A permanent magnet rotor assembly and a motor

Abstract

The present invention discloses a permanent magnet rotor assembly and a motor, the permanent magnet rotor assembly comprises a plurality of permanent magnets, a rotor core assembly, a rotating shaft and a plastic sealing body, the rotor core assembly comprises a mounting bracket and a plurality of magnetic conductive blocks, the mounting bracket comprises an annular end plate and a plurality of clamping blocks axially protruding from one end face of the annular end plate, the plurality of clamping blocks are spaced and distributed around the annular end plate, a clamping groove is arranged on the magnetic conductive block, a plurality of magnetic conductive blocks are installed and formed into a center hole through the matching of the clamping block and the clamping groove, a radial groove is formed between two adjacent magnetic conductive blocks, a permanent magnet is nested in the radial groove, the rotating shaft passes through the center hole, and the plastic sealing body plastic seals the rotating shaft, the plurality of permanent magnets, the mounting bracket and the plurality of magnetic conductive blocks into one body. It uses the mounting bracket to fix the plurality of magnetic conductive blocks and the permanent magnet, and the overall structural strength is good, not easy to deform, the injection molding quality is good, the production efficiency is high, and the waste is very low.

Description

Technical field:

[0001] The invention relates to a permanent magnet rotor assembly and a motor. Background technology:

[0002] like Figure 1 As shown, the conventional permanent magnet rotor assembly includes: a permanent magnet 1a and a rotor core 2a, wherein the rotor core 2a includes an annular ring 22a provided with a central shaft hole 21a and a plurality of magnetic conductive blocks 23a protruding from the outer side of the annular ring 22a, and a radial groove 24a is formed between two adjacent magnetic conductive blocks 23a, and the permanent magnet 1a is embedded in the radial groove 24a. This structure has the following disadvantages: 1) the rotating shaft is installed in the central shaft hole 21a, and the rotating shaft is rigidly connected to the annular ring 22a, resulting in poor shock absorption effect; 2) the rotor core 2a has a large diameter, many consumables, and a large weight, resulting in high cost.

[0003] In view of this, in order to solve the existing technical problems, the rotor core part of the current permanent magnet rotor assembly directly omits the annular ring 22a, and directly seals the magnetic block 23a, the permanent magnet 1a and the rotating shaft into a whole by direct injection molding. This can greatly reduce costs and achieve a certain shock absorption effect. However, due to the independent structure of the magnetic block 23a, after matching with the permanent magnet (magnetic tile), although it can also be formed, this molding is not very stable, easy to loosen, and difficult to put into the mold for the next step of injection molding, which affects the quality of injection molding, has a high scrap rate, and has low production efficiency, which is not conducive to large-scale production. Summary of the invention:

[0004] The purpose of the present invention is to provide a permanent magnet rotor assembly and a motor, so as to solve the technical problems in the prior art that the magnetic conductive block and the permanent magnet of the permanent magnet rotor assembly are not firmly combined, resulting in poor injection molding quality, low production efficiency and high scrap rate.

[0005] The purpose of the present invention is achieved through the following technical solutions:

[0006] A permanent magnet rotor assembly comprises a plurality of permanent magnets, a rotor core assembly, a rotating shaft and a plastic sealing body, characterized in that: the rotor core assembly comprises a mounting bracket and a plurality of magnetic conductive blocks, the mounting bracket comprises an annular end plate and a plurality of clamping blocks axially protruding from one end surface of the annular end plate, the plurality of clamping blocks are spaced around the annular end plate, a clamping groove is arranged on the magnetic conductive block, a plurality of magnetic conductive blocks are mounted through the clamping block and the clamping groove to form a center hole, a radial groove is formed between two adjacent magnetic conductive blocks, a permanent magnet is nested in the radial groove, the rotating shaft passes through the center hole, and the plastic sealing body plastic-seals the rotating shaft, the plurality of permanent magnets, the mounting bracket and the plurality of magnetic conductive blocks into one body.

[0007] The above-mentioned card block is a V-shaped card block, and a notch is arranged in the middle of the V-shaped card block.

[0008] The above-mentioned mounting bracket is a plastic part.

[0009] The above-mentioned card block is in the shape of a flat block, and the cross section of the card slot is in the shape of a flat rectangle.

[0010] First hooks protrude from the magnetic conductive blocks on both sides of the outer opening of the radial groove, and second hooks protrude from the magnetic conductive blocks on both sides of the inner opening of the radial groove, and the permanent magnet is clamped between the first hook and the second hook.

[0011] The annular end plate also has an annular boss axially protruding, the annular boss and the clamping block are respectively located on both sides of the annular end plate, the magnetic ring is sleeved on the outside of the annular boss, and the plastic sealing body plastic-seals the mounting bracket and the magnetic ring together.

[0012] The plastic package body described above includes an upper end plate, a lower end plate and a central connecting column. The upper end plate and the lower end plate are respectively located at the two ends of the rotor core assembly. The central connecting column is connected between the rotating shaft and the magnetic conductive block and the permanent magnet. The two ends of the central connecting column are respectively connected to the upper end plate and the lower end plate.

[0013] The above-mentioned plastic sealing body also includes a peripheral connecting rib, the two ends of which are respectively connected to the upper end plate and the lower end plate, and the peripheral connecting rib is sealed at the outer opening.

[0014] The outer side surface of the magnetic conductive block is exposed from the plastic package body, and the annular end plate is in contact with the end surface of the magnetic conductive block.

[0015] A motor comprises a stator assembly, a permanent magnet rotor assembly and a motor housing, wherein the permanent magnet rotor assembly is the permanent magnet rotor assembly described above.

[0016] Compared with the prior art, the present invention has the following effects:

[0017] 1) The rotor core assembly of the present invention includes a mounting bracket and a plurality of magnetic conductive blocks. The mounting bracket includes an annular end plate and a plurality of clamping blocks axially protruding from one end face of the annular end plate. The plurality of clamping blocks are spaced around the annular end plate. A clamping slot is provided on the magnetic conductive block. The plurality of magnetic conductive blocks are installed and formed into a center hole through the cooperation of the clamping block and the clamping slot. A radial groove is formed between two adjacent magnetic conductive blocks. The permanent magnet is nested in the radial groove. The rotating shaft passes through the center hole. The plastic sealing body plastic seals the rotating shaft, the plurality of permanent magnets, the mounting bracket and the plurality of magnetic conductive blocks into one. The mounting bracket is used to fix the plurality of magnetic conductive blocks and permanent magnets. The overall structural strength is good, not easy to deform, and it is convenient to put into the mold for injection molding. The injection molding quality is good, the production efficiency is high, and the scrap is very low.

[0018] 2) Other advantages of the present invention are described in detail in the embodiment section. Description of the drawings:

[0019] Figure 1 It is a structural schematic diagram of a permanent magnet rotor assembly in the prior art;

[0020] Figure 2 is a three-dimensional diagram of a permanent magnet rotor assembly according to Embodiment 1 of the present invention;

[0021] Figure 3 is an exploded view of a permanent magnet rotor assembly according to Embodiment 1 of the present invention;

[0022] Figure 4 is a front view of the permanent magnet rotor assembly of the first embodiment of the present invention;

[0023] Figure 5 yes Figure 4 AA section view;

[0024] Figure 6 yes Figure 4 BB cross-sectional view;

[0025] Figure 7 is an exploded view of the first embodiment of the present invention after omitting the plastic sealing body;

[0026] Figure 8 This is a three-dimensional diagram of the first embodiment of the present invention after omitting the plastic sealing body and the rotating shaft;

[0027] Fig. 9 It is a top view of the first embodiment of the present invention with the plastic package body and the rotating shaft omitted. Specific implementation method:

[0028] The present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0029] Embodiment 1:

[0030] Embodiment 1: Figures 2 to 9 As shown, the present invention is a permanent magnet rotor assembly, comprising a plurality of permanent magnets 1, a rotor core assembly 2, a rotating shaft 3 and a plastic sealing body 4, wherein the rotor core assembly 2 comprises a mounting bracket 21 and a plurality of magnetic conductive blocks 22, wherein the mounting bracket 21 comprises an annular end plate 210 and a plurality of clamping blocks 211 axially protruding from one end surface of the annular end plate 210, wherein the plurality of clamping blocks 211 are spaced apart around the annular end plate 210, and a clamping groove 221 is provided on the magnetic conductive block 22, wherein the plurality of magnetic conductive blocks 22 are mounted and formed with the clamping blocks 211 and the clamping groove 221 to form a center hole 24, and a radial groove 23 is formed between two adjacent magnetic conductive blocks 22, wherein the permanent magnet 1 is nested in the radial groove 23, and the rotating shaft 3 passes through the center hole 24, and the plastic sealing body 4 plastic seals the rotating shaft 3, the plurality of permanent magnets 1, the mounting bracket 21 and the plurality of magnetic conductive blocks 22 into one body. The mounting bracket 21 is used to fix a plurality of magnetic blocks 22 and the permanent magnet 1. The overall structure has good strength and is not easily deformed. It is convenient to put it into a mold for injection molding. The injection molding quality is good, the production efficiency is high, and the waste is very low.

[0031] The above-mentioned block 211 is a V-shaped block, and a notch 2110 is set in the middle of the V-shaped block. The mounting bracket 21 is a plastic part. The notch 2110 allows the block 211 to be easily deformed and squeezed into the slot 221, which fixes the magnetic block 22 well and is not easy to loosen. The block 211 is a flat block, and the cross-section of the slot 221 is a flat rectangle. The structure is simple, the manufacturing is convenient, and it is easy to install.

[0032] The first blocking hooks 26 protrude from the magnetic blocks 22 on both sides of the outer opening 25 of the radial groove 23, and the second blocking hooks 28 protrude from the magnetic blocks 22 on both sides of the inner opening 27 of the radial groove 23. The permanent magnet 1 is clamped between the first blocking hooks 26 and the second blocking hooks 28, and the permanent magnet 1 is firmly and reliably fixed, which is convenient for injection molding.

[0033] The annular end plate 210 also has an annular boss 212 axially protruding, the annular boss 212 and the clamping block 211 are respectively located on both sides of the annular end plate 210, the magnetic ring 5 is sleeved on the outer side of the annular boss 212, and the plastic sealing body 4 plastic seals the mounting bracket 21 and the magnetic ring 5 together. The structure is simple, the integrity is strong, the installation is convenient, and it is convenient for integral injection molding.

[0034] The plastic package body 4 described above includes an upper end plate 41, a lower end plate 42 and a central connecting column 43. The upper end plate 41 and the lower end plate 42 are respectively located at the two ends of the rotor core assembly 2. The central connecting column 43 is connected between the rotating shaft 3 and the magnetic block 22 and the permanent magnet 1. The two ends of the central connecting column 43 are respectively connected to the upper end plate 41 and the lower end plate 42. The central connecting column 43 is connected between the rotating shaft 3 and the magnetic block 22 and the permanent magnet 1, which has a good shock absorption effect and a low manufacturing cost. At the same time, the radial size of the rotor core assembly 2 can be greatly reduced, which greatly reduces the manufacturing cost.

[0035] The plastic package body 4 further comprises a peripheral connecting rib 44 , the two ends of which are respectively connected to the upper end plate 41 and the lower end plate 42 . The peripheral connecting rib 44 is sealed at the outer opening 25 , which has better structural strength and better fixing effect on the permanent magnet 1 .

[0036] The outer side surface 220 of the magnetic conductive block 22 is exposed from the plastic package body 4, and the annular end plate 210 is in contact with the end surface of the magnetic conductive block 22, so the installation is simple and convenient.

[0037] Embodiment 2:

[0038] This embodiment provides a motor, including a stator assembly, a permanent magnet rotor assembly and a motor housing, characterized in that the permanent magnet rotor assembly is the permanent magnet rotor assembly described in the first embodiment.

[0039] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited thereto. Any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principle of the present invention are all equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A permanent magnet rotor assembly, comprising a plurality of permanent magnets (1), a rotor core assembly (2), a rotating shaft (3) and a plastic package (4), characterized in that: The rotor core assembly (2) comprises a mounting bracket (21) and a plurality of magnetic conductive blocks (22), wherein the mounting bracket (21) comprises an annular end plate (210) and a plurality of clamping blocks (211) axially protruding from one end surface of the annular end plate (210), wherein the plurality of clamping blocks (211) are spaced apart and distributed around the annular end plate (210), and a clamping groove (221) is provided on the magnetic conductive block (22), and the plurality of magnetic conductive blocks (22) are connected to the magnetic conductive block (211) through the clamping block (211) and the clamping groove (221). The plurality of permanent magnets (1) are mounted together to form a center hole (24), a radial groove (23) is formed between two adjacent magnetic conductive blocks (22), the permanent magnet (1) is nested in the radial groove (23), the rotating shaft (3) passes through the center hole (24), the plastic sealing body (4) plastic seals the rotating shaft (3), the plurality of permanent magnets (1), the mounting bracket (21) and the plurality of magnetic conductive blocks (22) into one body, and the mounting bracket (21) is used to fix the plurality of magnetic conductive blocks (22) and the permanent magnet (1); The plastic package body (4) comprises an upper end plate (41), a lower end plate (42) and a central connecting column (43); the upper end plate (41) and the lower end plate (42) are respectively located at two ends of the rotor core assembly (2); the central connecting column (43) is connected between the rotating shaft and the magnetic conductive block (22) and the permanent magnet (1); and the two ends of the central connecting column (43) are respectively connected to the upper end plate (41) and the lower end plate (42); The above-mentioned card block (211) is a V-shaped card block, a notch (2110) is arranged in the middle of the V-shaped card block, the mounting bracket (21) is a plastic part, and the notch (2110) causes the card block (211) to deform and squeeze into the card slot (221) to fix the magnetic conductive block (22); The annular end plate (210) also has an annular boss (212) protruding axially, the annular boss (212) and the clamping block (211) are respectively located on both sides of the annular end plate (210), the magnetic ring (5) is sleeved on the outside of the annular boss (212), and the plastic sealing body (4) plastic seals the mounting bracket (21) and the magnetic ring (5) together.

2. A permanent magnet rotor assembly according to claim 1, characterized in that: The clamping block (211) is in the shape of a flat block, and the cross section of the clamping slot (221) is in the shape of a flat rectangle.

3. A permanent magnet rotor assembly according to claim 1 or 2, characterized in that: First retaining hooks (26) protrude from the magnetic conductive blocks (22) on both sides of the outer opening (25) of the radial groove (23), and second retaining hooks (28) protrude from the magnetic conductive blocks (22) on both sides of the inner opening (27) of the radial groove (23), and the permanent magnet (1) is clamped between the first retaining hooks (26) and the second retaining hooks (28).

4. A permanent magnet rotor assembly according to claim 3, characterized in that: The plastic sealing body (4) further comprises a peripheral connecting rib (44), the two ends of which are respectively connected to the upper end plate (41) and the lower end plate (42), and the peripheral connecting rib (44) is sealed at the outer opening (25).

5. A permanent magnet rotor assembly according to claim 4, characterized in that: The outer side surface (220) of the magnetic conductive block (22) is exposed from the plastic sealing body (4), and the annular end plate (210) is in contact with the end surface of the magnetic conductive block (22).

6. A motor, comprising a stator assembly, a permanent magnet rotor assembly and a motor housing, characterized in that: The permanent magnet rotor assembly is the permanent magnet rotor assembly according to any one of claims 1 to 5.

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