WO2023240970A1

WO2023240970A1 - Motor rotor, motor, and electric vehicle

Info

Publication number: WO2023240970A1
Application number: PCT/CN2022/140703
Authority: WO
Inventors: 陈彬; 贾金信; 刘健宁; 姜月明; 汪汉新
Original assignee: 珠海格力电器股份有限公司
Priority date: 2022-06-17
Filing date: 2022-12-21
Publication date: 2023-12-21
Also published as: CN115001178A

Abstract

The present disclosure provides a motor rotor, a motor, and an electric vehicle. The motor rotor comprises: a rotor core, provided with magnetic steel grooves and at least two magnetic barrier grooves. The two magnetic barrier grooves are symmetrically arranged relative to a D-axis of the rotor core; the two magnetic barrier grooves are located at positions between the magnetic steel grooves and the radial outer edge of the rotor core; the magnetic barrier grooves are not connected to the radial outer edge; the cross section of each magnetic barrier groove is a rectangular groove; an included angle ranging from 0° to 180° is formed between the extension lines of the long edges, facing the radial inner side, of the two rectangular grooves, so that the opening of the included angle faces the center of the rotor core to form an inverted V-shaped magnetic barrier structure. In the present disclosure, the inverted V-shaped magnetic barrier structure can be effectively distributed at the tail end of the D-axis of the rotor, so that an electromagnetic excitation force and torque ripple of the motor can be effectively reduced while the output performance of the motor is not affected, and thus the noise of the motor is reduced.

Description

Motor rotors, electric motors and electric vehicles

Cross-references to related applications

This disclosure is based on the Chinese application with application number 202210687771.7 and the filing date is June 17, 2022 , and claims its priority. The disclosure content of the Chinese application is hereby incorporated into this disclosure as a whole.

Technical field

The present disclosure relates to the field of motor technology, and specifically to a motor rotor, a motor and an electric vehicle.

Background technique

Most of the driving motors of automobiles are permanent magnet synchronous motors. This type of motor has high power density and small size, which is the current mainstream trend. However, because its rotor is a permanent magnet structure, its magnetic density remains constant, which makes the motor often have large torque pulsation and electromagnetic excitation force at high speeds, resulting in high vibration and noise of the motor.

At present, the commonly used method to reduce electromagnetic excitation force is to modify the rotor or stator, which can reduce the torque ripple and excitation force at a certain operating point. However, for vehicle drive motors, due to their The speed range is wide and the working conditions are complex, so simple modification methods often cannot meet the requirements.

Since in the related technologies known to the inventor, vehicle motors have technical problems such as large torque pulsation and high electromagnetic excitation force under multiple working conditions, which cannot be solved at the same time, the present disclosure researches and designs a motor rotor, a motor and an electric motor. car.

Contents of the invention

In order to solve the above problems, the present disclosure provides a motor rotor, which includes a rotor core. The rotor core is provided with magnetic steel slots and at least two magnetic barrier slots, and the two magnetic barrier slots are relative to the D axis of the rotor core. The two magnetic barrier slots are arranged symmetrically. The two magnetic barrier slots are located between the magnetic steel slot and the radial outer edge of the rotor core, and the magnetic barrier slots are not connected to the radial outer edge. The cross section of the magnetic barrier slot is a rectangular slot, and The extension lines of the long sides of the two rectangular slots facing radially inward form an included angle between 0 and 180°, so that the opening of the included angle faces the center of the rotor core, forming an "inverted V-shaped" magnetic barrier structure. .

In some embodiments, the magnetic steel groove includes a first magnetic steel groove and a second magnetic steel groove, and the first magnetic steel groove and the second magnetic steel groove are arranged symmetrically with respect to the D axis; the two magnetic barrier grooves include a first magnetic barrier slot and the second magnetic barrier slot, the first magnetic barrier slot is opposite to the first magnetic steel slot and is located between the first magnetic steel slot and the radial outer edge of the rotor core, the second magnetic barrier slot is The steel groove is opposite and located between the second magnetic steel groove and the radial outer edge of the rotor core.

In some embodiments, the motor rotor further includes magnetic steel, and the magnetic steel is disposed in the magnetic steel slot;

Wherein, the magnetic steel includes a first magnetic steel disposed in the first magnetic steel groove and a second magnetic steel disposed in the second magnetic steel groove. Both the first magnetic steel and the second magnetic steel have a rectangular structure.

In some embodiments, the first magnetic barrier groove and the second magnetic barrier groove are both rectangular grooves, and the side of the first magnetic barrier groove opposite to the second magnetic barrier groove is the first short side, and the side of the second magnetic barrier groove is the first short side. The side opposite to the first magnetic barrier groove is the second short side. The extension line of the first short side passes through a vertex of the rectangle of the first magnet. The extension line of the second short side passes through a vertex of the rectangle of the second magnet. .

In some embodiments, the extension line of the first short side passes through a vertex of the rectangle of the first magnet closest to the D axis, and the extension line of the second short side passes through a vertex of the rectangle of the second magnet closest to the D axis. vertex.

In some embodiments, both the first magnetic barrier groove and the second magnetic barrier groove are rectangular grooves, the side of the first magnetic barrier groove that is farthest from the second magnetic barrier groove is the third short side, and the second magnetic barrier groove The side farthest from the first magnetic barrier groove is the fourth short side. The extension line of the third short side passes through a long side of the rectangle of the first magnet. The extension line of the fourth short side passes through the second magnet. A long side of a rectangle.

In some embodiments, the extension line of the third short side passing through the long side of the rectangle of the first magnet is the long side located radially inside, and the extension line of the fourth short side passing through the long side of the rectangle of the second magnet is The long side located radially inward.

In some embodiments, the length of the long side of the rectangular magnetic barrier groove ranges from 10 mm to 12 mm; and/or the length of the short side of the rectangular magnetic barrier groove ranges from 1.5 mm to 2 mm.

In some embodiments, the portion of the first magnetic steel groove located radially outside the first magnetic steel is a first hollow groove structure, and the side of the first hollow groove structure that is connected to the first magnetic steel includes a first arc. and a second arc; the part of the second magnetic steel groove that is located radially outside the second magnetic steel is a second hollow groove structure, and the side of the second hollow groove structure that is connected to the second magnetic steel includes a third circle. arc and the fourth arc.

In some embodiments, the first arc and the second arc are located on the radially outer side of the first hollow groove structure, and the third arc and the fourth arc are located on the radially outer side of the second hollow groove structure. on the edge.

In some embodiments, one end of the first arc is connected to a vertex of the first magnetic steel, and the other end is extended to be connected to one end of the second arc, and the arc radius of the first arc is R1. The arc radius of the two arcs is R2, and R1<R2;

One end of the third arc is connected to a vertex of the second magnet, and the other end extends to connect with one end of the fourth arc. The arc radius of the third arc is R1, and the arc shape of the fourth arc is R1. The radius is R2, and R1<R2.

In some embodiments, R1 ranges from 5mm to 7mm, and R2 ranges from 25mm to 30mm.

In some embodiments, the first hollow groove structure further includes a first straight line segment, a second straight line segment and a third straight line segment. One end of the first straight line segment is connected to the other end of the second arc and is the second arc. The tangent extension line at the other end of the second straight line segment is connected to the other end of the first straight line segment, and the second straight line segment and the third straight line segment are connected in sequence, and the third straight line segment is connected to the first magnet;

The second hollow groove structure also includes a fourth straight line segment, a fifth straight line segment and a sixth straight line segment. One end of the fourth straight line segment is connected to the other end of the fourth arc and is a tangent line at the other end of the fourth arc. In the extension line, the fifth straight line segment is connected to the other end of the fourth straight line segment, and the fifth straight line segment and the sixth straight line segment are connected in sequence, and the sixth straight line segment is connected to the second magnet.

In some embodiments, the connection position between the first arc and the second arc and the center of the rotor core form a first center connection line, and the connection position between the third arc and the fourth arc is connected with the center of the rotor core. The center connection line of the core forms a second center connection line, and an included angle is formed between the first center connection line and the second center connection line.

The present disclosure also provides a motor, which includes a motor stator and the motor rotor of the above embodiment, and the stator is located on the outer periphery of the motor rotor.

In some embodiments, the motor stator includes stator slots arranged at intervals along the circumferential direction. The two magnetic barrier slots include a first magnetic barrier slot and a second magnetic barrier slot. The first magnetic barrier slot is opposite to the second magnetic barrier slot. The side of is the first short side, and the side of the second magnetic barrier groove opposite to the first magnetic barrier groove is the second short side;

A spacing portion is formed between the first short side and the second short side, the slot of the stator slot is opposite to the spacing portion, and the width of the spacing portion is greater than the width of the slot.

In some embodiments, the portion of the first magnetic steel groove located radially outside the first magnetic steel is a first hollow groove structure, and the edge of the first hollow groove structure connecting with the first magnetic steel includes a first arc and A second arc; the portion of the second magnetic steel groove located radially outside the second magnetic steel is a second hollow groove structure, and the side of the second hollow groove structure that is connected to the second magnetic steel includes a third arc. and the fourth arc,

And when the connecting position of the first arc and the second arc is connected with the center of the rotor core to form a first center connection line, the connecting position of the third arc and the fourth arc is connected with the center of the rotor core. The lines form the second center connection line;

The extension line of the first central connection line passes through the center of the notch of the stator slot opposite to it, and the extension line of the second central connection line passes through the center of the notch of the stator slot opposite to it.

In some embodiments, the extension line of the first central connection line passes through the center of the notch of the stator slot opposite to it, the extension line of the second central connection line passes through the center of the notch of the stator slot opposite to it, and the first The number of slots spaced along the circumferential direction between the extension line of the center connection and the extension line of the second center connection is Q/(2p)-1, where Q is the total number of slots in the stator and p is the number of pole pairs.

The present disclosure also provides an electric vehicle, which includes the motor of the above embodiment.

Description of the drawings

Figure 1 is a schematic diagram 1 of the motor rotor structure of the present disclosure;

Figure 2 is a schematic diagram 2 of the motor rotor structure of the present disclosure;

Figure 3 is a schematic diagram 3 of the motor rotor structure of the present disclosure;

Figure 4 is a schematic diagram 1 of the motor of the present disclosure;

Figure 5 is a load magnetic field line diagram of the motor of the present disclosure;

Figure 6 shows the peak electromagnetic force results of the motor of the present disclosure;

Figure 7 is a torque pulsation effect diagram of the motor of the present disclosure;

Figure 8 is a noise simulation rendering of the motor of the present disclosure.

The reference symbols are expressed as:

10. Rotor core; 11. Magnetic steel; 111. First magnetic steel; 112. Second magnetic steel; 12. Magnetic steel groove; 121. First magnetic steel groove; 1211. First hollow groove structure; 122. No. Two magnetic steel grooves; 1221, second hollow groove structure; 21, magnetic barrier groove; 211, first magnetic barrier groove; 2111, first short side; 2112, third short side; 2113, first long side; 212. The second magnetic barrier groove; 2121, the second short side; 2122, the fourth short side; 2123, the second long side; 25, the spacing part; 41, the first arc; 42, the second arc; 41', the Three arcs; 42', the fourth arc; 43, the first center connection line; 43', the second center connection line; 44, the first straight line segment; 45, the second straight line segment; 46, the third straight line segment; 44', fourth straight line segment; 45', fifth straight line segment; 46', sixth straight line segment; 49, included angle; 5, motor stator; 51, stator slot; 52, notch.

Detailed ways

Since the rotor of the permanent magnet synchronous motor has a permanent magnet structure, its magnetic density cannot be changed, which makes the electromagnetic excitation force of the motor large, resulting in loud vibration and noise of the motor. The electromagnetic excitation force is an intrinsic characteristic of the motor. At present, the commonly used method is to modify the rotor or stator. The shape of the modification will directly affect the result of the electromagnetic force. Complex modification will cause the rotor production process to change. difficulty.

Therefore, the technical problem to be solved by the present disclosure is to overcome the existing defects of large torque ripple and high electromagnetic excitation force in the existing vehicle motors under multiple working conditions, which cannot be solved at the same time, thereby providing a motor rotor, a motor and a electric car.

The motor rotor, motor and electric vehicle provided by the present disclosure have the following beneficial effects:

1. This disclosure uses a magnetic barrier slot located radially outside the magnetic steel slot on the rotor core and not connected with the radial outer edge of the rotor core, and the cross-section of the magnetic barrier slot is a rectangular slot, and the two rectangular slots An angle between 0 and 180° can be interposed between the extension lines of the long sides facing radially inward, so that the opening of the angle formed between the extension lines of the two radially inner long sides faces the rotor core. center, forming an "reverse V-shaped" magnetic barrier structure, thereby effectively distributing the "reverse V-shaped" magnetic barrier structure at the end of the d-axis of the rotor, which can effectively reduce the electromagnetic excitation force and vibration of the motor without affecting the output performance of the motor. Torque ripple, thereby reducing motor noise. The present disclosure also forms an effective progressive magnetic barrier structure at the end of the magnetic steel channel by arranging a structure including at least two arc sections on the edge of the hollow channel structure located radially outside the magnetic steel channel. At the same time, the electromagnetic vibration force and torque ripple of the motor are reduced, thereby reducing the motor noise.

2. The present disclosure also connects the connecting point of two arc sections of one magnetic steel slot with the center of the rotor through the center of the stator slot, and connects the connecting point of two arc sections of another magnetic steel slot with the rotor through the center of the stator slot. The center line passes through the center of the stator slot, and the number of circumferential spacing slots between the two centers is Q/(2p)-1, which can make the magnetic lines of force entering the rotor from two adjacent stator teeth have a uniform transition and reduce The change of electromagnetic force can effectively form the magnetic barrier structure of the rotor pole arc, and can also reduce the electromagnetic excitation force and torque pulsation of the motor without affecting the output performance of the motor, thereby reducing motor noise.

In order to solve the problems of large torque ripple and high electromagnetic excitation force of vehicle motors under multiple working conditions, the present disclosure provides a rotor structure that can simultaneously reduce torque ripple and excitation force.

As shown in Figures 1-8, the present disclosure provides a motor rotor, which includes: a rotor core 10. The rotor core 10 is provided with magnetic steel slots 12 and at least two magnetic barrier slots 21, and the two magnetic barrier slots are 21 is arranged symmetrically with respect to the D axis of the rotor core 10. The two magnetic barrier slots 21 are located between the magnetic steel slots 12 and the radial outer edge of the rotor core 10, and the magnetic barrier slots 21 are not in contact with the radial outer edge. Connected, the cross-section of the magnetic barrier groove 21 is a rectangular groove, and the extension lines of the long sides of the two rectangular grooves facing the radially inward form an included angle between 0 and 180°, so that the two radially inward The opening of the angle formed between the extension lines of the long sides faces the center of the rotor core 10, forming an "inverted V-shaped" magnetic barrier structure.

The present disclosure uses a magnetic barrier slot located radially outside the magnetic steel slot on the rotor core and not connected with the radial outer edge of the rotor core, and the cross section of the magnetic barrier slot is a rectangular slot, and the orientation of the two rectangular slots An angle between 0 and 180° can be set between the extension lines of the radially inner long sides, so that the opening of the angle formed between the extension lines of the two radially inner long sides faces the center of the rotor core, An "inverse V-shaped" magnetic barrier structure is formed, thereby effectively distributing the "reverse V-shaped" magnetic barrier structure at the end of the d-axis of the rotor, which can effectively reduce the electromagnetic excitation force and torque of the motor without affecting the output performance of the motor. pulsation, thereby reducing motor noise.

The following technical problems solved by this disclosure:

1. The motor torque pulsation is large;

2. The electromagnetic excitation force of the motor is large;

3. The motor vibrates and makes loud noise.

Beneficial effects:

1. The beneficial effects of the motor rotor of the present disclosure are:

2. Solve the problem of large torque pulsation of permanent magnet synchronous motors and reduce motor vibration at high speed;

3. Solve the problem of large electromagnetic excitation force of permanent magnet synchronous motor and reduce motor vibration noise.

Figure 5 is a load magnetic field line diagram using the motor of the present disclosure. The magnetic field lines in the figure are evenly distributed; Figure 6 is the peak electromagnetic force result of using the motor of the present disclosure. The peak electromagnetic force at 48 times the frequency is reduced by more than 90%; the torque under peak operating conditions The pulsation is reduced to 1.1%. Figure 7 is a torque pulsation effect diagram of the present disclosure, and the peak torque pulsation is reduced to 1.1%. Figure 8 is a noise simulation effect diagram, and the noise caused by electromagnetic force and torque pulsation is greatly reduced.

In some embodiments, the magnetic steel groove 12 includes a first magnetic steel groove 121 and a second magnetic steel groove 122. The first magnetic steel groove 121 and the second magnetic steel groove 122 are arranged symmetrically with respect to the D axis; two magnetic barrier grooves 21 includes a first magnetic barrier groove 211 and a second magnetic barrier groove 212. The first magnetic barrier groove 211 is opposite to the first magnetic steel groove 121 and is located between the first magnetic steel groove 121 and the radial outer edge of the rotor core 10 position, the second magnetic barrier groove 212 is opposite to the second magnetic steel groove 122 and is located between the second magnetic steel groove 122 and the radial outer edge of the rotor core 10 . This is the preferred structural form of the magnetic steel channel of the present disclosure, that is, it is also a first magnetic steel channel and a second magnetic steel channel that are symmetrically arranged with respect to the D axis, and defines a first magnetic barrier channel and a second magnetic barrier channel. The position can further optimize the path of the motor's magnetic field lines, thereby optimizing the motor vibration.

In some embodiments, it also includes magnetic steel 11 (preferably a permanent magnet), and the magnetic steel 11 is disposed in the magnetic steel slot 12;

The magnetic steel 11 includes a first magnetic steel 111 disposed in the first magnetic steel groove 121 and a second magnetic steel 112 disposed in the second magnetic steel groove 122. Both the first magnetic steel 111 and the second magnetic steel 112 are rectangular. structure.

This is a preferred structural form of the motor rotor of the present disclosure. A preferred arrangement of magnetic lines of force can be formed through the magnetic steel, the first magnet disposed in the first magnetic steel slot, and the second magnet disposed in the second magnetic steel slot. , the rectangular structure of the magnet can optimize the magnetic field line distribution of the present disclosure, thereby further reducing the electromagnetic excitation force and torque pulsation of the motor.

In some embodiments, both the first magnetic barrier groove 211 and the second magnetic barrier groove 212 are rectangular grooves, and the side of the first magnetic barrier groove 211 opposite to the second magnetic barrier groove 212 is the first short side 2111. The side of the second magnetic barrier groove 212 opposite to the first magnetic barrier groove 211 is the second short side 2121. The extension line of the first short side 2111 passes through a vertex of the rectangle of the first magnet 111, and the extension of the second short side 2121 The line passes through one vertex of the rectangle of the second magnet 112 .

The present disclosure can further optimize the path of the motor's magnetic field lines through such an arrangement relationship. When the above-mentioned special geometric relationship is satisfied, the rectangular magnetic barrier slot can have the best effect of reducing electromagnetic excitation force and torque pulsation, and can further optimize the motor vibration.

In some embodiments, the extension line of the first short side 2111 passes through a vertex of the rectangle of the first magnet 111 closest to the D axis, and the extension line of the second short side 2121 passes through the closest vertex of the rectangle of the second magnet 112 A vertex on the D axis. When this special geometric relationship is met, the rectangular magnetic barrier slot has the best effect of reducing electromagnetic excitation force and torque pulsation, and can further optimize the motor vibration.

In some embodiments, both the first magnetic barrier groove 211 and the second magnetic barrier groove 212 are rectangular grooves, and the side of the first magnetic barrier groove 211 that is farthest from the second magnetic barrier groove 212 is the third short side 2112. The side of the second magnetic barrier slot 212 that is farthest from the first magnetic barrier slot 211 is the fourth short side 2122. The extension line of the third short side 2112 passes through a long side of the rectangle of the first magnet 111. The fourth short side The extension line of the side 2122 passes through one long side of the rectangle of the second magnet 112 .

It is further preferred that the extended line of the long side of the rectangular magnetic barrier of the present disclosure passes through the outer vertex of the magnetic steel, and the extended line of the short side of the magnetic barrier passes through the inner vertex of the magnetic steel.

In some embodiments, the extension line of the third short side 2112 passes through the long side of the rectangle of the first magnet 111 and is the long side located radially inside, and the extension line of the fourth short side 2122 passes through the rectangle of the second magnet 112 The long side of is the long side located radially inside. When this special geometric relationship is met, the rectangular magnetic barrier slot has the best effect of reducing electromagnetic excitation force and torque pulsation, and can further optimize the motor vibration.

In some embodiments, the length of the long side of the rectangular magnetic barrier groove 21 ranges from 10 mm to 12 mm; the length of the short side of the rectangular magnetic barrier groove 21 ranges from 1.5 mm to 2 mm. The disclosed magnetic barrier is used to change the path of magnetic lines of force, so it needs to have a certain length and width, neither too small nor too large. The optimal effect of reducing electromagnetic excitation force and torque pulsation is within the range of 10mm-12mm.

In some embodiments, the portion of the first magnetic steel groove 121 located radially outside the first magnetic steel 111 is the first hollow groove structure 1211 , and the edge of the first hollow groove structure 1211 that is in contact with the first magnetic steel 111 It includes a first arc 41 and a second arc 42; the part of the second magnetic steel groove 122 located radially outside the second magnet 112 is the second hollow groove structure 1221, and the second hollow groove structure 1221 is the same as the second hollow groove structure 1221. The side where the two magnets 112 connect includes a third arc 41' and a fourth arc 42'. The present disclosure also forms an effective progressive magnetic barrier structure at the end of the magnetic steel channel by arranging a structure including at least two arc sections on the edge of the hollow channel structure located radially outside the magnetic steel channel. At the same time, the electromagnetic vibration force and torque ripple of the motor are reduced, thereby reducing the motor noise.

In some embodiments, the first arc 41 and the second arc 42 are located on the radially outer edge of the first hollow groove structure 1211, and the third arc 41' and the fourth arc 42' are located on the second On the radially outer edge of the hollow groove structure 1221. When this relationship is satisfied, the rectangular magnetic barrier slot can further improve the effect of reducing the electromagnetic excitation force and torque pulsation, and can further optimize the motor vibration.

In some embodiments, one end of the first arc 41 is connected to a vertex of the first magnetic steel 111 , and the other end is extended to be connected to one end of the second arc 42 , and the arc radius of the first arc 41 is is R1, the arc radius of the second arc 42 is R2, and R1<R2;

One end of the third arc 41' is connected to a vertex of the second magnet 112, and the other end extends to connect with one end of the fourth arc 42', and the arc radius of the third arc 41' is R1. The arc radius of the fourth arc 42' is R2, and R1<R2.

When this relationship is satisfied, the torque fluctuation can be optimized and the harmonics can be reduced; further, the rectangular magnetic barrier slot has a better effect of reducing the electromagnetic excitation force and torque pulsation, and can further optimize the motor vibration.

In some embodiments, the first hollow groove structure 1211 also includes a first straight line segment 44 , a second straight line segment 45 and a third straight line segment 46 , one end of the first straight line segment 44 is connected to the other end of the second arc 42 And is the tangent extension line at the other end of the second arc 42, the second straight line segment 45 is connected to the other end of the first straight line segment 44, and the second straight line segment 45 and the third straight line segment 46 are connected in sequence, and the third straight line segment 45 is connected to the other end of the first straight line segment 44. The straight section 46 is connected to the first magnet 111;

The second hollow groove structure 1221 also includes a fourth straight line segment 44', a fifth straight line segment 45' and a sixth straight line segment 46'. One end of the fourth straight line segment 44' is connected to the other end of the fourth arc 42'. is the tangent extension line at the other end of the fourth arc 42', the fifth straight line segment 45' is connected to the other end of the fourth straight line segment 44', and the fifth straight line segment 45' and the sixth straight line segment 46' are in sequence. Then, the sixth straight line segment 46' is connected with the second magnet 112.

When this relationship is satisfied, the effect of the magnetic steel groove in reducing the electromagnetic excitation force and torque pulsation can be further improved, and the motor vibration can be further optimized.

In some embodiments, the connecting position of the first arc 41 and the second arc 42 and the center of the rotor core 10 form a first center connection 43 , and the third arc 41 ′ and the fourth arc 42 ''s contact position and the center line of the rotor core 10 form a second center line 43', and an included angle 49 is formed between the first center line 43 and the second center line 43'. When this relationship is satisfied, the effect of the magnetic steel groove in reducing the electromagnetic excitation force and torque pulsation can be further improved, and the motor vibration can be further optimized.

The present disclosure also provides a motor, which includes a motor stator and the motor rotor of the above embodiment, and the motor stator is located on the outer periphery of the motor rotor.

In some embodiments, the motor stator 5 includes stator slots 51 arranged at intervals along the circumferential direction. The two magnetic barrier slots 21 include a first magnetic barrier slot 211 and a second magnetic barrier slot 212 . The first magnetic barrier slot 211 and The opposite side of the second magnetic barrier groove 212 is the first short side 2111, and the opposite side of the second magnetic barrier groove 212 to the first magnetic barrier groove 211 is the second short side 2121;

A spacing portion 25 is formed between the first short side 2111 and the second short side 2121 . The notch 52 of the stator slot 51 is opposite to the spacing portion 25 , and the width of the spacing portion 25 is greater than the width of the notch 52 .

In some embodiments, the portion of the first magnetic steel groove 121 located radially outside the first magnetic steel 111 is the first hollow groove structure 1211, and the side where the first hollow groove structure 1211 connects with the first magnetic steel 111 includes The first arc 41 and the second arc 42; the part of the second magnetic steel groove 122 located radially outside the second magnetic steel 112 is the second hollow groove structure 1221, and the second hollow groove structure 1221 is connected to the second magnetic steel groove 122. The connecting sides of the steel 112 include the third arc 41' and the fourth arc 42',

And the connecting position of the first arc 41 and the second arc 42 and the center of the rotor core 10 form the first center connecting line 43, and the connecting position of the third arc 41' and the fourth arc 42' The second center connection line 43' is formed with the center line of the rotor core 10;

The extension line of the first central connection line 43 passes through the center of the notch 52 of the stator slot 51 opposite to it, and the extension line of the second central connection line 43' passes through the center of the notch 52 of the stator slot 51 opposite to it.

In some embodiments, the extension line of the first central connection line 43 passes through the center of the notch 52 of the stator slot 51 opposite to it, and the extension line of the second central connection line 43' passes through the notch of the stator slot 51 opposite to it. At the center of 52, the number of slots separated in the circumferential direction between the extension line of the first center connection line 43 and the extension line of the second center connection line 43' is Q/(2p)-1, where Q is the total number of slots in the stator. , p is a polar logarithm.

The present disclosure also connects the connecting point of two arc sections of one magnetic steel slot with the rotor center through the center of the stator slot, and connects the connecting point of two arc sections of another magnetic steel slot symmetrically with the rotor center. The line passes through the center of the stator slot, and the number of circumferential spacing slots between the two centers is Q/(2p)-1, which can effectively make the connection point of the two arcs at the center of the stator slot, and can make the connection between two adjacent arcs The magnetic lines of force entering the rotor from each stator tooth have a uniform transition, which reduces the change of electromagnetic force and forms a magnetic barrier structure of the rotor pole arc. It can also reduce the electromagnetic excitation force and torque pulsation of the motor without affecting the output performance of the motor. Thereby reducing motor noise.

Those skilled in the art can easily understand that the advantageous technical features of the above methods can be freely combined and superimposed without conflict.

The above are only preferred embodiments of the present disclosure and are not intended to limit the present disclosure. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure. Inside. The above are only the preferred embodiments of the present disclosure. It should be pointed out that for those of ordinary skill in the art, several improvements and modifications can be made without departing from the technical principles of the present disclosure. These improvements and modifications should also be considered. regarded as the scope of protection of this disclosure.

Claims

A motor rotor includes a rotor core (10). The rotor core (10) is provided with a magnetic steel slot (12) and at least two magnetic barrier slots (21), and the two magnetic barrier slots (21) 21) Arranged symmetrically with respect to the D axis of the rotor core (10), the two magnetic barrier slots (21) are located radially outward of the magnetic steel slot (12) and the rotor core (10) between the edges, and the magnetic barrier groove (21) is not connected to the radial outer edge. The cross section of the magnetic barrier groove (21) is a rectangular groove, and the two rectangular grooves are oriented in the radial direction. The extension lines of the inner long sides form an included angle between 0 and 180°, so that the opening of the included angle faces the center of the rotor core (10), forming an "inverted V-shaped" magnetic barrier structure.
The motor rotor according to claim 1, wherein the magnetic steel groove (12) includes a first magnetic steel groove (121) and a second magnetic steel groove (122), and the first magnetic steel groove (121) and the The second magnetic steel groove (122) is arranged symmetrically with respect to the D axis; the two magnetic barrier grooves (21) include a first magnetic barrier groove (211) and a second magnetic barrier groove (212). A magnetic barrier groove (211) is opposite to the first magnetic steel groove (121) and is located between the first magnetic steel groove (121) and the radial outer edge of the rotor core (10), The second magnetic barrier groove (212) is opposite to the second magnetic steel groove (122) and is located between the second magnetic steel groove (122) and the radial outer edge of the rotor core (10) s position.
The motor rotor according to claim 2, further comprising a magnetic steel (11), the magnetic steel (11) being arranged in the magnetic steel groove (12);

Wherein, the magnetic steel (11) includes a first magnetic steel (111) disposed in the first magnetic steel groove (121) and a second magnetic steel disposed in the second magnetic steel groove (122). (112), the first magnetic steel (111) and the second magnetic steel (112) are both rectangular structures.
The motor rotor according to claim 3, wherein the first magnetic barrier slot (211) and the second magnetic barrier slot (212) are both rectangular slots, and the first magnetic barrier slot (211) is The side opposite to the second magnetic barrier groove (212) is the first short side (2111), and the side opposite to the first magnetic barrier groove (211) on the second magnetic barrier groove (212) is the second short side. Short side (2121), the extension line of the first short side (2111) passes through a vertex of the rectangle of the first magnet (111), and the extension line of the second short side (2121) passes through the first Two magnets (112) are at one vertex of the rectangle.
The motor rotor according to claim 4, wherein the extension line of the first short side (2111) passes through a vertex of the rectangle of the first magnet (111) closest to the D axis, and the second The extension line of the short side (2121) passes through a vertex of the rectangle of the second magnet (112) closest to the D axis.
The motor rotor according to any one of claims 3-5, wherein the first magnetic barrier slot (211) and the second magnetic barrier slot (212) are both rectangular slots, and the first magnetic barrier slot (212) is a rectangular slot. The side of the second magnetic barrier groove (211) farthest from the second magnetic barrier groove (212) is the third short side (2112), and the second magnetic barrier groove (212) is separated from the first magnetic barrier groove (211). The farthest side is the fourth short side (2122), and the extension line of the third short side (2112) passes through a long side of the rectangle of the first magnet (111). The fourth short side (2122) The extension line of 2122) passes through one long side of the rectangle of the second magnet (112).
The motor rotor according to claim 6, wherein the extension line of the third short side (2112) passes through the long side of the rectangle of the first magnet (111) and is the long side located radially inside, and the third short side (2112) passes through the rectangular long side of the first magnet (111). The extension lines of the four short sides (2122) passing through the long side of the rectangle of the second magnet (112) are the long sides located radially inside.
The motor rotor according to any one of claims 1 to 7, wherein the length of the long side of the rectangular magnetic barrier slot (21) ranges from 10 mm to 12 mm; and/or the rectangular magnetic barrier slot (21) The length of the short side ranges from 1.5mm to 2mm.
The motor rotor according to any one of claims 3-7, wherein the part of the first magnetic steel groove (121) located radially outside the first magnetic steel (111) is a first hollow groove structure ( 1211), and the side of the first hollow groove structure (1211) that is connected to the first magnetic steel (111) includes a first arc (41) and a second arc (42); the second The part of the magnetic steel groove (122) located radially outside the second magnetic steel (112) is a second hollow groove structure (1221), and the second hollow groove structure (1221) is different from the second hollow groove structure (1221). The connecting sides of the magnetic steel (112) include a third arc (41') and a fourth arc (42').
The motor rotor according to claim 9, wherein the first arc (41) and the second arc (42) are located on radially outer edges of the first hollow slot structure (1211), The third arc (41') and the fourth arc (42') are both located on the radially outer edge of the second hollow groove structure (1221).
The motor rotor according to claim 9 or 10, wherein,

One end of the first arc (41) is connected to a vertex of the first magnetic steel (111), and the other end is extended to be connected to one end of the second arc (42), and the third The arc radius of one arc (41) is R1, the arc radius of the second arc (42) is R2, and R1<R2;

One end of the third arc (41') is connected to a vertex of the second magnet (112), and the other end is extended to be connected to one end of the fourth arc (42'), and the The arc radius of the third arc (41') is R1, the arc radius of the fourth arc (42') is R2, and R1<R2.
The motor rotor according to claim 11, wherein R1 ranges from 5mm to 7mm, and R2 ranges from 25mm to 30mm.
The motor rotor according to any one of claims 9-12, wherein,

The first hollow groove structure (1211) also includes a first straight line segment (44), a second straight line segment (45) and a third straight line segment (46). One end of the first straight line segment (44) is connected to the first straight line segment (44). The other end of the second arc (42) is connected and is a tangent extension line at the other end of the second arc (42). The second straight line segment (45) is connected to the first straight line segment (45). 44), and the second straight line segment (45) and the third straight line segment (46) are connected in sequence, and the third straight line segment (46) is connected with the first magnet steel (111) catch;

The second hollow groove structure (1221) also includes a fourth straight line segment (44'), a fifth straight line segment (45') and a sixth straight line segment (46'). The fourth straight line segment (44') One end is connected to the other end of the fourth arc (42') and is a tangent extension line at the other end of the fourth arc (42'), and the fifth straight segment (45') is connected to The other end of the fourth straight line segment (44'), and the fifth straight line segment (45') and the sixth straight line segment (46') are connected in sequence, and the sixth straight line segment (46') Connected to the second magnet (112).
The motor rotor according to any one of claims 9-13, wherein the connecting position of the first arc (41) and the second arc (42) is aligned with the center of the rotor core (10) The connection forms a first center connection line (43), and the connecting position of the third arc (41') and the fourth arc (42') is connected with the center line of the rotor core (10) A second center connection line (43') is formed, and an included angle (49) is formed between the first center connection line (43) and the second center connection line (43').
A motor includes a motor stator (5) and the motor rotor according to any one of claims 1 to 14, the motor stator (5) being located on the outer periphery of the motor rotor.
The motor according to claim 15, wherein the motor stator (5) includes stator slots (51) arranged at intervals along the circumferential direction, and the two magnetic barrier slots (21) include a first magnetic barrier slot (211) ) and a second magnetic barrier groove (212). The side opposite the first magnetic barrier groove (211) and the second magnetic barrier groove (212) is the first short side (2111). The second magnetic barrier groove (211) is the first short side (2111). The side of the groove (212) opposite to the first magnetic barrier groove (211) is the second short side (2121);

A spacing portion (25) is formed between the first short side (2111) and the second short side (2121), and the notch (52) of the stator slot (51) is opposite to the spacing portion (25). , and the width of the spacing portion (25) is greater than the width of the notch (52).
The motor according to claim 16, wherein

The part of the first magnetic steel groove (121) located on the radial outer side of the first magnetic steel (111) is a first hollow groove structure (1211), and the first hollow groove structure (1211) and the The connecting sides of the first magnetic steel (111) include a first arc (41) and a second arc (42); the second magnetic steel groove (122) is located on the diameter of the second magnetic steel (112). The outer part is the second hollow groove structure (1221), and the side of the second hollow groove structure (1221) that is connected to the second magnetic steel (112) includes a third arc (41') and The fourth arc (42'),

And the connection position between the first arc (41) and the second arc (42) and the center of the rotor core (10) forms a first center connection line (43). The connection position between the three arcs (41') and the fourth arc (42') and the center of the rotor core (10) form a second center connection (43');

The extension line of the first center connection line (43) passes through the center of the slot (52) of the stator slot (51) opposite to it, and the extension line of the second center connection line (43') passes through the center of the slot (52) of the stator slot (51) opposite to it. The center of the slot (52) of the stator slot (51).
The motor according to claim 17, wherein the extension line of the first center connection (43) passes through the center of the slot (52) of the stator slot (51) opposite to it, and the second center connection The extension line of the line (43') passes through the center of the slot (52) of the stator slot (51) opposite to it, and the extension line of the first center connection line (43) and the second center connection line The number of slots spaced apart along the circumferential direction between the extension lines of (43') is Q/(2p)-1, where Q is the total number of slots in the stator and p is the number of pole pairs.
An electric vehicle, including the motor according to any one of claims 15-18.