Brushless motor

Abstract

The brushless motor comprises a stator assembly and a motor rotor arranged in the stator assembly in a sleeved mode, the stator assembly comprises a stator ring, tooth crowns are arranged along the inner circumference of the stator ring in an inward extending mode, the motor rotor comprises a rotor core, and a plurality of first containing spaces are formed in the circumferential face of the rotor core; a first accommodating space is formed between the stator assembly and the motor rotor, a fan blade assembly is configured in the first accommodating space, a second accommodating space is formed between the stator assembly and the motor rotor, the first accommodating space is communicated with the second accommodating space, a rotating shaft is connected between the rotor core and the fan blade assembly, and the fan blade assembly is fixedly sleeved on the rotating shaft. According to the invention, the fan blade assembly is arranged in the first accommodating space, and then the rotating shaft is utilized to drive the fan blade assembly to synchronously rotate while rotating, so that the fan blade assembly generates air towards the outside of the rotor core, deposited heat in the second accommodating space can be blown away, and a good heat dissipation effect is formed.

Description

Technical Field

[0001] The present invention relates to the field of motors, and more particularly to a brushless motor. Background Art

[0002] In the working state of the existing brushless motor, a large amount of heat is generated after the coil winding is energized. These heats will accumulate between the rotor and the stator. When the accumulation reaches a certain level, it will cause the internal temperature of the motor to rise, thereby affecting the performance of the motor. The existing brushless motor dissipates heat from the motor through an external heat dissipation system, but the external heat dissipation system has limited ability to dissipate heat inside the motor, and the external heat dissipation system itself also requires additional power to maintain, increasing the energy consumption cost. Summary of the Invention

[0003] To solve the above problems, the present invention provides a brushless motor, including a stator assembly and a motor rotor sleeved inside the stator assembly. The stator assembly includes a stator ring, a tooth crown extending inward along the inner circumference of the stator ring, a coil winding wound on the tooth crown, and a tooth pole provided at the end of the tooth crown. The motor rotor includes a rotor core, several permanent magnets are embedded in the rotor core, several first accommodation spaces are formed on the circumferential surface of the rotor core, a fan blade assembly is arranged in the first accommodation space, a second accommodation space is formed between the stator assembly and the motor rotor, the first accommodation space communicates with the second accommodation space, a rotating shaft is connected between the rotor core and the fan blade assembly, and the fan blade assembly is sleeved and fixed on the rotating shaft.

[0004] Furthermore, the fan blade assembly includes a connecting ring and several blades extending outward along the outer circumference of the connecting ring. The blades are arranged in the first accommodation space at a preset distance interval, and the connecting ring is sleeved and fixed on the rotating shaft.

[0005] Furthermore, several first through holes are provided on the end surface of the rotor core. The first through holes communicate with the first accommodation space, the first through holes are arranged in a circular array at a preset distance, and the positions of the first through holes are opposite to the spaces between the blades.

[0006] Furthermore, several first through grooves are provided at a position close to the outside of the rotor core. The first through grooves are distributed in a circumferential shape inside the rotor core, and the permanent magnets are embedded in the first through grooves and form a fixed connection with the first through grooves.

[0007] Furthermore, when the permanent magnets are embedded in the first through grooves, there is a gap between the first through grooves and the permanent magnets, and the position of the gap is opposite to the spaces between the blades.

[0008] Furthermore, several first through grooves are provided at positions of the rotor core close to the outer side. The first through grooves are distributed in a circumferential shape outside the rotor core, and the permanent magnets are embedded in the first through grooves and form a fixed connection with the first through grooves.

[0009] Furthermore, wrapping members are provided at both ends of the stator assembly, and several wrapping bodies are provided in the wrapping members. When the wrapping members are connected to the stator assembly, the wrapping bodies partially cover both ends of the tooth crown, and the wrapping bodies are located between the coil windings and the tooth crown.

[0010] Furthermore, a housing is included outside the stator assembly, and a second through hole is provided on the housing.

[0011] Furthermore, a bearing is provided between the housing and the rotor core, and the bearing is sleeved on the rotating shaft.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0013] In this application, several first accommodation spaces are provided in the circumferential surface of the rotor core, and a fan blade assembly is provided in the first accommodation spaces. Then, the rotor core and the fan blade assembly are connected in series by a rotating shaft. While the rotating shaft rotates, it drives the fan blade assembly to rotate synchronously, so that the fan blade assembly generates air volume outside the rotor core, thereby blowing away the heat accumulated in the second accommodation space and forming a good heat dissipation effect. Compared with the prior art, the heat dissipation structure of this application only needs to rely on the rotation of the motor rotor to provide power, without the need to externally connect other power sources, further reducing energy consumption while ensuring a good heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0015] Figure 1 Is the overall structure decomposition of the present invention;

[0016] Figure 2 Is the assembly schematic diagram of the fan blade assembly and the motor rotor of the present invention;

[0017] Figure 3 Is the structural schematic diagram of the first embodiment of the motor rotor of the present invention;

[0018] Figure 4 Is the structural schematic diagram of the second embodiment of the motor rotor of the present invention;

[0019] Figure 5 This is a schematic structural diagram of the stator assembly of the present invention.

[0020] Figure 6 This is a schematic diagram of the air flow of the present invention.

[0021] The reference numerals and names in the figure are as follows:

[0022] Stator assembly 100, motor rotor 200, stator ring 110, tooth crown 120, coil winding 130, tooth pole 140, rotor core 210, permanent magnet 220, first accommodation space 230, fan blade assembly 240, second accommodation space 150, rotating shaft 250, connecting ring 241, blade 242, first through hole 211, first through groove 212, gap 213, wrapper 160, wrapping body 161, housing 300, second through hole 310, bearing 320. Detailed implementation manners

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] A more detailed description of the present invention will be given. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. It should be noted that when an element is expressed as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is expressed as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween.

[0025] In the description of the present invention, it should be noted that the orientation or positional relationships indicated by orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationships shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description. Without contrary instructions, these orientation words do not indicate and imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present invention; the orientation words "inside, outside" refer to the inside and outside relative to the contour of each component itself. In the description of the present invention, it should be noted that the use of words such as "first", "second", etc. to limit the components is only for the convenience of distinguishing the corresponding components. Without otherwise stating, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present invention. In the description of the embodiments of the present application, the meaning of "a plurality" is two or more, unless otherwise clearly and specifically defined.

[0026] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those of ordinary skill in the technical field to which this invention belongs. The terms used in the description of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0027] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0028] Now, in combination with the accompanying drawings, a further description will be made of the preferred embodiments of the present invention. In combination with Figure 1 and Figure 2 As shown, a brushless motor includes a stator assembly 100 and a motor rotor 200 sleeved inside the stator assembly 100. The stator assembly 100 includes a stator ring 110. A tooth crown 120 extends inward along the inner circumference of the stator ring 110. A coil winding 130 is wound around the tooth crown 120. A tooth pole 140 is provided at the end of the tooth crown 120. The motor rotor 200 includes a rotor core 210. A plurality of permanent magnets 220 are embedded in the rotor core 210. A plurality of first accommodation spaces 230 are formed on the circumferential surface of the rotor core 210. A fan blade assembly 240 is arranged in the first accommodation spaces 230. A second accommodation space 150 is formed between the stator assembly 100 and the motor rotor 200. The first accommodation spaces 230 communicate with the second accommodation space 150. A rotating shaft 250 is connected between the rotor core 210 and the fan blade assembly 240. The fan blade assembly 240 is sleeved and fixed on the rotating shaft 250.

[0029] In the working state of this embodiment, as Figure 6As shown, the arrow indicates the direction of air flow. After the stator assembly 100 is energized, the coil winding 130 generates a magnetic field. Under the action of the magnetic field, the permanent magnet 220 drives the motor rotor 200 to rotate within the stator assembly 100, thereby driving the rotating shaft 250 and the fan blade assembly 240 to rotate. During the rotation of the fan blade assembly 240, an outward air vortex will be generated around the rotating shaft 250 in the first accommodation space 230. These air vortices will enter the second accommodation space 150 through the first accommodation space 230, thereby taking away the heat accumulated in the second accommodation space 150.

[0030] In this application, several first accommodation spaces 230 are provided on the circumferential surface of the rotor core 210, and a fan blade assembly 240 is provided in the first accommodation space 230. Then, the rotor core 210 and the fan blade assembly 240 are connected in series by the rotating shaft 250. When the rotating shaft 250 rotates, it drives the fan blade assembly 240 to rotate synchronously, so that the fan blade assembly 240 generates air volume outward from the rotor core 210, thereby blowing away the heat accumulated in the second accommodation space 150 and forming a good heat dissipation effect. Compared with the prior art, the heat dissipation structure of this application only needs to rely on the rotation of the motor rotor 200 to provide power, without connecting other external power sources, further reducing energy consumption while ensuring a good heat dissipation effect.

[0031] Furthermore, on the basis of the above embodiment, as Figure 2 shown, the fan blade assembly 240 includes a connecting ring 241 and several blades 242 extending outward along the outer circumference of the connecting ring 241. The blades 242 are arranged in the first accommodation space 230 at preset intervals. The connecting ring 241 is sleeved and fixed on the rotating shaft 250. When the rotating shaft 250 rotates, it drives the blades 242 to rotate in the first accommodation space 230, thereby generating an outward high-speed air vortex around the rotating shaft 250 in the first accommodation space 230. Also, since the first accommodation space 230 is in communication with the second accommodation space 150, these high-speed air vortices will rush into the second accommodation space 150, dispersing the heat generated by the coil winding 130, thereby achieving a good heat dissipation effect.

[0032] Furthermore, on the basis of the above embodiment, in combination with Figure 2 and Figure 3As shown, a plurality of first through holes 211 are provided on the end face of the rotor core 210. The first through holes 211 communicate with the first accommodation space 230. The first through holes 211 are arranged in a circular array at a preset distance. The positions of the first through holes 211 are opposite to those between the blades 242. Thus, when the rotor core 210 rotates driven by a magnetic field, external air will enter the first accommodation space 230 through the first through holes 211, and thus will rotate with the blades 242 in the first accommodation space 230, generating an outward high-speed air vortex in the first accommodation space 230, and then flowing out to the outside through the second accommodation space 150, thereby forming a heat dissipation cycle.

[0033] Furthermore, on the basis of the above-mentioned embodiment, as Figure 3 shown, a plurality of first through grooves 212 are provided at positions of the rotor core 210 close to the outside. The first through grooves 212 are distributed in a circumferential shape inside the rotor core 210. The permanent magnets 220 are embedded in the first through grooves 212 and form a fixed connection with the first through grooves 212. Thus, an embedded connection is formed between the permanent magnets 220 and the first through grooves 212. Compared with the traditional method of surface-mounting the permanent magnets 220 on the surface of the rotor core 210, the embedded connection makes the connection between the permanent magnets 220 and the rotor core 210 more firm. When the rotor core 210 rotates, the permanent magnets 220 will not fall off from the rotor core 210.

[0034] Furthermore, on the basis of the above-mentioned embodiment, as Figure 3 shown, when the permanent magnets 220 are embedded in the first through grooves 212, there is a gap 213 between the first through grooves 212 and the permanent magnets 220. The position of the gap 213 is opposite to that between the blades 242. Because the magnetic field of the rotor core 210 has the effect of "magnetic hysteresis loop", part of the magnetic energy converted from electrical energy will be generated, and then part of it will continue to be converted into heat energy, which may cause the permanent magnets 220 to heat up. Therefore, a gap 213 is provided between the first through grooves 212 and the permanent magnets 220. Thus, when the rotor core 210 rotates, air flow will pass through the gap 213, thereby taking away the heat of the permanent magnets 220 and entering the first accommodation space 230, thus playing a role in heat dissipation.

[0035] In addition, the present application also provides a second structure of the rotor core 210. The difference from the first structure of the rotor core 210 is that, as Figure 4As shown, the first through-grooves 212 are circumferentially distributed outside the rotor core 210. The permanent magnets 220 are embedded in the first through-grooves 212 and form a fixed connection with the first through-grooves 212. Thus, compared with the structure of the first rotor core 210, in this embodiment, there is no need to form a gap 213 between the first through-grooves 212 and the permanent magnets 220, which simplifies the structure of the rotor core 210 and reduces the processing cost of the rotor core 210.

[0036] Furthermore, on the basis of the above embodiments, as Figure 5 shown, there are wrapping members 160 provided at both ends of the stator assembly 100. A number of wrapping bodies 161 are provided inside the wrapping members 160. When the wrapping members 160 are assembled with the stator assembly 100, the wrapping bodies 161 partially cover both ends of the tooth crown 120, and the wrapping bodies 161 are located between the coil windings 130 and the wrapping members 160. Thus, the wrapping bodies 161 can prevent contact between the coil windings 130 and the tooth crown 120. After the coil windings 130 are electrified and conduct heat, the heat transfer to the stator assembly 100 can be reduced, and the heat is concentrated and dissipated into the second accommodation space 150, thereby making the heat dissipation effect better.

[0037] Furthermore, on the basis of the above embodiments, as Figure 1 shown, the outside of the stator assembly 100 includes a housing 300. A second through-hole 310 is provided on the housing 300. When the motor rotor 200 rotates, external air will enter the motor through the second through-hole 310.

[0038] Furthermore, on the basis of the above embodiments, as Figure 1 shown, a bearing 320 is provided between the housing 300 and the rotor core 210. The bearing 320 is sleeved on the rotating shaft 250, thereby playing a supporting role for the rotating shaft 250.

[0039] Details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any regard, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within the present invention.

Claims

1. A brushless motor, comprising a stator assembly (100) and a motor rotor (200) sleeved inside the stator assembly (100), the stator assembly (100) includes a stator ring (110), a tooth crown (120) is arranged to extend inwards along the inner circumference of the stator ring (110), a coil winding (130) is wound on the tooth crown (120), the motor rotor (200) includes a rotor core (210), and a plurality of permanent magnets (220) are embedded in the rotor core (210), characterized in that, A plurality of first accommodation spaces (230) are formed on the circumferential surface of the rotor core (210). A fan blade assembly (240) is arranged in the first accommodation spaces (230). A second accommodation space (150) is formed between the stator assembly (100) and the motor rotor (200). The first accommodation spaces (230) communicate with the second accommodation space (150). A rotating shaft (250) is connected between the rotor core (210) and the fan blade assembly (240). The fan blade assembly (240) is sleeved and fixed on the rotating shaft (250).

2. The brushless motor according to claim 1, characterized in that, The fan blade assembly (240) includes a connecting ring (241) and a plurality of blades (242) extending outward along the outer circumference of the connecting ring (241). The blades (242) are arranged in the first accommodation spaces (230) at preset intervals. The connecting ring (241) is sleeved and fixed on the rotating shaft (250).

3. The brushless motor according to claim 2, characterized in that, A plurality of first through holes (211) are provided on the end face of the rotor core (210). The first through holes (211) communicate with the first accommodation spaces (230). The first through holes (211) are arranged in a circular array at preset intervals. The positions of the first through holes (211) are opposite to the spaces between the blades (242).

4. The brushless motor according to claim 3, wherein A plurality of first through grooves (212) are provided at positions of the rotor core (210) close to the outside. The first through grooves (212) are circumferentially distributed inside the rotor core (210). The permanent magnets (220) are embedded in the first through grooves (212) and form a fixed connection with the first through grooves (212).

5. The brushless motor according to claim 4, wherein, When the permanent magnets (220) are embedded in the first through grooves (212), there are gaps (213) between the first through grooves (212) and the permanent magnets (220). The positions of the gaps (213) are opposite to the spaces between the blades (242).

6. The brushless motor according to claim 3, wherein A plurality of first through grooves (212) are provided at positions of the rotor core (210) close to the outside. The first through grooves (212) are circumferentially distributed outside the rotor core (210). The permanent magnets (220) are embedded in the first through grooves (212) and form a fixed connection with the first through grooves (212).

7. The brushless motor according to claim 1, wherein, Wrapping members (160) are provided at both ends of the stator assembly (100). A plurality of wrapping bodies (161) are arranged in the wrapping members (160). When the wrapping members (160) are connected to the stator assembly (100), the wrapping bodies (161) partially cover both ends of the tooth crown (120), and the wrapping bodies (161) are located between the coil windings (130) and the tooth crown (120).

8. The brushless motor according to claim 1, characterized in that, A housing (300) is included outside the stator assembly (100). A second through hole (310) is provided on the housing (300).

9. The brushless motor according to claim 8, characterized in that, A bearing (320) is provided between the housing (300) and the rotor core (210). The bearing (320) is sleeved on the rotating shaft (250).

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