Variable frequency motor for food processor and food processor

Abstract

The utility model relates to a variable frequency motor for a food processor and the food processor, and the variable frequency motor for the food processor comprises a rotor assembly which comprises a rotor shaft; the stator assembly is arranged on the periphery of the rotor assembly and comprises a stator and a framework clamped outside the stator, and protrusions are formed on the side, away from the stator, of the framework; the outer shell is provided with an inner cavity for installing the stator assembly and the rotor assembly, the outer shell comprises an end plate covering the stator assembly and the rotor assembly and a side plate arranged in the circumferential direction of the end plate in a surrounding mode, the protrusion extends into the inner cavity, and the protrusion is matched with the inner end portion of the end plate and / or the inner side portion of the side plate. According to the technical scheme of the utility model, the motor shell and the framework are not easy to generate radial relative displacement, the motor shell and the framework can be stably matched, obvious resonance is not easy to generate, the noise is greatly reduced, and the coaxiality is also ensured.

Description

Technical Field

[0001] This utility model relates to the field of food processing machine technology, and in particular to a variable frequency motor for a food processing machine and a food processing machine. Background Technology

[0002] With the development of food processing machines, people are increasingly pursuing a higher quality user experience. Traditional food processing machines, limited by product pricing and simple drive requirements, often use series motors. However, series motors suffer from various problems, including large fluctuations in transmission efficiency, low axial heat dissipation efficiency, large frame size, and significant noise. To address these issues, conventional technical concepts have been broken, and brushless motors have begun to be adopted. However, most existing brushless motor stators have a cylindrical surface with a relatively smooth surface. When the motor rotates, the stator is subjected to electromagnetic forces. If there is no anti-rotation structure between the stator and the housing, the stator may rotate circumferentially.

[0003] Based on the solution to stator anti-rotation, application number CN201811579134.8, entitled "An Improved External Rotor Motor," discloses a structure of an inner stator and an outer rotor, with the end cover filled with a plastic sealant for fixing the stator core. However, the technical problem with this solution is that after the end cover and the stator core are plastic-sealed together, it is difficult to disassemble and repair the stator core, and it is easy to damage the original structure of the end cover and the stator core.

[0004] To address the problem of damage to the original structure of the stator core after the stator stops rotating, application number CN202221913998.0, entitled "A Brushless Motor," discloses the structure of an inner rotor and an outer stator. The stator core has an upper frame and a lower frame fixedly connected. The upper frame has an upper convex block, and the upper cover has an upper notch that engages with the upper convex block to prevent deflection between the upper frame and the upper cover. Alternatively, the lower frame has a lower convex block, and the lower cover has a lower notch that engages with the lower convex block to prevent deflection between the lower frame and the lower cover. However, the technical problem with this solution is that when the motor malfunctions and the rotor wobbles violently, the rotor may collide with the stator due to the small radial clearance between the rotor and the stator, causing the stator to move radially outward instantaneously. Since the notch is located on the outer side of the upper and lower covers (outer shells) and the outer side of the notch is open, the convex block and the notch are very likely to separate or shift at the moment the stator is impacted. This can cause the outer shell and the frame to undergo radial relative displacement, which may lead to significant resonance between the cover and the frame, generating noise and potentially affecting coaxiality.

[0005] The above-disclosed technical solutions all have the following technical problems: the outer shell and the frame may have radial relative displacement, affecting coaxiality and generating significant noise. Utility Model Content

[0006] The purpose of this utility model is to provide a variable frequency motor for a food processing machine and a food processing machine in order to solve the technical problem that the outer shell and frame may have radial relative displacement, affecting coaxiality and generating large noise.

[0007] To solve the above-mentioned technical problems, this utility model provides a variable frequency motor for a food processing machine, comprising:

[0008] Rotor assembly, including rotor shaft;

[0009] A stator assembly is disposed on the outer periphery of the rotor assembly, including a stator and a frame clamped outside the stator, wherein a protrusion is formed on the side of the frame away from the stator;

[0010] The outer casing has an inner cavity for mounting the stator assembly and the rotor assembly, including an end plate covering the stator assembly and the rotor assembly, and a side plate circumferentially surrounding the end plate. The protrusion extends into the inner cavity and engages with the inner end of the end plate and / or the inner side of the side plate.

[0011] Preferably, the inner cavity has an annular anti-rotation space between the end plate and the side plate, and the protrusion is located within the annular anti-rotation space.

[0012] Preferably, a slot is formed on the inner wall of the outer casing within the annular anti-rotation space, and the slot engages with the protrusion.

[0013] Preferably, a groove is formed between the inner end of the end plate and the inner side of the side plate, and the groove engages with the protrusion.

[0014] Preferably, the inner end face of the end plate and the inner side face of the side plate are both smooth surfaces, and the protrusion abuts against both the inner end face of the end plate and the inner side face of the side plate.

[0015] Preferably, the side plate has heat dissipation holes formed through it along its thickness direction, and the side plate has a perimeter disposed between the heat dissipation holes and the end plate, the inner wall surface of the perimeter abutting against the protrusion.

[0016] Preferably, the protrusion includes a body and a snap-fit ​​portion disposed on the side of the body away from the stator. The snap-fit ​​portion protrudes radially outward from the body, the side of the snap-fit ​​portion abuts against the inner wall of the outer casing, and the top surface of the snap-fit ​​portion and the top surface of the body abut against the inner end face of the outer casing.

[0017] Preferably, the stator includes a toothed portion with a winding and a yoke portion disposed outside the toothed portion, the skeleton is sleeved on the toothed portion and the yoke portion, and the protrusion is disposed on the radially outer side corresponding to the toothed portion and above the yoke portion.

[0018] Preferably, the protrusion extends through to form a wire hole along its thickness direction, and the variable frequency motor for the food processing machine also includes a wire electrically connected to the stator, with the side of the wire away from the stator passing through the wire hole.

[0019] This utility model also provides a food processing machine, including the aforementioned variable frequency motor for food processing machines, a main housing for mounting the variable frequency motor, and a blade assembly disposed outside the main housing. The rotor shaft in the rotor assembly passes through the main housing and is connected to the blade assembly in a transmission manner, and the protrusion extends toward the blade assembly.

[0020] The beneficial effects of this utility model are:

[0021] 1. The variable frequency motor for a food processing machine provided by this utility model comprises a rotor assembly disposed inside a stator assembly. A protrusion is formed on the side of the stator assembly's frame away from the stator, extending into the inner cavity of the outer casing. The protrusion engages with the inner end of the end plate and / or the inner side of the side plate. Based on this, the frictional resistance generated between the protrusion and the inner side of the outer casing prevents circumferential rotation of the frame, thereby preventing circumferential rotation of the stator held by the frame. Furthermore, the rotor assembly is disposed radially inside the stator assembly. When the rotor assembly... When there is a violent sway, even if the rotor may hit the stator assembly, the stator assembly will have an instantaneous tendency to move radially outward, and the stator with the frame will also have a tendency to move radially outward. However, since the protrusions on the frame extend into the inner cavity of the outer shell and abut against the inner wall of the outer shell, the inner wall of the outer shell will block the protrusions from moving radially outward, thus preventing the frame from moving radially outward. This makes it difficult for the outer shell and the frame to generate radial relative displacement, and the two can cooperate stably, making it less likely to generate obvious resonance, greatly reducing noise, and also ensuring coaxiality.

[0022] 2. Based on the fact that the inner cavity has an annular anti-rotation space between the end plate and the side plate, the protrusion is placed in the annular anti-rotation space. The annular anti-rotation space is located at the edge of the inner cavity and occupies only a small part of the axial volume of the inner cavity. The protrusion occupies only a small space in the axial direction of the inner cavity, which can achieve circumferential anti-rotation of the stator and allow the protrusion to be blocked by the end plate and the side plate, so that the fit between the frame and the outer shell is not prone to misalignment and ensures the stability of the fit between the two. In this way, the protrusion extends into the annular anti-rotation space in the axial direction, which not only occupies less axial space inside the motor, but also greatly reduces the radial dimension of the motor.

[0023] 3. A slot is formed on the inner wall of the outer shell within an annular anti-rotation space. The slot engages with the protrusion. Whenever the protrusion tends to move radially outward during operation, the slot encloses the protrusion, providing a counterforce and firmly holding it in place. This restricts the protrusion from radially displacing, ensuring stable installation between the outer shell and the frame. Consequently, the stator assembly held by the frame can be stably positioned, preventing radial disturbance of the rotor assembly that interacts with the stator assembly. In other words, the rotor shaft is also unlikely to experience radial disturbance, ensuring coaxiality and reducing noise while improving safety performance.

[0024] 4. Since the inner end face of the end plate and the inner side face of the side plate are both smooth surfaces, the protrusion directly abuts against the smooth surface. The outer shell does not have any slots to connect with the protrusion. This is because, due to the influence of manufacturing precision, the depth of the slots varies, which can lead to errors in the fit between multiple pairs of protrusions and slots. This can easily cause radial disturbances in the stator. The fit between the stator and rotor assembly in a variable frequency motor requires very high precision. Under the action of magnetic force, if the stator generates radial disturbances, the rotor assembly will also generate radial disturbances, thus affecting the coaxiality of the rotor shaft. In addition, the slots generally cannot fully engage the protrusion, and a part of the protrusion will protrude from the slots. Furthermore, the protrusion is prone to breakage when the stator tends to rotate circumferentially. However, by allowing the protrusion to directly contact the smooth surface of the outer casing, the circumferential rotation of the stator can be stopped by increasing the contact area between the protrusion and the smooth surface, and the protrusion can also be prevented from breaking. Secondly, since the protrusion abuts against the inner end face of the end plate and the inner side face of the side plate, the contact area between the protrusion and the outer casing can be increased, providing greater resistance when the stator tends to rotate circumferentially. At the same time, when the rotor assembly wobbles violently, even if the rotor may hit the stator, the side of the protrusion is blocked by the end plate, thus preventing the frame from moving radially outward.

[0025] 5. The protrusion includes a main body and a locking part that protrudes radially outward from the main body. The side of the locking part abuts against the inner wall of the outer shell, and the top surface of the locking part and the top surface of the main body abut against the inner end face of the outer shell. Based on this, when the rotor assembly experiences severe swaying and may impact the stator assembly, because the locking part protrudes radially outward from the side of the main body, the locking part acts on the side wall of the outer shell. The outer shell exerts a reaction force on the locking part radially inward, causing the locking part to tend to sway radially inward. At this time, the locking part exerts a force on the main body radially inward, and the main body abuts against the inner end face of the outer shell. The moving end of the main body is less likely to sway, and the reaction force on the locking part radially outward counteracts the force exerted by the outer shell on the locking part moving inward. Therefore, it can prevent the moving end of the protrusion from swaying inward after being impacted, prevent the protrusion from breaking, and prevent the protrusion from losing its circumferential anti-rotation function on the stator due to not being able to abut against the outer shell.

[0026] 6. The protrusion forms a through-hole for wires to pass through. This through-hole allows the wires to be neatly arranged within the housing, preventing them from getting tangled on the rotor and ensuring the normal operation of the variable frequency motor. On the other hand, the interaction between the rotor and stator assemblies generates magnetic lines of force. If the wires are damaged, these magnetic lines of force may cause electromagnetic interference, leading to incorrect or no signal transmission. By passing the wires through the protrusion, which is part of the frame and acts as an insulator, the protrusion isolates and shields part of the magnetic lines of force. Wires passing through the protrusion on both the inner and outer sides of its radial direction are protected from electromagnetic interference. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a cross-sectional schematic diagram of a variable frequency motor for a food processing machine in one embodiment of the present invention.

[0029] Figure 2 for Figure 1 The diagram shows the structure of the outer shell.

[0030] Figure 3 for Figure 1 The diagram shows the structure of the stator assembly.

[0031] Figure 4 for Figure 1 The diagram shows the structure of the stator.

[0032] Figure 5 This is a schematic diagram of the outer shell in another embodiment of the present invention.

[0033] Figure 6 This is a cross-sectional schematic diagram of a food processing machine according to an embodiment of the present utility model.

[0034] The names of the components shown in the diagram are as follows:

[0035] 1. Rotor assembly; 11. Rotor shaft; 21. Stator; 211. Tooth; 212. Yoke; 22. Frame; 221. Protrusion; 2211. Body; 2212. Snap-fit ​​part; 2213. Wire hole; 3. Outer shell; 31. Inner cavity; 32. End plate; 33. Side plate; 331. Heat dissipation hole; 332. Surrounding edge; 34. Slot; 4. Main housing; 5. Blade assembly. Detailed Implementation

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Please see Figures 1-5 A variable frequency motor for a food processing machine is disclosed, including a rotor assembly 1, a stator assembly 21, a housing 3, and wires.

[0038] The rotor assembly 1 includes a rotor shaft 11; the stator 21 assembly is disposed on the outer periphery of the rotor assembly 1, including a stator 21 and a frame 22 clamped outside the stator 21, the frame 22 having a protrusion 221 formed on the side away from the stator 21; the outer shell 3 has an inner cavity for mounting the stator assembly and the rotor assembly, including an end plate covering the stator assembly and the rotor assembly, and a side plate circumferentially surrounding the end plate, the protrusion extending into the inner cavity, the protrusion engaging with the inner end of the end plate and / or the inner side of the side plate.

[0039] It should be noted that multiple protrusions 221 can be provided, and the protrusions 221 can be distributed at intervals along the circumference of the frame 22. There are various ways in which the side plates and end plates of the outer shell cooperate with the protrusions. They can be smooth surfaces cooperating with the protrusions, or they can be grooves provided inside the outer shell cooperating with the protrusions, etc.

[0040] Understandably, on the one hand, the protrusion 221 engages with the inner end of the end plate of the outer casing 3 and / or the inner side of the side plate, and the frictional resistance generated between them can prevent the frame 22 from rotating circumferentially, thereby preventing the stator 21 held by the frame 22 from rotating circumferentially. On the other hand, the rotor assembly 1 is located radially inside the stator 21 assembly. When the rotor assembly 1 wobbles violently, even if the rotor may collide with the stator 21 assembly, the stator 21 assembly will have an instantaneous tendency to move radially outward, and the stator 21, along with the frame 22, will also have a tendency to move radially outward. However, since the protrusion 221 on the frame 22 extends into the inner cavity 31 of the outer casing 3, and the protrusion 221 abuts against the end plate and / or side plate, it will block the protrusion 221 from moving radially outward, thus preventing the frame 22 from moving radially outward. This makes it difficult for radial relative displacement to occur between the outer casing 3 and the frame 22, allowing them to cooperate stably, reducing the likelihood of significant resonance, greatly reducing noise, and ensuring coaxiality.

[0041] Specifically, the frame 22 has an upper frame 22 and a lower frame 22. The protrusion 221 can be provided on either the upper frame 22 or the lower frame 22. The outer shell 3 can include an upper end cover and a lower end cover. If the protrusion 221 is formed on the upper frame 22, it abuts against the inner wall of the upper end cover; if the protrusion 221 is formed on the lower frame 22, it abuts against the inner wall of the lower end cover. The outer shell 3 may not be in the form of two end covers fitting together; for example, it may be a cylindrical structure with a cover.

[0042] In one embodiment, such as Figures 2-4 As shown, the inner wall of the outer casing 3 has no grooves, and the protrusion 221 abuts against the inner side wall and inner top wall of the outer casing 3. The inner end face of the end plate 32 and the inner side face of the side plate 33 are both smooth surfaces, and the protrusion abuts against the inner end face of the end plate and the inner side face of the side plate.

[0043] Understandably, slots and protrusions are typically used to engage and engage the stator to prevent rotation. However, in this embodiment, the end plates and side plates of the outer casing 3 do not have any slots for the protrusions 221 to engage. Due to manufacturing precision limitations, the depth of the slots varies, which can lead to errors in the fit between multiple pairs of protrusions and slots. This can easily cause radial disturbances in the stator. The stator and rotor assembly in a variable frequency motor require very high precision. Under magnetic force, if the stator experiences radial disturbances, the rotor assembly will also experience radial disturbances, affecting the coaxiality of the rotor shaft. Furthermore, the slots generally cannot fully engage the protrusions 221, leaving a portion exposed. This makes the protrusions 221 prone to breakage when the stator 21 begins to rotate circumferentially. Allowing the protrusions 221 to directly contact the smooth surface of the outer casing 3 increases the contact area between the protrusions 221 and the smooth surface, achieving circumferential rotation prevention of the stator 21 and ensuring that the protrusions 221 do not breakage. Furthermore, when the rotor assembly 1 experiences severe swaying, even if the rotor might collide with the stator 21, the stator 21 will momentarily tend to move radially outward. The protrusion 221 on the frame 22 abuts against the smooth surface, which will prevent the protrusion 221 from moving radially outward. This prevents the frame 22 from moving radially outward, making it less likely for radial relative displacement to occur between the outer shell 3 and the frame 22. The two can cooperate stably, are less prone to significant resonance, greatly reduce noise, and ensure coaxiality. In addition, the protrusion 221 abuts against the end plate 32 and the side plate 33, which increases the contact area between the protrusion 221 and the outer shell 3. This provides greater resistance when the stator 21 tends to rotate circumferentially. At the same time, when the rotor assembly 1 experiences severe swaying, even if the rotor might collide with the stator 21, the side of the protrusion 221 is blocked by the end plate 32, thus preventing the frame 22 from moving radially outward.

[0044] In other embodiments, the protrusion may abut against the inner end face of the end plate, or the protrusion may abut against the inner side face of the side plate, i.e., the protrusion 221 may abut against either the inner side wall or the inner top wall of the outer casing 3. The outer casing 3 includes an end plate 32 covering the stator 21 assembly and the rotor assembly 1, and a side plate 33 circumferentially surrounding the end plate 32. The protrusion 221 abuts against the inner end face of the end plate 32, or the protrusion 221 abuts against the inner side face of the side plate 33.

[0045] It is understood that when the protrusion 221 abuts against the inner side of the side plate 33, there is frictional resistance between the protrusion 221 and the side plate 33. This frictional resistance will prevent the protrusion 221 from rotating circumferentially, thereby enabling the stator 21 held by the frame 22 to achieve circumferential anti-rotation. Furthermore, when the rotor assembly 1 wobbles violently, even if the stator 21 assembly has a momentary tendency to move radially outward, the frame 22 is blocked by the side plate 33, which can prevent the stator 21 from moving outward. Similarly, when the protrusion 221 abuts against the inner end of the end plate 32, there is frictional resistance between the protrusion 221 and the end plate 32. This frictional resistance will prevent the protrusion 221 from rotating circumferentially, thereby enabling the stator 21 held by the frame 22 to achieve circumferential anti-rotation. Secondly, when the stator 21 may move radially outward, the protrusion 221 on the frame 22 is located near the radial outer edge of the stator 21, that is, the gap between the protrusion 221 and the side plate 33 is very small. At this time, if the protrusion 221 is affected by the radial outward movement of the stator 21, since the protrusion 221 is very close to the side plate 33, the side plate 33 can still block the protrusion 221, avoid large misalignment between the protrusion 221 and the motor housing, and ensure the stability of the frame 22 installation.

[0046] like Figure 3 As shown, the specific structure of the protrusion 221 is as follows: the shape of the protrusion 221 can be "T-shaped", "7-shaped", etc., as long as the protrusion 221 and the inner wall of the outer shell 3 are tightly abutted. In this embodiment, the protrusion 221 includes a body 2211 and a snap-fit ​​portion 2212 disposed on the side of the body 2211 away from the stator 21. The snap-fit ​​portion 2212 protrudes radially outward from the body 2211. The side of the snap-fit ​​portion 2212 abuts against the inner side wall of the outer shell 3. The top surface of the snap-fit ​​portion 2212 and the top surface of the body 2211 both abut against the inner end face of the outer shell 3.

[0047] Understandably, when the rotor assembly 1 experiences severe swaying and may impact the stator 21, the locking part 2212 protrudes radially outward from the side of the body 2211. The locking part 2212 acts on the side wall of the outer shell 3, and the outer shell 3 exerts a radially inward reaction force on the locking part 2212. The locking part 2212 will tend to sway radially inward. At this time, the locking part 2212 exerts a radially inward force on the body 2211. The body 2211 abuts against the inner end face of the outer shell 3. The movable end of the body 2211 is not prone to swaying and will exert a radially outward reaction force on the locking part 2212, thus offsetting as much as possible the inward movement force exerted by the outer shell 3 on the locking part 2212. Therefore, it can prevent the movable end of the protrusion 221 from swaying inward after being impacted, prevent the protrusion 221 from breaking, and prevent the protrusion 221 from losing its circumferential anti-rotation function on the stator 21 because it cannot abut against the outer shell 3.

[0048] It should be noted that the protrusion 221 can abut against both the inner sidewall and the inner top wall of the outer shell 3, or it can abut against either the inner sidewall or the inner top wall of the outer shell 3.

[0049] Specifically, the inner cavity 31 has an annular anti-rotation space located between the end plate 32 and the side plate 33, and the protrusion 221 is located within the annular anti-rotation space. It should be noted that the annular anti-rotation space is located at the edge of the inner cavity 31. The protrusion may only abut against the side plate within the annular anti-rotation space, or it may only abut against the end plate within the annular anti-rotation space, or it may abut against both the end plate and the side plate within the annular anti-rotation space.

[0050] It is understandable that an annular anti-rotation space is provided between the included angle of the end plate 32 and the side plate 33. It is generally believed that the included angle of the end plate 32 and the side plate 33 can be 90° or approximately equal to 90°. The annular anti-rotation space is located at the edge of the inner cavity 31 and occupies only a small part of the axial volume of the inner cavity 31. The protrusion 221 occupies only a small space in the axial direction of the inner cavity 31, which can achieve circumferential anti-rotation of the stator 21 and allow the protrusion 221 to be blocked by the end plate 32 and the side plate 33, so that the fit between the frame 22 and the outer shell 3 is not prone to misalignment and ensures the stability of the fit between the two. In this way, the protrusion 221 extends into the annular anti-rotation space in the axial direction, which not only occupies less axial space inside the motor, but also greatly reduces the radial dimension of the motor.

[0051] More specifically, the side plate 33 has heat dissipation holes 331 extending through its thickness direction. The side plate 33 has a perimeter 332 located between the heat dissipation holes 331 and the end plate 32, and the inner wall surface of the perimeter 332 abuts against the protrusion 221. It can be understood that since the protrusion 221 abuts against both the side plate 33 and the end plate 32 simultaneously, the contact area between the protrusion 221 and the outer casing 3 is large. Even if the side plate 33 needs to have heat dissipation holes 331, only a portion of the perimeter 332 on the side plate 33 is needed to achieve circumferential anti-rotation of the protrusion 221 against the stator 21, while also meeting the heat dissipation requirements inside the motor.

[0052] In addition, such as Figures 3-4 As shown, the stator 21 includes a toothed portion 211 with a winding wound, and a yoke 212 disposed outside the toothed portion 211. The frame 22 is fitted over the toothed portion 211 and the yoke 212. The protrusion 221 is disposed radially outward of the toothed portion 211 and above the yoke 212. It can be understood that the protrusion 221, disposed radially outward of the winding, provides good blocking effect on the winding, effectively preventing the winding from moving radially outward due to loosening. Simultaneously, the protrusion 221 is disposed on the yoke 212 corresponding to the toothed portion 211, where the yoke 212 has good structural strength, allowing the protrusion 221 to be positioned more stably.

[0053] In addition, such as Figure 3 As shown, the protrusion 221 extends along its thickness to form a wire-passing hole 2213. The variable frequency motor for the food processing machine also includes a wire electrically connected to the stator 21. The side of the wire away from the stator 21 passes through the wire-passing hole 2213. It can be understood that when there are multiple protrusions 221, the wire-passing hole 2213 can be provided on some of the protrusions 221 or on all of the protrusions 221. One end of the wire is connected to the variable frequency motor, and the other end is connected to the control board inside the external main unit housing 4. The control board transmits signals through the wire to control the start and stop of the variable frequency motor. Passing the wires through the protrusion 221 allows them to be neatly arranged inside the housing 3, preventing them from getting tangled on the rotor and ensuring the normal operation of the variable frequency motor. At the same time, since the interaction between the rotor assembly 1 and the stator assembly 21 generates magnetic lines of force, if the wires are damaged, the magnetic lines of force may cause electromagnetic interference to the wires, resulting in incorrect signal transmission or failure to transmit. By passing the wires through the protrusion 221, and since the frame 22 is generally made of plastic, the protrusion 221, which is part of the frame 22 and is also made of plastic, isolates and shields part of the magnetic lines of force. Passing the wires through the protrusion 221 prevents electromagnetic interference to the wires on both the inner and outer sides of the radial direction of the protrusion 221.

[0054] In another embodiment, such as Figure 5 As shown, a slot 34 is formed on the inner wall of the outer shell, located within the annular anti-rotation space, and the slot 34 is engaged with the protrusion 221.

[0055] When the variable frequency motor starts working, whenever the protrusion tends to move radially outward, the slot wraps around the protrusion, providing a counterforce and firmly holding it in place. This restricts the protrusion's radial outward displacement, ensuring stable installation between the housing 3 and the frame 22. This, in turn, allows the stator assembly held by the frame 22 to be stably positioned, preventing radial disturbance of the rotor assembly that interacts with the stator assembly. In other words, the rotor shaft is also unlikely to experience radial disturbance, ensuring coaxiality and reducing noise while improving safety. Furthermore, the protrusion and slot interlocking mechanism facilitates easy assembly and disassembly between the housing 3 and the frame 22, thus simplifying the assembly and disassembly of the stator 21 without damaging components.

[0056] Furthermore, a groove is formed between the inner end of the end plate and the inner side of the side plate. That is, the groove 34 is formed by both the end plate and the side plate, and the groove is engaged with the protrusion. It can be understood that the inner side of the side plate can form part of the side of the groove, and the inner end of the end plate forms the top of the groove, which improves the structural strength of the groove. When the variable frequency motor starts working, if the protrusion has a tendency to move radially, the inner side of the side plate has a pressing effect on the protrusion, so that the installation between the outer shell 3 and the frame 22 can be more stable, effectively avoiding radial disturbance of the rotor shaft 11.

[0057] Please see Figure 6 This utility model also provides a food processing machine, including the aforementioned variable frequency motor for food processing machines, a main housing 4, and a blade assembly 5. Please refer to the following for details regarding the variable frequency motor. Figures 1-5 .

[0058] The main housing 4 is used to install the variable frequency motor. The blade assembly 5 is disposed outside the main housing 4. The rotor shaft 11 in the rotor assembly 1 passes through the main housing 4 and is connected to the blade assembly 5 in a transmission manner. The protrusion 221 extends in the direction close to the blade assembly 5.

[0059] It should be noted that the food processing machine can be a soymilk maker, juicer, blender, or slow juicer with high-speed crushing and mixing functions. The blade assembly 5 is used to crush and mix materials such as beans, vegetables, and fruits. The variable frequency motor inside the main housing 4 drives the blade assembly 5 to rotate together through the rotor shaft 11.

[0060] Understandably, since the protrusion 221 extends towards the blade assembly 5, it extends into the inner cavity 31 of the outer shell 3 and abuts against the inner wall of the outer shell 3. The inner wall of the outer shell 3 will prevent the protrusion 221 from moving radially outward, thus preventing the skeleton 22 from moving radially outward. This makes it difficult for radial relative displacement to occur between the outer shell 3 and the skeleton 22. The two can cooperate stably, are not prone to obvious resonance, greatly reduce noise, and also ensure coaxiality. This makes the blade assembly 5, which is connected to the rotor shaft 11, cut stably, cut the material more evenly, greatly improve the crushing rate, and improve the taste.

[0061] In addition to the preferred embodiments described above, the technical solutions protected by this utility model are not limited to the above embodiments. It should be noted that the combination of multiple technical solutions in any one embodiment, as well as the combination of technical solutions in any one embodiment with technical solutions in one or more other embodiments, are 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 variable frequency motor for a food processor, characterised in that, The utility model relates to a food processor variable frequency motor, which comprises a rotor assembly and a stator assembly. The rotor assembly comprises a rotor shaft. The stator assembly is arranged on the outer periphery of the rotor assembly and comprises a stator and a skeleton clamped outside the stator. The outer shell body has an inner cavity for accommodating the stator assembly and the rotor assembly.

2. The variable frequency motor for food processors according to claim 1, characterized in that, The outer shell body has an inner wall with a clamping groove located in the annular rotation-stopping space.

3. The variable frequency motor for food processors according to claim 2, characterized in that, The inner end of the end plate and the inner side of the side plate are both smooth surfaces.

4. The variable frequency motor for food processors of claim 1, wherein, The side plate has a surrounding edge between the heat dissipation hole and the end plate.

5. The variable frequency motor for food processors of claim 1, wherein, The protrusion comprises a body and a clamping portion arranged on the side away from the stator.

6. The variable frequency motor for food processors of claim 1, wherein, The stator comprises a tooth portion wound with a winding and a yoke portion arranged on the outer side of the tooth portion.

7. The variable frequency motor for food processors of claim 1, wherein, The skeleton is sleeved outside the tooth portion and the yoke portion.

8. The variable frequency motor for food processors of claim 1, wherein, The protrusion is arranged on the radial outer side corresponding to the tooth portion and above the yoke portion.

9. The variable frequency motor for food processors of claim 1, wherein, The protrusion has a wire passing hole formed through its thickness direction.

10. A food processor characterised in that, The food processor variable frequency motor comprises the food processor variable frequency motor, a main machine shell body for accommodating the variable frequency motor, and a knife assembly arranged outside the main machine shell body. The rotor shaft of the rotor assembly passes through the main machine shell body and is drivingly connected with the knife assembly. The protrusion extends towards the knife assembly.

Images