Electric motor rotor, electric motor and electric vehicle

Abstract

The application provides a motor rotor, a motor and an electric vehicle, and the motor rotor comprises: a rotor core, the rotor core is provided with a magnetic steel slot and at least two magnetic barrier slots, the two magnetic barrier slots are symmetrically arranged relative to a D-axis of the rotor core, the two magnetic barrier slots are located between the magnetic steel slot and a radial outer edge of the rotor core, the magnetic barrier slots do not connect with the radial outer edge, the cross section of the magnetic barrier slots is a rectangular slot, and the angle between the extension lines of the long edges of the two rectangular slots towards the radial inner side is 0-180 degrees, so that the opening of the included angle between the extension lines of the two radial inner long edges is towards the center of the rotor core, and a magnetic barrier structure in the shape of "inverted V" is formed. According to the application, the magnetic barrier structure in the shape of "inverted V" can be effectively distributed at the end of the d-axis of the rotor, the electromagnetic exciting force and torque ripple of the motor can be effectively reduced without affecting the output performance of the motor, and the motor noise is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to an electric machine rotor, an electric machine and an electric vehicle. BACKGROUND

[0002] The automobile driving electric machine is mostly permanent magnet synchronous electric machine, the power density of this kind of electric machine is high, the volume is small, and it is the current mainstream trend. But because the rotor of the electric machine is permanent magnet structure, the characteristic of invariable magnetic density makes the electric machine have big torque ripple and big electromagnetic exciting force at high speed, thus causing big electric machine vibration and noise.

[0003] At present, the method generally used in reducing electromagnetic exciting force is to modify the rotor or stator, which can reduce the torque ripple and exciting force of a certain working condition point, but for the driving electric machine of the vehicle, because the speed range is wide and the working condition is complex, the simple modification method cannot meet the requirements.

[0004] Because the existing vehicle electric machine has big torque ripple and high electromagnetic exciting force in multiple working conditions, and cannot solve the above technical problems at the same time, the present application designs an electric machine rotor, an electric machine and an electric vehicle. SUMMARY

[0005] Therefore, the present application aims to overcome the defects in the prior art that the vehicle electric machine has big torque ripple and high electromagnetic exciting force in multiple working conditions, and cannot solve the above technical problems at the same time, so as to provide an electric machine rotor, an electric machine and an electric vehicle.

[0006] In order to solve the above problems, the present application provides an electric machine rotor, which comprises: a rotor core, a magnetic steel slot and at least two magnetic barrier slots are arranged on the rotor core, the two magnetic barrier slots are symmetrically arranged with respect to the D-axis of the rotor core, 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 slot does not connect with the radial outer edge, the cross section of the magnetic barrier slot is a rectangular slot, and the angle between the extension lines of the two radial inner long sides of the rectangular slot is 0-180°, so that the opening angle between the extension lines of the two radial inner long sides is formed towards the center of the rotor core, forming a "reverse V-shaped" magnetic barrier structure.

[0007] In some embodiments, the magnetic steel slot comprises a first magnetic steel slot and a second magnetic steel slot, and the first magnetic steel slot and the second magnetic steel slot are also symmetrically arranged with respect to the D-axis; the two magnetic barrier slots comprise a first magnetic barrier slot and a second magnetic barrier slot, the first magnetic barrier slot is opposite to the first magnetic steel slot and located between the first magnetic steel slot and the radial outer edge of the rotor core, and the second magnetic barrier slot is opposite to the second magnetic steel slot and located between the second magnetic steel slot and the radial outer edge of the rotor core.

[0008] In some embodiments, a magnetic steel is further included, and the magnetic steel is arranged in the magnetic steel slot.

[0009] The magnetic steel includes a first magnetic steel arranged in the first magnetic steel slot and a second magnetic steel arranged in the second magnetic steel slot, and the first magnetic steel and the second magnetic steel are both rectangular structures.

[0010] In some embodiments, the first magnetic barrier slot and the second magnetic barrier slot are both rectangular slots, and a side of the first magnetic barrier slot opposite to the second magnetic barrier slot is a first short side, and a side of the second magnetic barrier slot opposite to the first magnetic barrier slot is a second short side, and an extension line of the first short side passes through one vertex of the rectangle of the first magnetic steel, and an extension line of the second short side passes through one vertex of the rectangle of the second magnetic steel.

[0011] In some embodiments, the extension line of the first short side passes through one vertex of the rectangle of the first magnetic steel closest to the D-axis, and the extension line of the second short side passes through one vertex of the rectangle of the second magnetic steel closest to the D-axis.

[0012] In some embodiments, the first magnetic barrier slot and the second magnetic barrier slot are both rectangular slots, and a side of the first magnetic barrier slot farthest from the second magnetic barrier slot is a third short side, and a side of the second magnetic barrier slot farthest from the first magnetic barrier slot is a fourth short side, and an extension line of the third short side passes through one long side of the rectangle of the first magnetic steel, and an extension line of the fourth short side passes through one long side of the rectangle of the second magnetic steel.

[0013] In some embodiments, the extension line of the third short side passes through a long side of the rectangle of the first magnetic steel which is a long side on the inner side in the radial direction, and the extension line of the fourth short side passes through a long side of the rectangle of the second magnetic steel which is a long side on the inner side in the radial direction.

[0014] In some embodiments, the long side of the rectangular magnetic barrier slot ranges from 10 to 12 mm, and the short side of the rectangular magnetic barrier slot ranges from 1.5 to 2 mm.

[0015] In some embodiments, a part of the first magnetic steel slot on the outer side in the radial direction of the first magnetic steel is a first hollow slot structure, and a side of the first hollow slot structure connected to the first magnetic steel includes a first circular arc and a second circular arc; and a part of the second magnetic steel slot on the outer side in the radial direction of the second magnetic steel is a second hollow slot structure, and a side of the second hollow slot structure connected to the second magnetic steel includes a third circular arc and a fourth circular arc.

[0016] In some embodiments, the first arc and the second arc are located on the edge radially outside the first hollow slot structure, and the third arc and the fourth arc are located on the edge radially outside the second hollow slot structure.

[0017] In some embodiments, one end of the first arc is connected to one vertex of the first magnetic steel, and the other end of the first arc extends 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 second arc is R2, and R1 < R2.

[0018] One end of the third arc is connected to one vertex of the second magnetic steel, and the other end of the third arc extends to be connected to one end of the fourth arc, and the arc radius of the third arc is R1, the arc radius of the fourth arc is R2, and R1 < R2.

[0019] In some embodiments, R1 is 5-7 mm, and R2 is 25-30 mm.

[0020] In some embodiments, the first hollow slot structure further comprises 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 an extension of the tangent line at the other end of the second arc, the other end of the first straight line segment is connected to the second 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 magnetic steel.

[0021] The second hollow slot structure further comprises 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 an extension of the tangent line at the other end of the fourth arc, the other end of the fourth straight line segment is connected to the fifth 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 magnetic steel.

[0022] In some embodiments, the connection position of the first arc and the second arc and the center line of the rotor core form a first center line, the connection position of the third arc and the fourth arc and the center line of the rotor core form a second center line, and the first center line and the second center line form an included angle.

[0023] The application also provides an electric machine, which comprises the electric machine rotor of any one of the preceding items, and further comprises an electric machine stator, wherein the stator is located on the outer periphery of the electric machine rotor.

[0024] In some embodiments, the motor stator comprises stator slots arranged in sequence along the circumference, when two of the magnetic barrier slots comprise a first magnetic barrier slot and a second magnetic barrier slot, the edge of the first magnetic barrier slot opposite to the second magnetic barrier slot is a first short edge, and the edge of the second magnetic barrier slot opposite to the first magnetic barrier slot is a second short edge:

[0025] a spacing portion is formed between the first short edge and the second short edge, the slot opening 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 opening.

[0026] In some embodiments, when the portion of the first magnetic steel slot radially outside the first magnetic steel is a first hollow slot structure, and the edge of the first hollow slot structure connected to the first magnetic steel comprises a first circular arc and a second circular arc; the portion of the second magnetic steel slot radially outside the second magnetic steel is a second hollow slot structure, and the edge of the second hollow slot structure connected to the second magnetic steel comprises a third circular arc and a fourth circular arc,

[0027] and when the joint position of the first circular arc and the second circular arc and the center line of the rotor core form a first center line, and the joint position of the third circular arc and the fourth circular arc and the center line of the rotor core form a second center line:

[0028] the extension line of the first center line passes through the center of the slot opening of the stator slot opposite to it, and the extension line of the second center line passes through the center of the slot opening of the stator slot opposite to it.

[0029] In some embodiments, the extension line of the first center line passes through the center of the slot opening of the stator slot opposite to it, and the extension line of the second center line passes through the center of the slot opening of the stator slot opposite to it.

[0030] The application also provides an electric vehicle comprising the motor of any one of the preceding.

[0031] The motor rotor, motor and electric vehicle provided by the application have the following beneficial effects:

[0032] 1. The present application is characterized in that the magnetic barrier groove is located radially outside the magnet slot and does not contact the radially outer edge of the rotor core, the cross section of the magnetic barrier groove is a rectangular slot, and the angle between the extension lines of the two radially inner long sides of the rectangular slot is 0-180°, so that the opening angle between the extension lines of the two radially inner long sides is formed towards the center of the rotor core, forming a "reverse V-shaped" magnetic barrier structure, effectively distributing the "reverse V-shaped" magnetic barrier structure at the d-axis end of the rotor, effectively reducing the electromagnetic excitation force and torque ripple of the motor without affecting the output performance of the motor, thereby reducing the noise of the motor. The present application also provides a structure comprising at least two circular arcs on the edge of the hollow slot structure located radially outside the magnet of the magnet slot, forming an effective gradual magnetic barrier structure at the end of the magnet slot, thereby also reducing the electromagnetic excitation force and torque ripple of the motor, thereby reducing the noise of the motor.

[0033] 2. The present application also provides that the intersection point of the two circular arcs of a magnet slot passes through the center of the stator slot, and the intersection point of the two circular arcs of another magnet slot symmetrically opposite to the first magnet slot passes through the center of the stator slot, and the circumferential interval between the two centers is Q / (2p)-1, so that the magnetic force lines entering the rotor from the adjacent two stator teeth have a uniform transition, reducing the electromagnetic force change, effectively forming the magnetic barrier structure of the rotor pole arc, and also reducing the electromagnetic excitation force and torque ripple of the motor without affecting the output performance of the motor, thereby reducing the noise of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 The schematic diagram of the motor rotor structure of the present application Figure 1

[0035] Figure 2 The schematic diagram of the motor rotor structure of the present application Figure 2

[0036] Figure 3 The schematic diagram of the motor rotor structure of the present application Figure 3

[0037] Figure 4 The schematic diagram of the motor of the present application Figure 1

[0038] Figure 5 The effect of the motor of the present application Figure 1

[0039] Figure 6 The effect of the motor of the present application Figure 2

[0040] Figure 7 The effect of the motor of the present application Figure 3 ;​​​​​​

[0041] Figure 8 Effects of the motor of the present application Figure 4 .

[0042] Reference signs are shown as:

[0043] 10, rotor core; 11, magnetic steel; 111, first magnetic steel; 112, second magnetic steel; 12, magnetic steel slot; 121, first magnetic steel slot; 1211, first hollow slot structure; 122, second magnetic steel slot; 1221, second hollow slot structure; 21, magnetic barrier slot; 211, first magnetic barrier slot; 2111, first short side; 2112, third short side; 2113, first long side; 212, second magnetic barrier slot; 2121, second short side; 2122, fourth short side; 2123, second long side; 25, spacing portion; 41, first circular arc; 42, second circular arc; 41', third circular arc; 42', fourth circular arc; 43, first center connecting line; 43', second center connecting line; 44, first straight line segment; 45, second straight line segment; 46, 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, slot opening. DETAILED DESCRIPTION

[0044] Since the rotor of the permanent magnet synchronous motor is a permanent magnet structure, the characteristic that the magnetic density cannot be changed makes the electromagnetic excitation force of the motor larger, thereby causing large motor vibration noise. The electromagnetic excitation force is an inherent characteristic of the motor, and currently, the method generally adopted is to modify the shape of the rotor or the stator, and the modified shape will directly affect the result of the electromagnetic force. Complicated modification will lead to difficult production process of the rotor.

[0045] In order to solve the problems of large torque ripple and high electromagnetic excitation force of the motor under multiple working conditions, the present application provides a rotor structure which can simultaneously reduce the torque ripple and the excitation force.

[0046] As shown in Figures 1-8 The present application provides a motor rotor, which comprises: a rotor core 10, wherein a magnetic steel slot 12 and at least two magnetic barrier slots 21 are arranged on the rotor core 10, the two magnetic barrier slots 21 are symmetrically arranged relative to the D-axis of the rotor core 10, the two magnetic barrier slots 21 are located between the magnetic steel slot 12 and the radial outer edge of the rotor core 10, and the magnetic barrier slot 21 does not connect with the radial outer edge, the cross section of the magnetic barrier slot 21 is a rectangular slot, and the angle between the extensions of the long sides of the two rectangular slots towards the radial inner side is 0-180°, so that the opening of the included angle formed between the extensions of the two radial inner long sides faces the center of the rotor core 10, forming a "reverse V-shaped" magnetic barrier structure.

[0047] The present application solves the following technical problems:

[0048] The present application solves the following technical problems:

[0049] 1. The motor torque ripple is large;

[0050] 2. The electromagnetic excitation force of the motor is large;

[0051] 3. The motor vibration noise is large.

[0052] Advantages:

[0053] 1. The motor rotor of the present application has the following advantages:

[0054] 2. The problem of large torque ripple of the permanent magnet synchronous motor is solved, and the motor vibration at high speed is reduced;

[0055] 3. The problem of large electromagnetic excitation force of the permanent magnet synchronous motor is solved, and the motor vibration noise is reduced.

[0056] Figure 5 For the load magnetic field diagram of the motor using the present application, the magnetic field distribution is uniform in the diagram; Figure 6 For the peak electromagnetic force result of the motor using the present application, the 48 times frequency peak electromagnetic force is reduced by more than 90%; the torque ripple at peak working condition is reduced to 1.1%, Figure 7 For the torque ripple effect diagram of the present application, the peak torque ripple is reduced to 1.1%; Figure 8 For the noise simulation effect diagram, the noise caused by electromagnetic force and torque ripple is greatly reduced.

[0057] In some embodiments, the magnetic steel slot 12 comprises a first magnetic steel slot 121 and a second magnetic steel slot 122, which are also symmetrically arranged relative to the D-axis; the two magnetic barrier slots 21 comprise a first magnetic barrier slot 211 and a second magnetic barrier slot 212, the first magnetic barrier slot 211 is opposite to the first magnetic steel slot 121 and is located between the first magnetic steel slot 121 and the radial outer edge of the rotor core 10, and the second magnetic barrier slot 212 is opposite to the second magnetic steel slot 122 and is located between the second magnetic steel slot 122 and the radial outer edge of the rotor core 10. This is the preferred structural form of the magnetic steel slot of the present application, that is, it is also a first magnetic steel slot and a second magnetic steel slot which are symmetrically arranged relative to the D-axis, and the positions of the first magnetic barrier slot and the second magnetic barrier slot are defined, which can further optimize the path of the magnetic force line of the motor, thereby optimizing the vibration of the motor.

[0058] In some embodiments, a magnetic steel 11 (preferably a permanent magnet) is further included, which is arranged in the magnetic steel slot 12;

[0059] The magnetic steel 11 comprises a first magnetic steel 111 arranged in the first magnetic steel slot 121 and a second magnetic steel 112 arranged in the second magnetic steel slot 122, both of which are rectangular structures.

[0060] This is the preferred structural form of the motor rotor of the present application, which can form a preferred magnetic force line arrangement through the magnetic steel and the first magnetic steel arranged in the first magnetic steel slot and the second magnetic steel arranged in the second magnetic steel slot, and the rectangular structure of the magnetic steel can optimize the magnetic force line distribution of the present application, thereby further reducing the electromagnetic excitation force and torque ripple of the motor.

[0061] In some embodiments, the first magnetic barrier slot 211 and the second magnetic barrier slot 212 are both rectangular slots, and the edge opposite to the second magnetic barrier slot 212 on the first magnetic barrier slot 211 is a first short edge 2111, and the edge opposite to the first magnetic barrier slot 211 on the second magnetic barrier slot 212 is a second short edge 2121, and the extension line of the first short edge 2111 passes through one vertex of the rectangle of the first magnetic steel 111, and the extension line of the second short edge 2121 passes through one vertex of the rectangle of the second magnetic steel 112.

[0062] The present application can further optimize the path of the magnetic force line of the motor through such an arrangement, and when the above special geometric relationship is met, the rectangular magnetic barrier slot can best reduce the electromagnetic excitation force and torque ripple, and the vibration of the motor can be further optimized.

[0063] In some embodiments, the extension line of the first short side 2111 passes through one vertex of the rectangle of the first magnetic steel 111 closest to the D-axis, and the extension line of the second short side 2121 passes through one vertex of the rectangle of the second magnetic steel 112 closest to the D-axis. When the special geometric relationship is met, the effect of reducing the electromagnetic exciting force and torque ripple of the rectangular magnetic barrier slot is best, and the motor vibration can be further optimized.

[0064] In some embodiments, the first magnetic barrier slot 211 and the second magnetic barrier slot 212 are both rectangular slots, the edge of the first magnetic barrier slot 211 farthest from the second magnetic barrier slot 212 is a third short side 2112, the edge of the second magnetic barrier slot 212 farthest from the first magnetic barrier slot 211 is a fourth short side 2122, the extension line of the third short side 2112 passes through one long side of the rectangle of the first magnetic steel 111, and the extension line of the fourth short side 2122 passes through one long side of the rectangle of the second magnetic steel 112.

[0065] The present application can further optimize the path of the motor magnetic line by such a setting relationship. When the special geometric relationship is met, the effect of reducing the electromagnetic exciting force and torque ripple of the rectangular magnetic barrier slot is best, and the motor vibration can be further optimized.

[0066] It is further preferred that the extension line of the long side of the rectangular magnetic barrier passes through the outer vertex of the magnetic steel, and the extension line of the short side of the magnetic barrier passes through the inner vertex of the magnetic steel.

[0067] In some embodiments, the extension line of the third short side 2112 passes through the long side of the rectangle of the first magnetic steel 111, which is the long side located on the inner side in the radial direction, and the extension line of the fourth short side 2122 passes through the long side of the rectangle of the second magnetic steel 112, which is the long side located on the inner side in the radial direction. When the special geometric relationship is met, the effect of reducing the electromagnetic exciting force and torque ripple of the rectangular magnetic barrier slot is best, and the motor vibration can be further optimized.

[0068] In some embodiments, the long side of the rectangular magnetic barrier slot 21 ranges from 10 to 12 mm, and the short side of the rectangular magnetic barrier slot 21 ranges from 1.5 to 2 mm. The magnetic barrier of the present application is used to change the path of the magnetic line, so it needs to have a certain length and width, and cannot be too small or too large. The range of 10-12 mm has the optimal effect of reducing the electromagnetic exciting force and torque ripple.

[0069] In some embodiments, the part of the first magnetic steel slot 121 located radially outside the first magnetic steel 111 is a first hollow slot structure 1211, and the edge of the first hollow slot structure 1211 connected with the first magnetic steel 111 comprises a first circular arc 41 and a second circular arc 42; the part of the second magnetic steel slot 122 located radially outside the second magnetic steel 112 is a second hollow slot structure 1221, and the edge of the second hollow slot structure 1221 connected with the second magnetic steel 112 comprises a third circular arc 41' and a fourth circular arc 42'. The present application also reduces the electromagnetic excitation force and torque ripple of the motor by arranging the structure comprising at least two circular arcs on the edge of the hollow slot structure of the magnetic steel slot located radially outside the magnetic steel, thereby forming an effective progressive magnetic barrier structure at the end of the magnetic steel slot, so as to reduce the motor noise.

[0070] In some embodiments, the first circular arc 41 and the second circular arc 42 are both located on the edge of the first hollow slot structure 1211 radially outside, and the third circular arc 41' and the fourth circular arc 42' are both located on the edge of the second hollow slot structure 1221 radially outside. When the relationship is met, the effect of reducing the electromagnetic excitation force and torque ripple of the rectangular magnetic barrier slot is better, and the motor vibration can be further optimized.

[0071] In some embodiments, one end of the first circular arc 41 is connected with one vertex of the first magnetic steel 111, and the other end extends to be connected with one end of the second circular arc 42, and the arc radius of the first circular arc 41 is R1, the arc radius of the second circular arc 42 is R2, and R1 < R2.

[0072] One end of the third circular arc 41' is connected with one vertex of the second magnetic steel 112, and the other end extends to be connected with one end of the fourth circular arc 42', and the arc radius of the third circular arc 41' is R1, the arc radius of the fourth circular arc 42' is R2, and R1 < R2.

[0073] When the relationship is met, the torque fluctuation can be optimized, the harmonic can be reduced, the effect of reducing the electromagnetic excitation force and torque ripple of the rectangular magnetic barrier slot is better, and the motor vibration can be further optimized.

[0074] In some embodiments, R1 is 5-7 mm, and R2 is 25-30 mm.

[0075] In some embodiments, the first hollow slot structure 1211 further comprises 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 circular arc 42 and is an extension of the tangent line at the other end of the second circular arc 42, the other end of the first straight line segment 44 is connected to the second straight line segment 45, 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 to the first magnetic steel 111.

[0076] The second hollow slot structure 1221 further comprises 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 circular arc 42' and is an extension of the tangent line at the other end of the fourth circular arc 42', the other end of the fourth straight line segment 44' is connected to the fifth straight line segment 45', 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' is connected to the second magnetic steel 112.

[0077] When the relationship is met, the effect of reducing the electromagnetic exciting force and torque ripple of the magnetic steel slot is better, and the motor vibration can be further optimized.

[0078] In some embodiments, the connection position of the first circular arc 41 and the second circular arc 42 forms a first center line 43 connected to the center of the rotor core 10, the connection position of the third circular arc 41' and the fourth circular arc 42' forms a second center line 43' connected to the center of the rotor core 10, and the first center line 43 and the second center line 43' form an included angle 49. When the relationship is met, the effect of reducing the electromagnetic exciting force and torque ripple of the magnetic steel slot is better, and the motor vibration can be further optimized.

[0079] Figure 5 The load magnetic force line diagram of the motor using the present application is shown in the figure, and the magnetic force line distribution is uniform; Figure 6 The peak electromagnetic force result of the motor using the present application is shown in the figure, and the 48 times frequency peak electromagnetic force is reduced by more than 90%; the torque ripple is reduced to 1.1% at peak working condition, Figure 7 The torque ripple effect diagram of the present application is shown in the figure, and the peak torque ripple is reduced to 1.1%; Figure 8 The noise simulation effect diagram is shown in the figure, and the noise caused by electromagnetic force and torque ripple is greatly reduced.

[0080] The present application also provides a motor, which comprises the motor rotor of any one of the preceding items, and further comprises a motor stator, wherein the motor stator is located at the outer periphery of the motor rotor.

[0081] In some embodiments, the motor stator 5 comprises stator slots 51 arranged in sequence along the circumference, when two of the magnetic barrier slots 21 comprise a first magnetic barrier slot 211 and a second magnetic barrier slot 212, the edge of the first magnetic barrier slot 211 opposite to the second magnetic barrier slot 212 is a first short edge 2111, and the edge of the second magnetic barrier slot 212 opposite to the first magnetic barrier slot 211 is a second short edge 2121, a spacing portion 25 is formed between the first short edge 2111 and the second short edge 2121, the slot opening 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 slot opening 52.

[0082] The first short edge 2111 and the second short edge 2121 form a spacing portion 25, and the slot opening 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 slot opening 52.

[0083] In some embodiments, when the part of the first magnetic steel slot 121 radially outward of the first magnetic steel 111 is a first hollow slot structure 1211, and the edge of the first hollow slot structure 1211 connected to the first magnetic steel 111 comprises a first circular arc 41 and a second circular arc 42; the part of the second magnetic steel slot 122 radially outward of the second magnetic steel 112 is a second hollow slot structure 1221, and the edge of the second hollow slot structure 1221 connected to the second magnetic steel 112 comprises a third circular arc 41' and a fourth circular arc 42',

[0084] and when the joint position of the first circular arc 41 and the second circular arc 42 forms a first center line 43 with the center of the rotor core 10, and the joint position of the third circular arc 41' and the fourth circular arc 42' forms a second center line 43' with the center of the rotor core 10:

[0085] the extension line of the first center line 43 passes through the center of the slot opening 52 of the stator slot 51 opposite to it, and the extension line of the second center line 43' passes through the center of the slot opening 52 of the stator slot 51 opposite to it.

[0086] In some embodiments, the extension line of the first center line 43 passes through the center of the slot opening of the stator slot 51 opposite to it, and the extension line of the second center line 43' passes through the center of the slot opening of the stator slot 51 opposite to it, and the number of slots separated along the circumference between the two centers is Q / (2p)-1, where Q is the total number of stator slots, and p is the number of pole pairs.

[0087] The application can effectively make the connecting points of the two circular arcs in the center of the stator slot, can make the magnetic force lines entering the rotor from the adjacent two stator teeth have a uniform transition, reduce the electromagnetic force change, form the magnetic barrier structure of the rotor pole arc, and also can reduce the electromagnetic excitation force and torque ripple of the motor without affecting the output performance of the motor, thereby reducing the motor noise.

[0088] The application further provides an electric vehicle comprising the motor in any one of the preceding embodiments.

[0089] Those skilled in the art can understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0090] The above description is merely preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above description is merely preferred embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A motor rotor, characterized in that, include: The rotor core (10) is provided with a magnetic steel groove (12) and at least two magnetic barrier grooves (21). The two magnetic barrier grooves (21) are symmetrically arranged with respect to the D-axis of the rotor core (10). The two magnetic barrier grooves (21) are located between the magnetic steel groove (12) and the radial outer edge of the rotor core (10). The magnetic barrier grooves (21) are not connected to the radial outer edge. The cross-section of the magnetic barrier groove (21) is a rectangular groove. The extension lines of the long sides of the two rectangular grooves facing the radial inner side can be fitted with an angle between 0 and 180°, so that the opening of the angle formed between the extension lines of the long sides of the two radial inner side faces the center of the rotor core (10), forming an "inverted V-shaped" magnetic barrier structure. The magnetic steel groove (12) includes a first magnetic steel groove (121) and a second magnetic steel groove (122), and the two magnetic barrier grooves (21) include a first magnetic barrier groove (211) and a second magnetic barrier groove (212). It also includes a magnet (11), which is disposed in the magnet groove (12); The magnet (11) includes a first magnet (111) disposed in the first magnet groove (121) and a second magnet (112) disposed in the second magnet groove (122), wherein the first magnet (111) and the second magnet (112) are both rectangular structures; Both the first magnetic barrier groove (211) and the second magnetic barrier groove (212) are rectangular grooves. The side of the first magnetic barrier groove (211) opposite to the second magnetic barrier groove (212) is the first short side (2111), and 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 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) passes through a vertex of the rectangle of the second magnet (112). 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), and the side of the second magnetic barrier groove (212) that is farthest from the first magnetic barrier groove (211) is the fourth short side (2122). The extension line of the third short side (2112) passes through one long side of the rectangle of the first magnet (111), and the extension line of the fourth short side (2122) passes through one long side of the rectangle of the second magnet (112).

2. The motor rotor according to claim 1, characterized in that: The first magnetic groove (121) and the second magnetic groove (122) are also symmetrically arranged with respect to the D-axis; the first magnetic barrier groove (211) is opposite to the first magnetic groove (121) and located between the first magnetic groove (121) and the radial outer edge of the rotor core (10); the second magnetic barrier groove (212) is opposite to the second magnetic groove (122) and located between the second magnetic groove (122) and the radial outer edge of the rotor core (10).

3. The motor rotor according to claim 1, characterized in that: The extension of the first short side (2111) passes through the vertex of the rectangle of the first magnet (111) closest to the D-axis, and the extension of the second short side (2121) passes through the vertex of the rectangle of the second magnet (112) closest to the D-axis.

4. The motor rotor according to claim 1, characterized in that: The extension of the third short side (2112) passes through the long side of the rectangle of the first magnet (111), which is located on the radially inner side. The extension of the fourth short side (2122) passes through the long side of the rectangle of the second magnet (112), which is located on the radially inner side.

5. The motor rotor according to any one of claims 1-4, characterized in that: The long side of the rectangular magnetic barrier groove (21) ranges from 10 to 12 mm; the short side of the rectangular magnetic barrier groove (21) ranges from 1.5 to 2 mm.

6. The motor rotor according to any one of claims 1-4, characterized in that: The portion of the first magnet groove (121) located radially outside the first magnet (111) is a first hollow groove structure (1211), and the edge of the first hollow groove structure (1211) connected to the first magnet (111) includes a first arc (41) and a second arc (42); the portion of the second magnet groove (122) located radially outside the second magnet (112) is a second hollow groove structure (1221), and the edge of the second hollow groove structure (1221) connected to the second magnet (112) includes a third arc (41') and a fourth arc (42').

7. The motor rotor according to claim 6, characterized in that: The first arc (41) and the second arc (42) are both located on the radially outer side of the first hollow groove structure (1211), and the third arc (41') and the fourth arc (42') are both located on the radially outer side of the second hollow groove structure (1221).

8. The motor rotor according to claim 6, characterized in that: One end of the first arc (41) is connected to one vertex of the first magnet (111), and the other end extends to connect with one end of the second arc (42). The arc radius of the first 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 one vertex of the second magnet (112), and the other end extends to connect with one end of the fourth arc (42'). The radius of the arc of the third arc (41') is R1, and the radius of the arc of the fourth arc (42') is R2, with R1 < R2.

9. The motor rotor according to claim 8, characterized in that: R1 is 5~7mm, and R2 is 25~30mm.

10. The motor rotor according to claim 6, characterized in that: The first hollow groove structure (1211) further includes a first straight segment (44), a second straight segment (45) and a third straight segment (46). One end of the first straight segment (44) is connected to the other end of the second arc (42) and is the extension of the tangent at the other end of the second arc (42). The second straight segment (45) is connected to the other end of the first straight segment (44), and the second straight segment (45) and the third straight segment (46) are connected in sequence. The third straight segment (46) is connected to the first magnet (111). The second hollow groove structure (1221) further includes a fourth straight segment (44'), a fifth straight segment (45'), and a sixth straight segment (46'). One end of the fourth straight segment (44') is connected to the other end of the fourth circular arc (42') and is the extension of the tangent at the other end of the fourth circular arc (42'). The fifth straight segment (45') is connected to the other end of the fourth straight segment (44'), and the fifth straight segment (45') and the sixth straight segment (46') are connected in sequence. The sixth straight segment (46') is connected to the second magnet (112).

11. The motor rotor according to claim 6, characterized in that: The first arc (41) and the second arc (42) meet at the point where they meet, forming a first center line (43) with the center line of the rotor core (10). The third arc (41') and the fourth arc (42') meet at the point where they meet, forming a second center line (43') with the center line of the rotor core (10). An angle (49) is formed between the first center line (43) and the second center line (43').

12. An electric motor, characterized in that: The motor rotor includes any one of claims 1-11, and further includes a motor stator (5) located on the outer periphery of the motor rotor.

13. The motor according to claim 12, characterized in that: The motor stator (5) includes stator slots (51) arranged sequentially at intervals along the circumference. When the two magnetic barrier slots (21) include a first magnetic barrier slot (211) and a second magnetic barrier slot (212), and the side of the first magnetic barrier slot (211) opposite to the second magnetic barrier slot (212) is the first short side (2111), and the side of the second magnetic barrier slot (212) opposite to the first magnetic barrier slot (211) is the second short side (2121): A gap portion (25) is formed between the first short side (2111) and the second short side (2121). The slot opening (52) of the stator slot (51) is opposite to the gap portion (25), and the width of the gap portion (25) is greater than the width of the slot opening (52).

14. The motor according to claim 13, characterized in that: When the portion of the first magnet groove (121) located radially outside the first magnet (111) is a first hollow groove structure (1211), and the edge of the first hollow groove structure (1211) connected to the first magnet (111) includes a first arc (41) and a second arc (42); when the portion of the second magnet groove (122) located radially outside the second magnet (112) is a second hollow groove structure (1221), and the edge of the second hollow groove structure (1221) connected to the second magnet (112) includes a third arc (41') and a fourth arc (42'). And when the contact point of the first arc (41) and the second arc (42) forms a first center line (43) with the center line of the rotor core (10), and the contact point of the third arc (41') and the fourth arc (42') forms a second center line (43') with the center line of the rotor core (10): The extension of the first center line (43) passes through the center of the slot opening (52) of the stator slot (51) opposite to it, and the extension of the second center line (43') passes through the center of the slot opening (52) of the stator slot (51) opposite to it.

15. The motor according to claim 14, characterized in that: The number of slots circumferentially separated between the extension of the first center line (43) passing through the center of the slot opening of the stator slot (51) opposite to it and the extension of the second center line (43') passing through the center of the slot opening of the stator slot (51) opposite to it is Q / (2p)-1, where Q is the total number of stator slots and p is the number of pole pairs.

16. An electric vehicle, characterized in that: The motor comprising any one of claims 12-15.

Images