rotor

Abstract

A rotor includes a rotor core, a rotating shaft fixed to the center of the rotor core, a sleeve fitted around the outer periphery of the rotor core, and a balancing component located at the axial end of the rotor core. The sleeve at least partially covers the axial end face of the rotor core. The balancing component is a balancing agent. The sleeve has an extension protruding outward along the axial direction of the rotating shaft. The axial end face of the rotor core is exposed radially inward from the extension. The balancing component is attached to the junction of the extension and the rotor core. This arrangement, with the balancing agent positioned radially inward from the extension, prevents it from detaching radially from the rotor core under centrifugal force, ensuring reliable positioning of the balancing agent on the rotor core end face.

Description

[Technical Field]

[0001] This utility model relates to the field of motor technology, and in particular to a rotor. [Background Technology]

[0002] Brushless motors mainly consist of a rotor, a stator, and an electronic commutator (brushless motor controller). The electronic commutator replaces the original brushes for commutation, and has the advantages of high efficiency, long life, and easy control. It is increasingly widely used in many fields such as power tools and portable electronic devices.

[0003] The rotor of a brushless motor needs to be balanced at both ends of the axial direction. A common method is to attach balancing mud to the axial end face of the rotor core to ensure the balance of the rotor. However, after the balancing mud is attached to the end face of the rotor core, due to the centrifugal force, the balancing mud may be thrown out radially from the end face of the rotor core, which will affect the use of the brushless motor.

[0004] Therefore, it is indeed necessary to provide an improved rotor to overcome the shortcomings of the prior art. [Utility Model Content]

[0005] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a rotor that can more reliably keep the balance mud on the rotor core.

[0006] The technical solution adopted by this utility model to solve the problem of the prior art is as follows: a rotor, including a rotor core, a rotating shaft fixed at the center of the rotor core, a sleeve sleeved on the outer periphery of the rotor core, and a balancing component located at the axial end of the rotor core, wherein the sleeve at least partially covers the axial end face of the rotor core; the balancing component is a balancing mud, the sleeve has an extension protruding outward along the axial direction of the rotating shaft, the axial end face of the rotor core is exposed on the radially inner side of the extension, and the balancing component is attached to the junction of the extension and the rotor core.

[0007] A further improvement is as follows: the rotor also includes permanent magnets attached to the circumferential surface of the rotor core, and the permanent magnets are evenly distributed circumferentially on the outer circumferential surface of the rotor core.

[0008] A further improvement is as follows: the sleeve further includes an end portion that at least partially covers the axial end face of the rotor core and an annular portion that protrudes axially from the end portion, the annular portion and the extension portion being located on opposite axial sides of the end portion; the annular portion is installed to the circumferential outer side of the permanent magnet and axially covers the outer periphery of the rotor core, and the extension portion is connected to the radial inner end of the end portion.

[0009] A further improvement is that the inner diameter of the end is not greater than the outer diameter of the rotor core, and the permanent magnet is housed inside the sleeve.

[0010] A further improvement is that the axial dimension of the extension is in the range of 0.3mm to 3mm.

[0011] A further improvement is that the angle between the extension and the end portion is in the range of 60° to 180°.

[0012] A further improvement is that the axial length of the permanent magnet is equal to the axial length of the rotor core, and the end abuts against the permanent magnet and the rotor core.

[0013] A further improvement is as follows: the sleeve is provided in pairs, the pair of sleeves are interference-fitted to the outer periphery of the permanent magnet, and the pair of sleeves fix the permanent magnet to the outer peripheral surface of the rotor core.

[0014] A further improvement is that the extension is a ring-shaped or conical structure that protrudes outward from the edge of the end.

[0015] A further improvement is that the sleeve is integrally formed from metal material.

[0016] Compared with the prior art, this utility model has the following advantages: the balancing component is a balancing mud, and the sleeve has an extension protruding outward along the axial direction of the rotating shaft. The axial end face of the rotor core is exposed on the radially inner side of the extension, and the balancing component is attached to the junction of the extension and the rotor core. This arrangement, with the balancing mud positioned radially inner of the extension, prevents it from detaching radially from the rotor core under centrifugal force, ensuring reliable positioning of the balancing mud on the end face of the rotor core. [Image Description]

[0017] The specific embodiments of this utility model will be further described in detail below with reference to the accompanying drawings:

[0018] Figure 1 This is a three-dimensional schematic diagram of the rotor of a preferred embodiment of the present invention;

[0019] Figure 2 yes Figure 1 The cross-sectional view of the rotor shown;

[0020] Figure 3 yes Figure 2 The exploded view of the rotor shown;

[0021] Figure 4 yes Figure 3 A three-dimensional schematic diagram of the rotor sleeve shown;

[0022] Figure 5 yes Figure 4 The image shows a cross-sectional view of the rotor sleeve. [Detailed Implementation]

[0023] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," and "rear" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device / component referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0024] Please see Figures 1 to 5 The image shows a rotor 100 according to this utility model. The rotor 100 is mounted to a brushless motor (not shown) and rotates through electromagnetic induction, thereby transmitting power to the output shaft (not shown) to drive the tool. The rotor 100 of this utility model is the rotor of a brushless motor, which does not require commutation through brushes. It is commutated through a controller electrically connected to the stator (not shown).

[0025] Please see Figures 1 to 3 As shown, the rotor 100 includes a rotor core 1, a rotating shaft 2 fixed to the center of the rotor core 1, a permanent magnet 4 mounted on the outer peripheral surface of the rotor core 1, a sleeve 3 sleeved on the outer periphery of the permanent magnet 4, and a balancing component 7 mounted on the axial end of the rotor core 1; a pair of sleeves 3 are provided, and the pair of sleeves 3 cover the outer periphery of the permanent magnet 4, so that the permanent magnet 4 is more reliably held on the outer periphery of the rotor core 1; the permanent magnet 4 is mounted on the outer peripheral surface of the rotor core 1, which can reduce the radial dimension of the rotor 100 while meeting the magnetic flux of the brushless motor.

[0026] Furthermore, the sleeve 3 has an end portion 10 that at least partially covers the axial end face of the rotor core, and extension portions 11 and annular portions 12 that protrude axially from the end portion 10 to both ends. The end portion 10 abuts against the axial end face of the rotor core 1. The extension portions 11 and annular portions 12 are located on the axial sides of the end portion, and the annular portions 12 are installed on the circumferential outer side of the permanent magnet 4 and axially cover the outer periphery of the permanent magnet 4. The end portion 10 has a circular annular structure, and the inner diameter of the end portion 10 is not greater than the outer diameter of the rotor core 1. That is, the end portion 10 covers the axial end face of the permanent magnet 4. The end portion 10 and the annular portions 12 of the sleeve 3 cover the permanent magnet 4 so that the permanent magnet 4 can be reliably installed on the outer periphery of the rotor core 1.

[0027] In this embodiment, the balancing component 7 is a balancing mud. The balancing mud 7 is used to adjust the imbalance during the operation of the rotor 100. The balancing mud 7 is adhered to the axial end face of the rotor core 1, and is also adhered to the junction of the extension 11 and the rotor core 1. The extension 11 extends from the end 10 in a direction away from the rotor core 1, and at least a portion of the axial end face of the rotor core 1 is exposed radially inside the extension 11. The balancing mud 7 is adhered to the axial end face of the rotor core 1, and is located radially inside the extension 11, while also being disposed close to the extension 11.

[0028] In existing designs, the rotor generates centrifugal force during operation. Under the action of centrifugal force, the balancing mud moves radially outward from the end face of the rotor core, causing it to detach from the end face of the rotor core. In this embodiment, the balancing mud 7 is located radially inside the extension 11, and the extension 11 protrudes outward. Under the action of centrifugal force, the balancing mud 7 abuts against the extension 11, preventing it from detaching from the axial end face of the rotor core 11.

[0029] Furthermore, the axial dimension of the extension 11 is 0.3mm to 3mm, the included angle between the extension 11 and the end plate 10 is 60° to 180°, the end plate 10, the extension 11 and the annular part 12 are integrally formed of metal material, and the shape of the extension 11 is a ring structure or a conical structure.

[0030] The rotor 100 also includes a fan 5 fixed to the shaft 2 and an insulating component 6 located between the shaft 2 and the rotor core. The fan 5 is used to guide external air into the brushless motor to cool the brushless motor. The insulating component 6 is injection molded to achieve mutual insulation between the shaft 2 and the rotor core 1.

[0031] This utility model is not limited to the specific embodiments described above. Those skilled in the art will readily understand that many alternative solutions exist for the rotor of this utility model without departing from its principles and scope. The scope of protection of this utility model is defined by the claims.

Claims

1. A rotor comprising a rotor core, a rotor shaft held in the center of the rotor core, a sleeve that is fitted to the outer periphery of the rotor core and at least partially covers the axial end surface of the rotor core, and a balance member located at the axial end portion of the rotor core, characterized in that: The balancing component is a balancing mud. The sleeve has an end that at least partially covers the axial end face of the rotor core and an extension and annular portion that protrude from the end along the axial direction of the shaft to both ends. The axial end face of the rotor core is exposed on the radially inner side of the extension. The balancing component is attached to the junction of the extension and the rotor core.

2. The rotor of claim 1, wherein: The rotor also includes permanent magnets mounted on the circumferential surface of the rotor core, the permanent magnets being evenly distributed circumferentially on the outer circumferential surface of the rotor core.

3. The rotor according to claim 2, characterized in that: The annular portion is installed on the circumferential outer side of the permanent magnet and covers the outer periphery of the permanent magnet along the axial direction, and the extension portion is connected to the radial inner end of the end portion.

4. The rotor of claim 3, wherein: The inner diameter of the end is not greater than the outer diameter of the rotor core, and the permanent magnet is housed inside the sleeve.

5. The rotor of claim 3, wherein: The axial dimension of the extension ranges from 0.3 mm to 3 mm.

6. The rotor of claim 3, wherein: The angle between the extension and the end portion is in the range of 60° to 180°.

7. The rotor of claim 3, wherein: The axial length of the permanent magnet is equal to the axial length of the rotor core, and the end abuts against the permanent magnet and the rotor core.

8. The rotor according to claim 2, characterized in that: The sleeve is provided in pairs, and the pair of sleeves are interference-fitted to the outer periphery of the permanent magnet, and the pair of sleeves fix the permanent magnet to the outer peripheral surface of the rotor core.

9. The rotor of claim 3, wherein: The extension is a ring-shaped or conical structure that protrudes outward from the edge of the end.

10. The rotor of claim 1, wherein: The sleeve is integrally formed from metal material.

Images