Permanent magnet rotor potting design

Abstract

The invention discloses a permanent magnet rotor potting design which comprises a shaft, a rotor iron core, a permanent magnet and a potting material. The shaft is sleeved with a rotor core, a plurality of permanent magnets are attached to the outer wall of the rotor core, the circle center of an outer arc section of each permanent magnet and the circle center of an inner arc section of each permanent magnet are not located on the same point, and the central angle corresponding to the outer arc section is smaller than the central angle corresponding to the inner arc section. Meanwhile, the rotor iron core and the permanent magnets are packaged through a potting material. The chemical activity of the potting material is low, and the potting material does not react with the magnetic steel adhesive. The device can prevent the permanent magnet of the motor from falling off, protect the surface of the permanent magnet rotor and increase the strength, on the basis, the space of the motor is fully utilized, the space utilization rate is improved, meanwhile, the air gap flux density is improved, and the performance of the motor is further improved.

Description

Technical Field

[0001] The invention relates to the technical field of brushless motors, in particular to a permanent magnet rotor potting design. Background Art

[0002] For existing brushless motors, most high-speed permanent magnet rotors are protected by carbon fiber sleeves, on the one hand to protect the performance of the permanent magnets, and on the other hand to prevent the centrifugal force generated by excessive speed from being too large, causing the bonding to fail and the permanent magnets to fly away. However, the thinnest size of the carbon fiber sleeve can only be between 0.3-0.5mm, which means that the motor air gap must have enough space to install the sleeve, and the air gap magnetic density is greatly reduced.

[0003] On the other hand, with the development of weapons and equipment, the requirements for miniaturization and improved performance parameters of motors used in weapons and equipment are getting higher and higher. As an indispensable and widely used actuator in weapons and equipment, the motor structure should be carefully designed during design to make full use of the motor space without affecting the performance parameters of the motor. Summary of the invention

[0004] The object of the present invention is to provide a permanent magnet rotor potting design, comprising a shaft, a rotor core, a permanent magnet and a potting material.

[0005] The shaft outer sleeve is provided with a rotor core.

[0006] A plurality of permanent magnets are attached to the outer wall of the rotor core.

[0007] The permanent magnet and the rotor core are packaged by potting material.

[0008] Furthermore, the pole arc coefficient of the permanent magnet is less than 1.

[0009] Furthermore, the center of the outer arc segment of the permanent magnet is offset relative to the center of the inner arc segment, that is, the center of the outer arc segment of the permanent magnet is not at the same point as the center of the inner arc segment, and the center angle corresponding to the outer arc segment is smaller than the center angle corresponding to the inner arc.

[0010] Furthermore, the offset size of the center of the outer arc segment of the permanent magnet is greater than 0 and smaller than the radius corresponding to the inner arc.

[0011] Furthermore, the curing temperature of the potting material is lower than the demagnetization temperature of the permanent magnet.

[0012] Furthermore, the potting material is made of F-5241X4 heat-resistant packaging material.

[0013] Furthermore, the shaft is connected to the rotor core via a key.

[0014] The technical effect of the present invention is undoubted, and the beneficial effects of the present invention are as follows:

[0015] The device of the present invention can prevent the permanent magnets of the motor from falling off, protect the surface of the permanent magnet rotor, and increase the strength. On this basis, it also fully utilizes the motor space and improves the space utilization rate. At the same time, it also increases the air gap magnetic density and further improves the motor performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of permanent magnet rotor potting;

[0017] In the figure: 1-shaft; 2-rotor core; 3-key; 4-permanent magnet; 5-potting material. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the embodiments, but it should not be understood that the above subject matter of the present invention is limited to the following embodiments. Without departing from the above technical ideas of the present invention, various substitutions and changes are made according to the common technical knowledge and customary means in the art, which should all be included in the protection scope of the present invention.

[0019] Embodiment 1:

[0020] A permanent magnet rotor potting design includes a shaft 1, a rotor core 2, a permanent magnet 4 and a potting material 5.

[0021] The shaft 1 is provided with a rotor core 2 on its outer sleeve.

[0022] A plurality of permanent magnets 4 are attached to the outer wall of the rotor core 2 by means of magnetic steel adhesive.

[0023] The permanent magnet 4 and the rotor core 2 are packaged by a potting material 5 .

[0024] The potting material 5 has low chemical activity and will not react with the magnetic steel adhesive.

[0025] Embodiment 2:

[0026] The main structure of this embodiment is the same as that of Embodiment 1. Furthermore, the pole arc coefficient of the permanent magnet 4 is less than 1.

[0027] Embodiment 3:

[0028] The main structure of this embodiment is the same as any one of Embodiments 1 to 2. Furthermore, the center of the outer arc segment of the permanent magnet 4 is offset relative to the center of the inner arc segment, that is, the center of the outer arc segment of the permanent magnet 4 is not at the same point as the center of the inner arc segment, and the center angle corresponding to the outer arc segment is smaller than the center angle corresponding to the inner arc, so as to expose sufficient space for attaching the potting material.

[0029] Embodiment 4:

[0030] The main structure of this embodiment is the same as that of Embodiment 3. Furthermore, the offset size of the center of the outer arc segment of the permanent magnet 4 is greater than 0 and smaller than the radius corresponding to the inner arc. The specific offset range needs to be determined by the designer based on specific performance.

[0031] Embodiment 5:

[0032] The main structure of this embodiment is the same as any one of Embodiments 1 to 4. Furthermore, the curing temperature of the potting material 5 is lower than the demagnetization temperature of the permanent magnet 4 .

[0033] Embodiment 6:

[0034] The main structure of this embodiment is the same as any one of Embodiments 1 to 5. Furthermore, the potting material 5 is made of F-5241X4 heat-resistant packaging material.

[0035] Embodiment 7:

[0036] The main structure of this embodiment is the same as any one of Embodiments 1 to 6. Furthermore, the shaft 1 is connected to the rotor core 2 via a key 3.

[0037] Embodiment 8:

[0038] The main structure of this embodiment is the same as any one of Embodiments 1 to 7. Furthermore, when designing the motor, the permanent magnet pole arc coefficient is less than 1, and the center of the outer circle of the permanent magnet is offset to a certain extent according to the motor performance. After the permanent magnet and the rotor core are assembled, a suitable potting material is selected for potting (the potting material currently selected is F-5241X4 heat-resistant packaging material).

[0039] Embodiment 9:

[0040] The main structure of this embodiment is the same as any one of Embodiments 1 to 8. Furthermore, when designing the motor, there are certain requirements for the motor pole arc coefficient and the outer circle center offset. Sufficient space needs to be reserved for attaching the potting material. The specific potting ideas are as follows. The selection of the encapsulation material is very important, and the selection of the potting material should meet the following requirements:

[0041] 1. The encapsulation material must have strong strength and certain toughness, such as F-5241X4 heat-resistant encapsulation material.

[0042] 2. The curing temperature of the packaging material is less than the demagnetization temperature of the permanent magnet.

[0043] 3. The chemical activity of the packaging material is low and will not react with the magnetic steel adhesive.

Claims

1. A permanent magnet rotor potting design, characterized by: It comprises a shaft (1), a rotor core (2), a permanent magnet (4) and a potting material (5). The shaft (1) is provided with a rotor core (2) on its outer sleeve; A plurality of permanent magnets (4) are attached to the outer wall of the rotor core (2); The permanent magnet (4) and the rotor core (2) are packaged by a potting material (5).

2. A permanent magnet rotor potting design according to claim 1, characterized in that: The pole arc coefficient of the permanent magnet (4) is less than 1.

3. A permanent magnet rotor potting design according to claim 1, characterized in that: The center of the outer arc segment of the permanent magnet (4) is offset relative to the center of the inner arc segment, that is, the center of the outer arc segment of the permanent magnet (4) is not at the same point as the center of the inner arc segment, and the center angle corresponding to the outer arc segment is smaller than the center angle corresponding to the inner arc.

4. A permanent magnet rotor potting design according to claim 3, characterized in that: The offset dimension of the center of the outer arc segment of the permanent magnet (4) is greater than 0 and smaller than the radius corresponding to the inner arc.

5. A permanent magnet rotor potting design according to claim 1, characterized in that: The curing temperature of the potting material (5) is lower than the demagnetization temperature of the permanent magnet (4).

6. A permanent magnet rotor potting design according to claim 1, characterized in that: The potting material (5) is made of F-5241X4 heat-resistant packaging material.

7. A permanent magnet rotor potting design according to claim 1, characterized in that: The shaft (1) and the rotor core (2) are connected via a key (4).

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