Driving device of food processor

Abstract

The utility model provides a driving device of a food processor, which comprises a stator iron core and a coil winding, the stator iron core and the coil winding are respectively and axially distributed with a crushing device of the food processor, and the crushing device comprises a crushing cutter and a transmission magnetic disk. The driving device drives the transmission magnetic disk to rotate by generating a changing magnetic field so as to drive the crushing cutter to rotate; the stator core comprises a stator body and a stator tooth pole, the coil winding is wound on the stator tooth pole, a first end of the stator tooth pole is connected to the stator body, and a second end of the stator tooth pole is provided with a tooth pole end face; the area of the end face of the tooth pole is larger than the area of the cross section of the stator tooth pole, and when the driving device is powered off, the end face of the tooth pole is attracted to the smashing device through the transmission magnetic disk, so that it is guaranteed that the smashing device cannot fall off or fly-cut from the interior of the cavity in the powered-off state, and use safety of a user is fully guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of food processor, especially relate to a kind of food processor's driving device, and the dismounting of comminuting knife relative to cup body can be driven by the comminuting knife work of varying magnetic field. BACKGROUND

[0002] The existing food processor, such as breaking wall machine, soybean milk machine and the like, generally includes a main machine, a cup body detachably connected with the main machine, a comminuting knife arranged in the cup body, a motor arranged in the main machine, a comminuting knife including a comminuting blade and a knife shaft, the knife shaft is provided with a first connecting head, the motor shaft is provided with a second connecting head, the first connecting head and the second connecting head are engaged and connected to transmit the motor power to the comminuting knife, the comminuting blade rotates and comminutes and processes the food in the cup body. Since the connecting heads are in contact and engaged transmission, the noise and vibration noise of the motor as a power source are directly transmitted upward to the cup body, which is superimposed with the comminuting noise in the cup body. With the increase of the dismounting times of the cup body and the main machine, the installation positioning and wear between the connecting heads are aggravated, which causes the coaxiality of the connecting heads relative to the motor shaft and the knife shaft to decrease, and further generates transmission abnormal sound, and the comminuting performance of the food processor is also affected due to the decrease of the coaxiality and the disturbance of the comminuting knife.

[0003] Another existing food processor is provided with a motor on the detachable cup body to avoid the wear between the connecting heads, the motor shaft is directly connected with the comminuting knife shaft to drive the comminuting knife to rotate, which avoids the transmission noise between the connecting heads, but the motor is detachably arranged with the cup body, which is not conducive to the lightweight of the cup body, the user is not easy to take and place the cup body, and the user operation experience is reduced. In addition, whether there is a connecting head or not, the comminuting knife is fixedly arranged at the bottom end of the cup body, and the user is difficult to clean the comminuting blade and the space below the blade, which causes inconvenience in cleaning.

[0004] In order to solve the problem of cleaning the comminuting knife, the industry has appeared a food processor with a detachable comminuting knife assembly, which realizes the thorough cleaning of the comminuting knife by the user dismounting the comminuting knife assembly. At the same time, the problems of dismounting inconvenience and the decrease of installation alignment and sealing reliability caused by frequent dismounting of the comminuting knife assembly are still difficult to solve. In addition, whether the comminuting knife needs to be dismounted and cleaned or not, there is a risk of sealing aging and liquid leakage damage to the motor at the connection between the comminuting knife shaft and the cup body.

[0005] Utility model patent CN201110155563.4 discloses an indirect transmission food processing machine, including a container, a crushing blade disposed within the container, a motor, a base for the built-in motor, and a driving coupling disposed on the motor's power output shaft and a driven coupling connected to the crushing blade. The driving and driven couplings use non-contact transmission, effectively solving the wear problem between them. Furthermore, the container eliminates the need for a blade shaft hole and sealing, completely solving the leakage problem. The blades are also detachable, facilitating container cleaning. However, both the driving and driven couplings use metal transmission discs. The driving coupling is connected to the motor, resulting in dual noise from both the motor and the driving coupling. The driven coupling is exposed within the container, thus generating significant noise from its relative movement with the material inside.

[0006] Utility model patent CN202211320481.5 discloses a food processor, including a blending cup assembly and a main unit assembly. The blending cup and blending assembly include a rotating component, which comprises a driven magnet and a stirring element. The driven magnet is a permanent magnet. The main unit assembly includes an electromagnetic drive device. When energized, the electromagnetic drive device generates a changing magnetic field. This magnetic field attracts the driven magnet, causing the rotating component to be attracted to the bottom of the blending cup. When de-energized, the magnetic force between the electromagnetic drive device and the driven magnet disappears, allowing the blending component to be separated from the blending cup. This makes the blending cup assembly easy to remove after the magnetic field disappears. In other words, when the changing magnetic field generated by the electromagnetic drive device disappears, the permanent magnet in the blending component is not attracted by the main unit assembly, thus allowing the blending component to be easily removed from the blending cup. However, food processing machines operate at high speeds. The mixing components, including metal pulverizing blades, typically reach speeds exceeding 10,000 rpm. In the event of a power outage, the changing magnetic field disappears, and the mixing components are no longer subject to any adsorption force. Furthermore, the pulverizing blades continue to rotate at high speed due to inertia. In this situation, the pulverizing blades are not under external control, making them highly susceptible to the risk of flying blades and slurry splashing. Especially when there is localized material jamming between the mixing components and the bottom of the container, or when the bottom of the mixing components is partially supported by granular material, the uneven circumferential and axial forces on the blades during high-speed mixing can easily cause the blades to tilt, further increasing the risk of flying blades and producing abnormal grinding noise. Additionally, in this design, the magnetic field generated by the energized stator structure of the electromagnetic drive device provides very limited torque, insufficient to drive the pulverizing blades for fine grinding of solid-liquid mixtures at high speeds. Utility model patent CN201910786730.1 discloses a rotor core. The stator core consists of multiple layers of laminations stacked radially outwards and rolled from the inside out. This rotor core is used in a motor where the stator and rotor assemblies are integrated into a single structure. This integrated motor serves as the power unit of a food processor, driving the pulverizing blades to rotate via the motor shaft. While this design still presents issues like water leakage at the connection between the cup and the drive shaft, and noise from contact-type power transmission, it also avoids the technical problems of integrated linkage between the rotor assembly and the pulverizing blades because both the stator and rotor assemblies are housed within the motor housing. Utility Model Content

[0007] The purpose of this invention is to solve the safety problem of food processing machines in the event of a power outage, where the pulverizing blade continues to rotate at high speed due to inertia, causing the blade to fly off and the pulverizing balance to be lost, resulting in slurry splashing, in scenarios where a changing magnetic field is generated by a driving device to drive the pulverizing blade to rotate.

[0008] To solve the above-mentioned technical problems, this utility model provides a drive device for a food processing machine, including a stator core and a coil winding. The stator core and the coil winding are axially distributed with the crushing device of the food processing machine. The crushing device includes a crushing blade and a transmission disk. The drive device drives the transmission disk to rotate by generating a changing magnetic field, thereby driving the crushing blade to rotate. The stator core includes a stator body and stator teeth. The coil winding is wound on the stator teeth. The first end of the stator teeth is connected to the stator body, and the second end of the stator teeth is provided with a tooth end face. The area of ​​the tooth end face is larger than the cross-sectional area of ​​the stator teeth. When the drive device is de-energized, the tooth end face is attracted to the crushing device through the transmission disk.

[0009] Furthermore, the stator body includes a yoke bridge that circumferentially connects the first ends of the plurality of stator tooth poles into a single unit.

[0010] Furthermore, the second end of the stator tooth extends outward in a direction away from the first end and its cross-sectional area gradually increases.

[0011] Furthermore, the second end of the stator tooth pole extends toward the adjacent two side tooth poles to form a pole shoe, and the transmission disk is located directly above the pole shoe.

[0012] Furthermore, the second end of the stator tooth extends radially outward to form a stepped portion.

[0013] Furthermore, the ratio of the total projected area of ​​the stator tooth poles in the horizontal plane to the total projected area of ​​the yoke bridge in the horizontal plane is the tooth pole arc coefficient η, where 0.5 ≤ η ≤ 0.95.

[0014] Furthermore, the stator core includes an insulating layer that covers the outer surfaces of the stator body and a plurality of stator teeth, and the coil winding is wound around the outer surface of the insulating layer of the stator teeth.

[0015] Furthermore, the tooth end face and / or the bottom surface of the stator body are exposed outside the insulating layer.

[0016] Furthermore, the stator core includes a first insulating layer and a second insulating layer. The first insulating layer covers the outer surface of the stator body and the stator teeth, and the second insulating layer covers the outer surface of the coil winding and the stator core.

[0017] Furthermore, the outer diameter of the stator core is 30mm to 100mm, and the thickness of the stator core is 15mm to 60mm.

[0018] Furthermore, the stator core is made of silicon steel sheets, which are stacked radially.

[0019] The beneficial effects of this utility model are:

[0020] 1. When the food processor is powered on, the coil winding is energized, and current flows through the winding path, thereby generating a magnetic field in a direction perpendicular to the winding path. The magnetic field generated by the stator core is variable and acts on the transmission disk. Driven by the variable magnetic field, the transmission disk rotates and drives the pulverizing blade to rotate synchronously. The tooth end faces of the stator core are arranged vertically and vertically corresponding to those of the transmission disk, and the area of ​​the tooth end face is larger than the cross-sectional area of ​​the stator teeth. When the drive device is de-energized, no current flows through the coil winding, and the variable magnetic field disappears. However, the pulverizing blade in high-speed pulverizing state still maintains a high rotation speed due to inertia. The tooth end faces are attracted to the pulverizing device through the transmission disk, ensuring that the pulverizing device can still be reliably attracted by the tooth end faces even when not under the influence of the variable magnetic field. The pulverizing device cannot be removed from the cavity of the food processor, thus ensuring that the pulverizing device will not fall out of the cavity or fly away when the power is off, fully guaranteeing user safety.

[0021] Especially when there is particulate material between the crushing device and the inner wall of the cavity during a power outage, the crushing device will be lifted on one side, causing a large radial tilt of the rotation axis of the crushing blade, deviating from the central axis of the cavity. When the tip of the crushing blade contacts the solid-liquid mixture, the particulate solid material is rebounded after contact with the blade and bounces back against the inner wall of the cavity. This results in extremely uneven force on the crushing blade in the solid-liquid mixture, increasing the risk of the crushing blade being thrown out. At this time, the turbulent slurry is very prone to splashing. Especially when the power is just turned off, the crushing blade rotates at a very high speed. Even though the drive disk and the tooth tip are isolated by the walls of the blade holder housing and the cup, the stator teeth can still effectively "hold" the crushing device in the unbalanced processing environment by adsorbing the drive disk to prevent the blade from flying out, allowing the slurry to continue moving within the cavity.

[0022] 2. The stator body includes a yoke bridge, which circumferentially connects the first ends of multiple stator teeth into one unit. The yoke bridge connects the magnetic circuits between each stator tooth. When the drive device is powered on, the yoke bridge can fully concentrate the magnetic field lines generated by the coil winding, so that the magnetic field lines are focused and strengthened by the yoke bridge and stator teeth of the stator core, which can generate greater torque on the transmission disk, thereby driving the pulverizer to pulverize food at high speed, resulting in a smooth and residue-free slurry.

[0023] 3. The second end of the stator tooth extends outward in a direction away from the first end, and its cross-sectional area gradually increases. The cross-sectional area refers to the section perpendicular to the rotation center of the crushing device. The outward extension direction can be any circumferential direction of a single stator tooth, thus ensuring sufficient extension area of ​​the tooth end face within the limited space of the stator core. This allows the stator tooth to reliably adhere to the drive disk in the event of a power outage, thereby axially holding the crushing device within the cavity and preventing flying blades or slurry splashing. Preferably, the second end of the stator tooth extends towards adjacent teeth on both sides. This design improves the adhesion between the stator core and the drive disk without changing the circumferential outer diameter and axial height of the stator core, ensuring user safety. Furthermore, the drive device has no moving structure, the entire main unit has no resonance, and the volume and weight of the stator core are further reduced, facilitating space optimization and overall lightweight design.

[0024] 4. The second end of each stator tooth extends towards the adjacent two sides to form a pole shoe. The transmission disk is located directly above the pole shoe. The pole shoe and the transmission disk are axially matched to avoid magnetic leakage. Moreover, the pole shoe can further improve the strength and stability of the changing magnetic field of the drive device when it is powered on, further optimize the torque transmission of the crushing blade, and avoid problems such as blade jamming and insufficient crushing when processing hard materials, as well as processing noise and unstable dynamic balance of the crushing blade due to the detachable drive device shifting laterally or longitudinally. When the drive device is powered off, the pole shoes formed by extending towards the adjacent two sides can ensure that the crushing blade is firmly attracted to the pole shoe through the transmission disk, and the crushing blade will not fly away under normal or abnormal power failure conditions.

[0025] 5. The second end of the stator tooth extends radially outward to form a stepped portion. The end face of the stepped portion is equivalent to the extreme end face of the tooth, further increasing the area of ​​the extreme end face of the tooth, which is more conducive to adsorbing the transmission disk. When the power is off, the changing magnetic field driving the pulverizing blade to rotate disappears, maintaining the motion stability of the pulverizing blade that continues to rotate at high speed in the slurry in the cavity due to inertia. The tooth arc coefficient of the food processor is η, 0.5≤η≤0.95. This setting can ensure that the outer diameter of the stator core is small and has a flat structure. The height of the stator core is less than the outer diameter to form a flat structure. The transmission disk can be rotated at high speed and can meet a large load. The food processor can process a variety of food ingredients, a wider range of hardness, and can realize a multi-functional platform for slurry processing, dry grinding, meat grinding, and dough processing.

[0026] 6. The coil winding is wound around the outer surface of the insulation layer of the stator teeth, eliminating the need for a separate winding bracket. This simplifies the entire power drive device structurally, reduces its size, and allows for a further reduction in the stator core diameter. It also simplifies installation and optimizes assembly efficiency. Preferably, the tooth end faces and / or the bottom surface of the stator body are exposed on the insulation layer, further reducing the overall height of the core and allowing for a flatter design to meet the storage needs of small kitchen spaces. Alternatively, a first and second insulation layer can be provided to further enhance the electrical safety of the drive device.

[0027] 7. The outer diameter of the stator iron (30mm-100mm) and the thickness of the stator iron core (15mm-60mm) can ensure that the drive device with no moving parts is miniaturized and easy to install. Moreover, there is no need to consider the dynamic balance and flexible shock absorption structure of the drive device, which greatly simplifies the design and installation cost of the food processing machine and is more conducive to the expansion and extension of the product functions and cup body component structure of the new power platform of the variable frequency drive of the food processing machine. Attached Figure Description

[0028] 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.

[0029] Figure 1 This is a schematic diagram of the overall structure of the food processing machine described in this utility model.

[0030] Figure 2 This is a schematic diagram of the combined structure of the crushing device and the driving device of the food processing machine described in this utility model.

[0031] Figure 3 This is a schematic diagram of the drive device for the food processing machine described in this utility model.

[0032] Figure 4 This is a schematic diagram of the stator core structure of the food processing machine described in this utility model.

[0033] Figure 5 This is a schematic diagram of the stator core yoke bridge of the food processing machine described in this utility model.

[0034] Figure 6 This is a schematic diagram of the transmission disk structure of the food processing machine described in this utility model.

[0035] Figure 7 A schematic diagram of the stator core structure of the food processing machine described in this utility model, which has an insulating layer.

[0036] Figure 8 This is a schematic diagram of another stator core structure of the food processing machine described in this utility model.

[0037] Figure 9 This is a schematic diagram of another drive device for the food processing machine described in this utility model.

[0038] Figure 10 This is a schematic projection of the permanent magnet of the transmission disk of the food processing machine described in this utility model.

[0039] Figure 11 This is a projected schematic diagram of the transmission disk structure of the food processing machine described in this utility model.

[0040] Figure 12 This is a schematic diagram of the changing magnetic field lines generated by the drive device of the food processing machine described in this utility model.

[0041] The components shown in the diagram are named as follows: 100, Drive unit; 101, Stator core; 102, Coil winding; 103, Stator body; 104, Tooth end face; 105, Yoke bridge; 106, Pole shoe; 107, Stepped section; 108, Insulation layer; 109, First insulation layer; 110, Second insulation layer; 111, Hole; 200, Crushing device; 201, Crushing blade; 202, Blade holder housing; 203, Drive disk; 204, Disk body; 205, Permanent magnet; 300, Cup assembly; 301, Cup; 302, Cavity; 400, Heating device; 401, Heating element; 500, Main unit. Detailed Implementation

[0042] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0043] like Figures 1 to 12 As shown, this utility model provides a drive device 100 for a food processing machine, including a stator core 101 and a coil winding 102. The stator core and the coil winding are axially distributed with respect to the crushing device 200 of the food processing machine. The crushing device includes a crushing blade 201 and a transmission disk 203. The drive device drives the transmission disk 203 to rotate by generating a changing magnetic field, thereby driving the crushing blade to rotate. The stator core includes a stator body 103 and stator teeth. The coil winding is wound on the stator teeth. The first end of the stator teeth is connected to the stator body, and the second end of the stator teeth is provided with a tooth end face 104. The area of ​​the tooth end face is larger than the cross-sectional area of ​​the stator teeth. When the drive device is powered off, the tooth end face is attracted to the crushing device through the transmission disk, thereby avoiding the crushing blade flying off and the slurry splashing when the power is off.

[0044] Specifically, such as Figure 1 and Figure 2 As shown, the food processor includes a cup assembly 300, a heating device 400, a crushing device 200, and a driving device 100. The cup assembly 300 includes a cup body 301 with a cavity 302 for holding food. The crushing device 200 includes a crushing blade 201, a blade holder housing 202, and a transmission disk 203 disposed within the blade holder housing 202. The transmission disk 203 is drively connected to the crushing blade 201. The crushing device 200 is detachably disposed within the cavity. The heating device 400 includes a heating element 401 for heating the food within the cavity. The driving device 100 includes a stator core 101 and a coil winding 102. The stator core 101 and the coil winding 102 are axially distributed along the rotation axis of the crushing blade 201 with respect to the crushing device 200. The transmission disk 203 is driven to rotate by a changing magnetic field, thereby driving the pulverizing blade 201 to rotate. The stator core 101 includes a stator body 103 and stator teeth. A winding groove is provided between adjacent stator teeth. The coil winding 102 is wound on the stator teeth. The first end of the stator teeth is connected to the stator body 103, and the second end of the stator teeth is provided with a tooth end face 104. The area of ​​the tooth end face 104 is larger than the cross-sectional area of ​​the stator teeth. When the drive device 100 is de-energized, the tooth end face 104 is attracted to the pulverizing device 200 through the transmission disk 203, so that the pulverizing device 200 cannot be removed from the cavity. The user cannot remove the pulverizing device 200 from the cavity with conventional force, but instead the entire food processing machine will be lifted.

[0045] Currently, the industry has disclosed a technical solution, such as the invention patent with patent number CN202211320481.5, which discloses a food processor including a blending cup assembly and a main unit assembly. The blending cup and the blending assembly include a rotating component, which includes a driven magnet and a stirring element. The driven magnet is a permanent magnet. The main unit assembly includes an electromagnetic drive device. When energized, the electromagnetic drive device generates a changing magnetic field. The magnetic field attracts the driven magnet, causing the rotating component to be attracted to the bottom of the blending cup. When de-energized, the magnetic force between the electromagnetic drive device and the driven magnet disappears, and the blending component can be separated from the blending cup. This allows the blending cup assembly to be easily removed after the magnetic field disappears. In other words, when the changing magnetic field generated by the electromagnetic drive device disappears, the permanent magnet in the blending component is not attracted by the main unit assembly, thus allowing the blending component to be easily removed from the blending cup. However, food processing machines operate at high speeds. The mixing components, including metal pulverizing blades, typically reach speeds exceeding 10,000 rpm. In the event of a power outage, the changing magnetic field disappears, and the mixing components are no longer subject to any attraction. Furthermore, the pulverizing blades continue to rotate at high speed due to inertia. In this situation, the blades are not under external control, making them highly susceptible to the risk of flying blades and slurry splashing. Especially when there is localized material jamming between the mixing components and the bottom of the container, or when the bottom of the mixing components is partially supported by granular material, the uneven circumferential and axial forces on the blades during high-speed mixing can easily cause the blades to tilt, further increasing the risk of flying blades and producing abnormal grinding noise. A readily conceivable solution in existing technology is to install independent magnets on both the pulverizing device and the main unit to hold the pulverizing device in place and prevent it from falling off. For example, patent CN201910004484.X discloses a juicer using a split brushless motor. The first and second fixed magnets attract each other magnetically to better secure the juicer lid to the base, preventing the juicer from tipping over during operation. As is common knowledge in the industry, juicers require far less torque than food processors like blenders for processing beans. Their lower speed range and cold processing eliminate the safety risks of blades moving at high speed towards the lid and opening it, or hot liquid splashing from the vent. These are user safety hazards, not simply machine malfunctions. While the patent describes using additional fixed magnets to ensure basic operational stability and prevent tipping, and also allows for a more efficient space layout, for food processors with heat processing capabilities, adding extra magnets not only increases costs but also significantly impacts the magnetic field between the drive disk and the stator core, directly leading to magnetic instability and reduced drive performance. In addition, with limited installation space, it is difficult to ensure that the heating device, adsorption device and driving device do not interfere with each other.Of course, this patent further confirms that when using a coil to generate a magnetic field to drive the rotation of the crushing device, it is difficult to achieve a safe connection between the crushing blade and the main unit without adding additional structural components. Clearly, those skilled in the art, inspired by the aforementioned prior art patents, would readily agree that in scenarios where a coil generates a magnetic field to drive the crushing device, the magnetic field disappears after power is cut off, and the crushing device will no longer be subject to axial external forces from the driving device other than gravity. Furthermore, in the aforementioned two prior art patent solutions, the torque provided by the magnetic field generated by the energized stator structure of the electromagnetic drive device is very limited, insufficient to drive the crushing blade in the fine crushing of high-speed solid-liquid mixtures.

[0046] This solution aims to creatively identify and address the technical problems of magnetic drive devices, overcome the industry's technical prejudice that magnetic drive devices cannot adsorb pulverizing devices when power is off, and develop a technical solution that can still firmly adsorb pulverizing devices even when the magnetic drive device is powered off. From identifying the motivation for the technical problem, to pinpointing the problem, and then to finding a solution, this involves overcoming a technical prejudice that is difficult for those skilled in the art to overcome and is also difficult to conceive of. The outstanding substantive features and significant progress of this technical solution lie precisely in this. Specifically, this implementation is preferred, such as... Figure 1 and Figure 2 As shown, the food processing machine includes a main unit 500, and the cup assembly 300 is detachably installed on the main unit. The cup assembly 300 includes a cup body and a cup base. Preferably, the heating element is disposed on the bottom wall of the cup body and at the junction of the bottom wall and the side wall to heat the material in the cavity. The crushing device 200 is detachably installed on the bottom wall of the cavity. Preferably, the driving device 100 is disposed in the main unit and is disposed below the cup base, that is, below the crushing device 200. For a food processor in which the cup assembly 300 is detachable from the main unit, the crushing device 200 cannot be removed from the cavity. This means that, without an additional cup ejection mechanism or demagnetizing mechanism, when the hand holding the cup assembly 300 lifts the cup upwards, the cup assembly 300 is attracted and does not separate by the attraction force between the transmission disk 203 and the tooth end face 104. If the lifting force is large enough, the cup assembly 300 and the main unit will be lifted together. Similarly, the same applies when the hand holding the crushing device 200 is lifted upwards.

[0047] like Figure 3 As shown, the coil winding 102 includes a three-phase symmetrical winding (ABC). Vector control of the three-wire coil winding 102 is achieved through a control chip circuit, thereby generating a stator rotating magnetic field. This stator rotating magnetic field attracts the transmission disk 203 to rotate, thus driving the crushing blade 201 to rotate and process the material within the cavity. Figure 12As shown, when the food processing machine is energized, the coil winding 102 is energized, and current flows through the winding path, defined as the plane direction formed by the x and y axes. A magnetic field is then generated in the z-axis direction, perpendicular to the winding path. The magnetic field generated by the stator core 101 is variable and acts on the transmission disk 203 within the tool holder housing 202. The ABC phases of the coil winding are energized, generating a changing rotating magnetic field. The direction of the magnetic field lines in one state of energized coil winding is as follows: Figure 12 As shown, the black area represents the schematic diagram of one of the magnetic field lines. The magnetic field line passes upward through the N pole of the permanent magnet and downward through the S pole of the permanent magnet, forming a closed-loop magnetic circuit along the adjacent stator teeth. Driven by the changing magnetic field, the transmission disk 203 rotates and drives the pulverizing blade 201 to rotate synchronously, thereby providing a large torque to the pulverizing device and ensuring the stability of pulverizing efficiency and sound quality during processing. The tooth end faces 104 of the stator core 101 are vertically aligned with the transmission disk 203, as shown... Figure 4 and Figure 5 As shown, the area of ​​the tooth end face 104 is larger than the cross-sectional area of ​​the stator tooth pole. When the drive device 100 is de-energized, no current flows through the coil winding 102, and the changing magnetic field disappears. However, the pulverizing blade 201 in high-speed pulverizing state still maintains a high rotation speed due to inertia. The tooth end face 104 is attracted to the pulverizing device 200 through the transmission disk 203, which fully ensures that the pulverizing device 200 can still be reliably attracted by the tooth end face 104 when it is not affected by the changing magnetic field. The pulverizing device 200 cannot be removed from the cavity, thus ensuring that the pulverizing device 200 will not fall out of the cavity or fly away when the power is off, fully ensuring the user's safety.

[0048] Especially when there is particulate material between the crushing device and the inner wall of the cavity during a power outage, the crushing device 200 will be lifted on one side, causing a large radial tilt of the rotation axis of the crushing blade 201, deviating from the central axis of the cavity. When the tip of the crushing blade 201 comes into contact with the solid-liquid mixture, the particulate solid material is rebounded after contacting the blade and bounces back against the inner wall of the cavity. This results in an extremely uneven force on the crushing blade 201 in the solid-liquid mixture, increasing the risk of the crushing blade 201 being thrown out. At this time, the turbulent slurry is very prone to splashing. Especially when the power is just turned off, the crushing blade 201 rotates at an extremely high speed. Even though the drive disk 203 and the tooth end face 104 are still isolated by the blade holder housing 202 and the wall of the cup, the stator teeth can still effectively "hold" the crushing device 200 by adsorbing the drive disk 203 in the unbalanced processing environment to prevent the blade from flying out, so that the slurry can still keep moving in the cavity. Preferably, the distance between the stator core 101 and the permanent magnet 205 on the transmission disk 203 is set to 2-12 mm, and more preferably, the distance between the stator core 101 and the permanent magnet 205 on the transmission disk 203 is set to 2.5 mm-8 mm. Even if the transmission disk 203 and the tooth end face 104 of the stator core 101 are isolated by the blade holder housing 202 and the bottom wall of the cup, it can still be guaranteed that the transmission torque of the drive device 100 reaches more than 0.8 N·m when the power is off, and the attraction between the tooth end face 104 and the transmission disk 203 is greater than 30 N. On the one hand, the crushing effect of the crushing blade 201 is good when the power is on, and the slurry is processed more finely. On the other hand, the crushing blade 201 will not fly away or the slurry will splash when the power is off.

[0049] like Figure 5 As shown, the stator body 103 includes a yoke bridge 105, which circumferentially connects the first ends of multiple stator teeth into a single unit. Preferably, in this embodiment, the yoke bridge 105 is an annular structure with a certain thickness and a central hole 111 for clearance. The yoke bridge 105 connects the magnetic circuits between each stator tooth. When the drive device 100 is energized, the yoke bridge 105 can fully concentrate the magnetic field lines generated by the coil winding 102, allowing the magnetic field lines to be focused and strengthened by the yoke bridge 105 and the stator teeth of the stator core 101. This generates greater torque on the transmission disk 203, driving the pulverizer 201 to pulverize food at high speed, resulting in a smooth, fine, and residue-free slurry. The number of stator teeth is a multiple of 3; in this embodiment, 6 stator teeth are preferably provided.

[0050] The second end of the stator tooth extends outward in a direction away from the first end, and its cross-sectional area gradually increases. This cross-sectional area refers to the section perpendicular to the rotation center of the crushing device 200. The outward extension can be in any circumferential direction of a single stator tooth, thus ensuring sufficient extension area of ​​the tooth end face 104 within the limited space of the stator core 101. This allows the stator tooth to reliably adhere to the transmission disk 203 even when power is off, thereby axially holding the crushing device 200 within the cavity and preventing knife flying or slurry splashing. Preferably, the second end of the stator tooth extends towards adjacent teeth on both sides. This arrangement improves the adhesion between the stator core 101 and the transmission disk 203 without changing the circumferential outer diameter and axial height of the stator core 101, ensuring user safety. In addition, the drive unit 100 has no moving parts and is entirely a stationary component. The entire main unit does not have any resonance caused by the drive unit 100, which greatly reduces the noise of the food processing machine. Furthermore, the size and weight of the stator core 101 are further reduced, which is more conducive to optimizing the main unit space and making the whole machine lighter.

[0051] As a preferred option, such as Figure 4 and Figure 5 As shown, the second end of the stator tooth poles extends towards the adjacent tooth poles to form pole shoes 106. The transmission disk 203 is located directly above the pole shoes 106. The pole shoes 106 and the transmission disk 203 are axially matched to avoid magnetic leakage. Moreover, the pole shoes 106 can further improve the strength and stability of the changing magnetic field of the drive device 100 when it is powered on, further optimize the torque transmission of the crushing blade 201, and avoid problems such as blade jamming and insufficient crushing when processing hard materials, as well as processing noise and unstable dynamic balance of the crushing blade 201 caused by the detachable drive device 100 shifting laterally or longitudinally. When the drive device 100 is powered off, the pole shoes 106 formed by extending towards the adjacent tooth poles can ensure that the crushing blade 201 is firmly attracted to the pole shoes 106 through the transmission disk 203 to the maximum extent, and the crushing blade 201 will not have the risk of flying off under normal or abnormal power failure. Moreover, without the aid of an additional separation structure or demagnetizing mechanism, the cup assembly 300 cannot be detached from the main unit. When the user holds the handle of the cup assembly 300 to lift the cup, the entire food processing machine can be lifted by the adsorption force between the transmission disk 203 and the tooth end face 104.

[0052] The ratio of the total projected area of ​​the stator teeth on the horizontal plane to the total projected area of ​​the yoke bridge 105 on the horizontal plane is the tooth arc coefficient η, where 0.5≤η≤0.95. In this embodiment, η is 0.75. This setting ensures that the outer diameter of the stator core 101 is small and has a flat structure. The height of the stator core 101 is smaller than the outer diameter to form a flat structure. The transmission disk 203 can be rotated at high speed and can meet a large load. The food processing machine can process a variety of food ingredients with a wider range of hardness and can realize a multi-functional platform for processing slurry, dry grinding, meat grinding and dough processing.

[0053] like Figure 6 As shown, the transmission disk 203 includes a disk body 204 and a permanent magnet 205 fixedly disposed on the disk body 204. The N pole and S pole of the permanent magnet 205 are alternately distributed circumferentially. Specifically, the N pole and S pole of the permanent magnet 205 are spaced apart circumferentially. The permanent magnet 205 is preferably made of neodymium iron boron material, and the thickness of the permanent magnet 205 is preferably 2mm to 6mm. In this embodiment, the thickness of the permanent magnet 205 is 4.1mm, which allows the transmission disk 203 to have strong magnetism and sufficient torque, while also being able to reliably attract and cooperate with the tooth end face 104. The transmission disk 203 is equivalent to a rotor that is axially cooperated with the stator core 101. The permanent magnet 205 is fixed to the disk body 204 by mechanical installation, making the transmission disk 203 more flat. Of course, the permanent magnet 205 can also be configured as an integral ring-shaped permanent magnet 205. Specifically, the permanent magnet 205 can also be an integrally magnetized ring-shaped permanent magnet 205, with the N pole and S pole of the ring-shaped permanent magnet 205 circumferentially alternating. The three-phase coil winding 102 on the stator teeth generates a changing magnetic field when energized, driving the transmission disk 203 to rotate and causing the crushing blade 201 to rotate synchronously. The high-efficiency, high-torque drive of the crushing blade 201 meets the processing needs of various types of food, and the crushing efficiency of the crushing blade 201 is optimized through stable power drive. Figure 10 and Figure 11 As shown, the number of permanent magnets 205 is even, preferably eight. The ratio of the total projected area of ​​the permanent magnets 205 in the horizontal plane to the total projected area of ​​the transmission disk 203 is the magnetic pole arc coefficient. In this embodiment, the magnetic pole arc coefficient is in the range of 0.5 to 1, which further optimizes the attraction force between the transmission disk 203 and the tooth end face 104 when power is off, as well as the torque transmission when power is on. When the magnetic pole arc coefficient is 1, the permanent magnet 205 completes one full circle.

[0054] This embodiment further optimizes the driving device 100, specifically, as follows: Figure 7As shown, the stator core 101 includes an insulating layer 108, which covers the outer surfaces of the stator body 103 and multiple stator teeth. The coil winding 102 is wound around the outer surface of the insulating layer of the stator teeth. The coil winding 102 is wound around the outer surface of the insulating layer of the stator teeth, eliminating the need for a separate winding bracket or additional support base. This simplifies the structure of the entire power drive device 100, reduces its volume, further shrinks the diameter of the stator core 101, simplifies installation, and optimizes assembly efficiency. Preferably, the tooth end face 104 and / or the bottom surface of the stator body 103 are exposed to the insulating layer. In this embodiment, both the tooth end face 104 and the bottom surface of the stator body 103 are exposed to the insulating layer, further reducing the overall height of the core and allowing for a more flat design to meet the storage needs of small kitchen spaces. It is understandable that... Figure 9 As shown, other types of insulation layers can also be provided. The stator core 101 includes a first insulation layer 109 and a second insulation layer 110. The first insulation layer covers the outer surface of the stator body 103 and the stator teeth, with the tooth end face exposed outside the first insulation layer. The second insulation layer covers the outer surface of the coil winding 102 and the stator core 101, further improving the electrical safety of the drive device 100, while making the drive device 100 waterproof as a whole and allowing it to be exposed.

[0055] The rotation center of the drive disk 203 is coaxially arranged with the axis of the stator core 101, so that the changing magnetic field generated by the drive device 100 can be efficiently and effectively utilized by the drive disk 203. In addition, in the case of power failure, no changing magnetic field acts on the crushing device 200, and the crushing device 200 rotates in the cavity only under the action of gravity. The coaxial arrangement of the rotation center of the drive disk 203 and the axis of the stator core 101 can fully ensure the circumferential uniformity of the adsorption force between the drive disk 203 and the tooth end face 104, avoiding uneven force on the crushing device 200 and slurry splashing caused by slurry turbulence during the initial high-speed operation after power failure.

[0056] The transmission disk 203 includes a permanent magnet 205. The outer diameter of the stator core 101 is 30mm to 100mm, and the thickness of the stator core 101 is 15mm to 60mm, which makes the stator core 101 have a flat structure. This allows the main unit to be extremely thin, fully satisfying the user's convenience in picking up and putting away the device and its retractability. The drive device 100, which has no moving parts, is miniaturized and easy to install. Moreover, there is no need to consider the dynamic balance and flexible shock absorption structure of the drive device 100, which greatly simplifies the design and installation cost of the main unit and is more conducive to the product function and structural expansion of the new power platform for the variable frequency drive of the food processing machine. The stator core 101 is made of silicon steel sheet material, and the silicon steel sheets are stacked radially to further improve the performance of the stator core 101. This allows the coil winding 102 wound on the stator core 101 to carry three-phase current and generate a changing magnetic field through the stator core 101, providing sufficient torque to the permanent magnet 205 in the crushing device 200 to drive the crushing blade 201 to rotate synchronously.

[0057] Understandable, such as Figure 8 As shown, the second end of the stator tooth pole can also be configured as a stepped portion 107. Specifically, the second end of the stator tooth pole extends radially outward to form a stepped portion 107. The end face of the stepped portion 107 is equivalent to the tooth end face 104, which further expands the area of ​​the tooth end face 104, making it more conducive to adsorbing the transmission disk 203. When the power is off, the changing magnetic field that drives the pulverizer 201 to rotate disappears, maintaining the motion stability of the pulverizer 201 that continues to rotate at high speed in the slurry in the cavity due to inertia.

[0058] Understandably, the user experience of the food processing machine can be further optimized by setting a lifting structure for the cup assembly 300. The lifting structure for the cup assembly 300 can also be used as a lifting rod mechanism or an electronically controlled cup lifting mechanism. The trigger part of the lifting rod structure can be set on the grip part of the cup body or on the cup base.

[0059] Understandably, the driving device 100 can be located on the side of the cup body or on the top of the cup body. Correspondingly, the crushing device 200 can also be configured to be installed and cooperate with the side wall of the cup body, with the crushing blade 201 shaft extending laterally, or the crushing device 200 can be installed and cooperate with the top wall of the cup body.

[0060] Understandably, the drive device shown can also be installed in the cup holder below the cup body, so that the drive device is part of the cup body assembly and does not need to be independently installed in the main unit or other independent component space, thus ensuring user safety.

[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 drive arrangement for a food processor, characterised in that, The stator core and the coil winding are respectively distributed axially with the crushing device of the food processor, the crushing device includes a crushing knife and a transmission disk, the driving device drives the transmission disk to rotate by generating a changing magnetic field, so as to drive the crushing knife to rotate; The stator core includes a stator body and a stator tooth pole, the coil winding is wound on the stator tooth pole, the first end of the stator tooth pole is connected to the stator body, and the second end of the stator tooth pole is provided with a tooth pole end face; The area of the tooth pole end face is greater than the cross-sectional area of the stator tooth pole, and when the driving device is powered off, the tooth pole end face is adsorbed with the crushing device through the transmission disk.

2. The drive arrangement of a food processor according to claim 1, characterized in that The stator body includes a yoke bridge, the yoke bridge connects the first ends of a plurality of stator tooth poles circumferentially.

3. The drive arrangement of a food processor according to claim 1, wherein, The second end of the stator tooth pole extends outward in a direction away from the first end and the cross-sectional area gradually increases.

4. The drive arrangement of claim 1, wherein, The second end of the stator tooth pole extends to the direction of the adjacent two stator tooth poles to form a pole shoe, and the transmission disk is located directly above the pole shoe.

5. The drive arrangement of claim 1, wherein, The second end of the stator tooth pole extends radially outward to form a stepped portion.

6. The drive arrangement of a food processor according to claim 2, wherein, The total projection area of the stator tooth pole in the horizontal plane and the total projection area of the yoke bridge in the horizontal plane have a ratio of a tooth pole arc coefficient η, 0.5≤η≤0.

95.

7. The drive arrangement of claim 1, wherein, The stator core includes an insulation layer, the insulation layer covers the outer surfaces of the stator body and a plurality of stator tooth poles, and the coil winding is wound on the outer surface of the insulation layer of the stator tooth pole.

8. The drive arrangement of a food processor according to claim 7, characterized in that The tooth pole end face and / or the bottom surface of the stator body are exposed to the insulation layer.

9. The drive arrangement of claim 1, wherein, The stator core includes a first insulation layer and a second insulation layer, the first insulation layer covers the outer surfaces of the stator body and the stator tooth pole, and the second insulation layer covers the outer surfaces of the coil winding and the stator core.

10. The drive arrangement of claim 1, wherein, The outer diameter of the stator core is 30mm~100mm, and the thickness of the stator core is 15mm~60mm.

11. The drive arrangement of a food processor according to claim 1, characterized in that The stator core is made of silicon steel sheet material, and the silicon steel sheets are arranged in a radial direction.

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