A brushless motor

Abstract

The utility model discloses a brushless motor, including stator seat, stator winding, rotor seat, rotor winding, motor shaft and heat dissipation fan, be provided with first rotation cavity in stator seat, stator winding is installed on the inner wall of stator seat, the rotor seat rotation is arranged in first rotation cavity and is provided with the heat dissipation cavity of rear end open mouth on it, and the outer wall of rotor seat is installed with a plurality of flow guide hole that is in communication with first rotation cavity and heat dissipation cavity and is arranged in the circumference, rotor winding is installed with stator winding opposite arrangement, motor shaft is installed in the front end of rotor seat, heat dissipation fan is arranged in heat dissipation cavity and is connected with rotor seat, through setting up the heat dissipation cavity of rear end open mouth directly on the rotor seat, heat dissipation fan is directly arranged in the heat dissipation cavity and is connected with rotor seat, and the rear end open mouth design of heat dissipation cavity provides the spacious assembly space for fan, and the installation difficulty is reduced greatly, and the assembly time is shortened, and the production assembly efficiency of motor whole is improved significantly.

Description

Technical Field

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

[0002] In the field of motors, brushless motors are widely used in various fields such as industrial production, home appliances, and automotive electronics due to their advantages of high efficiency, long lifespan, and low noise. However, with the continuous improvement of power density and increasingly complex operating conditions, core components such as stator and rotor windings generate a large amount of heat during motor operation. If this heat cannot be dissipated in time, the internal temperature of the motor will rise, which will not only reduce the motor's operating efficiency and affect its output performance, but may also accelerate the aging of insulation materials, shorten the motor's lifespan, and even cause overheating failures.

[0003] To address heat dissipation issues, existing brushless motors typically incorporate cooling fans. However, traditional cooling fan installation structures have significant drawbacks: most fans employ an integrated design, directly embedded within a complex chamber inside the motor housing, requiring additional mounting brackets and transmission structures to link with the motor rotor or shaft. This integrated installation method not only limits the fan's assembly space but also necessitates precise alignment of multiple transmission components and mounting points during installation, making the process cumbersome and time-consuming. Furthermore, when the fan malfunctions and requires repair or replacement, the motor housing and internal transmission structure must be disassembled, a complex process that may cause unnecessary damage to other core motor components, severely impacting maintenance convenience. In addition, the complex airflow channel design between the fan integrated within the motor and the motor's core heat-generating components can also limit heat dissipation efficiency, failing to fully meet the motor's cooling requirements. Utility Model Content

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a brushless motor.

[0005] The technical solution adopted by one embodiment of this utility model to solve its technical problem is: a brushless motor, including a stator base, stator windings, a rotor base, rotor windings, a motor shaft, and a cooling fan; The stator base is provided with a first rotating cavity; The stator winding assembly is mounted on the inner wall of the stator base; The rotor base is rotatably disposed in the first rotating cavity and has a heat dissipation cavity with an open rear end on it. The rotor base is circumferentially provided with a number of guide holes that communicate with the first rotating cavity and the heat dissipation cavity. The rotor windings are mounted on the outer wall of the rotor housing and arranged opposite to the stator windings. The motor shaft is mounted at the front end of the rotor base; The cooling fan is installed inside the cooling cavity and connected to the rotor base; The cooling fan can rotate with the rotor base to draw air from the first rotating chamber and the cooling chamber and blow it to the outside.

[0006] As one of the preferred embodiments of this utility model, the stator base includes a sleeve, a front cover and a rear cover. The front cover is installed at the front end of the sleeve, and the rear cover is installed at the rear end of the sleeve. The three together form a first rotating cavity, and the stator winding is installed on the inner wall of the sleeve.

[0007] As one of the preferred embodiments of this utility model, a first bearing is provided between the rotor base and the front cover, and a second bearing is provided between the rotor base and the rear cover.

[0008] As one of the preferred embodiments of this utility model, a brushless motor further includes a pressure cover and a planetary gear assembly. The pressure cover is installed at the front end of the stator base, and the pressure cover and the stator base together form a second rotating cavity. The motor shaft extends into the second rotating cavity, and the planetary gear assembly is disposed in the second rotating cavity and mounted on the motor shaft.

[0009] As one of the preferred embodiments of this utility model, the planetary gear assembly includes a planet carrier, a sun gear, and multiple planetary gears. The planet carrier is mounted on the cover, the sun gear is mounted on the motor shaft, and the planetary gears mesh with the planet carrier and the sun gear respectively.

[0010] As one of the preferred embodiments of this utility model, a brushless motor further includes an end cover and at least one third bearing. The end cover is installed at the front end of the pressure cover, the motor shaft extends to the outside of the end cover, and the third bearing is connected between the end cover and the motor shaft.

[0011] In one of the preferred embodiments of this utility model, the third bearing is configured as two bearings and arranged at intervals along the axial direction of the motor shaft.

[0012] As one of the preferred embodiments of this utility model, the cooling fan includes a base and a plurality of fan blades evenly distributed around the base. One end of the fan blade is connected to the base, and the other end is arranged opposite to the air guide hole.

[0013] In one of the preferred embodiments of this utility model, the cooling fan is connected to the rotor seat by multiple bolts.

[0014] As one of the preferred embodiments of this utility model, the side wall of the stator base is provided with heat dissipation holes that communicate with the outside and the first rotating cavity.

[0015] The beneficial effects of this utility model are as follows: A brushless motor includes a stator base, stator windings, a rotor base, rotor windings, a motor shaft, and a cooling fan; a first rotating cavity is provided inside the stator base; the stator windings are assembled on the inner wall of the stator base; the rotor base is rotatably disposed within the first rotating cavity and has a rear-end open cooling cavity provided thereon, and the rotor base has several guide holes circumferentially arranged communicating with the first rotating cavity and the cooling cavity; the rotor windings are assembled on the outer wall of the rotor base and arranged opposite to the stator windings; the motor shaft is mounted on the front end of the rotor base; the cooling fan is disposed within the cooling cavity and... It connects to the rotor base; the cooling fan can rotate with the rotor base to draw air from the first rotating cavity and the cooling cavity and blow it to the outside; by directly opening the cooling cavity with an open rear end on the rotor base, the cooling fan is directly set in the cooling cavity and connected to the rotor base. The open rear end design of the cooling cavity provides ample assembly space for the fan. During installation, it is only necessary to put the fan into the cooling cavity and fix it to the rotor base. There is no need to precisely align multiple transmission components inside the motor, which greatly reduces the installation difficulty, shortens the assembly time, and significantly improves the overall production and assembly efficiency of the motor. Attached Figure Description

[0016] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a brushless motor. Figure 2 An exploded view of a brushless motor; Figure 3 This is a cross-sectional view of a brushless motor. Detailed Implementation

[0017] This section will describe in detail the specific embodiments of the present utility model. The preferred embodiments of the present utility model are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present utility model, but they should not be construed as limiting the scope of protection of the present utility model.

[0018] In the description of this utility model, "multiple" means two or more; "greater than," "less than," and "exceeding" are understood to exclude the stated number; "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or their sequential relationship.

[0019] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In this utility model, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0021] Reference Figures 1-3 A brushless motor includes a stator base 10, a stator winding, a rotor base 20, a rotor winding 30, a motor shaft 40, and a cooling fan 50. The stator base 10 is provided with a first rotating cavity 61; The stator winding assembly is mounted on the inner wall of the stator base 10; The rotor base 20 is rotatably disposed in the first rotating cavity 61 and has a heat dissipation cavity 21 with an open rear end. The rotor base 20 is provided with a plurality of guide holes 22 in the circumferential direction that communicate with the first rotating cavity 61 and the heat dissipation cavity 21. The rotor winding 30 is mounted on the outer wall of the rotor base 20 and is arranged opposite to the stator winding. The motor shaft 40 is mounted on the front end of the rotor base 20. In some embodiments, the motor shaft 40 is integrally formed on the front end of the rotor base 20. The cooling fan 50 is disposed inside the cooling cavity 21 and connected to the rotor seat 20; The cooling fan 50 can rotate with the rotor base 20 to draw air from the first rotating cavity 61 and the cooling cavity 21 and blow it to the outside.

[0022] Reference Figures 1-3 Preferably, the stator base 10 includes a sleeve 11, a front cover 12 and a rear cover 13. The front cover 12 is installed at the front end of the sleeve 11 and the rear cover 13 is installed at the rear end of the sleeve 11. The three together form a first rotating cavity 61, and the stator winding is installed on the inner wall of the sleeve 11.

[0023] Specifically, the stator base 10 consists of a sleeve 11, a front cover 12, and a rear cover 13. First, the stator winding is evenly wound and fixed on the inner wall of the sleeve 11 to ensure the arrangement accuracy of the stator winding and to ensure the electromagnetic coupling effect with the rotor winding 30. Then, the front cover 12 is fixed to the front end of the sleeve 11 with bolts, and the rear cover 13 is fixed to the rear end of the sleeve 11. The three together form a closed first rotating cavity 61, providing a stable installation space for the rotation of the rotor base 20. At the same time, the side wall of the stator base 10 is provided with heat dissipation holes 92 that communicate with the outside and the first rotating cavity 61. The heat dissipation holes 92 penetrate the side wall of the sleeve 11 to realize the communication between the first rotating cavity 61 and the external environment, providing a channel for airflow circulation.

[0024] Reference Figures 1-3 Furthermore, the rotor assembly includes a rotor base 20, a rotor winding 30, a motor shaft 40, and a cooling fan 50. First, the rotor winding 30 is fixed to the outer wall of the rotor base 20, ensuring a uniform relative clearance between the rotor winding 30 and the stator winding. Next, the motor shaft 40 is fixed to the center of the front end of the rotor base 20 via an interference fit or key connection, ensuring coaxiality between the motor shaft 40 and the rotor base 20. Subsequently, a rear-opening heat dissipation cavity 21 is opened at the rear end of the rotor base 20, and several... A guide hole 22 is formed, with its two ends penetrating the inner and outer walls of the rotor base 20, respectively, so that the first rotating cavity 61 and the heat dissipation cavity 21 form a communication channel. Finally, the cooling fan 50 is installed in the heat dissipation cavity 21 and connected to the rotor base 20 by multiple bolts 91. The cooling fan 50 includes a base 51 and multiple fan blades 52 evenly distributed around the base 51. One end of the fan blade 52 is connected to the base 51, and the other end is arranged opposite to the guide hole 22, so as to ensure that the fan blade 52 can accurately draw air from the guide hole 22 when it rotates.

[0025] Reference Figures 1-3 Furthermore, to enable the rotor base 20 to rotate flexibly, a first bearing 71 is provided between the rotor base 20 and the front cover 12, and a second bearing 72 is provided between the rotor base 20 and the rear cover 13. By having the inner ring of the bearing engage with the outer wall of the rotor base 20 and the outer ring engage with the inner wall of the front cover 12 / rear cover 13, the frictional resistance of the rotor base 20 during rotation is reduced. Subsequently, the assembled rotor assembly is installed into the first rotating cavity 61, so that the first bearing 71 and the second bearing 72 are respectively engaged in the bearing mounting grooves of the front cover 12 and the rear cover 13, thus completing the positioning of the rotor assembly.

[0026] Reference Figures 1-3In some embodiments, a brushless motor further includes a cover 14 and a planetary gear assembly 80. The cover 14 is mounted on the front end of the stator base 10, and the cover 14 and the stator base 10 together form a second rotating cavity 62. The motor shaft 40 extends into the second rotating cavity 62, and the planetary gear assembly 80 is disposed in the second rotating cavity 62 and mounted on the motor shaft 40. Preferably, the planetary gear assembly 80 includes a planet carrier 81, a sun gear 82, and a plurality of planet gears 83. The planet carrier 81 is mounted on the cover 14, the sun gear 82 is mounted on the motor shaft 40, and the planet gears 83 mesh with the planet carrier 81 and the sun gear 82, respectively.

[0027] Specifically, a pressure cover 14 is fixed to the front end of the stator base 10, and the pressure cover 14 and the front cover 12 form a second rotating cavity 62; the planetary gear assembly 80 is installed into the second rotating cavity 62, wherein the planet carrier 81 is fixed to the inner wall of the pressure cover 14 by bolts, the sun gear 82 is fixed to the part of the motor shaft 40 extending into the second rotating cavity 62, and multiple planetary gears 83 are mounted on the planet carrier 81 by pins, and the planetary gears 83 simultaneously mesh with the sun gear 82 and the internal gear ring of the planet carrier 81 to achieve power reduction transmission; finally, an end cover 15 is fixed to the front end of the pressure cover 14. Furthermore, a brushless motor also... The device includes an end cover 15 and at least one third bearing 73. The end cover 15 is mounted on the front end of the pressure cover 14. The motor shaft 40 extends to the outside of the end cover 15. The third bearing 73 is connected between the end cover 15 and the motor shaft 40. Furthermore, there are two third bearings 73 arranged at an axial distance along the motor shaft 40. By assembling two third bearings 73 between the end cover 15 and the motor shaft 40, and arranging the two third bearings 73 at an axial distance along the motor shaft 40, the support stability of the output end of the motor shaft 40 is further improved. The front end of the motor shaft 40 extends to the outside through the end cover 15 for connecting the load.

[0028] When the brushless motor is powered on, three-phase alternating current is applied to the stator winding to generate a rotating magnetic field. The rotating magnetic field generates an electromagnetic torque between itself and the rotor winding 30, causing the rotor base 20 to rotate around its axis. The rotor base 20 synchronously drives the motor shaft 40 to rotate, and the sun gear 82 on the motor shaft 40 rotates accordingly. Through the meshing transmission between the sun gear 82 and the planet gears 83, the power is transmitted to the planet carrier 81. The planet carrier 81 achieves power output through connection with the external load. At the same time, through the deceleration effect of the planet gear assembly 80, the load's requirements for output speed and torque are met.

[0029] When the rotor base 20 rotates, the cooling fan 50, which is fixedly connected to the rotor base 20 by bolts 91, rotates synchronously with the rotor base 20, forming a rotating airflow. Since the fan blades 52 of the cooling fan 50 are arranged opposite to the guide holes 22, the fan blades 52 generate negative pressure in the heat dissipation cavity 21 when they rotate, which in turn draws air from the first rotating cavity 61 through the guide holes 22. The air in the first rotating cavity 61 carries the heat generated by the stator winding and rotor winding 30 during operation and is drawn into the heat dissipation cavity 21 through the guide holes 22. Then, under the thrust of the fan blades 52, it is blown out to the external environment from the rear opening of the heat dissipation cavity 21, completing the heat discharge. At the same time, the external cold air continuously enters the first rotating cavity 61 through the heat dissipation holes 92 on the side wall of the stator base 10 under the action of the air pressure difference, replenishing the air that is drawn out, forming a circulating heat dissipation path of "cold air in - heat absorption - hot air discharge", realizing continuous cooling of the core components inside the motor.

[0030] The direct connection design between the cooling fan 50 and the rotor base 20 eliminates the need for an additional transmission mechanism, enabling synchronous rotation of the fan. This simplifies the structure while ensuring that the speed of the cooling fan 50 matches that of the rotor base 20, allowing the cooling efficiency to adapt to the operating load of the motor. When the motor load increases and the speed rises, the speed of the cooling fan 50 increases synchronously, and the cooling airflow increases accordingly, which can remove more heat in time. Furthermore, the relative arrangement of the guide hole 22 and the fan blade 52, and the connection design between the heat dissipation hole 92 and the first rotating cavity 61, further optimize the smoothness of the airflow channel, reduce airflow resistance, and ensure maximum cooling efficiency.

[0031] The advantages of this utility model are as follows: by directly opening a heat dissipation cavity with an open rear end on the rotor base, the cooling fan is directly set in the heat dissipation cavity and connected to the rotor base. The open rear end design of the heat dissipation cavity provides ample assembly space for the fan. During installation, it is only necessary to put the fan into the heat dissipation cavity and fix it to the rotor base. There is no need to precisely align multiple transmission components inside the motor, which greatly reduces the installation difficulty, shortens the assembly time, and significantly improves the overall production and assembly efficiency of the motor.

[0032] Of course, this utility model is not limited to the above-described embodiments. Those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of this utility model. All such equivalent modifications and substitutions are included within the scope defined by the claims of this application.

Claims

1. A brushless motor, characterized in that: It includes a stator base (10), stator windings, a rotor base (20), rotor windings (30), a motor shaft (40), and a cooling fan (50); The stator base (10) is provided with a first rotating cavity (61); The stator winding is mounted on the inner wall of the stator base (10); The rotor seat (20) is rotatably disposed in the first rotating cavity (61) and has a heat dissipation cavity (21) with an open rear end. The rotor seat (20) has a plurality of guide holes (22) circumferentially disposed therein that communicate with the first rotating cavity (61) and the heat dissipation cavity (21). The rotor winding (30) is mounted on the outer wall of the rotor seat (20) and is arranged opposite to the stator winding; The motor shaft (40) is mounted on the front end of the rotor seat (20); The cooling fan (50) is disposed inside the cooling cavity (21) and connected to the rotor seat (20); The cooling fan (50) can rotate with the rotor base (20) to draw air from the first rotating cavity (61) and the cooling cavity (21) and blow it to the outside.

2. A brushless motor according to claim 1, characterized in that: The stator base (10) includes a sleeve (11), a front cover (12) and a rear cover (13). The front cover (12) is installed at the front end of the sleeve (11), and the rear cover (13) is installed at the rear end of the sleeve (11). The three together form the first rotating cavity (61). The stator winding is installed on the inner wall of the sleeve (11).

3. A brushless motor according to claim 2, characterized in that: A first bearing (71) is provided between the rotor seat (20) and the front cover (12), and a second bearing (72) is provided between the rotor seat (20) and the rear cover (13).

4. A brushless motor according to claim 1, characterized in that: It also includes a pressure cap (14) and a planetary gear assembly (80). The pressure cap (14) is installed at the front end of the stator seat (10). The pressure cap (14) and the stator seat (10) together form a second rotating cavity (62). The motor shaft (40) extends into the second rotating cavity (62). The planetary gear assembly (80) is disposed in the second rotating cavity (62) and mounted on the motor shaft (40).

5. A brushless motor according to claim 4, characterized in that: The planetary gear assembly (80) includes a planet carrier (81), a sun gear (82), and a plurality of planet gears (83). The planet carrier (81) is mounted on the cover (14), the sun gear (82) is mounted on the motor shaft (40), and the planet gears (83) mesh with the planet carrier (81) and the sun gear (82) respectively.

6. A brushless motor according to claim 4, characterized in that: It also includes an end cap (15) and at least one third bearing (73), the end cap (15) being mounted on the front end of the pressure cap (14), the motor shaft (40) extending to the outside of the end cap (15), and the third bearing (73) being connected between the end cap (15) and the motor shaft (40).

7. A brushless motor according to claim 6, characterized in that: The third bearing (73) is configured as two and arranged at axial intervals along the motor shaft (40).

8. A brushless motor according to claim 1, characterized in that: The cooling fan (50) includes a base (51) and a plurality of fan blades (52) evenly distributed around the base (51). One end of the fan blades (52) is connected to the base (51), and the other end is arranged opposite to the guide hole (22).

9. A brushless motor according to claim 1, characterized in that: The cooling fan (50) is connected to the rotor base (20) by a plurality of bolts (91).

10. A brushless motor according to claim 1, characterized in that: The stator base (10) has heat dissipation holes (92) on its side wall that communicate with the outside and the first rotating cavity (61).

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