A structurally stable food processing machine

Abstract

This utility model discloses a structurally stable food processing machine, including a motor, which includes a rotor assembly and a stator assembly. The rotor assembly includes a rotating shaft and a magnet. The magnet includes an inner magnet fixed to the rotating shaft and an outer magnet covering the outer periphery of the inner magnet. The outer periphery of the inner magnet has radially outward protrusions and radially inward recesses relative to the protrusions. The protrusions and recesses extend along the axial direction of the inner magnet. Multiple protrusions and recesses are provided and continuously alternately arranged along the circumference of the inner magnet. The outer magnet is integrally injection molded onto the protrusions and recesses. The outer magnet achieves a tight connection with the inner magnet through the protrusions and recesses, so that when the outer magnet transmits torque to the inner magnet, the protrusions and recesses enable the outer magnet to apply a positive forward thrust to the inner magnet, effectively preventing the outer magnet and the inner magnet from sliding relative to each other and separating when the rotating shaft is subjected to large torque.

Description

Technical Field

[0001] This utility model relates to the field of household appliance technology, specifically to a food processing machine with a stable structure. Background Technology

[0002] Existing food processors typically consist of a cup with a built-in crushing device and a motor located below the cup that drives the crushing device. When using the food processor, the user places the food into the cup, and the motor rotates at high speed, driving the crushing device to process the food. Currently, most food processors on the market use brushed motors, which are noisy and bulky. To reduce noise and achieve miniaturization, some manufacturers are using brushless motors in food processors. This effectively reduces noise and occupies less space, meeting the requirement for overall miniaturization. Existing brushless motors in food processors typically consist of a shaft, a balance weight, an iron core, and a permanent magnet. The ratio of the rotor's axial thickness H to its radial outer diameter R is often around 1, not within 0.5, resulting in a relatively high rotor axial height. This makes it impossible to achieve an extremely flat design for the motor and the entire machine. Furthermore, the permanent magnet is made of neodymium iron boron, and the price of the rare earth element neodymium continues to rise, increasing the motor's cost. To achieve a flattened design and reduce the cost of brushless motors, the applicant's earlier patent application CN202223180384.9 discloses a motor and a cleaning robot. This patent uses a novel brushless motor in the cleaning robot, comprising a stator assembly and a rotor assembly. The stator assembly is located within a housing and on the outer periphery of the rotor assembly. The rotor assembly includes a shaft and magnets fixed to the outside of the shaft. The magnets include an inner magnet and an outer magnet, with the outer magnet covering the outer periphery of the inner magnet. This type of brushless motor effectively reduces the overall axial height and has lower production costs. Those skilled in the art would readily conceive of applying this type of brushless motor in food processing machines to achieve an extremely flattened design for both the motor and the entire machine. However, the outer and inner magnets of this type of brushless motor are only injection molded as a single piece, and there is no limit structure between them. When the crushing device is processing ingredients that require a large torque, such as kneading dough, the shaft will be subjected to a large torque, and the inner magnet will also be subjected to a large reaction force. Meanwhile, the outer magnet still has a large forward driving force on the inner magnet. The outer and inner magnets will slide relative to each other, causing them to separate, which will lead to the motor being damaged and unable to rotate, seriously affecting the user experience. Utility Model Content

[0003] The purpose of this utility model is to provide a food processing machine with a stable structure, in order to solve the problem of how to prevent the inner magnet from sliding relative to the outer magnet and causing them to separate when the inner magnet is subjected to a large force, under the premise that the existing food processing machine sets the motor magnet as an inner magnet and an outer magnet covering the inner magnet to achieve the flattening of the motor.

[0004] To achieve the above objectives, this utility model provides a food processing machine with a stable structure, including a cup body with a built-in crushing device and a motor located below the cup body and driving the crushing device to rotate. The motor includes a rotor assembly and a stator assembly located on the outer periphery of the rotor assembly. The rotor assembly includes a rotating shaft and a magnet fixedly connected to the rotating shaft. The magnet includes an inner magnet fixedly connected to the rotating shaft and an outer magnet covering the outer periphery of the inner magnet. The outer periphery wall of the inner magnet has a radially outward protrusion and a radially inward recess relative to the protrusion. The protrusion and the recess extend along the axial direction of the inner magnet. There are multiple protrusions and recesses, which are continuously and alternately arranged along the circumference of the inner magnet. The outer magnet is integrally injection molded onto the protrusion and the recess.

[0005] This application sets the magnet of the motor rotor assembly to include an inner magnet fixed to the shaft and an outer magnet covering the outer periphery of the inner magnet. Compared with the structure of a single-layer magnet, this allows the magnetic strength of the magnet to be greatly increased when the motor size is fixed. This enables the motor to generate greater torque to drive the crushing device to rotate, improve the working performance of the food processing machine, and meet the user's needs. At the same time, the air gap magnetic field strength requirements of the motor can be met by adjusting the material, grade, and thickness of the two magnets, thus ensuring the stability of the food processing machine. Meanwhile, the outer peripheral wall of the inner magnet has radially outward protrusions and radially inward recesses relative to the protrusions. The outer magnet is integrally injection molded onto the protrusions and recesses. On the one hand, the protrusions and recesses on the outer peripheral wall of the inner magnet, when in close contact with the outer magnet, greatly improve the bonding strength between the two magnets. When the motor runs at high speed, the inner magnet drives the shaft to rotate, and the outer magnet achieves a tight bond with the inner magnet through the protrusions and recesses. This allows the outer magnet to apply a positive forward push to the inner magnet when transmitting torque to it, thanks to the protrusions and recesses. The protrusions and recesses allow for greater torque transmission to the inner magnet, effectively preventing a situation where, under high torque, the inner magnet experiences a similarly large reaction force while the outer magnet still exerts a significant forward driving force on it. This can lead to relative slippage between the inner and outer magnets, causing them to separate and potentially damaging the motor. Furthermore, the protrusions and recesses significantly increase the contact area between the inner and outer magnets, enhancing friction and preventing relative slippage. This ensures the motor's stability and durability under high loads, extending the equipment's lifespan. Additionally, the multiple protrusions and recesses, arranged continuously and alternately along the circumference of the inner magnet, greatly increase their number and density, further optimizing the connection between the inner and outer magnets, improving torque transmission efficiency, and ensuring stable motor operation under various conditions to meet the demands of high-efficiency food processing.

[0006] In a preferred embodiment of a structurally stable food processing machine, the radial distance L from the outermost end of the protrusion to the innermost end of the recess and the average radial thickness D of the outer magnet satisfy the following condition: 0.08≤L / D≤0.2.

[0007] Because the material of the outer magnet has shrinkage during injection molding on the outer peripheral wall of the inner magnet, with a shrinkage rate of about 1.5%, by setting the radial distance L from the outermost end of the protrusion to the innermost end of the recess and the average radial thickness D of the outer magnet to satisfy: 0.08≤L / D≤0.2, the maximum deformation rate requirement of the outer magnet can be met. This effectively avoids cracks caused by excessive shrinkage stress during cooling of the outer magnet after injection molding, which would lead to unstable connection between the outer and inner magnets and ultimately cause them to easily separate and fall off. This further improves the tightness of the bond between the inner and outer magnets.

[0008] In a preferred embodiment of a structurally stable food processing machine, both the protrusions and the recesses have arc-shaped cross-sections in the radial direction of the inner magnet, so as to form a wavy surface on the outer peripheral wall of the inner magnet.

[0009] By designing both the protruding and recessed portions with arc-shaped cross-sections in the radial direction of the inner magnet, a wavy surface is formed on the outer peripheral wall of the inner magnet. This not only ensures a tight bond between the inner and outer magnets but also further increases the contact area, thereby enhancing friction and ensuring smoother torque transmission during high-speed operation. It effectively prevents relative slippage between the inner and outer magnets, significantly improving the overall performance and reliability of the motor. Furthermore, the wavy surface allows for a smooth transition between the protruding and recessed portions, enabling complete bonding when the outer magnet is integrally injection molded onto the wavy surface. This avoids excessively small angles between the protruding and recessed portions, which could prevent the outer magnet from fitting tightly against the inner magnet during injection molding, resulting in an unstable bond and further ensuring a tight bond between the inner and outer magnets.

[0010] In a preferred embodiment of a structurally stable food processing machine, the curvature of the arc surfaces of the protrusions and the recesses is the same.

[0011] By setting the curvature of the arc surfaces of the protrusion and the recess to be the same, seamless connection between the protrusion and the recess at the connection position is ensured. This further ensures that the outer magnet can be tightly bonded to the inner magnet at all positions during the integral injection molding process, further guaranteeing the tightness of the bond between the inner and outer magnets and the stability of the overall structure, thereby improving the reliability of the motor under high load operation.

[0012] In a preferred embodiment of a structurally stable food processing machine, the included angle A between the line connecting the circumferential center of the protrusion to the center of the inner magnet and the line connecting the circumferential center of the recess to the center of the inner magnet satisfies: 3°≤A≤10°.

[0013] By ensuring that the angle A between the line connecting the circumferential center of the protrusion to the center of the inner magnet and the line connecting the circumferential center of the recess to the center of the inner magnet is 3°≤A≤10°, we can avoid the situation where the angle A is too small, causing the protrusion and recess to protrude too much while ensuring the bonding strength between the inner and outer magnets, resulting in an excessively large radial dimension of the entire magnet and an excessively large motor size. At the same time, we can also avoid the situation where the angle A is too large, causing the protrusion and recess to be too flat, resulting in a low bonding strength between the outer and inner magnets, which could ultimately lead to relative sliding between the inner and outer magnets.

[0014] In a preferred embodiment of a structurally stable food processing machine, both the protrusions and the recesses have rectangular cross-sections in the radial direction of the inner magnet; or,

[0015] Both the protruding and recessed portions have triangular cross-sections in the radial direction of the inner magnet.

[0016] In a preferred embodiment of a structurally stable food processing machine, the radius R1 of the outer magnet and the average radius R2 of the inner magnet satisfy: 0.2≤(R1-R2) / R1≤0.5.

[0017] By ensuring that the radius R1 of the outer magnet and the average radius R2 of the inner magnet satisfy the condition 0.2≤(R1-R2) / R1≤0.5, the problem of excessively thick outer magnets relative to inner magnets, leading to excessively high production costs for the entire motor, is avoided under the same motor radial dimensions. Simultaneously, the problem of excessively thin outer magnets relative to inner magnets, resulting in insufficient magnetic flux density in the rotor assembly and preventing the motor from outputting significant torque, is also avoided. These dimensional constraints satisfy the requirements for the fixing strength of the inner and outer magnets, the magnetic properties of the outer magnet, and provide the most cost-effective motor design guidelines, ensuring magnetic flux density while reducing production costs.

[0018] In a preferred embodiment of a structurally stable food processing machine, the radius R1 of the outer magnet and the axial height H of the outer magnet satisfy: 0.5≤H / R1≤1.4.

[0019] By setting the radius R1 and axial height H of the outer magnet to satisfy 0.5≤H / R1≤1.4, the following conditions are avoided: the axial height of the outer magnet is too large relative to its radius, resulting in an excessively thick overall axial height of the magnet and an excessively large axial dimension of the motor, which would affect the installation space; at the same time, the axial height of the outer magnet is not too small relative to its radius, resulting in an excessively thin overall axial height of the magnet, which would affect the magnetic performance and motor stability. This ensures that the motor can operate efficiently in a compact structure, balancing performance and cost, and improving overall processing efficiency.

[0020] In a preferred embodiment of a structurally stable food processing machine, the remanence of the outer magnet is not less than that of the inner magnet.

[0021] By setting the residual magnetism of the outer magnet to be no less than that of the inner magnet, preferably with the residual magnetism of the inner magnet being less than that of the outer magnet, the operating point of the inner magnet is higher than that of the single-layer magnet, which keeps the inner magnet away from the demagnetization inflection point. This helps to improve the overall irreversible demagnetization performance of the magnet, thereby ensuring the reliability of the motor under different temperature conditions.

[0022] In a preferred embodiment of a structurally stable food processing machine, a fan is also fixedly connected to the bottom of the inner magnet.

[0023] By fixing a fan to the bottom of the inner magnet, the inner magnet can drive the shaft to rotate while simultaneously driving the fan, serving a dual purpose and enhancing its functionality. Simultaneously, the fan allows for rapid heat dissipation from the motor's interior, effectively reducing temperature rise and ensuring the magnet's operational stability. This prevents unstable motor operation caused by magnetism degradation due to overheating. Optimized fan blade design further improves heat dissipation efficiency and extends the motor's lifespan. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0025] Figure 1 This is a cross-sectional view of a food processing machine according to one embodiment of the present invention;

[0026] Figure 2 This is a schematic diagram of the rotor assembly in one embodiment of the present invention;

[0027] Figure 3 This is a cross-sectional view of a rotor assembly in one embodiment of the present invention;

[0028] Figure 4 This is a schematic diagram of the rotor assembly from another angle in one embodiment of the present invention;

[0029] Figure 5 This is a cross-sectional view of the rotor assembly and fan in one embodiment of the present invention;

[0030] Figure 6 This is a schematic diagram of the rotor assembly and fan in one embodiment of the present invention.

[0031] List of components and reference numerals:

[0032] 1-Cup body; 2-Pulverizing device; 3-Motor; 31-Rotor assembly; 311-Shaft; 312-Outer magnet; 313-Inner magnet; 3131-Protrusion; 3132-Recess; 4-Fan. Detailed Implementation

[0033] To more clearly illustrate the overall concept of this utility model, a detailed description will be provided below with reference to the accompanying drawings.

[0034] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0035] like Figures 1 to 6 As shown, this utility model provides a structurally stable food processing machine, including a cup body 1 with a built-in crushing device 2 and a motor 3 disposed below the cup body 1 and driving the crushing device 2 to rotate. The motor 3 includes a rotor assembly 31 and a stator assembly disposed on the outer periphery of the rotor assembly 31. The rotor assembly 31 includes a rotating shaft 311 and a magnet fixedly connected to the rotating shaft 311. The magnet includes an inner magnet 313 fixedly connected to the rotating shaft 311 and an outer magnet covering the outer periphery of the inner magnet 313. The inner magnet 312 has a radially outward protrusion 3131 and a radially inward recess 3132 on the outer peripheral wall of the inner magnet 313. The protrusion 3131 and the recess 3132 extend along the axial direction of the inner magnet 313. There are multiple protrusions 3131 and recesses 3132, which are continuously and alternately arranged along the circumference of the inner magnet 313. The outer magnet 312 is integrally injection molded onto the protrusions 3131 and the recesses 3132.

[0036] This application sets the magnet of the rotor assembly 31 of the motor 3 to include an inner magnet 313 fixed to the rotating shaft 311 and an outer magnet 312 covering the outer periphery of the inner magnet 313. Compared with the structure of a single-layer magnet, this allows the motor 3 to greatly increase the magnetic strength of the magnet under a certain size, thereby enabling it to generate greater torque to drive the crushing device 2 to rotate, improving the working performance of the food processing machine and meeting the user's needs. At the same time, the air gap magnetic field strength requirements of the motor 3 can be met by adjusting the material, grade and thickness of the two magnets, ensuring the stability of the food processing machine. Meanwhile, the outer peripheral wall of the inner magnet 313 is provided with a radially outward protrusion 3131 and a radially inward recess 3132 relative to the protrusion 3131. The outer magnet 312 is integrally injection molded onto the protrusion 3131 and the recess 3132. On the one hand, the protrusion 3131 and the recess 3132 on the outer peripheral wall of the inner magnet 313 are tightly attached to the outer magnet 312, which can greatly improve the bonding strength between the two magnets. When the motor 3 runs at high speed, the inner magnet 313 drives the rotating shaft 311 to rotate. The outer magnet 312, through the tight combination of the protrusion 3131 and the recess 3132, enables the outer magnet 312 to transmit torque to the inner magnet 313. The protrusion 3131 and the recess 3132 enable the outer magnet 312 to transmit torque to the inner magnet 313. Applying a forward thrust to the inner magnet 313 allows for the transmission of greater torque, effectively preventing the inner magnet 313 from experiencing a large reaction force when the shaft 311 is subjected to a large torque, while the outer magnet 312 still exerts a large forward driving force on the inner magnet 313. This prevents relative sliding between the outer magnet 312 and the inner magnet 313, which could lead to separation and damage to the motor 3, preventing it from rotating. On the other hand, the presence of the protrusion 3131 and the recess 3132 greatly increases the contact area between the inner magnet 313 and the outer magnet 312, enhancing the friction between the magnets and effectively preventing relative sliding. This ensures the stability and durability of the motor 3 under high load operation and extends the service life of the equipment. In addition, both the protrusions 3131 and the recesses 3132 are provided in multiple alternating positions along the circumference of the inner magnet 313, which greatly increases the number and distribution density of the protrusions 3131 and the recesses 3132, further optimizes the bonding effect between the inner magnet 313 and the outer magnet 312, improves torque transmission efficiency, and ensures that the motor 3 can operate stably under various working conditions, meeting the needs of efficient food processing.

[0037] As a preferred embodiment of this application, such as Figure 4As shown, the radial distance L from the outermost end of the protrusion 3131 to the innermost end of the recess 3132 and the average radial thickness D of the outer magnet 312 satisfy: 0.08≤L / D≤0.2. Specifically, the average radial thickness of the outer magnet 312 refers to the distance from the radial center of the wall surface of the outer magnet 312 corresponding to the protrusion 3131 and the recess 3132 to the outer peripheral wall of the outer magnet 312.

[0038] Since the material of the outer magnet 312 has shrinkage during injection molding on the outer peripheral wall of the inner magnet 313, with a shrinkage rate of about 1.5%, by setting the radial distance L from the outermost end of the protrusion 3131 to the innermost end of the recess 3132 and the average radial thickness D of the outer magnet 312 to satisfy: 0.08≤L / D≤0.2, the maximum deformation rate requirement of the outer magnet 312 can be met. This effectively avoids cracks caused by excessive shrinkage stress during cooling of the outer magnet 312 after injection molding, which would lead to unstable connection between the outer magnet 312 and the inner magnet 313 and ultimately cause them to easily separate and fall off. This further improves the tightness of the bond between the inner magnet 313 and the outer magnet 312.

[0039] It should be noted that this application does not specifically limit the structure of the protrusion 3131 and the recess 3132, which can be any of the following embodiments:

[0040] Example 1: As Figure 4 As shown, in this embodiment, the protrusion 3131 and the recess 3132 are both arc-shaped in the radial direction of the inner magnet 313, so as to form a wavy surface on the outer peripheral wall of the inner magnet 313.

[0041] By setting the cross-sections of the protrusions 3131 and the recesses 3132 in the radial direction of the inner magnet 313 to be arc-shaped, a wave-like surface is formed on the outer peripheral wall of the inner magnet 313. While achieving a tight bond between the inner magnet 313 and the outer magnet 312, the wave-like surface structure can further increase the contact area, thereby further improving the friction force. This ensures smoother torque transmission during high-speed operation and effectively prevents relative sliding between the inner magnet 313 and the outer magnet 312, thereby significantly improving the overall performance and reliability of the motor 3. Furthermore, the wavy surface molding allows for a smooth transition between the protrusion 3131 and the recess 3132, enabling the outer magnet 312 to be fully bonded to the wavy surface during integral injection molding. This avoids an excessively small angle between the protrusion 3131 and the recess 3132, which would prevent the outer magnet 312 from fitting tightly against the inner magnet 313 during integral injection molding, thus preventing an unstable bond between the inner magnet 313 and the outer magnet 312. This further ensures a tight bond between the inner magnet 313 and the outer magnet 312.

[0042] Furthermore, such as Figure 4 As shown, the curvature of the arc surfaces of the protrusion 3131 and the recess 3132 is the same.

[0043] By setting the curvature of the arc surfaces of the protrusion 3131 and the recess 3132 to be the same, seamless docking of the protrusion 3131 and the recess 3132 at the connection position is ensured. This further ensures that the outer magnet 312 can be tightly bonded to the inner magnet 313 at all positions during integral injection molding, further guaranteeing the tightness of the bond between the inner magnet 313 and the outer magnet 312 and the stability of the overall structure, thereby improving the reliability of the motor 3 under high load operation.

[0044] Example 2: In this example, the protrusion 3131 and the recess 3132 are both rectangular in cross-section in the radial direction of the inner magnet 313.

[0045] Example 3: In this example, the protrusion 3131 and the recess 3132 are both triangular in cross-section in the radial direction of the inner magnet 313.

[0046] As a preferred embodiment of this application, such as Figure 4 As shown, the angle A between the line connecting the circumferential center of the protrusion 3131 to the center of the inner magnet 313 and the line connecting the circumferential center of the recess 3132 to the center of the inner magnet 313 satisfies: 3°≤A≤10°, and more preferably, A is 5°, 7° or 9°.

[0047] By ensuring that the included angle A between the line connecting the circumferential center of the protrusion 3131 to the center of the inner magnet 313 and the line connecting the circumferential center of the recess 3132 to the center of the inner magnet 313 satisfies 3°≤A≤10°, we avoid the situation where the included angle A is too small, causing the protrusion 3131 and the recess 3132 to protrude too much outward while ensuring the bonding strength between the inner magnet 313 and the outer magnet 312, resulting in an excessively large radial dimension of the entire magnet and an excessively large size of the motor 3; at the same time, we avoid the situation where the included angle A is too large, causing the protrusion 3131 and the recess 3132 to be too flat, resulting in a low bonding strength between the outer magnet 312 and the inner magnet 313, which would ultimately lead to relative sliding between the inner magnet 313 and the outer magnet 312.

[0048] As a preferred embodiment of this application, such as Figure 4 As shown, the radius R1 of the outer magnet 312 and the average radius R2 of the inner magnet 313 satisfy: 0.2≤(R1-R2) / R1≤0.5, preferably, (R1-R2) / R1=0.5, 0.3, 0.4 or 0.5.

[0049] By ensuring that the radius R1 of the outer magnet 312 and the average radius R2 of the inner magnet 313 satisfy 0.2≤(R1-R2) / R1≤0.5, the following constraints are avoided: the outer magnet 312 is too thick relative to the inner magnet 313 under the same radial dimensions of the motor 3, which would lead to excessively high production costs for the entire motor 3. Simultaneously, the outer magnet 312 is avoided being too thin relative to the inner magnet 313, which would result in insufficient magnetic flux density in the rotor assembly 31, preventing the motor 3 from outputting significant torque. These dimensional constraints satisfy the requirements for the fixing strength of the inner magnet 313 and the outer magnet 312, the magnetic properties of the outer magnet 312, and provide the most cost-effective design guidelines for the motor 3, ensuring magnetic flux density while reducing production costs.

[0050] As a preferred embodiment of this application, such as Figure 3 As shown, the radius R1 of the outer magnet 312 and the axial height H of the outer magnet 312 satisfy: 0.5≤H / R1≤1.4, and more preferably, H / R1=0.7, 1 or 1.2.

[0051] By setting the radius R1 and axial height H of the outer magnet 312 to satisfy 0.25≤H / R1≤0.7, the following conditions are avoided: the axial height of the outer magnet 312 is too large relative to its radius, resulting in an excessively thick overall axial height of the magnet and an excessively large axial dimension of the motor 3, which would affect the installation space. At the same time, the axial height of the outer magnet 312 is also avoided being too small relative to its radius, resulting in an excessively thin overall axial height of the magnet, which would affect the magnetic performance and stability of the motor 3. This ensures that the motor 3 can operate efficiently in a compact structure, balancing performance and cost, and improving overall processing efficiency.

[0052] It should be noted that this application does not specifically limit the relative relationship between the remanence of the outer magnet 312 and the inner magnet 313. As a preferred embodiment of this application, the remanence of the outer magnet 312 is not less than that of the inner magnet 313.

[0053] By setting the remanence of the outer magnet 312 to be no less than that of the inner magnet 313, preferably with the remanence of the inner magnet 313 being less than that of the outer magnet 312, the operating point of the inner magnet 313 is higher than that of the single-layer magnet, and the inner magnet 313 is further away from the demagnetization inflection point. This is beneficial to improving the overall irreversible demagnetization performance of the magnet, thereby ensuring the reliability of the motor 3 under different temperature conditions.

[0054] As a preferred embodiment of this application, such as Figure 5 , Figure 6 As shown, a fan 4 is also fixedly connected to the bottom of the inner magnet 313.

[0055] By fixing a fan 4 to the bottom of the inner magnet 313, the inner magnet 313 can drive the shaft 311 to rotate while simultaneously driving the fan 4 to rotate. This dual-purpose design enhances its functionality. Simultaneously, the fan 4 allows for rapid heat dissipation from the motor 3, effectively reducing temperature rise and ensuring the stability of the magnet's operation. This prevents unstable motor rotation caused by a decrease in magnetism due to excessive temperature. Furthermore, optimizing the fan 4 blade design improves heat dissipation efficiency and further extends the lifespan of the motor 3.

[0056] The technical solutions protected by this utility model are not limited to the above embodiments. It should be noted that any combination of the technical solutions of any embodiment with one or more other embodiments is within the protection scope of this utility model. Although this utility model has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this utility model are within the scope of protection claimed by this utility model.

Claims

1. A structurally stable food processing machine, comprising a cup body with a built-in crushing device and a motor disposed below the cup body and driving the crushing device to rotate, the motor comprising a rotor assembly and a stator assembly disposed on the outer periphery of the rotor assembly, the rotor assembly comprising a rotating shaft and a magnet fixedly connected to the rotating shaft, characterized in that, The magnet includes an inner magnet fixed to the rotating shaft and an outer magnet covering the outer periphery of the inner magnet. The outer periphery of the inner magnet has a radially outward protrusion and a radially inward recess relative to the protrusion. The protrusion and the recess extend along the axial direction of the inner magnet. There are multiple protrusions and recesses, which are continuously and alternately arranged along the circumference of the inner magnet. The outer magnet is integrally injection molded onto the protrusion and the recess.

2. A structurally stable food processor as claimed in claim 1, wherein The radial distance L from the outermost end of the protrusion to the innermost end of the recess satisfies the following condition with respect to the average radial thickness D of the outer magnet: 0.08 ≤ L / D ≤ ​​0.

2.

3. A structurally stable food processor as claimed in claim 1, wherein, Both the protrusion and the recess are arc-shaped in cross-section in the radial direction of the inner magnet, so as to form a wavy surface on the outer peripheral wall of the inner magnet.

4. A structurally stable food processor as claimed in claim 3, wherein The curvature of the protruding part and the concave part is the same.

5. A structurally stable food processor as claimed in claim 1, wherein, The angle A between the line connecting the circumferential center of the protrusion to the center of the inner magnet and the line connecting the circumferential center of the recess to the center of the inner magnet satisfies: 3°≤A≤10°.

6. A structurally stable food processor as claimed in claim 1, wherein, Both the protrusion and the recess have rectangular cross-sections in the radial direction of the inner magnet; or... Both the protrusion and the recess have triangular cross-sections in the radial direction of the inner magnet.

7. A structurally stable food processor as claimed in claim 1, wherein, The radius R1 of the outer magnet and the average radius R2 of the inner magnet satisfy the condition: 0.2≤(R1-R2) / R1≤0.

5.

8. A structurally stable food processor as claimed in claim 1, wherein, The radius R1 of the outer magnet and the axial height H of the outer magnet satisfy the following condition: 0.5≤H / R1≤1.

4.

9. A structurally stable food processor as claimed in claim 1, wherein, The remanence of the outer magnet is not less than that of the inner magnet.

10. The structurally stable food processor of claim 1, wherein, A fan is also fixedly connected to the bottom of the inner magnet.

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