CN216904468U - Rotor, permanent-magnet machine and vehicle - Google Patents

Abstract

The utility model discloses a rotor, a permanent magnet motor and a vehicle, wherein the rotor iron core comprises a rotor iron core and a plurality of permanent magnets, the rotor iron core is provided with a plurality of accommodating grooves, and the accommodating grooves are arranged at intervals along the circumferential direction of the rotor iron core; the permanent magnets correspond to the accommodating grooves one by one, and the permanent magnets are arranged in the corresponding accommodating grooves; and the outer side surface of the permanent magnet and the outer side groove wall of the accommodating groove are arranged at intervals to form a spacing part. The permanent magnet motor with the rotor provided by the embodiment of the utility model has the advantages of good performance, good operation stability and the like.

Description

Rotor, permanent-magnet machine and vehicle

Technical Field

The utility model relates to the technical field of permanent magnet motors, in particular to a rotor, a permanent magnet motor and a vehicle.

Background

The permanent magnet motor has the advantages of simple structure, high efficiency, high power density and the like, and is widely used in the fields of new energy automobiles, electric bicycles, household appliances and the like. However, if the permanent magnet motor is not properly designed or used, irreversible demagnetization may occur under the action of an armature reaction magnetic field generated by an impact current, high temperature and impact collision, which affects the performance of the permanent magnet motor and reduces the operation stability of the permanent magnet motor.

When the permanent magnet motor normally works, the axis of an armature magnetic field is not coincident with the axis of the permanent magnet magnetic field, the working point magnetic density of the permanent magnet is reduced by an armature reaction demagnetization magnetic field, particularly when the permanent magnet motor has a three-phase short circuit fault, the position of the axis of the armature magnetic field can be aligned with the position of the axis of the permanent magnet magnetic field, at the moment, the demagnetization effect is the most serious, the permanent magnet can be irreversibly demagnetized, and the performance and the operation stability of the permanent magnet motor are poor.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, the embodiment of the utility model provides a rotor, which is used for reducing the demagnetization phenomenon and improving the performance and the operation stability of a permanent magnet motor.

The embodiment of the utility model provides a permanent magnet motor, which is used for improving the performance and the operation stability of the permanent magnet motor.

Embodiments of the present invention provide a vehicle to improve performance and operational stability of the vehicle.

The rotor comprises a rotor core and a plurality of permanent magnets, wherein the rotor core is provided with a plurality of accommodating grooves which are arranged at intervals along the circumferential direction of the rotor core; the permanent magnets correspond to the accommodating grooves one by one, and the permanent magnets are arranged in the corresponding accommodating grooves; wherein the outer side of the permanent magnet and the outer side groove wall of the accommodating groove are arranged at intervals to form a spacing part.

In some embodiments, the permanent magnet motor further comprises a plurality of non-magnetic-conductive pieces, the non-magnetic-conductive pieces correspond to the accommodating grooves one to one, the non-magnetic-conductive pieces are arranged in the corresponding spacing parts of the accommodating grooves, the outer side surfaces of the non-magnetic-conductive pieces abut against the outer side groove walls of the accommodating grooves, and the inner side surfaces of the non-magnetic-conductive pieces abut against the outer side surfaces of the permanent magnets.

In some embodiments, the outer side surface of the non-magnetic conductive member is in accordance with the shape of the outer groove wall of the accommodating groove, and the inner side surface of the non-magnetic conductive member is in accordance with the shape of the outer side surface of the permanent magnet.

In some embodiments, the non-magnetic conductive member is connected to at least one of an outer groove wall of the receiving groove and a groove side wall of the receiving groove, and the non-magnetic conductive member is connected to the permanent magnet.

In some embodiments, the non-magnetic part is a colloid, the non-magnetic part is connected with the outer groove wall of the accommodating groove and the groove side wall of the accommodating groove through bonding, and the non-magnetic part is connected with the permanent magnet through bonding.

In some embodiments, the non-magnetic conductive member is an epoxy or plastic member.

In some embodiments, the spacer has a dimension in the medial-lateral direction of 0.5mm to 1mm, and the outer groove wall has a dimension in the medial-lateral direction of 0.8mm to 1.2 mm.

In some embodiments, an outer side groove wall of the receiving groove includes a first outer protrusion and a second outer protrusion, the first outer protrusion and the second outer protrusion are arranged at intervals in a circumferential direction of the rotor core, and an inner side groove wall of the receiving groove includes a first inner protrusion and a second inner protrusion, the first inner protrusion and the second inner protrusion are arranged in an axial direction of the rotor core.

In some embodiments, the first outer protrusion and the second outer protrusion are symmetrically arranged about a centerline of the receiving groove, and the first inner protrusion and the second inner protrusion are symmetrically arranged about the centerline of the receiving groove.

The permanent magnet motor comprises a rotor and a stator, wherein the rotor is the rotor in any one of the embodiments; the stator has a stator bore and the rotor is rotatably disposed within the stator bore.

The rotor provided by the embodiment of the utility model has the advantages of good performance, good running stability and the like.

In some embodiments, the ratio of the axial dimension of the stator to the outer diameter of the stator is 0.15 to 0.20 and the ratio of the inner diameter of the stator to the outer diameter of the stator is 0.48 to 0.57.

The vehicle provided by the embodiment of the utility model comprises the permanent magnet motor provided by any embodiment.

The vehicle provided by the embodiment of the utility model has the advantages of good performance, good running stability and the like.

Drawings

Fig. 1 is a schematic structural view of a rotor according to an embodiment of the present invention.

Fig. 2 is a schematic view of the structure of fig. 1 with the non-magnetic conductive member and a permanent magnet removed.

Fig. 3 is a schematic structural view of a stator of a permanent magnet motor according to an embodiment of the present invention (stator windings are not shown).

Fig. 4 is a schematic structural diagram of the stator punching sheet in fig. 3.

Fig. 5 is a graph comparing effects of the related art permanent magnet motor using different rotors.

Fig. 6 is a graph showing the effect of comparing the demagnetization rates of a permanent magnet motor according to an embodiment of the present invention and a permanent magnet motor according to the related art.

Fig. 7 is a diagram of the back emf versus back emf effect of a permanent magnet machine according to an embodiment of the present invention and a related art permanent magnet machine.

Reference numerals:

a rotor 100;

a rotor core 1; an accommodating tank 101; an outer tank wall 1011; a first outer protrusion 10111; a second outer protrusion 10112; inner pocket walls 1012; a first inner projection 10121; a second inner projection 10122; slot side walls 1013; a spacer section 102; a pole portion 103;

a permanent magnet 2;

a non-magnetic conductive member 3;

a stator 200;

a stator core 4; a stator bore 401; a stator outer peripheral surface 402; a stator inner peripheral surface 403;

a stator punching sheet 5; a convex portion 501; a recess 502.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.

As shown in fig. 1 and 2, a rotor 100 according to an embodiment of the present invention includes a rotor core 1 and a plurality of permanent magnets 2, the rotor core 1 having a plurality of receiving grooves 101, the plurality of receiving grooves 101 being arranged at intervals in a circumferential direction of the rotor core 1. The plurality of permanent magnets 2 correspond to the plurality of accommodating grooves 101 one to one, and the permanent magnets 2 are arranged in the corresponding accommodating grooves 101.

The outer side surface of the permanent magnet 2 and the outer groove wall 1011 of the housing groove 101 are spaced apart from each other to form a spacer 102. In other words, the dimension of the accommodation groove 101 in the radial direction of the rotor core 1 is larger than the dimension of the permanent magnet 2 in the radial direction of the rotor core 1, and the outer groove wall 1011 of the accommodation groove 101 is spaced apart from the outer side surface of the permanent magnet 2 in the radial direction of the rotor core 1.

Here, inward refers to a direction adjacent to the axis of rotor core 1 on a plane perpendicular to the axis of rotor core 1, and outward refers to a direction away from the axis of rotor core 1 on a plane perpendicular to the axis of rotor core 1.

Permanent-magnet machine with rotor 100 of utility model embodiment, rotor 100 establishes the inside at permanent-magnet machine's stator, specifically establishes rotor 100 in the stator hole of stator, and the interval sets up between the lateral surface of permanent magnet 2 and the outside cell wall 1011 of holding tank 101 for distance between the lateral surface of permanent magnet 2 and the armature winding (stator winding) is far away, thereby can effectively reduce the demagnetization effect of armature reaction, thereby can improve permanent-magnet machine's performance and operating stability.

Therefore, the rotor 100 according to the embodiment of the present invention has the advantages of being not easy to demagnetize.

The permanent magnet motor with the rotor 100 of the embodiment of the utility model has the advantages of good performance, good operation stability and the like.

Alternatively, as shown in fig. 1 and 2, the rotor core 1 includes a plurality of rotor sheets, and the plurality of rotor sheets are stacked in an axial direction of the rotor core 1 to form the rotor core. Each rotor punching sheet comprises 2n pole parts 103, the 2n pole parts 103 are arranged at intervals along the circumferential direction of the rotor core 1, a mounting groove is defined between every two adjacent pole parts 103, and 2n mounting grooves are defined by the 2n pole parts 103. Optionally, the pole 103 is sector shaped.

For example, as shown in fig. 1 and 2, 14 pole portions 103 and mounting grooves are provided. The mounting grooves of the axially adjacent rotor sheets of the rotor core 1 are in one-to-one correspondence, and the corresponding mounting grooves are communicated to form a receiving groove 101.

In some embodiments, the rotor 100 further includes a plurality of non-magnetic members 3, the plurality of non-magnetic members 3 correspond to the plurality of receiving grooves 101 one to one, and the non-magnetic members 3 are disposed in the spacers 102 of the corresponding receiving grooves 101. The outer side surface of the non-magnetic conductive member 3 abuts against the outer side groove wall 1011 of the accommodation groove 101, and the inner side surface of the non-magnetic conductive member 3 abuts against the outer side surface of the permanent magnet 2.

For example, as shown in fig. 1, in the inward and outward direction, the inner side surface of the permanent magnet 2 abuts against the inner groove wall 1012 of the accommodation groove 101, the outer side surface of the permanent magnet 2 abuts against the inner side surface of the non-magnetic member 3, and the outer side surface of the non-magnetic member 3 abuts against the outer groove wall 1011 of the accommodation groove 101, whereby the permanent magnet 2 is positioned in the inward and outward direction.

In fact, the outer slot walls 1011 of the receiving slot 101 form outer magnetic bridges of the rotor core 1.

From this, on the one hand, conveniently fix a position permanent magnet 2 in rotor core 1's holding tank 101 to make things convenient for the equipment of rotor 100, be favorable to improving the packaging efficiency of rotor 100. On the other hand, the non-magnetic conductive part 3 can ensure the magnetic isolation effect of the outer magnetic bridge and reduce the magnetic leakage coefficient of the permanent magnet motor, thereby being beneficial to improving the performance of the permanent magnet motor.

Of course, in other embodiments, the non-magnetic conducting members may not be disposed within the spacer portions of the rotor. In other words, the spacer of the rotor is filled with a gas, which may be air. At the moment, the permanent magnet can be connected with the groove wall of the accommodating groove in a bonding mode and the like, so that the permanent magnet is stably fixed in the accommodating groove.

Alternatively, the non-magnetic conductive member 3 is connected to at least one of the outer groove wall 1011 of the receiving groove 101 and the groove side wall 1013 of the receiving groove 101, and the non-magnetic conductive member 3 is connected to the permanent magnet 2.

For example, the non-magnetic conductive member 3 is connected to both the outer tank wall 1011 of the receiving tank 101 and the tank side wall 1013 of the receiving tank 101, and the non-magnetic conductive member 3 is connected to the permanent magnet 2.

That is, permanent magnet 2 is connected to the groove wall (including outer groove wall 1011 and groove side wall 1013) of accommodation groove 101 through non-magnetic conductive member 3.

From this, can be more stable fix permanent magnet 2 in rotor core 1's holding tank 101, be favorable to further improving permanent magnet motor's stability.

Alternatively, the non-magnetic member 3 is made of a colloid, the non-magnetic member 3 is bonded to the outer wall 1011 of the housing groove 101 and the wall 1013 of the housing groove 101, and the non-magnetic member 3 is bonded to the permanent magnet 2.

Specifically, when the permanent magnet 2 is mounted, the permanent magnet 2 may be first positioned in the accommodating groove 101, so that the permanent magnet 2 and the outer groove wall 1011 of the accommodating groove 101 are spaced apart to form the spacer 102; then, a glue solution is poured into the spacer 102, and after the glue solution is solidified to form a glue solution, the non-magnetic conductive member 3 is adhesively connected to the outer tank wall 1011 of the housing tank 101 and the tank side wall 1013 of the housing tank 101, and the non-magnetic conductive member 3 is adhesively connected to the permanent magnet 2.

Therefore, the colloid can ensure the magnetic isolation effect of the outer magnetic bridge and reduce the magnetic leakage coefficient of the permanent magnet motor; and permanent magnet 2 can be more stably fixed in accommodating groove 101 of rotor core 1 to further facilitate the equipment of rotor 100, further improve the packaging efficiency of rotor 100.

In other embodiments, the non-magnetic conductive member 3 is an epoxy or plastic member. In other words, the material of the non-magnetic conductive member 3 is epoxy resin or plastic.

At this time, the non-magnetic conductive member 3 and the outer groove wall 1011 of the accommodating groove 101 and the groove side wall 1013 of the accommodating groove 101 may be connected by adhesion, and the non-magnetic conductive member 3 and the permanent magnet 2 may be connected by adhesion.

Alternatively, the outer side surface of the non-magnetic member 3 is identical in shape to the outer groove wall 1011 of the accommodating groove 101, and the inner side surface of the non-magnetic member 3 is identical in shape to the outer side surface of the permanent magnet 2.

For example, as shown in fig. 1 and 2, the outer side surfaces of the non-magnetic conductive member 3, the outer groove walls 1011 of the accommodating groove 101, and the outer side surfaces of the permanent magnets 2 are all arc-shaped surfaces.

Therefore, the contact areas between the outer side surface of the non-magnetic-conductive member 3 and the outer side groove wall 1011 of the accommodating groove 101 and between the inner side surface of the non-magnetic-conductive member 3 and the outer side surface of the permanent magnet 2 are large, which is beneficial to more stably fixing the permanent magnet 2 in the accommodating groove 101 of the rotor core 1 and improving the performance of the permanent magnet motor with the rotor 100.

Alternatively, the spacer 102 may have a dimension in the medial-lateral direction of 0.5mm to 1mm, and the outer groove wall 1011 may have a dimension in the medial-lateral direction of 0.8mm to 1.2 mm. In other words, the spacer 102 has a thickness of 0.5mm to 1mm, and the outer groove wall 1011 has a thickness of 0.8mm to 1.2 mm.

For example, the spacer 102 has a dimension of 0.75mm in the inward and outward direction, and the outer groove wall 1011 has a dimension of 1mm in the inward and outward direction.

Therefore, the risk of demagnetization of the rotor 100 is reduced, and the permanent magnet 2 can be stably limited in the inner and outer directions by using the outer groove wall 1011, so that the performance of the permanent magnet motor with the rotor 100 of the embodiment of the utility model is improved.

Alternatively, the outer groove wall 1011 of the accommodation groove 101 includes a first outer protrusion 10111 and a second outer protrusion 10112, and the first outer protrusion 10111 and the second outer protrusion 10112 are arranged at intervals in the circumferential direction of the rotor core 1. The inner groove wall 1012 of the receiving groove 101 includes a first inner protrusion 10121 and a second inner protrusion 10122, and the first inner protrusion 10121 and the second inner protrusion 10122 are arranged in the axial direction of the rotor core 1.

For example, as shown in fig. 1 and 2, the pole portion 103 has a first side surface and a second side surface that are opposite in the circumferential direction of the rotor core 1. The two adjacent pole portions 103 are respectively a first pole portion and a second pole portion, and a receiving groove 101 is defined between the first pole portion and the second pole portion. A first outer protrusion 10111 and a first inner protrusion 10121 are provided on a first lateral surface of the first pole part, and a second outer protrusion 10112 and a second inner protrusion 10122 are provided on a second lateral surface of the second pole part.

Therefore, the communication area between the pole parts with different polarities can be reduced as much as possible, so that the magnetic flux leakage phenomenon of the rotor 100 is reduced, and the performance of the permanent magnet motor with the rotor 100 of the embodiment of the utility model is further improved.

Alternatively, the first and second outer protrusions 10111 and 10112 are symmetrically arranged about a center line of the receiving groove 101, and the first and second inner protrusions 10121 and 10122 are symmetrically arranged about a center line of the receiving groove 101.

It can be understood that the center line of the receiving groove 101 is perpendicular to the axis of the rotor core 100.

The permanent magnet motor according to the embodiment of the present invention includes a rotor 100 and a stator 200 (as shown in fig. 3 and 4), and the rotor 100 is the rotor 100 according to any of the above embodiments. The stator 200 has a stator bore 401, and the rotor 100 is rotatably provided in the stator bore 401.

Therefore, the permanent magnet motor provided by the embodiment of the utility model has the advantages of good performance, good operation stability and the like.

Alternatively, the stator 200 includes a stator core 4 and a stator winding (not shown in the drawings), and the stator core 4 includes a plurality of stator punching sheet groups, and the plurality of stator punching sheet groups are arranged in a stacked manner in the axial direction of the stator core 4.

Each stator punching sheet group comprises a plurality of stator punching sheets 5, the plurality of stator punching sheets 5 are arranged along the circumferential direction of the stator core 4, and two adjacent stator punching sheets 5 in the circumferential direction of the stator core 4 are connected.

Alternatively, as shown in fig. 3 and 4, each stator lamination 5 has a convex portion 501 and a concave portion 502 opposed in the circumferential direction of the stator core 4. The three stator punching sheets sequentially arranged in the circumferential direction of the stator core 4 are a first stator punching sheet, a second stator punching sheet and a third stator punching sheet, a convex portion 501 of the first stator punching sheet is in inserting fit with a concave portion 502 of the second stator punching sheet, and a convex portion 501 of the second stator punching sheet is in inserting fit with a concave portion 502 of the third stator punching sheet, so that the first stator punching sheet, the second stator punching sheet and the third stator punching sheet are connected.

Alternatively, the ratio of the axial dimension of the stator 200 to the outer diameter of the stator 200 is 0.15 to 0.20, and the ratio of the inner diameter of the stator 200 to the outer diameter of the stator 200 is 0.48 to 0.57.

As shown in fig. 3, the stator 200 includes a stator outer peripheral surface 402 and a stator inner peripheral surface 403 facing each other in the inward and outward directions, the outer diameter of the stator 200 is the diameter of the circle on which the stator outer peripheral surface 402 is located, and the inner diameter of the stator is the diameter of the circle on which the stator inner peripheral surface 403 is located.

For example, the ratio of the axial dimension of the stator 200 to the outer diameter of the stator 200 is 0.16, and the ratio of the inner diameter of the stator 200 to the outer diameter of the stator 200 is 0.52.

Therefore, the performance of the permanent magnet motor is improved.

Optionally, the outer diameter of the stator 200 is 85mm-95 mm. For example, the outer diameter of the stator 200 is 93 mm.

The vehicle provided by the embodiment of the utility model comprises the permanent magnet motor in any embodiment.

The vehicle may be an electric automobile, an electric bicycle, or the like.

Therefore, the vehicle provided by the embodiment of the utility model has the advantages of good performance, good running stability and the like.

Taking a permanent magnet motor for an electric bicycle as an example, the outer diameter of the stator 200 of the permanent magnet motor is 93mm, the aspect ratio of the stator 200 (the ratio of the axial dimension of the stator 200 to the outer diameter of the stator 200) is 0.16, and the split ratio of the stator 200 (the inner diameter of the stator 200 and the outer diameter of the stator 200) is 0.52.

Through experimental tests, the efficiency of the permanent magnet motor at a light load point is 91.7%, the efficiency of the heavy load point is 91.7%, and the rated efficiency is 92.7%.

The magnetic leakage coefficient is represented by the no-load counter electromotive force of the permanent magnet motor, the greater the magnetic leakage coefficient is, the smaller the no-load counter electromotive force of the permanent magnet motor is, and when the inward movement size of the permanent magnet 2 is adjusted by adjusting the thickness of the outer magnetic bridge (the thickness of the outer groove wall 1011 of the accommodating groove 101), the demagnetization rate of the permanent magnet 2 and the counter electromotive force change result of the permanent magnet motor are shown in fig. 5 in a three-phase short circuit state. It can be shown that the demagnetization rate of the permanent magnet 2 is reduced along with the inward movement of the permanent magnet 2, but the back electromotive force of the permanent magnet motor is reduced, which shows that the magnetic leakage coefficient of the permanent magnet motor is increased along with the increase of the thickness of the outer magnetic bridge.

When the rotor 100 of the permanent magnet motor of the embodiment of the present invention is used, the permanent magnet 2 is ensured to move inward by 1.75mm, that is, the relative position is unchanged, the thickness of the outer magnetic bridge is 1mm, the epoxy resin is filled in the middle, and similarly, in the three-phase short circuit state, the demagnetization rate of the permanent magnet 2 and the back electromotive force result of the permanent magnet motor are as shown in fig. 5 to 7. It can be seen that, with the rotor 100 according to the embodiment of the present invention, the demagnetization rate of the permanent magnet 2 of the permanent magnet motor is 0.8%, and the counter potential is increased compared to the counter potential of the old scheme. Therefore, the rotor 100 according to the embodiment of the present invention is described, so that under the condition that the demagnetization resistance of the permanent magnet motor is ensured, the leakage coefficient of the permanent magnet motor is reduced, and the performance of the permanent magnet motor is improved.

In fig. 5 to 7, the inward shift size means: the distance between the outer side surface of the permanent magnet 2 and the outer side surface of the outer groove wall 1011 of the housing groove 101 (the outer side surface of the outer magnetic bridge, the outer peripheral surface of the rotor) in the inner and outer directions; the old protocol refers to: the permanent magnet 2 is moved to the direction adjacent to the rotor axis only by increasing the thickness of the outer magnetic bridge (the outer groove wall 1011 of the accommodating groove 101); the new scheme comprises the following steps: in the present invention, the permanent magnet 2 is moved in the direction close to the rotor axis by forming the spacer 102 between the outer surface of the permanent magnet 2 and the outer groove wall 1011 of the housing groove 101.

The rotor provided by the embodiment of the utility model has good demagnetization resistance, and can reduce the magnetic leakage of the permanent magnet motor with the rotor. Meanwhile, by optimizing the key size of the stator of the permanent magnet motor, the relation between the copper loss and the iron loss of the permanent magnet motor can be effectively balanced, and the breadth efficiency of the permanent magnet motor is improved.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be interconnected within two elements or in a relationship where two elements interact with each other unless otherwise specifically limited. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

In the present disclosure, the terms "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" and the like mean that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims (12)

1. A rotor, comprising:

the rotor comprises a rotor core and a rotor core, wherein the rotor core is provided with a plurality of accommodating grooves which are arranged at intervals along the circumferential direction of the rotor core; and

the permanent magnets correspond to the accommodating grooves one by one, and the permanent magnets are arranged in the corresponding accommodating grooves;

wherein the outer side of the permanent magnet and the outer side groove wall of the accommodating groove are arranged at intervals to form a spacing part.

2. The rotor of claim 1, further comprising a plurality of non-magnetic members, wherein the plurality of non-magnetic members correspond to the plurality of receiving slots one to one, the non-magnetic members are disposed in the spacers of the corresponding receiving slots, outer side surfaces of the non-magnetic members abut against outer side slot walls of the receiving slots, and inner side surfaces of the non-magnetic members abut against outer side surfaces of the permanent magnets.

3. The rotor as claimed in claim 2, wherein the outer side surface of the non-magnetic-conductive member is formed in conformity with the outer groove wall of the receiving groove, and the inner side surface of the non-magnetic-conductive member is formed in conformity with the outer side surface of the permanent magnet.

4. The rotor of claim 2, wherein the non-magnetic conductive member is connected to at least one of an outer groove wall of the receiving groove and a groove side wall of the receiving groove, and the non-magnetic conductive member is connected to the permanent magnet.

5. The rotor as claimed in claim 4, wherein the non-magnetic conductive member is a colloid, the non-magnetic conductive member is bonded to the outer groove wall of the receiving groove and the groove side wall of the receiving groove, and the non-magnetic conductive member is bonded to the permanent magnet.

6. The rotor of claim 2, wherein the non-magnetic conductive member is an epoxy or plastic member.

7. The rotor as claimed in any one of claims 1 to 6, wherein the spacer has a dimension in the inward and outward direction of 0.5mm to 1mm, and the outer groove wall has a dimension in the inward and outward direction of 0.8mm to 1.2 mm.

8. The rotor of any one of claims 1-6, wherein an outer side groove wall of the receiving groove includes a first outer protrusion and a second outer protrusion, the first outer protrusion and the second outer protrusion being arranged at a spacing in a circumferential direction of the rotor core, and an inner side groove wall of the receiving groove includes a first inner protrusion and a second inner protrusion, the first inner protrusion and the second inner protrusion being arranged in an axial direction of the rotor core.

9. The rotor of claim 8, wherein the first outer protrusion and the second outer protrusion are symmetrically disposed about a centerline of the receiving slot, and the first inner protrusion and the second inner protrusion are symmetrically disposed about the centerline of the receiving slot.

10. A permanent magnet electric machine, comprising:

a rotor according to any one of claims 1 to 9; and

a stator having a stator bore, the rotor rotatably disposed within the stator bore.

11. The permanent magnet electric machine according to claim 10, wherein the ratio of the axial dimension of the stator to the outer diameter of the stator is 0.15-0.20, and the ratio of the inner diameter of the stator to the outer diameter of the stator is 0.48-0.57.

12. A vehicle comprising a permanent magnet machine according to claim 10 or 11.

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