Permanent magnet rotor core assembly and motor rotor

Abstract

This invention discloses a permanent magnet rotor core assembly, comprising rotor core laminations A and B integrally stamped from thin silicon steel sheets, magnets, and potting thermosetting material; a permanent magnet motor rotor, comprising at least two sets of permanent magnet rotor core assemblies; and further comprising a rotor shaft, locking nuts, two dynamic balance end plates, and several reinforcing rods. This invention solves the problem that current permanent magnet motors cannot simultaneously achieve high rotor strength and high motor performance at high speeds, achieving high motor performance while meeting high rotor speed requirements; it significantly improves rotor strength, eliminates some magnetic bridges, and uses injection-molded materials and inserted reinforcing rods to fix the rotor laminations and magnets, thereby further reducing the stress of the magnetic bridges, balancing mechanical strength and electromagnetic performance, greatly reducing magnetic leakage, increasing torque density, and further improving the power density of the motor; the asymmetric groove design on the rotor surface suppresses torque fluctuations and reduces the NVH noise of the motor itself.

Description

Technical Field

[0001] This invention relates to the field of permanent magnet motor technology, and in particular to a permanent magnet rotor core assembly and a motor rotor. Background Technology

[0002] With the rapid development of new energy vehicle technology, the performance requirements for vehicle drive motors are becoming increasingly stringent. To achieve high performance, motor speeds are increasing, which poses greater challenges to the motor structure. Since vehicle drive motors use permanent magnet motors, the magnets are mostly internally arranged. A magnetic isolation bridge is needed on the rotor core to fix the magnets (in permanent magnet motors, to prevent excessive leakage flux and low utilization of the permanent magnets, a magnetic isolation measure is used: a silicon steel sheet is used to separate two permanent magnets; this silicon steel sheet is called a magnetic isolation bridge). When the vehicle drive motor operates at high speed, the rotor generates significant centrifugal force, posing a risk of fatigue fracture of the magnetic isolation bridge due to stress concentration. To ensure rotor strength, the structural size of the magnetic isolation bridge can be increased, but this also increases motor leakage flux, leading to a decrease in torque, power factor, and efficiency. Currently, industry designs cannot simultaneously consider both mechanical strength and electromagnetic performance at high speeds, and often sacrifice electromagnetic performance to ensure mechanical strength. Summary of the Invention

[0003] To address the aforementioned issues, this invention proposes a permanent magnet rotor core assembly. Its purpose is to resolve the current problem of balancing rotor strength and motor performance at high speeds in permanent magnet motors, achieving high motor performance while maintaining high rotor speed. The invention significantly improves rotor strength by eliminating some magnetic bridges and employing injection-molded materials and reinforcing rods to fix the rotor laminations and magnets, thereby further reducing the stress on the magnetic bridges. This balances mechanical strength and electromagnetic performance, greatly reducing magnetic leakage, increasing torque density, and further improving the motor's power density. The asymmetric groove design on the rotor surface suppresses torque fluctuations and reduces the motor's NVH noise.

[0004] The present invention provides a permanent magnet rotor core assembly, comprising rotor core lamination A and rotor core lamination B integrally stamped from thin silicon steel sheets, and further comprising magnets and potting thermosetting materials.

[0005] Both rotor core laminations A and B have V-shaped magnet receiving slots evenly distributed in the circumferential direction. The V-shaped magnet receiving slot A of rotor core lamination A is a V-shaped magnet receiving slot without an internal magnetic isolation bridge, while the V-shaped magnet receiving slot B of rotor core lamination B is a V-shaped magnet receiving slot containing an internal magnetic isolation bridge. The rotor core assembly consists of rotor core lamination A and core lamination B clamped and fixed in rotor core lamination A. Since the V-shaped magnet receiving slot of rotor core lamination A does not contain an internal magnetic isolation bridge, while the V-shaped magnet receiving slot of rotor core lamination B contains an internal magnetic isolation bridge, the structure with rotor core laminations A at both ends and rotor core lamination B clamped in the middle greatly reduces magnetic leakage, increases torque density, and further improves the power density of the motor.

[0006] The magnets are embedded in the two side walls of each V-shaped magnet receiving slot in the circumferential direction within the cylindrical space formed by the stacking of rotor core laminations A and B. Furthermore, each V-shaped magnet receiving slot extends axially throughout the cylindrical space formed by the stacking of rotor core laminations A and B. A thermosetting potting material is applied to the magnet receiving slots at both ends of each magnet within the cylindrical space formed by the stacking of rotor core laminations A and B. The purpose of the thermosetting potting material is to reduce the stress on the magnetic bridge, balancing mechanical strength and electromagnetic performance to meet the higher speed requirements of the drive motor in new energy vehicles. Shaft holes A and B are respectively opened at the center of rotor core laminations A and B, allowing the rotor shaft to pass through and be fitted into them.

[0007] The outer ring surfaces of rotor core laminations A and B are provided with axial long grooves A and B respectively, corresponding to the magnetic bridge at the upper end of each magnet pole. Asymmetrical long grooves A and B are respectively provided on one side of the center vertical line between the lower ends of the magnet poles of two adjacent magnets in the V-shaped magnet receiving groove on the outer ring surfaces of rotor core laminations A and B. The function of the grooves and asymmetrical grooves is to enable the non-uniform air gap to be formed better between the motor rotor and the motor stator, so as to better reduce the NVH noise (noise, vibration, and harshness) of the motor itself.

[0008] The permanent magnet rotor core assembly is formed by stacking 2N rotor core laminations B in the middle. The asymmetrical long grooves B of N rotor core laminations B and the asymmetrical long grooves B of another N rotor core laminations B are symmetrically distributed on both sides of the vertical line of the magnetic pole center. The staggered structure of the asymmetrical long grooves is to maintain the balance of forces so that a non-uniform air gap can be formed between the motor rotor and the motor stator, reducing NVH noise. The number N of rotor core laminations B is a positive integer.

[0009] M rotor core laminations A are stacked on both sides of 2N rotor core laminations B. The asymmetrical long grooves A of the M rotor core laminations A on each side are distributed on the same side of the magnetic pole center line as the asymmetrical long grooves B of the adjacent stacked N rotor core laminations B, so as to increase the strength of each rotor core assembly. The number M of rotor core laminations A is a positive integer, and the number M of rotor core laminations A is greater than the number N of rotor core laminations B.

[0010] The rotor core lamination A has two circumferentially and symmetrically distributed V-shaped magnet receiving slots A, one inner and one outer. Each V-shaped magnet receiving slot A is composed of an integrally molded upper left and right wall injection groove A, a left and right wall magnet insertion groove A, and a lower thermosetting potting groove A. The upper left and right wall injection grooves A are respectively connected to the upper ends of the left and right wall magnet insertion grooves A, and the two ends of the lower thermosetting potting groove A are respectively connected to the lower ends of the left and right wall magnet insertion grooves A. The lower thermosetting potting groove A is connected between the two magnets. The method involves using silicon steel sheets, eliminating the magnetic bridge and reducing its stress. The magnets are respectively matched and embedded in the magnet insertion slots A on the left and right walls. Thermosetting potting material is injected into the upper left and right wall injection grooves A and the lower thermosetting potting groove A. Each V-shaped magnet receiving groove A has a reinforcing rod receiving hole A on the rotor core lamination A above the lower thermosetting potting groove A. This allows multiple rotor core assemblies to be stacked and the reinforcing rods to be inserted to form a squirrel cage structure, increasing the strength of the motor rotor at all V-shaped magnet receiving grooves A.

[0011] The rotor core laminations B have two symmetrically distributed V-shaped magnet receiving slots B, one inner and one outer. Each V-shaped magnet receiving slot B is composed of an integrally molded upper left and right wall injection groove B, a left and right wall magnet insertion slot B, and a lower left and right wall thermosetting potting groove B. The upper left and right wall injection grooves B are respectively connected to the upper ends of the left and right wall magnet insertion slots B, and the lower left and right wall thermosetting potting grooves B are respectively connected to the lower ends of the left and right wall magnet insertion slots B. The adjacent ends of the lower left and right wall thermosetting potting grooves B are separated by silicon steel sheets to form a magnetic isolation bridge. Silicon steel sheets are placed between the steel sections, forming a magnetic isolation bridge. To prevent excessive leakage flux of the permanent magnets, the magnets are respectively matched and embedded in the magnet insertion slots B on the left and right walls. Thermosetting potting material is poured into the upper left and right wall injection molding slots B and the lower left and right wall thermosetting potting slots B, respectively. The rotor core laminations B above the magnetic isolation bridge between the lower left and right wall thermosetting potting slots B of each V-shaped magnet receiving slot B are provided with reinforcing rod receiving holes B, so that reinforcing rods can be inserted after multiple sets of rotor core assemblies are stacked to form a squirrel cage structure, increasing the strength of the motor rotor at all V-shaped magnet receiving slots B.

[0012] This application also provides an electric motor rotor, including at least two sets of permanent magnet rotor core assemblies; it also includes a rotor shaft, a locking nut, two dynamic balance end plates, and several reinforcing rods;

[0013] At least two sets of permanent magnet rotor core assemblies are stacked and sleeved on the rotor shaft. Two dynamic balancing end plates are also sleeved on the rotor shaft, and the two dynamic balancing end plates are respectively attached to the two end faces of the at least two sets of permanent magnet rotor core assemblies stacked on each other. The shoulder of one end of the rotor shaft and the locking nut screwed to the other end of the rotor shaft screw and fix the two dynamic balancing end plates and the at least two sets of permanent magnet rotor core assemblies.

[0014] Several reinforcing rods are respectively housed in the reinforcing rod receiving holes A and B of at least two sets of permanent magnet rotor core assemblies stacked axially. The two ends of each reinforcing rod penetrate and are fixed to two dynamic balance end plates. The two dynamic balance end plates and the several reinforcing rods fixed in the circumferential direction constitute a squirrel cage structure, which improves the overall strength of the rotor and further reduces the stress of the magnetic isolation bridge.

[0015] Each of the dynamic balancing end plates has a rotor shaft end plate shaft hole at its center. The rotor shaft is sleeved and fixed to the rotor shaft end plate shaft hole. Each of the dynamic balancing end plates has upper left and right wall injection molding grooves B and lower left and right wall thermosetting potting grooves B corresponding to each V-shaped magnet receiving groove B on the rotor core lamination B, as well as each reinforcing rod receiving hole B. The end plate has upper left and right potting holes, lower left and right potting holes, and end plate reinforcing rod receiving holes. Thermosetting potting material is injected into the upper left and right potting holes and lower left and right potting holes of the end plate, and each reinforcing rod is respectively housed and fixed within the end plate. The thermosetting material and reinforcing rods in each end plate reinforcing rod receiving hole enhance the overall strength of the rotor. This prevents the silicon steel sheets near the V-shaped magnet receiving slots from breaking off from the rotor core laminations A and B due to the stress of the magnetic bridge when the rotor rotates at high speed in the stator, thus preventing damage to the drive motor. The two rings of reinforcing rods passing through the upper part of the inner and outer V-shaped magnet receiving slots A and B are parallel to the axial direction, rather than penetrating through the two V-shaped magnet receiving slots. This ensures that the magnetic circuit of the reluctance torque is uninterrupted, thus improving performance.

[0016] Each lower end thermosetting potting groove A of rotor core lamination A and each pair of lower end left and right wall thermosetting potting grooves B of rotor core lamination B are all U-shaped structures with a small opening and a large belly. The reinforcing rod receiving hole A and the reinforcing rod receiving hole B are respectively set in the corresponding U-shaped structures. One purpose of the U-shaped structure is to limit the lower end of the magnet embedded in the left and right wall magnet insertion groove. The other purpose is to act as a reinforcing rib to increase the strength of the circumferential silicon steel sheet in the V-shaped magnet receiving groove and prevent the silicon steel sheet from breaking due to stress.

[0017] The reinforcing rod is made of a non-magnetic and non-conductive non-metallic material, such as PEEK (polyetheretherketone), PC (polycarbonate), acrylic, or bakelite. The reinforcing rod uses an insulating, non-magnetic material, thus avoiding the problems of severe heat generation and reduced efficiency caused by eddy current losses. The potting thermosetting material is a non-magnetic and non-conductive high-strength injection molding material, specifically EMC (Epoxy Molding Compound).

[0018] Beneficial effects

[0019] This invention solves the problem that current permanent magnet motors cannot simultaneously achieve high rotor strength and high motor performance at high speeds. It significantly improves rotor strength by eliminating some magnetic bridges and using injection-molded materials and reinforcing rods to fix the rotor laminations and magnets, thereby further reducing the stress on the magnetic bridges. It balances mechanical strength and electromagnetic performance, greatly reduces magnetic leakage, increases torque density, and further improves the power density of the motor. The asymmetric groove design on the rotor surface suppresses torque fluctuations and reduces the NVH noise of the motor itself. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the permanent magnet rotor core assembly of the present invention.

[0021] Figure 2 This is a front view structural schematic diagram of the permanent magnet rotor core assembly of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of rotor core lamination A of the present invention.

[0023] Figure 4 This is a schematic diagram of the rotor core lamination B of the present invention.

[0024] Figure 5 This is a schematic diagram of the overall structure of the motor rotor of the present invention.

[0025] Figure 6 This is a schematic diagram of the overall cross-sectional structure of the motor rotor of the present invention.

[0026] Figure 7 This is a schematic diagram of the dynamic balancing end plate structure of the present invention.

[0027] Figure 8 This is a schematic diagram of a partial structure of the motor rotor of the present invention.

[0028] In the picture:

[0029] 1. Permanent magnet rotor core assembly;

[0030] 11. Rotor core lamination A;

[0031] 111. V-shaped magnet receiving groove A;

[0032] 1111. Injection grooves A on the upper left and right walls;

[0033] 1112. Insert the magnets into slots A on the left and right walls;

[0034] 1113. Lower end thermosetting potting groove A;

[0035] 1114. Reinforcing rod receiving hole A;

[0036] 1115. Long groove A;

[0037] 1116. Asymmetrical long groove A;

[0038] 112. Shaft hole A;

[0039] 12. Rotor core laminations B;

[0040] 121. V-shaped magnet receiving groove B;

[0041] 1211. Injection grooves B on the upper left and right walls;

[0042] 1212. Insert the magnets into slots B on the left and right walls;

[0043] 1213. Lower left and right wall thermosetting potting groove B;

[0044] 1214. Reinforcing rod receiving hole B;

[0045] 1215. Long groove B;

[0046] 1216. Asymmetrical long groove B;

[0047] 122. Shaft hole B;

[0048] 13. Magnets;

[0049] 14. Potting thermosetting materials;

[0050] 2. Rotor shaft;

[0051] 21. Shoulder;

[0052] 3. Tighten the nut;

[0053] 4. Two dynamic balancing end plates;

[0054] 41. Rotor shaft end plate shaft hole;

[0055] 42. Left and right filling holes at the upper end of the end plate;

[0056] 43. Filling holes on the left and right sides at the lower end of the end plate;

[0057] 44. End plate reinforcing rod receiving hole;

[0058] 5. Reinforcing bar. Detailed Implementation

[0059] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0060] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0061] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0062] Example 1

[0063] See Figures 1-4 As shown, a permanent magnet rotor core assembly 1 includes rotor core laminations A11 and B12 integrally stamped from thin silicon steel sheets, and also includes magnets 13 and potting thermosetting material 14.

[0064] Both rotor core laminations A11 and B12 have V-shaped magnet receiving slots evenly distributed in the circumferential direction. The V-shaped magnet receiving slot A111 of rotor core lamination A11 is a V-shaped magnet receiving slot without an internal magnetic isolation bridge, while the V-shaped magnet receiving slot B121 of rotor core lamination B12 is a V-shaped magnet receiving slot containing an internal magnetic isolation bridge. Rotor core lamination A11 holds rotor core lamination B12 between them.

[0065] The magnet 13 is embedded in the two side walls of each V-shaped magnet receiving groove in the cylindrical space formed by stacking rotor core laminations A11 and B12 in the circumferential direction. The magnet 13 extends axially and fills each V-shaped magnet receiving groove in the cylindrical space formed by stacking rotor core laminations A11 and B12. Thermosetting material 14 is respectively filled into the magnet receiving grooves at both ends of each magnet 13 in the cylindrical space formed by stacking rotor core laminations A11 and B12. Shaft holes A112 and B122 are respectively opened at the center of rotor core laminations A11 and B12.

[0066] The outer ring surfaces of the rotor core laminations A11 and B12 are provided with axial long grooves A113 and B123 corresponding to the magnetic isolation bridge of the upper magnetic pole of each magnet 13. Asymmetrical long grooves A1116 and B1216 are respectively provided on one side of the center vertical line between the lower magnetic poles of two adjacent magnets 13 in the V-shaped magnet receiving groove on the outer ring surfaces of the rotor core laminations A11 and B12.

[0067] The permanent magnet rotor core assembly 1 is formed by stacking 2N rotor core laminations B12 in the middle. The asymmetrical long grooves B1216 of the N rotor core laminations B12 and the asymmetrical long grooves B1216 of the other N rotor core laminations B12 are mirror-symmetrically distributed on both sides of the vertical line of the magnetic pole center. The number N of rotor core laminations B12 is a positive integer.

[0068] M rotor core laminations A11 are stacked on both sides of the 2N rotor core laminations B12. The asymmetric long grooves A1116 of the M rotor core laminations A11 on each side are distributed on the same side of the magnetic pole center line as the asymmetric long grooves B1216 of the adjacent stacked N rotor core laminations B12. The number M of rotor core laminations A11 is a positive integer, and the number M of rotor core laminations A11 is greater than the number N of rotor core laminations B12.

[0069] The rotor core laminations A11 have two circumferentially and symmetrically distributed V-shaped magnet receiving slots A111. Each V-shaped magnet receiving slot A111 is composed of an integrally molded upper left and right wall injection groove A1111, a left and right wall magnet insertion groove A1112, and a lower thermosetting potting groove A1113. The upper left and right wall injection grooves A1111 are respectively connected to the upper ends of the left and right wall magnet insertion grooves A1112, and the lower thermosetting potting groove... The two ends of A1113 are respectively connected to the lower ends of the left and right wall magnet insertion slots A1112. The magnets 13 are respectively matched and embedded in the left and right wall magnet insertion slots A1112. The potting thermosetting material 14 is respectively poured into the upper left and right wall injection molding grooves A1111 and the lower thermosetting potting groove A1113. The rotor core lamination A11 above the lower thermosetting potting groove A1113 of each V-shaped magnet receiving groove A111 is provided with a reinforcing rod receiving hole A1114.

[0070] The rotor core lamination B12 has two layers of V-shaped magnet receiving slots B121 evenly and symmetrically distributed in the circumferential direction. Each V-shaped magnet receiving slot B121 is composed of an integrally molded upper left and right wall injection groove B1211, a left and right wall magnet insertion groove B1212, and a lower left and right wall thermosetting potting groove B1213. The upper left and right wall injection grooves B1211 are respectively connected to the upper ends of the left and right wall magnet insertion grooves B1212, and the lower left and right wall thermosetting potting grooves B1213 are respectively connected to the left and right wall magnet insertion grooves. At the lower end of the groove B1212, the adjacent ends of the thermosetting potting grooves B1213 on the left and right walls of the lower end are separated by silicon steel sheets to form a magnetic isolation bridge. The magnets 13 are respectively matched and embedded in the magnet insertion grooves B1212 on the left and right walls. The potting thermosetting material 14 is respectively poured into the injection molding grooves B1211 on the upper left and right walls and the thermosetting potting grooves B1213 on the lower left and right walls. The rotor core lamination B12 above the magnetic isolation bridge between the thermosetting potting grooves B1213 on the lower left and right walls of each V-shaped magnet receiving groove B121 is provided with a reinforcing rod receiving hole B1214.

[0071] Example 2

[0072] See Figures 1-8 As shown, a permanent magnet motor rotor differs from Embodiment 1 in that...

[0073] It includes four sets of permanent magnet rotor core assemblies 1; it also includes rotor shaft 2, locking nut 3, two dynamic balance end plates 4 and several reinforcing rods 5;

[0074] Four sets of permanent magnet rotor core assemblies 1 are stacked and sleeved on rotor shaft 2. Two dynamic balance end plates 4 are also sleeved on rotor shaft 2 respectively, and the two dynamic balance end plates 4 are respectively attached to the two end faces of the four sets of permanent magnet rotor core assemblies 1 stacked on each other. The shoulder 21 at one end of rotor shaft 2 and the locking nut 3 screwed to the other end of rotor shaft 2 fix the two dynamic balance end plates 4 and the four sets of permanent magnet rotor core assemblies 1.

[0075] Sixteen reinforcing rods 5 are evenly inserted and housed in at least two sets of permanent magnet rotor core assemblies 1. The two ends of each reinforcing rod 5 are inserted and housed and fixed on two dynamic balance end plates 4.

[0076] Sixteen reinforcing rods 5 are respectively housed in the reinforcing rod receiving holes A1114 and B1214 of the four sets of permanent magnet rotor core assemblies 1 stacked axially; each of the dynamic balance end plates 4 has a rotor shaft end plate shaft hole 41 at its center position, and the rotor shaft 2 is sleeved and fixed on the rotor shaft end plate shaft hole 41, and the upper left and right walls of each of the dynamic balance end plates 4 correspond to the V-shaped magnet receiving grooves B121 on the rotor core laminations B12. The plastic tank B1211, the lower left and right wall thermosetting potting grooves B1213, and each reinforcing rod receiving hole B1214 are respectively provided with upper left and right potting holes 42, lower left and right potting holes 43, and end plate reinforcing rod receiving holes 44; the potting thermosetting material 14 is respectively poured into the upper left and right potting holes 42 and lower left and right potting holes 43 of the end plate, and each reinforcing rod 5 is respectively housed and fixed in each end plate reinforcing rod receiving hole 44.

[0077] Each lower end thermosetting potting groove A1113 of rotor core lamination A11 and each pair of lower end left and right wall thermosetting potting grooves B1213 of rotor core lamination B12 are all U-shaped structures with a small opening and a large belly. The reinforcing rod receiving hole A1114 and the reinforcing rod receiving hole B1214 are respectively set in the corresponding U-shaped structures.

[0078] The reinforcing rod 5 is made of a non-magnetic and non-conductive non-metallic material, specifically PEEK material; the potting thermosetting material 14 is made of a non-magnetic and non-conductive high-strength injection molding material, specifically EMC material.

[0079] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A permanent magnet rotor core assembly, characterized in that: It includes rotor core lamination A (11), rotor core lamination B (12), magnet (13), and potting thermosetting material (14), all integrally stamped from thin silicon steel sheets. Both rotor core laminations A (11) and B (12) have V-shaped magnetic steel receiving slots evenly distributed in the circumferential direction. The V-shaped magnetic steel receiving slot A (111) of rotor core lamination A (11) is a V-shaped magnetic steel receiving slot without an internal magnetic isolation bridge, while the V-shaped magnetic steel receiving slot B (121) of rotor core lamination B (12) is a V-shaped magnetic steel receiving slot containing an internal magnetic isolation bridge. Rotor core lamination A (11) holds rotor core lamination B (12) between them. The magnet (13) is embedded in the two side walls of each V-shaped magnet receiving groove in the cylindrical space formed by stacking rotor core laminations A (11) and B (12) in the circumferential direction. It also extends axially to fill each V-shaped magnet receiving groove in the cylindrical space formed by stacking rotor core laminations A (11) and B (12). Thermosetting material (14) is filled into the magnet receiving grooves at both ends of each magnet (13) in the cylindrical space formed by stacking rotor core laminations A (11) and B (122). A shaft hole A (112) and a shaft hole B (122) are respectively opened at the center of rotor core laminations A (11) and B (122). The outer ring surfaces of the rotor core laminations A (11) and B (12) are provided with axial long grooves A (1115) and B (1215) corresponding to the magnetic bridge of the upper magnetic pole of each magnet. Asymmetrical long grooves A (1116) and B (1216) are provided on the outer ring surfaces of the rotor core laminations A (11) and B (12) corresponding to the position of the center vertical line between the lower magnetic poles of two adjacent magnets (13) in the V-shaped magnet receiving groove. The permanent magnet rotor core assembly (1) is formed by stacking 2N rotor core laminations B (12) in the middle. The asymmetrical long grooves B (1216) of N rotor core laminations B (12) and the asymmetrical long grooves B (1216) of another N rotor core laminations B (12) are mirror-symmetrically distributed on both sides of the vertical line of the magnetic pole center. The number N of rotor core laminations B (12) is a positive integer. M rotor core laminations A (11) are stacked on both sides of 2N rotor core laminations B (12). The asymmetric long grooves A (1116) of the M rotor core laminations A (11) on each side are distributed on the same side of the magnetic pole center line as the asymmetric long grooves B (1216) of the adjacent stacked N rotor core laminations B (12). The number M of rotor core laminations A (11) is a positive integer, and the number M of rotor core laminations A (11) is greater than the number N of rotor core laminations B (12).

2. The permanent magnet rotor core assembly according to claim 1, characterized in that: The rotor core lamination A (11) has two circumferentially and symmetrically distributed V-shaped magnet receiving grooves A (111) on both the inner and outer sides. Each V-shaped magnet receiving groove A (111) is composed of an upper left and right wall injection molding groove A (1111) and a left and right wall magnet insertion groove A (1112) integrally molded and formed, and a lower thermosetting potting groove A (1113). The upper left and right wall injection molding grooves A (1111) are respectively connected to the upper ends of the left and right wall magnet insertion grooves A (1112), and the lower thermosetting potting groove A (1113) is connected to the upper ends of the left and right wall magnet insertion grooves A (1112). The two ends of 113) are respectively connected to the lower ends of the left and right wall magnet insertion slots A (1112). The magnets (13) are respectively matched and embedded in the left and right wall magnet insertion slots A (1112). The potting thermosetting material (14) is respectively poured into the upper left and right wall injection molding slots A (1111) and the lower thermosetting potting slots A (1113). The rotor core lamination A (11) above the lower thermosetting potting slot A (1113) of each V-shaped magnet receiving slot A (111) is provided with a reinforcing rod receiving hole A (1114).

3. The permanent magnet rotor core assembly according to claim 1, characterized in that: The rotor core lamination B (12) has two layers of V-shaped magnet receiving grooves B (121) evenly and symmetrically distributed in the circumferential direction. Each V-shaped magnet receiving groove B (121) is composed of an upper left and right wall injection molding groove B (1211) and a left and right wall magnet insertion groove B (1212) integrally molded, and a lower left and right wall thermosetting potting groove B (1213). The upper left and right wall injection molding grooves B (1211) are respectively connected to the upper end of the left and right wall magnet insertion grooves B (1212), and the lower left and right wall thermosetting potting grooves B (1213) are respectively connected to the left and right wall magnet insertion grooves. The lower end of B (1212) is separated by silicon steel sheets to form a magnetic bridge between the adjacent ends of the thermosetting potting grooves B (1213) on the left and right walls. The magnets (13) are respectively matched and embedded in the magnet insertion grooves B (1212) on the left and right walls. The thermosetting potting material (14) is respectively poured into the injection molding grooves B (1211) on the upper left and right walls and the thermosetting potting grooves B (1213) on the lower left and right walls. The rotor core lamination B (12) above the magnetic bridge between the thermosetting potting grooves B (1213) on the lower left and right walls of each V-shaped magnet receiving groove B (121) is provided with a reinforcing rod receiving hole B (1214).

4. A permanent magnet motor rotor, characterized in that: It includes at least two sets of permanent magnet rotor core assemblies (1) as described in any one of claims 1-3; it also includes a rotor shaft (2), a locking nut (3), two dynamic balance end plates (4) and several reinforcing rods (5); At least two sets of permanent magnet rotor core assemblies (1) are stacked and sleeved on the rotor shaft (2). Two dynamic balance end plates (4) are also sleeved on the rotor shaft (2) respectively. The two dynamic balance end plates (4) are respectively attached to the two end faces of the at least two sets of permanent magnet rotor core assemblies (1) stacked on each other. The shoulder (21) at one end of the rotor shaft (2) and the locking nut (3) screwed to the other end of the rotor shaft (2) fix the two dynamic balance end plates (4) and the at least two sets of permanent magnet rotor core assemblies (1) together. Several reinforcing rods (5) are evenly inserted into at least two sets of permanent magnet rotor core assemblies (1), and the two ends of each reinforcing rod (5) are inserted into and fixed on two dynamic balance end plates (4).

5. A permanent magnet motor rotor according to claim 4, characterized in that: Several reinforcing rods (5) are respectively housed in the reinforcing rod receiving holes A (1114) and B (1214) of at least two sets of permanent magnet rotor core assemblies (1) stacked axially; each of the dynamic balance end plates (4) has a rotor shaft end plate shaft hole (41) at its center position, the rotor shaft (2) is sleeved and fixed on the rotor shaft end plate shaft hole (41), and each of the dynamic balance end plates (4) corresponds to the upper left and right walls of each V-shaped magnet receiving groove B (121) on the rotor core lamination B (12). The injection molding tank B (1211) and the lower left and right wall thermosetting potting tanks B (1213) and each reinforcing rod receiving hole B (1214) are respectively provided with upper left and right potting holes (42) on the end plate, lower left and right potting holes (43) on the end plate, and end plate reinforcing rod receiving holes (44); the potting thermosetting material (14) is injected into the upper left and right potting holes (42) on the end plate and the lower left and right potting holes (43) on the end plate, and each reinforcing rod (5) is respectively housed and fixed in each end plate reinforcing rod receiving hole (44).

6. A permanent magnet motor rotor according to claim 5, characterized in that: Each lower end thermosetting potting groove A (1113) of rotor core lamination A (11) and each pair of lower end left and right wall thermosetting potting grooves B (1213) of rotor core lamination B (12) are all U-shaped structures with a small opening and a large belly. The reinforcing rod receiving hole A (1114) and the reinforcing rod receiving hole B (1214) are respectively set in the corresponding U-shaped structures.

7. A permanent magnet motor rotor according to claim 6, characterized in that: The reinforcing rod (5) is made of a non-magnetic and non-conductive non-metallic material. The reinforcing rod (5) is made of PEEK material, PC material, acrylic material or bakelite board. The potting thermosetting material (14) is made of a non-magnetic and non-conductive high-strength injection molding material. The potting thermosetting material (14) is made of EMC material.

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