Motor and food processor
By using a hollow stator support and shaft bracket to support the rotor shaft in the motor, the problems of poor heat dissipation and large axial dimensions of the motor are solved, and the motor is made thinner and its stability is improved.
Patent Information
- Application Number
- CN202521349772.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-06-27
- Publication Date
- 2026-08-25
- Estimated Expiration
- 2035-06-27
AI Technical Summary
The removal of the front or rear support of existing motors results in poor heat dissipation of the stator windings and a large axial dimension, making it difficult to achieve a thinner design.
The motor adopts a hollow stator support structure, with stator windings distributed around the cavity. The rotor assembly is located inside the cavity and the rotor shaft is supported by the first and second shaft supports. The edge area of the shaft supports does not exceed the axial dimension of the stator assembly, ensuring that the axial and radial dimensions of the motor are not increased.
This design achieves a thinner motor, reducing material costs and weight while improving heat dissipation and structural stability.
Smart Images
Figure CN224683952U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of motor technology, and more specifically, to a motor and a food processor. Background Technology
[0002] To achieve a thinner motor, some motors have eliminated the front or rear support brackets used to support the rotor shaft. For example, in motors that have eliminated the front support bracket, the rear support bracket is designed as a semi-enclosed structure, so that one end of the rotor assembly and stator assembly is wrapped by the rear support bracket. This structure is not conducive to heat dissipation of the stator windings, and it also results in a larger axial dimension of the motor. Summary of the Invention
[0003] This application provides a motor and a food processor that facilitate the miniaturization of the motor.
[0004] An electric motor, comprising:
[0005] A stator assembly includes a stator support and stator windings assembled on the stator support. The stator support is hollow, with a cavity formed in the hollow part, and the stator windings are distributed around the cavity.
[0006] A rotor assembly disposed within the cavity, the rotor assembly including a rotor shaft extending from the cavity;
[0007] A first shaft bracket, connected to one end of the stator support along the axial direction of the rotor shaft, is at least partially located within the cavity. The rotor shaft is rotatably supported on the first shaft bracket. The first shaft bracket includes a central region through which the rotor shaft passes and an edge region surrounding the central region. At the end where the first shaft bracket is located, the distance between the outer end face of the edge region and the outermost end face of the stator support at that end along the axial direction of the rotor shaft is (-3 / 10) to (1 / 5) of the overall axial dimension of the stator assembly.
[0008] The motor provided in this application has an edge region of the first shaft bracket recessed into the cavity along the axial direction of the rotor shaft, or flush with the outermost end face of the stator bracket, or protruding out of the cavity. Since the protruding dimension is no more than 1 / 5 of the overall axial dimension of the stator assembly, the edge region of the first shaft bracket will not excessively increase the axial dimension of the motor, which is beneficial to achieving a thinner motor.
[0009] Optionally, in the orthographic projection along the axial direction of the rotor shaft, the projection area of the stator winding surrounds the periphery of the projection area of the first shaft bracket. Thus, the outer contour of the first shaft bracket does not extend beyond the stator winding, nor does the first shaft bracket enclose the outside of the stator assembly, and the radial dimension of the motor is not increased, resulting in a small and lightweight first shaft bracket and reduced material costs.
[0010] Optionally, the first shaft bracket is detachably connected to the stator bracket. This detachable connection facilitates assembly and disassembly, and makes maintenance and upkeep easier.
[0011] Optionally, the first shaft bracket is snapped into the stator bracket. The connection method is simple.
[0012] Optionally, the first shaft bracket has a countersunk hole, and the stator bracket has a threaded hole. The countersunk hole, the threaded hole, and the rotor shaft are axially aligned. The countersunk hole and / or the threaded hole are configured as open holes with notches on the sides, and screws pass through the countersunk hole and engage with the threaded hole. The connection is simple and reliable.
[0013] Optionally, the first shaft bracket is threadedly connected to the stator support. The motor further includes an anti-loosening structure disposed at the threaded connection between the first shaft bracket and the stator support. In the direction in which the first shaft bracket is screwed out of the cavity, the anti-loosening structure is in a limiting fit with the first shaft bracket. The connection is simple and reliable.
[0014] Optionally, the first shaft bracket is provided with multiple snap-fit parts, and the stator bracket is provided with multiple snap-fit mating parts. The multiple snap-fit mating parts are located on the side surface of the stator bracket facing the cavity and are distributed circumferentially at intervals along this surface. The snap-fit parts and the snap-fit mating parts are snapped together one-to-one. The snap-fit design is simple in structure and convenient in operation.
[0015] Optionally, at the end where the first shaft bracket is located, along the axial direction of the rotor shaft, the distance between the outer end face of the edge region and the outermost end face of the stator bracket at that end is no greater than 1 / 6 of the overall dimension of the stator assembly in that axial direction. This further reduces the protrusion dimension of the edge region in that axial direction.
[0016] Optionally, at the end where the first shaft bracket is located, along the axial direction of the rotor shaft, the distance between the outer end face of the edge region and the outermost end face of the stator bracket at that end is no greater than 4 mm. This dimensional range has a relatively small impact on the overall axial dimension of the motor.
[0017] Optionally, the stator support includes a detachably connected upper stator support and a lower stator support. The stator assembly also includes a stator core, which is clamped and fixed between the upper stator support and the lower stator support. The direction of the clamping force is consistent with the axial direction of the rotor shaft. The stator winding is wound around the upper stator support and the lower stator support, so that the upper stator support and the lower stator support clamp the stator core. The clamping force is applied to the upper stator support and the lower stator support through the winding force of the stator winding, eliminating the need for fasteners and simplifying the structure.
[0018] Optionally, the stator winding includes multiple coils. The upper stator support is hollow, and around its hollow portion are multiple evenly distributed upper coil holes and upper spacers separating adjacent upper coil holes. The lower stator support is hollow, and around its hollow portion are multiple evenly distributed lower coil holes and lower spacers separating adjacent lower coil holes. The upper and lower spacers are axially opposite each other on the rotor shaft. Each coil is wound around a pair of opposing upper and lower spacers. This arrangement ensures a more uniform clamping force on the stator core, uniform spacing between adjacent coils, and adequate heat dissipation clearance.
[0019] Optionally, the upper stator support further includes an upper flange protruding along the edge of the upper coil hole, the upper flange protruding axially along the rotor shaft toward the side facing the lower stator support. The upper flange can define the shape of the coil when wound in the upper spacer, ensuring that an appropriate gap is reserved inside the coil.
[0020] Optionally, the lower stator support further includes a lower flange protruding along the edge of the lower coil hole, the lower flange protruding axially along the rotor shaft toward the side facing the upper stator support. The lower flange can define the shape of the coil when wound in the lower spacer, ensuring that an appropriate gap is reserved inside the coil.
[0021] Optionally, the plurality of upper coil holes are respectively connected to the cavities in the hollow portion of the stator upper support. The connections facilitate wiring.
[0022] Optionally, the plurality of lower coil holes are respectively connected to the cavities in the hollow portion of the lower stator support. This connection facilitates wiring.
[0023] Optionally, the stator assembly further includes a first bearing and a first axial limiting member. The rotor shaft is rotatably supported on the first shaft frame by the first bearing, and the first axial limiting member is assembled on the rotor shaft and is positioned at the outer end of the first bearing in the axial direction.
[0024] Optionally, one of the first shaft bracket and the stator bracket is provided with a protrusion and the other is provided with a groove. The protrusion protrudes radially along the rotor shaft, and the groove is recessed radially along the rotor shaft. The protrusion and the groove cooperate with each other.
[0025] Optionally, the rotor assembly further includes an upper rotor support, a lower rotor support, a rotor core, and magnetic steel sheets. The rotor core and the magnetic steel sheets are clamped and fixed between the upper rotor support and the lower rotor support. The magnetic steel sheets are assembled onto the rotor core, which is hollow. The rotor shaft is fixedly connected to the rotor core at the hollow portion. The rotor structure is simple and compact.
[0026] Optionally, the rotor assembly further includes a first limiting member, which connects the rotor upper bracket to the rotor shaft. This first limiting member thus provides axial positioning of the rotor shaft.
[0027] Optionally, the rotor assembly further includes a second limiting member, which connects the lower rotor support to the rotor shaft. This allows the rotor shaft to be axially limited by the second limiting member.
[0028] Optionally, the rotor shaft includes an output end for outputting torque. The first shaft is mounted on the side of the stator support facing the output end. A sleeve protruding towards the output end is formed in the central region, and at least two bearings for supporting the rotor shaft are provided inside the sleeve. In this design, multiple bearings can be used to achieve multi-point support for the rotor shaft, and the centralized arrangement of multiple bearings makes assembly more convenient.
[0029] Optionally, the motor further includes a second shaft bracket connected to the stator support. The second shaft bracket is spaced apart from the first shaft bracket along the axial direction of the rotor shaft and is at least partially located within the cavity. The rotor shaft is rotatably supported by the second shaft bracket. At one end where the second shaft bracket is located, along the axial direction of the rotor shaft, the distance between the outer end face of the second shaft bracket and the outermost end face of the stator support at that end is (-3 / 10) to (1 / 5) of the overall axial dimension of the stator assembly. The second shaft bracket and the first shaft bracket jointly support the rotor shaft, improving support stability. Furthermore, the outer end face of the second shaft bracket is recessed into or protrudes from the cavity along the axial direction of the rotor shaft. Since the protruding dimension is no more than 1 / 5 of the overall axial dimension of the stator assembly, the edge region of the second shaft bracket will not excessively increase the axial dimension of the motor, which is beneficial for achieving a thinner motor.
[0030] Optionally, in the orthogonal projection along the rotor shaft axis, the projected area of the stator winding surrounds the periphery of the projected area of the second shaft bracket. The second shaft bracket does not enclose the stator assembly, thus not increasing the radial dimension of the motor.
[0031] A food processor includes a motor as described in any of the preceding claims. The motor in this food processor is made thin, which helps to reduce the size of the food processor.
[0032] Optionally, the food processor includes;
[0033] The host unit includes the motor;
[0034] A cup assembly, assembled to the main unit, includes a cup body and a mixing blade. The mixing blade is rotatably assembled to the cup body, and the rotor shaft of the motor is drively connected to the mixing blade. This food processor has a blending function. Attached Figure Description
[0035] Figure 1 This is a schematic diagram of the top of the motor shown in an exemplary embodiment of this application;
[0036] Figure 2 yes Figure 1 A schematic diagram of the bottom of the motor is shown in the image;
[0037] Figure 3 yes Figure 1 An exploded view of the stator assembly shown in the image;
[0038] Figure 4 This is a schematic diagram of the support on the stator;
[0039] Figure 5 This is a schematic diagram of the lower stator support;
[0040] Figure 6 This is a cross-sectional view of the stator assembly;
[0041] Figure 7 This is an exploded view of the rotor assembly;
[0042] Figure 8 This is a cross-sectional view of the rotor assembly;
[0043] Figure 9 This is a cross-sectional view of the motor;
[0044] Figure 10 yes Figure 9 An enlarged view of part A in the middle;
[0045] Figure 11 This is a schematic diagram of the first shaft bracket inverted;
[0046] Figure 12 This is a schematic diagram of the second shaft bracket being inverted;
[0047] Figure 13 This is a cross-sectional view of an electric motor shown in yet another embodiment of this application;
[0048] Figure 14 yes Figure 13 A schematic diagram of the motor is shown in the image;
[0049] Figure 15 This is a top view of the motor;
[0050] Figure 16 yes Figure 15 The cross-sectional view of the motor shown in the image;
[0051] Figure 17 This is a schematic diagram of the support on the stator;
[0052] Figure 18This is a top view of the first shaft support;
[0053] Figure 19 Top view of the motor;
[0054] Figure 20 yes Figure 19 The cross-sectional view of the motor shown in the image;
[0055] Figure 21 yes Figure 19 A cross-sectional view of the motor at another location shown in the image;
[0056] Figure 22 yes Figure 19 A schematic diagram of the stator support shown in the figure;
[0057] Figure 23 yes Figure 19 A schematic diagram of the first shaft support;
[0058] Figure 24 This is another sectional view of the motor;
[0059] Figure 25 This is another sectional view of the motor;
[0060] Figure 26 This is a cross-sectional view of a food processor shown in an exemplary embodiment of this application;
[0061] Figure 27 This is a cross-sectional view of a food processor shown in yet another exemplary embodiment of this application. Detailed Implementation
[0062] 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.
[0063] 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 movements between 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.
[0064] Please refer to Figure 1 and Figure 2 , Figure 1This is a schematic diagram of the top of the motor 100 shown in an exemplary embodiment of this application. Figure 2 yes Figure 1 A schematic diagram of the bottom of the motor 100 is shown in the figure.
[0065] This application provides an electric motor 100, which includes a stator assembly 10, a rotor assembly 20, a first shaft bracket 30, and a second shaft bracket 40. The stator assembly 10 is arranged around the outside of the rotor assembly 20 and is coaxially arranged. The rotor assembly 20 is rotatable relative to the stator assembly 10, and an air gap is provided between the stator assembly 10 and the rotor assembly 20.
[0066] The rotor assembly 20 includes a rotor shaft 21 capable of outputting torque, which is rotatably supported on a first shaft bracket 30 and a second shaft bracket 40. Both the first shaft bracket 30 and the second shaft bracket 40 are connected to the stator assembly 10 and are spaced apart at both ends of the stator assembly 10 along the axial direction of the rotor shaft 21. The rotor shaft 21 can be supported on the first shaft bracket 30 and the second shaft bracket 40 by bearings. It should be noted that one of the first shaft bracket 30 and the second shaft bracket 40 serves as the upper shaft bracket, and the other as the lower shaft bracket. This application uses the first shaft bracket 30 as the upper shaft bracket and the second shaft bracket 40 as the lower shaft bracket as an example for description. It should also be noted that the motor 100 may selectively employ at least one of the first shaft bracket 30 and the second shaft bracket 40.
[0067] Please refer to Figures 3 to 6 , Figure 3 for Figure 1 An exploded view of the stator assembly 10 shown in the figure. Figure 4 This is a schematic diagram of the stator support 111. Figure 5 This is a schematic diagram of the stator lower support 112. Figure 6 This is a sectional view of stator assembly 10.
[0068] The stator assembly 10 includes a stator support 11, a stator core 12, and a stator winding 13, both of which are assembled on the stator support 11. The stator support 11 is hollow, forming a cavity 110 in the hollow space.
[0069] exist Figure 3 In the illustrated embodiment, the stator support 11 includes a detachably connected upper stator support 111 and a lower stator support 112, with the upper stator support 111 positioned above the lower stator support 112. Both the upper stator support 111 and the lower stator support 112 are hollow.
[0070] The stator core 12 is clamped and fixed between the upper stator support 111 and the lower stator support 112, and the clamping method is not limited. In this embodiment, the stator winding 13 is wound around the upper stator support 111 and the lower stator support 112. Through the winding force of the enameled wire in the stator winding 13, the upper stator support 111 and the lower stator support 112 are kept relatively fixed in the axial direction of the rotor shaft 21, and the stator core 12 is clamped. The direction of the clamping force is consistent with the axial direction of the rotor shaft 21. In this way, there is no need to use fasteners to fix the upper stator support 111 and the lower stator support 112, and the structure is simplified.
[0071] Of course, the structure of the stator assembly 10 is not limited to that described above. In some other embodiments, the stator support 11 can be integrally formed with the stator core 12 by injection molding. For example, the stator core 12 can be used as an insert and injection molded into the stator support 11, and then the stator winding 13 can be wound around the stator support 11.
[0072] In one embodiment, such as Figure 3 As shown, the stator winding 13 includes multiple coils 130, which can be connected in series or in parallel. Figure 4 and Figure 5 As shown, the upper stator support 111 has multiple evenly distributed upper coil holes 1111 around its hollow portion and upper spacers 1112 separating adjacent upper coil holes 1111. The lower stator support 112 has multiple evenly distributed lower coil holes 1121 around its hollow portion and lower spacers 1122 separating adjacent lower coil holes 1121. The upper spacers 1112 and lower spacers 1122 correspond one-to-one along the axial direction of the rotor shaft 21. Each coil 130 is wound around a pair of upper spacers 1112 and lower spacers 1122 that are opposite each other. This arrangement allows multiple coils 130 to fix the upper stator support 111 and lower stator support 112 at multiple locations, resulting in a more uniform clamping force on the stator core 12 and ensuring uniform spacing between adjacent coils 130, thus providing adequate heat dissipation. The number of coils 130 is unlimited and can be selected according to actual needs.
[0073] In one embodiment, such as Figure 4 As shown, the upper stator support 111 is also provided with an upper flange 1113 along the edge of the upper coil hole 1111. The upper flange 1113 protrudes along the axial direction of the rotor shaft 21 toward the side facing the lower stator support 112. The upper flange 1113 can define the shape of the coil 130 when wound on the upper spacer 1112, ensuring that an appropriate gap is reserved inside the coil 130.
[0074] In one embodiment, such as Figure 5As shown, the lower stator support 112 is further provided with a lower flange 1123 along the edge of the lower coil hole 1121. The lower flange 1123 protrudes along the axial direction of the rotor shaft 21 toward the side facing the upper stator support 111. The lower flange 1123 can define the shape of the coil 130 when wound on the lower spacer 1122, ensuring that an appropriate gap is reserved inside the coil 130.
[0075] In one embodiment, such as Figure 4 and Figure 5 As shown, in the embodiment where the stator support 11 includes an upper stator support 111 and a lower stator support 112, both the upper stator support 111 and the lower stator support 112 are hollow. The hollow portion of the upper stator support 111 forms an upper cavity 1110, and the hollow portion of the lower stator support 112 forms a lower cavity 1120. The upper cavity 1110 and the lower cavity 1120 together constitute cavity 110. Multiple upper coil holes 1111 communicate with the upper cavity 1110, and these connections can be used for wiring. Multiple lower coil holes 1121 communicate with the lower cavity 1120, and these connections can also be used for wiring. Please refer to... Figure 6 The stator core 12 also includes a plurality of stator teeth 120 extending toward the hollow portion of the stator support 11. The stator teeth 120 have a cantilever structure and are located between the upper spacer 1112 and the lower spacer 1122. The coil 130 is also arranged around the stator teeth 120. The stator core 12 is composed of a plurality of laminated laminations, which can be made of silicon steel sheets.
[0076] Please refer to Figure 7 and Figure 8 , Figure 7 This is an exploded view of rotor assembly 20. Figure 8 This is a cross-sectional view of rotor assembly 20.
[0077] The rotor assembly 20 also includes a rotor support 22, a rotor core 23, and magnets 24. In one embodiment, the rotor support 22 includes an upper rotor support 221 and a lower rotor support 222 connected to each other. The rotor core 23 and magnets 24 are clamped between the upper rotor support 221 and the lower rotor support 222, with the clamping force directed in the same direction as the axial direction of the rotor shaft 21. The rotor core 23 is hollow, and the rotor shaft 21 passes through the upper rotor support 221, the lower rotor support 222, and the rotor core 23. The rotor shaft 21 is fixedly connected to the rotor core 23 at the hollow portion of the rotor core 23, and the connection method includes, but is not limited to, a transition fit through a shaft hole. For example, the rotor core 23 has magnet slots, and magnets 24 are assembled within these slots. The rotor core 23 is composed of multiple stacked laminations, which can be made of silicon steel. The rotor structure is simple and compact.
[0078] The upper rotor support 221 and the lower rotor support 222 can be riveted together with rivets 25, thereby using the riveting force to provide clamping force for the rotor core 23 and the magnet sheet 24. Multiple rivets 25 can be provided, and the number is not limited. In some other embodiments, the upper rotor support 221 and the lower rotor support 222 can also be fixed together with screws.
[0079] To prevent axial movement of the rotor shaft 21, the rotor assembly 20 further includes a first limiting member 26 and / or a second limiting member 27. The first limiting member 26 connects the upper rotor support 221 to the rotor shaft 21, and the second limiting member 27 connects the lower rotor support 222 to the rotor shaft 21. Specifically, the rotor shaft 21 is provided with a first slot 211 and / or a second slot 212 spaced apart along the axial direction. The first limiting member 26 is engaged in the first slot 211, and the second limiting member 27 is engaged in the second slot 212, thus achieving axial positioning of the rotor shaft 21. In this embodiment, the rotor assembly 20 includes a first limiting member 26 and a second limiting member 27. The first limiting member 26 and the second limiting member 27 can be spring clips, but are not limited to this.
[0080] Please combine Figure 1 , Figure 4 , Figure 5 and Figure 9 , Figure 9 This is a cross-sectional view of motor 100.
[0081] As previously described, the stator support 11 is hollow, forming a cavity 110 in the hollow portion, and the stator winding 13 is arranged around the cavity 110. The rotor assembly 20 is assembled within the cavity 110 and can rotate relative to the stator support 11.
[0082] The first shaft bracket 30 is connected to the stator support 11 and is located at one end of the stator support 11 in the axial direction of the rotor shaft 21, at least partially within the cavity 110, and the rotor shaft 21 is rotatably supported by the first shaft bracket 30. Figure 9 In the embodiment shown, the rotor shaft 21 is supported on the first shaft frame 30 by the first bearing 50.
[0083] In one embodiment, such as Figure 9As shown, the first shaft bracket 30 is disposed within the cavity 110. The first shaft bracket 30 includes a central region 301 through which the rotor shaft 21 passes and an edge region 302 surrounding the central region 301. At one end of the first shaft bracket 30, the edge region 302 does not extend beyond the outermost end face of the stator support 11 along the axial direction of the rotor shaft 21; that is, the edge region 302 of the first shaft bracket 30 does not extend beyond the upper end face of the stator upper support 111. In this way, the first shaft bracket 30 does not increase the axial dimension of the motor 100 at the edge, making the structure of the motor 100 more compact and facilitating the thinning of the motor 100. It should be noted that the first shaft bracket 30 is only locally thickened in the central region 301 to accommodate the first bearing 50 and ensure the strength of the first shaft bracket 30 at this location.
[0084] It should be noted that the outer end face 3020 of the edge region 302 can be flush with the outermost end face 1101 of the stator support 11 at that end. Alternatively, along the axial direction of the rotor shaft 21, the distance between the outer end face 3020 of the edge region 302 and the outermost end face 1101 of the stator support 11 at that end can be set to no more than -3 / 10 of the overall axial dimension L of the stator assembly 10. Here, the negative sign in "-3 / 10" means that the outer end face 3020 of the edge region 302 is lower than the outermost end face 1101 of the stator support 11 at that end. Specifically, the outer end face 3020 of the edge region 302 can be set to protrude beyond the outermost end face 1101 of the stator support 11 at that end, with a protrusion dimension not exceeding 4mm.
[0085] In one embodiment, in the orthographic projection along the axial direction of the rotor shaft 21, the projection area of the stator winding 13 surrounds the periphery of the projection area of the first shaft bracket 30. This arrangement ensures that the outer contour of the first shaft bracket 30 does not extend beyond the stator winding, thus preventing obstruction of the stator winding 13 and hindering heat dissipation, thereby improving the heat dissipation effect of the motor 100. Furthermore, the first shaft bracket 30 does not wrap around the outside of the stator assembly 10, thus not increasing the radial dimension of the motor 100.
[0086] In one embodiment, in the orthographic projection, the projection of the first shaft bracket 30 is also located within the projection of the cavity 110. This arrangement ensures that the outer contour of the first shaft bracket 30 does not extend beyond the cavity 110, further reducing the radial dimension of the first shaft bracket 30, resulting in a smaller size and lighter weight, and lower material costs. Figure 9 As shown, the inner diameter of cavity 110 is D1, and the outer diameter of the first shaft bracket 30 is D2, where D1 ≥ D2.
[0087] Please continue to refer to this. Figure 9In one embodiment, the motor 100 further includes a second shaft bracket 40 connected to the stator support 11. The second shaft bracket 40 is spaced apart from the first shaft bracket 30 in the axial direction of the rotor shaft 21 and is at least partially located within the cavity 110. The rotor shaft 21 is also rotatably supported on the second shaft bracket 40. The rotor shaft 21 can be supported on the second shaft bracket 40 by a second bearing 60. With this configuration, the second shaft bracket 40 and the first shaft bracket 30 can jointly support the rotor shaft 21, improving the stability of the rotor shaft 21 during rotation.
[0088] In one embodiment, at the end where the second shaft bracket 40 is located, along the axial direction of the rotor shaft 21, the distance between the outer end face 4001 of the second shaft bracket 40 and the outermost end face 1102 of the stator support 11 at that end is -3 / 10 to 1 / 5 of the overall axial dimension L of the stator assembly 10. Here, the negative sign in "-3 / 10" indicates that the outer end face 4001 of the second shaft bracket 40 is lower than the outermost end face 1102 of the stator support 11 at that end. With this configuration, the outer end face 4001 of the second shaft bracket 40 is recessed into the cavity 110 along the axial direction of the rotor shaft 21, or flush with the outermost end face 1102 of the stator support 11, or protrudes outside the cavity 110. Since the protruding dimension is no greater than 1 / 5 of the overall axial dimension L of the stator assembly 10, the second shaft bracket 40 will not excessively increase the axial dimension of the motor 100, which is beneficial for achieving a thinner motor 100.
[0089] exist Figure 9 In the embodiment shown, at the end where the second shaft bracket 40 is located, the outer end face 4001 of the second shaft bracket 40 does not extend beyond the outermost end face 1102 of the stator support 11 at that end, that is, the second shaft bracket 40 does not extend beyond the lower end face of the stator lower support 112.
[0090] In some other embodiments, the outer end face 4001 of the second shaft bracket 40 protrudes from the outermost end face 1102 of the stator bracket 11, and the protrusion dimension is no greater than 4mm.
[0091] In an alternative embodiment, in the orthogonal projection along the rotor shaft 21, the projection area of the stator winding 13 surrounds the periphery of the projection area of the second shaft bracket 40. That is, the second shaft bracket 40 does not wrap around the outside of the stator assembly 10, nor does it obstruct the stator winding 13, thus not increasing the radial dimension of the motor 100, nor hindering the heat dissipation of the stator winding 13.
[0092] exist Figure 9In the illustrated embodiment, the projection of the second shaft bracket 40 lies within the projection of the cavity 110. That is, the outer contour of the second shaft bracket 40 does not extend beyond the cavity 110. This design results in a relatively small radial dimension of the second shaft bracket 40, leading to a smaller size and lighter weight, further reducing material costs. Figure 9 As shown, the inner diameter of cavity 110 is D1, and the outer diameter of second shaft bracket 40 is D3, where D1 ≥ D3. For example, D3 = D2, but it is not limited to this.
[0093] Please combine Figure 4 , Figures 10 to 11 , Figure 10 for Figure 9 A magnified view of part A in the middle. Figure 11 This is a schematic diagram of the first shaft bracket 30 inverted.
[0094] The connection between the first shaft bracket 30 and the stator support 11 includes, but is not limited to, a detachable connection. In this embodiment, the first shaft bracket 30 and the stator support 11 are snap-fitted together. Specifically, the first shaft bracket 30 includes a connecting flange 31 protruding along the axial direction of the rotor shaft 21, and the connecting flange 31 is connected to the stator support 11 within the cavity 110. Exemplarily, the connecting flange 31 is provided with multiple snap-fit portions, such as first snap-fit feet 303, and the stator support 11 is provided with multiple snap-fit mating portions, such as first snap-fit grooves 1114. The multiple first snap-fit feet 303 are snapped into the first snap-fit grooves 1114 one-to-one, and the snap-fit force is consistent with the axial direction of the rotor shaft 21. More precisely, the stator support 111 is provided with multiple first snap-fit grooves 1114. A first bearing 50 is installed in the hollow portion of the first shaft bracket 30. It should be noted that the snap-fit structure between the first shaft bracket 30 and the stator support 11 is not limited to those described above.
[0095] Please combine Figure 5 and Figure 12 , Figure 12 This is a schematic diagram of the second shaft bracket 40.
[0096] The connection between the second shaft bracket 40 and the stator support 11 includes, but is not limited to, a detachable connection. In this embodiment, the second shaft bracket 40 and the stator support 11 are snapped together. Specifically, the second shaft bracket 40 may have multiple second locking feet 401, and the stator support 11 may have multiple second locking slots 1124. The multiple second locking feet 401 are snapped into the second locking slots 1124 one-to-one, and the snapping force is consistent with the axial direction of the rotor shaft 21. More precisely, the lower stator support 112 has multiple second locking slots 1124. A second bearing 60 is installed in the hollow part of the second shaft bracket 40. It should be noted that the snapping structure between the second shaft bracket 40 and the stator support 11 is not limited to those described above.
[0097] Please refer to Figure 13 , Figure 13This is a cross-sectional view of a motor 100 shown in yet another embodiment of this application.
[0098] In one embodiment, the rotor shaft 21 is supported on the stator bracket 11 by a first bearing 50 and a second bearing 60. The motor 100 also includes a first axial limiting member 70. The rotor shaft 21 is rotatably supported on the first shaft frame 30 by the first bearing 50. The first axial limiting member 70 is assembled to the rotor shaft 21 and is positioned at the outer axial end of the first bearing 50, thus axially limiting the first bearing 50. Specifically, a groove can be provided on the rotor shaft 21 so that the first axial limiting member 70 is engaged in the groove, but this is not limited to this. The first axial limiting member 70 can be a retaining ring.
[0099] The motor 100 may further include a second axial limiting member 80. The rotor shaft 21 is rotatably supported on the second shaft frame 40 via a second bearing 60. The second axial limiting member 80 is assembled to the rotor shaft 21 and is positioned at the outer axial end of the second bearing 60, thus achieving axial limiting of the second bearing 60. Specifically, a groove can be provided on the rotor shaft 21 so that the second axial limiting member 80 is engaged in the groove, but this is not limited to this. The second axial limiting member 80 may be a retaining ring.
[0100] Please refer to Figure 14 , Figure 14 See Figure 13 A schematic diagram of motor 100 is shown in the figure.
[0101] The first shaft bracket 30 and the stator support 11 can also remain relatively fixed in the circumferential direction around the rotor shaft 21. In one embodiment, the first shaft bracket 30 has a protrusion 3021 at its edge, and the stator support 11 has a groove 113. The groove 113 is recessed radially along the rotor shaft 21, and the protrusion 3021 cooperates with the groove 113 to limit its movement in the circumferential direction. Of course, the protrusion 3021 can be provided on the stator support 11, and the groove 113 can be correspondingly provided on the first shaft bracket 30. It should be noted that the second shaft bracket 40 and the stator support 11 can also remain relatively fixed in the circumferential direction around the rotor shaft 21. For details, please refer to the above structure, which will not be repeated here.
[0102] Please refer to Figures 15 to 18 , Figure 15 This is a top view of motor 100. Figure 16 for Figure 15 The cross-sectional view of the motor 100 shown in the figure. Figure 17 This is a schematic diagram of the stator support 111. Figure 18 This is a top view of the first shaft bracket 30.
[0103] exist Figure 15 and Figure 16 In the illustrated embodiment, the connecting flange 31 is connected to the stator upper bracket 111 by screws 14, the specific number of which is not limited. Specifically, as shown... Figure 17 and Figure 18 As shown, the connecting flange 31 has a countersunk hole 311, and the stator upper bracket 111 has a threaded hole 1116. The countersunk hole 311, the threaded hole 1116, and the rotor shaft 21 are axially aligned. The countersunk hole 311 and / or the threaded hole 1116 are configured as open holes with notches on the sides, such as semi-circular holes. The threaded hole 1116 is threadedly engaged with the screw 14. In this embodiment, the countersunk hole 311 is configured as an open semi-circular hole, and the threaded hole 1116 is configured as a complete circular hole. The screw 14 is supported on the stepped surface of the countersunk hole 311 and locked in the threaded hole 1116. The direction of the applied connecting force is aligned with the axial direction of the rotor shaft 21. The countersunk hole 311 is configured as an open hole, which reduces the space occupied on the connecting flange 31 and makes the installation more convenient.
[0104] Multiple countersunk holes 311 and threaded holes 1116 can be provided, and they are spaced apart around the rotor shaft 21 in the upward direction, which can increase the balance of the connection force.
[0105] Please refer to Figures 19 to 23 , Figure 19 This is a top view of motor 100. Figure 20 for Figure 19 The cross-sectional view of the motor 100 shown in the figure. Figure 21 for Figure 19 A cross-sectional view of the motor 100 at another location shown in the figure. Figure 22 for Figure 19 A schematic diagram of the upper support 111 of the middle stator. Figure 23 for Figure 19 A schematic diagram of the first shaft bracket 30.
[0106] exist Figures 19 to 23 In the illustrated embodiment, the connecting flange 31 is threadedly connected to the stator upper bracket 111. Specifically, as shown... Figure 22 and Figure 23 As shown, the inner surface of the hollow part of the stator upper bracket 111 is provided with an internal thread 1117, and the connecting flange 31 is provided with an external thread 312. The internal thread 1117 and the external thread 312 are threadedly engaged.
[0107] exist Figure 22 and Figure 23In the illustrated embodiment, the motor 100 further includes an anti-loosening structure located at the threaded connection between the connecting flange 31 and the stator upper bracket 111. The anti-loosening structure engages with the connecting flange 31 in a limiting manner as the connecting flange 31 rotates out of the cavity 110. Thus, the connecting flange 31 and the stator upper bracket 111 are kept relatively fixed by the anti-loosening structure, preventing the connecting flange 31 from reversing and becoming loose from the stator upper bracket 111. This application does not specifically limit the implementation of the anti-loosening structure.
[0108] Exemplarily, the external thread 312 and / or the internal thread 1117 are provided with anti-rotation grooves 313, and the anti-loosening structure includes an anti-rotation baffle 15 inserted into the anti-rotation groove 313. In this embodiment, the external thread 312 is provided with an anti-rotation groove 313, which is recessed radially inward. The anti-rotation baffle 15 can be inserted upward from the bottom of the motor 100. Multiple anti-rotation grooves 313 and anti-rotation baffles 15 can be provided, with multiple anti-rotation baffles 15 inserted one-to-one into each anti-rotation groove 313, thus achieving circumferential limiting of the connecting flange 31. The structure is simple and easy to implement.
[0109] exist Figure 20 In the embodiment shown, the central region 301 of the first shaft bracket 30 is recessed into the cavity 110, thereby reducing the axial dimension of the first shaft bracket 30 in the central region 301.
[0110] exist Figure 20 In the illustrated embodiment, the motor 100 has only a first shaft bracket 30, which is located on the side of the stator support 11 facing the output end 210. The first shaft bracket 30 also includes a sleeve 32 located in the central region 301, which protrudes towards the side where the output end 210 is located. The sleeve 32 contains a first bearing 50 and a second bearing 60 that support the rotor shaft 21. In this way, multiple bearings are supported on the same side of the stator support 11, achieving multi-point support for the rotor shaft 21.
[0111] exist Figure 22In the illustrated embodiment, the upper stator support 111 is hollow, forming an upper cavity 1110. The upper stator support 111 also includes a plurality of upper coil holes 1111 distributed around the upper cavity 1110, with adjacent upper coil holes 1111 separated by an upper spacer 1112. Correspondingly, the lower stator support 112 is hollow, forming a lower cavity, and also includes a plurality of lower coil holes distributed around the lower cavity, with adjacent lower coil holes separated by a lower spacer. The upper coil holes 1111 and lower coil holes are aligned one-to-one, forming coil holes; the upper spacer 1112 and lower spacer are aligned one-to-one, forming spacers. The stator winding 13 passes through two adjacent coil holes and is wound around the spacer, thus fixing the upper stator support 111 and the lower stator support 112.
[0112] The stator core 12 includes multiple stator teeth (not shown in the figure) extending toward the hollow part of the stator support 11. The multiple stator teeth are accommodated in each interval in a corresponding manner. The stator core 12 is composed of multiple laminations, which can be made of silicon steel sheets or silicon steel sheets.
[0113] Please combine Figure 23 The first shaft bracket 30 further includes a shaft bracket body 33 connecting the sleeve 32 and the connecting flange 31. The connecting flange 31 and the sleeve 32 protrude from the shaft bracket body 33 in opposite directions. The shaft bracket body 33 is provided with weight-reducing holes 330. This reduces the weight of the first shaft bracket 30, achieving a lightweight design. Figure 13 In the embodiment shown, the shaft holder body 33 is circular, which is adapted to the shape of the cavity 110.
[0114] Please refer to Figure 24 , Figure 24 This is another sectional view of motor 100.
[0115] exist Figure 24 In the embodiment shown, the outer diameter of the shaft bracket body 33 is smaller than the inner diameter of the cavity 110. The shaft bracket body 33 extends beyond the outermost end face of the stator support 11 in the axial direction of the rotor shaft 21, with an extension dimension H not exceeding 4mm. Thus, while having a relatively small impact on the axial dimension of the motor 100, the thickness of the shaft bracket body 33 is appropriately increased to enhance its strength.
[0116] Please refer to Figure 25 , Figure 25 This is another sectional view of motor 100.
[0117] exist Figure 24In the illustrated embodiment, the outer diameter of the shaft bracket body 33 is larger than the inner diameter of the cavity 110. The shaft bracket body 33 also extends axially beyond the outermost end face of the stator support 11 of the rotor shaft 21, with the extension dimension H not exceeding 4 mm. This arrangement allows the shaft bracket body 33 to shield the outermost end face of the stator support 11. When the stator winding 13 is arranged around the cavity 110, the shaft bracket body 33 can be used to shield the stator winding 13, thus protecting it.
[0118] exist Figure 24 and Figure 25 In the illustrated embodiment, on the side where the first shaft bracket 30 is located, the outer end face of the shaft bracket body 33 is the outer end face 3020 of the edge region 302 of the first shaft bracket 30. This outer end face 3020 can be configured to protrude axially from the outermost end face 1101 of the stator assembly 10 at that end along the rotor shaft 21, and the protrusion dimension is not greater than 1 / 5 of the overall axial dimension L of the stator assembly 10. Specifically, it can be 1 / 6, 1 / 7, or 1 / 8 of the overall dimension L, but is not limited to this. This will not excessively increase the axial dimension of the motor 100.
[0119] Please refer to Figure 26 and Figure 27 , Figure 26 This is a cross-sectional view of a food processor 200 shown in an exemplary embodiment of this application. Figure 27 This is a cross-sectional view of a food processor 200 shown in yet another exemplary embodiment of this application.
[0120] This application also provides a food processor 200, which includes the motor 100 described above. Specifically, the food processor 200 includes a main unit 201 and a cup assembly 202, wherein the main unit 201 includes the motor 100, the cup assembly 202 includes a cup body 202a and a mixing blade 202b rotatably assembled to the cup body 202a, and the rotor shaft 21 of the motor 100 is drivenly connected to the mixing blade 202b to drive the mixing blade 202b to blend the ingredients.
[0121] exist Figure 26 In the illustrated embodiment, the rotor shaft 21 is fixedly connected to the blade shaft of the stirring blade 202b, and the cup assembly 202 is not detachable from the main unit 201. Figure 27 In the embodiment shown, the rotor shaft 21 is detachably connected to the blade shaft of the stirring blade 202b. Both the upper end of the rotor shaft 21 and the lower end of the stirring blade 202b are provided with clutches, which can be engaged or disengaged, thereby enabling the cup assembly 202 to be detachably connected to the main unit 201.
[0122] In one embodiment, the stator support 11 is provided with a plurality of mounting holes 114 (see reference). Figure 2The stator bracket 11 is fixed to the main unit 201 with screws at the mounting hole 114. In another embodiment, the first shaft bracket 30 is provided with external thread 3001 (see reference). Figure 13 The motor 100 can be fixed inside the main unit 201 by the external thread 3001.
[0123] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any 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. An electric motor, characterized in that, include: The stator assembly (10) includes a stator support (11) and a stator winding (13) assembled on the stator support (11). The stator support (11) is hollow and a cavity (110) is formed in the hollow part. The stator winding (13) is distributed around the cavity (110). A rotor assembly (20) is disposed within the cavity (110), the rotor assembly (20) including a rotor shaft (21) extending from the cavity (110); A first shaft bracket (30) is connected to one end of the stator support (11) along the axial direction of the rotor shaft (21) and is at least partially located within the cavity (110). The rotor shaft (21) is rotatably supported on the first shaft bracket (30). The first shaft bracket (30) includes a central region (301) through which the rotor shaft (21) passes and an edge region (302) surrounding the central region (301). At the end where the first shaft bracket (30) is located, the distance between the outer end face (3020) of the edge region (302) and the outermost end face (1101) of the stator support (11) at that end in the axial direction of the rotor shaft (21) is (-3 / 10) to (1 / 5) of the overall dimension of the stator assembly (10) in that axial direction.
2. The motor according to claim 1, characterized in that, In the orthographic projection along the axial direction of the rotor shaft (21), the projection area of the stator winding (13) surrounds the periphery of the projection area of the first shaft frame (30).
3. The motor according to claim 1, characterized in that, The first shaft bracket (30) is detachably connected to the stator bracket (11); and / or The first shaft bracket (30) is engaged with the stator bracket (11); and / or The first shaft bracket (30) is provided with a countersunk hole (311), and the stator bracket (11) is provided with a threaded hole (1116). The countersunk hole (311), the threaded hole (1116), and the rotor shaft (21) are axially aligned. The countersunk hole (311) and / or the threaded hole (1116) are configured as open holes with notches on the sides. A screw (14) passes through the countersunk hole (311) and engages with the threaded hole (1116); and / or The first shaft bracket (30) is threadedly connected to the stator bracket (11). The motor (100) also includes an anti-loosening structure provided at the threaded connection between the first shaft bracket (30) and the stator bracket (11). In the direction in which the first shaft bracket (30) is screwed out of the cavity (110), the anti-loosening structure is limited and engaged with the first shaft bracket (30).
4. The motor according to claim 1, characterized in that, The first shaft bracket (30) is provided with multiple snap-fit parts, and the stator bracket (11) is provided with multiple snap-fit mating parts. The multiple snap-fit mating parts are located on the side surface of the stator bracket (11) facing the cavity (110) and are distributed circumferentially at intervals along the surface. The snap-fit parts and the snap-fit mating parts are snapped together one-to-one; and / or At the end where the first shaft bracket (30) is located, along the axial direction of the rotor shaft (21), the distance between the outer end face (3020) of the edge region (302) and the outermost end face (1101) of the stator bracket (11) at that end is not greater than 1 / 6 of the overall dimension of the stator assembly in that axial direction; or At the end where the first shaft bracket (30) is located, along the axial direction of the rotor shaft (21), the distance between the outer end face (3020) of the edge region (302) and the outermost end face (1101) of the stator bracket (11) at that end is no greater than 4 mm.
5. The motor according to claim 1, characterized in that, The stator support (11) includes a detachably connected upper stator support (111) and a lower stator support (112). The stator assembly (10) also includes a stator core (12). The stator core (12) is clamped and fixed between the upper stator support (111) and the lower stator support (112). The direction of the clamping force is consistent with the axial direction of the rotor shaft (21). The stator winding (13) is wound around the upper stator support (111) and the lower stator support (112) so that the upper stator support (111) and the lower stator support (112) clamp the stator core (12).
6. The motor according to claim 5, characterized in that, The stator winding (13) includes multiple coils. The upper stator support (111) is hollow. The upper stator support (111) has multiple evenly distributed upper coil holes (1111) and upper spacers (1112) that separate two adjacent upper coil holes (1111) around its hollow portion. The lower stator support (112) is hollow. The lower stator support (112) has multiple evenly distributed lower coil holes (1121) and lower spacers (1122) that separate two adjacent lower coil holes (1121) around its hollow portion. The upper spacers (1112) and the lower spacers (1122) are axially opposite each other on the rotor shaft (21). Each coil is wound around a pair of upper spacers (1112) and lower spacers (1122) that are axially opposite each other.
7. The motor according to claim 6, characterized in that, The upper stator support (111) is further provided with an upper flange (1113) protruding along the edge of the upper coil hole (1111), the upper flange (1113) protruding along the axial direction of the rotor shaft (21) toward the side facing the lower stator support (112); and / or The lower stator support (112) is also provided with a lower flange (1123) protruding along the edge of the lower coil hole (1121), the lower flange (1123) protruding along the axial direction of the rotor shaft (21) toward the side facing the upper stator support (111).
8. The motor according to claim 6, characterized in that, The plurality of upper coil holes (1111) are respectively connected to the cavities in the hollow portion of the upper stator support (111); and / or The plurality of lower coil holes (1121) are respectively connected to the cavity in the hollow part of the stator lower support (112).
9. The motor according to claim 1, characterized in that, The stator assembly further includes a first bearing (50) and a first axial limiting member (70). The rotor shaft (21) is rotatably supported on the first shaft frame (30) via the first bearing (50). The first axial limiting member (70) is assembled on the rotor shaft (21) and is positioned at the outer end of the first bearing (50) in the axial direction.
10. The motor according to claim 1, characterized in that, One of the first shaft bracket (30) and the stator bracket (11) is provided with a protrusion (3021) and the other is provided with a groove (113). The protrusion (3021) protrudes radially along the rotor shaft (21) and the groove (113) is recessed radially along the rotor shaft (21). The protrusion (3021) and the groove (113) cooperate.
11. The motor according to claim 1, characterized in that, The rotor assembly (20) further includes an upper rotor support (221), a lower rotor support (222), a rotor core (23), and a magnetic steel sheet (24). The rotor core (23) and the magnetic steel sheet (24) are clamped and fixed between the upper rotor support (221) and the lower rotor support (222). The magnetic steel sheet (24) is assembled on the rotor core (23). The rotor core (23) is hollow, and the rotor shaft (21) is fixedly connected to the rotor core (23) in the hollow part.
12. The motor according to claim 11, characterized in that, The rotor assembly (20) further includes a first limiting member (26) that connects the upper rotor bracket (221) to the rotor shaft (21); and / or The rotor assembly (20) further includes a second limiting member (27), which connects the rotor lower support (222) and the rotor shaft (21).
13. The motor according to claim 1, characterized in that, The rotor shaft (21) includes an output end (210) for outputting torque. The first shaft bracket (30) is located on the side of the stator bracket (11) facing the output end (210). The central region (301) forms a sleeve (32) protruding towards the output end (210). The sleeve (32) is provided with at least two bearings for supporting the rotor shaft (21).
14. The motor according to any one of claims 1 to 12, characterized in that, The motor (100) further includes a second shaft bracket (40) connected to the stator support (11). The second shaft bracket (40) is spaced apart from the first shaft bracket (30) along the axial direction of the rotor shaft (21) and is at least partially located within the cavity (110). The rotor shaft (21) is rotatably supported on the second shaft bracket (40). At one end of the second shaft bracket (40), along the axial direction of the rotor shaft (21), the distance between the outer end face (4001) of the second shaft bracket (40) and the outermost end face (1102) of the stator support (11) at that end is (-3 / 10) to (1 / 5) of the overall dimension of the stator assembly (10) in that axial direction.
15. The motor according to claim 14, characterized in that, In the orthogonal projection along the axial direction of the rotor shaft (21), the projection of the stator winding (13) surrounds the periphery of the projection area of the second shaft frame (40).
16. A food processor, characterized in that, The food processor includes a motor (100) as described in any one of claims 1 to 15.
17. The food processor according to claim 16, characterized in that, include; The host (201) includes the motor (100); A cup assembly (202) is assembled on the host (201). The cup assembly (202) includes a cup body (202a) and a stirring blade (202b). The stirring blade (202b) is rotatably assembled on the cup body (202a). The rotor shaft (21) of the motor (100) is connected to the stirring blade (202b) in a transmission connection.