from each other, and an air magnetic barrier is arranged between the close ends of the two permanent magnets; and/or the number of the groups of groups,

the permanent magnet layer positioned in the middle layer along the radial direction of the rotor core comprises two permanent magnets, one ends of the two permanent magnets, which are close to the axis of the rotor core, are close to each other, and one ends of the two permanent magnets, which are far away from the axis of the rotor core, are far away from each other, and a magnetic isolation bridge is arranged between the close ends of the two permanent magnets.

14. A drive motor, characterized by comprising a rotor according to any one of claims 8-13.

15. A vehicle comprising the drive motor according to claim 14.