Heat dissipation structure of brushless motor
By setting a fan blade assembly inside the rotor core and using the rotor rotation to drive an air vortex for heat dissipation, the problem of heat accumulation inside the brushless motor is solved, achieving efficient heat dissipation without external power supply dependence and reducing energy consumption.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-16
- Publication Date
- 2026-03-24
AI Technical Summary
When existing brushless motors are in operation, the heat generated by the energized coil windings accumulates between the rotor and stator, causing the internal temperature of the motor to rise. Existing external cooling systems have limited cooling effect and increase energy consumption.
Several first receiving spaces are set in the circumferential surface of the rotor core, and fan blade assemblies are arranged in them. The rotor rotation drives the fan blade assemblies to rotate, and the air vortex is used to blow away the heat, forming a good heat dissipation effect without relying on an external power source.
It achieves efficient heat dissipation of the brushless motor, reduces energy consumption, and ensures good heat dissipation effect, relying solely on the rotation of the motor rotor to provide power.
Smart Images
Figure CN224037214U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a heat dissipation structure field, more particularly to a brushless motor's heat dissipation structure. BACKGROUND
[0002] The existing brushless motor in the working state, since the coil winding will produce a lot of heat after electrification, these heat will accumulate between the rotor and the stator, when the accumulation reaches a certain degree, will cause the motor internal temperature to rise, thereby influence the performance of the motor. The existing brushless motor carries out the heat dissipation to the motor through the external heat dissipation system, but the internal heat dissipation ability of the external heat dissipation system to the motor is limited, and the external heat dissipation system itself also needs additional power to maintain, and the energy consumption cost is increased. SUMMARY
[0003] In order to solve the above problems, the utility model provides a brushless motor's heat dissipation structure, including the stator assembly and the motor rotor of the stator assembly inside the sleeve, the stator assembly includes the stator ring, the inner circumference of the stator ring is provided with the tooth crown along the inward extension, the coil winding is wound on the tooth crown, the tooth pole is provided at the end of the tooth crown, the motor rotor includes the rotor core, a plurality of permanent magnets are embedded in the rotor core, a plurality of first accommodating spaces are formed on the circumferential surface of the rotor core, a plurality of fan blade assemblies are arranged in the first accommodating space, a second accommodating space is formed between the stator assembly and the motor rotor, the first accommodating space and the second accommodating space are communicated with each other, 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] Further, the fan blade assembly includes a connecting ring and a plurality of blades extending outward along the outer circumference of the connecting ring, the blades are arranged in the first accommodating space at a preset distance, and the connecting ring is sleeved and fixed on the rotating shaft.
[0005] Further, a plurality of first through holes are arranged on the end face of the rotor core, the first through holes are communicated with the first accommodating space, the first through holes are circularly arranged at a preset distance, and the positions of the first through holes are opposite to the positions between the blades.
[0006] Further, a plurality of first through grooves are arranged on the position close to the outer side of the rotor core, the first through grooves are circularly distributed in the rotor core, and the permanent magnets are embedded in the first through grooves and are fixedly connected with the first through grooves.
[0007] Further, when the permanent magnets are embedded in the first through grooves, gaps are formed between the first through grooves and the permanent magnets, and the positions of the gaps are opposite to the positions between the blades.
[0008] Further, the rotor core is provided with a plurality of first through-slots at a position close to the outer side, the first through-slots are distributed in a circle on the outside of the rotor core, and the permanent magnets are embedded in the first through-slots and fixedly connected with the first through-slots.
[0009] Further, the stator assembly is provided with a wrapping member at both ends, a plurality of wrapping bodies are arranged in the wrapping member, when the wrapping member is connected with the stator assembly, the wrapping bodies partially cover both ends of the tooth crown, and the wrapping bodies are located between the coil winding and the tooth crown.
[0010] Further, the stator assembly is provided with a plurality of first through-slots at a position close to the outer side, the first through-slots are distributed in a circle on the outside of the rotor core, and the permanent magnets are embedded in the first through-slots and fixedly connected with the first through-slots.
[0011] Further, the stator assembly is provided with a plurality of first through-slots at a position close to the outer side, the first through-slots are distributed in a circle on the outside of the rotor core, and the permanent magnets are embedded in the first through-slots and fixedly connected with the first through-slots.
[0012] Compared with the prior art, the utility model has the advantages that:
[0013] The rotor core is provided with a plurality of first through-slots at a position close to the outer side, the first through-slots are distributed in a circle on the outside of the rotor core, and the permanent magnets are embedded in the first through-slots and fixedly connected with the first through-slots. BRIEF DESCRIPTION OF DRAWINGS
[0014] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed in the following embodiment or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.
[0015] Figure 1 The overall structure of the present application is decomposed;
[0016] Figure 2 The assembly diagram of the fan blade assembly and the motor rotor of the present application is shown;
[0017] Figure 3 The structure diagram of the first embodiment of the motor rotor of the present application is shown;
[0018] Figure 4The structure schematic diagram of the motor rotor second embodiment of the utility model.
[0019] Figure 5 The structure schematic diagram of the stator assembly of the utility model.
[0020] Figure 6 The air flow schematic diagram of the utility model.
[0021] The reference signs and names in the drawing 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 containing space 230, fan blade assembly 240, second containing space 150, rotating shaft 250, connecting ring 241, blade 242, first through hole 211, first through slot 212, gap 213, wrapping piece 160, wrapping body 161, shell 300, second through hole 310, bearing 320. DETAILED DESCRIPTION
[0023] The technical solutions in the embodiments of the utility model will be described clearly and completely below, obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the person skilled in the art without creative labor are within the protection scope of the utility model.
[0024] The utility model will be described in more detail. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model. It should be noted that when an element is described as "fixed to" another element, it can be directly on another element, or one or more intermediate elements can exist therebetween. When an element is described as "connected to" another element, it can be directly connected to another element, or one or more intermediate elements can exist therebetween.
[0025] In the description of the utility model, it should be explained that the orientation words such as "front, back, top, bottom, left, right", "transverse, vertical, perpendicular, horizontal" and "top, bottom" and the orientation or position relation indicated usually are based on the orientation or position relation shown in the drawing, just for the convenience of describing the utility model and simplifying the description, under the condition of not making the opposite statement, these orientation words do not indicate and imply that the device or element must have a particular orientation or be constructed and operated in a particular orientation, therefore can not be understood as the limitation of the protection scope of the utility model;The orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.In the description of the utility model, it should be explained that the words "first", "second" and the like are used to limit parts, just for the convenience of distinguishing the corresponding parts, such as no further declaration, the above words do not have special meaning, therefore can not be understood as the limitation of the protection scope of the utility model.In the description of the embodiment of the application, the meaning of "a plurality of" is two and above, unless there is a clear specific limitation.
[0026] Unless otherwise defined, all technical and scientific terms used in the specification are the same as the meanings understood by the person skilled in the art belonging to the technical field of the utility model. The terms used in the specification of the utility model are only for the purpose of describing the specific embodiments and are not used to limit the utility model.
[0027] In addition, the technical features involved in different embodiments of the application described below can be combined with each other as long as there is no conflict.
[0028] The preferred embodiments of the utility model will be further described in conjunction with the drawings, and the preferred embodiments of the utility model will be further described in conjunction with the drawings Figure 1 And Figure 2 The heat dissipation structure of the brushless motor shown in the figure, including the stator assembly 100 and the motor rotor 200 sleeved in the stator assembly 100, the stator assembly 100 includes the stator ring 110, the tooth crown 120 is provided along the inner circumference of the stator ring 110 and extends inward, the coil winding 130 is wound on the tooth crown 120, the tooth pole 140 is arranged at the end of the tooth crown 120, the motor rotor 200 includes the rotor core 210, a plurality of permanent magnets 220 are embedded in the rotor core 210, a plurality of first accommodating spaces 230 are formed on the circumferential surface of the rotor core 210, the fan blade assembly 240 is arranged in the first accommodating space 230, the second accommodating space 150 is formed between the stator assembly 100 and the motor rotor 200, the first accommodating space 230 and the second accommodating space 150 are communicated with each other, the rotating shaft 250 is connected between the rotor core 210 and the fan blade assembly 240, and the fan blade assembly 240 is sleeved and fixed on the rotating shaft 250.
[0029] In the working state of the embodiment, as Figure 6As shown, the arrow thereof represents the flow direction of air, the energized coil winding 130 of the stator assembly 100 generates a magnetic field, the permanent magnet 220 is driven by the magnetic field, drives the motor rotor 200 to rotate in the stator assembly 100, thereby driving the rotating shaft 250 and the fan assembly 240 to rotate, the fan assembly 240 generates outward air vortexes in the first containing space 230 with the rotating shaft 250 as the center during rotation, and the air vortexes enter the second containing space 150 through the first containing space 230, thereby taking away the heat accumulated in the second containing space 150.
[0030] The application sets the rotor core 210 in the circumferential surface, sets the fan assembly 240 in the first containing space 230, and then connects the rotor core 210 and the fan assembly 240 in series through the rotating shaft 250, the rotating shaft 250 drives the fan assembly 240 to rotate synchronously while rotating, so that the fan assembly 240 generates air volume outward of the rotor core 210, thereby blowing away the accumulated heat of the second containing space 150, forming a good heat dissipation effect, compared with the prior art, the heat dissipation structure of the application only needs to rely on the rotation of the motor rotor 200 to provide power, without external access to other power supply, further reducing energy consumption while also ensuring good heat dissipation effect.
[0031] In addition to the above embodiments, as shown, Figure 2 The fan 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 containing space 230 at a predetermined distance, and the connecting ring 241 is fixed on the rotating shaft 250, when the rotating shaft 250 rotates, the blades 242 rotate in the first containing space 230, thereby forming high-speed air vortexes in the first containing space 230 with the rotating shaft 250 as the center, and since the first containing space 230 and the second containing space 150 are in communication, the high-speed air vortexes rush into the second containing space 150, blow away the heat generated by the coil winding 130, thereby achieving good heat dissipation effect.
[0032] In addition to the above embodiments, in combination with Figure 2 and Figure 3As shown, a plurality of first through holes 211 are arranged on the end face of the rotor core 210, the first through holes 211 are communicated with the first accommodating space 230, the first through holes 211 are circularly arranged at a preset distance, and the positions of the first through holes 211 are opposite to the spaces between the blades 242. When the rotor core 210 rotates under the drive of the magnetic field, the external air enters the first accommodating space 230 through the first through holes 211, and then rotates along with the blades 242 in the first accommodating space 230, so as to generate the outward high-speed air vortex in the first accommodating space 230, and then the air vortex flows out to the outside through the second accommodating space 150, thereby forming the heat dissipation circulation.
[0033] Further based on the above embodiment, as shown in Figure 3 As shown, a plurality of first through grooves 212 are arranged on the rotor core 210 close to the outer side, the first through grooves 212 are circularly arranged in the rotor core 210, and the permanent magnets 220 are embedded in the first through grooves 212 and fixedly connected with the first through grooves 212. In this way, the embedded connection is formed between the permanent magnets 220 and the first through grooves 212. Compared with the traditional surface mounting of 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, and the permanent magnets 220 will not fall off from the rotor core 210 when the rotor core 210 rotates.
[0034] Further based on the above embodiment, as shown in Figure 3 As shown, when the permanent magnets 220 are embedded in the first through grooves 212, gaps 213 are formed between the first through grooves 212 and the permanent magnets 220, and the positions of the gaps 213 are opposite to the spaces between the blades 242. Because the magnetic field of the rotor core 210 has the effect of "magnetic hysteresis loop", part of the electric energy is converted into magnetic energy, and then part of the magnetic energy is further converted into heat energy, which may cause the permanent magnets 220 to heat. Therefore, the gaps 213 are arranged between the first through grooves 212 and the permanent magnets 220. In this way, when the rotor core 210 rotates, the air flow passes through the gaps 213, so as to take away the heat of the permanent magnets 220 into the first accommodating space 230, thereby playing a heat dissipation role.
[0035] In addition, the application also provides a second rotor core 210 structure, which is different from the first rotor core 210 structure in that Figure 4As shown, the first through slot 212 is circumferentially distributed outside the rotor core 210, and the permanent magnet 220 is embedded in the first through slot 212 and fixedly connected with the first through slot 212, so that compared with the first rotor core 210 structure, the embodiment does not need to form a gap 213 between the first through slot 212 and the permanent magnet 220, simplifying the structure of the rotor core 210 and reducing the processing cost of the rotor core 210.
[0036] Further based on the above embodiment, as shown in Figure 5 As shown, the stator assembly 100 is provided with a wrapping piece 160 at both ends, and a plurality of wrapping bodies 161 are arranged in the wrapping piece 160. When the wrapping piece 160 is 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 winding 130 and the wrapping bodies 161. Thus, the wrapping bodies 161 can avoid contact between the coil winding 130 and the tooth crown 120, so that after the coil winding 130 is energized and heated, the heat can be reduced to be transmitted to the stator assembly 100, and concentratedly dissipated into the second containing space 150, so that the heat dissipation effect is better.
[0037] Further based on the above embodiment, as shown in Figure 1 As shown, the stator assembly 100 comprises a housing 300, and a second through hole 310 is arranged on the housing 300. When the motor rotor 200 rotates, external air enters the motor interior through the second through hole 310.
[0038] Further based on the above embodiment, as shown in Figure 1 As shown, a bearing 320 is arranged between the housing 300 and the rotor core 210, and the bearing 320 is sleeved on the rotating shaft 250, thereby supporting the rotating shaft 250.
[0039] The details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of the present application, the present application can be realized in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application.
Claims
1. A heat dissipation structure for a brushless motor, comprising a stator assembly (100) and a motor rotor (200) sleeved inside the stator assembly (100), wherein the stator assembly (100) includes a stator ring (110), a tooth crown (120) extending inward along the inner circumference of the stator ring (110), a coil winding (130) is wound on the tooth crown (120), and a tooth pole (140) is provided at the end of 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 receiving spaces (230) are formed on the circumferential surface of the rotor core (210). A fan blade assembly (240) is disposed in the first receiving space (230). A second receiving space (150) is formed between the stator assembly (100) and the motor rotor (200). The first receiving spaces (230) and the second receiving spaces (150) are interconnected. 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 heat dissipation structure of 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 at preset intervals in the first receiving space (230), and the connecting ring (241) is sleeved and fixed on the rotating shaft (250).
3. The heat dissipation structure of 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 accommodating space (230). The first through holes (211) are arranged in a circular pattern at a preset distance. The positions of the first through holes (211) are directly opposite the blades (242).
4. The heat dissipation structure of the brushless motor according to claim 3, characterized in that, The rotor core (210) has several first through slots (212) near its outer side. The first through slots (212) are distributed in a circumferential shape inside the rotor core (210). The permanent magnet (220) is embedded in the first through slot (212) and forms a fixed connection with the first through slot (212).
5. The heat dissipation structure of the brushless motor according to claim 4, characterized in that, When the permanent magnet (220) is embedded in the first through groove (212), there is a gap (213) between the first through groove (212) and the permanent magnet (220), and the position of the gap (213) is directly opposite to the blade (242).
6. The heat dissipation structure of the brushless motor according to claim 3, characterized in that, The rotor core (210) has several first through slots (212) near its outer side. The first through slots (212) are distributed in a circumferential shape on the outside of the rotor core (210). The permanent magnet (220) is embedded in the first through slot (212) and forms a fixed connection with the first through slot (212).
7. The heat dissipation structure of the brushless motor according to claim 1, characterized in that, A wrapping member (160) is provided at both ends of the stator assembly (100), and a plurality of wrapping bodies (161) are provided inside the wrapping member (160). When the wrapping member (160) is connected to the stator assembly (100), the wrapping body (161) partially covers both ends of the tooth crown (120), and the wrapping body (161) is located between the coil winding (130) and the tooth crown (120).
8. The heat dissipation structure of the brushless motor according to claim 1, characterized in that, The stator assembly (100) includes a housing (300) on its exterior, and a second through hole (310) is provided on the housing (300).
9. The heat dissipation structure of the brushless motor according to claim 8, characterized in that, A bearing (320) is provided between the housing (300) and the rotor core (210), and the bearing (320) is sleeved on the rotating shaft (250).