A motor rotor and a permanent magnet assisted synchronous reluctance motor

Abstract

The application relates to the field of electric machines, and provides an electric machine rotor and a permanent magnet auxiliary synchronous reluctance electric machine. The electric machine rotor comprises a rotor body, and an installation groove for installing a permanent magnet is arranged on the axial end face of the rotor body; the outer circumferential surface of the rotor body is provided with a groove, the end part of the installation groove close to the outer circumferential surface is provided with a concave-convex structure, the concave part of the concave-convex structure is arranged opposite to the groove, and a bent magnetic isolation bridge is formed between the end part of the installation groove and the outer circumferential surface of the rotor body. In this way, by arranging the bent magnetic isolation bridge, the magnetic resistance distribution of each part of the electric machine magnetic circuit is changed, the electric machine tooth slot effect is reduced, the magnetic flux direction is improved, the electric machine torque ripple is reduced, the electric machine electromagnetic force peak value is reduced, and the electric machine electromagnetic vibration noise is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electric machines, in particular to an electric machine rotor and a permanent magnet assisted synchronous reluctance machine. BACKGROUND

[0002] The permanent magnet assisted synchronous reluctance machine combines the synchronous reluctance machine and the built-in permanent magnet synchronous machine, fully utilizes the reluctance torque and the permanent magnet torque, and is widely used in various fields. In the related art, the structure of the electric machine rotor of the permanent magnet assisted synchronous reluctance machine is unreasonable, resulting in a large electromagnetic force peak value of the permanent magnet assisted synchronous reluctance machine, and a large motor torque ripple and vibration noise. SUMMARY

[0003] To solve the technical problems of a large electromagnetic force peak value of the permanent magnet assisted synchronous reluctance machine, and a large motor torque ripple and vibration noise in the related art, the present application provides an electric machine rotor and a permanent magnet assisted synchronous reluctance machine.

[0004] According to one aspect of the present application, an electric machine rotor is provided, comprising: a rotor body, an installation groove for installing a permanent magnet is arranged on an axial end face of the rotor body; wherein an outer peripheral surface of the rotor body has a groove, an end portion of the installation groove close to the outer peripheral surface has a concave-convex structure, a concave portion of the concave-convex structure is arranged opposite to the groove, so as to form a bent magnetic isolation bridge between the end portion of the installation groove and the outer peripheral surface of the rotor body.

[0005] Further, a convex portion of the concave-convex structure and the outer peripheral surface form a first magnetic isolation segment; the concave portion and the groove form a second magnetic isolation segment; the convex portion and the groove form a third magnetic isolation segment, the third magnetic isolation segment is connected between the first magnetic isolation segment and the second magnetic isolation segment; the first magnetic isolation segment, the third magnetic isolation segment and the second magnetic isolation segment jointly form the bent magnetic isolation bridge.

[0006] Further, the first magnetic isolation segment and the second magnetic isolation segment both extend along the circumference of the rotor body, and the third magnetic isolation segment extends along the radial direction of the rotor body.

[0007] Further, the thicknesses of the first magnetic isolation segment, the second magnetic isolation segment and the third magnetic isolation segment are uniformly arranged; and / or the thickness of the first magnetic isolation segment is uniform and is D, the thickness of the second magnetic isolation segment is uniform and is E, and the thickness of the third magnetic isolation segment is uniform and is I, wherein D>E, D>I, and 0.2≤D.

[0008] Further, the included angle between the second and third magnetic isolation segments is obtuse; or the included angle between the second and third magnetic isolation segments is greater than or equal to 100° and less than or equal to 150°; or the included angle between the first and third magnetic isolation segments is equal to the included angle between the second and third magnetic isolation segments; or the included angle between the second and third magnetic isolation segments is acute; or the first, second and third magnetic isolation segments are arranged in a Z shape.

[0009] Further, the middle of the slot section in the axial direction of the rotor body is arranged close to the center of the rotor body, both ends of the slot section are arranged close to the outer periphery of the rotor body, both ends of the mounting slot have a concave-convex structure; the concave groove is a plurality of, one concave groove is arranged at each end of the mounting slot to form a bent magnetic isolation bridge at each end of the mounting slot.

[0010] Further, the plurality of mounting slots are arranged along the circumferential direction of the rotor body, the concave groove is a plurality of, each end of the concave portion of the mounting slot corresponds to one concave groove to form a plurality of bent magnetic isolation bridges at the ends of the plurality of mounting slots; or the plurality of mounting slots are arranged along the radial direction of the rotor body, the concave groove is a plurality of, each end of the concave portion of the mounting slot corresponds to one concave groove to form a plurality of bent magnetic isolation bridges at the ends of the plurality of mounting slots; or the plurality of mounting slots are arranged along the radial direction of the rotor body and form a group of mounting slot groups, the plurality of mounting slot groups are arranged along the circumferential direction of the rotor body, the concave groove is a plurality of, each end of the concave portion of the mounting slot corresponds to one concave groove to form a plurality of bent magnetic isolation bridges at the ends of the plurality of mounting slot groups; or the plurality of mounting slots are arranged along the radial direction of the rotor body and form a group of mounting slot groups, the plurality of mounting slot groups are arranged along the circumferential direction of the rotor body, the plurality of mounting slots in a group of mounting slot groups are arranged symmetrically along the magnetic pole center line, the adjacent two groups of mounting slot groups are arranged symmetrically along the magnetic pole boundary line, the concave groove is a plurality of, the concave portions at the ends of the two mounting slots in the inner layer of the adjacent two groups of mounting slot groups correspond to one concave groove, the concave portions at the ends of the two mounting slots in the outer layer of the adjacent two groups of mounting slot groups correspond to one concave groove respectively to form a plurality of bent magnetic isolation bridges at the ends of the plurality of mounting slots in the plurality of mounting slot groups; or the plurality of mounting slots are arranged along the circumferential direction of the rotor body, each mounting slot is arranged symmetrically along the magnetic pole center line, the adjacent two mounting slots are arranged symmetrically along the magnetic pole boundary line, the two concave portions at the ends of the adjacent two mounting slots correspond to one concave groove to form a plurality of bent magnetic isolation bridges at the ends of the plurality of mounting slots; or the concave-convex structure of the mounting slot includes one convex portion and one concave portion, the magnetic isolation bridge is arranged in a Z shape; or the concave-convex structure of the mounting slot includes one convex portion and two concave portions, the convex portion is located between the two concave portions, the concave groove is a plurality of, the two concave portions correspond to one concave groove respectively; or the concave-convex structure of the mounting slot includes a plurality of convex portions and a plurality of concave portions, the concave groove is a plurality of, the plurality of convex portions correspond to one concave groove.

[0011] Further, the plurality of layers of installation slots are arranged radially along the rotor body to form a plurality of groups of installation slots; adjacent two layers of installation slots in one group of installation slots include an inner layer of installation slots close to the center of the rotor body and an outer layer of installation slots close to the outer periphery of the rotor body; the plurality of grooves are arranged circumferentially along the rotor body, and the plurality of grooves include first grooves corresponding to the inner layer of installation slots and second grooves corresponding to the outer layer of installation slots; wherein the width of the first grooves is greater than the width of the second grooves; or the width of the first grooves along the circumferential direction of the rotor body is K, and the width of the second grooves along the circumferential direction of the rotor body is L, wherein 1.2≤K / L≤2.5.

[0012] Further, the plurality of layers of installation slots are arranged radially along the rotor body to form a plurality of groups of installation slots; adjacent two layers of installation slots in one group of installation slots include an inner layer of installation slots close to the center of the rotor body and an outer layer of installation slots close to the outer periphery of the rotor body; the plurality of grooves are arranged circumferentially along the rotor body, and the plurality of grooves include first grooves corresponding to the inner layer of installation slots and second grooves corresponding to the outer layer of installation slots, the first grooves and the inner layer of installation slots form a first bent magnetic isolation bridge, and the second grooves and the outer layer of installation slots form a second bent magnetic isolation bridge; wherein the bending directions of the bending positions between the first bent magnetic isolation bridge and the second bent magnetic isolation bridge are opposite; or the bending position of the first magnetic isolation bridge is an acute angle, and the bending position of the second magnetic isolation bridge is an obtuse angle; or the included angle of the bending position of the first magnetic isolation bridge is M, and the included angle of the bending position of the second magnetic isolation bridge is J, wherein 0°<M<90°, 90°<J<180°, 0.3≤M / J≤0.9.

[0013] According to another aspect of the present application, the present application also provides a permanent magnet assisted synchronous reluctance motor, which comprises the motor rotor described above.

[0014] By arranging the bent magnetic isolation bridge, the technical scheme of the present application changes the magnetic resistance distribution of each part of the motor magnetic circuit, reduces the tooth slot effect of the motor, improves the magnetic flux direction, reduces the torque ripple of the motor, reduces the electromagnetic force peak value of the motor, and reduces the electromagnetic vibration noise of the motor. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 A structure schematic diagram of a rotor body of a motor rotor in the prior art is shown;

[0016] Figure 2 A structure schematic diagram of a rotor body of a motor rotor in an optional embodiment of the present application is shown;

[0017] Figure 3 An assembly structure schematic diagram of a rotor body and a permanent magnet of a motor rotor in an optional embodiment of the present application is shown;

[0018] Figure 4 It shows Figure 3 Enlarged view of point A in the middle;

[0019] Figure 5 A schematic diagram of the assembly structure of the rotor body and permanent magnet of a motor rotor according to another optional embodiment of the present invention is shown.

[0020] Figure 6 It shows Figure 5 Enlarged view of point B in the middle;

[0021] Figure 7 A schematic diagram of the assembly structure of the rotor body and permanent magnet of a motor rotor according to another optional embodiment of the present invention is shown.

[0022] Figure 8 A partial structural schematic diagram of the rotor body of an electric motor rotor according to another alternative embodiment of the present invention is shown;

[0023] Figure 9 It shows Figure 1 A schematic diagram comparing the torque pulsation of a conventional motor and the novel motor provided in this application;

[0024] Figure 10 It shows Figure 1 A schematic diagram comparing the electromagnetic forces of a conventional motor and the novel motor provided in this application;

[0025] Figure 11 It shows Figure 1 A schematic diagram comparing the total motor noise of a conventional motor with that of the novel motor provided in this application.

[0026] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention.

[0027] In the attached diagram:

[0028] 10. Rotor body; 11. Mounting slot; 110. Mounting slot group; 111. Recess; 112. Protrusion; 100. Inner mounting slot; 200. Outer mounting slot; 12. Groove; 121. First groove; 122. Second groove; 123. Third groove; 120. Magnetic isolation bridge; 1. First magnetic isolation section; 2. Second magnetic isolation section; 3. Third magnetic isolation section; 4. First magnetic isolation bridge; 5. Second magnetic isolation bridge; 13. Inner hole; 20. Permanent magnet; 21. Inner permanent magnet; 22. Outer permanent magnet. Detailed Implementation

[0029] In the following, the technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings of the embodiments of the present application, so that those skilled in the art can better understand the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the protection scope of the present application.

[0030] In order to solve the technical problems of large electromagnetic force peak value, large motor torque ripple and large vibration noise of the motor rotor and the permanent magnet auxiliary synchronous reluctance motor in the related art, the present application provides a motor rotor and a permanent magnet auxiliary synchronous reluctance motor.

[0031] As shown in Figure 1 , the outer peripheral surface of the rotor body of the motor rotor of the conventional motor in the related art is a complete circle, and the conventional motor has problems of large electromagnetic force peak value, large motor torque ripple and large vibration noise.

[0032] As shown in Figures 2 to 8 , the present application provides a motor rotor, which comprises: a rotor body 10, an installation groove 11 for installing a permanent magnet 20 is arranged on the axial end face of the rotor body 10; wherein the outer peripheral surface of the rotor body 10 has a groove 12, the end portion of the installation groove 11 close to the outer peripheral surface has a concave-convex structure, the concave portion 112 of the concave-convex structure is arranged opposite to the groove 12, so as to form a bent magnetic isolation bridge 120 between the end portion of the installation groove 11 and the outer peripheral surface of the rotor body 10. The present application changes the magnetic resistance distribution of each part of the motor magnetic circuit by arranging the bent magnetic isolation bridge 120, reduces the cogging effect of the motor, improves the magnetic flux direction, reduces the torque ripple of the motor, reduces the electromagnetic force peak value of the motor, and reduces the electromagnetic vibration noise of the motor.

[0033] As shown in Figures 9 to 11 , according to the test comparison, the new motor using the motor rotor provided by the present application can reduce the torque ripple of the motor, reduce the electromagnetic force peak value of the motor, and reduce the electromagnetic vibration noise of the motor. The performance of the motor using the motor rotor provided by the present application is better.

[0034] As shown in Figure 3 and Figure 4As shown, the convex part 111 of the concave-convex structure and the outer circumferential surface form a first magnetic isolation section 1; the concave part 112 and the groove 12 form a second magnetic isolation section 2; the convex part 111 and the groove 12 form a third magnetic isolation section 3, which is connected between the first magnetic isolation section 1 and the second magnetic isolation section 2; the first magnetic isolation section 1, the third magnetic isolation section 3 and the second magnetic isolation section 2 together form a bent magnetic isolation bridge 120. In this way, the air gap width of the surface of the motor rotor in the circumferential direction is non-uniform, and at the same time the magnetic lines pass along the magnetic isolation bridge 120, while limiting the number of magnetic lines passing through from here, thereby further improving the magnetic flux direction, further reducing the electromagnetic force peak value of the motor, and reducing the electromagnetic vibration noise of the motor.

[0035] Optionally, the first magnetic isolation section 1 and the second magnetic isolation section 2 both extend along the circumferential direction of the rotor body 10, and the third magnetic isolation section 3 extends along the radial direction of the rotor body 10.

[0036] Optionally, the thicknesses of the first magnetic isolation section 1, the second magnetic isolation section 2 and the third magnetic isolation section 3 are uniformly set.

[0037] Optionally, the thickness of the first magnetic isolation section 1 is uniform and is D, the thickness of the second magnetic isolation section 2 is uniform and is E, and the thickness of the third magnetic isolation section 3 is uniform and is I, wherein D>E, D>I, and 0.2E+I≤D. In this way, the magnetic resistance distribution of the air gap at each part of the circumferential surface of the motor rotor can be improved, the air gap magnetic field distribution can be improved, the magnetic flux direction can be improved, the harmonics can be reduced, the torque ripple of the motor can be reduced, the electromagnetic force peak value of the motor can be reduced, and the electromagnetic vibration noise of the motor can be reduced.

[0038] Optionally, the included angle between the second magnetic isolation section 2 and the third magnetic isolation section 3 is an obtuse angle. In this way, the bending angle is increased, the magnetic flux direction is improved while the process processing difficulty is reduced, the processing cost of the rotor body is reduced, and at the same time the motor has smaller torque ripple.

[0039] Optionally, the included angle between the second magnetic isolation section 2 and the third magnetic isolation section 3 is greater than or equal to 100° and less than or equal to 150°. When the included angle between the second magnetic isolation section 2 and the third magnetic isolation section 3 is within the above numerical range, the effects of improving the magnetic flux direction and reducing the process processing difficulty are better.

[0040] Optionally, the included angle between the first magnetic isolation section 1 and the third magnetic isolation section 3 is equal to the included angle between the second magnetic isolation section 2 and the third magnetic isolation section 3.

[0041] Optionally, the included angle between the second magnetic isolation section 2 and the third magnetic isolation section 3 is an acute angle.

[0042] Optionally, the first magnetic isolation section 1, the third magnetic isolation section 3, and the second magnetic isolation section 2 are arranged in a Z-shape. The Z-shaped magnetic isolation bridge makes the air gap width on the rotor surface uneven along the circumferential direction. At the same time, the magnetic lines of force are transmitted along the Z-shaped magnetic isolation bridge, while limiting the number of magnetic lines of force passing through this area, thereby further improving the magnetic flux direction, further reducing the peak electromagnetic force of the motor, and reducing the electromagnetic vibration noise of the motor.

[0043] Optionally, the mounting groove 11 is located in the middle of the groove section along the axial direction of the rotor body 10, close to the center of the rotor body 10, and both ends of the groove section are located close to the outer periphery of the rotor body 10. Both ends of the mounting groove 11 have concave and convex structures. There are multiple grooves 12, and each end of the mounting groove 11 is provided with a corresponding groove 12, so as to form a bent magnetic bridge 120 at each end of the mounting groove 11.

[0044] Optionally, the mounting groove 11 is arranged in a tile shape.

[0045] Optionally, the permanent magnet 20 is made of ferrite material.

[0046] Optionally, multiple mounting slots 11 are spaced apart along the circumference of the rotor body 10, and multiple grooves 12 are provided. Each mounting slot 11 has a corresponding groove 12 at its end, so as to form multiple bent magnetic bridges 120 at the ends of the multiple mounting slots 11.

[0047] Optionally, the multi-layer mounting grooves 11 are arranged at radial intervals along the rotor body 10, and there are multiple grooves 12. Each mounting groove 11 has a corresponding groove 12 at the end of its recess 112, so as to form multiple bent magnetic isolation bridges 120 at the end of the multi-layer mounting grooves 11.

[0048] like Figure 2 As shown, the multi-layer mounting slot 11 is a double-layer mounting slot 11. The inner layer mounting slot 11 is equipped with an inner permanent magnet 21, and the outer layer mounting slot 11 is equipped with an outer permanent magnet 22. The inner and outer layer mounting slots 11 form a "Z"-shaped magnetic isolation bridge with the outer circle of the rotor, which further improves the magnetic flux passing through these two magnetic isolation bridges, further improves the air gap magnetic field distribution, reduces the harmonics of the air gap magnetic flux density, reduces the peak value of the motor frequency doubling electromagnetic force, and reduces the electromagnetic vibration noise of the motor.

[0049] Optionally, such as Figures 3 to 5 As shown, the multi-layer mounting grooves 11 are arranged radially at intervals along the rotor body 10, forming a set of mounting groove groups 110. Multiple sets of mounting groove groups 110 are arranged circumferentially at intervals along the rotor body 10. There are multiple grooves 12, and each mounting groove 11 has a corresponding groove 12 at its end, so as to form multiple bent magnetic isolation bridges 120 at the ends of the multi-layer mounting grooves 11 of the multiple sets of mounting groove groups 110.

[0050] Optionally, the permanent magnets 20 installed in a set of mounting slots 110 have the same polarity.

[0051] Optionally, such as Figure 7 As shown, multi-layer mounting slots 11 are arranged radially at intervals along the rotor body 10, forming a set of mounting slot groups 110. Multiple sets of mounting slot groups 110 are arranged circumferentially at intervals along the rotor body 10. The multi-layer mounting slots 11 within a set of mounting slot groups 110 are symmetrically arranged along the magnetic pole center line. Adjacent sets of mounting slot groups 110 are symmetrically arranged along the magnetic pole boundary line. There are multiple grooves 12. The recesses 112 at the ends of the two mounting slots 11 in the inner layer of two adjacent sets of mounting slot groups 110 correspond to a groove 12. The recesses 112 at the ends of the two mounting slots 11 in the outer layer of two adjacent sets of mounting slot groups 110 correspond to a groove 12, so as to form multiple bent magnetic isolation bridges 120 at the ends of the multi-layer mounting slots 11 in the multiple sets of mounting slot groups 110.

[0052] exist Figure 7 In the illustrated embodiment, the plurality of grooves 12 include second grooves 122 and third grooves 123. The recesses 112 at the ends of the two inner mounting grooves 11 in two adjacent sets of mounting groove groups 110 correspond to one third groove 123, and the recesses 112 at the ends of the two outer mounting grooves 11 in two adjacent sets of mounting groove groups 110 each correspond to one second groove 122. Thus, the third groove 123 and the ends of the inner mounting grooves 11 on both sides of the magnetic pole boundary line form a "Z"-shaped magnetic isolation bridge, further increasing the magnetic resistance at the magnetic pole boundary line, reducing torque pulsation, further improving the sinusoidal nature of the air gap magnetic flux density waveform, reducing harmonics, reducing the electromagnetic force amplitude, reducing the 2np harmonic electromagnetic force, and reducing vibration noise.

[0053] Optionally, multiple mounting slots 11 are spaced apart circumferentially along the rotor body 10, each mounting slot 11 is symmetrically arranged along the magnetic pole center line, two adjacent mounting slots 11 are symmetrically arranged along the magnetic pole boundary line, and two recesses 112 at the ends of two adjacent mounting slots 11 correspond to a groove 12, so as to form multiple bent magnetic isolation bridges 120 at the ends of multiple mounting slots 11.

[0054] Optionally, such as Figures 2 to 7 As shown, the mounting groove 11 has a convex-concave structure including a convex part 111 and a concave part 112, and the magnetic bridge 120 is arranged in a Z-shape.

[0055] Optionally, such as Figure 8 As shown, the mounting groove 11 has a concave-convex structure including a protrusion 111 and two concave parts 112. The protrusion 111 is located in the middle of the two concave parts 112. There are multiple grooves 12, and each of the two concave parts 112 corresponds to one groove 12.

[0056] Optionally, in an optional embodiment not shown in the drawings, the concave-convex structure of the mounting groove 11 comprises a plurality of convex portions 111 and a plurality of concave portions 112, and the plurality of grooves 12 are provided.

[0057] Optionally, as shown in Figure 5 and Figure 6 , a plurality of the mounting grooves 11 are arranged along the radial direction of the rotor body 10 to form a group of mounting groove groups 110; adjacent two layers of the mounting grooves 11 in the group of mounting groove groups 110 comprise an inner layer mounting groove 100 close to the center of the rotor body 10 and an outer layer mounting groove 200 close to the outer periphery of the rotor body 10; the plurality of grooves 12 are arranged along the circumferential direction of the rotor body 10, and the plurality of grooves 12 comprise a first groove 121 corresponding to the inner layer mounting groove 100 and a second groove 122 corresponding to the outer layer mounting groove 200; wherein the width of the first groove 121 is greater than the width of the second groove 122; or the width of the first groove 121 along the circumferential direction of the rotor body 10 is K, and the width of the second groove 122 along the circumferential direction of the rotor body 10 is L, wherein 1.2≤K / L≤2.5. In this way, the magnetic conductance of the magnetic circuit at each position in the circumferential direction of the rotor magnetic pole can be made more uniform, the air gap magnetic field distribution can be better improved, the air gap flux density harmonics can be reduced, the torque ripple can be reduced, and the motor electromagnetic vibration noise can be reduced.

[0058] Optionally, as shown in Figure 5 and Figure 6As shown, the multi-layer mounting slots 11 are arranged radially along the rotor body 10 to form a set of mounting slot groups 110; two adjacent mounting slots 11 in a set of mounting slot groups 110 include an inner layer mounting slot 100 close to the center of the rotor body 10 and an outer layer mounting slot 200 close to the outer periphery of the rotor body 10; the grooves 12 are a plurality of grooves 12, and the plurality of grooves 12 are arranged circumferentially along the rotor body 10, the plurality of grooves 12 include a first groove 121 corresponding to the inner layer mounting slot 100 and a second groove 122 corresponding to the outer layer mounting slot 200, the first groove 121 and the inner layer mounting slot 100 form a bent first magnetic bridge 4, and the second groove 122 and the outer layer mounting slot 200 form a bent second magnetic bridge 5; wherein the bending directions of the bending portions between the bent first magnetic bridge 4 and the bent second magnetic bridge 5 are opposite; or the bending portion of the first magnetic bridge 4 is an acute angle, and the bending portion of the second magnetic bridge 5 is an obtuse angle; or the included angle of the bending portion of the first magnetic bridge 4 is M, and the included angle of the bending portion of the second magnetic bridge 5 is J, wherein 0° < M < 90°, 90° < J < 180°, and 0.3 ≤ M / J ≤ 0.9. In this way, the first magnetic bridge 4 and the second magnetic bridge 5 guide the magnetic flux to different directions, and the combination of the first magnetic bridge 4 and the second magnetic bridge 5 can make the magnetic conductance of the magnetic circuit at each position in the circumferential and radial directions more uniform, better improve the air gap magnetic field, reduce the harmonic of the air gap flux density, reduce the harmonic ratio of the counter electromotive force, reduce the peak value of the electromagnetic force, and reduce the electromagnetic vibration noise of the motor.

[0059] The application also provides a permanent magnet assisted synchronous reluctance motor, which comprises the motor rotor described above and below. The motor has low vibration noise.

[0060] The rotor of the permanent magnet assisted synchronous reluctance motor is usually made of a permanent magnet made of rare earth neodymium iron boron material. However, since rare earth is an important strategic reserve material, the production of rare earth material is limited due to the influence of upstream raw material control, and the price is relatively high. At present, the permanent magnet made of ferrite material has a great development space due to its high cost performance advantage.

[0061] In Figure 3In the shown specific embodiment, the rotor body 10 is provided with an installation groove 11 for placing the permanent magnet 20, the motor rotor comprises the rotor body 10 and the permanent magnet 20 placed in the installation groove 11, the motor rotor comprises N layers of permanent magnets 20 on the same magnetic pole, N≥2, the permanent magnets 20 in the same magnetic pole have the same polarity towards the stator, the installation groove 11 has a shape protruding towards the inside of the rotor, the center of the installation groove 11 is close to the inside of the rotor, the two ends of the installation groove 11 are close to the outer circle of the rotor, the outer circle of the rotor is the outside of the rotor, the inner hole 13 of the rotor is the inside of the rotor, the end of the installation groove 11 has a concave-convex structure, that is, the groove depth of the end of the installation groove 11 is not equal, there are deep groove sections and shallow groove sections, the surface of the outer circle of the rotor has a groove 12, so that a magnetic isolation bridge with a bend is formed between the end of the installation groove 11 and the outer circle of the rotor, the magnetic isolation bridge is in the shape of "Z". By setting the "Z"-shaped magnetic isolation bridge outside the installation groove 11, the magnetic resistance distribution of each part of the motor magnetic circuit is changed, the tooth slot effect of the motor can be reduced, the magnetic flux direction can be improved, the torque ripple of the motor can be reduced, the electromagnetic force peak value of the motor can be reduced, and the electromagnetic vibration noise of the motor can be reduced. The "Z"-shaped magnetic isolation bridge has at least three sections, which are a first section extending along the circumference close to the outer circle of the rotor, a second section extending along the circumference close to the installation groove 11, and a third section extending along the radial direction connecting the first section and the second section. The "Z"-shaped magnetic isolation bridge makes the air gap width of the rotor surface uneven along the circumferential direction, and at the same time, the magnetic force lines pass along the "Z"-shaped magnetic isolation bridge, and at the same time, the number of magnetic force lines passing through is limited, thereby further improving the magnetic flux direction, further reducing the electromagnetic force peak value of the motor, and reducing the electromagnetic vibration noise of the motor. The thicknesses of the first section, the second section and the third section of the "Z"-shaped magnetic isolation bridge are uniform, the thickness of the first section is greater than the thickness of the second section, and the thickness of the first section is greater than the thickness of the third section. The thickness of the first section is D, the thickness of the second section is E, and the thickness of the third section is I, and D, E and I satisfy the following relationship: 0.2(E+I)≤D, thereby improving the magnetic resistance distribution of the air gap at each part of the rotor circumferential surface, improving the air gap magnetic field distribution, improving the magnetic flux direction, reducing harmonics, reducing the torque ripple of the motor, reducing the electromagnetic force peak value of the motor, and reducing the electromagnetic vibration noise of the motor. The outer end of the inner and outer installation grooves 11 close to the outer surface of the rotor is provided with a groove on the outer surface of the rotor, the groove on the outer surface of the rotor on the outer side of the inner installation groove 11 is a first groove, and the groove on the outer surface of the rotor on the outer side of the outer installation groove 11 is a second groove, so that the "Z"-shaped magnetic isolation bridge is formed between the inner and outer installation grooves 11 and the outer circle of the rotor, further improving the magnetic flux passing through the two bridges, further improving the air gap magnetic field distribution, reducing the harmonics of the air gap magnetic density, reducing the motor frequency electromagnetic force peak value, and reducing the motor electromagnetic vibration noise.

[0062] In Figure 5In the preferred embodiment shown, an obtuse angle is formed between the second segment of the magnetic isolation bridge and the third segment of the magnetic isolation bridge, the angle is set as J, 100°≤J≤150°, the bending angle is increased, the magnetic flux direction is improved, the process processing difficulty is reduced, the rotor processing cost is reduced, and the motor has smaller torque ripple.

[0063] In Figure 5 In the preferred embodiment shown, the width of the first groove 121 of the rotor outer surface is greater than the width of the second groove 122, the width of the first groove 121 on the rotor surface is set as K, the width of the second groove 122 on the rotor surface is set as L, K, L satisfy the following relationship: 1.2≤K / L≤2.5, which can make the magnetic conductance of the magnetic pole of the rotor more uniform in the circumferential direction, better improve the air gap magnetic field distribution, reduce the harmonic of the air gap magnetic density, reduce the torque ripple, and reduce the electromagnetic vibration noise of the motor.

[0064] In Figure 5 In the preferred embodiment shown, the first "Z" type magnetic isolation bridge is formed on the outer side of the rotor surface of the inner layer mounting groove 11, the second "Z" type magnetic isolation bridge is formed on the outer side of the rotor surface of the outer layer mounting groove 11, the bending part of the first "Z" type magnetic isolation bridge is an obtuse angle, the bending part of the second "Z" type magnetic isolation bridge is an acute angle, the angle of the bending part of the second "Z" type magnetic isolation bridge is set as M, M, J satisfy the following relationship: 0.3≤M / J≤0.9, the first magnetic isolation bridge 4 and the second magnetic isolation bridge 5 are different in the extension direction of the rotor circumferential direction, the magnetic flux direction is different, the first magnetic isolation bridge 4 and the second magnetic isolation bridge 5 can make the magnetic conductance of the magnetic pole of the rotor more uniform in the circumferential and radial directions, better improve the air gap magnetic field, reduce the harmonic of the air gap magnetic density, reduce the proportion of the back electromotive force harmonic, reduce the electromagnetic force peak value, and reduce the electromagnetic vibration noise of the motor.

[0065] In Figure 7 In the preferred embodiment shown, the rotor surface groove at both ends of the mounting groove 11 and the "Z" type magnetic isolation bridge are symmetrical about the magnetic pole center line, the rotor poles are symmetrical, the outer side of two adjacent inner layer mounting grooves 11 forms a groove, which is set as a third groove 123, the outer end of the inner layer mounting groove 11 on both sides of the magnetic pole boundary line forms a "Z" type magnetic isolation bridge, which further increases the magnetic resistance at the magnetic pole boundary line, reduces the torque ripple, further improves the sine degree of the air gap magnetic density waveform, reduces the harmonic, reduces the electromagnetic force amplitude, reduces the 2np times frequency electromagnetic force, and reduces the vibration noise.

[0066] The application provides a novel motor rotor structure, which can effectively improve the magnetic flux direction, thereby reducing the proportion of various harmonics of the air gap magnetic flux waveform, reducing the motor torque ripple, reducing the electromagnetic force amplitude, and reducing the motor electromagnetic vibration noise.

[0067] The above specifically shows and describes the exemplary embodiments of the present disclosure. It should be understood that the present disclosure is not limited to the detailed structure, arrangement or implementation described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent arrangements included in the spirit and scope of the appended claims.

[0068] It should be noted that the terms used herein are only for the purpose of describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, the singular form is intended to include the plural form unless the context clearly indicates otherwise, and it should also be understood that when the terms "comprise" and / or "include" are used in the specification, there is a feature, step, operation, device, component and / or combination thereof.

[0069] Unless otherwise specifically stated, the relative arrangements, numerical expressions and values of the components and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that the sizes of the various parts shown in the drawings are not drawn in proportion to the actual proportions. The techniques, methods and devices known to those skilled in the relevant art can not be discussed in detail, but should be considered as part of the authorized specification, if appropriate. In all examples shown and discussed herein, any specific value should be interpreted as merely exemplary, and not as a limitation. Therefore, other examples of exemplary embodiments can have different values. It should be noted that similar reference numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0070] In the description of the present application, it should be understood that the orientation words such as "front, rear, upper, lower, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate and imply that the indicated device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore it cannot be understood as a limitation on the scope of protection of the present application; the orientation words "inner, outer" refer to the inner and outer relative to the contour of each component.

[0071] For purposes of the description hereinafter, the terms "upper", "lower", "right", "left", "vertical", "horizontal", "top", "bottom", "lateral", "medial", "superior", "inferior", "proximal", "distal" and derivatives thereof shall relate to the application as it is shown in the drawings and as they are oriented on the figures. However, it is to be understood that the application can assume various alternative orientations and, accordingly, such terms are not to be taken as limitations of the present application or any embodiments thereof described herein or is shown in the drawings.

[0072] It is to be understood that the terminology used herein is for the purpose of describing the present application and the terms should not be regarded as limiting. Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present disclosure, and will not be interpreted in an overly literal or overly formal sense unless expressly so defined herein.

[0073] The above description is embodied only to explain the preferred embodiments of the present application and is not intended to limit the present application. The present application can be variously changed and modified by those skilled in the art without departing from the spirit and scope of the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of the present application.

Claims

1. A motor rotor, characterized in that, include: The rotor body (10) has an mounting groove (11) on its axial end face for mounting a permanent magnet (20). The outer peripheral surface of the rotor body (10) has a groove (12), and the end of the mounting groove (11) near the outer peripheral surface has a concave-convex structure. The concave part (112) of the concave-convex structure is arranged opposite to the groove (12) to form a bent magnetic bridge (120) between the end of the mounting groove (11) and the outer peripheral surface of the rotor body (10). A first magnetic isolation segment (1) is formed between the protrusion (111) of the concave-convex structure and the outer peripheral surface. A second magnetic shielding segment (2) is formed between the recess (112) and the groove (12). A third magnetic isolation segment (3) is formed between the protrusion (111) and the groove (12), and the third magnetic isolation segment (3) is connected between the first magnetic isolation segment (1) and the second magnetic isolation segment (2); The first magnetic isolation segment (1), the third magnetic isolation segment (3) and the second magnetic isolation segment (2) together form the bent magnetic isolation bridge (120). The thicknesses of the first magnetic shielding segment (1), the second magnetic shielding segment (2), and the third magnetic shielding segment (3) are all uniformly set; or The thickness of the first magnetic isolation segment (1) is uniform and is D, the thickness of the second magnetic isolation segment (2) is uniform and is E, and the thickness of the third magnetic isolation segment (3) is uniform and is I, where D > E, D > I, and 0.2(E+I) ≤ D.

2. The motor rotor according to claim 1, characterized in that, The first magnetic isolation section (1) and the second magnetic isolation section (2) both extend circumferentially along the rotor body (10), and the third magnetic isolation section (3) extends radially along the rotor body (10).

3. The motor rotor according to claim 1, characterized in that, The angle between the second magnetic shielding segment (2) and the third magnetic shielding segment (3) is an obtuse angle; or The angle between the second magnetic shielding segment (2) and the third magnetic shielding segment (3) is greater than or equal to 100° and less than or equal to 150°; or The angle between the first magnetic shielding segment (1) and the third magnetic shielding segment (3) is equal to the angle between the second magnetic shielding segment (2) and the third magnetic shielding segment (3); or The angle between the second magnetic shielding segment (2) and the third magnetic shielding segment (3) is an acute angle; or The first magnetic shielding section (1), the third magnetic shielding section (3) and the second magnetic shielding section (2) are arranged in a Z-shape.

4. The motor rotor according to claim 1, characterized in that, The mounting groove (11) is located in the middle of the groove section in the axial direction of the rotor body (10) near the center of the rotor body (10), and both ends of the groove section are located near the outer periphery of the rotor body (10). Both ends of the mounting groove (11) have the concave-convex structure. There are multiple grooves (12), and each of the two ends of the mounting groove (11) is provided with a groove (12) to form a bent magnetic bridge (120) at each end of the mounting groove (11).

5. The motor rotor according to claim 1, characterized in that, Multiple mounting slots (11) are spaced apart circumferentially along the rotor body (10), and multiple grooves (12) are provided. Each mounting slot (11) has a corresponding recess (112) at its end, thereby forming multiple bent magnetic bridges (120) at the ends of the multiple mounting slots (11); or The multi-layered mounting grooves (11) are arranged radially spaced along the rotor body (10), and there are multiple grooves (12). Each mounting groove (11) has a corresponding recess (112) at its end, so as to form multiple bent magnetic bridges (120) at the ends of the multi-layered mounting grooves (11); or The multiple mounting grooves (11) are arranged radially spaced along the rotor body (10) to form a set of mounting groove groups (110). Multiple sets of mounting groove groups (110) are arranged circumferentially spaced along the rotor body (10). There are multiple grooves (12), and each mounting groove (11) has a corresponding recess (112) at its end, so that multiple bent magnetic bridges (120) are formed at the ends of the multiple sets of mounting groove groups (110); or The multi-layered mounting grooves (11) are arranged radially at intervals along the rotor body (10) to form a set of mounting groove groups (110). Multiple sets of mounting groove groups (110) are arranged circumferentially at intervals along the rotor body (10). The multi-layered mounting grooves (11) within a set of mounting groove groups (110) are symmetrically arranged along the magnetic pole center line. Adjacent sets of mounting groove groups (110) are symmetrically arranged along the magnetic pole boundary line. There are multiple grooves (12). The recesses (112) at the ends of the two mounting grooves (11) in the inner layer of two adjacent sets of mounting groove groups (110) correspond to one groove (12). The recesses (112) at the ends of the two mounting grooves (11) in the outer layer of two adjacent sets of mounting groove groups (110) correspond to one groove (12), so as to form multiple bent magnetic isolation bridges (120) at the ends of the multi-layered mounting grooves (11) in multiple sets of mounting groove groups (110); or Multiple mounting slots (11) are spaced circumferentially along the rotor body (10). Each mounting slot (11) is symmetrically arranged along the magnetic pole center line. Adjacent mounting slots (11) are symmetrically arranged along the magnetic pole boundary line. The two recesses (112) at the ends of two adjacent mounting slots (11) correspond to one groove (12), so as to form multiple bent magnetic isolation bridges (120) at the ends of the multiple mounting slots (11); or The mounting groove (11) has a convex-concave structure including a protrusion (111) and a recess (112), and the magnetic bridge (120) is arranged in a Z-shape; or The mounting groove (11) has a concave-convex structure including a protrusion (111) and two concave parts (112). The protrusion (111) is located in the middle of the two concave parts (112). There are multiple grooves (12), and the two concave parts (112) correspond to one groove (12) respectively.

6. The motor rotor according to claim 1, characterized in that, The multiple mounting slots (11) are arranged radially spaced along the rotor body (10) to form a set of mounting slot groups (110). Two adjacent mounting slots (11) in a set of mounting slot groups (110) include an inner mounting slot (100) near the center of the rotor body (10) and an outer mounting slot (200) near the outer periphery of the rotor body (10). There are multiple grooves (12), and the multiple grooves (12) are arranged at intervals along the circumference of the rotor body (10). The multiple grooves (12) include a first groove (121) corresponding to the inner layer mounting groove (100) and a second groove (122) corresponding to the outer layer mounting groove (200). Wherein, the width of the first groove (121) is greater than the width of the second groove (122); or the width of the first groove (121) along the circumferential direction of the rotor body (10) is K, and the width of the second groove (122) along the circumferential direction of the rotor body (10) is L, wherein 1.2≤K / L≤2.

5.

7. The motor rotor according to claim 1, characterized in that, The multiple mounting slots (11) are arranged radially spaced along the rotor body (10) to form a set of mounting slot groups (110); two adjacent mounting slots (11) in a set of mounting slot groups (110) include an inner mounting slot (100) near the center of the rotor body (10) and an outer mounting slot (200) near the outer periphery of the rotor body (10). There are multiple grooves (12), and the multiple grooves (12) are arranged at intervals along the circumference of the rotor body (10). The multiple grooves (12) include a first groove (121) corresponding to the inner layer mounting groove (100) and a second groove (122) corresponding to the outer layer mounting groove (200). A bent first magnetic isolation bridge (4) is formed between the first groove (121) and the inner layer mounting groove (100), and a bent second magnetic isolation bridge (5) is formed between the second groove (122) and the outer layer mounting groove (200). Wherein, the bending directions of the bending points between the first magnetic isolation bridge (4) and the second magnetic isolation bridge (5) are opposite; or the bending point of the first magnetic isolation bridge (4) is an acute angle and the bending point of the second magnetic isolation bridge (5) is an obtuse angle; or the included angle of the bending point of the first magnetic isolation bridge (4) is M and the included angle of the bending point of the second magnetic isolation bridge (5) is J, wherein 0°<M<90°, 90°<J<180°, and 0.3≤M / J≤0.

9.

8. A permanent magnet assisted synchronous reluctance motor, characterized in that, The permanent magnet assisted synchronous reluctance motor includes the motor rotor as described in any one of claims 1-7.

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