CN212726608U

CN212726608U - Rotor punching sheet, rotor core, rotor, motor and vehicle

Info

Publication number: CN212726608U
Application number: CN202021563080.9U
Authority: CN
Inventors: 王飞; 汪盼
Original assignee: Guangdong Welling Auto Parts Co Ltd; Anhui Welling Auto Parts Co Ltd
Current assignee: Guangdong Welling Auto Parts Co Ltd; Anhui Welling Auto Parts Co Ltd
Priority date: 2020-07-31
Filing date: 2020-07-31
Publication date: 2021-03-16
Anticipated expiration: 2030-07-31

Abstract

The utility model provides a rotor punching, rotor core, rotor, motor and vehicle, rotor punching are including towards piece body, shaft hole, a plurality of installation department and air gap groove. Wherein, the shaft hole sets up on the towards piece body. A plurality of installation departments are around the shaft hole setting on the towards piece body, and each installation department includes a plurality of magnet grooves in a plurality of installation departments. The plurality of magnet grooves comprise first magnet grooves, the first magnet grooves are far away from the shaft hole and are arranged on the punching sheet body, the first magnet grooves comprise first straight groove walls far away from the shaft hole, and the planes where the first straight groove walls are located are first end faces. The air gap groove sets up on towards the piece body and lies in first magnet groove and between the outer border towards the piece body, the utility model discloses an in the design through making the air gap trench in one side that first terminal surface deviates from the shaft hole to can guarantee that the air gap groove can also effectively improve the rotor towards the piece magnetic leakage when not influencing the dq axle magnetic circuit of motor, increase the permanent magnet torque of motor, further promote the utilization ratio of permanent magnet.

Description

Rotor punching sheet, rotor core, rotor, motor and vehicle

Technical Field

The utility model relates to an electrical equipment technical field particularly, relates to a rotor punching, a rotor core, a rotor, a motor and a vehicle.

Background

At present, aiming at an interior permanent magnet synchronous motor, the magnetic steel utilization rate is improved in order to improve the phenomena of demagnetization and magnetic flux leakage of magnetic steel of the motor. It is often employed to reduce the width of the magnetic isolation bridge of the rotor of the motor. However, when the motor is in a high-speed working condition, the magnetic isolation bridge of the rotor is stressed greatly, and the narrow magnetic isolation bridge is difficult to meet the structural strength requirement of the rotor at a high speed. Therefore, how to improve the structural strength of the rotor while reducing the magnetic flux leakage is a problem to be solved urgently.

SUMMERY OF THE UTILITY MODEL

The present invention aims at least solving one of the technical problems existing in the prior art or the related art.

Therefore, a first aspect of the present invention is to provide a rotor punching sheet.

A second aspect of the present invention is to provide a rotor core.

A third aspect of the present invention is to provide a rotor.

A fourth aspect of the present invention is to provide an electric motor.

A fifth aspect of the present invention is to provide a vehicle.

In view of this, according to the utility model discloses a first aspect provides a rotor punching sheet, including towards piece body, shaft hole, a plurality of installation department and air gap groove. Wherein, the shaft hole sets up on the towards piece body. A plurality of installation departments are around the shaft hole setting on the towards piece body, and each installation department includes a plurality of magnet grooves in a plurality of installation departments. The plurality of magnet grooves comprise first magnet grooves, the first magnet grooves are far away from the shaft hole and are arranged on the punching sheet body, the first magnet grooves comprise first straight groove walls far away from the shaft hole, and the planes where the first straight groove walls are located are first end faces. The air gap groove is arranged on the punching sheet body and is positioned between the first magnet groove and the outer edge of the punching sheet body, and the air gap groove is positioned on one side of the first end face, which is deviated from the shaft hole.

The utility model provides a rotor punching is including towards piece body, shaft hole, a plurality of installation department and air gap groove. The shaft hole is opened on the towards piece body, and towards the piece body for the magnet steel body. The shaft hole is used for assembling a rotating shaft of the rotor. A plurality of installation portions are arranged on the punching sheet body around the shaft hole. It should be noted that the structure of each of the plurality of mounting portions may be the same or partially the same, and it is sufficient to adjust the same according to actual needs. Each mounting portion includes a plurality of magnet slots for mounting permanent magnets of the rotor. The plurality of magnet grooves comprise first magnet grooves, the first magnet grooves are far away from the shaft hole relative to other magnet grooves and are arranged on the punching sheet body, the first magnet grooves comprise first straight groove walls far away from the shaft hole, and the planes of the first straight groove walls are first end faces. It is worth to be noted that, when the first permanent magnet is assembled in the first magnet groove, the first straight groove wall is a groove wall located on one side of the first permanent magnet, which is far away from the shaft hole. Wherein, a gap is arranged between the first straight groove wall and the first permanent magnet. When the first straight groove wall and the first permanent magnet are provided with a gap, the first permanent magnet can be conveniently installed. The punching sheet body also comprises an air gap groove which is arranged on the punching sheet body, on one hand, the air gap groove is positioned between the first magnet groove and the outer edge of the punching sheet body, on the other hand, the air gap groove can divide part of the punching sheet body positioned between the first magnet groove and the punching sheet body into two magnetic isolation bridges, one of the two magnetic isolation bridges is close to the first magnet groove, the other one of the two magnetic isolation bridges is close to the outer edge of the punching sheet body, the double magnetic isolation bridge structure can improve the mechanical strength of the rotor punching sheet, can optimize the distribution condition of the magnetic field of the rotor, obviously improves the electromagnetic torque of the motor with the rotor punching sheet, effectively improves the magnetic leakage and demagnetization phenomena of permanent magnets positioned in the magnet grooves, disperses the centrifugal stress at the periphery of the magnet grooves of the rotor punching sheet under the working condition of high rotating speed, thereby solving the problem that the mechanical strength of the rotor punching sheet under the high rotating speed is difficult to meet the requirements, in addition, the utilization rate of the permanent magnet and the power density of the motor can be obviously improved, the working performance of the motor is further improved, the torque pulsation of the motor can be weakened to a certain extent, the running noise of the motor is reduced, and the use comfort of a user is improved; on the other hand, the air gap groove is positioned on one side of the first end surface, which is far away from the shaft hole, so that the magnetic leakage of the punching sheet body can be effectively improved, a dq shaft magnetic circuit of the motor is not influenced, and the sufficient permanent magnet torque of the motor is ensured.

In particular, with regard to the air gap groove being located on the side of the first end face facing away from the axle bore, it can also be explained that the minimum vertical spacing Lmin between any point within the air gap groove and the first end face is greater than 0. Therefore, the magnetic flux leakage phenomenon is improved, the dq axis magnetic circuit of the motor is not influenced, and the sufficient reluctance torque of the motor is ensured.

The cross section of the air gap groove is in a closed triangular shape, a quadrangular shape, a polygonal shape or an irregular geometric figure consisting of the triangular shape, the quadrangular shape, the polygonal shape and the circular arc shape. Each installation part comprises two air gap grooves, the two air gap grooves are the same in shape, size and structure and convenient to machine and form.

In one possible design, further, the air gap slot is located between an end of the first magnet slot and an outer edge of the lamination body.

In the design, the air gap groove is positioned between the end part of the first magnet groove and the outer edge of the punching sheet body, and on one hand, a double-magnetic-bridge structure is formed by arranging the air gap groove between the first magnet groove and the outer edge of the punching sheet body, so that the structural stress of the rotor at a high speed can be effectively improved, the deformation quantity of the rotor is reduced, the rotor punching sheet is prevented from being deformed or broken under the action of centrifugal force in a high-speed running state, and the integral structural strength of the rotor punching sheet is enhanced; on the other hand, the air gap groove is arranged between the end part of the first magnet groove and the outer edge of the punching sheet body, namely the first air gap groove is arranged at the end part of the first magnet groove with larger magnetic leakage, so that the end part magnetic leakage of the permanent magnet arranged in the first magnet groove can be effectively reduced, and the utilization rate of the permanent magnet is further improved.

In a possible design, further, the punching sheet body comprises a first magnetism isolating bridge, the first magnetism isolating bridge is located between the air gap groove and the first magnet groove, the first magnetism isolating bridge is provided with a first magnetism isolating end and a second magnetism isolating end which are opposite, and the width of the first magnetism isolating end is different from that of the second magnetism isolating end.

In the design, a part of the punching sheet body between the air gap groove and the first magnet groove is a first magnetism isolating bridge, the first magnetism isolating bridge is provided with a first magnetism isolating end and a second magnetism isolating end which are deviated from each other, the width of the first magnetism isolating end is different from that of the second magnetism isolating end, namely the width of each position on the first magnetism isolating bridge is not all equal, one end part of the first magnetism isolating bridge can reach saturation to limit magnetic leakage, the other end part of the first magnetism isolating bridge can play a role in dispersing punching sheet stress, and the sufficient mechanical strength of the rotor punching sheet is ensured.

In a possible design, further, the number of the air gap grooves is two, the two air gap grooves are respectively arranged at two ends of the first magnet groove, a part of the punching sheet body between the two air gap grooves and the first magnet groove is a first body, the first magnetism isolating end is arranged between the second magnetism isolating end and the first body, and the width of the second magnetism isolating end is larger than that of the first magnetism isolating end and is less than or equal to 4 times of that of the first magnetism isolating end.

In this design, the number of air gap grooves is two, and the two air gap grooves are respectively provided at both ends of the first magnet groove. The punching sheet body further comprises a first body, the first body is located between the two air gap grooves and the first magnet groove, and namely the first body is located on one side, away from the shaft hole, of the first magnet groove. The first magnetism isolating end is located between the second magnetism isolating end and the first body, namely, the first magnetism isolating end is close to the first body, and the second magnetism isolating end is far away from the first body, wherein the width of the first magnetism isolating end is smaller than that of the second magnetism isolating end, namely, the first magnetism isolating bridge is integrally narrow at the top and wide at the bottom, and is similar to a trapezoid. When magnetic flux passes through the first magnetism isolating end of the first magnetism isolating bridge, the first magnetism isolating end which is narrower is saturated, so that magnetic flux leakage can be limited, and the second magnetism isolating end which is wider fully plays a role in dispersing punching sheet profit and protecting sufficient mechanical strength of the rotor punching sheet. Further, the width of the second magnetism isolating end is larger than that of the first magnetism isolating end and is less than or equal to 4 times of that of the first magnetism isolating end, specifically, the width of the second magnetism isolating end is t2, the width of the first magnetism isolating end is t1, wherein t2 is larger than or equal to k × t1, and k belongs to (1, 4). When the width t1 of the first magnetism isolating end and the width t2 of the second magnetism isolating end satisfy the relationship, the size of the first magnetism isolating bridge is favorably and reasonably distributed, and therefore the structural strength and the magnetic leakage phenomenon of the rotor punching sheet can be improved. It is noted that k is in the range of 1 to 4, for example, k may be 1.5, 1.8, 2.6, 3.4, 3.7.

In a possible design, further, the width of the first magnetism isolating end is larger than or equal to the thickness of the punching sheet body.

In the design, the width t1 of the first magnetism isolating end is larger than or equal to the thickness of the punching sheet body, the minimum width of the first magnetism isolating bridge is larger than the thickness of the rotor punching sheet, so that the situation that any part of the first magnetism isolating bridge in a trapezoid shape is too thin and broken can be prevented, the strength of the rotor punching sheet is improved, and the use reliability of the rotor punching sheet is improved.

In one possible design, the first magnet slot further comprises an intermediate section for accommodating the permanent magnets of the rotor and an extension section. The extension section is arranged at the end of the middle section and communicated with the middle section.

In this design, the first magnet slot comprises an intermediate section for accommodating the permanent magnets of the rotor and an extension section, the intermediate section comprising a first straight slot wall. The extension section sets up the both ends at the interlude, and the extension section is linked together with the interlude, and the permanent magnet does not set up in the extension section. That is, when the permanent magnet is inserted into the first magnet groove, the permanent magnet can only be filled in the middle section of the first magnet groove, and air is filled in the extension section of the first magnet groove, and at the moment, the extension section can inhibit the end magnetic flux leakage phenomenon of the permanent magnet.

In one possible design, further, the minimum distance between two air gap slots is d 1; the width of the middle section is w 1;the quantity of extension is two, and two extension are connected respectively at the both ends of interlude, and the maximum distance between two extensions is w2, wherein:

in this design, the minimum distance between the two air gap slots, which are the two air gap slots located at the ends of the first magnet slot, is d 1. The width of interlude is w1, sets up the permanent magnet in the interlude, and the width of interlude is equal with the width of permanent magnet, and then the width of interlude is also equal with the width of permanent magnet. The number of the extension sections is two, the two extension sections are respectively connected to two ends of the middle section, and the maximum distance between the two extension sections is w2, wherein when the minimum distance d1 between the two air gap grooves, the width of the middle section (permanent magnet) is w1, and the maximum distance w2 between the two extension sections satisfy the above relation, the distribution of magnetic fields can be more uniform under the condition that the main magnetic circuit of the rotor sheet is not influenced by the air gap grooves, the waveform of electromagnetic torque is more regular, so that the torque pulsation of the motor can be reduced, and the electromagnetic torque of the motor can be reduced due to the fact that the equivalent magnetic resistance of the magnetic circuit is too large because the air gap grooves are too large.

In one possible design, further, an included angle formed by connecting centers of the two air gap grooves and a center of the shaft hole is theta, the outer peripheral radius of the punching sheet body is r, and the maximum value of the radial width of the first body is h1, wherein:

in the design, the cross section of the air gap groove is in a geometric figure and/or a non-geometric figure, and when the cross section of the air gap groove is in the geometric figure, the center of the air gap groove is the center of the geometric figure. When the cross section of the air gap groove is in a non-geometric figure, the center of the air gap groove is taken as the center of the intersection point of the connecting line of two points which are farthest away from the circumferential direction and the connecting line of two points which are farthest away from the radial direction. The two air gap grooves comprise a first air gap groove and a second air gap groove, the center of the first air gap groove is a first center, the center of the second air gap groove is a second center, the center of the shaft hole is an axis, and an included angle formed by the first center, the second center and the axis is theta. The value of θ may be indicative of the relative size and location of any of the air gap slots disposed at the end portion within any of the mounting portions. The concrete expression is as follows: the larger theta is, the larger the air gap slot is, and the better the improvement effect on the magnetic flux leakage at the end part of the motor is; the smaller θ is, the smaller the air gap slot is, and the worse the improvement effect on the motor leakage flux is. When the included angle theta, the width w1 of the middle section, the maximum distance w2 between the two extension sections and the peripheral radius of the stamped sheet body are r, and the maximum value h1 of the radial width of the first body meets the relation, the position and the size of the air gap groove are relatively better, so that the magnetic field distribution can be effectively adjusted under the condition that the mechanical strength of the rotor stamped sheet is excellent, the magnetic leakage and demagnetization of the permanent magnet are improved, and the torque pulsation of the motor is reduced. Meanwhile, the phenomenon that the equivalent magnetic resistance of a magnetic circuit is too large due to too large air gap grooves can be prevented, and the electromagnetic torque of the motor is reduced.

Specifically, let

X is in the range of 1 to 1.3, and further, x may be 1.05, 1.1, 1.15, 1.2, 1.25, etc.

In one possible design, the first magnetic shield bridge has a bridge edge adjacent to the air gap slot, the bridge edge having a length L1, wherein:

in the design, the first magnetic bridge is provided with a magnetic bridge edge close to the air gap groove, and the length L1 of the magnetic bridge edge meets the relational expression, so that the distribution of a magnetic field is more uniform and the waveform of electromagnetic torque is more regular under the condition that the main magnetic path of a rotor punching sheet is not influenced by the air gap groove, the torque pulsation of the motor can be favorably reduced, and the electromagnetic torque of the motor can be reduced due to overlarge equivalent magnetic resistance of the magnetic path caused by overlarge air gap groove. The first magnetic bridge is also provided with a magnetic isolation edge close to the first magnet groove, and the lengths of the magnetic bridge edge and the magnetic isolation edge can be equal or not, and the magnetic bridge edge and the magnetic isolation edge can be adjusted according to actual conditions.

In a possible design, further, the punching sheet body further comprises a second magnetic isolation bridge, and the second magnetic isolation bridge is located between the air gap groove and the outer edge of the punching sheet body. The width h of the second magnetism isolating bridge is larger than or equal to the thickness of the punching sheet body.

In the design, the second magnetic isolation bridge is positioned between the air gap groove and the outer edge of the punching sheet body. Specifically, the second magnetic isolation bridge is an arc-shaped magnetic isolation bridge. The minimum width of the second magnetic isolation bridge is larger than or equal to the thickness of the rotor punching sheet, so that the outer peripheral edge part of the rotor punching sheet can be prevented from being too thin and easily broken, the strength of the rotor punching sheet can be improved, and the use reliability of the rotor is improved. It should be noted that, when the second magnetic isolation bridge is an equal-width magnetic isolation bridge, the width of the second magnetic isolation bridge is the average width of the second magnetic isolation bridge. When the second magnetic isolation bridge is a magnetic isolation bridge with different widths, the width of the second magnetic isolation bridge refers to the minimum width.

In one possible design, the width h of the second magnetic isolating bridge is smaller than the width t1 of the first magnetic isolating end.

In the design, the width h of the second magnetic isolation bridge is smaller than the width t1 of the first magnetic isolation end, and due to the double-magnetic-bridge structure obtained by adopting the air gap groove, the structural stress of any magnetic bridge section on the first magnetic isolation bridge is larger than that of the second magnetic isolation bridge. The first magnetism isolating end of the first magnetism isolating bridge is smaller than the second magnetism isolating end, the width t1 of the first magnetism isolating end meets the requirement of structural strength, and the structural strength of the second magnetism isolating bridge can meet the requirement of structural strength necessarily. The width h of the second magnetic isolation bridge is smaller than the width t1 of the first magnetic isolation end, so that the second magnetic isolation bridge is narrow, end magnetic flux leakage can be further inhibited, and the utilization rate of the permanent magnet is improved.

In a possible design, further, the plurality of magnet grooves further include two second magnet grooves, the two second magnet grooves are arranged on the punching sheet body, each of the two second magnet grooves respectively has an inner end close to the shaft hole and an outer end far away from the shaft hole, the two inner ends are close to each other, the two outer ends are far away from each other, and the first magnet groove is arranged between the two outer ends.

In this design, a plurality of magnet grooves include two second magnet grooves, and two second magnet grooves set up on the towards piece body, and each second magnet groove has the inner that is close to the shaft hole, keeps away from the outer end in shaft hole, and two inner are close to each other, and two outer ends are kept away from each other, and two second magnet grooves are the V type promptly and arrange on the towards piece body. Further, at least one part of the first magnet groove is located between the two outer ends, and the three magnet grooves are arranged on the punching sheet body in a triangle-like shape. It is worth mentioning that one mounting portion includes three magnet grooves.

According to the utility model discloses a second aspect provides a rotor core, the rotor punching that provides including the arbitrary design of above-mentioned.

The utility model provides a rotor core, including the rotor punching that any above-mentioned design provided, consequently have this rotor punching's whole beneficial effect, no longer give consideration to here.

According to a third aspect of the present invention, there is provided a rotor, comprising a rotor core of any of the above designs.

The utility model provides a rotor, including the rotor core that any above-mentioned design provided, consequently have this rotor core's whole beneficial effect, no longer give consideration to here.

Further, the magnet slots of the plurality of rotor sheets of the rotor core penetrate along the axial direction of the rotor core to form slots. The rotor further comprises a plurality of permanent magnets, and the permanent magnets are arranged in the slots in a one-to-one correspondence mode.

In a possible design, further, the plurality of slots include a first slot, the first magnet slots of the plurality of rotor laminations form the first slot, and the middle section of the first magnet slot forms a middle slot of the slot. The plurality of permanent magnets comprise first permanent magnets, the first permanent magnets are inserted in the middle grooves, and the width of the first permanent magnets is equal to that of the middle grooves.

In the design, the first magnet grooves of the multiple rotor punching sheets are stacked to form a first slot, and the middle section of the first slot forms an intermediate slot. The first permanent magnet is inserted in the middle groove, and the width of the first permanent magnet is equal to that of the middle groove. A gap is reserved between the first permanent magnet and the first straight groove wall of the middle groove, so that assembly is facilitated.

According to a fourth aspect of the present invention, there is provided an electric machine comprising a rotor as provided by any of the above designs.

The utility model provides a motor, including the rotor that any above-mentioned design provided, consequently have the whole beneficial effect of this rotor, no longer describe herein.

Further, the motor further includes a stator configured to form an assembly cavity, the rotor disposed within the assembly cavity, the rotor being rotatable relative to the stator.

According to a fifth aspect of the present invention, there is provided a vehicle comprising an electric machine provided by any of the above designs.

The utility model discloses a vehicle that provides in design, including the motor that any above-mentioned design provided, consequently have all beneficial effects of this motor, no longer describe herein.

It is worth mentioning that the vehicle may be a new energy automobile. 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 design can be used as a driving motor of a vehicle. In particular, the drive motor alone enables the functional device of the vehicle to be started. Alternatively, the driving motor can cooperate with other driving devices on the vehicle to realize the normal operation of functional devices on the vehicle. The functional device of the vehicle can be any one or any combination of the following: wheels, air conditioners, light assemblies, etc.

In one possible design, further, the vehicle includes a vehicle body, and the motor is mounted in the vehicle body.

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

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 shows a schematic structural view of a rotor sheet according to an embodiment of the present invention;

fig. 2 shows a partial enlarged view of a rotor sheet at a in an embodiment of the present invention shown in fig. 1;

fig. 3 shows a partial enlarged view of a rotor sheet at B in an embodiment of the present invention shown in fig. 2;

fig. 4 shows a partial enlarged view of the rotor sheet at C in an embodiment of the present invention shown in fig. 2;

fig. 5 shows a schematic structural view of a rotor sheet according to another embodiment of the present invention;

fig. 6 shows a partial enlarged view of the rotor sheet at D in the embodiment of the present invention shown in fig. 5;

fig. 7 is a torque waveform comparison diagram of a rotor sheet in an embodiment according to the present invention and a rotor sheet in a related art;

FIG. 8 illustrates a torque graph for different slot positions in a rotor sheet according to an embodiment of the present invention;

fig. 9 shows a torque ripple curve diagram for different positions of air gap slots in a rotor sheet according to an embodiment of the present invention.

Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 6 is:

1, punching a rotor sheet,

10, punching a sheet body, wherein the punching sheet body,

101a first magnetic isolation bridge, 101a first magnetic isolation end, 101b a second magnetic isolation end, 101c magnetic bridge side, 102 a second magnetic isolation bridge,

103 of the first body, a first body,

11 the shaft hole is arranged on the upper portion of the shaft,

12, a mounting portion, 120 magnet slots,

121a first magnet slot, 121a first straight slot wall, 121b middle segment, 121c extension segment, 122 second magnet slot,

13 the air gap groove is arranged on the upper surface of the shell,

20 permanent magnet, 20a first permanent magnet.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention more clearly understood, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.

Rotor sheets, rotor cores, rotors, motors, and vehicles provided according to some embodiments of the present invention are described below with reference to fig. 1 to 6.

Example one

According to a first aspect of the present invention, a rotor punching sheet 1 is provided, as shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 6, including a punching sheet body 10, a shaft hole 11, a plurality of mounting portions 12 and an air gap groove 13. Wherein, the shaft hole 11 is arranged on the punching sheet body 10. A plurality of mounting portions 12 are provided on the die body 10 around the shaft hole 11, and each of the plurality of mounting portions 12 includes a plurality of magnet grooves 120. The plurality of magnet slots 120 include a first magnet slot 121, the first magnet slot 121 is arranged on the punching sheet body 10 away from the shaft hole 11, the first magnet slot 121 includes a first straight slot wall 121a away from the shaft hole 11, and a plane where the first straight slot wall 121a is located is a first end surface. The air gap groove 13 is arranged on the punching sheet body 10 and is located between the first magnet groove 121 and the outer edge of the punching sheet body 10, and the air gap groove 13 is located on one side of the first end face, which is far away from the shaft hole 11.

The utility model provides a rotor punching 1 is including punching sheet body 10, shaft hole 11, a plurality of installation department 12 and air gap groove 13. The shaft hole 11 is opened on punching the piece body 10, and punching the piece body 10 for the magnet steel body. The shaft hole 11 is used for assembling a rotating shaft of the rotor. A plurality of mounting portions 12 are provided on the punch body 10 around the shaft hole 11. It should be noted that the structure of each of the plurality of mounting portions 12 may be the same or partially the same, and it is sufficient to adjust the structure according to actual needs. Each mounting portion 12 includes a plurality of magnet slots 120, the magnet slots 120 being for mounting the permanent magnets 20 of the rotor. The plurality of magnet grooves 120 include a first magnet groove 121, the first magnet groove 121 is arranged on the punching sheet body 10 away from the shaft hole 11 relative to the other magnet grooves 120, the first magnet groove 121 includes a first straight groove wall 121a away from the shaft hole 11, and a plane of the first straight groove wall 121a is a first end face. It should be noted that, when the first permanent magnet 20a is assembled in the first magnet groove 121, the first straight groove wall 121a is a groove wall located on a side of the first permanent magnet 20a away from the shaft hole 11. Wherein a gap is provided between the first straight slot wall 121a and the first permanent magnet 20 a. The installation of the first permanent magnet 20a may be facilitated when the first straight groove wall 121a has a gap with the first permanent magnet 20 a. The punching sheet body 10 further comprises an air gap groove 13, the air gap groove 13 is arranged on the punching sheet body 10, on one hand, the air gap groove 13 is positioned between the first magnet groove 121 and the outer edge of the punching sheet body 10, on the other hand, the air gap groove 13 can divide part of the punching sheet body 10 positioned between the first magnet groove 121 and the punching sheet body 10 into two magnetic isolation bridges, one of the two magnetic isolation bridges is close to the first magnet groove 121, the other of the two magnetic isolation bridges is close to the outer edge of the punching sheet body 10, the double magnetic isolation bridge structure can improve the mechanical strength of the rotor punching sheet 1, can optimize the distribution condition of a rotor magnetic field, obviously improves the electromagnetic torque of a motor with the rotor punching sheet 1, effectively improves the phenomena of magnetic leakage and demagnetization of permanent magnets 20 positioned in the magnet grooves 120, disperses the centrifugal stress around the magnet grooves 120 when the rotor punching sheet 1 is under the high-speed working condition, and therefore, solves the problem that the mechanical strength of the rotor punching sheet, the design of the motor with low magnetic leakage and high strength is realized, in addition, the utilization rate of the permanent magnet 20 and the power density of the motor can be obviously improved, the working performance of the motor is further improved, meanwhile, the torque pulsation of the motor can be weakened to a certain extent, the running noise of the motor is reduced, and the use comfort of a user is improved; on the other hand, the air gap groove 13 is located on one side of the first end face, which is far away from the shaft hole 11, so that the air gap groove 13 can effectively improve the magnetic leakage of the punching sheet body 10, meanwhile, the dq-axis magnetic circuit of the motor is not influenced, and the sufficient reluctance torque of the motor is ensured.

A large amount of experimental data show that, as shown in fig. 7, under the test condition that other structures of the rotor sheet 1 are the same, the first structure of the rotor sheet 1: the punching sheet body 10 is not provided with an air gap groove 13, and the rotor punching sheet 1 has a second structure: the punching sheet body 10 is provided with an air gap groove 13. As can be seen by comparison, when the air gap groove 13 is provided in the rotor segment 1, the electromagnetic torque of the motor increases, and the motor torque ripple also decreases to some extent.

In particular, as shown in fig. 4, with respect to the air gap groove 13 being located on the side of the first end surface facing away from the axle hole 11, it can also be explained that the minimum vertical spacing Lmin between any point within the air gap groove 13 and the first end surface is greater than 0. Therefore, the magnetic flux leakage phenomenon is improved, the dq axis magnetic circuit of the motor is not influenced, and the sufficient reluctance torque of the motor is ensured.

As shown in fig. 2, 3, 4 and 6, the cross section of the air gap groove 13 is a closed triangle, a quadrangle, a polygon or an irregular geometric figure formed by a triangle, a quadrangle, a polygon and a circular arc. Each mounting portion 12 comprises two air gap grooves 13, and the two air gap grooves 13 are identical in shape, size and structure and convenient to machine and form.

Further, the air gap groove 13 is located between the end of the first magnet groove 121 and the outer edge of the punching sheet body 10.

In this embodiment, as shown in fig. 1, 5 and 6, the air gap groove 13 is located between the end of the first magnet groove 121 and the outer edge of the punching sheet body 10, and on one hand, the air gap groove 13 is arranged between the first magnet groove 121 and the outer edge of the punching sheet body 10 to form a double magnetic bridge structure, so that the structural stress of the rotor at high speed can be effectively improved, the deformation quantity of the rotor is reduced, the rotor sheet 1 is prevented from being deformed or broken by the action of centrifugal force in a high-speed operation state, and the structural strength of the whole rotor sheet 1 is enhanced; on the other hand, the air gap groove 13 is arranged between the end of the first magnet groove 121 and the outer edge of the punching sheet body 10, that is, the first air gap groove 13 is arranged at the end of the first magnet groove 121 with large magnetic leakage, so that the magnetic leakage at the end of the permanent magnet 20 arranged in the first magnet groove 121 can be reduced, and the utilization rate of the permanent magnet 20 is further improved.

Further, as shown in fig. 2 and fig. 3, the punching sheet body 10 includes a first magnetism isolating bridge 101, the first magnetism isolating bridge 101 is located between the air gap groove 13 and the first magnet groove 121, the first magnetism isolating bridge 101 has a first magnetism isolating end 101a and a second magnetism isolating end 101b which are opposite, and the width of the first magnetism isolating end 101a is different from that of the second magnetism isolating end 101 b.

In this embodiment, a part of the punching sheet body 10 located between the air gap groove 13 and the first magnet groove 121 is a first magnetic isolation bridge 101, the first magnetic isolation bridge 101 has a first magnetic isolation end 101a and a second magnetic isolation end 101b which are away from each other, and the width of the first magnetic isolation end 101a is different from that of the second magnetic isolation end 101b, that is, the width of each position on the first magnetic isolation bridge 101 is not all equal, one end of the first magnetic isolation bridge 101 can be saturated to limit magnetic leakage, and the other end of the first magnetic isolation bridge 101 can play a role in dispersing punching sheet stress, so as to ensure sufficient mechanical strength of the rotor punching sheet 1.

Further, as shown in fig. 1, 2, 5, and 6, the number of the air gap grooves 13 is two, the two air gap grooves 13 are respectively disposed at two ends of the first magnet groove 121, a part of the punching sheet body 10 located between the two air gap grooves 13 and the first magnet groove 121 is the first body 103, the first magnetism isolating end 101a is located between the second magnetism isolating end 101b and the first body 103, and the width of the second magnetism isolating end 101b is greater than the width of the first magnetism isolating end 101a and is less than or equal to 4 times the width of the first magnetism isolating end 101 a.

In this embodiment, the number of the air gap grooves 13 is two, and two air gap grooves 13 are respectively provided at both ends of the first magnet groove 121. The punching sheet body 10 further comprises a first body 103, and the first body 103 is located between the two air gap grooves 13 and the first magnet groove 121, that is, the first body 103 is located on one side of the first magnet groove 121, which is away from the shaft hole 11. The first magnetism isolating end 101a is located between the second magnetism isolating end 101b and the first body 103, that is, the first magnetism isolating end 101a is close to the first body 103, and the second magnetism isolating end 101b is far away from the first body 103, wherein the width of the first magnetism isolating end 101a is smaller than that of the second magnetism isolating end 101b, that is, the first magnetism isolating bridge 101 is overall in a shape of being narrow at the top and wide at the bottom, and is similar to a trapezoid. When magnetic flux passes through the first magnetism isolating end 101a of the first magnetism isolating bridge 101, the first magnetism isolating end 101a with a narrower width is saturated, so that magnetic leakage can be limited, and the second magnetism isolating end 101b with a wider width fully plays a role in dispersing punching sheet profit and protecting sufficient mechanical strength of the rotor lamination 1. Further, the width of the second magnetism isolating terminal 101b is greater than the width of the first magnetism isolating terminal 101a and is less than or equal to 4 times of the width of the first magnetism isolating terminal 101a, specifically, the width of the second magnetism isolating terminal 101b is t2, the width of the first magnetism isolating terminal 101a is t1, wherein t2 is not less than k × t1, and k ∈ (1, 4). When the width t1 of the first magnetism isolating end 101a and the width t2 of the second magnetism isolating end 101b satisfy the above relationship, the size of the first magnetism isolating bridge 101 is favorably and reasonably distributed, so that the structural strength and the magnetic leakage phenomenon of the rotor sheet 1 can be improved. It is noted that k is in the range of 1 to 4, for example, k may be 1.5, 1.8, 2.6, 3.4, 3.7.

Further, the width of the first magnetism isolating end 101a is greater than or equal to the thickness of the punching sheet body 10.

In this embodiment, the width t1 of the first magnetism isolating end 101a is greater than or equal to the thickness of the punching sheet body 10, and the minimum width of the first magnetism isolating bridge 101 is greater than the thickness of the rotor punching sheet 1, so that it is possible to prevent any part of the trapezoidal first magnetism isolating bridge 101 from being too thin and breaking, thereby improving the strength of the rotor punching sheet 1 and improving the use reliability of the rotor punching sheet 1.

Further, as shown in fig. 3, the first magnet groove 121 includes an intermediate section 121b and an extended section 121c, and the intermediate section 121b is used to accommodate the permanent magnet 20 of the rotor. The extension section 121c is provided at an end of the intermediate section 121b and communicates with the intermediate section 121 b.

In this embodiment, the first magnet slot 121 includes an intermediate section 121b and an extension section 121c, the intermediate section 121b is for accommodating the permanent magnet 20 of the rotor, and the intermediate section 121b includes a first straight slot wall 121 a. The extension sections 121c are disposed at both ends of the middle section 121b, the extension sections 121c communicate with the middle section 121b, and the permanent magnet 20 is not disposed in the extension sections 121 c. That is, when the permanent magnet 20 is inserted into the first magnet groove 121, the permanent magnet 20 can be filled only in the middle section 121b of the first magnet groove 121 and air is filled in the extension section 121c of the first magnet groove 121, and at this time, the extension section 121c can suppress the end portion of the permanent magnet 20 from leaking magnetic.

Further, as shown in fig. 2, the minimum distance between the two air gap grooves 13 is d 1; intermediate section 121b has a width w 1; the number of the extension sections 121c is two, the two extension sections 121c are respectively connected to two ends of the middle section 121b, and the maximum distance between the two extension sections 121c is w2, wherein:

in this embodiment, the minimum distance between the two air gap grooves 13 is d1, and the two air gap grooves 13 refer to the two air gap grooves 13 located at both ends of the first magnet groove 121. The width of the middle section 121b is w1, the permanent magnet 20 is arranged in the middle section 121b, the width of the middle section 121b is equal to the width of the permanent magnet 20, and the width of the middle section 121b is also equal to the width of the permanent magnet 20. The number of the extension sections 121c is two, the two extension sections 121c are respectively connected to two ends of the middle section 121b, and the maximum distance between the two extension sections 121c is w2, wherein when the minimum distance d1 between the two air gap slots 13, the width of the middle section 121b (the permanent magnet 20) is w1, and the maximum distance w2 between the two extension sections 121c satisfy the above relationship, the air gap slots 13 can make the distribution of the magnetic field more uniform and the electromagnetic torque waveform more regular without affecting the main magnetic circuit of the rotor sheet 1, thereby being beneficial to reducing the torque pulsation of the motor, and simultaneously preventing the air gap slots 13 from being too large to cause the equivalent magnetic resistance of the magnetic circuit to be too large to reduce the electromagnetic torque of the motor.

Further, as shown in fig. 1, 2, 8 and 9, an included angle formed by connecting the centers of the two air gap grooves 13 and the center of the shaft hole 11 is θ, the outer peripheral radius of the punching sheet body 10 is r, and the maximum value of the radial width of the first body 103 is h1, wherein:

in this embodiment, the cross section of the air gap groove 13 is geometric and/or non-geometric, and when the cross section of the air gap groove 13 is geometric, the center of the air gap groove 13 is the center of the geometric figure. When the cross section of the air gap groove 13 is in a non-geometric figure, the center of the air gap groove 13 is the intersection point of the connecting line of the two points which are farthest away from each other in the circumferential direction and the connecting line of the two points which are farthest away from each other in the radial direction. The two air gap grooves 13 comprise a first air gap groove 13 and a second air gap groove 13, the center of the first air gap groove 13 is a first center, the center of the second air gap groove 13 is a second center, the center of the shaft hole 11 is an axis, and an included angle formed by the first center, the second center and the axis is theta. The value of θ may be indicative of the relative size and position of any of the air gap slots 13 disposed at the ends within any of the mounting portions 12. The concrete expression is as follows: the larger theta is, the larger the air gap slot 13 is, and the better the improvement effect on the magnetic flux leakage at the end part of the motor is; the smaller θ is, the smaller the air gap groove 13 is, and the less the improvement effect on the motor leakage flux is. When the included angle θ, the width w1 of the middle section 121b, the maximum distance w2 between the two extending sections 121c, and the peripheral radius of the punching sheet body 10 are r, and the maximum value h1 of the radial width of the first body 103 satisfies the above relationship, the position and size of the air gap groove 13 can be relatively more excellent, so that the magnetic field distribution can be effectively adjusted, the magnetic leakage and demagnetization of the permanent magnet 20 can be improved, and the torque ripple of the motor can be reduced under the condition that the mechanical strength of the rotor punching sheet 1 is excellent. Meanwhile, the phenomenon that the equivalent magnetic resistance of a magnetic circuit is too large due to the fact that the air gap groove 13 is too large can be prevented, and the electromagnetic torque of the motor is reduced.

Specifically, let

X is in the range of 1 to 1.3, and further, x may be 1.05, 1.1, 1.15, 1.2, 1.25, etc. As shown in fig. 8 and 9, when other structures on the rotor lamination 1 are determined, for example, the width w1 of the middle section 121b of the first magnet groove 121, the maximum distance w2 between the two extending sections 121c, and the radius r of the outer periphery of the lamination body 10 are all constant, the angle θ is adjusted by changing the positions of the two air gap grooves 13 so that x is in the range of 1 to 1.3, thereby preventing the torque of the motor from being reduced, and simultaneously, when the outer periphery of the lamination body 10 is adjusted to be rThe motor torque ripple is reduced. As shown in fig. 8, when x is in the range of 1 to 1.3, the torque of the motor is large and stabilizes at 320Nm or more. As shown in fig. 9, the torque ripple of the motor at this time is low, less than 9%.

Further, as shown in fig. 2 and 3, the first magnetic shield bridge 101 has a bridge side 101c near the air gap groove 13, the length of the bridge side 101c is L1, wherein:

in this embodiment, the first magnetic bridge has a magnetic bridge side 101c close to the air gap slot 13, and the length L1 of the magnetic bridge side 101c satisfies the above relation, so that the air gap slot 13 can make the distribution of the magnetic field more uniform and the electromagnetic torque waveform more regular without affecting the main magnetic circuit of the rotor sheet 1, thereby being beneficial to reducing the torque ripple of the motor, and simultaneously preventing the electromagnetic torque of the motor from being reduced due to the excessive equivalent magnetic resistance of the magnetic circuit caused by the excessive air gap slot 13. The first magnetic bridge further has a magnetic isolation edge close to the first magnet slot 121, and the lengths of the magnetic bridge edge 101c and the magnetic isolation edge may be equal or not, and may be adjusted according to actual conditions.

Further, as shown in fig. 2 and fig. 3, the punching sheet body 10 further includes a second magnetic isolation bridge 102, and the second magnetic isolation bridge 102 is located between the air gap groove 13 and the outer edge of the punching sheet body 10. The width h of the second magnetic isolation bridge 102 is greater than or equal to the thickness of the punching sheet body 10.

In this embodiment, the second magnetic isolation bridge 102 is located between the air gap groove 13 and the outer edge of the punching sheet body 10. Specifically, the second magnetic isolation bridge 102 is an arc-shaped magnetic isolation bridge. The minimum width of the second magnetic isolation bridge 102 is greater than or equal to the thickness of the rotor sheet 1, so that the outer peripheral edge part of the rotor sheet 1 can be prevented from being too thin and easily broken, the strength of the rotor sheet 1 can be improved, and the use reliability of the rotor can be improved. It should be noted that, when the second magnetic isolation bridge 102 is an equal-width magnetic isolation bridge, the width of the second magnetic isolation bridge 102 is the average width of the second magnetic isolation bridge 102. When the second magnetic isolation bridge 102 is a magnetic isolation bridge with different widths, the width of the second magnetic isolation bridge 102 refers to the minimum width.

Further, as shown in fig. 3, the width h of the second magnetic shield bridge 102 is smaller than the width t1 of the first magnetic shield end 101 a.

In this embodiment, the width h of the second magnetic isolation bridge 102 is smaller than the width t1 of the first magnetic isolation end 101a, and the structural stress of any magnetic bridge segment on the first magnetic isolation bridge 101 is larger than that of the second magnetic isolation bridge 102 due to the dual magnetic bridge structure obtained by using the air gap groove 13. The first magnetism isolating end 101a of the first magnetism isolating bridge 101 is smaller than the second magnetism isolating end 101b, the width t1 of the first magnetism isolating end 101a meets the structural strength requirement, and the structural strength of the second magnetism isolating bridge 102 can meet the structural strength requirement. The width h of the second magnetic isolation bridge 102 is made smaller than the width t1 of the first magnetic isolation end 101a, so that the second magnetic isolation bridge 102 can be made narrower, end leakage flux can be further suppressed, and the utilization rate of the permanent magnet 20 can be improved.

Example two

Unlike the previous embodiment, in the present embodiment, the other magnet grooves 120 in the mounting portion 12 are explained, and further, as shown in fig. 1 and 5, the plurality of magnet grooves 120 further includes two second magnet grooves 122, the two second magnet grooves 122 are disposed on the punch body 10, each of the two second magnet grooves 122 has an inner end close to the shaft hole 11 and an outer end far from the shaft hole 11, the two inner ends are close to each other, the two outer ends are far from each other, and the first magnet groove 121 is disposed between the two outer ends.

In this embodiment, the plurality of magnet slots 120 includes two second magnet slots 122, the two second magnet slots 122 are disposed on the punching sheet body 10, each second magnet slot 122 has an inner end close to the shaft hole 11 and an outer end far from the shaft hole 11, the two inner ends are close to each other and the two outer ends are far from each other, that is, the two second magnet slots 122 are arranged on the punching sheet body 10 in a V shape. Further, at least a part of the first magnet groove 121 is located between the two outer ends, and the three magnet grooves 120 are arranged on the punching sheet body 10 in a triangle-like shape. It is worth noting that one mounting portion 12 includes three magnet slots 120.

Further, the rotor punching sheet 1 further comprises a magnetic isolation groove which is formed on the punching sheet body 10 and is located between the two near ends. The magnetism isolating body can be arranged in the magnetism isolating groove, so that the structural strength is further improved, and the phenomena of magnetic flux leakage and demagnetization are reduced. The magnetic isolation body can be made of non-magnetic conductive material. Such as: injection molded materials, metallic materials, and the like.

EXAMPLE III

According to the utility model discloses a second aspect provides a rotor core, rotor punching 1 that includes the provided of any above-mentioned embodiment.

The utility model provides a rotor core, including the rotor punching 1 that any above-mentioned embodiment provided, consequently have this rotor punching 1's whole beneficial effect, no longer describe herein.

Example four

According to a third aspect of the present invention, there is provided a rotor including the rotor core in any one of the above embodiments.

The utility model provides a rotor, including the rotor core that any above-mentioned embodiment provided, consequently have this rotor core's whole beneficial effect, no longer describe herein.

Further, the magnet slots 120 of the plurality of rotor laminations 1 of the rotor core penetrate in the axial direction of the rotor core to form slots. The rotor further includes a plurality of permanent magnets 20, and the plurality of permanent magnets 20 are disposed in the plurality of slots in a one-to-one correspondence.

Further, the plurality of slots include a first slot, the first magnet slots 121 of the plurality of rotor sheets 1 form the first slot, and the middle sections 121b of the first magnet slots 121 form middle slots of the slot. The plurality of permanent magnets 20 include a first permanent magnet 20a, the first permanent magnet 20a being inserted in the middle slot, and a width of the first permanent magnet 20a being equal to a width of the middle slot.

In this embodiment, the first magnet grooves 121 of the plurality of rotor sheets 1 are stacked to form a first slot, and the middle section 121b of the first slot forms an intermediate slot. The first permanent magnet 20a is inserted into the middle slot, and the width of the first permanent magnet 20a is equal to that of the middle slot. The first permanent magnet 20a has a gap with the first straight groove wall 121a of the middle groove, thereby facilitating assembly.

EXAMPLE five

According to a fourth aspect of the present invention, there is provided an electric machine comprising a rotor as provided in any of the above embodiments.

The utility model provides a motor, including the rotor that any above-mentioned embodiment provided, consequently have the whole beneficial effects of this rotor, no longer describe herein.

EXAMPLE six

According to a fifth aspect of the present invention, there is provided a vehicle comprising the motor provided in any one of the above embodiments.

The utility model discloses a vehicle that provides in an embodiment, including the motor that any above-mentioned embodiment provided, consequently have all beneficial effects of this motor, no longer describe herein.

It is worth mentioning that the vehicle may be a new energy automobile. The new energy automobile comprises a pure electric automobile, an extended range electric automobile, a hybrid electric automobile, a fuel cell electric automobile, a hydrogen engine automobile and the like.

Further, the motor provided by the above embodiment can be used as a driving motor of a vehicle. In particular, the drive motor alone enables the functional device of the vehicle to be started. Alternatively, the driving motor can cooperate with other driving devices on the vehicle to realize the normal operation of functional devices on the vehicle. The functional device of the vehicle can be any one or any combination of the following: wheels, air conditioners, light assemblies, etc.

Further, the vehicle includes a vehicle body in which the motor is mounted.

In the present application, the term "plurality" means two or more unless expressly defined otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

In the description of the present specification, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., 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, the schematic representations of the terms used above do not necessarily 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.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A rotor punching sheet is characterized by comprising:

punching a sheet body;

the shaft hole is arranged on the punching sheet body;

a plurality of mounting portions arranged on the punching sheet body around the shaft hole, each of the plurality of mounting portions including a plurality of magnet grooves, wherein,

the plurality of magnet grooves comprise first magnet grooves, the first magnet grooves are far away from the shaft hole and are arranged on the punching sheet body, the first magnet grooves comprise first straight groove walls far away from the shaft hole, and the plane where the first straight groove walls are located is a first end face;

the air gap groove is arranged on the punching sheet body and is positioned between the first magnet groove and the outer edge of the punching sheet body, and the air gap groove is positioned on one side, deviating from the shaft hole, of the first end face.

2. The rotor sheet as recited in claim 1,

the air gap groove is positioned between the end part of the first magnet groove and the outer edge of the punching sheet body.

3. The rotor punching sheet according to claim 2, wherein the punching sheet body comprises:

the first magnetic isolation bridge is positioned between the air gap groove and the first magnet groove, the first magnetic isolation bridge is provided with a first magnetic isolation end and a second magnetic isolation end which are deviated from each other, and the width of the first magnetic isolation end is different from that of the second magnetic isolation end.

4. The rotor sheet as recited in claim 3,

the number of the air gap grooves is two, the two air gap grooves are respectively arranged at two ends of the first magnet groove, a part of the punching sheet body positioned between the two air gap grooves and the first magnet groove is a first body, the first magnetism isolating end is positioned between the second magnetism isolating end and the first body, wherein,

the width of the second magnetism isolating end is larger than the width of the first magnetism isolating end and is less than or equal to 4 times of the width of the first magnetism isolating end.

5. The rotor sheet as recited in claim 4,

the width of the first magnetism isolating end is larger than or equal to the thickness of the punching sheet body.

6. The rotor sheet as recited in claim 4 or 5, wherein the first magnet slot comprises:

a middle section for housing a permanent magnet;

and the extension section is arranged at the end part of the middle section and communicated with the middle section.

7. The rotor sheet as recited in claim 6,

the minimum distance between two air gap grooves is d 1;

the width of the middle section is w 1;

the number of the extension sections is two, the two extension sections are respectively connected to two ends of the middle section, the maximum distance between the two extension sections is w2, wherein:

8. the rotor sheet as recited in claim 7,

the included angle that the center of two air gap grooves and the central line in shaft hole formed is theta, the periphery radius of punching the piece body is r, the maximum value of the radial width of first body is h1, wherein:

9. the rotor sheet as recited in claim 7,

the first magnetic isolation bridge is provided with a magnetic bridge edge close to the air gap groove, and the length of the magnetic bridge edge is L1, wherein:

10. the rotor punching sheet according to claim 4 or 5, wherein the punching sheet body further comprises:

the second magnetic isolation bridge is positioned between the air gap groove and the outer edge of the punching sheet body;

the width h of the second magnetic isolation bridge is greater than or equal to the thickness of the punching sheet body;

the width h of the second magnetism isolating bridge is smaller than the width t1 of the first magnetism isolating end.

11. The rotor blade as recited in any one of claims 1 to 5, wherein the plurality of magnet slots further comprise:

the two second magnet grooves are arranged on the punching sheet body, each of the two second magnet grooves is respectively provided with an inner end close to the shaft hole and an outer end far away from the shaft hole, the inner ends are close to each other, the outer ends are far away from each other, and the first magnet groove is arranged between the two outer ends.

12. A rotor core, comprising:

the rotor sheet as recited in any one of claims 1 to 11.

13. A rotor for an electric machine, comprising:

the rotor core of claim 12 wherein said core is,

the magnetic slots of the rotor punching sheets of the rotor core are communicated along the axial direction of the rotor core to form slots;

the permanent magnets are arranged in the slots in a one-to-one correspondence mode.

14. The rotor of claim 13,

the plurality of slots include:

the first slots are formed by first magnet grooves of the rotor punching sheets, and middle sections of the first magnet grooves form middle grooves of the slots;

the plurality of permanent magnets includes:

the first permanent magnet is inserted in the middle groove, and the width of the first permanent magnet is equal to that of the middle groove.

15. An electric machine, comprising:

a stator configured to form a fitting cavity; and

a rotor according to claim 13 or 14, the rotor being disposed within the assembly cavity.

16. A vehicle, characterized by comprising:

a vehicle body; and

the electric motor of claim 15, said electric motor being mounted within said vehicle body.