Brushless motor and food processor

Abstract

The utility model discloses a brushless motor and a food processor. The brushless motor comprises a front cover, a rotor assembly and a stator assembly. The front cover comprises a containing cavity. The rotor assembly is located in the containing cavity and comprises a motor shaft, and the motor shaft is rotationally connected with the front cover. The stator assembly is located in the accommodating cavity, and the stator assembly is fixedly connected with the front cover; the ends, away from the front cover, of the stator assembly and the rotor assembly are exposed. The brushless motor comprises the front cover, the rotor assembly and the stator assembly, and the assembly relation is adopted, and the height of the brushless motor along the axial direction of the motor shaft of the rotor assembly is only determined by the height of the front cover and the height of the stator assembly, so that the axial direction of the brushless motor along the axial direction of the motor shaft of the rotor assembly is determined by the height of the front cover and the height of the stator assembly. The brushless motor is low in height along the axial direction of the motor shaft, light in weight, high in production efficiency and convenient to assemble.

Description

Technical Field

[0001] This application relates to the technical field of small household appliances, and particularly to a brushless motor and a cooking machine. Background Art

[0002] A cooking machine includes a brushless motor, a mixing cup, and a knife assembly. The brushless motor drives the knife assembly to rotate in the mixing cup, so that the ingredients in the mixing cup can be processed.

[0003] However, the existing brushless motor has a relatively high height in the axial direction of the motor shaft. Furthermore, during the operation of the cooking machine, the center of gravity is relatively high and the stability is poor. Summary of the Utility Model

[0004] The purpose of this application is to disclose a brushless motor and a cooking machine. The height of the brushless motor in the axial direction of the motor shaft of the brushless motor is relatively low.

[0005] This application discloses a brushless motor. The brushless motor includes a front cover, a rotor assembly, and a stator assembly. The front cover includes a receiving cavity. The rotor assembly is located in the receiving cavity. The rotor assembly includes a motor shaft, and the motor shaft is rotatably connected to the front cover. The stator assembly is located in the receiving cavity, and the stator assembly is fixed to the front cover; one ends of the stator assembly and the rotor assembly away from the front cover are exposed.

[0006] With the above arrangement, since the brushless motor includes the front cover, the rotor assembly, and the stator assembly, and adopts the foregoing assembly relationship, the height of the brushless motor along the axial direction of the motor shaft of the rotor assembly is only equal to the sum of the height of the front cover and the height of part of the stator assembly, or only equal to the height of the front cover. Therefore, the height of the brushless motor is low; secondly, the brushless motor has fewer components and is light in weight; furthermore, one ends of the stator assembly and the rotor assembly away from the front cover are exposed, and the heat dissipation of the stator assembly and the rotor assembly (such as the stator winding) is unobstructed, and the heat dissipation effect is good; finally, only the stator assembly, the rotor assembly, and the front cover need to be assembled, and the production efficiency is high and the assembly is convenient.

[0007] In some embodiments, the stator assembly surrounds the rotor assembly, or the rotor assembly surrounds the stator assembly.

[0008] With the above arrangement, both of the above two methods can achieve a relatively low height of the brushless motor along the axial direction of the motor shaft. In comparison, when the stator assembly surrounds the rotor assembly, the corresponding diameter of the rotor assembly can be relatively small, and the moment of inertia is small. Therefore, during the rotation process, it is not easy to swing, and the brushless motor works more stably.

[0009] In some embodiments, the front cover includes a bearing receiving cavity communicating with the receiving cavity; the brushless motor includes a bearing assembly, and the bearing assembly includes a first bearing and a second bearing fixed in the bearing receiving cavity. The motor shaft is rotatably inserted through the first bearing and the second bearing of the bearing assembly, and the motor shaft also passes out of the front cover.

[0010] With the above arrangement, by fixing the first bearing and the second bearing in the bearing receiving cavity, the rotor assembly is axially limited, and the concentricity of the motor shaft can be improved, which is beneficial to avoiding the swing of the rotor assembly during rotation and the movement in the axial direction. In addition, when the first bearing and the second bearing are fixed in the bearing receiving cavity, it is convenient to assemble the rotor assembly with the front cover.

[0011] In some embodiments, the rotor assembly includes a rotor body, a first fixing member and a second fixing member, and the motor shaft is integrally connected with the rotor body; along the axial direction of the motor shaft, the first bearing and the second bearing are arranged at intervals in the axial direction of the motor shaft. The first fixing member is fixed to the motor shaft and abuts against the first bearing of the bearing assembly, and the second fixing member is fixed to the motor shaft and abuts against the second bearing of the bearing assembly.

[0012] With the above arrangement, the rotor assembly is circumferentially limited by the first bearing and the second bearing of the bearing assembly. In addition, in the axial direction of the motor shaft, since the first fixing member is fixed to the motor shaft and abuts against the first bearing of the bearing assembly, and the second fixing member is fixed to the motor shaft and abuts against the second bearing of the bearing assembly, and the first bearing and the second bearing are arranged at intervals in the axial direction of the motor shaft, in this way, the rotor assembly is limited both circumferentially and axially, avoiding the swing of the rotor assembly during rotation and the movement in the axial direction; in addition, through the above relationship, it can be understood that the rotor assembly is assembled with the bearing assembly to complete the assembly of the rotor assembly with the front cover, and the assembly of the rotor assembly is simple and the production efficiency is high.

[0013] In some embodiments, the bearing assembly includes a bearing limit sleeve and a bearing snap ring; the bearing limit sleeve is located in the bearing receiving cavity. The first bearing and the second bearing are located at both ends of the bearing limit sleeve. The bearing snap ring is clamped with the cavity wall of the bearing receiving cavity to fix the first bearing, the second bearing and the bearing limit sleeve in the bearing receiving cavity.

[0014] With the above settings, on the one hand, only the bearing receiving cavity needs to be machined, ensuring fewer parts to be machined and reducing machining errors. On the other hand, with the first bearing, the second bearing, and the bearing limit sleeve all located within the bearing receiving cavity, there are fewer assembly processes and less assembly error, resulting in a high concentricity of the motor shaft. Finally, the structure of the bearing assembly is simple, the bearing assembly is convenient to assemble itself, and it is also convenient for the motor shaft of the rotor assembly to be rotatably connected to the front cover through the bearing assembly.

[0015] In some embodiments, the stator assembly includes a stator core and a stator winding located within the stator core; an axial limiting mechanism is provided between the stator core and the cavity wall of the receiving cavity, and the axial limiting mechanism limits the stator assembly axially with respect to the motor shaft of the rotor assembly. A circumferential limiting mechanism is provided between the stator core and the cavity wall, and the circumferential limiting mechanism limits the stator assembly circumferentially with respect to the brushless motor.

[0016] With the above settings, the stator assembly is limited axially by the axial limiting mechanism with respect to the motor shaft, and is limited circumferentially by the circumferential limiting mechanism with respect to the brushless motor. Thus, during the operation of the brushless motor, the stator assembly does not move either circumferentially or axially, avoiding contact between the front cover and the coil winding of the stator assembly, which may cause damage to the stator assembly, etc.

[0017] In some embodiments, the circumferential limiting mechanism includes a limiting groove provided in one of the stator core and the cavity wall, and a limiting protrusion provided in the other, with the limiting protrusion located within the limiting groove.

[0018] With the above settings, the circumferential limiting mechanism includes the limiting protrusion and the limiting groove. The structure of the circumferential limiting mechanism is simple, and the assembly between the stator assembly and the front cover is also simple and convenient, with high production efficiency.

[0019] In some embodiments, the axial limiting mechanism is a step provided on the cavity wall, and the stator core abuts against the step.

[0020] With the above settings, since the axial limiting mechanism is a step and the stator core abuts against the step, the axial positioning is simple, and correspondingly, the structure of the front cover is also simple. In addition, after inserting the stator assembly into the receiving cavity, the stator core can abut against the step, and the assembly of the stator assembly and the front cover is simple, with high production efficiency.

[0021] In some embodiments, both the limiting groove and the limiting protrusion extend along the axial direction of the motor shaft, and the limiting groove is a notch formed in the cavity wall.

[0022] With the above settings, since both the limiting groove and the limiting protrusion extend along the axial direction of the motor shaft, and the limiting groove is a notch, along the axial direction, inserting the stator assembly into the accommodating cavity can make the limiting protrusion located in the limiting groove to achieve circumferential limitation. Thus, not only the positioning function is realized, but also the assembly of the stator assembly is convenient, simple, and the production efficiency is high.

[0023] In some embodiments, the stator core is in interference fit with the cavity wall.

[0024] With the above settings, through the interference fit, the loosening of the stator assembly is avoided, for example, falling out of the accommodating cavity. Moreover, through the interference fit, the assembly of the stator assembly and the front cover is also simple, and the production efficiency is high. For example, compared with the figure, at least the step of screw assembly can be omitted and the production efficiency is high.

[0025] In some embodiments, the front cover includes a rear end of the front cover; the rear end of the front cover includes a limiting portion extending towards the inner side of the front cover, and the limiting portion is circumferentially distributed on the front cover and abuts against the stator assembly to limit the axial movement of the stator assembly on the motor shaft of the rotor assembly.

[0026] With the above settings, by restricting the axial movement of the stator assembly on the motor shaft through the limiting portion, the stator assembly can be prevented from falling out and the axial loosening of the stator assembly on the motor shaft can also be avoided.

[0027] In a second aspect, the present application discloses a cooking machine. The cooking machine includes any one of the above brushless motors, a mixing cup, and a knife assembly. The motor shaft of the brushless motor is directly connected to the knife assembly to drive the knife assembly to rotate in the mixing cup.

[0028] With the above settings, since the cooking machine includes any one of the above brushless motors, and because the axial height of the brushless motor is low, in this way, the proportion of the height of the brushless motor in the height of the cup base is increased, which is beneficial to reducing the center of gravity of the cup base and improving the stability of the mixing cup. In addition, it is also beneficial to reduce the overall height of the machine, facilitating storage or handling.

[0029] In some embodiments, the front cover includes a connection head through which the motor shaft passes; in the case where the motor shaft is directly connected to the knife assembly, the connection head is threadedly or snap-connected to the bottom of the mixing cup.

[0030] With the above settings, the brushless motor can be conveniently assembled to the bottom of the mixing cup.

[0031] In a third aspect, the present application discloses a cooking machine. The cooking machine includes a main body and a mixing cup assembly. The mixing cup assembly includes a mixing cup and a knife assembly; the main body includes any one of the aforementioned brushless motors; when the mixing cup assembly is assembled to the main body, the brushless motor drives the knife assembly to rotate in the mixing cup.

[0032] With the above arrangement, since the cooking machine includes any one of the aforementioned brushless motors, and the axial height of the brushless motor on the motor shaft is low, thus, the proportion of the height of the brushless motor in the height of the main body is increased, which is beneficial to reducing the center of gravity of the main body and improving the stability of the main body. In addition, the main body is thinner and lighter.

[0033] In some embodiments, the front cover includes a connection head through which the motor shaft passes, and the connection head is threadedly or snap-connected to the main body.

[0034] With the above arrangement, the brushless motor can be conveniently assembled to the main body. Description of the Drawings

[0035] Figure 1 is a perspective view of the first brushless motor of the present application;

[0036] Figure 2 is an exploded view of the first brushless motor of the present application;

[0037] Figure 3 is Figure 1 a cross-sectional view of the shown brushless motor;

[0038] Figure 4 is Figure 3 a schematic diagram without the stator assembly;

[0039] Figure 5 is a cross-sectional view of the front cover of the first brushless motor of the present application;

[0040] Figure 6 is a perspective view of the front cover of the first brushless motor of the present application at one angle;

[0041] Figure 7 is a perspective view of the front cover of the first brushless motor of the present application at another angle;

[0042] Figure 8 is a cross-sectional view of the second brushless motor of the present application;

[0043] Figure 9 is a cross-sectional view of the front cover of the second brushless motor of the present application;

[0044] Figure 10 is a cross-sectional view of the first cooking machine of the present application, and the first cooking machine includes the first brushless motor;

[0045] Figure 11 is a cross-sectional view of the second food processor of the present application. The second food processor includes the first brushless motor mentioned above;

[0046] Figure 12 is an exploded view of a brushless motor in the related art;

[0047] Figure 13 is a cross-sectional view of the first food processor in the related art. The first food processor includes Figure 12 the brushless motor shown above;

[0048] Figure 14 is a cross-sectional view of the second food processor in the related art. The second food processor includes Figure 12 the brushless motor shown above. Detailed Embodiments

[0049] Here, the technical solutions in the embodiments (or "embodiment modes") of the present application will be clearly and completely described in conjunction with the accompanying drawings. When the following description involves the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0050] If there are terms related to directional indications or positional relationships in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and movement conditions between components in a specific posture (as shown in the accompanying drawings); if this specific posture changes, then the directional indication or positional relationship will also change accordingly. In addition, the terms "first", "second", etc. involved in the embodiments of the present application are only for the purpose of convenient description and cannot be understood as indicating or implying relative importance.

[0051] Figure 1 、 Figure 2 and Figure 3 schematically show the first brushless motor 10, Figure 9 schematically show the second brushless motor 10. Both of the two brushless motors 10 include a front cover 1, a rotor assembly 2, and a stator assembly 3. Further combined with Figure 4 、 Figure 5 、 Figure 7 and Figure 8 the front cover 1 includes a receiving cavity 11. The rotor assembly 2 is located in the receiving cavity 11. The rotor assembly 2 includes a motor shaft 21. The motor shaft 21 is rotatably connected to the front cover 1. The rotatable connection is not limited to the embodiment mode described in the present application.

[0052] In Figure 3 and Figure 1The first brushless motor 10 shown, and Figure 9 In the second brushless motor 10 shown, the stator assembly 3 is located in the accommodation cavity 11 and is fixed to the front cover 1. Being located in the accommodation cavity 11, as shown in the figure, both the stator assembly 3 and the rotor assembly 2 are partially located in the accommodation cavity 11, resulting in a distance a > 0 as shown in the figure; or the stator assembly 3 and the rotor assembly 2 can be completely located in the accommodation cavity 11, that is, a ≤ 0. There is no limit to how the stator assembly 3 is fixed, as long as the stator assembly 3 and the front cover 1 do not move relative to each other during the operation of the brushless motor. One end of the stator assembly 3 and the rotor assembly 2 away from the front cover 1 is exposed. More specifically, refer to Figure 1 and combine with Figure 3 and Figure 9 , the stator assembly 3 and the rotor assembly 2 are exposed from the accommodation cavity 11. Figure 3 and Figure 9 Schematically show the exposed distance as a. However, based on the beneficial effect that the subsequent stator assembly 3 and rotor assembly 2 are exposed for heat dissipation, the exposure also includes the case where a ≤ 0 (that is, the end face of the stator assembly 3 is flush with the opening of the accommodation cavity 11, or even the stator assembly 3 is located in the accommodation cavity 11). In short, as long as the stator assembly 3 and the rotor assembly 2 can have part exposed to the outside through the accommodation cavity 11 for heat dissipation. Those skilled in the art can understand that based on the function of heat dissipation due to exposure, one end of the stator assembly 3 and the rotor assembly 2 away from the front cover 1 is exposed from the accommodation cavity 11 to dissipate heat to the outside of the brushless motor 10.

[0053] With the above settings, since the brushless motor 10 includes the front cover 1, the rotor assembly 2, and the stator assembly 3, the rotor assembly 2 is located in the accommodation cavity 11, the motor shaft 21 of the rotor assembly 2 is rotatably connected to the front cover 1, the stator assembly 3 is fixed to the front cover 1, and one end of the stator assembly 3 and the rotor assembly 2 away from the front cover 1 is exposed. Thus, the height of the brushless motor 10 is determined by the height of the front cover 1 and the height of the stator assembly. For example, in the case where the stator assembly 3 is partially located in the accommodation cavity 11 of the front cover 1 as shown in Figure 3 , the height h1 of the brushless motor 10 along the axial direction of the motor shaft 21 of the rotor assembly 2 is h1 = a + b, where a is the height of the stator assembly 3 exposed outside the brushless motor 10, and b is the height of the front cover. As for Figure 3 the heights c and d in Figure 3It is mainly the height by which the rear end plate 222 of the rotor of the rotor assembly 2 protrudes. On the one hand, this part of the height c can be adjusted. For example, it can be made flush with the stator assembly 3. On the other hand, the stator assembly 3 and the rotor assembly need to satisfy a positional relationship to enable the rotation of the rotor assembly 2. Therefore, the rotor assembly 2 cannot protrude too much either, and c will not be too large. Thus, due to the above two reasons, the influence of the height c can be disregarded. For the height d, this part is for connecting the clutch, and this part of the height can be adjusted. Therefore, when determining the height of the brushless motor, this part of the height d is not considered. Also, for example, when the stator assembly 3 is completely located in the accommodation cavity 11 of the front cover 1, the height of the brushless motor 10 is equal to the height of the front cover 1. Therefore, the brushless motor 10 has a low height. For example, compared with Figure 12 the related art shown, it is not determined by the respective heights of the front motor bracket 91, the rotor assembly 2, the stator assembly 3, the rear motor bracket 92, and the fan blade 93.

[0054] Secondly, only considering the number of components, the brushless motor has fewer components. For example, compared with Figure 12 the related art shown, since the stator assembly 3 is fixed to the front cover 1, and the ends of the stator assembly 3 and the rotor assembly 2 away from the front cover 1 are exposed, there is no longer a need for the rear motor bracket 92 and the front motor bracket 91 to clamp the stator assembly 3 with screws 94. Therefore, considering the connection of the stator assembly 3 to other components, at least the rear motor bracket 92 can be omitted. The brushless motor 10 is lighter in weight and also lower in axial height.

[0055] Furthermore, the ends of the stator assembly 3 and the rotor assembly 2 away from the front cover 1 are exposed, and the heat dissipation of the stator assembly 3 and the rotor assembly 2 (such as the stator winding) is unobstructed. On the one hand, the heat dissipation effect is good. On the other hand, the fan blade can be omitted, making the structure of the brushless motor simple, and the axial height of the brushless motor is low. For example, compared with Figure 12 the brushless motor shown, the fan blade 93 can be omitted while ensuring good heat dissipation. In addition, in the present application, the stator assembly 3 and the rotor assembly 2 are partially exposed outside the front cover 1. Compared with the stator assembly 3 and the rotor assembly 2 being entirely located in the accommodation cavity 11 of the front cover 1, the brushless motor 10 is lighter in weight, has more exposed parts, and better heat dissipation effect.

[0056] Finally, when assembling the stator assembly 3, the rotor assembly 2, and the front cover 1, the production efficiency is high and the assembly is convenient. For example, compared with Figure 12 the related art shown, since at least the step of assembling the rear motor bracket 92 can be omitted (in some embodiments, since the fan blade 93 is not needed, the step of assembling the fan blade 93 can also be omitted), the production efficiency is high and the assembly is convenient.

[0057] In Figure 1 、 Figure 3and Figure 9 In the brushless motor 10 shown, the stator assembly 3 surrounds the rotor assembly 2. As a variation of this embodiment, it is also possible that the rotor assembly 2 surrounds the stator assembly 3. Regardless of the design, since the stator assembly 3 does not move during the operation of the motor, in both cases, the stator assembly 3 is fixed to the front cover 1.

[0058] With the above settings, both of the above two methods can achieve a relatively low height of the brushless motor 10 along the axial direction of the motor shaft. Comparing the two, when the stator assembly 3 surrounds the rotor assembly 2, the corresponding diameter of the rotor assembly 2 can be relatively small, and the moment of inertia is small. Therefore, it is not easy to swing during rotation, and the brushless motor 10 operates more smoothly.

[0059] See Figure 7 and Figure 8 , the front cover 1 includes a bearing receiving cavity 12. Combining with Figure 3 , Figure 4 and Figure 9 , the brushless motor 10 includes a bearing assembly 4, and the bearing assembly 4 is fixed in the bearing receiving cavity 12. In the present application, the bearing assembly 4 includes a first bearing 41 and a second bearing 42. The first bearing 41 and the second bearing 42 are fixed in the bearing receiving cavity 12. There is no limitation on how the first bearing 41 and the second bearing 42 are fixed. The first bearing 41 and the second bearing 42 can be stacked and fixed, or can be spaced and fixed. The spaced arrangement is not limited to the embodiment such as through a bearing circlip later. For example, the bottom of the bearing receiving cavity 12 has a surrounding rib, the bearing assembly includes a bearing limiting sleeve, the second bearing 42 is located between the bottom end of the bearing limiting sleeve 43 and the surrounding rib, and the first bearing 41 is located at the top end of the bearing limiting sleeve 43 and can be fixed by a fixing member (such as a circlip). For another example, the cavity wall of the bearing receiving cavity has an upper step and a lower step. The first bearing 41 is located between the first fixing member and the upper step, and the second bearing 42 is located between the second fixing member and the lower step. The motor shaft 21 is rotatably passed through the first bearing 41 and the second bearing 42 of the bearing assembly 4, and the motor shaft 21 also passes out of the front cover 1.

[0060] With the above settings, by fixing the first bearing 41 and the second bearing 42 in the bearing receiving cavity 12, the rotor assembly 2 is axially limited, and the concentricity of the motor shaft 21 can be improved, which is beneficial to avoiding the swing of the rotor assembly 2 during rotation and the movement in the axial direction. In addition, when the first bearing 41 and the second bearing 42 are fixed in the bearing receiving cavity, it is convenient for the assembly of the rotor assembly and the front cover.

[0061] See Figure 7 and Figure 8, the bearing assembly 4 includes a bearing limit sleeve 43 and a bearing circlip 44. The bearing limit sleeve 43 is located within the bearing receiving cavity 12. The first bearing 41 and the second bearing 42 are located at both ends of the bearing limit sleeve 43. Among them, the first bearing 41 abuts against the top wall of the bearing receiving cavity 12, and the bearing circlip 44 is clamped with the cavity wall of the bearing receiving cavity 12. Thus, the second bearing 42 is clamped tightly by the bearing circlip 44. Through the above assembly relationship, the bearing assembly 4 is fixed within the bearing receiving cavity 12.

[0062] With the above arrangement, on the one hand, only the bearing receiving cavity 12 needs to be machined, ensuring fewer parts to be processed and reducing machining errors. On the other hand, since the first bearing, the second bearing, and the bearing limit sleeve are all located within the bearing receiving cavity 12, there are fewer assembly processes and less assembly error, and finally the concentricity of the motor shaft is high. For example, compared with Figure 12 and Figure 13 the brushless motor shown, it is necessary to machine a receiving groove on the front motor bracket 91 to place the first bearing 41, and machine a receiving groove on the rear motor bracket 92 to place the second bearing. In this way, after machining the two receiving grooves, there are machining errors between these two receiving grooves compared with only machining the bearing receiving cavity 12; the first bearing 41 is sandwiched between the stator assembly 3 and the front motor bracket 91, and the second bearing 42 is sandwiched between the rear end of the stator assembly 3 and the rear motor bracket 92. Thus, there are two assembly locations and assembly errors. Therefore, the assembly error and machining error of the present application are both low, ensuring the concentricity of the motor shaft. Finally, the structure of the bearing assembly is simple, the bearing assembly is convenient for self-assembly, and it is also convenient for the motor shaft of the rotor assembly to be rotatably connected to the front cover through the bearing assembly. Of course, based on the function of the bearing assembly 4, the structure of the bearing assembly 4 is not limited to this.

[0063] Refer to Figure 3 、 Figure 4 and Figure 9 and in combination with Figure 2 , the rotor assembly 2 includes a motor shaft 21, a rotor main body 22, a first fixing member 23, and a second fixing member 24. The rotor main body 22 includes a rotor front end plate 221, a rotor rear end plate 222, and a rotor iron core 223. The rotor front end plate 221 and the rotor rear end plate 222 are respectively located at the front end and the rear end of the rotor iron core 223.

[0064] Refer to Figure 3 、 Figure 4 and Figure 9, the motor shaft 21 is integrally connected to the rotor body 22, and there is no limit on how they are integrally connected, as long as the two can rotate synchronously. The motor shaft 21 is rotatably passed through the bearing assembly 4 and passes out of the front cover 1. Along the axial direction of the motor shaft 21, the first bearing 41 and the second bearing 42 are arranged at intervals. The first fixing member 23 is fixed to the motor shaft 21 and also abuts against the first bearing 41 of the bearing assembly 4. The second fixing member 24 is fixed to the motor shaft and also abuts against the second bearing 42 of the bearing assembly 4. The second fixing member 24 can be an independent component as shown in the figure. In some embodiments, the second fixing member 24 can also be integrally formed with the front cover 1 and can be located at the bottom of the bearing receiving cavity 12.

[0065] With the above arrangement, the rotor assembly 2 is circumferentially limited by the bearing assembly 4. In addition, in the axial direction of the motor shaft 21, since the first fixing member 23 is fixed to the motor shaft 21 and also abuts against the first bearing 41 of the bearing assembly 4, and the second fixing member 24 is fixed to the motor shaft 21 and also abuts against the second bearing 42 of the bearing assembly 4, it is limited. Moreover, since the first bearing 41 and the second bearing 42 are arranged at intervals in the axial direction of the motor shaft 21, in this way, the rotor assembly 2 is limited both circumferentially and axially, avoiding the swing of the rotor assembly 2 during rotation and the movement in the axial direction. In addition, through the above relationship, it can be understood that the rotor assembly 2 and the bearing assembly 4 are assembled to complete the assembly of the rotor assembly 2 and the front cover 1. The assembly of the rotor assembly 2 is simple and the production efficiency is high.

[0066] See Figure 3 and Figure 9 , the stator assembly 3 includes a stator core 31 and a stator winding 32 located inside the stator core 31. In this application, the stator winding 32 includes a coil winding 321 and a stator support 322. The coil winding 321 is wound around the stator support 322. See Figure 5 , Figure 7 , Figure 8 and in combination with Figure 3 and Figure 9 , an axial limiting mechanism 33 is provided between the stator core 31 and the cavity wall of the receiving cavity 11, and the axial limiting mechanism 33 limits the stator assembly 3 in the axial direction of the motor shaft 21. See Figure 1 and Figure 2 , a circumferential limiting mechanism 34 is provided between the stator core 31 and the cavity wall of the receiving cavity 11, and the circumferential limiting mechanism 34 limits the stator assembly 3 in the circumferential direction of the brushless motor.

[0067] With the above settings, the stator assembly 3 is axially limited by the axial limiting mechanism 33 on the motor shaft 21, and the stator assembly 3 is circumferentially limited by the circumferential limiting mechanism 34 in the circumferential direction of the brushless motor 10. Thus, during the operation of the brushless motor, the stator assembly 3 does not move either circumferentially or axially, preventing the front cover 1 from contacting the coil winding 321 of the stator assembly 3 and causing damage to the stator assembly 3 (such as the coil winding 321), etc.

[0068] In some embodiments, the circumferential limiting mechanism 34 includes a limiting protrusion 341 and a limiting groove 342. Refer to Figure 1 and Figure 2 , the limiting protrusion 341 is provided on the stator core 31. Refer to Figure 6 、 Figure 7 and Figure 8 and in combination with Figure 2 , the limiting groove 342 is provided on the wall of the receiving cavity 11. Of course, in another embodiment, it may also be that the stator core 31 is provided with the limiting groove 342 and the wall is provided with the limiting protrusion 341. Regardless of how the limiting groove 342 and the limiting protrusion 341 are arranged, as Figure 1 shown, the limiting protrusion 341 is located within the limiting groove 342.

[0069] With the above settings, the circumferential limiting mechanism 34 includes the limiting protrusion 341 and the limiting groove 342. The structure of the circumferential limiting mechanism 34 is simple, and the assembly between the stator assembly 3 and the front cover 1 is also simple, convenient, and has high production efficiency.

[0070] Continuing to refer to Figure 1 and Figure 2 and in combination with Figure 6 、 Figure 7 and Figure 8 , both the limiting groove 342 and the limiting protrusion 341 extend along the axial direction of the motor shaft 21, and moreover, the limiting groove 342 is a notch formed on the wall.

[0071] With the above settings, since both the limiting groove 342 and the limiting protrusion 341 extend along the axial direction of the motor shaft 21 and the limiting groove 342 is a notch, along the axial direction, inserting the stator assembly 3 into the receiving cavity 11 can make the limiting protrusion 341 located within the limiting groove 342 to achieve circumferential limitation. Thus, not only the positioning function is achieved, but also the assembly of the stator assembly 3 is convenient, simple, and has high production efficiency.

[0072] Refer to Figure 5 、 Figure 7 and Figure 8 and in combination with Figure 3 and Figure 9 , the axial limiting mechanism 33 is a step provided on the wall. Refer toFigure 3 and Figure 9 The stator core 31 abuts against the step to achieve the axial limit.

[0073] With the above arrangement, since the axial limiting mechanism 33 is a step and the stator core 31 abuts against the step, in this way, the realization of the axial positioning is simple, and correspondingly, the structure of the front cover 1 is also simple. In addition, after the stator assembly 3 is inserted into the accommodation cavity 11, the stator core 31 can abut against the step, and the assembly of the stator assembly 3 and the front cover 1 is simple, with high production efficiency.

[0074] See Figure 3 and in combination with Figure 1 the stator core 31 is in interference fit with the cavity wall of the accommodation cavity 11.

[0075] With the above arrangement, through the interference fit, the loosening of the stator assembly 3 is avoided, for example, falling out of the accommodation cavity 11. Moreover, through the interference fit, the assembly of the stator assembly 3 and the front cover 1 is also simple, with high production efficiency. For example, Figure 12 for the brushless motor shown, screws 94 need to pass through the rear motor bracket 92, the mounting groove 310 of the stator assembly 3 and the front motor bracket 91 to lock the stator assembly 3 between the front motor bracket 91 and the rear motor bracket 92. The assembly between the stator assembly 3 and the front cover 1 in the present application is compared with Figure 12 the assembly method shown, without the need to lock with screws 94. Therefore, the assembly is simple, convenient, and has high production efficiency.

[0076] See Figure 8 The front cover 1 includes a front cover rear end 13. The front cover rear end 13 includes a limiting portion 131 extending towards the inner side of the front cover 1. The limiting portion 131 is circumferentially distributed on the front cover 1. See Figure 9 The limiting portion 131 abuts against the stator assembly 3 to limit the axial movement of the stator assembly 3 on the motor shaft 21 of the rotor assembly 2. Based on the function realized by the connection between the limiting portion 131 and the stator assembly 3, there is no limit to how they are connected. For example, as shown in the present application, the limiting portion 131 extends along the axial direction of the motor shaft 21, and the limiting portion 131 is bent from the axial direction to the radial direction by pressing to abut against the stator assembly 3. In some other embodiments, the connection can also be a fixed connection such as welding. In short, no matter which connection, as long as the stator assembly 3 will not fall off and the stator assembly 3 will not move axially on the motor shaft 21.

[0077] With the above settings, the axial movement of the stator assembly 3 on the motor shaft 21 is restricted by the limiting portion 131, which can prevent the stator assembly 3 from falling out and also prevent the stator assembly 3 from loosening axially on the motor shaft 21. In addition, the stator assembly 3 can be assembled with the front cover 1 through the limiting portion 131, which also makes the assembly of the stator assembly 3 and the front cover 1 simple, convenient and highly efficient. For example, only the limiting portion 131 needs to be bent, instead of Figure 12 the brushless motor 10 shown in the figure, where screws 94 need to pass through the rear motor bracket 92, the mounting groove 310 of the stator assembly 3 and the front motor bracket 91 to lock the stator assembly 3 between the front motor bracket 91 and the rear motor bracket 92. The locking of the screws 94 makes the assembly troublesome, inconvenient and inefficient.

[0078] In some embodiments, the limiting portion 131 can replace the interference fit between the stator assembly 3 and the cavity wall of the receiving cavity 11. However, in other embodiments, the stator assembly 3 not only has an interference fit with the cavity wall of the receiving cavity 11 of the front cover 1, but is also limited by the limiting portion 131. In addition, the limiting portion 131 can also be combined with the step. That is, the front end of the stator core of the stator assembly 3 abuts against the step, and the rear end (the exposed end) is limited by the limiting portion 131. Thus, the stator assembly 3 is further limited by the combination of the step and the limiting portion.

[0079] In a second aspect, referring to Figure 10 , the present application discloses a food processor. The food processor includes any one of the foregoing brushless motors 10, a mixing cup 20 and a knife assembly 30. The motor shaft 21 of the brushless motor 10 is directly connected to the knife assembly 30 to drive the knife assembly 30 to rotate in the mixing cup 20. That is, Figure 10 the food processor shown in the figure is a direct-drive food processor.

[0080] With the above settings, since the food processor includes any one of the foregoing brushless motors 10, and the axial height of the brushless motor 10 on the motor shaft 21 is low, the ratio of the height h1 of the brushless motor 10 in the height h2 of the cup holder is increased, which is beneficial to reducing the center of gravity of the cup holder and improving the stability of the mixing cup 20. In addition, it is also beneficial to reduce the overall height of the machine, facilitating storage or carrying. More specifically, in Figure 13 , the height h1 of the brushless motor and the height h2 of the cup holder satisfy: h1 / h2 = 0.69. For example, h1 = 45 mm and h2 = 65 mm. After adopting the brushless motor 10 of the present application, as shown in Figure 10As shown, the height h1 of the brushless motor is 36 mm, the height h2 of the cup holder is 49 mm, h1 / h2 = 0.73. The ratio h1 / h2 of the height of the brushless motor 10 to the height of the cup holder is increased from 0.69 to 0.73. The increase in the proportion of the height of the brushless motor 10 in the height of the cup holder is beneficial to reducing the center of gravity of the cup holder and improving the stability of the mixing cup 20.

[0081] In a further embodiment, refer to 5, Figure 6 and Figure 9 , the front cover 1 includes a connection head 14 through which the motor shaft 21 passes. In this embodiment, the bearing receiving cavity 12 is formed inside the connection head 14. Refer to Figure 10 and in combination with Figure 9 , the connection head 14 is provided with threads to thread the bottom of the mixing cup (the bottom is the cutter head in this embodiment) through the threads. In some other embodiments, the connection head 14 can also be snap-connected to the bottom of the mixing cup.

[0082] With the above settings, the brushless motor can be conveniently assembled to the bottom of the mixing cup.

[0083] Refer to Figure 12 and Figure 14 , this application also discloses another food processor. The mixing cup assembly and the main body of this food processor are separable. Specifically, the food processor includes a main body 100 and a mixing cup assembly 200. The mixing cup assembly 200 includes a mixing cup 20 and a cutter assembly 30. The main body 100 includes any one of the aforementioned brushless motors 10. When the mixing cup assembly 200 is assembled to the main body 100, the brushless motor 10 drives the cutter assembly 30 to rotate in the mixing cup 20.

[0084] With the above settings, since the food processor includes any one of the aforementioned brushless motors 10, and because the axial height of the brushless motor 10 on the motor shaft 21 is low, in this way, the proportion of the height h1 of the brushless motor 10 in the height h3 of the main body is increased, which is beneficial to reducing the center of gravity of the main body 100 and improving the stability of the main body 100. In addition, the main body 100 is thinner and lighter. More specifically, in Figure 14 , the height h1 of the brushless motor and the height h3 of the main body satisfy: h1 / h3 = 0.49. For example, the height h1 of the brushless motor 10 is 45 mm; the height h3 of the main body is 92 mm. After adopting the brushless motor 10 of this application, as Figure 11As shown, the height h1 of the brushless motor 10 is 36 mm, and the height h3 of the main body is 64 mm. Therefore, the ratio h1 / h3 of the height h1 of the brushless motor 10 to the height h3 of the main body 100 is increased from 0.49 to 0.56 (the recommended range is 0.5 - 1.0, preferably 0.56), thereby improving the stability of the main body 100. The height of the brushless motor 10 is reduced by 9 mm, and the overall height of the machine is reduced by 28 mm, making the main body 100 thinner and lighter.

[0085] In some embodiments, the front cover 1 includes a connector 14 through which the motor shaft 21 passes. Refer to Figure 11 and in combination with Figure 9 , the connector 14 is threaded with the main body 100. Of course, it is also possible that the connector 14 is snap - connected to the main body 100.

[0086] With the above - described arrangement, the brushless motor can be conveniently assembled to the main body.

[0087] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the scope of protection of this application.

Claims

1. A brushless motor, characterized in that, The brushless motor includes a front cover (1), a rotor assembly (2) and a stator assembly (3), wherein: The front cover (1) includes a receiving cavity (11); The rotor assembly (2) is located in the receiving cavity (11). The rotor assembly (2) includes a motor shaft (21), and the motor shaft (21) is rotatably connected to the front cover (1); The stator assembly (3) is located in the receiving cavity (11), and the stator assembly (3) is fixed to the front cover (1); one end of the stator assembly (3) and the rotor assembly (2) away from the front cover (1) is exposed.

2. The brushless motor according to claim 1, wherein, The front cover (1) includes a bearing receiving cavity (12) communicating with the receiving cavity (11); the brushless motor includes a bearing assembly (4), and the bearing assembly (4) includes a first bearing (41) and a second bearing (42) fixed in the bearing receiving cavity (12); The motor shaft (21) is rotatably passed through the first bearing (41) and the second bearing (42) of the bearing assembly (4), and the motor shaft (21) also passes out of the front cover (1).

3. The brushless motor according to claim 2, wherein The rotor assembly (2) includes a rotor body (22), a first fixing member (23) and a second fixing member (24); the motor shaft (21) is integrally connected with the rotor body (22); Along the axial direction of the motor shaft (21), the first bearing (41) and the second bearing (42) are arranged at intervals. The first fixing member (23) is fixed to the motor shaft (21) and abuts against the first bearing (41) of the bearing assembly (4). The second fixing member (24) is fixed to the motor shaft (21) and abuts against the second bearing (42) of the bearing assembly (4); And / or, the bearing assembly (4) includes a bearing limit sleeve (43) and a bearing circlip (44). The bearing limit sleeve (43) is located in the bearing receiving cavity (12); the first bearing (41) and the second bearing (42) are located at both ends of the bearing limit sleeve (43); the bearing circlip (44) is clamped with the cavity wall of the bearing receiving cavity (12) to fix the first bearing (41), the second bearing (42) and the bearing limit sleeve (43) in the bearing receiving cavity (12).

4. The brushless motor according to claim 1 or 2, characterized in that, The stator assembly (3) surrounds the rotor assembly (2), or the rotor assembly (2) surrounds the stator assembly (3).

5. The brushless motor according to claim 1, wherein The stator assembly (3) includes a stator core (31) and a stator winding (32) located in the stator core (31); an axial limiting mechanism (33) is arranged between the stator core (31) and the cavity wall of the receiving cavity (11), and the axial limiting mechanism (33) limits the stator assembly (3) in the axial direction of the motor shaft (21) of the rotor assembly (2); A circumferential limiting mechanism (34) is arranged between the stator core (31) and the cavity wall of the receiving cavity (11), and the circumferential limiting mechanism (34) limits the stator assembly (3) in the circumferential direction of the brushless motor (10).

6. The brushless motor according to claim 5, characterized in that, The circumferential limiting mechanism (34) includes a limiting groove (342) provided in one of the stator core (31) and the cavity wall, and a limiting protrusion (341) provided in the other. The limiting protrusion (341) is located within the limiting groove (342); And / or, the axial limiting mechanism (33) is a step provided on the cavity wall, and the stator core (31) abuts against the step.

7. The brushless motor according to claim 6, wherein, Both the limiting groove (342) and the limiting protrusion (341) extend along the axial direction of the motor shaft (21), and the limiting groove (342) is a notch formed in the cavity wall.

8. The brushless motor according to claim 5, wherein The stator core (31) is in interference fit with the cavity wall; And / or, the front cover (1) includes a rear end (13) of the front cover; the rear end (13) of the front cover includes a limiting portion (131) extending towards the inner side of the front cover (1); the limiting portions (131) are circumferentially distributed on the front cover (1) and abut against the stator assembly (3) to limit the axial movement of the stator assembly (3) on the motor shaft (21) of the rotor assembly.

9. A cooking machine, characterized in that, The cooking machine includes the brushless motor (10), the mixing cup (20), and the cutter assembly (30) according to any one of claims 1 to 8. The motor shaft (21) of the brushless motor (10) is directly connected to the cutter assembly (30) to drive the cutter assembly (30) to rotate within the mixing cup (20); Alternatively, the cooking machine includes a main body (100) and a mixing cup assembly (200). The mixing cup assembly (200) includes a mixing cup (20) and a cutter assembly (30); the main body (100) includes the brushless motor (10) according to any one of claims 1 to 8; when the mixing cup assembly (200) is assembled to the main body (100), the brushless motor (10) drives the cutter assembly (30) to rotate within the mixing cup (20).

10. The cooking machine according to claim 9, characterized in that The front cover (1) includes a connector (14) through which the motor shaft (21) passes out; when the motor shaft (21) is directly connected to the cutter assembly (30), the connector (14) is threadedly or snap-connected to the bottom of the mixing cup (20); When the main body (100) includes the brushless motor (10), the connector (14) is threadedly or snap-connected to the main body (100).

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