WO2024055610A1

WO2024055610A1 - Permanent magnet rotor core assembly, and electric motor rotor

Info

Publication number: WO2024055610A1
Application number: PCT/CN2023/093037
Authority: WO
Inventors: 孙明冲; 郭守仑; 王斯博; 王金昊; 林展汐; 尹相睿; 李育宽; 于爽
Original assignee: 中国第一汽车股份有限公司
Priority date: 2022-09-13
Filing date: 2023-05-09
Publication date: 2024-03-21
Also published as: CN115473363A

Abstract

Disclosed in the present invention is a permanent magnet rotor core assembly, comprising a rotor core punching sheet A and a rotor core punching sheet B which are integrally stamped and formed by a thin silicon steel sheet, magnetic steel and a potting thermosetting material. Disclosed is a permanent magnet electric motor rotor, comprising at least two permanent magnet rotor core assemblies, and further comprising a rotor shaft, a locking nut, two dynamic balance end plates and a plurality of reinforcing rods. The present invention solves the problem of the rotor strength and the electric motor performance being unable to be taken into account at the same time when a rotor of an existing permanent magnet electric motor is at a high speed, so that high performance of the electric motor is achieved while high speed of the rotor is met; the rotor strength is significantly increased, some magnetic bridges are omitted, an injection molding material is used and the reinforcing rods are inserted to fix the rotor punching sheets and the magnetic steel, so that the stress of the magnetic bridges is further reduced, the mechanical strength and the electromagnetic performance are both taken into account, the magnetic flux leakage is greatly reduced, the torque density is improved, and the power density of the electric motor is further improved; and the design of asymmetric grooves on the surface of the rotor suppresses torque fluctuation and reduces NVH noise of the electric motor.

Description

A permanent magnet rotor core assembly and motor rotor

Technical field

The invention relates to the technical field of permanent magnet motors, and in particular to a permanent magnet rotor core assembly and a motor rotor.

Background technique

With the rapid development of new energy vehicle technology, the performance requirements for vehicle drive motors are getting higher and higher. In order to achieve high performance of the motor, the speed of the motor is getting higher and higher, and the high speed will bring greater stress to the motor structure. Challenge; Since the vehicle drive motor uses a permanent magnet motor, the magnets are mostly arranged in a built-in type, and a magnetic isolation bridge is required to fix the magnets on the rotor core (in the permanent magnet motor, in order to prevent the permanent magnet's flux leakage coefficient from exceeding If the permanent magnets are too large, the utilization rate of the permanent magnets is too low. The magnetic isolation measures taken are: use silicon steel sheets between the two permanent magnets to isolate them. The silicon steel sheets between the two permanent magnets are called magnetic isolation bridges); when When the vehicle drive motor is running at high speed, the rotor generates a large centrifugal force, and there is a risk of fatigue fracture of the magnetic isolation bridge due to stress concentration. In order to ensure the strength of the rotor, the structural size of the magnetic isolation bridge can be increased, but this also increases the load of the motor. Magnetic leakage causes performance degradation such as torque, power factor and efficiency; the current design in the industry cannot take into account the mechanical strength and electromagnetic performance of the motor at high speed, and can only sacrifice the electromagnetic performance to ensure the mechanical strength.

Contents of the invention

In order to solve the above problems, the present invention proposes a permanent magnet rotor core assembly. Its purpose is to solve the current problem that the rotor strength and motor performance cannot be taken into consideration when the rotor of the permanent magnet motor is at high speed, and to achieve high performance of the motor while satisfying the high speed of the rotor; The strength of the rotor has been significantly improved, part of the magnetic isolation bridge has been eliminated, and injection molding materials and reinforcing rods have been inserted to fix the rotor stampings and magnets, thereby further reducing the stress of the magnetic isolation bridge, taking into account both mechanical strength and electromagnetic performance, and greatly reducing The magnetic flux leakage is eliminated, the torque density is increased, and the power density of the motor is further improved; the asymmetric groove design on the rotor surface suppresses torque fluctuations and reduces the NVH noise of the motor itself.

A permanent magnet rotor core assembly of the present invention includes a rotor iron integrally stamped and formed from thin silicon steel sheets. Core punching piece A and rotor core punching piece B also include magnetic steel and potting thermosetting materials;

Both the rotor core punching piece A and the rotor core punching piece B have V-shaped magnetic steel receiving grooves evenly distributed in the circumferential direction, and the V-shaped magnetic steel receiving groove A of the rotor core punching piece A has no internal partitions. The V-shaped magnetic steel receiving groove of the magnetic bridge, the V-shaped magnetic steel receiving groove B of the rotor core punching piece B is a V-shaped magnetic steel receiving groove containing an internal magnetic isolation bridge, and the rotor core assembly is composed of The rotor core punching piece A and the iron core punching piece B sandwiched and fixed in the rotor core punching piece A are composed of the V-shaped magnet steel receiving groove of the rotor core punching piece A without an internal magnetic isolation bridge, and the rotor core punching piece B The V-shaped magnet holding slot of B contains an internal magnetic isolation bridge. It adopts a structure with rotor core punching pieces A at both ends and rotor core punching pieces B in the middle, which greatly reduces magnetic leakage and improves torque density. Improved motor power density;

The magnetic steel is embedded in the groove walls on both sides of each V-shaped magnetic steel receiving groove in the circumferential direction in the cylindrical space formed by the stacking of rotor core punching piece A and rotor core punching piece B, and in the rotor core punching piece A The cylindrical space formed by laminating the rotor core punch piece B extends along the axial direction and fills each V-shaped magnetic steel receiving groove. The potting thermosetting material is potted in the rotor core punch piece A and the rotor core punch piece respectively. In the magnetic steel storage grooves at both ends of each magnet in the cylindrical space formed by stacking sheet B, the role of potting thermosetting material is to reduce the stress of the magnetic bridge, taking into account the mechanical strength and electromagnetic performance to adapt to new energy sources. Automobiles have higher speed requirements for drive motors; shaft holes A and B are respectively opened in the centers of rotor core punching sheets A and rotor core punching sheets B for the rotor shaft to pass through and sleeve into them.

The outer ring surfaces of the rotor core punching pieces A and rotor core punching B are provided with axial long grooves A and long grooves B corresponding to the magnetic isolation bridges of the upper magnetic poles of each magnet steel. On the rotor core punching piece A, Corresponding to the outer ring surface of the rotor core punching piece B, there are axially asymmetric long grooves A and non-symmetrical long grooves A and 1 on one side of the center vertical line between the two magnetic poles adjacent to the lower end of the magnet steel in the V-shaped magnetic steel receiving groove. The function of the symmetrical long groove B, the groove and the asymmetric groove is to better form a non-uniform air gap between the motor rotor and the motor stator, so as to reduce the NVH noise (Noise noise, vibration vibration, Harshness sound) of the motor itself. Vibration roughness) effect is better.

The middle of the permanent magnet rotor core assembly is formed by lamination of 2N pieces of rotor core punching sheets B, in which the asymmetric long groove B of the N pieces of rotor core punching sheets B and the asymmetric long groove B of the other N pieces of rotor core punching sheets B The grooves B are mirror symmetrically distributed on both sides of the vertical line of the center of the magnetic pole. The dislocated structure of the asymmetrical long groove is for Maintain the balance of forces so that a non-uniform air gap can be formed between the motor rotor and the motor stator to reduce NVH noise; the number N of rotor core punching sheets B is a positive integer.

The two sides of the 2N-piece rotor core punching piece B are laminated with the M-piece rotor core punching piece A. The asymmetric long groove A of the M-piece rotor core punching piece A on each side is punched with the adjacent laminated N-piece rotor core punching piece. The asymmetrical long groove B of piece B is distributed on the same side of the magnetic pole center line to increase the strength of each group of rotor core assembly; the number M of rotor core punching pieces A is a positive integer, and the number M of rotor core punching pieces A >The number of rotor core punching sheets B is N.

There are two inner and outer layers of V-shaped magnetic steel holding grooves A evenly and symmetrically distributed in the circumferential direction of the rotor core punching piece A. Each V-shaped magnetic steel holding groove A is formed by an integrally molded upper left and right wall. The injection molding groove A is composed of the left and right wall magnetic steel insertion grooves A and the lower end thermosetting potting groove A; the upper left and right wall injection molding grooves A are connected to the upper ends of the left and right wall magnetic steel insertion grooves A respectively, and the lower end is thermoset The two ends of the potting tank A are connected to the lower ends of the magnetic steel insertion slot A on the left and right walls respectively. There is a connected lower end thermosetting potting tank A between the two magnets instead of silicon steel sheets, eliminating the separation here. The magnetic bridge reduces the stress of the magnetic bridge. The magnetic steel is matched and embedded in the left and right wall magnetic steel insertion slot A. The potting thermosetting material is poured into the upper left and right wall injection molding slot A and the lower end thermosetting potting slot. In A; the lower end of each V-shaped magnetic steel receiving groove A is provided with a reinforcing rod receiving hole A on the rotor core punching piece A above the thermosetting potting groove A to facilitate the stacking of multiple sets of rotor core assemblies. Then the reinforcing rods are inserted to form a squirrel cage structure to increase the strength of the motor rotor at all V-shaped magnetic steel receiving slots A.

There are two inner and outer layers of V-shaped magnetic steel holding grooves B evenly and symmetrically distributed in the circumferential direction of the rotor core punching piece B. Each V-shaped magnetic steel holding groove B is formed by an integrally molded upper left and right wall. The injection molding groove B is composed of the left and right wall magnet steel insertion grooves B and the lower left and right wall thermosetting potting grooves B; the upper left and right wall injection molding grooves B are connected to the upper ends of the left and right wall magnet steel insertion grooves B respectively. , the left and right wall thermosetting potting grooves B at the lower end are connected to the corresponding lower ends of the magnetic steel insertion grooves B on the left and right walls respectively. The adjacent ends of the thermosetting potting groove B on the left and right walls at the lower end are blocked by silicon steel sheets. Magnetic isolation bridge. There is a silicon steel sheet between the two magnets. Since the magnetic isolation bridge is set up, in order to prevent the magnetic leakage coefficient of the permanent magnet from being too large, the magnetic steel is matched and embedded in the left and right wall magnets into slot B. The sealing heat-setting material is poured into the upper left and right wall injection grooves B and lower respectively. In the thermosetting potting grooves B on the left and right walls at the end; on the rotor core punching piece B above the magnetic isolation bridge between the left and right wall thermosetting potting grooves B on the lower end of each V-shaped magnet containing groove B There is a reinforcing rod receiving hole B on the top, so that multiple sets of rotor core assemblies can be stacked and inserted into the reinforcing rod to form a squirrel cage structure, thereby increasing the strength of the motor rotor at all V-shaped magnetic steel receiving grooves B.

The application also provides a motor rotor, which includes at least two sets of permanent magnet rotor core assemblies; and also includes a rotor shaft, a locking nut, two dynamic balance end plates and several reinforcing rods;

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 respectively, and the two dynamic balancing end plates are respectively attached to at least one stack of each other. On both end surfaces of the two sets of permanent magnet rotor core assemblies, the shoulder on one end of the rotor shaft and the lock nut screwed on the other end of the rotor shaft screw together the two dynamic balance end plates and at least two sets of permanent magnet rotor core assemblies. fixed;

Several reinforcing rods are respectively accommodated in at least two sets of axially stacked reinforcing rod accommodating holes A and reinforcing rod accommodating holes B of the permanent magnet rotor core assembly. Both ends of each reinforcing rod penetrate and are accommodated respectively. It is fixed on two dynamically balanced end plates. The two dynamically balanced endplates and several reinforcing rods fixed in the circumferential direction form a squirrel cage structure, which improves the overall strength of the rotor and further reduces the stress of the magnetic isolation bridge.

A rotor shaft end plate shaft hole is opened at the center of each dynamic balancing end plate, the rotor shaft is sleeved and fixed on the rotor shaft end plate shaft hole, and each dynamic balancing end plate corresponds to the rotor core punching piece B The upper left and right wall injection molding grooves B and the lower left and right wall thermosetting potting grooves B of each V-shaped magnetic steel holding groove B, as well as the upper end plates of each reinforcing rod holding hole B, are respectively provided. The left and right potting holes, the left and right potting holes at the lower end of the end plate, and the end plate reinforcing rod receiving holes; the potting thermosetting materials are respectively poured into the left and right potting holes at the upper end of the end plate and the left and right potting holes at the lower end of the end plate. And each reinforcing rod is accommodated and fixed in the reinforcing rod receiving hole of each end plate. The potting of thermosetting materials and reinforcing rods enhances the overall strength of the rotor, so that when the rotor rotates at high speed in the stator, there will be no magnetic bridge due to The stress caused the silicon steel sheet near the V-shaped magnet steel holding slot to break and fall off from the rotor core punching piece A and rotor core punching piece B, damaging the drive motor; the inner and outer V-shaped magnet steel holding slots A and The direction of the two circles of reinforcing rods that penetrate the upper part of the V-shaped magnet steel storage groove B is parallel to the axial direction, instead of penetrating the two layers of V-shaped magnet steel storage grooves, so that the magnetic reluctance torque will not be cut off. path, ensuring the smooth magnetic path of the reluctance torque and improving performance.

The thermoset potting grooves A at each lower end of the rotor core punching piece A and the left and right wall thermoset potting grooves B at the lower ends of each pair of the rotor core punching piece B are all in a concave-shaped structure with a small mouth and a large belly, and the reinforcement rod is accommodated Hole A and reinforcing rod receiving hole B are respectively set in corresponding concave-shaped structures. One of the purposes of setting up the concave-shaped structures is to limit the lower ends of the magnets embedded in the magnetic steel insertion slots on the left and right walls. The second purpose is It acts as a reinforcing rib to increase the strength of the circumferential silicon steel sheet of the V-shaped magnetic steel receiving groove and prevent the silicon steel sheet from breaking due to stress.

The material of the reinforcing rod is a non-metallic material that is non-magnetic and non-conductive. The material of the reinforcing rod is PEEK material (polyetheretherketone), PC material (polycarbonate), acrylic material or bakelite. The reinforcing rod is made of insulating non-metallic material. Magnetic conductive materials do not cause severe heating and reduced efficiency caused by eddy current loss; the material of the potting thermosetting material is a high-strength injection molding material that is neither magnetic nor electrically conductive, and the material of the potting thermosetting material is an EMC material ( Epoxy Molding Compound epoxy resin molding compound, epoxy plastic sealing compound).

beneficial effects

The invention solves the current problem that the rotor strength and motor performance cannot be balanced when the rotor of a permanent magnet motor is at high speed, and achieves high performance of the motor while satisfying the high speed of the rotor; the rotor strength is significantly improved, part of the magnetic bridge is eliminated, and injection molding materials are used and reinforcing rods are inserted. , forming the fixation of the rotor stamping and the magnet steel, thereby further reducing the stress of the magnetic bridge, taking into account the mechanical strength and electromagnetic performance, greatly reducing the magnetic leakage, increasing the torque density, and further improving the power density of the motor; the rotor surface The asymmetric groove design suppresses torque ripple and reduces the NVH noise of the motor itself.

Description of drawings

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

Figure 2 is a schematic front structural view of the permanent magnet rotor core assembly of the present invention.

Figure 3 is a schematic structural diagram of the rotor core punched piece A of the present invention.

Figure 4 is a schematic structural diagram of the rotor core punched piece B of the present invention.

Figure 5 is a schematic diagram of the overall structure of the motor rotor of the present invention.

Figure 6 is a schematic cross-sectional structural diagram of the overall motor rotor of the present invention.

FIG. 7 is a schematic diagram of the structure of the dynamic balancing end plate of the present invention.

Figure 8 is a partial structural diagram of the motor rotor of the present invention. In the picture:

1. Permanent magnet rotor core assembly;

11. Rotor core punching piece A;

111. V-shaped magnetic steel storage tank A;

1111. Injection molding groove A on the left and right walls of the upper end;

1112. The magnetic steel on the left and right walls is inserted into slot A;

1113. Lower end thermosetting potting tank A;

1114. Reinforcement rod receiving hole A;

1115. Long groove A;

1116. Asymmetrical long groove A;

112. Shaft hole A;

12. Rotor core punching piece B;

121. V-shaped magnetic steel storage tank B;

1211. Injection molding groove B on the left and right walls of the upper end;

1212. The magnetic steel on the left and right walls is inserted into slot B;

1213. Heat-set potting groove B on the left and right walls of the lower end;

1214. Reinforcement rod receiving hole B;

1215. Long groove B;

1216. Asymmetrical long groove B;

122. Shaft hole B;

13. Magnetic steel;

14. Potting thermosetting materials;

2. Rotor shaft;

21. Shaft shoulder;

3. Locking nut;

4. Two dynamically balanced end plates;

41. Rotor shaft end plate shaft hole;

42. The left and right potting holes on the upper end plate;

43. The left and right potting holes at the lower end of the end plate;

44. End plate reinforcement rod receiving hole;

5. Strengthen the rod.

Detailed ways

In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved more clearly, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and through specific implementation modes. It can be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for convenience of description, only some but not all parts related to the present invention are shown in the drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limitations of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

In the description of the present invention, it should be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection. Connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

Example 1

Referring to Figures 1 to 4, a permanent magnet rotor core assembly 1 includes rotor core punching pieces A11 and rotor core punching pieces B12 that are integrally stamped from thin silicon steel sheets, and also includes magnet steel 13 and potted thermosetting Material 14;

The rotor core punching piece A11 and the rotor core punching piece B12 both have V-shaped magnetic steel receiving grooves evenly distributed in the circumferential direction, and the V-shaped magnetic steel receiving groove A111 of the rotor core punching piece A11 has no internal partition. The V-shaped magnet steel receiving groove of the magnetic bridge, the V-shaped magnetic steel receiving groove B121 of the rotor core punching piece B121 is a V-shaped magnet steel receiving groove containing an internal magnetic isolation bridge, and the rotor core punching piece A11 connects the rotor The iron core punch B12 is clamped in between;

The magnetic steel 13 is embedded in the groove walls on both sides of each V-shaped magnet receiving groove in the circumferential direction in the cylindrical space formed by the stacking of the rotor core punching piece A11 and the rotor core punching piece B12, and is inserted into the rotor core punching piece. The cylindrical space formed by lamination of A11 and rotor core punching piece B12 extends axially and is filled with each V-shaped magnetic steel receiving groove. The potting thermosetting material 14 is potted on the rotor core punching piece A11 and the rotor respectively. The magnetic steel receiving grooves at both ends of each magnet 13 in the cylindrical space formed by stacking the core punching pieces B12; the rotor core punching pieces A11 and the rotor core punching pieces B12 are respectively provided with shaft holes A112 and axial holes. B122.

The outer ring surface of the rotor core punching piece A11 and the rotor core punching piece B12 is provided with an axial long groove A113 and a long groove B123 at the magnetic isolation bridge of the upper magnetic pole of each magnet 13. The rotor core punching piece is The outer ring surfaces of A11 and rotor core punching piece B12 are respectively provided with axial asymmetrical long grooves A1116 on one side of the center vertical line between the two magnetic poles adjacent to the lower end of the magnet steel 13 in the V-shaped magnet steel receiving groove. and asymmetric long groove B1216.

The middle of the permanent magnet rotor core assembly 1 is formed by lamination of 2N rotor core punching sheets B12, in which the asymmetric long groove B1216 of the N rotor core punching sheets B12 and the asymmetric long groove B1216 of the other N rotor core punching sheets B12 The long grooves B1216 are mirror-symmetrically distributed on both sides of the vertical line of the center of the magnetic pole; the number N of the rotor core punching pieces B12 is a positive integer.

The two sides of the 2N-piece rotor core punching piece B12 are respectively laminated with the M-piece rotor core punching piece A11. The asymmetric long groove A1116 of the M-piece rotor core punching piece A11 on each side is punched with the adjacent laminated N-piece rotor core punching piece. The asymmetric long grooves B1216 of the piece B12 are distributed on the same side of the magnetic pole centerline; the number M of the rotor core punching pieces A11 is a positive integer, and the number M of the rotor core punching pieces A11 > the number N of the rotor core punching pieces B12.

There are two layers of V-shaped magnetic steel receiving grooves A111 distributed evenly and symmetrically around the circumferential direction of the rotor core punching piece A11. Each V-shaped magnetic steel receiving groove A111 is formed by an integrally molded upper left and right wall. The injection molding groove A1111 is composed of the left and right wall magnetic steel insertion grooves A1112 and the lower end thermosetting potting groove A1113; the upper left and right wall injection molding grooves A1111 are respectively connected to the upper ends of the left and right wall magnetic steel insertion grooves A1112, and the lower end is thermoset The two ends of the potting tank A1113 are connected to the lower ends of the left and right wall magnet steel insertion slots A1112 respectively. The magnets 13 are matched and embedded in the left and right wall magnet steel insertion slots A1112 respectively. The potting thermosetting material 14 is poured into the upper left side respectively. , the injection molding groove A1111 on the right wall and the heat-setting potting groove A1113 at the lower end; each V-shaped magnetic steel storage groove A111 has a reinforcing rod on the rotor core punching piece A11 above the heat-setting potting groove A1113 at the lower end. Hole A1114.

There are two inner and outer layers of V-shaped magnetic steel receiving grooves B121 evenly and symmetrically distributed in the circumferential direction of the rotor core punching piece B12. Each V-shaped magnetic steel receiving groove B121 is formed by an integrally molded upper left and right wall. The injection molding groove B1211 is composed of the left and right wall magnet steel insertion grooves B1212 and the lower left and right wall heat-setting potting grooves B1213; the upper left and right wall injection molding grooves B1211 are respectively connected to the upper ends of the left and right wall magnet steel insertion grooves B1212. , the lower end left and right wall thermosetting potting grooves B1213 are connected to the corresponding lower ends of the left and right wall magnetic steel insertion grooves B1212, and the adjacent ends of the lower left and right wall thermosetting potting grooves B1213 are blocked by silicon steel sheets. In the magnetic isolation bridge, the magnets 13 are matched and embedded in the left and right wall magnet insertion slots B1212, and the potting thermosetting material 14 is poured into the upper left and right wall injection molding slots B1211 and the lower left and right wall thermosetting potting slots B1213. Center; The rotor core punching piece B12 above the magnetic isolation bridge between the left and right wall thermosetting potting grooves B1213 at the lower end of each V-shaped magnet steel receiving groove B121 is provided with a reinforcing rod receiving hole B1214.

Example 2

Referring to Figures 1 to 8, a permanent magnet motor rotor is different from Embodiment 1 in that:

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

Four sets of permanent magnet rotor core assemblies 1 are stacked and sleeved on the rotor shaft 2. Two dynamic balancing end plates 4 are also sleeved on the rotor shaft 2. The two dynamic balancing end plates 4 are respectively attached to the two end surfaces of the four sets of permanent magnet rotor core assemblies 1 stacked on each other. The shaft shoulder 21 at one end of the rotor shaft 2 and the shaft shoulder 21 screwed on the other end of the rotor shaft 2 are respectively attached to the two end surfaces of the four sets of permanent magnet rotor core assemblies 1 stacked on each other. The locking nuts 3 at the ends screw the two dynamic balancing end plates 4 and the four sets of permanent magnet rotor core assemblies 1 together;

Sixteen reinforcing rods 5 are evenly penetrated and accommodated in at least two sets of permanent magnet rotor core assemblies 1. Both ends of each reinforcing rod 5 are penetrated and accommodated and fixed on two dynamic balance end plates 4 respectively.

Sixteen reinforcing rods 5 are respectively accommodated in the axially stacked reinforcing rod accommodating holes A1114 and B1214 of the four sets of permanent magnet rotor core assemblies 1; the center position of each dynamic balance end plate 4 is There is a rotor shaft end plate shaft hole 41, the rotor shaft 2 is sleeved and fixed on the rotor shaft end plate shaft hole 41, and each of the dynamically balanced end plates 4 corresponds to each V shape on the rotor core punching piece B12 The upper left and right wall injection molding slots B1211 of the magnetic steel storage slot B121, the lower left and right wall thermosetting potting slots B1213, and each reinforcing rod accommodation hole B1214 are respectively provided with the upper left and right potting holes on the end plate. 42 and the left and right potting holes 43 at the lower end of the end plate and the end plate reinforcing rod receiving holes 44; the potting thermosetting material 14 is poured into the left and right potting holes 42 at the upper end of the end plate and the left and right potting holes 43 at the lower end of the end plate, respectively. And each reinforcing rod 5 is accommodated and fixed in each end plate reinforcing rod receiving hole 44 respectively.

The thermosetting potting grooves A1113 at each lower end of the rotor core punching piece A11 and the thermosetting potting grooves B1213 at the left and right walls of each pair of lower ends of the rotor core punching piece B12 are all in a concave-shaped structure with a small mouth and a large belly, and the reinforcement rod is accommodated The hole A1114 and the reinforcing rod receiving hole B1214 are respectively provided in corresponding concave-shaped structures.

The material of the reinforcing rod 5 is a non-metallic material that is non-magnetic and non-conductive, and the material of the reinforcing rod 5 is PEEK material; the material of the potting thermosetting material 14 is a high-strength injection molding material that is non-magnetic and non-conductive. The material of the sealing thermosetting material 14 is EMC material.

Although the invention has been specifically shown and described in conjunction with preferred embodiments, it will be apparent to those skilled in the art that the invention can be modified in form and detail without departing from the spirit and scope of the invention as defined by the appended claims. Various changes are made within the scope of the present invention.

Claims

A permanent magnet rotor core assembly, which is characterized by: including a rotor core punching piece A (11), a rotor core punching piece B (12), a magnetic steel (13) and a potting thermosetting Material(14);

The rotor core punching piece A (11) and the rotor core punching piece B (12) both have V-shaped magnet receiving grooves evenly distributed in the circumferential direction, and the V-shaped magnetic steel receiving grooves of the rotor core punching piece A (11) The steel receiving groove A (111) is a V-shaped magnetic steel receiving groove without an internal magnetic isolation bridge. The V-shaped magnetic steel receiving groove B (121) of the rotor core punch B (12) is a V-shaped magnetic steel receiving groove with an internal magnetic isolation bridge. The V-shaped magnetic steel receiving groove of the bridge, the rotor core punching piece A (11) clamps the rotor core punching piece B (12);

The magnetic steel (13) is embedded in the two side walls of each V-shaped magnetic steel receiving groove in the circumferential direction in the cylindrical space formed by laminating the rotor core punching piece A (11) and the rotor core punching piece B (12). , and inside the cylindrical space formed by the stacking of rotor core punching pieces A (11) and rotor core punching pieces B (12), each V-shaped magnetic steel containing groove extends along the axial direction and is potted with heat. The solid material (14) is potted into the magnetic steel receiving grooves at both ends of each magnet (13) in the cylindrical space formed by the stacked rotor core punching pieces A (11) and rotor core punching pieces B (12). ; The rotor core punching piece A (11) and the rotor core punching piece B (12) are respectively provided with shaft holes A (112) and shaft holes B (122).
A permanent magnet rotor core assembly according to claim 1, characterized in that: the outer ring surfaces of the rotor core punching pieces A (11) and rotor core punching pieces B (12) correspond to the upper magnetic poles of each magnet steel. There are axial long grooves A (1115) and long grooves B (1215) at the magnetic isolation bridge. The outer ring surfaces of the rotor core punching piece A (11) and the rotor core punching piece B (12) correspond to V An axial asymmetric long groove A (1116) and an asymmetric long groove B (1116) are respectively provided on one side of the center vertical line between the two magnetic poles adjacent to the lower end of the magnet steel (13) in the font-shaped magnet steel accommodating groove. 1216).
A permanent magnet rotor core assembly according to claim 2, characterized in that: the middle of the permanent magnet rotor core assembly (1) is laminated and formed by 2N rotor core punching sheets B (12), wherein N The asymmetric long groove B (1216) of the rotor core punch B (12) and the asymmetric long groove B (1216) of the other N rotor core punch B (12) are mirror symmetrically distributed on the perpendicular line of the magnetic pole center. On both sides; the number N of rotor core punching sheets B (12) is a positive integer.
A permanent magnet rotor core assembly according to claim 3, characterized in that: M-piece rotor core punching pieces A (11) are laminated on both sides of the 2N-piece rotor core punching piece B (12), wherein each side The asymmetric long groove A (1116) of the M-piece rotor core punching piece A (11) and the adjacent laminated N-piece rotor The asymmetrical long groove B (1216) of the core punch B (12) is distributed on the same side of the magnetic pole center line; the number M of the rotor core punch A (11) is a positive integer, and the rotor core punch A (11) The quantity M>the quantity N of the rotor core punching sheets B (12).
A permanent magnet rotor core assembly according to claim 2, characterized in that: the rotor core punching piece A (11) is evenly and symmetrically distributed in the circumferential direction with two inner and outer layers of V-shaped magnetic steel receiving grooves A. (111), each V-shaped magnet receiving slot A (111) consists of an integrally molded upper left and right wall injection slot A (1111), a left and right wall magnet insertion slot A (1112) and a lower end The thermosetting potting groove A (1113) is formed; the upper left and right wall injection molding grooves A (1111) are respectively connected to the upper ends of the left and right wall magnetic steel insertion grooves A (1112), and the lower end thermosetting potting groove A (1113) ) are connected to the lower ends of the magnetic steel insertion slots A (1112) on the left and right walls respectively. The magnets (13) are matched and embedded in the magnetic steel insertion slots A (1112) on the left and right walls respectively, and the thermosetting material (13) is potted 14) Pour into the upper left and right wall injection molding grooves A (1111) and the lower thermosetting potting groove A (1113) respectively; the lower end of each V-shaped magnetic steel holding groove A (111) is thermosetting potting A reinforcing rod receiving hole A (1114) is provided on the rotor core punching piece A (11) above the slot A (1113).
A permanent magnet rotor core assembly according to claim 2, characterized in that: there are two inner and outer layers of V-shaped magnetic steel receiving grooves B evenly and symmetrically distributed in the circumferential direction of the rotor core punching piece B (12). (121), each V-shaped magnet receiving slot B (121) is composed of an integrally molded upper left and right wall injection slot B (1211), a left and right wall magnet insertion slot B (1212) and a lower end The left and right walls are composed of thermosetting potting grooves B (1213); the upper left and right wall injection molding grooves B (1211) are respectively connected to the upper ends of the magnetic steel insertion grooves B (1212) on the left and right walls, and the lower left and right walls The thermosetting potting groove B (1213) is connected to the corresponding lower end of the magnetic steel insertion groove B (1212) on the left and right walls respectively. The adjacent ends of the thermosetting potting groove B (1213) on the left and right walls of the lower end are covered by silicon steel. The magnetic steel (13) is matched and embedded in the left and right wall magnetic steel insertion slots B (1212), and the potting thermosetting material (14) is poured into the upper left and right wall injection molding slots B (1211) respectively. ) and the left and right wall thermosetting potting grooves B (1213) at the lower end; between the left and right wall thermosetting potting grooves B (1213) at the lower end of each V-shaped magnetic steel containing groove B (121) The rotor core punching piece B (12) above the magnetic isolation bridge is provided with a reinforcing rod receiving hole B (1214).
A permanent magnet motor rotor, characterized in that: it includes at least two sets of permanent magnet rotor core assemblies (1) according to any one of claims 1-6; it also includes a rotor shaft (2), a locking nut ( 3), two dynamically balanced 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, and the two dynamic balance end plates (4) are also sleeved on the rotor shaft (2). The balanced end plates (4) are fitted separately On the two end surfaces of at least two sets of mutually stacked permanent magnet rotor core assemblies (1), the shoulder (21) at one end of the rotor shaft (2) and the locking nut (21) screwed to the other end of the rotor shaft (2) 3) Screw the two dynamic balance end plates (4) and at least two sets of permanent magnet rotor core assemblies (1) together;

Several reinforcing rods (5) are uniformly penetrated and accommodated in at least two sets of permanent magnet rotor core assemblies (1). Both ends of each reinforcing rod (5) are penetrated respectively and accommodated and fixed on two pieces of dynamic balance. onto the end plate (4).
A permanent magnet motor rotor according to claim 7, characterized in that: a plurality of reinforcing rods (5) are respectively accommodated in at least two groups of axially stacked reinforcing rods of the permanent magnet rotor core assembly (1). In hole A (1114) and reinforcing rod accommodation hole B (1214); a rotor shaft end plate shaft hole (41) is provided at the center of each dynamic balance end plate (4), and the rotor shaft (2) is sleeved and fixed on the shaft hole (41) of the rotor shaft end plate, and each piece of the dynamic balancing end plate (4) corresponds to each V-shaped magnetic steel receiving groove B (121) on the rotor core punching piece B (12) ), the upper left and right wall injection molding grooves B (1211) and the lower left and right wall heat-setting potting grooves B (1213), as well as each reinforcing rod accommodation hole B (1214), are respectively provided with the upper left and right end plates. The potting holes (42), the left and right potting holes (43) at the lower end of the end plate, and the end plate reinforcing rod receiving holes (44); the potting thermosetting material (14) is poured into the left and right potting holes (43) at the upper end of the end plate respectively. 42) and the left and right potting holes (43) at the lower end of the end plate, and each reinforcing rod (5) is accommodated and fixed in each end plate reinforcing rod receiving hole (44).
A permanent magnet motor rotor according to claim 8, characterized in that: each lower end thermosetting potting groove A (1113) of the rotor core punching piece A (11) and each lower end of the rotor core punching piece B (12) The heat-setting potting grooves B (1213) on the left and right walls of the lower end have a concave-shaped structure with a small mouth and a large belly. The reinforcing rod accommodating hole A (1114) and the reinforcing rod accommodating hole B (1214) are respectively provided at the corresponding Within the concave structure.
A permanent magnet motor rotor according to claim 9, characterized in that: the material of the reinforcing rod (5) is a non-metallic material that is non-magnetic and non-conductive, and the material of the reinforcing rod (5) is PEEK material, PC material, acrylic material or bakelite board; the material of the potting thermosetting material (14) is a high-strength injection molding material that is non-magnetic and non-conductive, and the material of the potting thermosetting material (14) is an EMC material.