CN110620544A

CN110620544A - Food processor and driving device and driving method thereof

Info

Publication number: CN110620544A
Application number: CN201810637144.6A
Authority: CN
Inventors: 徐少承; 王志锋; 冯江平; 梁显堂; 雷俊; 王帅; 刘传兰
Original assignee: Guangdong Midea Consumer Electric Manufacturing Co Ltd
Current assignee: Guangdong Midea Consumer Electric Manufacturing Co Ltd; Guangdong Midea Life Electric Manufacturing Co Ltd
Priority date: 2018-06-20
Filing date: 2018-06-20
Publication date: 2019-12-27

Abstract

The invention discloses a food processor and a driving device and a driving method thereof, wherein the driving device comprises: a power device for controlling the driving motor; the fan is used for cooling the power device; a temperature detector for detecting a temperature of the power device; and the controller is used for controlling the fan to start at a preset duty ratio in the whipping stage and controlling the duty ratio of the fan according to the temperature of the power device. Therefore, the rotating speed of the fan can be controlled according to the temperature of the power device, the heat dissipation effect is improved, meanwhile, the fan is started in the operation of the driving motor, the electric energy is saved, and the energy consumption is reduced.

Description

Food processor and driving device and driving method thereof

Technical Field

The invention relates to the technical field of household appliances, in particular to a driving device of a food processor, the food processor with the driving device and a driving method of the food processor.

Background

The food processor integrates the functions of grinding soybean milk, grinding dry powder, squeezing fruit juice, stirring meat stuffing, shaving ice and the like, is used for manufacturing various foods such as fruit juice, soybean milk, jam, dry powder, shaving ice, meat stuffing and the like, and is a product obtained by diversifying the juice extractor. Generally, a food processor is prepared to be favored by users by controlling a motor to run at a high speed to break cell walls of food so that nutrients of the food can be sufficiently released.

The circuit board of cooking machine mainly includes power supply unit and drive control part, because cooking machine is beating the in-process, has higher to motor speed and moment of torsion requirement, and the frequency is great among the beating process, and each control circuit switches more frequently, causes the power device temperature of control motor higher. If the power device is operated at high temperature for a long time to reach a temperature threshold value, the power device can be easily damaged. Usually, the temperature of the power device is reduced by directly installing a radiating fin or by adopting a fan on-off mode, but the radiating effect of the two modes is not good.

Disclosure of Invention

The present invention is directed to solving at least one of the problems in the art to some extent. Therefore, a first object of the present invention is to provide a driving device of a food processor, which can control the rotation speed of a fan according to the temperature of a power device, so as to improve the heat dissipation effect, and meanwhile, the fan is started during the operation of a driving motor, so as to save electric energy and reduce energy consumption.

The second purpose of the invention is to provide a food processor.

The third purpose of the invention is to provide a driving method of the food processor.

In order to achieve the above object, a first aspect of the present invention provides a driving device for a food processor, the food processor including a processing container, a driving motor, and a food processing member for processing food, a food accommodating cavity for accommodating food is formed in the processing container, the food processing member extends into the food accommodating cavity and is driven by the driving motor to rotate relative to the processing container, the driving device includes: a power device that controls the drive motor; the fan is used for cooling the power device; a temperature detector for detecting a temperature of the power device; and the controller is used for controlling the fan to start at a preset duty ratio in a whipping stage and controlling the duty ratio of the fan according to the temperature of the power device.

According to the driving device of the food processor, in the whipping stage, the controller controls the fan to be started at the preset duty ratio, the temperature of the power device is detected in real time through the temperature detector, and the duty ratio of the fan is controlled according to the temperature of the power device. Therefore, the rotating speed of the fan can be controlled according to the temperature of the power device, the heat dissipation effect is improved, meanwhile, the fan is started in the operation of the driving motor, the electric energy is saved, and the energy consumption is reduced.

In addition, the driving device of the food processor according to the above embodiment of the present invention may further have the following additional technical features:

according to one embodiment of the invention, when the temperature of the power device is less than or equal to a first preset temperature threshold, the controller keeps the preset duty ratio of the fan unchanged; when the temperature of the power device is greater than the first preset temperature threshold and less than or equal to a second preset temperature threshold, the controller controls the fan to operate at a first duty ratio; when the temperature of the power device is greater than the second preset temperature threshold and less than or equal to a third preset temperature threshold, the controller controls the fan to operate at a second duty ratio; and when the temperature of the power device is greater than the third preset temperature threshold value, the controller controls the fan to operate at a third duty ratio.

According to an embodiment of the invention, the first duty cycle is greater than the preset duty cycle, the second duty cycle is greater than the first duty cycle, and the third duty cycle is greater than the second duty cycle.

According to an embodiment of the invention, the preset duty cycle is 20%, the first duty cycle is 50%, the second duty cycle is 80%, and the third duty cycle is 100%.

According to an embodiment of the present invention, when the temperature of the power device is greater than a fourth preset temperature threshold, the controller is further configured to control the driving motor to stop rotating and alarm, where the fourth preset temperature threshold is greater than the third preset temperature threshold.

In order to achieve the above object, a second embodiment of the present invention provides a food processor, including: the cooking container is internally provided with a food containing cavity for containing food; a drive motor; the food processing piece is used for processing food, extends into the food accommodating cavity and rotates relative to the food cooking container under the driving of the driving motor; and a driving device of the food processor of the embodiment of the first aspect of the invention.

According to the food processor provided by the embodiment of the invention, through the driving device of the food processor, the rotating speed of the fan can be controlled according to the temperature of the power device, the heat dissipation effect is improved, and meanwhile, the fan is started in the operation of the driving motor, so that the electric energy is saved, and the energy consumption is reduced.

In addition, the food processor provided in the above embodiment of the present invention may further have the following additional technical features:

according to an embodiment of the present invention, the driving motor includes: the stator core comprises an annular stator yoke portion and a plurality of stator tooth portions, the width of the stator yoke portion is W, the plurality of stator tooth portions are arranged on the inner circumferential surface of the stator yoke portion, a stator tooth slot is formed between every two adjacent stator tooth portions, the plurality of stator tooth portions define a stator hole coaxial with the stator yoke portion, each stator tooth portion comprises a stator tooth portion main body connected with the stator yoke portion and a stator tooth shoe arranged at the inner end of the stator tooth portion main body, the width of each stator tooth portion main body is V, and W: v is 0.6-0.7; and the rotor core is rotatably arranged in the stator hole and is coaxial with the stator hole.

According to another embodiment of the present invention, the driving motor includes: the stator core comprises an annular stator yoke portion and a plurality of stator tooth portions arranged on the inner circumferential surface of the stator yoke portion, a stator tooth slot is formed between every two adjacent stator tooth portions, the plurality of stator tooth portions define a stator hole coaxial with the stator yoke portion, and the maximum radial dimension of the stator yoke portion is D; rotor core, rotor core rotationally establishes in the stator hole and with the stator hole is coaxial, rotor core's maximum radial dimension is D, and wherein, D and D satisfy: D/D is more than or equal to 0.4 and less than or equal to 0.55.

In order to achieve the above object, a third embodiment of the present invention provides a driving method of a food processor, including the following steps: in the whipping stage, controlling the fan to start at a preset duty ratio; and detecting the temperature of the power device, and controlling the duty ratio of the fan according to the temperature of the power device.

According to the driving method of the food processor, in the whipping stage, the fan is controlled to be started at the preset duty ratio, the temperature of the power device is detected in real time, and the duty ratio of the fan is controlled according to the temperature of the power device. Therefore, the rotating speed of the fan can be controlled according to the temperature of the power device, the heat dissipation effect is improved, meanwhile, the fan is started in the operation of the driving motor, the electric energy is saved, and the energy consumption is reduced.

In addition, the driving method of the food processor according to the above embodiment of the present invention may further have the following additional technical features:

according to one embodiment of the invention, when the temperature of the power device is less than or equal to a first preset temperature threshold value, keeping the preset duty ratio of the fan unchanged; when the temperature of the power device is greater than the first preset temperature threshold and less than or equal to a second preset temperature threshold, controlling the fan to operate at a first duty ratio; when the temperature of the power device is greater than the second preset temperature threshold and less than or equal to a third preset temperature threshold, controlling the fan to operate at a second duty ratio; and when the temperature of the power device is greater than the third preset temperature threshold value, controlling the fan to operate at a third duty ratio.

According to one embodiment of the invention, when the temperature of the power device is greater than a fourth preset temperature threshold value, the driving motor is further controlled to stop rotating, and an alarm is given, wherein the fourth preset temperature threshold value is greater than the third preset temperature threshold value.

Drawings

Fig. 1 is a schematic structural diagram of a food processor according to an embodiment of the invention;

fig. 2 is a block diagram of a driving device of a food processor according to an embodiment of the invention;

fig. 3 is a flowchart of a driving method of a food processor according to a specific example of the present invention;

fig. 4 is an assembly view of a stator core and a rotor core of an electric machine according to an embodiment of the present invention;

fig. 5 is a schematic structural view of a rotor core of an electric machine according to an embodiment of the present invention;

fig. 6 is a schematic structural view of a rotor core of a motor according to another embodiment of the present invention; and

fig. 7 is a flowchart of a driving method of a food processor according to an embodiment of the present invention.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

A driving device of a food processor, a food processor having the driving device, and a driving method of the food processor according to embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in fig. 1, the food processor 200 according to the embodiment of the present invention may include: a cooking container 210, a driving motor 100 and a food processing member (not shown in the figure) for processing food. Can be formed with the food that is used for holding food in the cooking container 210 and hold the chamber, food processing spare can stretch into food and hold the intracavity and rotate for cooking container 210 under driving of driving motor 100 to hold the food of intracavity to food and handle.

Further, food processor 200 can also include frame 220, and cooking container 210 can be cup body assembly, and cup body assembly detachably locates frame 220 to in getting and putting food and rinsing cup body assembly. Driving motor 100 can be installed in frame 220, and food processing spare can be the knife tackle spare that links to each other with cup subassembly, and when cup subassembly located frame 220, driving motor 100 can be connected with the knife tackle spare transmission, and from this, driving motor 100 can drive the knife tackle spare and rotate for cup subassembly to make knife tackle spare can cut the processing such as food.

With continued reference to fig. 1, the food processor 200 may further include: an electronic control system 230 and a display assembly 240. Wherein, electrical system 230 includes the circuit board, is provided with the drive plate of food processor 200 on the circuit board, and electrical system 230 can install in frame 220 to the drive plate is connected with driving motor 100 electricity and is in order to control driving motor 100 work. The display assembly 240 may include a display panel and a display device (e.g., a display screen), the display assembly 240 may also be mounted on the base 220, the display assembly 240 may be electrically connected to the electronic control system 230, the display assembly 240 may be used to display the operating state of the food processor 200, and in a further embodiment of the present invention, the display assembly 240 may have an operation key, and a user may control the electronic control system 230 through the operation key to further control the operating mode and state of the food processor 200, so that the use is more convenient. Optionally, the driver board and the display panel may communicate with each other using a serial communication protocol.

Based on the food processor of the above embodiment, the invention provides a driving device of the food processor.

Fig. 2 is a block diagram of a driving device of a food processor according to an embodiment of the invention. As shown in fig. 2, the driving device of the food processor may include: power device 510, fan 520, temperature detector 530, and controller 540.

The power device 510 is used for controlling the driving motor 100, the fan 520 is used for cooling the power device 510, the temperature detector 530 is used for detecting the temperature of the power device 510, and the controller 540 is used for controlling the fan 520 to start at a preset duty ratio in a whipping stage and controlling the duty ratio of the fan 520 according to the temperature of the power device 510. The Controller 540 may be an MCU (Micro-Controller Unit). The preset Duty ratio Duty0 may be set according to practical situations, and may be 20%, for example.

Specifically, after the food processor is powered on to work, a user can select the working mode of the food processor through the display device (human-computer interaction interface) of the display assembly and select a start key so as to enable the food processor to start working. For example, when a user needs to clean the food processor, the cleaning mode can be selected; as another example, when a user desires to whip juice, a juice mode may be selected.

When the food processor enters the whipping stage, the controller 540 outputs a motor control signal to the power device 510, the power device 510 performs driving control on the driving motor 100 according to the motor driving signal, and simultaneously outputs a signal with a Duty ratio Duty of 0 (e.g., Duty is 20%) to the fan 520 to control the fan 520 to start. When the driving motor 100 is operated at a high speed for a long time, the temperature of the power device 510 gradually increases, and therefore, the temperature T of the power device 510 is detected by the temperature detector 530 (e.g., a thermistor) in real time during the operation of the driving motor 100, and a temperature signal is fed back to the controller 540. The controller 540 controls the Duty ratio Duty of the fan 520 according to the temperature T of the power device 510, for example, the higher the temperature T of the power device 510 is, the larger the Duty ratio Duty of the fan 520 is correspondingly controlled, that is, the higher the rotation speed of the fan 520 is correspondingly controlled, so that the system can stably operate for a long time.

It should be noted that, in this embodiment, a heat sink may be further added to further improve the heat dissipation effect of the fan, for example, the power device 510 may be fixed to one side of the heat sink, and the fan 520 may be fixed to the other side of the heat sink.

Therefore, the driving device of the food processor provided by the embodiment of the invention can control the rotating speed of the fan according to the temperature of the power device, so that the heat dissipation effect is improved, and meanwhile, the fan is started in the operation of the driving motor, so that the electric energy is saved, and the energy consumption is reduced.

How to control the duty cycle of the fan 520 according to the temperature T of the power device 510 is further described below with reference to an embodiment of the present invention.

In an embodiment of the present invention, when the temperature T of the power device 510 is less than or equal to the first preset temperature threshold T1, the controller 540 keeps the preset Duty ratio Duty0 of the fan 520 unchanged; when the temperature T of the power device 510 is greater than the first preset temperature threshold T1 and less than or equal to the second preset temperature threshold T2, the controller 540 controls the fan 520 to operate at the first Duty ratio Duty 1; when the temperature T of the power device 510 is greater than the second preset temperature threshold T2 and is less than or equal to the third preset temperature threshold T3, the controller 540 controls the fan 520 to operate at the second Duty ratio Duty 2; when the temperature T of the power device 510 is greater than the third preset temperature threshold T3, the controller 540 controls the fan 520 to operate at the third Duty ratio Duty 3.

The first Duty ratio Duty1 is greater than the preset Duty ratio Duty0, the second Duty ratio Duty2 is greater than the first Duty ratio Duty1, and the third Duty ratio Duty3 is greater than the second Duty ratio Duty 2. The preset Duty ratio 0, the first Duty ratio Duty1, the second Duty ratio Duty2, the third Duty ratio Duty3, the first preset temperature threshold T1, the second preset temperature threshold T2 and the third preset temperature threshold T3 may all be set according to actual conditions, for example, the preset Duty ratio Duty0 may be 20%, the first Duty ratio Duty1 may be 50%, the second Duty ratio Duty2 may be 80%, the third Duty ratio Duty3 may be 100%, the first preset temperature threshold T1 may be 50%, the second preset temperature threshold T2 may be 80%, and the third preset temperature threshold T3 may be 100 ℃.

Specifically, during the whipping stage, the controller 540 first outputs a Duty0 (e.g., 20%) signal to the fan 520 to control the wind 520 to start. When the driving motor 100 runs at a high speed for a long time, the temperature T of the power device 510 gradually rises, and if T is less than or equal to T1 (e.g., T is less than or equal to 50 ℃), the controller 540 controls the Duty ratio Duty of the fan 520 to be Duty 0; if T1 < T ≦ T2 (e.g., 50 ℃ < T ≦ 80 ℃), the controller 540 controls the Duty cycle of the fan 520 to be Duty1 (e.g., Duty 50%); if T2 < T ≦ T3 (e.g., 80 ℃ < T ≦ 100 ℃), the controller 540 controls the Duty cycle of the fan 520 to be Duty2 (e.g., Duty 80%); if T3 < T ≦ T4 (e.g., 80 ℃ < T ≦ 100 ℃), the controller 540 controls the Duty cycle of the fan 520 to be Duty3 (e.g., Duty 100%). That is, the higher the temperature T of the power device 510 is, the higher the Duty ratio Duty of the corresponding control fan 520 is, that is, the higher the rotation speed of the corresponding fan 520 is, so that the system can stably operate for a long time.

Further, in an embodiment of the present invention, when the temperature T of the power device 510 is greater than the fourth preset temperature threshold T4, the controller 540 is further configured to control the driving motor 100 to stop rotating and alarm. Wherein the fourth preset temperature threshold T4 is greater than the third preset temperature threshold T3, for example, the fourth preset temperature threshold T4 may be 120 ℃.

Specifically, in the whipping stage, if T > T4 (e.g., T > 120 ℃), the controller 540 controls the Duty ratio Duty3 (e.g., Duty 100%) of the fan 520 while outputting a motor-off signal to the power device 510 to control the driving motor 100 to stop rotating and to alarm, for example, the controller 540 may control a buzzer to emit an alarm sound, or a display screen of the display assembly to display a system failure, etc., to inform a user.

It should be noted that the driving device of the embodiment of the present invention can also be applied to the occasions where the high-power integrated components have high requirements for heat dissipation.

In order to make the present invention more clearly understood by those skilled in the art, fig. 3 is a flowchart of a driving method of a food processor according to an embodiment of the present invention, and as shown in fig. 3, the driving method of the food processor may include the following steps:

and S101, powering on the system.

And S102, reading the serial port data by the MCU.

And S103, judging whether the beating flag bit flag of the driving motor is 1 or not. If yes, go to step S104; if not, return to step S102.

And S104, controlling the driving motor to start, and simultaneously outputting a signal with a Duty ratio Duty of 20% to control the fan to rotate.

And S105, reading the temperature AD value of the power device by the MCU every 100 ms.

And S106, calculating the current actual temperature T of the power device by the MCU through an internal integration algorithm.

S107, judging whether T is less than or equal to 50 ℃. If yes, go to step S108; if not, step S109 is performed.

S108, the MCU keeps the Duty 20%.

S109, judging whether T is less than or equal to 80 ℃. If yes, go to step S110; if not, step S111 is performed.

And S110, the MCU controls the Duty to be 50%.

S111, judging whether T is less than or equal to 100 ℃. If yes, go to step S112; if not, step S113 is performed.

And S112, the MCU controls the Duty to be 80%.

S113, judging whether T is less than or equal to 120 ℃. If yes, go to step S114; if not, step S115 is performed.

And S114, the MCU controls the Duty to be 100%.

And S115, the MCU controls the Duty to be 100%, and simultaneously outputs a motor turn-off control signal, controls the motor to stop rotating and reports a system fault.

Therefore, according to the driving device of the food processor, in the whipping stage, the controller controls the fan to be started at the preset duty ratio, the temperature of the power device is detected in real time through the temperature detector, and the duty ratio of the fan is controlled according to the temperature of the power device. Therefore, the rotating speed of the fan can be controlled according to the temperature of the power device, the heat dissipation effect is improved, meanwhile, the fan is started in the operation of the driving motor, the electric energy is saved, and the energy consumption is reduced.

Further, referring to fig. 1, 4-6, the driving motor 100 for the food processor 200 according to the embodiment of the present invention may include: stator core 10 and rotor core 20. Wherein, the stator core 10 may include: the stator yoke 11 may be annular, the plurality of stator teeth 12 may be disposed on an inner circumferential surface of the stator yoke 11, and the plurality of stator teeth 12 may define a stator hole 102 coaxial with the stator yoke 11, the stator yoke 11 may provide mechanical support for the plurality of stator teeth 12, so that the stator teeth 12 are fixed in position. A plurality of stator teeth 12 may be spaced apart from each other in a circumferential direction of the stator yoke 11, a stator slot 101 may be formed between two adjacent stator teeth 12, and a winding 14 of the driving motor 100 may be wound around the stator teeth 12 via the stator slot 101.

It should be noted that, in the present invention, the number of the stator teeth 12 can be flexibly set according to the actual situation, the number of the stator teeth 12 in fig. 4 is six for illustrative purposes, and in other embodiments of the present invention, the number of the stator teeth 12 can also be two, four or more, which are within the protection scope of the present invention.

In the related art, the ratio of the width of a magnetic yoke and the width of a tooth of a stator of the driving motor has no fixed value, and the ratio is usually 0.4-0.6, so that the yoke of the stator bears a larger proportion of iron loss to reduce the heating temperature rise of the tooth of the stator, but the problem of overhigh temperature rise of the yoke of the stator is brought. If can solve above-mentioned problem through the shell that overlaps a magnetic conduction on driving motor, can reduce the magnetic flux density of stator yoke portion to a certain extent, reduce the iron loss of stator yoke portion, but can increase material and processing cost.

In the present invention, as shown in fig. 4, each stator tooth 12 may include: a stator tooth body 121 and a stator tooth shoe 122. The stator tooth body 121 is connected to the stator yoke 11, so that the stator teeth 12 and the stator yoke 11 can be integrally connected. The stator tooth shoes 122 are disposed at the inner ends of the stator tooth bodies 121, so that the air gap magnetic resistance between the stator teeth 12 and the rotor core 20 can be reduced, and the magnetic field distribution can be improved.

Further, the width of the stator yoke 11 is W, and the width of each stator tooth body 121 is V. When the maximum radial dimension D of the stator core 10, which is the maximum radial dimension D of the stator core 10, is constant, W: when V is too small, the magnetic flux density of the stator tooth portion 12 is too high, and even the magnetic flux density is saturated, so that the iron loss of the stator tooth portion 12 is large and the temperature rise of the stator tooth portion 12 is too high during the operation of the stator core 10. In addition, the stator tooth slot 101 between two adjacent stator tooth portions 12 is too small, and the distance between two adjacent stator tooth portions 12 is too short, so that an electromagnetic circuit is easily formed, and the energy efficiency of the stator core 10 is reduced. If W: if V is too large, the magnetic flux density of the stator yoke 11 is too high, and even the magnetic flux density is saturated, so that the iron loss of the stator yoke 11 is large and the temperature rise is too high during the operation of the stator core 10.

Thus, in some embodiments of the invention, the width W of the stator yoke 11 and the width V of each stator tooth body 121 may satisfy W: v is 0.6-0.7, and stator yoke portion 11 and stator tooth 12 can distribute the magnetic flux density of stator core 10 more rationally, prevents that stator core 10 local temperature rise is higher, makes the temperature rise of stator core 10 more balanced to improve stator core 10 life and security performance. For example, in some embodiments of the invention, the ratio W of the width W of the stator yoke 11 to the width V of the stator tooth body 121: v may be 0.6, 0.62, 0.65, 0.68, 0.7, etc., respectively.

In the present invention, the width W of the stator yoke 11 may be understood as a distance between the inner circumferential surface and the outer circumferential surface of the annular stator yoke 11, and the width V of the stator tooth body 121 may be understood as a distance between two side surfaces of the stator tooth body 121 in the circumferential direction of the stator yoke 11.

Note that the distance between the inner circumferential surface and the outer circumferential surface of the annular stator yoke portion 11 may be the same in all places, but of course, the distance between the inner circumferential surface and the outer circumferential surface of the annular stator yoke portion 11 may not be the same in all places, and the distance between the inner circumferential surface and the outer circumferential surface of the annular stator yoke portion 11 may not be the same in all places. However, in the present invention, the width W at any position of the stator yoke 11 and the width V at any position of the stator tooth body 121 satisfy W: and V is 0.6-0.7.

The width W of the stator yoke 11 and the width V of the stator tooth body 121 of the stator core 10 for the food processor 200 according to the embodiment of the present invention satisfy W: v is 0.6-0.7, the magnetic flux density distribution is more reasonable, the temperature rise is more balanced, and the service life and the safety are favorably improved. To further make the temperature rise of the stator core 10 lower, according to a further embodiment of the present invention, the width W of the stator yoke 11 and the width V of the stator tooth body 121 may further satisfy: w: and V is 0.64-0.66.

According to some embodiments of the present invention, as shown in fig. 4, the width of the stator yoke 11 may be equal everywhere and the width of each stator tooth body 121 may be equal everywhere, so as to facilitate the mold design of the stator core 10 molding process and the process is simpler.

Further, as shown in fig. 4, the stator yoke 11 may be a circular ring shape with both a circular inner contour and a circular outer contour, and the structure of the stator yoke 11 is simple and convenient to mold.

Further, a bisector of the width of each stator tooth body 121 may pass through the center of the stator bore 102, that is, each stator tooth body 121 extends in a radial direction of the stator bore 102, which facilitates a more symmetrical and uniform magnetic field distribution.

Further, as shown with reference to fig. 4, both ends of the stator tooth shoes 122 may extend beyond the stator tooth sections 121, respectively, in the circumferential direction of the stator yoke 11, and adjacent ends of adjacent two stator tooth shoes 122 are spaced apart or connected. This makes it possible to fix the windings 14 wound around the stator teeth 12, to prevent the windings 14 from coming loose from the inner ends of the stator teeth 12, and to fix the windings 14 more reliably.

The stator core 10 according to an embodiment of the present invention may further include a plurality of positioning protrusions 13, the plurality of positioning protrusions 13 may be provided to the outer circumferential surface of the stator yoke 11 at intervals in the circumferential direction of the stator yoke 11, and each positioning protrusion 13 may extend in the radial direction of the stator yoke 11. Therefore, when the driving motor 100 is assembled, the stator core 10 can be positioned with the bracket of the driving motor 100 through the positioning protrusion 13, so that the driving motor 100 is more simply and conveniently assembled and is accurately positioned.

It should be noted that the number and the arrangement positions of the positioning protrusions 13 are not particularly limited in the present invention, for example, in the specific embodiment shown in fig. 4, the number of the positioning protrusions 13 is equal to the number of the stator teeth 12, and the positioning protrusions 13 are arranged on the outer circumferential surface of the stator yoke 11 in one-to-one correspondence with the positions of the stator teeth 12, so as to facilitate the mold design and the molding of the stator core 10. In some embodiments of the present invention, which are not shown in the drawings, the number and the positions of the positioning protrusions 13 may not correspond to the stator teeth 12 one by one, and only the requirement that the positioning protrusions 13 are spaced apart from each other on the outer circumferential surface of the stator yoke 11 to position the stator core 10 is satisfied.

Further, as shown in fig. 4, rotor core 20 may be disposed within stator bore 102, and rotor core 20 may be coaxial with stator bore 102. Rotor core 20 may rotate around an axis within stator hole 102, and an inner circumferential surface of rotor core 20 with stator hole 102 may be spaced apart by a predetermined distance to allow rotor core 20 to rotate more smoothly.

Therefore, after the current flows through the winding 14 of the driving motor 100, the plurality of stator teeth 12 form a plurality of pairs of magnetic poles, a magnetic field is generated in the stator hole 102, and the rotor core 20 positioned in the stator hole 102 can rotate around the axis under the action of the magnetic field, so that the conversion and the output of the electric energy are realized.

In the related art, the ratio of the rotor diameter to the stator diameter of the driving motor is not fixed, and is usually 0.60-0.75, and in this range, although the driving motor can output a large torque, the high-speed performance of the driving motor is poor, and the cogging torque of the driving motor is increased, and the driving motor is liable to generate vibration and large noise. If the above problem is solved by adding a field weakening effect to the algorithm of the drive control circuit, the energy efficiency of the drive motor may be reduced.

In the invention, the maximum radial dimension D of the stator yoke part 11 and the maximum radial dimension D of the rotor core 20 meet D/D is more than or equal to 0.4 and less than or equal to 0.55. For example, in some embodiments of the present invention, the ratio D/D of the maximum radial dimension D of the stator yoke 11 to the maximum radial dimension D of the rotor core 20 may be 0.45, 0.48, 0.51, 0.54, and the like, respectively.

For a stator core 10 with an equal shape, that is, the maximum radial dimension D of the stator yoke 11 is constant, when D/D is too small (e.g., less than 0.4), the maximum radial dimension D of the rotor core 20 is too small, if the driving motor 100 operates at a low speed, for example, the rotation speed of the driving motor 100 is less than 5000rpm, the load capacity of the rotor core 20 is too small, and under the working condition of driving the same load, the rotor core 20 with the too small maximum radial dimension D may generate heat seriously, which affects the normal operation of the driving motor 100, reduces the efficiency of the driving motor 100, and may even be damaged. When D/D is too large (e.g., greater than 0.55), cogging torque of the driving motor 100 may become large, and inertia moment of the rotor core 20 may become large, and if the driving motor 100 runs at a high speed, for example, when the rotation speed of the driving motor 100 is greater than 10000rpm, the driving motor 100 may vibrate, and thus generate large noise, which affects performance of the driving motor 100 and user experience.

Therefore, in some embodiments of the present invention, the maximum radial dimension D of the stator yoke 11 and the maximum radial dimension D of the rotor core 20 may satisfy D/D of 0.4 ≤ and 0.55, which may improve the output force of the rotor core 20 of the driving motor 100, improve the efficiency of the driving motor 100, prevent the rotor core 20 from generating heat, and be safer, and the maximum radial dimension D of the rotor core 20 may be made small to eliminate inertia generated by the rotor core 20 during high-speed rotation, and prevent the driving motor 100 from generating loud vibration noise.

In addition, it should be noted that, in some embodiments of the present invention, the outer contours of the stator core 10 and the rotor core 20 are circular, and the maximum radial dimension refers to the diameter of the circular outer contours of the stator core 10 and the rotor core 20. While in other embodiments of the present invention, the outer contours of the stator core 10 and the rotor core 20 are not circular, the maximum radial dimension may be understood as the dimension of the position where the radial dimension of the outer contours of the stator core 10 and the rotor core 20 through the axis is the largest.

The maximum radial dimension D of the stator yoke part 11 of the driving motor 100 for the food processor 200 and the maximum radial dimension D of the rotor core 20 according to the embodiment of the invention satisfy D/D is not less than 0.4 and not more than 0.55, so that the problems of small low-speed output force and large high-speed vibration noise of the driving motor 100 are effectively solved, and the efficiency and the safety performance of the driving motor 100 are improved. In order to further improve the low-speed output force of the driving motor 100 and reduce the high-speed noise of the driving motor 100, according to a further embodiment of the present invention, the maximum radial dimension D of the stator yoke 11 and the maximum radial dimension D of the rotor core 20 may further satisfy: D/D is more than or equal to 0.5 and less than or equal to 0.55.

According to some embodiments of the present invention, as shown in fig. 4 to 6, a plurality of magnet slots 23 may be provided in the rotor core 20, the plurality of magnet slots 23 may be provided at intervals in the circumferential direction of the rotor core 20, and both ends of the magnet slots 23 may extend to both axial ends of the rotor core 20, respectively, and the plurality of permanent magnets 25 may be inserted in the plurality of magnet slots 23 in a one-to-one correspondence.

Therefore, the permanent magnets 25 can extend to the two axial ends of the rotor core 20 in the magnet slots 23, the permanent magnets 25 are firmly and reliably fixed, and the permanent magnets 25 can be effectively prevented from loosening. And the plurality of permanent magnets 25 may form a plurality of pairs of magnetic poles to generate a magnetic field, thereby generating an induced electromotive force to realize the conversion of electric energy. The rotor core 20 adopting the permanent magnet 25 does not need to be provided with an excitation coil, so that the weight of the driving motor 100 is favorably reduced, the volume of the driving motor 100 is reduced, the excitation is not needed to be started during starting, and the starting is quicker and more energy-saving.

It should be noted that, the number of the magnet slots 23 and the permanent magnets 25 is not particularly limited, and only the requirement that the plurality of permanent magnets 25 are inserted into the plurality of magnet slots 23 in a one-to-one correspondence manner to fix the permanent magnets 25 and form a plurality of magnetic poles is required to be met. For example, in the specific embodiment shown in fig. 5 and 6, the number of the magnet grooves 23 and the permanent magnets 25 is four, respectively, and the four permanent magnets 25 are inserted in the four magnet grooves 23, respectively. For another example, in other embodiments of the present invention, the number of the magnet slots 23 and the number of the permanent magnets 25 may be two, six, eight or more, respectively, which is within the protection scope of the present invention.

In addition, each magnet groove 23 may be provided with a positioning groove 24 at least one end in the circumferential direction of the rotor core 20, the permanent magnet 25 may be inserted into the positioning groove 24 while being inserted into the magnet groove 23, and the positioning groove 24 may further define the position of the permanent magnet 25, so that the position fixation of the permanent magnet 25 is more accurate and firm.

Further, as shown in fig. 5 and 6, the linear distance of both ends of each magnet groove 23 in the circumferential direction of rotor core 20 is b, the maximum radial distance of the center of rotor core 20 from the outer circumferential surface of rotor core 20 is R, and b and R satisfy b: R ═ 0.95 to 1.0. When the b is less than 0.95, the length of the permanent magnet 25 in the magnet slot 23 is too short, so that the utilization rate of the rotor core 20 is reduced, and the energy efficiency of the driving motor 100 is reduced; when b: R > 1, the leakage flux of rotor core 20 increases, and the energy efficiency of drive motor 100 also decreases. Therefore, in some embodiments of the present invention, when b: R is 0.95-1.0, for example, in some specific embodiments of the present invention, b: R may be 0.95, 0.96, 0.97, 0.98, 0.99, 1.0, and the like, respectively, which effectively ensures energy efficiency of the driving motor 100.

According to some embodiments of the present invention, as shown in fig. 5 and 6, the minimum distance of the magnet slots 23 from the outer circumferential surface of the rotor core 20 is a1, the minimum distance of the stator slots 24 from the outer circumferential surface of the rotor core 20 is a2, and the minimum distance of the permanent magnets 25 from the outer circumferential surface of the rotor core 20 can be understood as a value of the smaller one of a1 and a2, i.e., min (a1, a 2). When min (a1, a2) is too small, the mechanical strength of rotor core 20 is reduced, and the reliability of rotor core 20 is reduced; when min (a1, a2) is too large, magnetic flux leakage of rotor core 20 increases, and energy efficiency of drive motor 100 decreases. Therefore, in some embodiments of the present invention, min (a1, a2) is 0.8mm to 1.8mm, while ensuring mechanical strength and energy efficiency of rotor core 20. For example, in some embodiments of the invention, min (a1, a2) can be 0.8mm, 1.0mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, and the like, respectively.

In addition, the present invention does not specially limit the shape of the magnet slot 23, and only needs to satisfy the requirement that the bisector of the magnet slot 23 in the length direction passes through the center of the rotor core 20, so that the magnetic field distribution generated by the permanent magnet 25 in the magnet slot 23 is more uniform. For example, in the example shown in fig. 5, the magnet grooves 23 are linear grooves having a long bar shape, the linear grooves extend in the chord direction of the rotor core 20, and the distance b between both ends of the linear grooves is the extension length of the linear grooves. In the example shown in fig. 6, the magnet slot 23 is an elongated arc-shaped slot extending in the circumferential direction of the rotor core 20, and the distance b between both ends of the arc-shaped slot is the chord length of the arc-shaped slot.

In some embodiments of the present invention, as shown in fig. 5 and 6, the outer circumferential edge of the rotor core 20 may be formed with a plurality of pole teeth 21, the plurality of pole teeth 21 may be distributed along the circumferential direction of the rotor core 20 and protrude outward, a tooth slot 22 is formed between two adjacent pole teeth 21, and, in an embodiment having a plurality of magnet slots 23, the magnet slots 23 and the pole teeth 21 may be arranged in one-to-one correspondence. At this time, the rotor core 20 is formed as a salient pole structure rotor, which can prevent magnetic flux leakage between rotor poles and cogging, as compared to a full circle-shaped rotor in the related art, thereby improving the efficiency of the rotor core 20.

In the rotor core 20 having the plurality of teeth 21, the maximum outer diameter d of the rotor core 20 is a dimension of a line connecting tooth tips of two teeth 21 whose tooth tips are connected to each other through the axis of the rotor core 20.

Further, as shown in fig. 5 and 6, the normal tooth profile of the pole teeth 21 may be formed in a circular arc shape, the outer circumference of the axial cross section of the rotor core 20 may be formed by sequentially connecting a plurality of circular arc shapes, and the tooth grooves 22 are formed at the junctions of two adjacent circular arc shapes.

As shown in fig. 5 and 6, the radius of a circle that is centered on the center of the rotor core 20 and tangent to the tooth tips of the teeth 21 is R (in this case, R is 0.5d), and the radius of a circle that is tangent to the groove bottom of the tooth slot 22 and centered on the center of the rotor core 20 is R. If R is less than 0.96, the extending length of the pole teeth 21 in the circumferential direction of the rotor core 20 is too short, and the performance of the motor 100 is reduced; if R: R > 0.98, the tooth slots 22 are too small, and noise interference caused by the tooth slots cannot be effectively reduced when the driving motor 100 is operated. Therefore, in some embodiments of the present invention, R: R is 0.96-0.98, for example, in some embodiments of the present invention, R: R may be 0.96, 0.97, 0.98, etc., respectively, which effectively reduces cogging while ensuring efficiency of the driving motor 100.

The driving motor for the food processor can be a variable frequency motor, and the variable frequency motor can provide different rotating speeds, torques, time and the like according to different types of food to be processed by the food processor, so that the food processor with the driving motor is intelligent. In addition, the variable frequency motor does not need structures such as carbon brushes and the like for reversing, so that the carbon brushes are not abraded, the running noise is lower, the service life of the food processor is prolonged, and the use feeling of a user is improved.

Optionally, in the present invention, the food processor may be a wall breaking machine, a juice extractor, a soybean milk maker, or the like. The wall breaking machine has high rotating speed, can be used for processing hard food, and can fully break the wall of a large amount of phytochemicals existing in the fruit peels, fruit cores and rhizomes in the food and release the phytochemicals; the rotating speed of the juice machine is low, and food is processed by a push type extrusion and low-flexibility extraction mode; the juice extractor has higher rotating speed, and can crush and mix more kinds of food; the soybean milk machine has higher rotating speed, and can realize the full automation of the preheating, pulping, soybean milk boiling and delayed boiling processes. The driving motor provided by the embodiment of the invention can be applied to more kinds of food cooking machines, meets more use requirements, and has stronger practicability. In addition, according to the motor stalling prevention control method of the food processor, provided by the embodiment of the invention, the mechanical stalling phenomenon of the motor can be effectively reduced, the beating performance of the food processor is effectively improved, and particularly, the food processor is used in low-speed and high-torque occasions.

Based on the above embodiment, the embodiment of the invention further provides a food processor, which includes the above driving device of the food processor.

It should be noted that, for other specific embodiments of the food processor according to the embodiment of the present invention, reference may be made to fig. 1, fig. 4 to 6 and related descriptions, and details are not repeated herein.

Fig. 7 is a flowchart of a driving method of a food processor according to an embodiment of the present invention. As shown in fig. 7, the driving method of the food processor may include the steps of:

and S1, controlling the fan to start at a preset duty ratio in the whipping stage.

And S2, detecting the temperature of the power device, and controlling the duty ratio of the fan according to the temperature of the power device.

According to one embodiment of the invention, when the temperature of the power device is less than or equal to a first preset temperature threshold value, keeping a preset duty ratio of the fan unchanged; when the temperature of the power device is greater than a first preset temperature threshold and less than or equal to a second preset temperature threshold, controlling the fan to operate at a first duty ratio; when the temperature of the power device is greater than a second preset temperature threshold and less than or equal to a third preset temperature threshold, controlling the fan to operate at a second duty ratio; and when the temperature of the power device is greater than a third preset temperature threshold value, controlling the fan to operate at a third duty ratio.

The first duty ratio is larger than the preset duty ratio, the second duty ratio is larger than the first duty ratio, and the third duty ratio is larger than the second duty ratio. For example, the preset duty cycle is 20%, the first duty cycle is 50%, the second duty cycle is 80%, and the third duty cycle is 100%.

Further, according to an embodiment of the present invention, when the temperature of the power device is greater than a fourth preset temperature threshold, the driving motor is also controlled to stop rotating, and an alarm is given, wherein the fourth preset temperature threshold is greater than the third preset temperature threshold.

It should be noted that details not disclosed in the driving method of the food processor according to the embodiment of the present invention refer to details disclosed in the driving device of the food processor according to the embodiment of the present invention, and detailed descriptions thereof are omitted here.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "below," and "beneath" a second feature can be directly or obliquely under the first feature or can simply mean that the first feature is at a level less than or equal to the second feature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.

Claims

1. The utility model provides a food processor's drive arrangement, a serial communication port, food processor includes cooking container, driving motor and is used for carrying out the food processing piece of handling to food, be formed with the food that is used for holding food in the cooking container and hold the chamber, food processing piece stretches into food holds the intracavity and is in driving motor's drive down for cooking container rotates, drive arrangement includes:

a power device that controls the drive motor;

the fan is used for cooling the power device;

a temperature detector for detecting a temperature of the power device;

and the controller is used for controlling the fan to start at a preset duty ratio in a whipping stage and controlling the duty ratio of the fan according to the temperature of the power device.

2. The driving device of food processor as claimed in claim 1,

when the temperature of the power device is less than or equal to a first preset temperature threshold value, the controller keeps the preset duty ratio of the fan unchanged;

when the temperature of the power device is greater than the first preset temperature threshold and less than or equal to a second preset temperature threshold, the controller controls the fan to operate at a first duty ratio;

when the temperature of the power device is greater than the second preset temperature threshold and less than or equal to a third preset temperature threshold, the controller controls the fan to operate at a second duty ratio;

and when the temperature of the power device is greater than the third preset temperature threshold value, the controller controls the fan to operate at a third duty ratio.

3. The driving device of food processor as claimed in claim 2, wherein the first duty cycle is greater than the preset duty cycle, the second duty cycle is greater than the first duty cycle, and the third duty cycle is greater than the second duty cycle.

4. The driving device of food processor as claimed in claim 2, wherein the preset duty ratio is 20%, the first duty ratio is 50%, the second duty ratio is 80%, and the third duty ratio is 100%.

5. The driving apparatus of food processor as claimed in claim 2, wherein when the temperature of the power device is greater than a fourth preset temperature threshold, the controller is further configured to control the driving motor to stop rotating and alarm, wherein the fourth preset temperature threshold is greater than the third preset temperature threshold.

6. A food processor, comprising:

the cooking container is internally provided with a food containing cavity for containing food;

a drive motor;

the food processing piece is used for processing food, extends into the food accommodating cavity and rotates relative to the food cooking container under the driving of the driving motor; and

a drive device of a food processor according to any one of claims 1 to 5.

7. The food processor of claim 6, wherein the drive motor comprises:

the stator core comprises an annular stator yoke portion and a plurality of stator tooth portions, the width of the stator yoke portion is W, the plurality of stator tooth portions are arranged on the inner circumferential surface of the stator yoke portion, a stator tooth slot is formed between every two adjacent stator tooth portions, the plurality of stator tooth portions define a stator hole coaxial with the stator yoke portion, each stator tooth portion comprises a stator tooth portion main body connected with the stator yoke portion and a stator tooth shoe arranged at the inner end of the stator tooth portion main body, the width of each stator tooth portion main body is V, and W: v is 0.6-0.7;

and the rotor core is rotatably arranged in the stator hole and is coaxial with the stator hole.

8. The food processor of claim 6, wherein the drive motor comprises:

the stator core comprises an annular stator yoke portion and a plurality of stator tooth portions arranged on the inner circumferential surface of the stator yoke portion, a stator tooth slot is formed between every two adjacent stator tooth portions, the plurality of stator tooth portions define a stator hole coaxial with the stator yoke portion, and the maximum radial dimension of the stator yoke portion is D;

rotor core, rotor core rotationally establishes in the stator hole and with the stator hole is coaxial, rotor core's maximum radial dimension is D, and wherein, D and D satisfy: D/D is more than or equal to 0.4 and less than or equal to 0.55.

9. A driving method of a food processor according to any one of claims 6 to 8, comprising the steps of:

in the whipping stage, controlling the fan to start at a preset duty ratio;

and detecting the temperature of the power device, and controlling the duty ratio of the fan according to the temperature of the power device.

10. The driving method of food processor as claimed in claim 9, wherein,

when the temperature of the power device is less than or equal to a first preset temperature threshold value, keeping a preset duty ratio of the fan unchanged;

when the temperature of the power device is greater than the first preset temperature threshold and less than or equal to a second preset temperature threshold, controlling the fan to operate at a first duty ratio;

when the temperature of the power device is greater than the second preset temperature threshold and less than or equal to a third preset temperature threshold, controlling the fan to operate at a second duty ratio;

and when the temperature of the power device is greater than the third preset temperature threshold value, controlling the fan to operate at a third duty ratio.

11. The method of driving a food processor according to claim 10, wherein the first duty ratio is greater than the preset duty ratio, the second duty ratio is greater than the first duty ratio, and the third duty ratio is greater than the second duty ratio.

12. The driving method of the food processor as claimed in claim 10, wherein the preset duty ratio is 20%, the first duty ratio is 50%, the second duty ratio is 80%, and the third duty ratio is 100%.

13. The driving method of food processor as claimed in claim 10, wherein when the temperature of the power device is greater than a fourth preset temperature threshold, the driving motor is further controlled to stop running and alarm, wherein the fourth preset temperature threshold is greater than the third preset temperature threshold.