Brushless motor of portable food processor and portable food processor

Abstract

The utility model relates to a brushless motor of a portable food processor and the portable food processor, and the brushless motor comprises a motor housing which is provided with an inner cavity; the stator assembly is mounted in the inner cavity and comprises a stator bracket and a stator winding wound on the stator bracket; the rotor assembly is arranged in the stator assembly and comprises a rotor iron core, magnetic steel embedded in the rotor iron core and a rotor shaft fixed in the rotor iron core in a penetrating mode, and the two sides of the rotor shaft penetrate through the motor shell; the motor shell is provided with a lower end plate arranged at the bottom of the inner cavity, a plurality of slotted holes are formed in the lower end plate in a penetrating mode, and the slotted holes are distributed in a non-centrosymmetric mode relative to the axis of the rotor. According to the technical scheme of the utility model, electromagnetic interference on other components at the periphery of the brushless motor is avoided, and the safety performance is greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of food processing machines, in particular to a brushless motor of a portable food processing machine which can dissipate heat and has good safety performance, and the portable food processing machine. Background Art

[0002] At present, food processors have been used more and more, which mainly cut and crush food by processing tools arranged at the bottom of the processing chamber of the food processor, so that the food reaches the required crushing degree to meet the eating needs of users.

[0003] The application number is CN202021171400.6, and the name of the invention is "A motor assembly of a food processor and a food processor with an ultra-thin host". It discloses that the motor body, the control board assembly and the battery assembly are stacked, the control board assembly is arranged to fit the axial end of the motor body, the upper end of the motor housing is fitted on the host housing, and no heat dissipation holes are arranged on the upper end of the motor housing; and the control board assembly is installed on the bottom shell of the motor housing, and no heat dissipation holes are provided. However, the technical problem existing in this technical solution is that the coil winding assembly will generate more heat, and the motor will generate more heat after a long period of work. If this heat is not discharged from the motor in time, it will affect the performance of the motor and shorten the actual service life of the components.

[0004] The application number is CN201921853579.0, and the name of the invention is "New DC Motor". It discloses that the front cover is used as support and protection, and the circuit board covers the lower opening of the front cover, replacing the rear cover. The upper end of the front cover of the motor has a support part, and the support part has a connecting block, and a ventilation and heat dissipation port formed between the connecting blocks. The ventilation and heat dissipation port is for internal heat dissipation of the motor, and the circuit board as the rear cover is provided with a notch, and the notch is used to dissipate heat for the motor. The front and rear covers are respectively provided with heat dissipation ports, and convection is formed at the upper and lower ends of the motor. However, the technical problem existing in this technical solution is that: the upper end of the front end cover has multiple pairs of ventilation and heat dissipation ports which are relatively arranged, and the multiple ventilation and heat dissipation ports are distributed symmetrically with the center. The magnetic lines of force on the stator assembly can pass through the ventilation and heat dissipation ports, and the magnetic lines of force can form a closed curve between the two opposite ventilation and heat dissipation ports, so that the S pole and the N pole on the stator assembly can form a closed curve. In this way, the closed magnetic lines of force will generate electromagnetic interference to other components arranged around the motor; for example, when the circuit board is arranged around the motor, the electromagnetic interference will cause the signal recognition error of the circuit board, and then some control modules on the circuit board will be falsely triggered.

[0005] The above disclosed technical solutions all have the following technical problem: How to achieve heat dissipation of the motor while preventing the motor from generating electromagnetic interference to other surrounding components to ensure that other components can operate normally. Utility Model Content

[0006] The utility model aims to provide a brushless motor for a portable food processor, so as to solve the problem of how to achieve heat dissipation of the motor while avoiding electromagnetic interference of the motor to other surrounding components, thereby ensuring that other components can operate normally.

[0007] In order to solve the above technical problems, the utility model provides a brushless motor for a portable food processor, comprising:

[0008] A motor housing having an inner cavity;

[0009] A stator assembly is installed in the inner cavity, comprising a stator bracket and a stator winding wound on the stator bracket;

[0010] A rotor assembly is disposed in the stator assembly, comprising a rotor core, a magnetic steel embedded in the rotor core, and a rotor shaft passing through and fixed in the rotor core, wherein both sides of the rotor shaft pass through the motor housing;

[0011] The motor housing has a lower end plate arranged at the bottom of the inner cavity, and a slot hole is formed through the lower end plate. There are multiple slot holes, and the slot holes are distributed in a non-centrally symmetrical manner relative to the axis of the rotor.

[0012] Preferably, the lower end plate includes a spacer portion provided between two adjacent slot holes, the spacer portion circumferentially spaced the slot holes, and the slot holes are provided on one side of a line connecting the geometric center of the slot hole and the axis of the rotor, and the spacer portion is provided on the other side.

[0013] Preferably, the inner cavity has an installation space surrounding the outer circumference of the rotor assembly, the stator assembly is arranged in the installation space, and a projection of part of the installation space on the horizontal plane coincides with the slot hole.

[0014] Preferably, the stator assembly also includes a stator core, the stator bracket is clamped outside the stator core, the stator core includes a plurality of pairs of teeth arranged opposite to each other, and a yoke connecting the teeth, the stator winding is arranged outside the teeth, and the projection of one of the teeth in each pair on the horizontal plane coincides with the slot hole.

[0015] Preferably, the arc length of the spacer along the circumferential direction is greater than the maximum arc length of the slot along the circumferential direction.

[0016] Preferably, the axial spacing between the stator winding and the slot hole is 1-3 mm.

[0017] Preferably, the projection area of ​​the slot on the horizontal plane is S1, the projection area of ​​the lower end plate on the horizontal plane is S2, and S1:S2 is 0.05-0.25.

[0018] The utility model also provides a portable food processor, including a brushless motor, a mainframe housing and a brushless motor drive plate of the portable food processor, wherein the brushless motor is hoisted in the mainframe housing, and the brushless motor drive plate is arranged below the lower end plate of the brushless motor.

[0019] Preferably, the portable food processor also includes a battery electrically connected to the brushless motor, the main body housing has a closed sealed cavity, the brushless motor and the battery are both installed in the sealed cavity, and the single continuous working time of the battery is less than or equal to 600S.

[0020] Preferably, the motor housing includes an upper end cover and a lower end cover which are assembled and matched with each other, and the upper end cover and the lower end cover are respectively provided with openings at the place where the two are closed, and one of the outer side surfaces of the upper end cover and the lower end cover is provided with a mounting portion, and the mounting portion is locked with the main housing, and one end of the mounting portion close to the opening is flush with the opening.

[0021] The beneficial effects of the utility model are:

[0022] 1. The utility model provides a brushless motor for a portable food processor, which is achieved by installing a stator assembly and a rotor assembly in the inner cavity of a motor housing, and the stator assembly is arranged on the outer periphery of the rotor assembly, the rotor assembly includes a rotor shaft passing through the motor housing, and a lower end plate is formed with slots, and the slots are non-center-symmetrically distributed relative to the axis of the rotor; based on this, when a part of the magnetic lines of force pass through a slot, since the slots are non-center-symmetrically distributed relative to the axis of the rotor, that is, each slot is a closed end plate on the opposite side of the rotor axis, the part of the magnetic lines of force passing through the slot cannot form a closed curve, and thus cannot generate magnetic field, further unable to generate electromagnetic interference to other components around the brushless motor, especially electromagnetic interference to the brushless motor drive board below the brushless motor, thereby effectively ensuring the normal operation of the portable food processor and greatly improving the safety performance; the rotation of the rotor assembly drives the air flow around it to dissipate the heat in the brushless motor from the slot hole, and the slot hole can also be used to dissipate heat in the brushless motor; secondly, only the slot hole is set on the lower end plate, in order to prevent a very small number of magnetic lines of force penetrating from the slot hole from forming a closed loop in the longitudinal direction, thereby avoiding electromagnetic interference to other components around the brushless motor.

[0023] 2. Based on the fact that the stator assembly is arranged in the installation space, the projection of part of the installation space on the horizontal plane coincides with the slot hole. Since the stator assembly generates more heat than the rotor assembly, the slot hole is aligned with the installation space so that the slot hole is closest to the stator assembly, shortening the heat dissipation path of the stator assembly. The slot hole can quickly discharge the heat from the stator assembly, thereby improving the heat dissipation efficiency inside the brushless motor.

[0024] 3. By setting the arc length of the spacer along the circumferential direction to be greater than the maximum arc length of the slot along the circumferential direction on the same circumference, since the spacer is used to circumferentially space the slots, it is further ensured that there is no slot on the opposite side of each slot relative to the rotor axis, and the end plate is completely closed, so as to avoid a part of another slot on the opposite side of the slot relative to the rotor axis, thereby effectively ensuring that the magnetic lines of force penetrating from each slot cannot form a closed curve, and more effectively avoiding electromagnetic interference.

[0025] 4. The axial spacing between the stator winding and the slot hole is set to 1-3mm. There is a small gap within the axial spacing. Based on this, when the axial spacing between the stator winding and the slot hole is 1-3mm, the brushless motor is kept small, more magnetic lines of force can form a closed curve in the inner cavity, and the magnetic lines of force can be minimized from leaking out of the slot hole. On the one hand, the loss of magnetic lines of force is reduced, and on the other hand, it is also beneficial to reduce electromagnetic interference; when the axial spacing between the stator winding and the slot hole is greater than 3mm, the axial spacing is too large, resulting in an increase in the volume of the brushless motor, thereby increasing the volume of the host, which is not conducive to portability; when the axial spacing between the stator winding and the slot hole is less than 1mm, more magnetic lines of force are likely to leak out of the slot hole, increasing the loss of magnetic lines of force. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 The present invention is a schematic structural diagram of a brushless motor of a portable food processor in one embodiment of the present invention.

[0028] Figure 2 A schematic diagram of the structure of the stator assembly in a brushless motor.

[0029] Figure 3 for Figure 1 Schematic diagram of the structure of the lower end cover shown.

[0030] Figure 4 for Figure 1 A cross-sectional schematic diagram of the brushless motor shown.

[0031] Figure 5 The figure is a schematic structural diagram of a portable food processor in one embodiment of the present invention.

[0032] Figure 6 for Figure 5 Schematic diagram of the structure of the barrier and the brushless motor drive board shown.

[0033] Figure 7 for Figure 5 A schematic cross-sectional view of a portable food processor is shown.

[0034] Figure 8 for Figure 1 Schematic diagram of the structure of the upper end cover shown.

[0035] The names of the components in the figure are as follows:

[0036] 1. Mainframe housing; 11. Sealed cavity; 12. Isolation gap; 13. Mainframe upper cover; 131. Second mounting column; 14. Base; 141. Third mounting column; 2. Brushless motor; 21. Motor housing; 22. Stator assembly; 221. Stator bracket; 223. Stator core; 2231. Tooth; 2232. Yoke; 23. Rotor assembly; 233. Rotor shaft; 24. Upper end cover; 241. Upper end plate; 242. Mounting part; 25. Lower end cover; 251. Lower end plate; 2511. Spacer; 2512. Slot; 27. Inner cavity; 3. Brushless motor drive board; 31. Board body; 32. MOS tube; 33. Terminal block; 34. Extension; 4. Battery; 5. Barrier; 51. Barrier body; 52. Side; 521. First mounting column. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0038] See also Figure 1-Figure 4 A brushless motor for a portable food processor includes a brushless motor 2 including a motor housing 21, a stator assembly 22 and a rotor assembly 23. The stator assembly 22 includes a stator core 223, a stator bracket 221 and a stator winding. The rotor assembly 23 includes a rotor core, a magnetic steel and a rotor shaft 233. The motor housing 21 includes an upper end cover 24 and a lower end cover 25, wherein the upper end cover 24 includes an upper end plate 241, and the lower end cover 25 includes a lower end plate 251.

[0039] The lower end cover 25 is installed and matched with the upper end cover 24 up and down, and an inner cavity 27 is formed with the upper end cover 24; the stator assembly 22 is installed in the inner cavity 27, including a stator bracket 221 and a stator winding wound on the stator bracket 221; the rotor assembly 23 is arranged in the stator assembly 22, including a rotor core, a magnet embedded in the rotor core, and a rotor shaft 233 fixed in the rotor core, and the two sides of the rotor shaft 233 pass through the upper end cover 24 and the lower end cover 25 respectively; wherein, the upper end cover 24 includes an upper end plate 241 arranged at the top of the inner cavity 27, and the lower end cover 25 includes a lower end plate 251 arranged at the bottom of the inner cavity 27; a slot hole 2512 is formed through the lower end plate 251, and a plurality of slot holes 2512 are provided, and the slot holes 2512 are non-centrally symmetrically distributed relative to the axis of the rotor. In this embodiment, since the upper end plate and the host housing are installed and matched, if a slot is set on the upper end plate, there is a risk of water entering the brushless motor. Of course, in other embodiments, the host housing is well sealed and sealing is not considered, and the slot 2512 can also be formed on the upper end plate 241.

[0040] It should be noted that there are two or more slots 2512, the axis of the rotor refers to the geometric center of the rotor, and the axis of the rotor is on the central axis of the rotor shaft 233, and the rotor rotates around the axis. The slots 2512 are non-center-symmetrically distributed relative to the axis of the rotor, which means that each slot 2512 rotates 180° around the axis of the rotor and there is no slot 2512 that overlaps with the slot 2512, that is, each slot 2512 is not provided at the center-symmetrical position of the rotor shaft 233, and the cross section of the stator assembly 22 is annular.

[0041] It can be understood that the rotation of the rotor assembly 23 drives the air flow around it to move, thereby realizing the heat in the brushless motor 2 to be dissipated from the slot 2512, and the slot 2512 can be used to dissipate heat in the brushless motor 2. Since each pair of S poles and N poles on the stator assembly 22 are centrally symmetrically arranged relative to the axis of the rotor, the magnetic lines of force of a pair of S poles and N poles form a closed curve when there is no shielding of components. Once the magnetic lines of force form a closed curve, it may cause electromagnetic interference to other components around the brushless motor 2, especially to the brushless motor drive board below the brushless motor. Based on this principle, when a part of the magnetic lines of force pass through a slot 2512, since the slots 2512 are non-center-symmetrically distributed relative to the axis of the rotor, that is, each slot 2512 is not provided with a slot 2512 at the center-symmetrical position relative to the center of the rotor shaft 233, that is, each slot 2512 is opposite to the center of the rotor shaft 233. There is a closed end plate, and this part of the magnetic lines of force passing through the slot 2512 cannot form a closed curve, and cannot generate a magnetic field, and further cannot generate electromagnetic interference to other components on the periphery of the brushless motor 2, thereby effectively ensuring the normal operation of the portable food processor and greatly improving the safety performance; therefore, the slot 2512 not only meets the heat dissipation requirements of the inner cavity 27 of the brushless motor 2, but also meets the safety performance requirements of the entire machine.

[0042] Secondly, if magnetic lines of force penetrate through the slot 2512 close to the N pole in a pair of N poles and S poles, a very small number of these magnetic lines of force may turn along the side of the brushless motor 2 and form a closed curve with the corresponding S pole, that is, a closed curve is formed along the longitudinal direction between the pair of N poles and S poles. Based on this principle, only the slot 2512 is set on the lower end plate 251 to prevent a very small number of magnetic lines of force penetrating from the slot 2512 from forming a closed loop in the longitudinal direction, thereby interfering with the magnetic field generated by other peripheral components of the brushless motor 2.

[0043] Specifically, Figure 3 As shown, the lower end plate 251 includes a spacer 2511 disposed between two adjacent slots 2512, and the spacer 2511 is a closed plate body 31. The spacer 2511 distributes the slots 2512 circumferentially, and the slots 2512 are disposed on one side of the line connecting the geometric center of the slots 2512 and the center of the rotor shaft 233, and the spacer 2511 is disposed on the other side, that is, the slots 2512 are disposed on the opposite side of the center of the rotor shaft 233. The slots 2512 are not disposed at the central symmetric position of each slot 2512 relative to the center of the rotor shaft 233, so that the magnetic lines of force penetrating from the slots 2512 cannot form a closed curve, and thus cannot generate a magnetic field, and further cannot generate electromagnetic interference to other components on the periphery of the brushless motor 2, thereby effectively ensuring the normal operation of the portable food processor and greatly improving the safety performance.

[0044] More specifically, on the same circumference, the arc length of the spacer 2511 along the circumferential direction is greater than the maximum arc length of the slot 2512 along the circumferential direction. The spacer 2511 is used to circumferentially space the slots 2512, further ensuring that no slot 2512 is provided on the opposite side of each slot 2512 relative to the center of the rotor shaft 233, and the end plate is completely closed, thereby preventing a portion of another slot 2512 from being exposed on the opposite side of the slot 2512 relative to the center of the rotor shaft 233, thereby effectively ensuring that the magnetic lines of force penetrating from each slot 2512 cannot form a closed curve, and more effectively avoiding electromagnetic interference.

[0045] It should be noted that the slot 2512 can be configured to be an arc strip along the circumferential direction, and can be configured to be a rectangle, a square, or various other special shapes. It can be understood that in this embodiment, the slot 2512 is provided on the lower end plate 251, and the slot 2512 is configured to be an arc strip along the circumferential direction. The slot 2512 has a maximum arc length and a minimum arc length along the circumferential direction. The maximum arc length of the slot 2512 is located on the side away from the axis of the rotor, and the minimum arc length of the slot 2512 is located on the side close to the axis of the rotor.

[0046] In one embodiment, Figure 4 As shown, the inner cavity 27 has an installation space surrounding the outer periphery of the rotor assembly 23, and the stator assembly 22 is arranged in the installation space. The projection of part of the installation space on the horizontal plane coincides with the slot 2512, and a plurality of slots 2512 are distributed at intervals at the projection of the installation space. This embodiment is provided with three slots 2512.

[0047] It can be understood that the stator assembly 22 generates more heat than the rotor assembly 23. The slot 2512 is aligned with the installation space so that the slot 2512 is closest to the stator assembly 22, shortening the heat dissipation path of the stator assembly 22. The slot 2512 can quickly discharge the heat on the stator assembly 22, thereby improving the heat dissipation efficiency inside the brushless motor 2.

[0048] Furthermore, in order to achieve rapid heat dissipation of the stator assembly 22, the stator assembly 22 further includes a stator core 223, the stator bracket 221 is clamped outside the stator core 223, the stator core 223 includes a plurality of pairs of teeth 2231 arranged opposite to each other, and a yoke 2232 connecting the teeth 2231, the stator winding is arranged outside the teeth 2231, and the projection of one of the teeth 2231 in each pair on the horizontal plane coincides with the slot 2512. Of course, in other embodiments, the slot 2512 can also be aligned with the gap between two adjacent teeth 2231.

[0049] It can be understood that the stator winding generates the most heat on the stator assembly 22. The stator winding is wound outside the tooth portion 2231. The slot 2512 is aligned with the tooth portion 2231, that is, aligned with the stator winding, so that the slot 2512 is closest to the stator winding, shortening the heat dissipation path of the stator assembly 22. The slot 2512 quickly discharges the heat on the stator winding to the outside of the brushless motor 2. In this embodiment, three pairs of teeth 2231 are provided, and correspondingly, there are three pairs of S poles and N poles. Each pair of teeth 2231 and the stator winding wound thereon correspond to a pair of S poles and N poles. Only one tooth 2231 in a pair of teeth 2231 is aligned with the slot 2512, and the other tooth 2231 in a pair of teeth 2231 is aligned with the closed end plate. Only one pole in a pair of S poles and N poles is cooled, so that the magnetic lines of force penetrating from the slot 2512 cannot form a closed curve, and thus cannot generate a magnetic field, effectively shielding the electromagnetic interference to other peripheral components. Therefore, it is possible to achieve rapid heat dissipation of the stator assembly 22 in the shortest path, while effectively avoiding electromagnetic interference.

[0050] Specifically, Figure 4 As shown, the axial spacing between the stator winding and the slot hole 2512 is 1-3 mm, and preferably the axial spacing is 1.7 mm.

[0051] It should be noted that, in this embodiment, the slot 2512 is arranged on the lower end plate 251, and the vertical distance between the lowermost end of the stator winding and the slot 2512 is the axial spacing between the stator winding and the slot 2512, and there is a smaller gap within the axial spacing.

[0052] It is understandable that when the axial spacing between the stator winding and the slot 2512 is 1-3mm, the brushless motor 2 is kept small, more magnetic lines of force can form a closed curve in the inner cavity 27, and the magnetic lines of force can be minimized from leaking out of the slot 2512. On the one hand, the loss of magnetic lines of force is reduced, and on the other hand, it is also beneficial to reduce electromagnetic interference. When the axial spacing between the stator winding and the slot 2512 is greater than 3mm, the axial spacing is too large, resulting in an increase in the volume of the brushless motor 2, thereby increasing the volume of the host, which is not conducive to portability. When the axial spacing between the stator winding and the slot 2512 is less than 1mm, more magnetic lines of force are likely to leak out of the slot 2512, increasing the loss of magnetic lines of force.

[0053] like Figure 1 As shown, the height of the upper end cover 24 is smaller than the height inside the lower end cover 25, the slot 2512 is arranged on the lower end plate 251, the volume of the upper end cover 24 is smaller than the volume of the lower end cover 25, and the slot 2512 is arranged on the lower end cover 25 with a larger volume. While satisfying the heat dissipation of the slot 2512, the structural strength of the motor housing 21 can also be guaranteed.

[0054] like Figure 3 As shown, the projection area of ​​the slot 2512 on the horizontal plane is S1, the projection area of ​​the lower end plate 251 on the horizontal plane is S2, and S1:S2 is 0.05-0.25. Preferably, S1:S2 is 0.09, and S1 is 130.2 mm 2 , S2 is 1444.5mm 2 .

[0055] It can be understood that there are three slots 2512 on the lower end plate 251, S1 is the sum of the areas of the three slots 2512; the lower end plate 251 has a through hole passing through the rotor shaft 233, and S2 is the projected area of ​​the entire lower end plate 251 minus the through hole. When S1:S2 is 0.05-0.25, the area of ​​the slot 2512 is sufficient to meet the heat dissipation requirements of the stator winding, allowing the stator winding to dissipate heat quickly, while also ensuring the structural strength of the lower end plate 251. When S1:S2 is less than 0.05, the area of ​​the slot 2512 is too small, resulting in a too slow speed of extracting the heat generated on the stator winding, making it difficult to meet the heat dissipation requirements of the stator winding, causing the temperature of the inner cavity 27 to rise too quickly, affecting the service life of the stator assembly 22 and the rotor assembly 23. When S1:S2 is greater than 0.25, the area of ​​the slot 2512 is too large, greatly reducing the structural strength of the lower end plate 251.

[0056] See also Figure 5-Figure 8 The embodiment of the utility model also provides a portable food processor, including a brushless motor of the portable food processor and a main body housing 1, wherein the brushless motor 2 is hoisted in the main body housing 1, so that the miniaturized brushless motor 2 is installed in the main body housing 1, and the portable food processor is driven by the brushless motor 2. Figure 1-Figure 4 A portable food processor also includes a brushless motor drive board 3, a battery 4 and a barrier 5.

[0057] like Figure 5 , Figure 7 As shown, the host housing 1 has a closed sealed cavity 11; the brushless motor 2 includes a motor housing 21 installed in the sealed cavity 11, and the stator assembly 22 is installed in the inner cavity 27 of the motor housing 21. The motor housing 21 is penetrated by a slot 2512 connected to the inner cavity 27, and the lower end cover 25 at least partially surrounds the stator assembly 22 and the rotor assembly 23; the brushless motor drive board 3 and the battery 4 are both arranged in the sealed cavity 11 and are both located below the lower end cover 25, and the brushless motor drive board 3 is electrically connected to the brushless motor 2 and the battery 4 respectively; wherein, there is an isolation gap 12 between the brushless motor drive board 3 and the lower end cover 25, or, there is an isolation gap 12 between the battery 4 and the brushless motor drive board 3 and the lower end cover 25.

[0058] It should be noted that a brushless motor drive board 3 may be provided below the brushless motor 2, or a battery 4 and a brushless motor drive board 3 may be provided side by side below the brushless motor 2. The slot 2512 may be used to dissipate heat inside the brushless motor 2, and the slot 2512 may be provided only on the upper end or the lower end of the motor housing 21. The portable food processor may be a miniaturized food processor such as a juicer. The lower end cover 25 may partially surround the stator assembly 22 and the rotor assembly 23, or the lower end cover 25 may completely surround the stator assembly 22 and the rotor assembly 23. The brushless motor drive board 3 controls the start and stop of the brushless motor 2, and controls the battery 4 to power or cut off the power to the brushless motor 2.

[0059] It is understandable that since there are components of different heights on the brushless motor drive board 3, these components require installation space, so an isolation space is set below the lower end cover 25 of the brushless motor 2, so that there is space for installing components between the brushless motor 2 and the brushless motor drive board 3; secondly, an isolation space is set between the lower end cover 25 and the brushless motor drive board 3, so that there is a certain safety distance between the components on the brushless motor drive board 3 and the stator assembly 22 and the rotor assembly 23, effectively avoiding the magnetic field generated by the stator assembly 22 and the rotor assembly 23 to produce electromagnetic interference to the components, thereby ensuring the accuracy of signal identification of the components on the brushless motor drive board 3, effectively avoiding the occurrence of false triggering, and greatly improving the safety of the portable food processor. When the battery 4 is also below the lower end cover 25, the provision of an isolation space can also prevent the battery 4 from being subjected to electromagnetic interference caused by the stator assembly 22 and the rotor assembly 23.

[0060] Furthermore, the slot 2512 utilizes the rotation of the rotor assembly 23 to drive the air flow around it, thereby dissipating the heat in the brushless motor 2 from the slot 2512. Therefore, the inner cavity 27, the slot 2512, the sealed cavity 11 and the isolation gap 12 form a longitudinal heat dissipation self-circulation. Due to the existence of the isolation gap 12, the longitudinal heat dissipation is not blocked, so that the heat in the sealed cavity 11 can be quickly and autonomously digested, which not only realizes the digestion of the heat generated inside the brushless motor 2, but also helps to extend the service life of other components in the main body housing 1.

[0061] Specifically, the brushless motor drive board 3 includes a board body 31 installed in the sealed cavity 11, and a capacitor arranged on the board body 31, the capacitor is electrically connected to the battery 4, and the capacitor protrudes from the upper surface of the board body 31 and extends into the isolation gap 12.

[0062] It can be understood that, among the components arranged on the brushless motor drive board 3, the axial height of the capacitor within the board body 31 is the highest, and the axial height of the isolation gap 12 meets the height setting requirements of the capacitor, which also meets the height setting requirements of other components on the board body 31. The height of the isolation gap 12 is sufficient to meet the height setting requirements of components of different heights on the board body 31.

[0063] Furthermore, if Figure 5-Figure 7 As shown, in order to dissipate heat for the brushless motor drive board 3, the brushless motor drive board 3 includes a MOS tube 32 for starting and stopping the brushless motor 2, and at least part of the projection of the slot 2512 on the horizontal plane coincides with the MOS tube 32. It can be understood that the heat in the brushless motor 2 is dissipated from the slot 2512 by rotating the rotor assembly 23 to drive the airflow around it. When dissipating from the slot 2512, it faces the airflow above the MOS tube 32, allowing the airflow above the MOS tube 32 to move, and then taking away the heat generated near the MOS tube 32. The slot 2512 not only dissipates heat inside the brushless motor 2, but also dissipates heat from the MOS tube 32 by airflow movement. One hole has multiple functions, reduces the setting of other heat dissipation components, simplifies the structure, and greatly improves the heat dissipation efficiency, effectively avoiding excessive local temperature rise in the host housing 1. Secondly, since the MOS tube 32 on the brushless motor driving board 3 generates a lot of heat, dissipating the heat of the MOS tube 32 also achieves the heat dissipation of the brushless motor driving board 3, so that its temperature rise will not be too fast.

[0064] like Figure 7 As shown, the projection of the slot 2512 on the horizontal plane is located in the isolation gap 12. It can be understood that the heat in the inner cavity 27 is dissipated in the isolation gap 12 through the slot 2512, and a longitudinal heat dissipation self-circulation is formed by the inner cavity 27, the isolation gap 12 and the sealed cavity 11 in sequence. Since the slot 2512 is aligned with the isolation gap 12, the heat dissipation in the longitudinal direction is not blocked, so that the heat in the sealed cavity 11 can be quickly and autonomously digested, avoiding excessive temperature rise in the local space, and improving the self-heating ability of the host.

[0065] In one embodiment, Figure 7 As shown, the height of the sealing cavity 11 is H1, the height of the isolation gap 12 is H2, and H1:H2 is 4-15. It should be noted that H2 is the distance between the upper end surface of the plate body 31 and the lower end surface of the lower end plate 251. In this embodiment, the area close to the center of the lower end plate 251 bulges outward, and H2 is the distance between the end surface of the non-convex area of ​​the lower end plate 251 and the upper end surface of the plate body 31. Preferably, H1:H2 is 4.4, H1 is 81mm, and H2 is 18.5mm.

[0066] It can be understood that when H1:H2 is 4-15, it can not only ensure that the components of different heights on the brushless motor drive board 3 have sufficient installation space, but also ensure that the stator assembly 22 and the rotor assembly 23 will not generate electromagnetic interference to the components. At the same time, the height of the host housing 1 is as flat as possible, which is conducive to improving the portability of the food processor. In the small space of the host, heat dissipation space is provided as much as possible to achieve self-circulation heat dissipation, and prevent the local temperature in the host from rising too fast, affecting the service life of parts. When H1:H2 is less than 4, the height of the isolation gap 12 is too large, which will cause the volume of the host housing 1 to be too large, which is not conducive to the miniaturization of the host and greatly reduces the portability. When H1:H2 is greater than 15, the height of the isolation gap 12 is too small, and it may not be able to meet the installation space requirements of the components on the brushless motor drive board 3, and there is also the possibility of electromagnetic interference.

[0067] In one embodiment, Figure 5 , Figure 7 As shown, the brushless motor 2, the brushless motor drive board 3 and the battery 4 are stacked in sequence along the axial direction, and the portable food processor also includes a barrier 5 arranged between the brushless motor drive board 3 and the battery 4, and the barrier 5 is installed and fixed to the main housing 1.

[0068] It is understandable that since the battery 4 needs to be away from the heat source to prevent the battery 4 from overheating and causing safety hazards, and since the brushless motor 2 generates more heat, the battery 4 is placed at the bottom of the sealed cavity 11 to keep the battery 4 away from the brushless motor 2. Secondly, since the brushless motor drive board 3 will also generate a certain amount of heat, it will affect the temperature rise of the battery 4. By setting a barrier 5 between the battery 4 and the brushless motor drive board 3, the brushless motor drive board 3 and the battery 4 are separated, and the battery 4 is insulated and protected, so that the local temperature rise in the host will not be too fast, and the heat is dispersed as much as possible, which is further conducive to the autonomous heat dissipation inside the host. In addition, the host housing 1 is cylindrical, and the brushless motor 2, the brushless motor drive board 3 and the battery 4 are stacked in sequence along the axial direction, which is conducive to reducing the radial size of the host housing 1, and is more conducive to the miniaturization of the host and improving portability.

[0069] Specifically, Figure 6 As shown, the barrier 5 includes a barrier body 51 locked with the brushless motor drive board 3, and a side portion 52 arranged at the edge of the barrier body 51 and located at the periphery of the isolation gap 12, the battery 4 is pressed between the barrier body 51 and the bottom of the main housing 1, and the side portion 52 is fixedly connected to the main housing 1.

[0070] It can be understood that the barrier body 51 is plate-shaped, the brushless motor drive board 3 is fixed to the barrier body 51 by a plurality of screws, the side portion 52 includes a side plate arranged perpendicularly to the barrier body 51, and a first mounting column 521 is provided on the outer surface of the side plate, and a first mounting hole is formed in the first mounting column 521 which runs through from top to bottom. The host housing 1 includes a host upper cover 13 and a base 14, the bottom of the host upper cover 13 has a second mounting column 131 extending downward, the base 14 has a third mounting column 141 extending upward, and the upper end of the third mounting column 141 has a second mounting hole recessed downward. The second mounting column 131 passes through the first mounting hole and extends into the second mounting hole and is locked, so as to realize the fixing of the side portion 52 to the host housing 1, and the side portion 52 and the barrier body 51 are integrally formed, so as to realize the fixing of the host upper cover 13, the barrier 5 and the base 14 in sequence from top to bottom.

[0071] Secondly, after the barrier body 51 and the base 14 are installed, there is a gap, which is used to accommodate the battery 4. The battery 4 is arranged horizontally, and the height of the gap is approximately equal to the height of the battery 4, so that the battery 4 can be pressed between the barrier body 51 and the base 14. The battery 4 can be fixed and installed without setting any screws, thereby realizing screw-free installation of the battery 4, greatly simplifying the structure, and improving the installation efficiency.

[0072] In one embodiment, Figure 5 , Figure 7 As shown, the isolation gap 12 is provided between the brushless motor drive board 3 and the lower end cover 25 , and a wiring terminal 33 electrically connected to the battery 4 is provided on the edge of the brushless motor drive board 3 , and the wiring terminal 33 is located radially outside the isolation gap 12 .

[0073] It can be understood that the brushless motor drive board 3 also includes an extension portion 34 arranged on the edge of the board body 31, and the extension portion 34 extends radially outward, and the extension portion 34 is radially outward of the isolation gap 12. Since the height of the terminal 33 is the largest compared to the height of the components on the board body 31, the terminal 33 is arranged on the extension portion 34, so that the terminal 33 is located outside the isolation gap 12, and is not arranged in the isolation gap 12. Even if the height of the isolation gap 12 is less than the height of the terminal 33, the installation can be completed without interference. The height of the isolation gap 12 can be reduced, and then the height of the host housing 1 can be reduced, which is more conducive to the flattening of the host and improves portability. Secondly, since the volume of the terminal 33 is large, if it is extended into the isolation space, it will occupy more space, which greatly reduces the heat dissipation space in the isolation space. Based on this, the terminal 33 is arranged radially outward of the isolation gap 12, so that there is more space in the isolation gap 12 to dissipate heat.

[0074] Specifically, the axial position of the wiring terminal 33 is as follows: the upper end surface of the wiring terminal 33 is higher than the upper end surface of the brushless motor drive board 3, and the height of the wiring terminal 33 overlaps with at least part of the height of the isolation gap 12. It can be understood that the height of the wiring terminal 33 can be less than the height of the isolation gap 12, and the height of the wiring terminal 33 can also be greater than or equal to the height of the isolation gap 12, so that the height of the isolation gap 12 is set as low as possible while meeting the installation requirements of components on the board body 31, which is more conducive to the flattening of the host and improves portability.

[0075] In one embodiment, the portable food processor further includes a battery 4 electrically connected to the brushless motor 2, the brushless motor 2 and the battery 4 are both installed in the sealed cavity 11, and the single continuous working time of the battery 4 is less than or equal to 600S. It can be understood that the main body shell 1 of the portable food processor is a closed sealed cavity 11. In order to further protect the normal operation of the main body and prevent the temperature inside the main body from rising too fast, the main body works at maximum power, and the single continuous working time of the battery 4 is set to be 600S at most, which is a self-heat dissipation protection for the portable food processor.

[0076] In one embodiment, Figure 1 , Figure 8 As shown, the upper end cover 24 and the lower end cover 25 are respectively provided with openings at the place where the two are closed, and one of the outer side surfaces of the upper end cover 24 and the lower end cover 25 is provided with a mounting portion 242, and the mounting portion 242 is locked with the main housing 1, and one end of the mounting portion 242 close to the opening is flush with the opening.

[0077] It can be understood that, in this embodiment, the mounting portion 242 is arranged on the outer surface of the upper end cover 24, and the mounting portion 242 is locked with the host housing 1 to achieve the fixing of the upper end cover 24 with the host housing 1. Since the upper end cover 24 and the lower end cover 25 are locked and connected up and down, the brushless motor 2 is hoisted in the host housing 1. The bottom of the mounting portion 242 is flush with the opening at the bottom of the upper end cover 24, and the end surface of the upper end cover 24 opening and the bottom end surface of the mounting portion 242 can be processed by positioning only once, which reduces the number of positioning times, thereby greatly improving the processing efficiency.

[0078] In addition to the above preferred embodiments, the technical solutions protected by the present utility model are not limited to the above embodiments. It should be pointed out that the combination of multiple technical solutions in any one embodiment, and the combination of the technical solution of any one embodiment with the technical solutions in one or more other embodiments, are within the protection scope of the present utility model. Although the present utility model has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements can be made to it based on the present utility model. Therefore, these modifications or improvements made without departing from the spirit of the present utility model all belong to the scope of protection claimed by the present utility model.

Claims

1. A brushless motor for a portable food processor, characterized in that: include: A motor housing having an inner cavity; A stator assembly is installed in the inner cavity, comprising a stator bracket and a stator winding wound on the stator bracket; A rotor assembly is disposed in the stator assembly, comprising a rotor core, a magnetic steel embedded in the rotor core, and a rotor shaft passing through and fixed in the rotor core, wherein both sides of the rotor shaft pass through the motor housing; The motor housing has a lower end plate arranged at the bottom of the inner cavity, and a slot hole is formed through the lower end plate. There are multiple slot holes, and the slot holes are distributed in a non-centrally symmetrical manner relative to the axis of the rotor.

2. The brushless motor of the portable food processor according to claim 1, characterized in that: The lower end plate includes a spacing portion arranged between two adjacent slot holes, the spacing portion circumferentially distributes the slot holes, and the slot holes are arranged on one side of a line connecting the geometric center of the slot hole and the axis of the rotor, and the spacing portion is arranged on the other side.

3. The brushless motor of the portable food processor according to claim 1, characterized in that: The inner cavity has an installation space surrounding the outer circumference of the rotor assembly, and the stator assembly is arranged in the installation space. The projection of part of the installation space on the horizontal plane coincides with the slot hole.

4. The brushless motor of the portable food processor according to claim 3, characterized in that: The stator assembly also includes a stator core, the stator bracket is clamped outside the stator core, the stator core includes a plurality of pairs of teeth arranged opposite to each other, and a yoke connecting the teeth, the stator winding is arranged outside the teeth, and the projection of one of the teeth in each pair on a horizontal plane coincides with the slot hole.

5. The brushless motor of a portable food processor according to claim 2, characterized in that: The arc length of the spacer along the circumferential direction is greater than the maximum arc length of the slot along the circumferential direction.

6. The brushless motor of a portable food processor according to claim 4, characterized in that: The axial spacing between the stator winding and the slot hole is 1-3 mm.

7. The brushless motor of a portable food processor according to claim 1, characterized in that: The projection area of ​​the slot on the horizontal plane is S1, the projection area of ​​the lower end plate on the horizontal plane is S2, and S1:S2 is 0.05-0.

25.

8. A portable food processor, characterized in that: A portable food processor comprising a brushless motor, a main body housing and a brushless motor drive board as described in any one of claims 1 to 7, wherein the brushless motor is suspended in the main body housing, and the brushless motor drive board is arranged below the lower end plate of the brushless motor.

9. The portable food processor according to claim 8, characterized in that: The portable food processor also includes a battery electrically connected to the brushless motor. The main housing has a closed sealed cavity. The brushless motor and the battery are both installed in the sealed cavity. The single continuous working time of the battery is less than or equal to 600S.

10. The portable food processor according to claim 8, characterized in that The motor housing includes an upper end cover and a lower end cover which are assembled and matched with each other. The upper end cover and the lower end cover are respectively provided with openings at the place where the two are closed. One of the outer side surfaces of the upper end cover and the lower end cover is provided with a mounting portion, and the mounting portion is locked with the main housing. An end of the mounting portion close to the opening is flush with the opening.

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