CN110247370B

CN110247370B - Food processor and overheat protection control method and device of power device of food processor

Info

Publication number: CN110247370B
Application number: CN201810185876.6A
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 Life Electric Manufacturing Co Ltd
Current assignee: Guangdong Midea Life Electric Manufacturing Co Ltd
Priority date: 2018-03-07
Filing date: 2018-03-07
Publication date: 2021-07-20
Anticipated expiration: 2038-03-07
Also published as: CN110247370A

Abstract

The invention discloses a food processor and an over-temperature protection control method and device of a power device of the food processor, wherein the over-temperature protection control method comprises the following steps: acquiring the temperature of a power device in a motor driving module in real time; when the temperature of the power device rises to a first preset temperature, controlling the motor driving module to stop outputting a driving signal to the driving motor, recovering normal output after a control period, and judging whether the temperature of the power device is greater than a second preset temperature; if the temperature of the power device is higher than the second preset temperature, controlling the driving motor to reduce the power to operate by controlling the motor driving module, and judging whether the temperature of the power device is higher than a third preset temperature or not; and if the temperature of the power device is higher than the third preset temperature, controlling the motor driving module to stop the driving motor. Therefore, the food processor can be operated for a long time, and the performance of the food processor is improved.

Description

Food processor and overheat protection control method and device of power device of food processor

Technical Field

The invention relates to the technical field of household appliances, in particular to an over-temperature protection control method for a power device in a food processor, a non-transitory computer readable storage medium, an over-temperature protection control device for the power device in the food processor and the food processor.

Background

With the improvement of living conditions, more and more household appliances enter people's lives, such as a wall breaking machine, a soybean milk machine, a juice extractor, a juicer and the like.

In the related art, the overtemperature protection of the power device by the household appliance mostly adopts a switching-off mode, that is, when the temperature of the power device is detected to reach a threshold value, a signal is directly switched off to stop working. However, this method cannot ensure that the home appliance can be operated for a long time, which degrades the performance of the home appliance.

Disclosure of Invention

The present invention is directed to solving, at least to some extent, one of the technical problems in the art described above.

Therefore, the first objective of the present invention is to provide an over-temperature protection control method for power devices in a food processor, which ensures that the food processor can operate for a long time and improves the performance of the food processor.

A second object of the invention is to propose a non-transitory computer-readable storage medium.

The third purpose of the invention is to provide an over-temperature protection control device for a power device in a food processor.

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

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

In order to achieve the above object, an embodiment of a first aspect of the present invention provides an over-temperature protection control method for a power device in a food processor, where the food processor includes a processing container, a driving motor, a food processing part for processing food, and a motor driving module for controlling the driving motor to operate, a food accommodating cavity for accommodating food is formed in the processing container, the food processing part extends into the food accommodating cavity and is driven by the driving motor to rotate relative to the processing container, and the over-temperature protection control method includes the following steps: acquiring the temperature of a power device in the motor driving module in real time; when the temperature of the power device rises to a first preset temperature, controlling the motor driving module to stop outputting a driving signal to the driving motor, recovering normal output after a control period, and judging whether the temperature of the power device is greater than a second preset temperature, wherein the second preset temperature is greater than the first preset temperature; if the temperature of the power device is higher than a second preset temperature, controlling the driving motor to perform power reduction operation by controlling the motor driving module, and judging whether the temperature of the power device is higher than a third preset temperature, wherein the third preset temperature is higher than the second preset temperature; and if the temperature of the power device is higher than a third preset temperature, controlling the motor driving module to stop the driving motor.

According to the over-temperature protection control method of the power device in the food processor, the temperature of the power device in the motor driving module is firstly obtained in real time, when the temperature of the power device rises to a first preset temperature, the motor driving module is controlled to stop outputting a driving signal to the driving motor, normal output is recovered after a control period, whether the temperature of the power device is larger than a second preset temperature or not is judged, if the temperature of the power device is larger than the second preset temperature, the motor driving module is controlled to control the driving motor to reduce power to operate, whether the temperature of the power device is larger than a third preset temperature or not is judged, and if the temperature of the power device is larger than the third preset temperature, the motor driving module is controlled to stop operating the driving motor. Therefore, the food processor can be operated for a long time, and the performance of the food processor is improved.

In addition, the over-temperature protection control method for the power device in the food processor according to the above embodiment of the present invention may further have the following additional technical features:

in one embodiment of the present invention, controlling the motor driving module to control the driving motor to perform power-down operation includes: acquiring direct-current bus voltage and direct-current bus current of the driving motor; acquiring input power of the driving motor according to the direct-current bus voltage and the direct-current bus current of the driving motor, and acquiring target power according to the input power of the driving motor, wherein the target power is smaller than the input power; and adjusting the driving signal output by the motor driving module according to the target power.

In an embodiment of the present invention, the first preset temperature is 70 degrees celsius, the second preset temperature is 80 degrees celsius, and the third preset temperature is 120 degrees celsius.

In an embodiment of the invention, when the driving motor is controlled to stop running, the food processor is also controlled to send out a stop error message.

In order to achieve the above object, a non-transitory computer readable storage medium is provided according to a second aspect of the present invention, and a computer program is stored on the non-transitory computer readable storage medium, and when the computer program is executed by a processor, the computer program implements the method for controlling over-temperature protection of a power device in a food processor according to the first aspect of the present invention.

According to the non-transitory computer readable storage medium of the embodiment of the invention, the stored computer program is executed, so that the food processor can be ensured to run for a long time, and the performance of the food processor is improved.

In order to achieve the above object, a third embodiment of the present invention provides an over-temperature protection control device for a power device in a food processor, where the food processor includes a processing container, a driving motor, a food processing part for processing food, and a motor driving module for controlling the driving motor to operate, a food accommodating cavity for accommodating food is formed in the processing container, the food processing part extends into the food accommodating cavity and is driven by the driving motor to rotate relative to the processing container, and the over-temperature protection control device includes: the first acquisition module is used for acquiring the temperature of a power device in the motor driving module in real time; the over-temperature protection control module is used for controlling the power device to be in an over-temperature state when the temperature of the power device rises to a first preset temperature, controlling the motor driving module to stop outputting the driving signal to the driving motor and to recover normal output after a control period, and judging whether the temperature of the power device is greater than a second preset temperature, controlling the driving motor to perform power reduction operation by controlling the motor driving module when the temperature of the power device is greater than the second preset temperature, and judging whether the temperature of the power device is greater than a third preset temperature, wherein if the temperature of the power device is greater than a third preset temperature, the driving motor is stopped by controlling the motor driving module, the third preset temperature is higher than the second preset temperature, and the second preset temperature is higher than the first preset temperature.

According to the over-temperature protection control device of the power device in the food processor, the temperature of the power device in the motor driving module is obtained in real time through the first obtaining module, when the temperature of the power device rises to the first preset temperature, the over-temperature protection control module controls the motor driving module to stop outputting a driving signal to the driving motor, normal output is recovered after a control period, whether the temperature of the power device is higher than the second preset temperature or not is judged, the motor driving module is controlled to reduce power to operate the driving motor when the temperature of the power device is higher than the second preset temperature, and whether the temperature of the power device is higher than the third preset temperature or not is judged, wherein if the temperature of the power device is higher than the third preset temperature, the motor driving module is controlled to stop operating the driving motor. Therefore, the food processor can be operated for a long time, and the performance of the food processor is improved.

In addition, the over-temperature protection control device for the power device in the food processor according to the above embodiment of the present invention may further have the following additional technical features:

in an embodiment of the present invention, the over-temperature protection control device for a power device in a food processor further includes: the second acquisition module is used for acquiring direct-current bus voltage and direct-current bus current of the driving motor, acquiring input power of the driving motor according to the direct-current bus voltage and the direct-current bus current of the driving motor, and acquiring target power according to the input power of the driving motor, wherein the target power is smaller than the input power; the over-temperature protection control module is also used for adjusting the driving signal output by the motor driving module according to the target power.

In an embodiment of the invention, the over-temperature protection control module is further configured to control the food processor to send a shutdown error message when the driving motor is controlled to stop running.

In order to achieve the above object, a food processor according to a fourth aspect of the present invention includes: the invention relates to an over-temperature protection control device of a power device in a food processor, which is an embodiment of the third aspect.

According to the food processor provided by the embodiment of the invention, the food processor can be ensured to operate for a long time through the over-temperature protection control device of the power device in the food processor, and the performance of the food processor is improved.

In order to achieve the above object, a food processor according to a fifth aspect of the present invention includes a food processing container, a driving motor, a food processing member for processing food, and a motor driving module for controlling the driving motor, a food accommodating cavity for accommodating food is formed in the food cooking container, the food processing piece extends into the food accommodating cavity and rotates relative to the food cooking container under the drive of the driving motor, the food processor also comprises a memory, a processor and an over-temperature protection control program of the power device in the food processor, wherein the over-temperature protection control program is stored on the memory and can run on the processor, the processor executes the over-temperature protection control program to implement the over-temperature protection control method for the power device in the food processor according to the embodiment of the first aspect of the present invention.

According to the food processor provided by the embodiment of the invention, the processor runs the over-temperature protection control program of the power device in the food processor, so that the food processor can run for a long time, and the performance of the food processor is improved.

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

in one 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.

In one 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.

Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

Drawings

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

fig. 2 is an assembly view of a stator core and a rotor core of a driving motor according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a rotor core of a driving motor according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a rotor core of a driving motor according to another embodiment of the present invention;

fig. 5 is a flowchart of an over-temperature protection control method for a power device in a food processor according to an embodiment of the present invention;

FIG. 6 is a flow diagram of a method for controlling a drive motor to run derated by controlling a motor drive module according to one embodiment of the present invention;

fig. 7 is a block diagram of an over-temperature protection control device of a power device in a food processor according to an embodiment of the invention; and

fig. 8 is a block diagram of an over-temperature protection control device for power devices in a food processor according to another 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.

The following describes an over-temperature protection control method for a power device in a food processor, a non-transitory computer-readable storage medium, an over-temperature protection control device for a power device in a food processor, and a food processor according to an embodiment of the present invention with reference to the drawings.

As shown in fig. 1, the food processor 200 according to the embodiment of the present invention may include: cooking container 210, driving motor 100, a food processing piece (not shown in the figure) that is used for handling food, and the motor drive module (not shown in the figure) of control driving motor 100 operation, can be formed with the food that is used for holding food in cooking container 210 and hold the chamber, food processing piece can stretch into food and hold the intracavity and rotate for cooking container 210 under driving motor 100's drive, and then can 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 assembly, and cup assembly detachably locates frame 220 to in getting and putting food and rinsing cup 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. The electric control system 230 includes an electric control board, a power supply circuit of the food processor 200 and a motor control board are disposed on the electric control board, the electric control board can be mounted on the base 220, and the electric control board is electrically connected to the driving motor 100 to control the driving motor 100 to work. The display component 240 can also be mounted on the base 220, and the display component 240 can be connected to the electronic control system 230, and the display component 240 can be used for displaying the working state of the food processor 200, and in a further embodiment of the present invention, the display component 240 can have an operation key, and a user can control the electronic control system 230 through the operation key, so as to control the working mode and state of the food processor 200, and the like, which is more convenient to use.

Referring to fig. 1 to 4, a driving motor 100 for a food processor 200 according to an embodiment of the present invention may include a stator core 10, wherein the stator core 10 may include: a stator yoke 11 and stator teeth 12.

Specifically, the stator teeth 12 may be plural, the stator yoke 11 may be annular, the plural stator teeth 12 may be provided on an inner circumferential surface of the annular stator yoke 11, and the plural stator teeth 12 may define the stator hole 102 coaxial with the stator yoke 11. The stator yoke 11 may provide mechanical support for the plurality of stator teeth 12, making the stator teeth 12 positionally fixed. 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 the winding 14 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. 2 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 yoke width to the tooth width of the stator of the motor (e.g., the driving motor 100) has no fixed value, and is usually 0.4-0.6 at most, so that the stator yoke portion suffers a larger proportion of iron loss to reduce the heating temperature rise of the stator teeth, but the problem of too high temperature rise of the stator yoke portion is caused. If can solve above-mentioned problem through the shell that overlaps a magnetic conduction on the 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. 2, 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. On the other hand, the windings 14 wound around the stator teeth 12 can be fixed, so that the windings 14 are prevented from being loosened from the inner ends of the stator teeth 12, and the windings 14 are more reliably fixed.

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, and during the operation of the stator core 10, the iron loss of the stator tooth portion 12 is large, and the temperature rise of the stator tooth portion 12 is too high. And 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 (i.e., the driving motor 100) is further reduced.

If W: when V is too large, the magnetic flux density of the stator yoke 11 is too high, even the magnetic flux density is saturated, and during the operation of the stator core 10, the iron loss of the stator yoke 11 is large, and the temperature rise is too high.

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 part 11 and the width V of the stator tooth body 121 of the stator core 10 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. 2, 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. 2, 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. 2, 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. 2, 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.

Referring to fig. 1 to 4, a driving motor 100 for a food processor 200 according to another embodiment of the present invention may include: stator core 10 and rotor core 20.

Specifically, the stator core 10 may include a stator yoke 11 and a plurality of stator teeth 12, wherein the stator yoke 11 is annular, the plurality of stator teeth 12 may be disposed on an inner circumferential surface of the annular stator yoke 11, and 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 of the driving motor 100 may be wound around the stator teeth 12 via the stator slot 101.

Further, the plurality of stator teeth 12 may define a stator hole 102 coaxial with the stator yoke 11, the rotor core 20 may be disposed within the stator hole 102, and the rotor core 20 may be coaxial with the stator hole 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 motor (e.g., the driving motor 100) is not fixed, and is usually 0.60-0.75, and in this range, although the motor can output a large torque, the high-speed performance of the motor is poor, and the cogging torque of the motor is increased, and the 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 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.

Under the condition that the maximum radial dimension D of the stator yoke 11 is fixed, when D/D is less than 0.4, the maximum radial dimension D of the rotor core 20 is too small, if the driving motor 100 runs at a low speed, for example, the rotating 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 can generate heat seriously, which affects the normal running of the driving motor 100, reduces the efficiency of the driving motor 100, and even can be damaged.

When the maximum radial dimension D of the stator yoke 11 is constant, when D/D > 0.55, the cogging torque of the driving motor 100 may be increased, and the rotational inertia of the rotor core 20 may be increased, and if the driving motor 100 runs at a high speed, for example, when the rotation speed of the driving motor 100 > 10000rpm, the driving motor 100 may vibrate, and thus generate a loud noise, which may affect the performance of the driving motor 100 and the user experience.

Therefore, the maximum radial dimension D of the stator yoke portion 11 and the maximum radial dimension D of the rotor core 20 satisfy that D/D is greater than or equal to 0.4 and less than or equal to 0.55, the output force of the rotor core 20 of the driving motor 100 can be improved, the driving motor 100 has higher efficiency, the rotor core 20 is prevented from generating heat, the driving motor is safer, and the maximum radial dimension D of the rotor core 20 can be reduced, so that inertia generated by the rotor core 20 during high-speed rotation is eliminated, and the driving motor 100 is prevented from generating larger 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. 2 to 4, 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 a 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. 3 and 4, 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. 3 and 4, 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. 3 and 4, 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. 3, 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. 4, the magnet slot 23 is an elongated arc-shaped slot extending along 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. 2, the outer contour of the radial cross section of the stator yoke 11 may be substantially circular, the structure of the stator yoke 11 is more stable, and the connection and fixation of the stator yoke 11 and the stator teeth 12 are facilitated.

According to some embodiments of the present invention, as shown in fig. 2, each stator slot 101 may be respectively communicated with the stator hole 102, so that the winding 14 of the stator core 10 is wound from the opening of the stator slot 101 communicated with the stator hole 102, and the winding is convenient and fast.

In some embodiments of the present invention, as shown in fig. 3 and 4, 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. 3 and 4, 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. 3 and 4, 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 drive motor 100 is degraded; 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 100 for the food processor 200 according to the embodiment of the present invention may be a variable frequency motor, and the variable frequency motor may provide different rotation speeds, torques, times, etc. according to different types of food to be processed by the food processor 200, so that the food processor 200 having the driving motor 100 is intelligent. In addition, the inverter motor does not need structures such as carbon brushes and the like for commutation, so that carbon brush abrasion does not exist, the operation noise is lower, the service life of the food processor 200 is prolonged, and the use feeling of a user is improved.

Alternatively, in the present invention, the food processor 200 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 100 according to the embodiment of the invention can be applied to more kinds of food cooking machines 200, so that more use requirements are met, and the practicability is stronger.

It should be noted that the above-mentioned embodiment is only one specific embodiment of the present invention.

Fig. 5 is a flowchart of a method for controlling over-temperature protection of a power device in a food processor according to an embodiment of the present invention.

As shown in fig. 5, the method for controlling over-temperature protection of a power device in a food processor according to an embodiment of the present invention may include the following steps:

and S1, acquiring the temperature of the power device in the motor driving module in real time. The power device can be a driving chip in the motor driving module.

In the embodiment of the invention, the temperature of the power device in the motor driving module can be acquired in real time through the thermistor, wherein the thermistor can be the thermistor of the power device. Specifically, the corresponding relation table between the resistance value of the thermistor and the actual temperature can be stored in advance in the storage space of the food processor, so that in the running process of the food processor, the current resistance value of the actual thermistor can be obtained through acquiring the voltage AD value of the thermistor in real time, calculating according to the sampling circuit, calling the corresponding relation table between the resistance value of the heat storage thermistor in the storage space and the actual temperature, and obtaining the actual temperature of the current power device through inquiring the corresponding relation table.

It should be noted that the storage space described in the above embodiments is not limited to a physical-based storage space, such as a hard disk, and the storage space may also be a storage space (cloud storage space) of a network hard disk connected to a food processor. In addition, the table of the correspondence between the thermistor resistance value and the actual temperature described in the above embodiment may be stored in the storage space of the food processor by the manufacturer of the food processor when the food processor leaves the factory, or may be created by the user according to the power device data manual and stored in the food processor, and is not limited herein.

S2, when the temperature of the power device rises to a first preset temperature, controlling the motor driving module to stop outputting the driving signal to the driving motor, and resuming normal output after a control period, and determining whether the temperature of the power device is greater than a second preset temperature, where the second preset temperature is greater than the first preset temperature, and both the first preset temperature and the second preset temperature can be calibrated according to actual conditions, for example, the first preset temperature may be 70 degrees celsius, and the second preset temperature may be 80 degrees celsius.

Specifically, at the in-process of food processor operation, when the temperature of power device rose to 70 degrees centigrade in the motor drive module who acquires in real time through the thermistor, the steerable motor drive module of food processor stops hall signal of drive signal and opens again to judge whether the temperature of power device is greater than 80 degrees centigrade.

And S3, if the temperature of the power device is higher than the second preset temperature, controlling the driving motor to perform power reduction operation by controlling the motor driving module, and judging whether the temperature of the power device is higher than a third preset temperature, wherein the third preset temperature is higher than the second preset temperature. The third preset temperature may be calibrated according to actual conditions, for example, the third preset temperature may be 120 ℃.

Further, as shown in fig. 6, the above-mentioned controlling the motor driving module to control the driving motor to perform power-down operation may include the following steps:

and S31, acquiring the direct current bus voltage and the direct current bus current of the driving motor.

And S32, acquiring the input power of the driving motor according to the direct current bus voltage and the direct current bus current of the driving motor, and acquiring the target power according to the input power of the driving motor, wherein the target power is smaller than the input power.

And S33, adjusting the driving signal output by the motor driving module according to the target power.

And S4, if the temperature of the power device is higher than the third preset temperature, stopping the operation of the driving motor by controlling the motor driving module.

Specifically, in the running process of the food processor, when the temperature of the power device in the motor driving module obtained in real time by the thermistor is judged to be greater than 80 ℃, the food processor may first detect the dc bus current of the driving motor by the built-in current detection module, detect the dc bus voltage of the driving motor by the voltage detection module, and then obtain the input power of the driving motor according to the obtained dc bus current and the dc bus voltage, for example, calculate by using a power conservation method, where the input power is the dc bus voltage.

Then, the food processor obtains a target power according to the input power of the driving motor, for example, 80% or 70% (not limited herein) of the input power is used as the target power, and adjusts the driving signal output by the motor driving module according to the target power, and determines whether the temperature of the power device in the motor driving module obtained in real time through the thermistor is greater than 120 degrees celsius, and if it is determined whether the temperature of the power device is greater than 120 degrees celsius, the food processor may control the motor driving module to stop the driving motor, so as to avoid damage caused by overheating of the power device. Therefore, the performance of the food processor is improved by finely dividing the temperature of the power device.

In order to improve the use experience of the user, in one embodiment of the invention, when the driving motor is controlled to stop running, the food processor is also controlled to send out the shutdown error reporting information.

Specifically, the food processor can generate a shutdown error message (for example, "the machine body is overheated, the machine body is paused" or "the machine body is overheated, and enters a shutdown cooling state") when controlling the motor driving module to stop the operation of the driving motor, and play the message through the built-in voice module to achieve the purpose of notifying a user.

In summary, according to the over-temperature protection control method for the power device in the food processor of the embodiment of the present invention, the temperature of the power device in the motor driving module is firstly obtained in real time, when the temperature of the power device rises to the first preset temperature, the motor driving module is controlled to stop outputting the driving signal to the driving motor, and the normal output is resumed after a control period, and whether the temperature of the power device is greater than the second preset temperature is determined, if the temperature of the power device is greater than the second preset temperature, the motor driving module is controlled to reduce the power of the driving motor to operate, and whether the temperature of the power device is greater than the third preset temperature is determined, and if the temperature of the power device is greater than the third preset temperature, the motor driving module is controlled to stop operating the driving motor. Therefore, the food processor can be operated for a long time, and the performance of the food processor is improved.

In addition, an embodiment of the present invention further provides a non-transitory computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for controlling over-temperature protection of a power device in a food processor according to the above embodiment of the present invention.

Fig. 7 is a block diagram of an over-temperature protection control device for power devices in a food processor according to an embodiment of the present invention.

As shown in fig. 7, the over-temperature protection control device for a power device in a food processor according to an embodiment of the present invention includes: a first acquisition module 1000 and an over-temperature protection control module 2000.

The first obtaining module 1000 is configured to obtain the temperature of a power device in the motor driving module in real time.

The over-temperature protection control module 2000 is configured to control the motor driving module to stop outputting the driving signal to the driving motor 100 when the temperature of the power device rises to a first preset temperature, and to recover to normal output after a control period, and to judge whether the temperature of the power device is greater than a second preset temperature, and to control the driving motor 100 to perform power reduction operation by controlling the motor driving module when the temperature of the power device is greater than the second preset temperature, and to judge whether the temperature of the power device is greater than a third preset temperature, wherein if the temperature of the power device is greater than the third preset temperature, the driving motor 100 is stopped by controlling the motor driving module, wherein the third preset temperature is greater than the second preset temperature, and the second preset temperature is greater than the first preset temperature.

In an embodiment of the present invention, as shown in fig. 8, the over-temperature protection control apparatus for a power device in a food processor may further include a second obtaining module 3000, where the second obtaining module 3000 is configured to obtain a dc bus voltage and a dc bus current of the driving motor 100, obtain an input power of the driving motor 100 according to the dc bus voltage and the dc bus current of the driving motor 100, and obtain a target power according to the input power of the driving motor 100, where the target power is smaller than the input power, and the over-temperature protection control module is further configured to adjust a driving signal output by the motor driving module according to the target power.

In one embodiment of the present invention, the first predetermined temperature is 70 degrees celsius, the second predetermined temperature is 80 degrees celsius, and the third predetermined temperature is 120 degrees celsius.

In an embodiment of the present invention, the over-temperature protection control module 2000 is further configured to control the food processor 200 to send a shutdown error message when the driving motor 100 is controlled to stop running.

It should be noted that details not disclosed in the over-temperature protection control device for a power device in a food processor according to an embodiment of the present invention refer to details disclosed in the over-temperature protection control method for a power device in a food processor according to an embodiment of the present invention, and are not repeated herein.

In summary, according to the over-temperature protection control device for a power device in a food processor in the embodiment of the present invention, the first obtaining module obtains the temperature of the power device in the motor driving module in real time, and when the temperature of the power device rises to the first preset temperature, the over-temperature protection control module controls the motor driving module to stop outputting the driving signal to the driving motor, and resumes normal output after a control period, and determines whether the temperature of the power device is greater than the second preset temperature, and controls the motor driving module to reduce the power of the driving motor to operate when the temperature of the power device is greater than the second preset temperature, and determines whether the temperature of the power device is greater than the third preset temperature, wherein if the temperature of the power device is greater than the third preset temperature, the motor driving module is controlled to stop operating the driving motor. Therefore, the food processor can be operated for a long time, and the performance of the food processor is improved.

In order to implement the above embodiment, the invention further provides a food processor, which includes an over-temperature protection control device for the power device in the food processor.

In addition, an embodiment of the present invention further provides a food processor, as shown in fig. 1, the food processor 200 includes a processing container 210, a driving motor 100, a food processing component (not shown) for processing food, and a motor driving module (not shown) for controlling the driving motor 100 to operate, a food accommodating cavity for accommodating food is formed in the processing container 210, the food processing component extends into the food accommodating cavity and rotates relative to the processing container under the driving of the driving motor 100, the food processor 200 further includes a memory (not shown), a processor (not shown), and an over-temperature protection control program of a power device in the food processor, which is stored in the memory and can operate on the processor, the processor executes the over-temperature protection control program to realize the over-temperature protection control method of the power device in the food processor.

In one embodiment of the present invention, as shown in fig. 1 to 4, the driving motor 100 includes: a stator core, the stator core including an annular stator yoke 11 and a plurality of stator teeth 12, the width of the stator yoke 11 being W, the plurality of stator teeth 12 being disposed on an inner circumferential surface of the stator yoke 11, a stator slot 101 being formed between two adjacent stator teeth 12, the plurality of stator teeth 12 defining a stator hole 102 coaxial with the stator yoke 11, each stator tooth 12 including a stator tooth body 121 connected to the stator yoke 11 and a stator tooth shoe 122 provided at an inner end of the stator tooth body 121, the width of each stator tooth body 121 being V, wherein W: v is 0.6-0.7; and the rotor core 20 is rotatably arranged in the stator hole 102 and is coaxial with the stator hole 102.

In one embodiment of the present invention, as shown in fig. 1 to 4, the driving motor 100 includes: the stator core 10 comprises an annular stator yoke portion 11 and a plurality of stator tooth portions 12 arranged on the inner circumferential surface of the stator yoke portion 11, a stator tooth slot 101 is formed between every two adjacent stator tooth portions 12, the plurality of stator tooth portions 12 define a stator hole 102 coaxial with the stator yoke portion 11, and the maximum radial dimension of the stator yoke portion 11 is D; rotor core 20, rotor core 20 rotationally establishes in stator hole 102 and coaxial with stator hole 102, and rotor core 20'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.

It should be noted that details not disclosed in the food processor of the embodiment of the present invention refer to details disclosed in the method for controlling the over-temperature protection of the power device in the food processor of the embodiment of the present invention, which are not repeated herein.

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 being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than 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 an excess temperature protection control method of power device among food processor, a serial communication port, food processor includes cooking container, driving motor, is used for carrying out the food processing spare, the control that handle food the motor drive module of driving motor operation, be formed with the food that is used for holding food in the cooking container and hold the chamber, food processing spare stretches into food holds the intracavity and is in driving motor's drive down for the cooking container rotates, excess temperature protection control method includes following step:

acquiring the temperature of a power device in the motor driving module in real time;

when the temperature of the power device rises to a first preset temperature, controlling the motor driving module to stop outputting a driving signal to the driving motor, recovering normal output after a control period, and judging whether the temperature of the power device is greater than a second preset temperature, wherein the second preset temperature is greater than the first preset temperature;

if the temperature of the power device is higher than a second preset temperature, controlling the driving motor to perform power reduction operation by controlling the motor driving module, and judging whether the temperature of the power device is higher than a third preset temperature, wherein the third preset temperature is higher than the second preset temperature;

and if the temperature of the power device is higher than a third preset temperature, controlling the motor driving module to stop the driving motor.

2. The method for controlling the over-temperature protection of the power device in the food processor as claimed in claim 1, wherein controlling the motor driving module to control the driving motor to run with reduced power comprises:

acquiring direct-current bus voltage and direct-current bus current of the driving motor;

acquiring input power of the driving motor according to the direct-current bus voltage and the direct-current bus current of the driving motor, and acquiring target power according to the input power of the driving motor, wherein the target power is smaller than the input power;

and adjusting the driving signal output by the motor driving module according to the target power.

3. The method for protecting and controlling the power device in the food processor from the over-temperature according to claim 1 or 2, wherein the first preset temperature is 70 degrees centigrade, the second preset temperature is 80 degrees centigrade, and the third preset temperature is 120 degrees centigrade.

4. The method for controlling the over-temperature protection of the power device in the food processor as claimed in claim 1, wherein the method further controls the food processor to send out a shutdown error message when controlling the driving motor to stop running.

5. A non-transitory computer-readable storage medium having stored thereon a computer program, wherein the program, when executed by a processor, implements the method for controlling over-temperature protection of a power device in a food processor according to any one of claims 1 to 4.

6. The utility model provides a power device's excess temperature protection controlling means among food processor, a serial communication port, food processor includes cooking container, driving motor, is used for carrying out the food processing spare, the control that handle food the motor drive module of driving motor operation, be formed with the food that is used for holding food in the cooking container and hold the chamber, food processing spare stretches into food holds the intracavity and is in driving motor's drive down for the cooking container rotates, excess temperature protection controlling means includes:

the first acquisition module is used for acquiring the temperature of a power device in the motor driving module in real time;

an over-temperature protection control module, configured to control the motor driving module to stop outputting the driving signal to the driving motor when the temperature of the power device rises to a first preset temperature, and to recover to normal output after a control period, and to determine whether the temperature of the power device is greater than a second preset temperature, and to control the driving motor to perform power-down operation by controlling the motor driving module when the temperature of the power device is greater than the second preset temperature, and to determine whether the temperature of the power device is greater than a third preset temperature, where,

if the temperature of the power device is higher than a third preset temperature, the motor driving module is controlled to enable the driving motor to stop running, wherein the third preset temperature is higher than the second preset temperature, and the second preset temperature is higher than the first preset temperature.

7. The over-temperature protection control device for power devices in food processor as claimed in claim 6, further comprising:

the second acquisition module is used for acquiring direct-current bus voltage and direct-current bus current of the driving motor, acquiring input power of the driving motor according to the direct-current bus voltage and the direct-current bus current of the driving motor, and acquiring target power according to the input power of the driving motor, wherein the target power is smaller than the input power;

the over-temperature protection control module is also used for adjusting the driving signal output by the motor driving module according to the target power.

8. The over-temperature protection control device for power devices in food processor as claimed in claim 6 or 7, wherein the first preset temperature is 70 degrees centigrade, the second preset temperature is 80 degrees centigrade, and the third preset temperature is 120 degrees centigrade.

9. The over-temperature protection control device for power devices in food processor as claimed in claim 6, wherein the over-temperature protection control module is further configured to control the food processor to send out a shutdown error message when controlling the driving motor to stop running.

10. A food processor characterized by comprising the over-temperature protection control device of the power device in the food processor as claimed in any one of claims 6 to 9.

11. The utility model provides a food processor, its characterized in that, food processor includes cooking container, driving motor, is used for carrying out the food processing spare, the control of handling to food the motor drive module of driving motor operation, be formed with the food that is used for holding food in the cooking container and hold the chamber, food processing spare stretches into food holds the intracavity and is in driving motor drive down for cooking container rotates, food processor still includes memory, treater and store on the memory and can be in the food processor of operation on the treater in the overheat protection control program of power device, wherein, overheat protection control program realizes the overheat protection control method of power device in the food processor according to any one of claims 1-4 when being executed by the treater.

12. The food processor of claim 11, 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.

13. The food processor of claim 11, 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.