Mute brushless motor structure

Abstract

The utility model discloses a mute brushless motor structure, comprising a rotor assembly and a motor stator sleeved on the outer side of the rotor assembly, a plurality of tooth crowns extending inwards along the inner circumference of the motor stator, the tooth crowns dividing the inner circumference of the motor stator into a plurality of tooth grooves, the rotor assembly comprises an integrally-formed rotor iron core, a plurality of magnet groove sets are formed in the rotor iron core, each magnet groove set comprises a first magnet groove and a second magnet groove, the sides, close to the circle center of the rotor iron core, of the first magnet grooves and the second magnet grooves are close to each other, and the other sides of the first magnet grooves and the second magnet grooves are in a horn shape. And auxiliary grooves are formed in the circumferential surface of the rotor iron core between the first magnet grooves and the second magnet grooves. The magnetic field fluctuation is reduced, motor vibration and noise caused by magnetic field force change are reduced, in addition, the auxiliary grooves are formed in the circumferential surface of the rotor iron core between the first magnet grooves and the second magnet grooves, and the magnetic field distribution in the air gap can be changed.

Description

Technical Field

[0001] This utility model relates to the field of brushless motors, and more specifically to a silent brushless motor structure. Background Technology

[0002] An internal rotor brushless motor is a common type of motor in which the rotor is located inside the motor. The rotor is typically a cylindrical structure containing permanent magnets, while the stator is located outside the rotor. The stator consists of multiple windings, usually coils made of copper wire. When current flows through the stator windings, a rotating magnetic field is generated. This rotating magnetic field interacts with the permanent magnet field of the rotor, causing the rotor to rotate.

[0003] Existing small and medium-sized internal rotor brushless motors have relatively high noise levels during operation. The reason for this is that the air gap magnetic field distribution is uneven or unstable, which causes large changes in the magnetic force between the stator and rotor, resulting in electromagnetic vibration and noise. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides a silent brushless motor structure, including a rotor assembly and a motor stator sleeved on the outside of the rotor assembly. A plurality of tooth crowns extend inward along the inner circumference of the motor stator, dividing the inner circumference of the motor stator into a plurality of tooth grooves. The rotor assembly includes an integrally formed rotor core. A plurality of magnet slot groups are arranged within the rotor core, extending from the circumference of the rotor core towards the center. Each magnet slot group includes a first magnet slot and a second magnet slot. The first and second magnet slots are close to each other on their sides near the center of the rotor core, while their other sides are flared. An auxiliary slot is provided on the circumferential surface of the rotor core between the first and second magnet slots.

[0005] Furthermore, the number of crowns and grooves is 12, and the number of magnet slots is 10.

[0006] Furthermore, the number of auxiliary slots is two, and the angle between the center of the bottom of the auxiliary slot and the center of the rotor core is between 12 and 13 degrees.

[0007] Furthermore, the auxiliary groove is arc-shaped, and the arc is between 41 and 42 degrees.

[0008] Furthermore, a stator tooth pole is provided at the end of the tooth groove, and the deflection angle of the adjacent stator tooth pole is 160 degrees.

[0009] Furthermore, a circular groove is provided at the center of the rotor core, and the diameter of the rotor core is 74 mm.

[0010] Furthermore, the inner diameter of the inner circle formed by the tooth slots of the motor stator is 75 mm.

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] 1. The permanent magnets of this application are housed within a magnet slot assembly, with the first and second magnet slots close to each other on one side near the rotor core's center, and the other side flared outwards. This means the permanent magnets are radially distributed around the rotor core, resulting in a more uniform magnetic field distribution around the rotor core. When the motor is running, the rotating magnetic field generated by the stator interacts with the rotor's permanent magnet magnetic field. The uniform magnetic field smooths this interaction, reducing excessive local magnetic force variations caused by magnetic field inhomogeneity. This reduction in magnetic field fluctuations lowers motor vibration and noise caused by changes in magnetic force.

[0013] 2. Furthermore, auxiliary slots are provided on the circumferential surface of the rotor core between the first and second magnet slots, which can also alter the magnetic field distribution in the air gap. The original air gap magnetic field may be uneven, but the slots can adjust the magnetic field distribution, making it more uniform. A uniform magnetic field allows for a smoother interaction between the rotating magnetic field generated by the stator windings and the rotor magnetic field, reducing excessive local magnetic force variations caused by magnetic field unevenness. This reduces vibration and noise caused by changes in magnetic field force during motor operation, improving noise reduction.

[0014] Additional aspects and advantages of this invention will be set forth in the description which follows, and some will be obvious from the description or may be learned by practice of the invention. Attached Figure Description

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the structure of the electronic stator of this utility model;

[0018] Figure 3 This is an enlarged view of part C in the structural schematic diagram of the electronic stator of the utility model;

[0019] Figure 4 This is a schematic diagram of the rotor assembly of the utility model.

[0020] The reference numerals and names in the figure are as follows:

[0021] Rotor assembly 100, motor stator 200, tooth crown 210, rotor core 110, tooth slot 220, tooth pole 230, magnet slot group 120, first magnet slot 121, second magnet slot 122, auxiliary slot 130, and circular slot 140. Detailed Implementation

[0022] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] The present invention will now be described in more detail. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them.

[0024] In the description of this utility model, it should be noted that directional terms such as "front, back, up, down, left, right," "horizontal, vertical, horizontal," and "top, bottom," indicating directions or positional relationships, are generally based on the directions or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or 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 scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself. In the description of this utility model, it should be noted that the use of terms such as "first" and "second" to define components is merely for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0025] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention.

[0026] Furthermore, the technical features involved in the different embodiments of this application described below can be combined with each other as long as they do not conflict with each other.

[0027] The preferred embodiments of this utility model will now be further described with reference to the accompanying drawings. Figures 1 to 4 As shown, a silent brushless motor structure includes a rotor assembly 100 and a motor stator 200 sleeved on the outside of the rotor assembly 100. A plurality of tooth crowns 210 extend inward along the inner circumference of the motor stator 200. The tooth slots 220 are used for winding coils (not shown in the figure). The tooth crowns 210 divide the inner circumference of the motor stator 200 into a plurality of tooth slots 220. Stator tooth poles 230 are provided at the ends of the tooth slots 220. The rotor assembly 100 includes an integrally formed rotor core 110. The rotor core 110 is provided with a plurality of magnet slot groups 120 arranged from the circumference of the rotor core 110 toward the center. The magnet slot groups 120 are used to accommodate permanent magnets. The magnet slot groups 120 include a first magnet slot 121 and a second magnet slot 122. The first magnet slot 121 and the second magnet slot 122 are close to each other on the side near the center of the rotor core 110, and the other side is flared. An auxiliary slot 130 is provided on the circumferential surface of the rotor core 110 between the first magnet slot 121 and the second magnet slot 122.

[0028] In this embodiment, permanent magnets are first embedded in the first magnet slot 121 and the second magnet slot 122. Then, the coil is energized, causing the rotor core 110 to rotate under the influence of the permanent magnet's magnetic field. Compared to the prior art, the permanent magnets in this application are housed within the magnet slot group 120, and the first magnet slot 121 and the second magnet slot 122 are close to each other on one side near the center of the rotor core 110, while the other side is flared. That is, the permanent magnets are radially distributed around the rotor core 110, which makes the magnetic field distribution around the rotor core 110 more uniform. When the motor is running, the rotating magnetic field generated by the stator interacts with the magnetic field of the rotor permanent magnet. The uniform magnetic field makes this interaction more stable, reducing the situation of excessive local magnetic force changes caused by uneven magnetic field. The reduction in magnetic field fluctuations lowers motor vibration and noise caused by changes in magnetic field force. Furthermore, auxiliary slots 130 are provided on the circumferential surface of the rotor core 110 between the first magnet slot 121 and the second magnet slot 122. Therefore, the air gap between the rotor assembly 100 and the motor stator 200 is non-uniform, and the distance between them changes with the rotation of the rotor assembly, resulting in a continuous change in the density of magnetic lines of force and thus altering the magnetic field distribution in the air gap. The original air gap magnetic field may have been non-uniform, but the grooves can adjust the magnetic field distribution, making it more uniform. A uniform magnetic field allows for a smoother interaction between the rotating magnetic field generated by the stator windings and the rotor magnetic field, reducing excessive local magnetic force changes caused by magnetic field non-uniformity. This reduces vibration and noise caused by changes in magnetic field force during motor operation, improving noise reduction.

[0029] Furthermore, based on the above embodiments, such as Figure 2 As shown, the number of tooth crowns 210 and tooth grooves 220 is 12, and the number of magnet slot groups 120 is 10, so that the common multiple of the tooth grooves 220 and the number of poles is reduced, thereby effectively increasing the tooth groove torque of the motor.

[0030] Furthermore, based on the above embodiments, such as Figure 4 As shown, there are two auxiliary slots 130. The angle between the center of the bottom of the auxiliary slot 130 and the center of the rotor core 110 is between 12 and 13 degrees. Within this range, the auxiliary slot 130 has the best effect on adjusting the magnetic field and can make the magnetic field distribution more uniform.

[0031] Furthermore, based on the above embodiments, such as Figure 4As shown, the auxiliary groove 130 is arc-shaped, with an arc angle B between 41 and 42 degrees. The rotation of the rotor core 110 causes the surrounding air to flow. The arc of the auxiliary groove 130 guides the airflow, allowing it to flow more smoothly in the gap between the rotor core 110 and the motor stator 200. The arc angle between 41 and 42 degrees reduces airflow turbulence and vortices. This allows the auxiliary groove 130 to act like a small guide channel, allowing air to flow in a certain direction, thereby reducing wind noise caused by air friction and airflow disturbance.

[0032] Furthermore, based on the above embodiments, such as Figure 3 As shown, the deflection angle of adjacent stator teeth 230 is 160 degrees. The deflection angle here refers to the angle A formed between the outer sides of adjacent stator teeth 230. At this angle, the magnetic field distribution in the air gap can be changed, thereby adjusting the magnetic field distribution and making it more uniform.

[0033] Furthermore, based on the above embodiments, such as Figure 4 As shown, a circular groove 140 is provided at the center of the rotor core 110, and the drive shaft (not shown in the figure) is installed in the circular groove 140. The diameter of the rotor core 110 is 74 mm.

[0034] Furthermore, based on the above embodiment, the inner diameter of the inner circle formed by the tooth grooves 220 of the motor stator 200 is 75 mm.

[0035] Furthermore, based on the above embodiments, the distance between adjacent stator tooth poles 230 is 8 to 9 millimeters.

[0036] The details of the above exemplary embodiments are provided, and the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be regarded as exemplary and non-limiting in all respects, and the scope of the present invention is defined by the appended claims rather than the foregoing description. Therefore, it is intended that all changes falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A silent brushless motor structure, characterized in that, The device includes a rotor assembly (100) and a motor stator (200) sleeved on the outside of the rotor assembly (100). A plurality of tooth crowns (210) extend inward along the inner circumference of the motor stator (200), dividing the inner circumference of the motor stator (200) into a plurality of tooth grooves (220). The rotor assembly (100) includes an integrally formed rotor core (110), and a toothed groove is provided within the rotor core (110) extending from the rotor core (100). 110) A plurality of magnet slot groups (120) are arranged circumferentially towards the center. The magnet slot group (120) includes a first magnet slot (121) and a second magnet slot (122). The first magnet slot (121) and the second magnet slot (122) are close to each other on one side near the center of the rotor core (110), and the other side is flared. An auxiliary slot (130) is provided on the circumferential surface of the rotor core (110) between the first magnet slot (121) and the second magnet slot (122).

2. The silent brushless motor structure according to claim 1, characterized in that, The number of crowns (210) and grooves (220) is 12, and the number of magnet slot groups (120) is 10.

3. The silent brushless motor structure according to claim 2, characterized in that, The number of auxiliary slots (130) is two, and the center angle between the bottom center of the auxiliary slot (130) and the rotor core (110) is between 12 and 13 degrees.

4. The silent brushless motor structure according to claim 3, characterized in that, The auxiliary groove (130) is arc-shaped, with an arc degree between 41 and 42 degrees.

5. The silent brushless motor structure according to claim 4, characterized in that, A stator tooth pole (230) is provided at the end of the tooth groove (220), and the deflection angle of the adjacent stator tooth pole (230) is 160 degrees.

6. The silent brushless motor structure according to claim 5, characterized in that, A circular groove (140) is provided at the center of the rotor core (110), and the diameter of the rotor core (110) is 74 mm.

7. The silent brushless motor structure according to claim 6, characterized in that, The inner diameter of the inner circle formed by the tooth grooves (220) of the motor stator (200) is 75 mm.

8. The silent brushless motor structure according to claim 5, characterized in that, The distance between adjacent stator teeth (230) is between 8 and 9 millimeters.

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