Permanent magnet synchronous motor rotor structure

Abstract

The invention relates to a permanent magnet synchronous motor rotor structure which comprises a rotating shaft hole, a plurality of spoke magnetic steel groove assemblies and a plurality of radial magnetic steel groove assemblies. Each spoke magnetic steel groove assembly comprises a spoke magnetic steel sub-groove, an end boss and spoke magnetic steel, the cross section of each spoke magnetic steel is in axial symmetry, the projection length of the cross section of each spoke magnetic steel on the symmetry axis of the spoke magnetic steel exceeds the projection length of the cross section of each spoke magnetic steel in the second direction, and a rectangular air magnetic barrier is arranged between every two adjacent spoke magnetic steel groove assemblies. Gaps are formed between the rectangular air magnetic barriers and the end bosses in the two spoke magnetic steel groove assemblies adjacent to the rectangular air magnetic barriers so as to form first magnetic isolation bridges, and notches are formed in the edge of the rotor so as to disconnect the magnetic bridges; a radial magnetic steel groove assembly is arranged between any two adjacent spoke magnetic steel groove assemblies, and the included angles between the symmetry axis of the radial magnetic steel groove assembly and the symmetry axis of the two adjacent spoke magnetic steel are equal. Compared with the prior art, the invention has the advantages of low cost, lasting high rotating speed, improved electric energy utilization rate and the like.

Description

Technical Field

[0001] The present invention relates to the field of electric drive, and in particular to a permanent magnet synchronous motor rotor structure. Background Art

[0002] Permanent magnet synchronous motors use permanent magnets to provide excitation, making the motor structure simpler, which has certain advantages.

[0003] The rotors of existing permanent magnet synchronous motors all use some high-performance rare earth permanent magnet NdFeB magnets to improve performance. In order to save costs and improve the effectiveness of high-performance rare earth permanent magnet NdFeB magnets, most existing technologies use a solution of mixing high-performance rare earth permanent magnet NdFeB magnets and ordinary magnets. For example, some radially distributed 3-layer magnet structures only place high-performance rare earth permanent magnet NdFeB magnets in the outermost radial magnet slots and low-cost magnetic ceramics in the remaining layers. However, in this way, the placement space of rare earth permanent magnet NdFeB magnets is limited and the motor performance is not improved.

[0004] In addition, permanent magnet synchronous motors are at risk of disconnection when running at high speeds. To solve this problem, the stress tolerance capacity needs to be improved. To this end, the existing technology usually adopts a method of strengthening the structural strength, but this method will increase the mass of the rotor, thereby increasing the mass and volume of the entire motor, which is not conducive to improving or maintaining the utilization rate of electric energy. Summary of the invention

[0005] The purpose of the present invention is to provide a permanent magnet synchronous motor rotor structure, which is achieved by designing spoke magnetic steel slot assemblies and radial magnetic steel slot assemblies that are arranged at intervals, and arranging rare earth permanent magnet neodymium iron boron materials in the radial magnetic steel slot assemblies at the outer edge, and arranging magnetic ceramic materials in the spoke magnetic steel slot assemblies, and rectangular air magnetic barriers are arranged between the spoke magnetic steel slot assemblies. The interior of the rectangular air magnetic barriers can be used to add rectangular magnetic ceramics. On the one hand, the rotor leakage can be reduced while reducing costs, the utilization rate of the magnetic steel can be improved, and the output torque of the motor can be ensured. On the other hand, a magnetic isolation bridge is formed between the rectangular air magnetic barrier and the spoke magnetic steel slot to bear the mechanical stress of the rotor, thereby ensuring the reliability of the motor during high-speed operation.

[0006] The purpose of the present invention can be achieved by the following technical solutions:

[0007] A permanent magnet synchronous motor rotor structure comprises a rotating shaft hole, a plurality of spoke magnetic steel slot assemblies and a plurality of radial magnetic steel slot assemblies;

[0008] The spoke magnetic steel slot assembly includes a spoke magnetic steel sub-slot, an end boss for supporting the spoke magnetic steel sub-slot, and a spoke magnetic steel filled in the spoke magnetic steel sub-slot, wherein the cross section of the spoke magnetic steel is axisymmetric, and the projection length of the cross section of the spoke magnetic steel on its axis of symmetry exceeds the projection length in a second direction, wherein the second direction is a direction perpendicular to its axis of symmetry, and the cross section is perpendicular to the axis of the shaft hole,

[0009] All the spoke magnetic steel slot components are arranged around the shaft hole, and a rectangular air magnetic barrier is provided between adjacent spoke magnetic steel slot components, the rectangular air magnetic barrier is located at one end of the spoke magnetic steel slot component close to the shaft hole, and a gap is provided between the rectangular air magnetic barrier and the end bosses in the two adjacent spoke magnetic steel slot components to form a first magnetic isolation bridge, and a notch is provided at the rotor edge at one end of the spoke magnetic steel slot component away from the shaft hole to disconnect the magnetic bridge;

[0010] A radial magnetic steel slot assembly is provided between any two adjacent spoke magnetic steel slot assemblies, a second magnetic isolation bridge is provided between the radial magnetic steel slot assembly and the outer edge of the rotor, and the radial magnetic steel slot assembly includes at least one layer of magnetic steel slots. The radial magnetic steel slot assembly is axially symmetrical, and the angle between the symmetry axis of the radial magnetic steel slot assembly and the symmetry axis of its two adjacent spoke magnets is equal.

[0011] The radial magnetic steel slot assembly is provided with rare earth permanent magnet neodymium iron boron magnetic steel.

[0012] The width of the cross section of the spoke magnetic steel along its symmetry axis from one end near the rotating shaft hole to one end far from the rotating shaft hole first increases and then decreases, and the distance between the maximum width and one end near the rotating shaft hole is smaller than the distance between the maximum width and one end far from the rotating shaft hole.

[0013] The cross section of the spoke magnetic steel is rectangular.

[0014] The radial magnetic steel slot assembly includes a first radial magnetic steel slot, the first radial magnetic steel slot includes one or more first radial magnetic steel sub-slots, the first radial magnetic steel sub-slot is a rectangular slot, and multiple first radial magnetic steel sub-slots are arranged in sequence, and a first magnetic isolation bridge is provided between the end of the outermost first radial magnetic steel sub-slot close to the outer edge of the rotor and the outer edge of the rotor, and the rare earth permanent magnet neodymium iron boron magnet is arranged in the first radial magnetic steel sub-slot.

[0015] A third magnetic isolation bridge or a first connecting channel is provided between adjacent first radial magnetic steel slots.

[0016] The radial magnetic steel slot assembly also includes a second radial magnetic steel slot, which is arranged on the inner side of the first radial magnetic steel slot, and the second radial magnetic steel slot wraps the first radial magnetic steel slot on three sides, wherein the inner side of the first radial magnetic steel slot is the side close to the rotating shaft hole.

[0017] The second radial magnetic steel slot includes at least two second radial magnetic steel sub-slots, the second radial magnetic steel sub-slots are in the shape of an arc slot or a rectangular slot, and multiple second radial magnetic steel sub-slots are arranged in sequence, and a fourth magnetic isolation bridge is provided between the end of the outermost second radial magnetic steel sub-slot close to the outer edge of the rotor and the outer edge of the rotor.

[0018] The number of the second radial magnetic steel sub-slots is three, wherein the lengths of the second radial magnetic steel sub-slots on both sides are smaller than the second radial magnetic steel sub-slots in the middle, the second radial magnetic steel sub-slots on both sides are rectangular slots, the second radial magnetic steel sub-slots in the middle are arc-shaped slots or rectangular slots, and a fourth magnetic isolation bridge is provided between one end of the second radial magnetic steel sub-slots on both sides close to the outer edge of the rotor and the outer edge of the rotor.

[0019] A fifth magnetic isolation bridge or a second connecting channel is provided between adjacent second radial magnetic steel sub-slots.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. By designing the spoke magnetic steel slot components and radial magnetic steel slot components that are arranged at intervals, and arranging the rare earth permanent magnet neodymium iron boron material in the radial magnetic steel slot components at the outer edge, and providing rectangular air magnetic barriers between the spoke magnetic steel slot components, on the one hand, the output torque of the motor can be guaranteed while reducing the cost, and on the other hand, during the high-speed operation of the motor, the rectangular air magnetic barriers opened between the spoke magnetic steel slots close to the shaft hole side, and rectangular magnetic ceramics added inside the rectangular air magnetic barriers, can reduce rotor leakage, improve the utilization rate of the magnetic steel, and improve the output torque of the motor.

[0022] 2. The spoke magnet adopts a spindle-shaped design, and the magnetic bridge at the outer end of each spoke magnet slot assembly is disconnected to reduce rotor leakage and improve magnet utilization and output torque.

[0023] 3. At least a first radial magnetic steel sub-slot is provided for placing rare earth permanent magnet NdFeB magnetic steel, which can ensure the motor performance.

[0024] 4. An additional second radial magnetic steel slot is provided to meet diverse needs while ensuring performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the rotor structure of Example 1 of the present invention;

[0026] Figure 2 This is a partial structural diagram of the rotor of Example 1 of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the spoke magnetic steel of Example 1 of the present invention;

[0028] Figure 4This is a partial structural diagram of the rotor of Example 2 of the present invention;

[0029] Figure 5 This is a partial structural diagram of the rotor of Example 3 of the present invention;

[0030] Figure 6 This is a partial structural diagram of the rotor of Example 4 of the present invention;

[0031] Figure 7 This is a partial structural diagram of the rotor of Example 5 of the present invention;

[0032] Figure 8 This is a partial structural diagram of the rotor of Example 6 of the present invention;

[0033] Fig. 9 This is a partial structural diagram of the rotor of Example 7 of the present invention;

[0034] Fig.10 Partial structural diagram of the rotor of Example 8 of the present invention

[0035] Fig.11 This is a partial structural diagram of the rotor of Example 9 of the present invention.

[0036] Among them: 10, shaft hole, 11, spoke magnetic steel slot assembly, 12, first radial magnetic steel slot, 13, second radial magnetic steel slot, 111, spoke magnetic steel sub-slot, 112, rectangular air magnetic barrier, 113, spoke magnetic steel, 114, first magnetic isolation bridge, 115, end boss, 116, rectangular magnetic steel, 121, first radial magnetic steel sub-slot, 122, first radial magnetic steel, 123, second magnetic isolation bridge, 124, third magnetic isolation bridge, 125, first connecting channel, 131, second radial magnetic steel sub-slot, 132, second radial magnetic steel, 133, fourth magnetic isolation bridge, 134, fifth magnetic isolation bridge, 135, second connecting channel, 135, second connecting channel. DETAILED DESCRIPTION

[0037] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0038] A permanent magnet synchronous motor rotor structure, such as Figures 1 to 11 As shown, it includes a shaft hole 10, a plurality of spoke magnetic steel slot assemblies 11 and a plurality of radial magnetic steel slot assemblies;

[0039] The spoke magnetic steel slot assembly 11 includes a spoke magnetic steel sub-slot 111, an end boss 115 for supporting the spoke magnetic steel sub-slot 111, and a spoke magnetic steel 113 filled in the spoke magnetic steel sub-slot 111, wherein the cross section of the spoke magnetic steel 113 is axially symmetrical, and the projection length of the cross section of the spoke magnetic steel 113 on its symmetry axis exceeds the projection length in the second direction, wherein the second direction is a direction perpendicular to its symmetry axis, and the cross section is perpendicular to the axis of the shaft hole 10,

[0040] All the spoke magnetic steel slot components 11 are arranged around the shaft hole 10, and a rectangular air magnetic barrier 112 is provided between adjacent spoke magnetic steel slot components 11. The rectangular air magnetic barrier 112 is located at one end of the spoke magnetic steel slot component 11 close to the shaft hole 10, and a gap is provided between the rectangular air magnetic barrier 112 and the end bosses 115 in the two adjacent spoke magnetic steel slot components 11 to form a first magnetic isolation bridge 114. A notch is provided at the rotor edge at one end of the spoke magnetic steel slot component 11 away from the shaft hole 10 to disconnect the magnetic bridge.

[0041] A radial magnetic steel slot assembly is provided between any two adjacent spoke magnetic steel slot assemblies 11, a second magnetic isolation bridge 123 is provided between the radial magnetic steel slot assembly and the outer edge of the rotor, and the radial magnetic steel slot assembly includes at least one layer of magnetic steel slots. The radial magnetic steel slot assembly is axially symmetrical, and the angle between the symmetry axis of the radial magnetic steel slot assembly and the symmetry axis of its two adjacent spoke magnetic steels 113 is equal.

[0042] By designing the spoke magnetic steel slot assemblies 11 and radial magnetic steel slot assemblies that are arranged at intervals, and arranging the rare earth permanent magnet neodymium iron boron material in the radial magnetic steel slot assemblies at the outer edge, and arranging rectangular air magnetic barriers 112 between the spoke magnetic steel slot assemblies, on the one hand, the output torque of the motor can be guaranteed while reducing costs, and on the other hand, during the high-speed operation of the motor, the rectangular air magnetic barriers 112 opened between the spoke magnetic steel slots 11 near the rotating shaft hole 10 have rectangular magnetic ceramics added inside the rectangular air magnetic barriers 112, which can reduce rotor leakage, improve the utilization rate of the magnetic steel, and improve the output torque of the motor.

[0043] The present application provides a spoke-radial hybrid magnetic pole permanent magnet synchronous motor rotor structure, in which low-cost magnetic ceramics are placed in the spoke magnetic steel slots. The magnetic ceramics placed in the spoke magnetic steel slots are irregular spindle-shaped structures that are wide in the middle and narrow at both ends along the radial direction, and rare earth permanent magnet neodymium iron boron magnets are placed in the radial magnetic steel slots.

[0044] The radial and spoke types are combined, wherein the spoke type is a single-layer structure, and in some embodiments, includes a radial multi-layer structure.

[0045] Among them, Figures 1 to 3As shown, in Example 1, all the spoke magnetic steel slot components 11 are rotationally symmetrical with respect to the axis of the shaft hole 10, and the spoke magnetic steel 113 is made of magnetic ceramic, which can effectively reduce the cost. In this embodiment, the spoke magnetic steel 113 is an irregular spindle-shaped structure with a wide middle portion and narrow ends along the radial direction, such as Figure 3 As shown, the width of the cross section of the wheel spoke magnetic steel 113 along its symmetry axis from the end near the rotating shaft hole 10 to the end far from the rotating shaft hole 10 increases first and then decreases, and the distance between the maximum width and the end near the rotating shaft hole 10 is smaller than the distance between the maximum width and the end far from the rotating shaft hole 10. This design is conducive to obtaining a regular q-axis magnetic circuit to increase the motor reluctance torque and thus increase the output torque of the motor. Specifically, the relationship between the outer diameter end width b1, the middle width b2, and the inner diameter end width b3 of the wheel magnetic steel 113 is b2≥b1, b2≥b3, wherein the value range of b1 can be set to 6mm≥b1≥3mm, and the value range of b3 can be set to 6mm≥b3≥3mm. In addition, since the magnetic bridges at the outer ends of each wheel spoke magnetic steel slot assembly 11 are disconnected, the rotor leakage is reduced, the utilization rate of the magnetic steel and the output torque are improved, and the length range of the cut-off length c1 can be set to 0.7b1≥c1≥0.35b1. The end boss 115 can be provided to support the spoke magnetic steel 113, and in some feasible embodiments, it can be replaced by other means. The rectangular air magnetic barrier 112 is located between the spoke magnetic steel sub-slots 111 and close to the rotating shaft hole 10. The thickness L1 of the magnetic isolation bridge 114 can be set to a value range of 1.25mm≥L1≥0.55mm. A rectangular magnetic steel 116 can be added to the rectangular air magnetic barrier 112 to reduce the magnetic leakage of the motor, improve the utilization rate of the magnetic steel and the output torque, and the rectangular magnetic steel 116 can be made of magnetic ceramics.

[0046] In this embodiment, the radial magnetic steel slot assembly includes a first radial magnetic steel slot 12, the first radial magnetic steel slot 12 includes one or more first radial magnetic steel sub-slots 121, the first radial magnetic steel sub-slots 121 are rectangular parallelepiped slots, and the plurality of first radial magnetic steel sub-slots 121 are arranged in sequence, and a first magnetic isolation bridge 123 is provided between the end of the outermost first radial magnetic steel sub-slot 121 close to the outer edge of the rotor and the outer edge of the rotor, and the rare earth permanent magnet neodymium iron boron magnet is arranged in the first radial magnetic steel sub-slot 121. Specifically, in this embodiment, The design of two first radial magnetic steel sub-slots 121 is used. In this embodiment, the two first radial magnetic steel sub-slots 121 are arranged axially symmetrically. The first radial magnetic steel 122 is arranged in the first radial magnetic steel sub-slot 121. The first radial magnetic steel 122 adopts rare earth permanent magnet neodymium iron boron magnet. A third magnetic isolation bridge 124 is arranged between the two first radial magnetic steels 122, and the two radial magnetic steel sub-slots 121 form a V-shaped structure with an opening facing the outer edge of the rotor. This structure can effectively utilize the rotor body material and optimize the magnetic circuit structure. The inner walls at both ends of the third magnetic isolation bridge 124 are convexly provided with magnetic steel shoulders to play a limiting role. The value range of the thickness L2 of the first magnetic isolation bridge 124 can be set to 1.25mm≥L2≥0.55mm. The second magnetic isolation bridge 123 set between the first radial magnetic steel slot assembly 12 and the outer surface of the rotor is used to ensure that the mechanical strength of the motor rotor meets the speed requirements. The value range of the thickness L3 of the second magnetic isolation bridge 123 can be set to 1.25mm≥L3≥0. The first radial magnetic steel 122 is a rare earth permanent magnet NdFeB magnetic steel, and its shape is a regular rectangle, which is convenient for cutting and forming. The ratio of the angle a2 between the left and right end points of the first radial magnetic steel slot 12 and the center angle a1 of a rotor pole can be set to 0.71≥a2 / a1≥0.52.

[0047] The specific value of the thickness of all magnetic isolation bridges can be set according to the peak speed requirement of the hybrid pole synchronous reluctance motor, that is, the thickness of the magnetic isolation bridge can be increased as the outer diameter of the rotor of the hybrid pole synchronous reluctance motor increases and the peak speed increases, and vice versa. Such a setting can reduce the rotor leakage while ensuring that the mechanical strength of the motor rotor meets the speed requirement, thereby ensuring the utilization rate of the magnetic steel, thereby reducing the cost of the hybrid pole synchronous reluctance motor.

[0048] Example 2: Reference Figure 4 On the basis of Example 1, the cross section of the spoke magnetic steel 113 is rectangular, that is, b1=b2=b3=b0 is set, that is, the spoke magnetic steel 113 is a regular rectangular structure with a width of b0.

[0049] Example 3: Reference Figure 5On the basis of Example 1, the first radial magnetic steel sub-slot 121 is set as a separate horizontal straight-line structure, and the ratio of the angle a2 between the left and right end points of the first magnetic steel sub-slot 121 and the center of the circle to the central angle a1 of one pole of the rotor can be set to 0.71≥a2 / a1≥0.52. A second magnetic isolation bridge 123 is provided between the first magnetic steel sub-slot 121 and the outer surface of the rotor, and the thickness L1 of the second magnetic isolation bridge 123 can be set to a value range of 1.25mm≥L1≥0.55mm.

[0050] Example 4: Reference Figure 6On the basis of Example 3, a double-layer magnetic steel slot structure is adopted, that is, the radial magnetic steel slot assembly also includes a second radial magnetic steel slot 13, the second radial magnetic steel slot 13 is arranged on the inner side of the first radial magnetic steel slot 12, and the second radial magnetic steel slot 12 wraps the first radial magnetic steel slot 13 on three sides, wherein the inner side of the first radial magnetic steel slot 12 is a side where the shaft hole 10 is arranged. A magnetic conductive channel is formed between the second radial magnetic steel slots 13 and the first radial magnetic steel slots 12. This multi-layer topological structure can further increase the proportion of magnetic resistance torque and improve the output torque of the motor. In this example, the first radial magnetic steel slots 12 are all I-shaped magnetic structures, and the second radial magnetic steel slots 13 include three second radial magnetic steel sub-slots 131, which are arranged in sequence, wherein the length of the second radial magnetic steel sub-slots 131 on both sides is shorter than the second radial magnetic steel sub-slot 131 in the middle, the second radial magnetic steel sub-slots 131 on both sides are rectangular slots, and the second radial magnetic steel sub-slots 131 in the middle are also rectangular slots, and a fourth magnetic isolation bridge 133 is provided between the second radial magnetic steel sub-slots 131 on both sides close to the outer edge of the rotor and the outer edge of the rotor. Overall, the three second radial magnetic steel sub-slots 131 surround a U-shaped structure similar to an opening facing outward, and the second radial magnetic steel sub-slots 131 are provided with second radial magnetic steel 132. Generally, the second radial magnetic steel 132 can be selected from magnetic ceramics, and each second radial magnetic steel sub-slot 131 is connected by a second connecting channel 135. The length of the second connecting channel 135 is less than the thickness of the built-in second radial magnetic steel 132 to form a stopper. The second connecting channel 135 is non-magnetic, which can reduce the magnetic leakage of the rotor, optimize the direction of the magnetic lines of force, and improve the output torque of the motor. In this embodiment, the second radial magnetic steel 132 in the second radial magnetic steel sub-slot 131 is set as a regular rectangular magnetic ceramic, and the second radial magnetic steel 132 in the second radial magnetic steel sub-slots 131 on both sides is set as a regular rectangular rare earth permanent magnet neodymium iron boron magnet to ensure the anti-demagnetization ability of the hybrid magnetic pole synchronous reluctance motor. Of course, in some other embodiments, the second radial magnetic steel 132 can also be designed to use magnetic ceramics or rare earth permanent magnet neodymium iron boron magnets. The ratio range of the angle a2 between the left and right end points of the inner second radial magnetic steel slot 13 and the center angle a1 of one pole of the rotor can be set to 0.71≥a2 / a1≥0.52, and the value range of the thickness L2 of the fourth magnetic isolation bridge 133 provided between the second radial magnetic steel slot 13 and the outer surface of the rotor can be set to 1.25mm≥L2≥0.55mm. In this embodiment, the outer magnetic steel slot includes: the structure of the outer first radial magnetic steel slot 12 can adopt a form similar to that of embodiment 3, except that the length of the first radial magnetic steel sub-slot 121 is slightly shorter. The ratio range of the angle a3 between the left and right end points of the first radial magnetic steel slot 12 and the center angle a1 of one pole of the rotor can be set to 0.41≥a3 / a1≥0.22. In this embodiment, the value range of the thickness L1 of the second magnetic isolation bridge 123 can be set to 1.25mm≥L1≥0.55mm.

[0051] Example 5: Reference Figure 7 On the basis of Example 4, the middle section of the second radial magnetic steel slot 131 of the inner layer is arranged in an arc shape, and the arc opening faces the outer edge of the rotor. The second radial magnetic steel 132 arranged in the second radial magnetic steel slot 131 can be a magnetic ceramic or other magnet with an arc structure. Such an arrangement can optimize the direction of the magnetic lines of force and reduce torque fluctuations. The specific implementation method can be set by referring to Example 4 and actual needs, and will not be described in detail here.

[0052] Example 6: Reference Figure 8 On the basis of Example 5, the inner layer of the second radial magnetic steel slots 13 can be configured to adopt four second radial magnetic steel sub-slots 131, and the two located at the outermost edges can be similar to the second radial magnetic steel sub-slots 131 on both sides in Example 5, but the two middle second radial magnetic steel sub-slots 131 adopt an arc-shaped design, and a fifth magnetic isolation bridge 134 is provided between the two arc-shaped second radial magnetic steel sub-slots 131. In addition, in this embodiment, the second radial magnetic steel sub-slots 131 are arc-shaped with unequal thickness, that is, the thickness close to the center line is greater than the thickness close to the outer edge of the rotor. The value range of the thickness L2 of the fourth magnetic isolation bridge 133 can be set to 1.25mm≥L2≥0.55mm, and the thickness of the fifth magnetic isolation bridge 134 is between 1.25mm and 0.55mm.

[0053] Example 7: Reference Fig. 9 On the basis of Example 5, the first radial magnetic steel slot 12 of the outer layer is configured to include two first radial magnetic steel sub-slots 121 symmetrically on the left and right sides of the center line, and the first connecting channel 125 is used to connect the two first radial magnetic steel sub-slots 121. The inner walls at both ends of the first connecting channel 125 are both protruding from the magnetic steel shoulders symmetrically on the center line to play a limiting role. The first radial magnetic steel 122 in the first radial magnetic steel sub-slot 121 is preferably a rare earth permanent magnet neodymium iron boron magnetic steel, which is arranged in a regular rectangular shape for cutting and forming. The two first radial magnetic steels 122 are gradually expanded from the rotation axis hole side to the outer edge side of the rotor to form a V-shaped structure with an opening facing the outer edge side of the rotor 100. This arrangement is conducive to enhancing the magnetic concentration effect of the magnetic steel. The value range of the thickness L1 of the second magnetic isolation bridge 123 between the first radial magnetic steel sub-slot 121 and the outer surface of the rotor can be set to 1.25mm≥L1≥0.55mm. The ratio of the left and right end angles a3 of the first radial magnetic steel slot 12 to the central angle a1 of a rotor pole can be set to 0.41≥a3 / a1≥0.22. The specific implementation method can be set by referring to Example 5 and actual needs, and will not be described here.

[0054] Example 8: Reference Fig.10On the basis of Example 6 and Example 7, the design of the second radial magnetic steel slot 13 of Example 6 is adopted, and the design of the first radial magnetic steel slot 12 of Example 7 is adopted.

[0055] Example 9: Reference Fig.11 On the basis of Example 1 and Example 7, the design of the first radial magnetic steel slot 12 in Example 7 is adopted, and the second radial magnetic steel slot 13 in this embodiment adopts the design of the first radial magnetic steel slot 12 in Example 1.

Claims

1. A permanent magnet synchronous motor rotor structure, characterized in that: It comprises a rotating shaft hole (10), a plurality of spoke magnetic steel slot assemblies (11) and a plurality of radial magnetic steel slot assemblies; The spoke magnetic steel slot assembly (11) comprises a spoke magnetic steel sub-slot (111), an end boss (115) for supporting the spoke magnetic steel sub-slot (111), and a spoke magnetic steel (113) filled in the spoke magnetic steel sub-slot (111), wherein the cross section of the spoke magnetic steel (113) is axially symmetrical, and the projection length of the cross section of the spoke magnetic steel (113) on its symmetry axis exceeds the projection length in a second direction, wherein the second direction is a direction perpendicular to its symmetry axis, and the cross section is perpendicular to the axis of the shaft hole (10); All the spoke magnetic steel slot assemblies (11) are arranged around the shaft hole (10), and a rectangular air magnetic barrier (112) is provided between adjacent spoke magnetic steel slot assemblies (11), the rectangular air magnetic barrier (112) is located at one end of the spoke magnetic steel slot assemblies (11) close to the shaft hole (10), and a gap is provided between the rectangular air magnetic barrier (112) and the end bosses (115) in the two adjacent spoke magnetic steel slot assemblies (11) to form a first magnetic isolation bridge (114), and a notch is provided at the rotor edge at one end of the spoke magnetic steel slot assemblies (11) away from the shaft hole (10) to disconnect the magnetic bridge; A radial magnetic steel slot assembly is provided between any two adjacent spoke magnetic steel slot assemblies (11), a second magnetic isolation bridge (123) is provided between the radial magnetic steel slot assembly and the outer edge of the rotor, and the radial magnetic steel slot assembly includes at least one layer of magnetic steel slots. The radial magnetic steel slot assembly is axially symmetrical, and the angle between the symmetry axis of the radial magnetic steel slot assembly and the symmetry axis of its two adjacent spoke magnetic steels (113) is equal.

2. A permanent magnet synchronous motor rotor structure according to claim 1, characterized in that: The radial magnetic steel slot assembly is provided with rare earth permanent magnet neodymium iron boron magnetic steel.

3. A permanent magnet synchronous motor rotor structure according to claim 1, characterized in that: The width of the cross section of the spoke magnetic steel (113) along its symmetry axis from one end near the rotating shaft hole (10) to one end far from the rotating shaft hole (10) first increases and then decreases, and the distance between the maximum width and one end near the rotating shaft hole (10) is smaller than the distance between the maximum width and one end far from the rotating shaft hole (10).

4. A permanent magnet synchronous motor rotor structure according to claim 1, characterized in that: The cross section of the wheel spoke magnetic steel (113) is rectangular.

5. A permanent magnet synchronous motor rotor structure according to claim 2, characterized in that: The radial magnetic steel slot assembly comprises a first radial magnetic steel slot (12), the first radial magnetic steel slot (12) comprising one or more first radial magnetic steel sub-slots (121), the first radial magnetic steel sub-slots (121) being rectangular parallelepiped slots, and the plurality of first radial magnetic steel sub-slots (121) being arranged in sequence, a first magnetic isolation bridge (123) being arranged between an end of the outermost first radial magnetic steel sub-slot (121) close to the outer edge of the rotor and the outer edge of the rotor, and the rare earth permanent magnet neodymium iron boron magnet being arranged in the first radial magnetic steel sub-slot (121).

6. A permanent magnet synchronous motor rotor structure according to claim 5, characterized in that: A third magnetic isolation bridge (124) or a first connecting channel (125) is provided between adjacent first radial magnetic steel slots (12).

7. A permanent magnet synchronous motor rotor structure according to claim 5, characterized in that: The radial magnetic steel slot assembly further comprises a second radial magnetic steel slot (13), wherein the second radial magnetic steel slot (13) is arranged on the inner side of the first radial magnetic steel slot (12), and the second radial magnetic steel slot (12) wraps around the first radial magnetic steel slot (13) on three sides, wherein the inner side of the first radial magnetic steel slot (12) is a side where the shaft hole (10) is arranged.

8. A permanent magnet synchronous motor rotor structure according to claim 7, characterized in that: The second radial magnetic steel slot (13) comprises at least two second radial magnetic steel sub-slots (131), each of the second radial magnetic steel sub-slots (131) being in the shape of an arc slot or a rectangular slot, and the plurality of second radial magnetic steel sub-slots (131) are arranged in sequence, and a fourth magnetic isolation bridge (133) is provided between an end of the outermost second radial magnetic steel sub-slot (131) close to the outer edge of the rotor and the outer edge of the rotor.

9. A permanent magnet synchronous motor rotor structure according to claim 8, characterized in that: The number of the second radial magnetic steel sub-slots (131) is three, wherein the length of the second radial magnetic steel sub-slots (131) located on both sides is shorter than the second radial magnetic steel sub-slot (131) located in the middle, the second radial magnetic steel sub-slots (131) located on both sides are rectangular parallelepiped slots, the second radial magnetic steel sub-slots (131) located in the middle are arc-shaped slots or rectangular parallelepiped slots, and fourth magnetic isolation bridges (133) are provided between the ends of the second radial magnetic steel sub-slots (131) located on both sides close to the outer edge of the rotor and the outer edge of the rotor.

10. A permanent magnet synchronous motor rotor structure according to claim 8, characterized in that: A fifth magnetic isolation bridge (134) or a second connection channel (135) is provided between adjacent second radial magnetic steel sub-slots (131).

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