Brushless motor and food processor

Abstract

The utility model discloses a brushless motor and a food processor. The brushless motor comprises a stator assembly, a rotor assembly, a rear motor support and a bearing assembly. The rear motor support comprises a containing cavity and a bearing seat. The bearing seat is at least partially located in the containing cavity. The rotor assembly and the stator assembly are located in the containing cavity. The rotor assembly comprises a motor shaft. The rotor assembly is rotatably connected with the bearing assembly through the motor shaft, the bearing assembly is installed in the bearing seat, and the stator assembly is fixed with the rear motor support to enable the rotor assembly to rotate relative to the stator assembly, so that the front motor support is not required to be connected with the stator assembly to fix the bearing, on one hand, the cost of the front motor support is saved, and the cost is reduced. The cost of the brushless motor is low; on the other hand, the installation process of the front motor support and the stator assembly is omitted, and the production efficiency of the brushless motor is high; on the other hand, a front motor support is omitted, and the brushless motor is light in weight.

Description

TECHNICAL FIELD

[0001] The present application relates to an electric machine, in particular to a brushless electric machine and a food processor. BACKGROUND

[0002] The food processor comprises a brushless electric machine, a stirring cup and a blade assembly. The brushless electric machine drives the blade assembly to rotate in the stirring cup, so that the food materials in the stirring cup can be processed.

[0003] At present, the development trend of the food processor is light weight and low cost, therefore, it is necessary to improve the food processor to meet the demand of light weight and low cost. CONTENT OF THE INVENTION

[0004] The purpose of the present application is to disclose a brushless electric machine and a food processor. The brushless electric machine is low in weight and low in cost.

[0005] In the first aspect, the present application discloses a brushless electric machine. The brushless electric machine comprises a stator assembly, a rotor assembly, a rear motor support and a bearing assembly. The rear motor support comprises a receiving cavity and a bearing seat, the bearing seat is at least partially located in the receiving cavity; the rotor assembly and the stator assembly are located in the receiving cavity. The rotor assembly comprises a motor shaft, the rotor assembly is rotationally connected with the bearing assembly through the motor shaft, the bearing assembly is installed in the interior of the bearing seat, and the stator assembly is fixed with the rear motor support, so that the rotor assembly can rotate relative to the stator assembly.

[0006] As described above, since the rear motor support comprises a receiving cavity and a bearing seat, the rotor assembly and the stator assembly are both located in the receiving cavity, the rotor assembly is rotationally connected with the bearing assembly through the motor shaft, the bearing assembly is installed in the interior of the bearing seat, and the stator assembly is fixed with the rear motor support to enable the rotor assembly to rotate relative to the stator assembly, thus, the front motor support (for example, the front motor support is connected with the stator assembly to fix the bearing) is no longer needed, which has the following beneficial effects: on the one hand, the cost of the front motor support is saved, and the brushless electric machine is low in cost; on the other hand, the installation process of the front motor support and the stator assembly is saved, and the production efficiency of the brushless electric machine is high; on the other hand, the front motor support is saved, and the brushless electric machine is light in weight. In addition, the bearing seat is at least partially located in the receiving cavity, which can make the motor shaft shorter, on the one hand, the motor shaft is high in machining precision, and on the other hand, the brushless electric machine assembly will not swing due to the jumping amount and other reasons in work.

[0007] In some embodiments, the receiving cavity comprises a cavity opening communicating with the outside of the brushless electric machine, and at least the stator assembly of the rotor assembly and the stator assembly is exposed through the cavity opening.

[0008] As set forth above, since at least the stator assembly is exposed through the cavity opening, the front end of the stator assembly of the stator assembly is ensured to be free of the front motor support, at least the stator assembly is not shielded, and the heat of the coil winding of the stator assembly can be well dissipated to the outside of the brushless motor, and the heat dissipation effect is good.

[0009] In some embodiments, the rotor assembly is surrounded by the stator assembly, and the rotor assembly comprises a bearing seat installation cavity; and the bearing seat is located in the bearing seat installation cavity.

[0010] As set forth above, since the rotor assembly is surrounded by the stator assembly, and the rotor assembly comprises a bearing seat installation cavity, compared with the rotor assembly not comprising a bearing seat installation cavity, the bearing seat installation cavity reduces the weight of the rotor assembly, and thus the brushless motor is light in weight.

[0011] In some embodiments, the motor shaft comprises an output end for connecting with an external component; the stator assembly comprises a stator assembly front end, and the rotor assembly comprises a rotor assembly front end; the rear motor support comprises a motor support end surface opposite to the accommodating cavity; one of the rotor assembly front end and the stator assembly front end is taken as a reference; and the bearing assembly is located between the reference and the motor support end surface.

[0012] As set forth above, since the motor shaft is connected with the external component, the length of the motor shaft can be adjusted according to the external component, and the length of the motor shaft can not be considered as a factor of the axial height of the brushless motor along the motor shaft, because the rotor assembly and the stator assembly are relatively rotated, and the height difference of the rotor assembly and the stator assembly in the axial direction of the motor shaft is not too large, and thus, in the above setting, the bearing assembly is located between the reference and the motor support end surface, so that the axial height of the brushless motor is determined only by the axial distance between the reference and the motor support end surface, the axial height of the brushless motor is low, and the brushless motor is not easy to swing during operation, and the like.

[0013] In some embodiments, the bearing assembly comprises a first bearing and a second bearing which are spaced apart along the axial direction of the motor shaft; or the bearing assembly comprises a first bearing and a second bearing which are stacked.

[0014] As set forth above, in the case that the brushless motor is connected with a load, according to the principle of lever, the first bearing corresponds to a fulcrum, when the first bearing and the second bearing are spaced apart, the force arm of the second bearing relative to the first bearing (fulcrum) is longer, and when the motor shaft is connected with a load, the second bearing bears a smaller force, so that the second bearing is not easy to be damaged, and the brushless motor is not easy to swing during movement. In the case that the bearing assembly comprises stacked bearings, the combination of the stacking and the bearing assembly located between the reference and the motor support end surface eliminates the need for a bearing limiting sleeve between the bearings of the bearing assembly, and the installation is more convenient.

[0015] In some embodiments, the stator assembly comprises a stator assembly rear end, the rotor assembly comprises a rotor assembly rear end, the rotor assembly rear end is located forward of the stator assembly rear end; in the case that the first bearing and the second bearing are spaced apart along the axial direction of the motor shaft, the distance between the first bearing and the reference is less than or equal to the distance between the first bearing and the motor frame end face, and the second bearing is located between the rotor assembly rear end and the motor frame end face.

[0016] As described above, in the case that the first bearing and the second bearing are spaced apart along the axial direction of the motor shaft, the distance between the first bearing and the reference is less than or equal to the distance between the first bearing and the motor frame end face, and the second bearing is located between the rotor assembly rear end and the motor frame end face, the second bearing is less likely to be damaged, and the brushless motor is less likely to swing during movement.

[0017] In some embodiments, the motor shaft comprises an output end for connecting with an external component, the stator assembly comprises a stator assembly front end, the rotor assembly comprises a rotor assembly front end, one of the rotor assembly front end and the stator assembly front end is taken as a reference, and the bearing seat extends forward of the reference; the rear motor support comprises a motor frame end face opposite to the accommodating cavity; the bearing assembly comprises a first bearing and a second bearing spaced apart along the axial direction of the motor shaft, the first bearing is flush with or located forward of the reference; the second bearing is located between the reference and the motor frame end face; or, the bearing assembly comprises a plurality of stacked bearings, and the bearing assembly is at least partially located between the reference and the end of the bearing seat.

[0018] As described above, in the case that the bearing seat extends forward of the reference, the first bearing is flush with or located forward of the rotor assembly front end, and the second bearing is located between the rotor assembly front end and the motor frame end face, the brushless motor as a whole is relatively close to the load, i.e., the first bearing as a fulcrum is relatively close to the load, so that the second bearing is subjected to less force relative to the fulcrum, the second bearing is less likely to be damaged, and the brushless motor is less likely to swing, etc. In the case that the bearing seat extends forward of the reference, the bearing assembly is at least partially located between the reference and the end of the bearing seat, so that the brushless motor as a whole is relatively close to the load, the motor shaft can be shorter, and the brushless motor is less likely to swing.

[0019] In some embodiments, the rotor assembly includes a rotor front end plate, a rotor rear end plate, a rotor core, and magnetic plates; the magnetic plates are distributed circumferentially on the rotor core; the rotor core includes a through hole along the axial direction of the motor shaft; the rotor rear end plate includes a base plate and a column standing on the base plate, the column including the bearing housing mounting cavity; the column is inserted into the through hole and tightly fitted, the rotor core is clamped by the rotor front end plate and the rotor rear end plate, and the motor shaft passes through and is tightly fitted with the rotor front end plate and the rotor rear end plate.

[0020] As described above, the rotor core is clamped by the rotor front end plate and the rotor rear end plate, the motor shaft passes through and is tightly fitted to the rotor front end plate and the rotor rear end plate, and the column is inserted into the through hole and tightly fitted. In this way, the rotor assembly is easy to assemble.

[0021] In some embodiments, the rear motor bracket includes a motor frame end face opposite to the receiving cavity; the bearing assembly includes a stacked first bearing and a second bearing; the motor shaft includes an output end connected to an external component, with the output end as the front, the stator assembly includes a stator assembly rear end, and the rotor assembly includes a rotor assembly rear end; with the rear end of the stator assembly and the front of the rear end of the rotor assembly as a reference, the first bearing is located between the reference and the motor frame end face, and the second bearing protrudes rearward from the motor frame end face.

[0022] As described above, since the first bearing is located between the reference point and the end face of the motor frame, and the second bearing protrudes rearward from the end face of the motor frame, and the first and second bearings are stacked, assembly is simple; the bearing assembly only needs to be installed from the rear motor bracket into the bearing housing. Simultaneously, the stacking of the first and second bearings eliminates the need for structures such as bearing retaining sleeves, thus reducing costs. Furthermore, in this configuration, it is not necessary to form the bearing housing mounting cavity on the rotor assembly, and the structure of the rotor assembly does not need to be altered.

[0023] This application also discloses a food processor. The food processor includes any of the aforementioned brushless motors, a mixing cup, and a blade assembly. The motor shaft of the brushless motor extends into the mixing cup and is directly connected to the blade assembly. The brushless motor drives the blade assembly to rotate within the mixing cup. Alternatively, the food processor includes a main unit and a mixing cup assembly, the mixing cup assembly including the mixing cup and the blade assembly. The main unit includes any of the aforementioned brushless motors, and the motor shaft is connected to a first coupling. The blade assembly is connected to a second coupling. When the mixing cup assembly is assembled into the main unit, the first coupling and the second coupling are connected, and the brushless motor drives the blade assembly to rotate within the mixing cup.

[0024] As described above, the beneficial effects of the aforementioned brushless motor in the food processor will not be repeated here. Attached Figure Description

[0025] Figure 1 This is a perspective view of a brushless motor according to this application;

[0026] Figure 2 yes Figure 1 An exploded view of the brushless motor shown.

[0027] Figure 3 This is a schematic diagram of the rear motor bracket and bearing assembly of a brushless motor according to this application.

[0028] Figure 4 This is a cross-sectional view of a rotor assembly of a brushless motor according to this application;

[0029] Figure 5 This is a perspective view of the rotor rear end plate of a rotor assembly of a brushless motor according to this application;

[0030] Figure 6 This is a perspective view of the rotor front end plate of a rotor assembly of a brushless motor according to this application;

[0031] Figure 7 This is a perspective view of the rotor core of a rotor assembly of a brushless motor according to this application;

[0032] Figure 8 This is a schematic diagram of the first position of the bearing assembly in the brushless motor according to this application;

[0033] Figure 9 This is a schematic diagram of the second position of the bearing assembly in the brushless motor according to this application;

[0034] Figure 10 This is a schematic diagram of the third position of the bearing assembly in the brushless motor according to this application;

[0035] Figure 11 This is a schematic diagram of the fourth position of the bearing assembly in the brushless motor according to this application;

[0036] Figure 12 This is a schematic diagram of the fifth position of the bearing assembly in the brushless motor according to this application;

[0037] Figure 13 This is a schematic diagram of the sixth position of the bearing assembly in the brushless motor according to this application;

[0038] Figure 14 This is a schematic diagram of the seventh position of the bearing assembly in the brushless motor according to this application;

[0039] Figure 15This is a schematic diagram of the eighth position of the bearing assembly in the brushless motor according to this application;

[0040] Figure 16 This is a schematic diagram of the first type of food processor described in this application;

[0041] Figure 17 This is a schematic diagram of the second type of food processor in this application. Detailed Implementation

[0042] The technical solutions in the embodiments (or "implementations") of this application will be clearly and completely described herein with reference to the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0043] If the embodiments of this application contain terms relating to directional indications or positional relationships (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 of the components in a specific posture (as shown in the attached figures); if the specific posture changes, the directional indications or positional relationships will also change accordingly. Furthermore, the terms "first" and "second" used in the embodiments of this application are only for descriptive convenience and should not be construed as indicating or implying relative importance.

[0044] See Figure 1 , Figure 2 as well as Figures 8 to 15 This application discloses a brushless motor 10. The brushless motor 10 includes a stator assembly 1, a rotor assembly 2, a rear motor bracket 3, and a bearing assembly 4. In this application, the stator assembly 1 surrounds the rotor assembly 2; in some embodiments, the stator assembly 1 may be surrounded by the rotor assembly 2. The rear motor bracket 3 includes a receiving cavity 31 and a bearing housing 32. The bearing housing 32 is at least partially located within the receiving cavity 31. See [reference needed]. Figure 8 , Figures 11 to 15 The bearing housing 32 is completely located within the receiving cavity 31. See also... Figure 10 The bearing housing 32 is partially located inside the receiving cavity 31, and the other part is located outside the receiving cavity 31, facing away from the output end 211 of the motor shaft 21. See also Figure 12 The bearing housing 32 has a portion located within the receiving cavity 31, and another portion extending out of the receiving cavity 31 towards the output end 211 of the motor shaft 21. The bearing assembly 4 is installed inside the bearing housing 32. For one embodiment of how it is located internally, see [link to embodiment]. Figure 4 , Figures 8 to 15The bearing housing 32 includes a bearing housing cavity 321. The bearing assembly 4 is located inside the bearing housing cavity 321, and the manner in which the bearing assembly 4 is assembled with the bearing housing 32 and located inside the bearing housing 32 is not limited.

[0045] The stator assembly 1 and the rotor assembly 2 are located within the receiving cavity 31. The rotor assembly 2 includes a motor shaft 21, and the rotor assembly 2 is rotatably connected to the bearing assembly 4 via the motor shaft 21. The stator assembly 1 is fixed to the rear motor bracket 3 so that the rotor assembly 2 can rotate relative to the stator assembly 1.

[0046] Some brushless motors include a front motor bracket, a rear motor bracket, a stator assembly, a rotor assembly, a first bearing, and a second bearing. The rotor assembly includes a motor shaft. With reference to the axial direction of the motor shaft, the stator assembly includes opposing stator assembly front ends and stator assembly rear ends. The front motor bracket is fixed to the front end of the stator assembly, and the first bearing is fixed to the front motor bracket. The rear motor bracket is fixed to the rear end of the stator assembly, and the second bearing is fixed to the rear motor bracket. The motor shaft of the rotor assembly is connected to the first and second bearings.

[0047] Compared with the brushless motors described above, the brushless motor of this application has the following advantages: the rear motor bracket 3 includes a receiving cavity 31 and a bearing seat 32. Both the rotor assembly 2 and the stator assembly 1 are located within the receiving cavity 31. The rotor assembly 2 is rotatably connected to the bearing assembly 4 via the motor shaft 21. The bearing assembly 4 is installed inside the bearing seat 32. Furthermore, the stator assembly 1 is fixed to the rear motor bracket 3 to enable the rotor assembly 2 to rotate relative to the stator assembly 1. Therefore, a front motor bracket (e.g., using a front motor bracket connected to the stator assembly to fix the bearing) is no longer needed. This has the following beneficial effects: firstly, it saves the cost of the front motor bracket, resulting in a lower cost for the brushless motor; secondly, it eliminates the installation process between the front motor bracket and the stator assembly 1, leading to higher production efficiency for the brushless motor; and thirdly, eliminating the front motor bracket reduces the weight of the brushless motor 10. In addition, the bearing seat 32 is at least partially located within the receiving cavity 31, allowing for a shorter motor shaft 21. This results in higher machining accuracy for the motor shaft and prevents the brushless motor assembly from swaying due to runout or other reasons during operation.

[0048] See Figure 1 , Figure 3 , Figures 4 to 15The receiving cavity 31 includes an opening 311 communicating with the outside of the brushless motor. The stator assembly 1 and the rotor assembly 2 are also exposed through the opening 311. One function of this exposure is to dissipate the heat generated by the coil windings of the stator assembly 1 to the outside of the brushless motor 10. Therefore, the method of exposure is not limited; for example, the stator assembly 1 and the rotor assembly 2 can be exposed as a whole through the opening 311. Based on the subsequent function of the exposure, at least the stator assembly 1 needs to be exposed through the opening 311.

[0049] As described above, since at least the stator assembly 1 is exposed through the cavity 311 and there is no front motor bracket at the front end of the stator assembly 1, the stator assembly 1 is not obstructed, and the heat of the coil winding of the stator assembly 1 can be well dissipated to the outside of the brushless motor 10, resulting in good heat dissipation.

[0050] See Figure 4 , Figure 8 , Figure 9 , Figures 11 to 15 The rotor assembly 2 is surrounded by the stator assembly 1, and is also known in the industry as an internal rotor motor. The rotor assembly 2 includes a bearing housing mounting cavity 231. In some embodiments, the rotor assembly 2 includes a rotor front end plate 22 and a rotor rear end plate 23. The bearing housing mounting cavity 231 is disposed in the rotor rear end plate 23. One function of the bearing housing mounting cavity 231 is to accommodate a bearing housing 32 and the bearing assembly 4 within the bearing housing 32, and its structure is not limited to the structure shown in the figure. The bearing housing 32 is located within the bearing housing mounting cavity 231.

[0051] As described above, since the rotor assembly 2 is surrounded by the stator assembly 1, the rotor assembly 2 includes a bearing housing mounting cavity 231. Compared with the rotor assembly 2 not including the bearing housing mounting cavity 231, the bearing housing mounting cavity 231 reduces the weight of the rotor assembly 2, and thus the brushless motor 10 is lighter.

[0052] See Figure 8 , Figure 11 as well as Figures 13 to 15 The motor shaft 21 includes an output end 211 connected to an external component. With the output end 211 as the front, the stator assembly 1 includes a stator assembly front end 11. The rotor assembly 2 includes a rotor assembly front end 201. In most cases, the stator assembly front end 11 of the stator assembly 1 is further forward than the rotor assembly front end 201 of the rotor assembly 2; in some cases, the rotor assembly front end 201 is further forward than the stator assembly front end 11. The rear motor frame 3 includes a motor frame end face 33 opposite to the receiving cavity 31. The motor frame end face 33 is planar in this application. See also... Figure 8 , Figure 11 , Figure 13 , Figure 14and Figure 15 With the front end of the rotor assembly and the front end of the stator assembly as a reference, the bearing assembly 4 is located between the reference and the end face 33 of the motor frame, as shown in the figure between the front end 11 of the stator assembly and the end face 33 of the motor frame. Being located between the reference (front end 11 of the stator assembly) and the end face 33 of the motor frame includes the bearing assembly 4 being flush with the end face 33 of the motor frame, or flush with the reference, or having a certain distance from both the end face 33 of the motor frame and the reference, for example... Figure 8 In the middle, the first bearing 41 is a certain distance from the reference (stator assembly front end 11) or the rotor assembly front end 201, and the second bearing 42 is flush with the rotor assembly rear end 202 but is a certain distance from the motor frame end face 33.

[0053] As described above, since the motor shaft 21 is connected to external components, and the length of the motor shaft 21 is adjusted according to the external components, it can be disregarded as a factor in determining the axial height of the brushless motor along the motor shaft 21. Because the rotor assembly 2 and the stator assembly 1 rotate relative to each other, the axial height difference between them on the motor shaft will not be too large. Therefore, in the above configuration, the bearing assembly 4 is located between the reference and the end face 33 of the motor frame, so that the axial height of the brushless motor is determined only by the axial distance between the reference and the end face 33 of the motor frame. The low axial height of the brushless motor makes it less prone to swaying during operation, etc.

[0054] See Figure 8 , Figure 14 and Figure 15 The bearing assembly 4 includes a first bearing 41 and a second bearing 42 spaced apart along the axial direction of the motor shaft 21. The spacing is not limited; for example, it can be achieved using bearing retaining sleeves 43. See also... Figure 11 and Figure 13 The bearing assembly 4 includes a stacked first bearing 41 and a second bearing 42. See also Figure 3 and Figure 10 In the stacked configuration, a shim 44 is provided between the first bearing 41 and the second bearing 42. The mounting method of the bearing assembly 4 can be found in [reference needed]. Figures 13 to 15 ,exist Figure 13 In the middle, bearing assembly 4 is assembled sequentially from bottom to top. Figure 14 In the middle, bearing assembly 4 is assembled sequentially from top to bottom. Figure 15 In the process, the first bearing 41 is assembled from top to bottom, and the second bearing 42 is assembled from bottom to top.

[0055] As described above, when the brushless motor is connected to a load, according to the lever principle, the first bearing 41 acts as a fulcrum. When the first bearing 41 and the second bearing 42 are spaced apart, the lever arm of the second bearing 42 relative to the first bearing 41 (fulcrum) is longer. When the motor shaft 21 is connected to a load, the second bearing 42 experiences less force, thus making it less prone to damage. Consequently, the brushless motor is less likely to sway during operation. When the bearing assembly 4 includes stacked bearings, the stack and the bearing assembly are combined between the reference and the motor frame end face 33. Bearing retaining sleeves 43 are not required between the bearing assemblies, making installation more convenient.

[0056] See Figure 8 , Figure 14 and Figure 15 Still taking the output end 211 as the front, the stator assembly 1 includes a stator assembly rear end 12, and the rotor assembly 2 includes a rotor assembly rear end 202, with the rotor assembly rear end 202 positioned forward of the stator assembly rear end 12. When the first bearing 41 and the second bearing 42 are axially spaced along the motor shaft 21, the distance between the first bearing 41 and the reference is less than or equal to the distance between the first bearing 41 and the motor frame end face 33. For example, if the distance between the first bearing 41 and the reference is h, and the distance between the first bearing 41 and the motor frame end face 33 is H, see [reference needed]. Figure 8 h < H; see also Figure 14 h = H. Of course, when the reference point is the front end 201 of the rotor assembly, h is the distance between the first bearing 41 and the front end 201 of the rotor assembly. The second bearing 42 is located between the rear end 202 of the rotor assembly and the end face 33 of the motor frame.

[0057] As described above, with the first bearing 41 and the second bearing 42 spaced apart along the axial direction of the motor shaft 21, the distance between the first bearing 41 and the reference is less than or equal to the distance between the first bearing 41 and the end face 33 of the motor frame, the second bearing 42 is located between the rear end 202 of the rotor assembly and the end face 33 of the motor frame, the second bearing 42 is not easily damaged, and the brushless motor is not easily wobbled during operation.

[0058] See Figure 9 The rear motor bracket 3 includes a motor bracket end face 33 opposite to the receiving cavity 31. The motor shaft 21 includes an output end 211 connected to an external component. With the output end 211 as the front, the stator assembly 1 includes a stator assembly front end 11. The rotor assembly 2 includes a rotor assembly front end 201. With the rearmost of the rotor assembly front end 201 and the stator assembly front end 11 as a reference, the bearing housing 32 extends forward beyond the reference (in this application, it extends beyond the rotor assembly front end 201). See also Figure 9The bearing assembly 4 includes a first bearing 41 and a second bearing 42 spaced apart along the axial direction of the motor shaft 21. The first bearing 41 is flush with the front end 201 (reference) of the rotor assembly. In some embodiments, the first bearing 41 is positioned forward of the front end 201 of the rotor assembly. In both of these cases, the second bearing 42 is located between the front end 201 (reference) of the rotor assembly and the end face 33 of the motor frame, and also includes... Figure 9 As shown, it is located between the front end 201 of the rotor assembly and the rear end 202 of the rotor assembly or the rear end 12 of the stator assembly.

[0059] As described above, since the bearing housing 32 extends beyond the reference, the first bearing 41 is flush with or forward of the reference (as shown in the figure, flush with or forward of the front end 201 of the rotor assembly), and the second bearing 42 is located between the front end 201 of the rotor assembly and the end face 33 of the motor frame. In this way, the brushless motor as a whole is closer to the load, that is, the first bearing 41 is closer to the load as a fulcrum. Thus, the second bearing 42 is subjected to less force relative to the fulcrum, the second bearing 42 is not easily damaged, and the brushless motor is not easily wobbled, etc.

[0060] See Figure 12 With the bearing housing 32 extending forward beyond the reference point (the front end 11 of the stator assembly), the bearing assembly 4 includes a plurality of stacked bearings (a first bearing 41 and a second bearing 42), the bearing assembly 4 being at least partially located between the reference point and the end of the bearing housing 32. See also Figure 12 The second bearing 42 is located partly on the front end 201 of the rotor assembly and partly below the front end 201 of the rotor assembly.

[0061] With the above configuration, when the bearing housing 32 extends forward beyond the reference, the bearing assembly 4 is at least partially located between the reference and the end of the bearing housing 32, which allows the brushless motor to be closer to the load, the motor shaft 21 to be shorter, and the brushless motor 10 to be less prone to wobbling.

[0062] See Figure 4 , Figures 8 to 15 The rotor assembly 2 includes a rotor front end plate 22, a rotor rear end plate 23, a rotor core 24, and magnetic sheets 25. The magnetic sheets 25 are distributed circumferentially around the rotor core 24. Figure 7 In this design, the rotor core 24 has multiple mounting holes arranged circumferentially. Magnets 25 are mounted in these mounting holes, thus achieving the circumferential distribution of the rotor core 24. The rotor core 24 includes a through hole 242 along the axial direction of the motor shaft 21. (See also...) Figure 5The rotor rear end plate 23 includes a base plate 232 and a column 233 standing on the base plate 232. The column 233 includes the bearing housing mounting cavity 231. The column 233 is inserted into the through hole 242 and tightly fitted. The rotor core 24 is clamped by the rotor front end plate 22 and the rotor rear end plate 23. The motor shaft 21 passes through and is tightly fitted to the rotor front end plate 22 and the rotor rear end plate 23.

[0063] As described above, the rotor core 24 is clamped by the rotor front end plate 22 and the rotor rear end plate 23, the motor shaft 21 passes through and is tightly fitted with the rotor front end plate 22 and the rotor rear end plate 23, and the column 233 is inserted into the through hole 242 and tightly fitted. In this way, the rotor assembly 2 is easy to assemble.

[0064] To prevent rotation between the rotor core 24 and the rotor rear end plate 23, an anti-rotation structure is provided between them. One such structure is as follows: the through hole 242 of the rotor core is polygonal. The cross-section of the column 233 is also polygonal. Because adjacent sides of the polygon can prevent rotation, the column 233, when inserted into the through hole 242, forms an anti-rotation structure. Of course, the anti-rotation structure can also be a flat section, etc. To prevent rotation between the rotor front end plate 22 and the rotor rear end plate 23, an anti-rotation structure is also provided between them. One such structure is as follows: the rotor front end plate 22 has two limiting posts 221. The rotor rear end plate 23 has two limiting holes 234. The limiting posts 221 are inserted into the limiting holes 234 one-to-one, thereby achieving anti-rotation.

[0065] See Figure 10 The rear motor bracket 3 includes a motor frame end face 33 opposite to the receiving cavity 31. The bearing assembly 4 includes a stacked first bearing 41 and a second bearing 42. The motor shaft 21 includes an output end 211 for connection to an external component. With the output end 211 forward, the stator assembly 1 includes a stator assembly rear end 12. The rotor assembly 2 includes a rotor assembly rear end 202. Based on the forward of the stator assembly rear end 12 and the rotor assembly rear end 202, in this application, with the rotor assembly rear end 202 as the reference, the first bearing 41 is located between the reference (rotor assembly rear end 202) and the motor frame end face 33, and the second bearing 42 protrudes rearward from the motor frame end face 33.

[0066] As described above, since the first bearing 41 is located between the reference and the motor frame end face 33, and the second bearing 42 protrudes rearward from the motor frame end face 33, and the first bearing 41 and the second bearing 42 are stacked, it is only necessary to insert the bearing assembly 4 from the rear motor bracket 3 into the bearing housing 32, which is convenient for assembly. At the same time, the stacking of the first bearing 41 and the second bearing 42 eliminates the need for structures such as bearing retaining sleeves, which helps reduce costs. Furthermore, in the above configuration, it is not necessary to form the bearing housing mounting cavity 231 on the rotor assembly, and the structure of the rotor assembly does not need to be changed.

[0067] See Figure 16 This application discloses a food processor. The food processor includes any of the aforementioned brushless motors 10, a mixing bowl 20, and a blade assembly 30. The motor shaft 21 of the brushless motor 10 extends into the mixing bowl 20 and is directly connected to the blade assembly 30. The brushless motor 10 drives the blade assembly 30 to rotate within the mixing bowl 20. That is, Figure 10 The food processor shown is a direct drive food processor.

[0068] As described above, since the food processor includes any of the aforementioned brushless motors 10, the food processor at least has the beneficial effects of the brushless motor. For example, the brushless motor is low in cost and light in weight, which helps to reduce the cost and weight of the food processor. Also, when the axial height of the brushless motor 10 on the motor shaft 21 is low, the proportion of the height of the brushless motor 10 in the height of the cup base is increased, which helps to lower the center of gravity of the cup base and improve the stability of the blending cup 20. In addition, it also helps to reduce the overall height of the machine, making it easier to store or carry.

[0069] See Figure 17 The food processor includes a main unit 100 and a blending cup assembly 200, the blending cup assembly 200 including a blending cup 20 and a blade assembly 30. The main unit 100 includes any of the aforementioned brushless motors 10, the motor shaft 21 of which is connected to a first coupling; the blade assembly 30 is connected to a second coupling. The first coupling and the second coupling can each be a clutch, or, in the case of magnetic drive, the first coupling and the second coupling can each include magnetic elements to drive the blade assembly 30 magnetically. When the blending cup assembly 200 is assembled to the main unit 100, the first coupling and the second coupling are connected, and the brushless motor 10 drives the blade assembly 30 to rotate within the blending cup 20.

[0070] As described above, since the food processor includes any of the aforementioned brushless motors 10, the food processor at least has the beneficial effects of the brushless motor. For example, the brushless motor is low in cost and light in weight, which is beneficial to the low cost and light weight of the food processor. Also, when the axial height of the brushless motor 10 on the motor shaft 21 is low, the proportion of the height of the brushless motor 10 in the height of the main unit 100 is increased, which is beneficial to lower the center of gravity of the main unit 100 and improve the stability of the main unit 100. In addition, the main unit 100 is lighter and thinner.

[0071] It should be noted that the technical solutions or 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 accompanying drawings; all modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A brushless electric motor characterized by, The brushless motor comprises a stator assembly (1), a rotor assembly (2), a rear motor support (3) and a bearing assembly (4), wherein; The rear motor support (3) comprises a receiving cavity (31) and a bearing seat (32), and the bearing seat (32) is at least partially located in the receiving cavity (31); The rotor assembly (2) and the stator assembly (1) are located in the receiving cavity (31); The rotor assembly (2) comprises a motor shaft (21), the rotor assembly (2) is rotationally connected with the bearing assembly (4) through the motor shaft (21), the bearing assembly (4) is installed in the interior of the bearing seat (32), and the stator assembly (1) is fixed with the rear motor support (3) so that the rotor assembly (2) can rotate relative to the stator assembly (1).

2. The brushless motor of claim 1, wherein, The receiving cavity (31) comprises a cavity opening (311) communicating with the outside of the brushless motor, and at least the stator assembly (1) is exposed through the cavity opening (311) among the stator assembly (1) and the rotor assembly (2).

3. The brushless motor of claim 1, wherein; The rotor assembly (2) is surrounded by the stator assembly (1), and the rotor assembly (2) comprises a bearing seat mounting cavity (231); the bearing seat (32) is located in the bearing seat mounting cavity (231).

4. The brushless motor of claim 3, wherein, The motor shaft (21) comprises an output end (211) for connecting with an external component; In front of the output end (211), the stator assembly (1) comprises a stator assembly front end (11), and the rotor assembly (2) comprises a rotor assembly front end (201); The rear motor support (3) comprises a motor support end face (33) opposite to the receiving cavity (31); in the case that one of the rotor assembly front end (201) and the stator assembly front end (11) is taken as a reference, the bearing assembly (4) is located between the reference and the motor support end face (33).

5. The brushless motor of claim 4, wherein, The bearing assembly (4) comprises a first bearing (41) and a second bearing (42) which are spaced apart along the axial direction of the motor shaft (21); or the bearing assembly (4) comprises a first bearing (41) and a second bearing (42) which are stacked.

6. The brushless motor of claim 5, wherein, The stator assembly (1) comprises a stator assembly rear end (12), and the rotor assembly (2) comprises a rotor assembly rear end (202), and the rotor assembly rear end (202) is located in front of the stator assembly rear end (12); In the case that the first bearing (41) and the second bearing (42) are spaced apart along the axial direction of the motor shaft (21), the distance between the first bearing (41) and the reference is less than or equal to the distance between the first bearing (41) and the motor support end face (33), and the second bearing (42) is located between the rotor assembly rear end (202) and the motor support end face (33).

7. The brushless motor of claim 3, wherein, The motor shaft (21) comprises an output end (211) for connecting with external components, the stator assembly (1) comprises a stator assembly front end (11) in front of the output end (211), the rotor assembly (2) comprises a rotor assembly front end (201), and the bearing seat (32) protrudes forward from the rear end of the rotor assembly front end (201) and the stator assembly front end (11) taken as a reference; The bearing assembly (4) comprises a first bearing (41) and a second bearing (42) spaced apart along the axial direction of the motor shaft (21), and the first bearing (41) is flush with or located forward of the reference; Alternatively, the bearing assembly (4) comprises a plurality of stacked bearings, and the bearing assembly (4) is located at least partially between the reference and the end of the bearing seat (32).

8. The brushless motor of claim 3, wherein, The rotor assembly (2) comprises a rotor front end plate (22), a rotor rear end plate (23), a rotor core (24), and a magnetic sheet (25); The magnetic sheet (25) is distributed in the circumferential direction of the rotor core (24); The rotor core (24) comprises a through hole (242) in the axial direction of the motor shaft (21); The rotor rear end plate (23) comprises a column (233) comprising the bearing seat mounting cavity (231); the column (233) is inserted into and tightly fitted with the through hole (242), the rotor core (24) is clamped by the rotor front end plate (22) and the rotor rear end plate (23), and the motor shaft (21) is provided through and tightly fitted with the rotor front end plate (22) and the rotor rear end plate (23).

9. The brushless motor of claim 1, wherein, The rear motor support (3) comprises a motor support end face (33) opposite to the accommodating cavity (31); the bearing assembly (4) comprises a first bearing (41) and a second bearing (42) stacked together; the motor shaft (21) comprises an output end (211) for connecting with external components, the stator assembly (1) comprises a stator assembly rear end (12), and the rotor assembly (2) comprises a rotor assembly rear end (202); The first bearing (41) is located between the reference and the motor support end face (33), and the second bearing (42) protrudes rearward from the motor support end face (33), taken as a reference from the front end of the stator assembly rear end (12) and the rotor assembly rear end (202).

10. A food processor, characterized in that, The food processor comprises the brushless motor (10) of any one of claims 1 to 9, a stirring cup (20), and a blade assembly (30), the motor shaft (21) of the brushless motor (10) is inserted into the stirring cup (20) and directly connected with the blade assembly (30), and the brushless motor (10) drives the blade assembly (30) to rotate in the stirring cup (20). Alternatively, the food processor comprises a main machine (100) and a blending cup assembly (200), the blending cup assembly (200) comprising a blending cup (20) and a blade assembly (30); the main machine (100) comprises the brushless motor (10) as claimed in any one of claims 1 to 9, the motor shaft (21) being connected with a first coupling; the blade assembly (30) being connected with a second coupling; in the case that the blending cup assembly (200) is assembled to the main machine (100), the first coupling and the second coupling are connected, and the brushless motor (10) drives the blade assembly (30) to rotate in the blending cup (20).

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