A motor for a food processor and a food processor

Abstract

This invention relates to the field of food processing machines, and discloses a motor for a food processing machine and the food processing machine itself. The motor includes a stator assembly, a rotor assembly, carbon brushes, and a commutator. The stator assembly includes a stator core, and the rotor assembly includes a shaft and a rotor core mounted on the shaft. The motor also includes an insulating bracket fixed to the stator assembly. The carbon brushes are fixed to the commutator at the same radial height via the insulating bracket. The insulating bracket has a suspended carbon brush mounting cavity on the side facing the stator assembly. This application simplifies the installation structure and improves insulation strength by integrating the insulating plate and the motor bracket. By suspending the carbon brush mounting cavity on the insulating bracket, a certain distance is created between the carbon brush mounting cavity and the stator core, effectively avoiding insulation breakdown caused by accumulated carbon powder, ensuring motor safety, and extending motor lifespan.

Description

Technical Field

[0001] This invention relates to the field of food processing machine technology, specifically to a motor for a food processing machine and a food processing machine. Background Technology

[0002] Food processing machines mainly consist of a main unit with a built-in motor and a processing cup assembly with built-in processing blades. The motor drives the processing blades to rotate at high speed to cut and pulverize the food inside the processing chamber. Currently, the motors used in food processing machines are primarily series-wound motors, which mainly include a stator assembly, a rotor assembly, carbon brushes, and a commutator. The carbon brushes are mounted on the stator core of the stator assembly via a motor bracket, while the commutator is correspondingly mounted on the rotor shaft. After assembly, proper insulation treatment must be applied to the commutator and stator core to prevent direct electrical conduction between the commutator and stator core, which could cause a short circuit and thus ensure the motor's lifespan.

[0003] Chinese patent CN112087077A discloses a four-pole series motor technology, and discloses that the carbon brush plate is mounted on the rear bracket of the motor, and the carbon brush plate is isolated from the rear bracket by an insulating sheet. In actual product applications, this prior art has three shortcomings:

[0004] 1. Insulating components are difficult to assemble and fix, which consumes a lot of time;

[0005] 2.4-pole motors produce larger sparks, and the carbon brushes wear out quickly. During motor operation, carbon powder easily accumulates on the insulation sheet, which can break down the insulation sheet, causing insulation failure, withstand voltage breakdown, and motor burnout.

[0006] 3. The limited space of the carbon brush plate restricts the length of the carbon brushes. As the motor continuously wears down the carbon brushes, the limited brush length leads to a short lifespan for the motor, resulting in a shorter product life cycle. This prevents motors using this technology from being widely used.

[0007] In summary, to ensure service life, existing motor structures need to guarantee the reliability of insulation between the commutator and the stator core. Especially during long-term use, the carbon dust scraped off accumulates between the stator core and the commutator due to gravity. As the usage time increases, the accumulation height gradually increases, reducing the distance between the commutator and the stator core and greatly increasing the risk of direct electrical short circuit between the commutator and the stator core. Summary of the Invention

[0008] In order to solve one or more technical problems in the prior art, or at least provide a beneficial alternative, the present invention provides a motor for a food processing machine and a food processing machine that improves the carbon brush insulation capability and reduces the problem of withstand voltage breakdown.

[0009] The present invention discloses a motor for a food processing machine, comprising a stator assembly, a rotor assembly, carbon brushes and a commutator. The stator assembly includes a stator core, the rotor assembly includes a shaft and a rotor core mounted on the shaft, and the motor further includes an insulating bracket fixed to the stator assembly. The carbon brushes are fixed to the commutator at the same radial height via the insulating bracket, and the insulating bracket has a suspended carbon brush mounting cavity on the side facing the stator assembly.

[0010] In existing technologies, to ensure the structural strength of the motor bracket, a metal bracket is typically used. However, metal brackets have poor insulation performance, requiring additional insulation plates and other structures to prevent voltage breakdown. This application simplifies the installation structure by integrating the insulation plate and the motor bracket into an insulated bracket, eliminating the need for an additional insulation plate and improving production efficiency. Furthermore, the insulated bracket increases insulation strength and improves motor reliability, ensuring effective insulation even after prolonged operation and reducing the risk of burnout due to open circuits. The simplified assembly structure results in better motor stability during operation, less deformation, and reduced sparking and vibration. Crucially, this application suspends the carbon brush mounting cavity on the insulated bracket, creating a distance between the carbon brush mounting cavity and the stator core of the stator assembly. This effectively prevents carbon dust from accumulating along the path between the carbon brush mounting cavity and the stator core during long-term use, thus avoiding voltage breakdown between the commutator and stator core and ensuring motor safety and extending motor lifespan. Furthermore, in this application, the carbon brush is fixed at the same radial height as the commutator via an insulating bracket, and the carbon brush is installed in a carbon brush mounting cavity suspended above the stator core. Through this structure, the insulating bracket forms a suspension support for the carbon brush, which allows the carbon brush and the commutator to form a certain distance relative to the stator core. This prevents carbon dust accumulation from causing any one of the carbon brushes or the commutator to short-circuit with the stator core, thereby ensuring the insulation effect.

[0011] As a preferred technical solution for motors used in food processing machines, the insulating bracket includes a bracket body and multiple carbon brush boxes. The carbon brush boxes and the bracket body are an integral structure, and the carbon brush boxes and the bracket body together form a carbon brush mounting cavity.

[0012] The carbon brush box and the bracket body form a single integrated structure, preventing loosening of the fit over long-term operation and thus reducing vibration and noise during operation, resulting in better stability of the entire insulation bracket. Furthermore, the one-piece molding process simplifies assembly procedures and improves production efficiency.

[0013] As a preferred technical solution for motors used in food processing machines, the insulating bracket includes a bracket body and multiple carbon brush boxes. The carbon brush boxes are fixedly connected to the bracket body, and each carbon brush box forms an independent carbon brush mounting cavity.

[0014] The bracket body and carbon brush box are assembled together after being molded separately to form an insulating bracket, which can further improve the insulation performance. Moreover, the carbon brush can be fixed in the carbon brush box first, and then the two can be installed together on the bracket body, which has a more flexible assembly method.

[0015] As a preferred technical solution for a motor used in a food processing machine, there is an insulation gap between the carbon brush mounting cavity and the stator assembly. The insulation gap includes an axial gap and a radial gap between the carbon brush mounting cavity and the stator assembly.

[0016] Since the carbon brush mounting cavity is suspended on the insulating bracket, the gap between the carbon brush mounting cavity and the stator assembly can serve as an insulating gap. As the insulating gap increases, the problem of withstand voltage breakdown can be reduced. Moreover, since both the axial and radial gaps between the carbon brush mounting cavity and the stator assembly form insulating gaps, effective insulation can be guaranteed in any direction.

[0017] As a preferred technical solution for a motor used in a food processing machine, the insulating bracket includes vertically intersecting reinforcing ribs, the carbon brush mounting cavity is arranged along the extension direction of the reinforcing ribs, the stator core is wound with multiple stator coils distributed circumferentially, and the circumferentially adjacent carbon brush mounting cavities form a clearance portion to avoid the stator coils.

[0018] The perpendicular intersection of the reinforcing ribs ensures the structural strength of the insulation support. Furthermore, since the carbon brush mounting cavity is positioned along the reinforcing ribs, the ribs also contribute to its structural strength. The stator coils are nested between circumferentially adjacent carbon brush mounting cavities, aligning in axial height and reducing axial space requirements.

[0019] As a preferred technical solution for a motor used in a food processing machine, the stator core has a square structure, and the insulation support includes vertically intersecting reinforcing ribs, which are offset by ±10° along the diagonal of the stator core.

[0020] In existing technologies, carbon brushes are typically positioned parallel to the stator core side length. The length of the carbon brush is limited by the structure, and the outer dimensions of the carbon brush are smaller than the stator side length and the inner diameter of the stator coil. In this application, the carbon brush mounting cavity is located on the reinforcing rib, and the reinforcing rib is positioned diagonally along the stator core. That is, the carbon brush mounting cavity has increased depth compared to the prior art, and the length of the carbon brush installed in the carbon brush mounting cavity can be extended accordingly, thereby improving the service life of the carbon brush and thus improving the motor life.

[0021] As a preferred technical solution for motors used in food processing machines, the insulating bracket also forms a bearing housing, and there is a creepage clearance between the bearing housing and the carbon brush mounting cavity.

[0022] The non-direct connection between the bearing housing and the carbon brush mounting cavity creates a gap that increases the creepage distance, preventing carbon powder buildup from causing the carbon brush and bearing to break down under pressure, thus ensuring the safe use of the motor.

[0023] As a preferred technical solution for motors used in food processing machines, a groove with the motor axis as the depth direction is provided between the bearing housing and the carbon brush mounting cavity, and the groove forms a creepage clearance.

[0024] The groove between the bearing housing and the carbon brush mounting cavity forms a creepage clearance. The groove is positioned along the motor axial direction, and its length can be increased by increasing the groove depth without affecting the motor's radial space occupancy. Furthermore, the groove also creates a sinking space to accommodate toner, solving the problem of reduced creepage clearance due to increased toner accumulation, thus ensuring a long creepage clearance even after long-term use.

[0025] As a preferred technical solution for motors used in food processing machines, the carbon brush mounting cavity is positioned at least above the depth of the groove.

[0026] The higher the carbon brush mounting cavity is positioned, the greater the distance between it and the bottom of the groove. Although the increased carbon powder accumulation height will reduce the creepage clearance to some extent, since the carbon brush mounting cavity is higher than the groove depth, the carbon powder accumulation height has little impact on the motor's withstand voltage breakdown, thus ensuring the motor's safe operation.

[0027] As a preferred technical solution for a motor used in a food processing machine, the commutator is fixed to the output end of the shaft, and the insulating bracket is fixed to the side of the stator core near the output end of the shaft, so that the carbon brush mounting cavity is aligned with the commutator.

[0028] By placing the carbon brushes and commutator closer to the output end, the weight of the motor output end is reduced, ensuring that the processing tool connected to the motor output end can be driven by the motor under low load. Positioning the heavier stator and rotor cores relative to the carbon brushes and commutator further away from the motor output end lowers the motor's center of gravity, thereby improving installation stability. During operation of the food processing machine, the lower center of gravity reduces motor vibration, thus minimizing vibration transmission. Simultaneously, the insulating bracket provides both fixation for the carbon brushes and radial support for the shaft, reducing radial runout during operation.

[0029] The present invention discloses a food processing machine, comprising a processing cup assembly with a processing blade assembly, a main unit electrically connected to the processing cup assembly, and a motor for driving the processing blade assembly to rotate. The motor is a previously disclosed motor, which is installed inside the main unit, and the insulating bracket is at least partially radially recessed at the same radial height where the carbon brushes and commutator are installed to form a clearance mounting structure.

[0030] Because a radial concave portion is formed at the same radial height as the carbon brush and commutator, when the motor is used in a food processing machine, the concave portion can be used for assembly. This allows the carbon brush and commutator to avoid the electrical connection structure between the main unit and the processing cup assembly, or the motor's cooling fan and other structures, reducing the space occupied by the motor. While ensuring the motor's insulation capability, this also improves the structural compactness and achieves miniaturization of the main unit. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0032] Figure 1 This is a top view of a motor in one embodiment of the present invention.

[0033] Figure 2 This is a perspective view of a motor in one embodiment of the present invention.

[0034] Figure 3 This is a schematic diagram (1) of the structure of the insulating support in one embodiment of the present invention.

[0035] Figure 4 This is a schematic diagram (2) of the structure of the insulating support in one embodiment of the present invention.

[0036] Figure 5 This is a schematic diagram (3) of the structure of the insulating support in one embodiment of the present invention.

[0037] Figure 6 This is a schematic diagram (4) of the structure of the insulating support in one embodiment of the present invention.

[0038] Figure 7 This is a front view of a motor in one embodiment of the present invention.

[0039] Figure 8 This is a schematic diagram (5) of the structure of the insulating support in one embodiment of the present invention.

[0040] Figure 9 This is a schematic diagram of the structure of a food processing machine according to one embodiment of the present invention.

[0041] Explanation of reference numerals in the attached figures:

[0042] 10-Stator assembly, 110-Stator core, 120-Stator coil;

[0043] 20 - Rotor assembly; 210 - Shaft;

[0044] 30-Carbon brush;

[0045] 40 - Commutator;

[0046] 50-Insulating bracket, 510-Positioning post, 520-Bracket body, 521-Reinforcing rib, 522-Shaft hole, 523-Mounting platform, 524-Bearing chamber, 525-Groove, 526-Supporting rib, 527-Supporting structure, 528-Metal insert, 530 Carbon brush box;

[0047] 60 - Carbon brush mounting cavity;

[0048] 70 - Processing cup assembly;

[0049] 80 - Main unit, 81 - Coupler;

[0050] 90- Fan. Detailed Implementation

[0051] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0052] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0053] Furthermore, in the description of this invention, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0054] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral unit; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. However, specifying a direct connection indicates that the two connected entities do not establish a connection relationship through a transitional structure, but are connected solely by a connecting structure to form a whole. For those skilled in the art, the specific meaning of the above terms in this invention can be understood according to the specific circumstances.

[0055] In this invention, unless otherwise expressly specified and limited, the first feature "on" or "below" the second feature may be in direct contact with the first and second features, or indirect contact through an intermediate medium. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0056] The specific solution adopted is as follows:

[0057] like Figures 1-3As shown, this invention discloses a motor for a food processing machine, including a stator assembly 10, a rotor assembly 20, carbon brushes 30, and a commutator 40. The stator assembly 10 includes a stator core 110, and the rotor assembly 20 includes a shaft 210 and a rotor core mounted on the shaft 210. The shaft 210 can drive the processing blades on the food processing machine to rotate at high speed to cut food. Unlike existing technologies that use insulating plates to address voltage breakdown issues, this application's motor also includes an insulating bracket 50 fixed to the stator assembly 10, integrating the insulating plate and the motor bracket. This simplifies the installation structure, eliminates the need for an insulating plate, and improves production efficiency. Furthermore, the insulating bracket 50 increases insulation strength, improves motor reliability, and ensures effective insulation even after prolonged operation, reducing the risk of burnout due to open circuits. Due to its simplified assembly structure, this application results in better motor stability during operation, less deformation, less motor sparking and vibration, and improved motor noise, electromagnetic interference, and service life. To prevent voltage breakdown between the stator core and commutator 40 of the stator assembly, the carbon brush 30 is fixed to the commutator 40 at the same radial height via an insulating bracket 50, ensuring radial alignment between the carbon brush 30 and the commutator 40. The insulating bracket 50 has a suspended carbon brush mounting cavity 60 on the side facing the stator assembly 10, suspending the carbon brush mounting cavity 60 on the insulating bracket 50. This creates a certain distance between the carbon brush mounting cavity 60 and the stator core of the stator assembly 10, effectively preventing carbon dust from accumulating along the path between the carbon brush mounting cavity 60 and the stator core during long-term use, which could ultimately lead to voltage breakdown between the commutator 40 and the stator core. This ensures safe motor operation and extends motor lifespan. Furthermore, since the carbon brush 30 is fixed at the same radial height as the commutator 40 by the insulating bracket 50 in this application, and the carbon brush 30 is set in the carbon brush mounting cavity 60 suspended above the stator core, this structure can make the carbon brush 30 and the commutator 40 form a certain distance relative to the stator core, avoiding carbon powder accumulation that could cause a short circuit between the carbon brush 30, the commutator 40 and the stator core, thereby ensuring the insulation effect.

[0058] like Figure 3 As shown, this application does not limit the specific installation method of the insulating bracket 50. In one embodiment, the insulating bracket 50 is provided with a through hole, and the stator assembly 10 is provided with a threaded hole corresponding to the through hole. The insulating bracket 50 is connected to the stator assembly 10 by screws passing through the through hole and the threaded hole to fix the insulating bracket 50 to the stator assembly 10. The insulating bracket 50 is also provided with positioning posts 510, and corresponding positioning holes are provided on the stator core 110. The positioning posts 510 can be inserted into the positioning holes to position the insulating bracket 50 before tightening. The number of positioning posts 510 is generally 4, 8, or 12. Further, as Figure 4As shown, the positioning post 510 can also be set on the parallel side of the stator core 110, which directly engages with the outer surface of the stator core 110 for positioning, eliminating the need for positioning holes in the stator core 110. The insulating bracket 50 is typically made of bakelite, nylon fiberglass, or BMC and other heat-resistant insulating materials to ensure insulation performance.

[0059] like Figure 3 , Figure 4 As shown, in one embodiment, the insulating bracket 50 includes a bracket body 520 and a plurality of carbon brush holders 530. The bracket body 520 is used for fixed connection with the stator assembly 10, and the carbon brush holders 530 are integrally formed with the bracket body 520. The carbon brush holders 530 and the bracket body 520 together form a carbon brush mounting cavity 60. The carbon brush mounting cavity 60 is arranged radially, forming a rectangular slot with one end blocked and the other end open. The blocked end is blocked by a rectangular metal insert 528 to block the carbon brush 30. The stator coil 120 is connected to the metal insert 528, and the insert connects to the carbon brush 30 to realize circuit connection. The open side faces the commutator 40 located on the rotating shaft 210 so that the carbon brush 30 contacts the contact plate of the commutator 40. For a four-pole series motor, the four carbon brush holders 530 on the bracket body 520 are 90° to each other. The wall thickness of the carbon brush holder 530 is 1-5mm, preferably 2mm. Furthermore, the carbon brush holder 530 has an external rib structure to ensure structural strength. The ribs are 1-4mm thick, preferably 2mm, to ensure that the strength and positional relationship of the carbon brush holder 530 and the support body 520 remain unchanged. The carbon brush holder 530 and the support body 520 form an integrated structure, preventing loosening of the fit during long-term operation and thus avoiding increased vibration and noise during operation, resulting in better stability of the entire insulating support 50. Moreover, the integrated molding process eliminates the assembly process of the carbon brush 30 plate, improving production efficiency, reducing parts costs, and simultaneously enhancing the overall strength of the insulating support 50.

[0060] In another embodiment, the insulating support 50 includes a support body 520 and multiple carbon brush holders 530. The carbon brush holders 530 and the support body 520 are fixedly connected. For example, the carbon brush holders 530 can be assembled onto the insulating support 50 by riveting or fixing with screws, and each carbon brush holder 530 forms an independent carbon brush mounting cavity 60. The support body 520 and the carbon brush holders 530 are assembled together after they are formed to form the insulating support 50, which can further improve the insulation performance. Moreover, the carbon brushes 30 can be fixed in the carbon brush holders 530 first, and then the two can be installed together on the support body 520, which has a more flexible assembly method. Those skilled in the art will understand that when the carbon brush holders 530 are secondarily fixedly connected to the support body 520, the structure of the carbon brush holders 530 can be the aforementioned independent box structure, or it can be a semi-enclosed structure, with the open side of the carbon brush holders 530 closed by the support body 520 to form the carbon brush mounting cavity 60.

[0061] Furthermore, the specific position of the carbon brush box 530 relative to the insulating bracket 50 is not limited in this application. In practical applications, the carbon brush 30 can be suspended above or below the insulating bracket 50.

[0062] Furthermore, the structure of the insulating support 50 can be a frame structure, or the outer parallel sides can be omitted, retaining only the carbon brush box 530 and the reinforcing rib 521, as shown below. Figure 6 As shown, a support structure 527 is provided at the end of the reinforcing rib 521. The support structure 527 is provided with screw holes that cooperate with the stator core 110, thereby saving material costs of the insulating bracket 50.

[0063] like Figure 2 , Figure 7 As shown, in one embodiment, an insulating gap exists between the carbon brush mounting cavity 60 and the stator assembly 10. Since the carbon brush mounting cavity 60 is suspended on the insulating bracket 50, the gap between the carbon brush mounting cavity 60 and the stator assembly 10 can serve as an insulating gap. Increasing the insulating gap further reduces the risk of breakdown. To ensure effective insulation in any direction, the insulating gap includes an axial gap D1 (e.g., ...) between the carbon brush mounting cavity 60 and the stator assembly 10. Figure 7 (as shown) and radial clearance D2 (as shown) Figure 2 (As shown). Specifically, the carbon brush mounting cavity 60 can be suspended by the insulating bracket 50 at a position away from the stator assembly 10. The position of the carbon brush mounting cavity 60 is away from the stator core 110 on the one hand, forming a vertical distance in the axial direction, and away from the stator coil 120 on the other hand, forming a horizontal distance in the radial direction, thereby ensuring the insulation gap.

[0064] Since motors are used in food processing machines, to avoid the main unit of the food processing machine becoming too large and difficult to store due to excessive space occupied by the motor, such as... Figure 2 , Figure 3 , Figure 7As shown, in one specific embodiment, the insulating support 50 includes perpendicularly intersecting reinforcing ribs 521, with a shaft hole 522 for the rotating shaft 210 to pass through at the intersection. The carbon brush mounting cavity 60 is arranged along the extending direction of the reinforcing ribs 521. The stator core 110 is wound with a plurality of circumferentially distributed stator coils 120. The stator coils 120, wound on the stator core 110, form a certain height in the axial direction. Therefore, the two overlap in axial height, and the circumferentially adjacent carbon brush mounting cavities 60 form a clearance portion to avoid the stator coils 120, which can reduce the axial space occupation. As disclosed in the foregoing embodiments, the carbon brush 30 can be arranged above or below the reinforcing ribs 521. The perpendicular intersection of the reinforcing ribs 521 can ensure the structural strength of the insulating support 50. At the same time, since the carbon brush mounting cavity 60 is arranged along the reinforcing ribs 521, the reinforcing ribs 521 can be used to ensure the structural strength of the carbon brush mounting cavity 60. Figure 5 As shown, in another specific embodiment, only the reinforcing rib 521 can be provided to avoid the stator coil 120. A mounting platform 523 is formed at the center of the entire insulating bracket 50. The reinforcing rib 521 is fixedly connected to the edge of the mounting platform 523. A carbon brush mounting cavity 60 is provided on the plane of the mounting platform 523. The difference from the previous embodiment is that the mounting platform 523 can be set to a smaller radial dimension, and the reinforcing rib 521 is obliquely connected to the mounting platform 523, thereby making the insulating bracket 50 gradually narrow and reducing the radial space occupied. Those skilled in the art will understand that, without limiting the structural form of the reinforcing rib 521 on the insulating bracket 50 and the extension direction of the carbon brush mounting cavity 60, a clearance portion can also be formed between circumferentially adjacent carbon brush mounting cavities 60 to avoid the stator coil 120. The clearance portion, combined with the suspended carbon brush mounting cavity 60, can reduce the radial installation space of the motor while ensuring the withstand voltage breakdown between the commutator 40 and the stator core.

[0065] In existing technical solutions, the carbon brush 30 is typically arranged parallel to the side length of the stator core 110. The length of the carbon brush 30 is structurally limited, and its outer dimensions are smaller than the stator side length and the inner diameter of the stator coil 120. In one specific embodiment of this application, such as... Figure 2 , Figure 3 , Figure 7 As shown, the stator core 110 has a square structure with a side length of 60-120mm, and the diagonal side dimensions correspond to the square dimensions. The insulating bracket 50 includes perpendicularly intersecting reinforcing ribs 521, which are offset by ±10° along the diagonal of the stator core 110. The carbon brush mounting cavity 60 is located on the reinforcing ribs 521, which are also positioned diagonally along the stator core 110. For a square stator core 110, the diagonal length is longer than the side length, meaning the carbon brush mounting cavity 60 has increased depth compared to existing technologies. Simultaneously, it avoids obstruction by the stator coil 120, allowing the carbon brush 30 installed within the carbon brush mounting cavity 60 to be correspondingly extended, reaching more than 1.4 times its original length. This improves the service life of the carbon brush 30 and consequently, the motor's lifespan.

[0066] It is understood that, for ease of description, the stator core 110 is described as a square structure. In practical applications, the stator core 110 may also be a square-like structure, a rounded square structure, etc., all of which are within the scope of protection claimed in this application.

[0067] like Figure 3 , Figure 6 As shown, in one embodiment, the insulating bracket 50 further forms a bearing chamber 524, which is formed at the center of the insulating bracket 50 and arranged around the shaft hole 522. A creepage clearance exists between the bearing chamber 524 and the carbon brush mounting cavity 60 to ensure the safe operation of the motor. The bearing chamber 524 and the carbon brush mounting cavity 60 are not directly connected; the resulting gap increases the creepage distance and prevents carbon powder accumulation that could cause the carbon brush 30 to break down under pressure with the bearing.

[0068] Specifically, a groove 525 with the motor axial direction as its depth is provided between the bearing housing 524 and the carbon brush mounting cavity 60. The groove 525 forms a creepage clearance. The groove 525 is set along the motor axial direction, and the length of the creepage clearance can be increased by increasing the groove depth without affecting the radial space occupied by the motor. In addition, the groove 525 can also form a sink space to accommodate carbon powder, solving the problem of the creepage clearance being reduced due to the increased height of carbon powder accumulation, and ensuring a long creepage clearance even after long-term use. Furthermore, the carbon brush mounting cavity 60 is set at least higher than the depth of the groove 525. The higher the carbon brush mounting cavity 60 is set, the greater the distance from its bottom surface to the groove 525. Although the increased height of carbon powder accumulation will reduce the creepage clearance to some extent, since the carbon brush mounting cavity 60 is higher than the depth of the groove 525, the impact of the carbon powder accumulation height on the motor's withstand voltage breakdown is small, ensuring the safety of motor operation. In addition, in order to shorten the radial distance between the carbon brush box 530 and the commutator 40 while maintaining the length of the creepage clearance, the carbon brush box 530 extends radially into the groove 525 and is higher than the depth of the groove 525. A support rib 526 is provided inside the groove 525 to form a support at the bottom of the carbon brush box 530 and maintain the structural strength of the carbon brush box 530.

[0069] like Figure 2As shown, in one embodiment, the commutator 40 is fixed to the output end of the shaft 210, and the insulating bracket 50 is fixed to the stator core 110 near the output end of the shaft 210, so that the carbon brush mounting cavity 60 is aligned with the commutator 40. By placing the carbon brush 30 and the commutator 40 near the output end of the shaft 210, the stator assembly 10 is located below the carbon brush mounting cavity 60. During long-term use, the carbon dust generated falls downward from the carbon brush mounting cavity 60, avoiding accumulation near the carbon brush mounting cavity 60. In addition, combined with the insulating gap formed between the carbon brush mounting cavity 60 and the stator assembly 10 disclosed in the previous embodiment, even if a small amount of carbon dust accumulates, the problem of withstand voltage breakdown can be directly avoided. Furthermore, placing the carbon brush 30 and commutator 40 near the output end of the shaft 210 reduces the weight of the motor output end, ensuring that the processing tool connected to the motor output end can be driven by the motor under low load. Positioning the heavier stator core 110 and rotor core relative to the carbon brush 30 and commutator 40 away from the motor output end lowers the motor's center of gravity, thereby improving the motor's installation stability. During the operation of the food processing machine, the lower center of gravity reduces vibration during operation, thus reducing vibration transmission. Simultaneously, the insulating bracket 50 serves two purposes: firstly, it secures the carbon brush 30, forming a support structure that ensures reliable fixation and makes the assembly of the carbon brush 30 with the stator assembly 10 more compact, thereby shortening the motor's axial height; secondly, it provides radial support to the shaft 210, reducing radial runout during operation.

[0070] like Figure 9As shown, a food processing machine disclosed in one embodiment of the present invention includes a processing cup assembly 70 with a processing blade assembly, a main unit 80 electrically connected to the processing cup assembly 70, and a motor for driving the processing blade assembly to rotate. The motor is a previously disclosed motor, and the motor is mounted inside the main unit 80. The insulating bracket 50 is at least partially radially recessed at the same radial height where the carbon brushes 30 and the commutator 40 are located to form a clearance mounting structure. The insulating bracket 50 is at least partially radially recessed at the same radial height where the carbon brushes 30 and the commutator 40 are located. Specifically, in one embodiment, the insulating bracket 50 can be configured to have multiple concave portions in the same circumferential direction, and in another embodiment, it can be configured to be entirely concave in the same circumferential direction, thereby forming a radial contraction. When the motor is applied to a food processing machine, the concave portion can be used for assembly, allowing the carbon brush 30 and the commutator 40 to avoid the electrical connection structure between the host 80 and the processing cup assembly 70 (such as the host 80 being equipped with a coupler 81 for electrical signal transmission, the concave portion can directly avoid the coupler 81) or the motor's cooling fan 90, etc. The concave portion of the coupler 81 and the carbon brush 30 and the commutator 40 on one side is located at the same radial height, so that the assembly of the coupler 81 does not increase the axial height of the host 80, improving the utilization rate of the internal space of the host 80. At the same time, the structure of the coupler 81 does not interfere with the structure of the motor, reducing the space occupied by the motor. While ensuring the insulation capability of the motor, the structural compactness is improved, ensuring the reliability of the whole machine operation. To further improve the utilization of the internal space of the host 80, the carbon brush 30 and the coupler 81 have the same height in the axial direction, and the coupler 81 is located between the circumferentially adjacent carbon brushes 30. Since a gap is formed between the circumferentially adjacent carbon brushes 30, setting the coupler 81 between the circumferentially adjacent carbon brushes 30 to achieve axial overlap can reduce the height of the whole machine and effectively utilize the space. At the same time, since the coupler 81 extends into the carbon brush gap in the radial direction, the radial dimension occupied is reduced.

[0071] It should be noted that the definition of the concave area in this invention can be understood as follows: the hollow area formed by the same radial height of the commutator 40 or carbon brush 30 and the space above that radial height in the internal space of the host 80 constitutes the concave area, and the installation position of the coupler 81 is included within the concave space.

[0072] The technical solutions protected by this invention are not limited to the above embodiments. It should be noted that any combination of the technical solutions of any embodiment with one or more other embodiments is within the protection scope of this invention. Although the invention 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 invention are within the scope of protection claimed by this invention.

Claims

1. A motor for a food processing machine, comprising a stator assembly, a rotor assembly, carbon brushes, and a commutator, wherein the stator assembly includes a stator core, and the rotor assembly includes a shaft and a rotor core mounted on the shaft, characterized in that, The motor also includes an insulating bracket fixed to the stator assembly. The carbon brush is fixed to the commutator at the same radial height via the insulating bracket. The insulating bracket has a suspended carbon brush mounting cavity on the side facing the stator assembly. The insulating bracket also forms a bearing chamber. A groove with the motor axial direction as the depth direction is provided between the bearing chamber and the carbon brush mounting cavity.

2. The motor for a food processing machine according to claim 1, characterized in that, The insulating support includes a support body and multiple carbon brush boxes. The carbon brush boxes and the support body are an integral structure, and the carbon brush boxes and the support body together form the carbon brush mounting cavity. Alternatively, the carbon brush box and the bracket body are fixedly connected, and each carbon brush box forms an independent carbon brush mounting cavity.

3. The motor for a food processing machine according to claim 1, characterized in that, An insulating gap exists between the carbon brush mounting cavity and the stator assembly, the insulating gap including an axial gap and a radial gap disposed between the carbon brush mounting cavity and the stator assembly.

4. The motor for a food processing machine according to claim 1, characterized in that, The insulating support includes vertically intersecting reinforcing ribs, the carbon brush mounting cavity is arranged along the extension direction of the reinforcing ribs, the stator core is wound with a plurality of stator coils distributed circumferentially, and the circumferentially adjacent carbon brush mounting cavities form a clearance portion to avoid the stator coils.

5. A motor for a food processing machine according to claim 1 or 4, characterized in that, The stator core has a square structure, and the insulating support includes vertically intersecting reinforcing ribs, which are offset by ±10° along the diagonal of the stator core.

6. The motor for a food processing machine according to claim 1, characterized in that, There is a creepage gap between the bearing housing and the carbon brush mounting cavity, and the groove forms the creepage gap.

7. The motor for a food processing machine according to claim 6, characterized in that, The carbon brush mounting cavity is positioned at least above the depth of the groove.

8. The motor for a food processing machine according to claim 1, characterized in that, The commutator is fixed to the output end of the shaft, and the insulating bracket is fixed to the stator core near the output end of the shaft so that the carbon brush mounting cavity is aligned with the commutator.

9. A food processing machine, characterized in that, include: A machining cup assembly equipped with a machining tool set; The host computer is electrically connected to the processing cup assembly; The motor that drives the machining tool set to rotate is the motor as described in any one of claims 1-8, the motor is installed in the host, and the insulating bracket is at least partially radially recessed at the same radial height where the carbon brush and the commutator are located to form a clearance mounting structure.

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