Rotor assembly and motor

Abstract

The utility model discloses a rotor assembly and a motor, the rotor assembly comprises a rotor iron core, a plurality of permanent magnets and a plastic package member, the rotor iron core comprises a plurality of sub-iron cores, the plurality of sub-iron cores are arranged in a radial pattern, and a magnet groove is formed between any two adjacent sub-iron cores; the plurality of permanent magnets are respectively arranged in the plurality of magnet grooves; the plastic package part is integrally formed through injection molding and used for connecting the multiple sub-iron cores and the multiple permanent magnets. According to the technical scheme of the utility model, the rotor iron core is divided into a plurality of sub-iron cores, so that the magnetic leakage phenomenon of an internal magnetic isolation bridge is avoided, and the through grooves are arranged at the positions of the sub-iron cores close to the permanent magnets, so that the plastic package parts are injected into the through grooves during injection molding, and the structure of the rotor assembly is more stable; therefore, the plurality of sub-iron cores and the plurality of permanent magnets are prevented from radial disengagement caused by centrifugal force generated by rotation of the rotor, and the operation reliability of the motor is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a rotor assembly and a motor. Background Art

[0002] The rotors in current motors mostly adopt an integrated structure, which has an internal magnetic isolation bridge, so that part of the magnetic circuit will leak through the internal magnetic isolation bridge, affecting the performance of the motor. The split rotor structure can solve the above problem, but the split rotor structure is weak in strength, which reduces the reliability of the motor operation. Utility Model Content

[0003] The main purpose of the utility model is to provide a rotor assembly, aiming to improve the structural strength of a split rotor structure.

[0004] To achieve the above-mentioned purpose, the rotor assembly proposed by the utility model comprises:

[0005] The rotor core comprises a plurality of sub-cores, wherein the sub-cores are arranged radially, and a magnet slot is formed between any two adjacent sub-cores;

[0006] A plurality of permanent magnets, wherein the plurality of permanent magnets are respectively disposed in the plurality of magnet slots;

[0007] A plastic package, which is integrally formed by injection molding and is used to connect the plurality of sub-iron cores and the plurality of permanent magnets;

[0008] Among them, a plurality of the sub-cores are provided with through slots at positions close to the permanent magnets, and the through slots are used to allow the plastic package to be injected during injection molding.

[0009] In one embodiment, the through slots are disposed on two opposite sides of the sub-core.

[0010] In one embodiment, the through slot has an opening facing the permanent magnet and a slot bottom opposite to the opening, and a distance from the opening to the slot bottom is D, and D satisfies 0.5 mm≤D≤2 mm.

[0011] In one embodiment, the plastic package is hollowed out to form a shaft mounting position, the sub-core includes a plurality of rotor punchings, at least one of the plurality of rotor punchings is provided with a limiting structure toward the shaft mounting position, and the limiting structure abuts against the permanent magnet.

[0012] In one embodiment, an injection molding groove is provided on a side of the limiting structure close to the permanent magnet, and the injection molding groove is used to allow the plastic package to flow in during injection molding.

[0013] In one embodiment, the limiting structures are arranged at intervals in the axial direction of the sub-core.

[0014] In one embodiment, the limiting structure includes an extension portion and a support portion, the extension portion is extended from the rotor punching toward the shaft mounting position, the support portion is connected to one end of the extension portion away from the rotor punching, and the support portion is used to support the permanent magnet.

[0015] In one embodiment, the support portion is arranged in a U shape.

[0016] In one embodiment, the support portion includes a connecting segment and two supporting segments, the connecting segment is connected to the extension portion, the two supporting segments are respectively connected to opposite ends of the connecting segment, and an angle α is formed between the supporting segment and the extension portion, and α satisfies 10°≤α≤80°.

[0017] In one embodiment, the number of the sub-cores is set to N, where N=14.

[0018] The utility model also proposes a motor, which includes a rotor assembly, which includes a rotor core, a plurality of permanent magnets and a plastic sealing member, wherein the rotor core includes a plurality of sub-cores, the plurality of sub-cores are arranged radially, and a magnet slot is formed between any two adjacent sub-cores; the plurality of permanent magnets are respectively arranged in the plurality of magnet slots; the plastic sealing member is integrally formed by injection molding to connect the plurality of sub-cores and the plurality of permanent magnets; wherein the plurality of sub-cores are provided with through slots near the permanent magnets, and the through slots are used to allow the plastic sealing member to be injected during injection molding.

[0019] The technical solution of the utility model adopts the method of dividing the rotor core into multiple sub-cores to avoid magnetic flux leakage through the internal magnetic isolation bridge, and provides through grooves at the positions of the sub-cores close to the permanent magnets, so that the plastic sealing parts can be injected into the through grooves during injection molding, so that the structure of the rotor assembly is more stable, and the multiple sub-cores and multiple permanent magnets will not be radially dislodged due to the centrifugal force generated by the rotation of the rotor, thereby ensuring the operating reliability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0021] Figure 1 is a schematic diagram of the structure of the rotor assembly;

[0022] Figure 2 This is a schematic diagram of the structure of the rotor assembly after removing the plastic sealing parts;

[0023] Figure 3 It is a structural schematic diagram of the sub-core;

[0024] Figure 4 A schematic diagram of a structure in which a plurality of rotor punchings are stacked to form a rotor core;

[0025] Figure 5 It is a schematic diagram of the structure of a rotor punching with a limiting structure.

[0026] Description of Figure Numbers:

[0027] Label name Label name 10 Rotor core 132 Extension 100 Sub-core 133 Support 110 Through slot 133a Connection segment 111 Opening 133b Support segment 112 Bottom of the tank 140 Limiting part 120 Rotor punching 20 permanent magnet 130 Limiting structure 30 Plastic parts 131 Injection molding slot 310 Shaft installation position

[0028] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0031] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0032] The rotors in current motors mostly adopt an integrated structure, which has an internal magnetic isolation bridge, so that part of the magnetic circuit will leak through the internal magnetic isolation bridge, affecting the performance of the motor. The split rotor structure can solve the above problem, but the split rotor structure is weak in strength, which reduces the reliability of the motor operation.

[0033] In view of this, the utility model provides a rotor assembly, which is used for a motor.

[0034] In the embodiment of the present utility model, Figures 1 to 3 As shown, the rotor assembly includes a rotor core 10, a plurality of permanent magnets 20 and a plastic sealing member 30, wherein the rotor core 10 includes a plurality of sub-cores 100, the plurality of sub-cores 100 are arranged radially, and a magnet slot is formed between any two adjacent sub-cores 100; the plurality of permanent magnets 20 are respectively arranged in the plurality of magnet slots; the plastic sealing member 30 is integrally formed by injection molding and is used to connect the plurality of sub-cores 100 and the plurality of permanent magnets 20; wherein the plurality of sub-cores 100 are provided with through slots 110 near the permanent magnets 20, and the through slots 110 are used to allow the plastic sealing member 30 to be injected during injection molding.

[0035] The rotor assembly of the utility model is used in a motor, wherein the rotor core 10 includes a plurality of sub-cores 100, and the plurality of sub-cores 100 are separately arranged. Therefore, the rotor assembly in this embodiment can avoid an internal magnetic isolation bridge, thereby preventing the magnetic circuit from leaking through the internal magnetic isolation bridge, thereby ensuring the performance of the motor.

[0036] Specifically, the plastic package 30 is hollow and has a shaft mounting position 310, and the shaft (not shown) is installed inside the plastic package 30. The specific installation method is to form the plastic package 30 in one piece during injection molding, and the shaft is used to drive other components to move. Among them, multiple sub-cores 100 are arranged radially, that is, multiple sub-cores 100 are distributed along the circumference of the shaft mounting position 310. It should be noted that a magnet slot is formed between any two adjacent sub-cores 100, and multiple permanent magnets 20 are respectively arranged in the multiple magnet slots, that is, multiple permanent magnets 20 and multiple magnet slots are arranged one by one. It has been explained above that the sub-cores 100 are arranged radially, and the magnet slots and permanent magnets 20 are arranged between any adjacent sub-cores 100, so the magnet slots and permanent magnets 20 are also arranged radially. Multiple permanent magnets 20 and the rotor core 10 are fixed together during injection molding of the plastic package 30, so that the fixing effect of the rotor assembly is better. The permanent magnet 20 is used to form magnetic flux lines. When the motor is running, the rotor rotates relative to the stator (not shown) in the motor, and the winding in the stator cuts the magnetic inductance so that the motor can run normally.

[0037] It should be noted that, considering that the multiple sub-cores 100 are separately arranged, the structural stability of the rotor assembly formed by the integrated rotor core 10 is poor, so a through slot 110 is opened at the position of the sub-core 100 close to the permanent magnet 20, and the through slot 110 is used to allow the plastic package 30 to flow into the through slot 110 during injection molding (in liquid state), so that the overall structure of the rotor assembly is more stable. And the through slot 110 is opened at a position close to the permanent magnet 20, considering that the permanent magnet 20 is arranged on both sides of each sub-core 100, so the through slot 110 can be opened only on one side of the sub-core 100, or the through slot 110 can be opened on both sides of the sub-core 100, which is not specifically limited here.

[0038] The technical solution of the utility model adopts the method of dividing the rotor core 10 into multiple sub-cores 100 to avoid magnetic leakage through the internal magnetic isolation bridge, and opening a through groove 110 at the position of the sub-core 100 close to the permanent magnet 20, so that the plastic package 30 is injected into the through groove 110 during injection molding, so that the structure of the rotor assembly is more stable, and the multiple sub-cores 100 and the multiple permanent magnets 20 will not be radially disengaged due to the centrifugal force generated by the rotation of the rotor, thereby ensuring the operating reliability of the motor.

[0039] For further information, see Figure 2 The through slots 110 are opened on two opposite sides of the sub-core 100 .

[0040] According to the previous embodiment, a through slot 110 is opened at a position of the sub-core 100 near the permanent magnet 20. In the present embodiment, it is further defined that the through slot 110 is opened on two opposite sides of the sub-core 100, and the through slots 110 on the plurality of sub-cores 100 are approximately located on the same circular edge line. By opening the through slots 110 in this way, the fixing effect of the plastic package 30 on the rotor core 10 and the plurality of permanent magnets 20 is further improved, thereby further improving the reliability of the rotor assembly structure.

[0041] In one embodiment, see Figure 5 The through slot 110 has an opening 111 facing the permanent magnet 20 and a slot bottom 112 opposite to the opening 111 , and a distance D from the opening 111 to the slot bottom 112 satisfies 0.5 mm ≤ D ≤ 2 mm.

[0042] It should be noted that the through slot 110 passes through the opposite ends of the sub-core 100, and the through slot 110 has an opening 111 facing the permanent magnet and a slot bottom 112 corresponding to the opening 111, and the slot depth of the through slot 110 is the distance between the opening 111 and the slot bottom 112. Considering that the sub-core 100 is a conical structure, the width of the sub-core 100 becomes smaller and smaller from the end away from the shaft mounting position 310 to the end close to the shaft mounting position 310. The through slot 110 is opened at the end closer to the shaft mounting position 310, so the slot depth of the through slot 110 cannot be set too deep, otherwise it will cause the structural strength of the sub-core 100 to deteriorate; it is also considered that if the slot depth of the through slot 110 is too small, the plastic package 30 cannot achieve a good effect of strengthening the overall structure, so the slot depth of the through slot 110 cannot be too small. In this way, the depth of the through slot 110 is set to be greater than or equal to 0.5 mm and the depth of the through slot 110 is less than or equal to 2 mm.

[0043] In one embodiment, see Figure 1 and Figure 2 The plastic package 30 is hollowly provided with a shaft mounting position 310 , and the sub-core 100 includes a plurality of rotor punchings 120 , at least one of the plurality of rotor punchings 120 is provided with a limiting structure 130 toward the shaft mounting position 310 , and the limiting structure 130 abuts against the permanent magnet 20 .

[0044] Specifically, the sub-core 100 includes a plurality of rotor punchings 120, the number of rotor punchings 120 in the sub-core 100 is determined according to the axial dimension of the required motor, and a plurality of rotor punchings 120 are stacked to form the sub-core 100. Among them, one of the plurality of rotor punchings 120 is provided with a limiting structure 130 toward the shaft mounting position 310, and the limiting structure 130 is used to limit one end of the permanent magnet 20 close to the shaft mounting position 310, and the limiting structure 130 abuts against the permanent magnet 20. In addition, one end of the sub-core 100 away from the shaft mounting position 310 extends toward opposite sides to form limiting portions 140, and the permanent magnet 20 can be limited between the above two by the cooperation of the limiting portion 140 and the limiting structure 130, so that the permanent magnet 20 has better stability during the rotation of the rotor and will not be thrown away by a large centrifugal force.

[0045] In one embodiment, see Figure 5 The limiting structure 130 is provided with an injection molding groove 131 on one side close to the permanent magnet 20 , and the injection molding groove 131 is used to allow the plastic package 30 to flow in during injection molding.

[0046] It should be noted that an injection molding groove 131 is provided on one side of the limiting structure 130 close to the permanent magnet 20. When the plastic package 30 is injection molded, part of the plastic package 30 is injected into the injection molding groove 131, so that the overall structure of the rotor assembly is more stable, so that the multiple sub-cores 100 and the multiple permanent magnets 20 will not be radially disengaged due to the centrifugal force generated by the rotation of the rotor, thereby ensuring the operating reliability of the motor.

[0047] Preferably, see Figure 3 and Figure 4 The limiting structures 130 are arranged at intervals in the axial direction of the sub-core 100.

[0048] It should be noted that, according to the above-mentioned embodiment, at least one of the plurality of rotor punchings 120 is provided with a limiting structure 130. In this embodiment, a plurality of the plurality of rotor punchings 120 are provided with limiting structures 130, and the plurality of rotor punchings 120 provided with limiting structures 130 are arranged at intervals. More specifically, in this embodiment, a plurality of rotor punchings 120 on opposite sides of the sub-core 100 or close to opposite sides of the sub-core 100 are provided with limiting structures 130, and a plurality of rotor punchings 120 in the middle of the sub-core 100 are provided with limiting structures 130.

[0049] In one embodiment, see Figure 3 The limiting structure 130 includes an extension portion 132 and a support portion 133. The extension portion 132 extends from the rotor punching 120 toward the shaft mounting position 310. The support portion 133 is connected to one end of the extension portion 132 away from the rotor punching 120. The support portion 133 is used to support the permanent magnet 20.

[0050] Specifically, the limiting structure 130 is integrally formed with the rotor punching 120 , and the limiting structure 130 includes an extension portion 132 and a support portion 133 . The extension portion 132 is used to make the support portion 133 have a certain distance from the rotor punching 120 so that the support portion 133 forms a better force angle and abuts against the permanent magnet 20 .

[0051] In one embodiment, see Figures 3 to 5 , the support portion 133 is arranged in a U shape.

[0052] It should be noted that the support portion 133 is U-shaped, so that the support portion 133 can respectively abut against the permanent magnets 20 on opposite sides of the sub-core 100 , so that the permanent magnets 20 on opposite sides of any sub-core 100 are supported by the support portion 133 .

[0053] For further information, see Figure 3The support portion 133 includes a connecting segment 133a and two supporting segments 133b, the connecting segment 133a is connected to the extending portion 132, and the two supporting segments 133b are respectively connected to the opposite ends of the connecting segment 133a, and an angle α is formed between the supporting segment 133b and the extending portion 132, and the angle α satisfies 10°≤α≤80°.

[0054] More specifically, the support portion 133 includes a connecting section 133a and two supporting sections 133b, the two supporting sections 133b are respectively connected to opposite ends of the connecting section 133a, the extension section is connected to the middle of the connecting section, and the two supporting sections 133b are respectively used to abut against the permanent magnets 20 on opposite sides of the sub-core 100. The supporting section 133b and the extension section 132 form an angle, and considering that the supporting section 133b should have a good supporting and limiting effect on the permanent magnet 20, the angle should be greater than or equal to 10°, and the angle should be less than or equal to 80°, within which range the support portion 133 has a good limiting effect.

[0055] In one embodiment, see Figure 2 , the number of the sub-cores 100 is set to N, and N=14.

[0056] It should be noted that, in order to make the rotor core 10 have stronger magnetism, the number of sub-cores 100 is set to 14 in this embodiment. Compared with the motors on the market, the rotor core 10 in this embodiment has more sub-cores 100. And considering that, when the overall volume of the rotor assembly remains unchanged, increasing the number of sub-cores 100 will reduce the volume of a single sub-core 100, the utility model opens the through slots 110 on opposite sides of the sub-core 100 instead of in the middle of the sub-core 100.

[0057] The utility model also proposes a motor, which includes a rotor assembly. The specific structure of the rotor assembly refers to the above-mentioned embodiment. Since the motor adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0058] The above description is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A rotor assembly, characterized in that: include: The rotor core comprises a plurality of sub-cores, wherein the sub-cores are arranged radially, and a magnet slot is formed between any two adjacent sub-cores; A plurality of permanent magnets, wherein the plurality of permanent magnets are respectively disposed in the plurality of magnet slots; A plastic package, which is integrally formed by injection molding and is used to connect the plurality of sub-iron cores and the plurality of permanent magnets; Among them, a plurality of the sub-cores are provided with through slots at positions close to the permanent magnets, and the through slots are used to allow the plastic package to be injected during injection molding.

2. The rotor assembly according to claim 1, characterized in that The through slots are arranged on two opposite sides of the sub-iron core.

3. The rotor assembly according to claim 2, characterized in that The through slot has an opening facing the permanent magnet and a slot bottom opposite to the opening, a distance from the opening to the slot bottom is D, and D satisfies 0.5 mm≤D≤2 mm.

4. The rotor assembly according to claim 1, wherein: The plastic package is hollowed out to form a shaft installation position, the sub-core includes a plurality of rotor punchings, at least one of the plurality of rotor punchings is provided with a limiting structure toward the shaft installation position, and the limiting structure abuts against the permanent magnet.

5. The rotor assembly according to claim 4, characterized in that An injection molding groove is arranged on one side of the limiting structure close to the permanent magnet, and the injection molding groove is used for the plastic package to flow in during injection molding.

6. The rotor assembly according to claim 4, characterized in that The limiting structures are arranged at intervals in the axial direction of the sub-core.

7. The rotor assembly according to claim 4, characterized in that: The limiting structure includes an extension portion and a support portion, wherein the extension portion is extended from the rotor punching sheet toward the shaft mounting position, and the support portion is connected to an end of the extension portion away from the rotor punching sheet, and the support portion is used to support the permanent magnet.

8. The rotor assembly according to claim 7, characterized in that The supporting portion is arranged in a U shape.

9. The rotor assembly according to claim 8, characterized in that The support portion includes a connecting section and two supporting sections, the connecting section is connected to the extending section, the two supporting sections are respectively connected to opposite ends of the connecting section, an angle α is formed between the supporting section and the extending section, and α satisfies 10°≤α≤80°.

10. The rotor assembly according to claim 1, wherein: The number of the sub-cores is set to N, where N=14.

11. A motor, characterized in that: Comprising a rotor assembly as claimed in any one of claims 1 to 10.

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