CN111657762A - Food processing machine and control method thereof - Google Patents
Food processing machine and control method thereof Download PDFInfo
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- CN111657762A CN111657762A CN201910171196.3A CN201910171196A CN111657762A CN 111657762 A CN111657762 A CN 111657762A CN 201910171196 A CN201910171196 A CN 201910171196A CN 111657762 A CN111657762 A CN 111657762A
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- 235000013305 food Nutrition 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000003756 stirring Methods 0.000 claims abstract description 59
- 230000001681 protective effect Effects 0.000 claims abstract description 8
- 238000001514 detection method Methods 0.000 claims description 56
- 239000000463 material Substances 0.000 claims description 18
- 238000004804 winding Methods 0.000 claims description 14
- 230000002159 abnormal effect Effects 0.000 claims description 11
- 238000002360 preparation method Methods 0.000 claims description 8
- 230000000694 effects Effects 0.000 abstract description 9
- 230000001276 controlling effect Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 7
- 238000002156 mixing Methods 0.000 description 6
- 230000009246 food effect Effects 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000006386 neutralization reaction Methods 0.000 description 3
- 230000010349 pulsation Effects 0.000 description 3
- 238000010298 pulverizing process Methods 0.000 description 3
- 238000010411 cooking Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
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Classifications
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
- A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
- A47J43/07—Parts or details, e.g. mixing tools, whipping tools
- A47J43/08—Driving mechanisms
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- A—HUMAN NECESSITIES
- A47—FURNITURE; DOMESTIC ARTICLES OR APPLIANCES; COFFEE MILLS; SPICE MILLS; SUCTION CLEANERS IN GENERAL
- A47J—KITCHEN EQUIPMENT; COFFEE MILLS; SPICE MILLS; APPARATUS FOR MAKING BEVERAGES
- A47J43/00—Implements for preparing or holding food, not provided for in other groups of this subclass
- A47J43/04—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven
- A47J43/046—Machines for domestic use not covered elsewhere, e.g. for grinding, mixing, stirring, kneading, emulsifying, whipping or beating foodstuffs, e.g. power-driven with tools driven from the bottom side
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/24—Arrangements for stopping
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Food Science & Technology (AREA)
- Power Engineering (AREA)
- Food-Manufacturing Devices (AREA)
Abstract
The invention discloses a food processor and a control method thereof, wherein the food processor comprises a base, a brushless motor module arranged in the base, a control unit for controlling the brushless motor module, and a stirring cup arranged on the base, wherein the stirring cup comprises a cup body and a cup cover arranged on the cup body, and the control method comprises the following steps: the control unit acquires a brake protection signal and sends a brake instruction according to the brake protection signal; and the brushless motor module executes protective brake shutdown according to the brake command. The brushless motor can stop rotating fast, namely the effect of fast braking of the food processor is achieved, and the use safety of a user is improved.
Description
Technical Field
The invention relates to the technical field of household appliances, in particular to a food processing machine and a control method thereof.
Background
The food processor is a household appliance product with high selection rate of modern home health care and health preservation. The existing food processing machine mostly adopts a single-phase series motor to drive a crushing cutter component to stir food materials so as to realize the preparation of foods such as soybean milk, rice paste and the like.
However, because the rotor of the single-phase series excited motor always maintains a constant steering direction, a controllable phase-shifting voltage regulation is usually adopted for regulating the rotating speed of the single-phase series excited motor, and the triggering voltage of the thyristor lags behind the input voltage to realize the phase-shifting triggering of the input voltage so as to regulate the triggering voltage, thereby regulating the rotating speed of the single-phase series excited motor.
Disclosure of Invention
The invention aims to solve at least one of the technical problems in the prior art to a certain extent, and provides a food processor and a control method thereof.
In order to achieve the above object, the present invention provides a control method for a food processor, the food processor includes a base, a brushless motor module disposed in the base, a control unit for controlling the brushless motor module, and a mixing cup disposed on the base, the mixing cup includes a cup body and a cup cover mounted on the cup body, the control method includes:
the control unit acquires a brake protection signal and sends a brake instruction according to the brake protection signal;
and the brushless motor module executes protective brake shutdown according to the brake command.
Preferably, the control unit obtains a brake protection signal, and sends a brake instruction according to the brake protection signal includes: the control unit acquires the working state of the food processor, and when the working state is an abnormal working state, the control unit sends a braking instruction.
Preferably, the control unit acquiring the operating state of the food processor comprises: the control unit acquires one or more combinations of the opening state of the cup cover of the stirring cup, the power-on state of the food processor and the current value at the brushless motor module; the opening state comprises an opening state and a closing state, and the opening state is an abnormal state; the power-on state comprises a power-on state and a power-off state, and the power-off state is an abnormal state; and the current value is in an abnormal state when being larger than a preset current value.
Preferably, the control unit obtains a brake protection signal, and sends a brake instruction according to the brake protection signal includes: the control unit obtains the stage of the working state of the food processor, and when the brushless motor module intermittently stirs, crushes and intermittently stops rotating the material or stirs the material, the control unit sends a braking instruction.
Preferably, the control unit obtains a brake protection signal, and sends a brake instruction according to the brake protection signal includes: the control unit acquires the rotating speed of a brushless motor in the brushless motor module, and when the rotating speed of the brushless motor is not greater than a preset value T1, the brushless motor is controlled by square waves; and when the rotating speed of the brushless motor is greater than a preset value T1, controlling the brushless motor by adopting a sine wave.
Preferably, the brushless motor module executing the protective brake shutdown according to the brake command includes: and the brushless motor module sets three lower arm switches of the brushless motor in the brushless motor module to be low level according to the braking instruction, so that the three-phase stator winding of the brushless motor module is in short circuit, and the brushless motor module is braked and stopped.
The invention provides a food processing machine which comprises a brushless motor module used for stirring and crushing materials, a control unit used for controlling the brushless motor module, and a brake protection module.
Preferably, the brake protection module includes at least one of a cover opening detection module, a zero-crossing detection module and a current detection module, the cover opening detection module is configured to detect a cover opening signal, the zero-crossing detection module is configured to detect a pulse signal and obtain a power-on state of the food processor according to the pulse signal, and the current detection module is configured to obtain a current value at the brushless motor module.
Preferably, the brushless motor module includes three upper arm switches and three lower arm switches, and the brushless motor module sets the three lower arm switches to a low level according to the braking instruction to short-circuit the three-phase stator winding of the brushless motor module, so that the brushless motor module is braked and stopped.
Preferably, the food processor further comprises a hall detection module, and the control unit obtains the rotating speed of the brushless motor in the brushless motor module through the hall detection module and controls the brushless motor according to the rotating speed of the brushless motor.
The above technical scheme of this application has following beneficial effect:
1. the invention provides a control method of a food processor, the food processor comprises a brushless motor module for stirring and crushing materials and a control unit for controlling the brushless motor module, the brushless motor module comprises an intelligent power module, a brushless motor and a motor bracket, and the intelligent power module comprises a power switch device and a drive circuit. When the food processor needs to be rapidly stopped due to sudden power failure of the food processor or the use safety of the food processor caused by reasons such as power supply line obstruction and the like in a normal working state of the food processor, the control unit detects and acquires a brake protection signal needing the rapid stop of the food processor, analyzes the brake protection signal, and controls the corresponding pin to output a brake instruction to the intelligent power module of the brushless motor module when the rapid brake is needed. Brake instruction drive intelligent power module makes brushless motor's three-phase stator winding whole by the short circuit, thereby realize being in the electricity generation state with brushless motor, because brushless motor winding's resistance is less, so the return circuit produces great electric current, brushless motor's kinetic energy can be released fast, thereby make brushless motor instantaneously produce very big brake torque, can reach brushless motor fast stalling, reach the effect of food preparation machine fast brake promptly, can solve current broken wall cooking machine and can't realize the fast braking function.
2. In the operation of the food processor, the working state of the food processor comprises a normal working state and an abnormal working state, and the working state of the food processor comprises the following steps: the control unit acquires one or more combinations of the opening state of the cup cover of the stirring cup, the power-on state of the food processor and the current value at the brushless motor module. The stirring cup cover is in an open state due to the situations that the stirring cup cover is not installed in place or is opened by mistake and the like. The control unit in the embodiment of the application detects the opening state of the cup cover of the stirring cup in the working process of the food processor through the cover opening detection module and executes corresponding operation according to the opening state. The opening state comprises an opening state and a closing state, when the control unit detects that the cup cover of the stirring cup is in the closing state, the control unit executes a working program for processing materials according to the original definition of the food processor, when the control unit detects that the cup cover of the stirring cup is in the opening state, the situation that the cup cover and the cup body of the stirring cup are not installed in place possibly occurs in the work of the food processor, and the situation that the cup cover and the cup body of the stirring cup are not installed in place possibly affects the safety of a user because a motor in the food processor drives the crushing cutter assembly to rotate at a high speed. In the embodiment, when the control unit detects that the cup cover of the stirring cup is in an open state, the control unit sends a braking instruction to the intelligent power module of the brushless motor module, so that the brushless motor is stopped rapidly, namely, the effect of rapid braking of the food processor is achieved.
The food processor obtains the power-on state of the food processor through the zero-crossing detection module, the zero-crossing detection module comprises an input end and an output end, the input end and the output end are isolated through an optical coupler, the input end of the zero-crossing detection module is provided with a one-way rectifier diode D1 and an optical coupler light-emitting diode U1, and the output end of the zero-crossing detection module is provided with a phototriode for receiving a signal sent by a light-emitting diode U. During the work of the food processor, when the commercial power is in a positive half period, the optocoupler light-emitting diode U1 is conducted, the phototriode receives a signal sent by the light-emitting diode U1, the phototriode is conducted, and the output end of the zero-crossing detection module outputs a low level to the control unit; when the commercial power is in a negative half period, the optocoupler light-emitting diode U1 is cut off, namely the light-emitting diode U1 is not conducted, the phototriode cannot receive the signal sent by the light-emitting diode U1, the phototriode is cut off, the output end of the zero-crossing detection module outputs a high level to the control unit, and therefore the output end of the zero-crossing detection module outputs a pulse signal. The control unit judges whether the food processor is normally powered on or not by detecting the existence of the pulse signal, namely, when the control unit can normally detect the pulse signal, the power-on state of the food processor is considered to be in a conducting state, and when the control unit does not detect the pulse signal within a certain time period, the power-on state of the food processor is considered to be in a disconnecting state. When the control unit detects that the power-on state of the food processor is a conduction state, the control unit executes a working program for processing the material according to the original specification of the food processor; when the control unit detects that the power-on state of the food processor is in the off state, the situation that the food processor cannot normally work due to the power failure of a power grid, the sudden lifting of a cup body or the fault of the machine and the like during the work of the food processor is described. When the control unit detects that the power-on state is the off state, the control unit sends a braking instruction to the intelligent power module of the brushless motor module, so that the brushless motor stops rapidly, and the effect of rapid braking of the food processor is achieved.
When the food processor is operating normally, the food processor is operating empty and loaded. The no-load and the load belong to the normal working state of the brushless motor, so that the working current of the brushless motor is in a certain range, namely in a set range under the no-load or the load. However, when the brushless motor is locked, the working current value of the brushless motor deviates from the range of the preset current value, so that it can be detected whether the brushless motor of the food processor is in a normal working state by detecting the current value at the brushless motor module, therefore, the food processor of this embodiment is provided with the current detection module, the control unit can obtain the current value at the brushless motor module through the current detection module, and after obtaining the current value at the brushless motor module through the current detection module, the control unit compares the current value with the preset current value a1, and determines whether to send a braking instruction according to the comparison result. In the embodiment, 15A is not less than A1 is not less than 25A, when A1 is in the range, the control unit executes the working procedure of the food processor for processing the materials according to the original specification under the normal working state, and A1 is preferably 20A; when the current value at the brushless motor module is larger than the preset current value A1, indicating that the brushless motor is locked or close, the control unit sends a braking instruction to the intelligent power module of the brushless motor module, so that the brushless motor is stopped rapidly, and the effect of rapid braking of the food processor is achieved.
3. In the food processing machine stirring and crushing food materials, the working state of the brushless motor module is in a stage comprising a rotation starting stage, a normal rotation neutralization rotation stirring and crushing intermittent stop or a rotation stirring completion stage. When the user uses the food processor, the user may check the processing stage of the food processor through a mode of opening a cover or the like when the stirring, crushing, intermittent stopping or rotating and stirring is completed, and the brushless motor of the brushless motor module is controlled by acquiring the stage of the working state of the brushless motor module in consideration of the use safety of the user. In this embodiment, the brushless motor stops rotating by using the brake in the process from the normal rotation to the stop of the rotation, so that the brushless motor can stop rotating quickly. In this embodiment, when it is detected that the brushless motor is in the stirring and pulverizing intermittent stop stage or the rotating and stirring completion stage, the control unit sends a braking instruction to the intelligent power module of the brushless motor module, so that the brushless motor is stopped rapidly, that is, the rapid braking effect of the food processor is achieved.
4. When the food processor is started, large torque is needed to provide large power for starting, so the square wave control brushless motor is adopted for starting in the embodiment, the power density of the square wave control brushless motor is 15.4% higher than that of sine starting when the motor is started, and the starting torque is also large, so that the requirement that the starting torque is large for wall breaking is just met. The food processor can adopt the Hall detection module to detect the real-time rotating speed of the brushless motor, when the rotating speed of the brushless motor is greater than a preset value T1, the value range of T1 is 1000 rpm-5000 rpm, in the embodiment, T1=3000rpm, which indicates that the brushless motor of the food processor operates basically stably without needing larger torque, at the moment, the sine wave is adopted to control the brushless motor, a certain switching process is performed from square wave control to sine wave control, compared with square wave control, the sine wave has smaller pulsation to the control torque of the brushless motor, and the noise and vibration are smaller when the whole machine operates.
5. The food processor comprises a base and a stirring cup arranged on the base, the stirring cup comprises a cup body and a cup cover arranged on the cup body, the food processor also comprises a brushless motor module arranged in the base and used for stirring and crushing materials and a control unit for controlling the brushless motor module, the food processor also comprises a brake protection module, when the brushless motor module is in a working state, the brake protection module acquires a brake protection signal and sends the brake protection signal to the control unit, the control unit sends a brake instruction to the brushless motor module according to the brake protection signal so as to enable the brushless motor module to execute protective braking and stopping, the brushless motor module comprises an intelligent power module, a brushless motor and a motor support, the intelligent power module comprises a power switch device and a driving circuit, and under the normal working state of the food processor, the food processor is suddenly powered off or used for the food processor due to reasons such as power supply line obstacles, when the food processor needs to be quickly stopped, the control unit detects and acquires a brake protection signal which needs the food processor to be quickly stopped, analyzes the brake protection signal, and controls the corresponding pin to output a brake instruction to the intelligent power module of the brushless motor module when the food processor needs to be quickly stopped.
The brushless motor module comprises three upper arm switches and three lower arm switches, wherein the PWM _ UH, the PWM _ VH, the PWM _ WH, the PWM _ UL, the PWM _ VL and the PWM _ WL are six paths of PWM wave signals, the PWM _ UH, the PWM _ VH and the PWM _ WH are used for controlling the IPM three paths of IGBT upper arm switches, and the PWM _ UL, the PWM _ VL and the PWM _ WL are used for controlling the IPM three paths of IGBT lower arm switches. And the brushless motor module sets the three lower arm switches to be at a low level according to the braking instruction to enable the three-phase stator winding of the brushless motor module to be in short circuit, so that the brushless motor module is braked and stopped. Brake instruction drive intelligent power module makes brushless motor's three-phase stator winding all by the short circuit to the realization is in the power generation state with brushless motor, because brushless motor winding's resistance is less, so the return circuit produces great electric current, brushless motor's kinetic energy can be released fast, thereby makes brushless motor instantaneously produce very big braking torque, can reach brushless motor fast stalling, reaches the effect of food preparation machine fast brake promptly.
Drawings
The invention is described in further detail below with reference to the accompanying drawings:
FIG. 1 is a flow chart illustrating a method for controlling a food processor according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of the hall detection module according to the first embodiment of the present invention;
fig. 3 is a schematic diagram of a starting process of the brushless motor according to the first embodiment of the present invention;
FIG. 4 is a schematic diagram illustrating switching from square wave control to sine wave control of the brushless motor according to one embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating sine wave control of a brushless motor according to one embodiment of the present invention;
FIG. 6 is a flow chart of a control method of a food processor according to a second embodiment of the present invention;
FIG. 7 is a flow chart of a control method of a food processor according to a third embodiment of the present invention;
fig. 8 is a schematic structural diagram of a zero-crossing detection module according to a third embodiment of the present invention;
FIG. 9 is a flow chart of a control method of a food processor according to a fourth embodiment of the present invention;
FIG. 10 is a flow chart of a control method of a food processor according to a fifth embodiment of the present invention;
FIG. 11 is a schematic view of a food processor according to a sixth embodiment of the present invention;
fig. 12 is a schematic structural diagram of a motor driving module according to a sixth embodiment of the present invention;
fig. 13 is a schematic diagram of connection of the three-way upper arm switch, the three-way lower arm switch and the brushless motor according to the sixth embodiment of the present invention.
The corresponding reference numbers for the component names in the figures are as follows:
1. a machine base; 2. A stirring cup; 21. a cup body; 22. a cup cover; 3. a brushless motor module; 31. a brushless motor; 32. a motor bracket; 4. a control unit.
Detailed Description
The invention is described in further detail below with reference to the following figures and embodiments:
the first embodiment is as follows:
referring to fig. 1 to 5, a control method of a food processor according to an embodiment of the present invention includes a brushless motor module for stirring and crushing a material, a control unit for controlling the brushless motor module, and a hall detection module, and the control method of the food processor includes the following steps:
step S101: the control unit acquires the rotating speed of a brushless motor in the brushless motor module, and when the rotating speed of the brushless motor is not greater than a preset value T1, the brushless motor is controlled by square waves; and when the rotating speed of the brushless motor is greater than a preset value T1, controlling the brushless motor by adopting a sine wave.
As shown in fig. 3 to 5, when the food processor is started, a large torque is required to provide a large power for starting, so that the square wave control brushless motor is adopted for starting in the embodiment, the power density of the square wave control brushless motor used for starting the motor is 15.4% higher than that of the sine starting, and the starting torque is also large, which just meets the requirement of large starting torque required for breaking the wall. The food processor can detect the real-time rotating speed of the brushless motor by adopting the Hall detection module, when the rotating speed of the brushless motor is greater than a preset value T1, the value range of T1 is 1000 rpm-5000 rpm, in the embodiment, T1=3000rpm, which indicates that the brushless motor of the food processor is basically stable in operation and does not need larger torque, at the moment, the sine wave is adopted to control the brushless motor, a certain switching process is performed from square wave control to sine wave control, the switching process is shown in figure 4, compared with square wave control, the sine wave has smaller torque pulsation to control the brushless motor, the noise and vibration are smaller when the whole machine operates, and the sine wave controls the brushless motor is shown in figure 5.
Step S102: the control unit acquires a brake protection signal and sends a brake instruction according to the brake protection signal.
In this embodiment, the brushless motor module includes an intelligent power module, a brushless motor, and a motor support, and the intelligent power module includes a power switch device and a driving circuit. When the food processor needs to be rapidly stopped due to sudden power failure of the food processor caused by reasons such as power supply line obstruction or the use safety of the food processor under the normal working state of the food processor, the control unit detects and acquires a brake protection signal which needs the rapid stop of the food processor, analyzes the brake protection signal and comprises an abnormal working state signal of the food processor, and controls the corresponding pin to output a brake instruction to the intelligent power module of the brushless motor module when the rapid brake is needed.
Step S103: and the brushless motor module executes protective brake shutdown according to the brake command.
Brake instruction drive intelligent power module makes brushless motor 'S three-phase stator winding whole by the short circuit, thereby realize being in the electricity generation state with brushless motor, because brushless motor winding' S resistance is less, so the return circuit produces great electric current, brushless motor 'S kinetic energy can be released fast, thereby make brushless motor instantaneously produce very big brake torque, can reach brushless motor fast stalling, can realize stopping within 0.5S under food preparation machine normal work, reach the effect of food preparation machine fast brake promptly, can solve current broken wall cooking machine and can't realize the fast braking function.
Example two:
in this embodiment, the brake protection module includes an uncovering detection module, and the food processor detects the open state of the cup cover of the stirring cup through the uncovering detection module, wherein the open state of the cup cover of the stirring cup includes an open state and a closed state. As shown in fig. 6, the control method of the food processor comprises the following steps:
step S201: the control unit detects the opening state of the cup cover of the stirring cup, and the opening state comprises an opening state and a closing state.
During the operation of the food processor, the cup cover of the mixing cup may be opened due to the situations of improper installation or manual mistaken opening. The control unit in the embodiment of the application detects the opening state of the cup cover of the stirring cup in the working process of the food processor through the cover opening detection module and executes corresponding operation according to the opening state. The opening state comprises an opening state and a closing state, and when the control unit detects that the cup cover of the stirring cup is in the closing state, the control unit executes the working program of processing the materials according to the original definition of the food processor.
Step S202: when the cup cover is in an open state, the control unit sends a braking instruction.
When the control unit detects that the cup cover of the stirring cup is in an open state, the situation that the cup cover and the cup body of the stirring cup are not installed in place possibly occurs in the working process of the food processor, and the motor in the food processor drives the crushing cutter assembly to rotate at a high speed, so that the situation that the cup cover and the cup body of the stirring cup are not installed in place possibly affects the safety of a user. In the embodiment, when the control unit detects that the cup cover of the stirring cup is in an open state, the control unit sends a braking instruction to the intelligent power module of the brushless motor module, so that the brushless motor is stopped rapidly, namely, the effect of rapid braking of the food processor is achieved.
Example three:
in this embodiment, the brake protection module includes a zero-crossing detection module, the food processor obtains a power-on state of the food processor through the zero-crossing detection module, where the power-on state includes a power-on state and a power-off state, as shown in fig. 7, the control method of the food processor includes the following steps:
step S301: the control unit detects an energization state of the food processor, the energization state including an on state and an off state.
As shown in fig. 8, the zero-crossing detection module includes an input end and an output end, the input end and the output end are isolated by an optical coupler, the input end of the zero-crossing detection module is provided with a unidirectional rectifier diode D1 and an optical coupler light emitting diode U1, and the output end of the zero-crossing detection module is provided with a phototriode for receiving a signal sent by the light emitting diode U1. During the work of the food processor, when the commercial power is in a positive half period, the optocoupler light-emitting diode U1 is conducted, the phototriode receives a signal sent by the light-emitting diode U1, the phototriode is conducted, and the output end of the zero-crossing detection module outputs a low level to the control unit; when the commercial power is in a negative half period, the optocoupler light-emitting diode U1 is cut off, namely the light-emitting diode U1 is not conducted, the phototriode cannot receive the signal sent by the light-emitting diode U1, the phototriode is cut off, the output end of the zero-crossing detection module outputs a high level to the control unit, and therefore the output end of the zero-crossing detection module outputs a pulse signal. The control unit judges whether the food processor is normally powered on or not by detecting the existence of the pulse signal, namely, when the control unit can normally detect the pulse signal, the power-on state of the food processor is considered to be in a conducting state, and when the control unit does not detect the pulse signal within a certain time period, the power-on state of the food processor is considered to be in a disconnecting state.
Step S302: when the power-on state is the off state, the control unit sends a braking instruction.
When the control unit detects that the power-on state of the food processor is a conduction state, the control unit executes a working program for processing the material according to the original specification of the food processor; when the control unit detects that the power-on state of the food processor is in the off state, the situation that the food processor cannot normally work due to the power failure of a power grid, the sudden lifting of a cup body or the fault of the machine and the like during the work of the food processor is described. When the control unit detects that the power-on state is the off state, the control unit sends a braking instruction to the intelligent power module of the brushless motor module, so that the brushless motor stops rapidly, and the effect of rapid braking of the food processor is achieved.
Example four:
in this embodiment, the brake protection module includes a current detection module, the food processor obtains a current value at the brushless motor module through the current detection module, and when the brushless motor module of the food processor is in an abnormal working state, the current value at the brushless motor module may be too large or too small, as shown in fig. 9, the control method of the food processor includes the following steps:
step S401: the control unit acquires a current value at the brushless motor module.
When the food processor is operating normally, the food processor is operating empty and loaded. The no-load and the load belong to the normal working state of the brushless motor, so that the working current of the brushless motor is in a certain range, namely in a set range under the no-load or the load. However, when the brushless motor is locked, the operating current value of the brushless motor deviates from the range of the preset current value, so that the current value at the brushless motor module can be detected to detect whether the brushless motor of the food processor is in a normal operating state.
Step S402: and when the current value is larger than a preset current value, the control unit sends a braking instruction.
After acquiring the current value of the brushless motor module through the current detection module, the control unit compares the current value with a preset current value A1, and determines whether to send a braking instruction according to the comparison result. In the embodiment, 15A is not less than A1 is not less than 25A, when A1 is in the range, the control unit executes the working procedure of the food processor for processing the materials according to the original specification under the normal working state, and A1 is preferably 20A; when the current value at the brushless motor module is larger than the preset current value A1, indicating that the brushless motor is locked or close, the control unit sends a braking instruction to the intelligent power module of the brushless motor module, so that the brushless motor is stopped rapidly, and the effect of rapid braking of the food processor is achieved.
Example five:
in this embodiment, the brake protection module obtains the working state of the brushless motor module at a stage, which includes a rotation starting stage, a normal rotation neutralization rotation stirring and grinding intermittent stop, or a rotation stirring completion. As shown in fig. 10, the control method of the food processor includes the steps of:
step S501: the control unit acquires the working state of the brushless motor module.
In the food processing machine stirring and crushing food materials, the working state of the brushless motor module is in a stage comprising a rotation starting stage, a normal rotation neutralization rotation stirring and crushing intermittent stop or a rotation stirring completion stage. In the using process, when the stirring and crushing intermittent stop or the rotating stirring is completed, a user may check the processing stage of the food processor in a mode of opening a cover and the like, and in consideration of the use safety of the user, the brushless motor of the brushless motor module is controlled by acquiring the stage of the working state of the brushless motor module.
Step S502: and when the working state of the brushless motor module is in the stage of stirring, crushing, intermittent stopping or rotating and stirring, the control unit sends a braking instruction.
When the working state of the brushless motor module is in the stirring and crushing intermittent stop or the rotating and stirring are completed, the brushless motor is in the process from normal rotation to stop rotation. In this embodiment, the brushless motor stops rotating by using the brake in the process from the normal rotation to the stop of the rotation, so that the brushless motor can stop rotating quickly. In this embodiment, when it is detected that the brushless motor is in the stirring and pulverizing intermittent stop stage or the rotating and stirring completion stage, the control unit sends a braking instruction to the intelligent power module of the brushless motor module, so that the brushless motor is stopped rapidly, that is, the rapid braking effect of the food processor is achieved.
Example six:
as shown in fig. 11 to 13, this embodiment provides a food processor, the food processor includes a base 1 and a mixing cup 2 disposed on the base, the mixing cup includes a cup 21 and a cup cover 22 mounted on the cup, the food processor further includes a brushless motor module 3 disposed in the base for mixing and pulverizing materials and a control unit 4 for controlling the brushless motor module, the food processor further includes a brake protection module (not shown in the drawings), when the brushless motor module 3 is in a working state, the brake protection module obtains a brake protection signal and sends the brake protection signal to the control unit 4, and the control unit 4 sends a brake instruction to the brushless motor module 3 according to the brake protection signal, so that the brushless motor module executes a protective brake shutdown.
As shown in fig. 11 and 12, the brushless motor module includes an intelligent power module, a brushless motor 31 and a motor support 32, the intelligent power module includes a power switch device and a driving circuit, when the food processor needs to be shut down quickly due to a power supply line failure or for safety of the food processor, the control unit 4 detects and obtains a brake protection signal that the food processor needs to be shut down quickly, the control unit 4 analyzes the brake protection signal, and when the food processor needs to be shut down quickly, the control pin outputs a brake command to the intelligent power module of the brushless motor module.
The brushless motor module includes three upper arm switches and three lower arm switches, as shown in fig. 12 and 13, the PWM _ UH, PWM _ VH, PWM _ WH, PWM _ UL, PWM _ VL, and PWM _ WL are six PWM wave signals, where the PWM _ UH, PWM _ VH, and PWM _ WH are three upper arm switches for controlling the IPM, and the PWM _ UL, PWM _ VL, and PWM _ WL are three lower arm switches for controlling the IPM. And the brushless motor module sets the three lower arm switches to be at a low level according to the braking instruction to enable the three-phase stator winding of the brushless motor module to be in short circuit, so that the brushless motor module is braked and stopped. Brake instruction drive intelligent power module makes brushless motor's three-phase stator winding all by the short circuit to the realization is in the power generation state with brushless motor, because brushless motor winding's resistance is less, so the return circuit produces great electric current, brushless motor's kinetic energy can be released fast, thereby makes brushless motor instantaneously produce very big braking torque, can reach brushless motor fast stalling, reaches the effect of food preparation machine fast brake promptly.
The food processor comprises a Hall detection module, and the control unit acquires the rotating speed of the brushless motor in the brushless motor module through the Hall detection module and controls the brushless motor according to the rotating speed of the brushless motor.
The control unit acquires the rotating speed of the brushless motor in the brushless motor module through the Hall detection module, and when the rotating speed of the brushless motor is not greater than a preset value T1, the brushless motor is controlled by square waves; and when the rotating speed of the brushless motor is greater than a preset value T1, controlling the brushless motor by adopting a sine wave.
When the food processor is started, large torque is needed to provide large power for starting, so that the brushless motor is controlled to start by adopting square waves, the power density of the square wave control is 15.4% higher than that of sine starting when the motor is started, and the starting torque is also large, so that the requirement of large starting torque needed by wall breaking is just met. The food processor can detect the real-time rotating speed of the brushless motor by adopting the Hall detection module. When the rotating speed of the brushless motor is greater than the preset value T1, the value range of T1 is 1000 rpm-5000 rpm, in the embodiment, T1=3000rpm, which shows that the brushless motor of the food processor is basically stable in operation and does not need larger torque any more, and at the moment, the brushless motor is controlled by adopting sine waves, compared with square wave control, the torque pulsation is smaller, and the noise and vibration are smaller when the whole machine operates.
In the embodiment, the brake protection module comprises at least one of an uncovering detection module, a zero-crossing detection module and a current detection module, and the uncovering detection module is used for detecting the opening state of a cup cover of the stirring cup; the zero-crossing detection module is used for detecting a pulse signal and acquiring the power-on state of the food processor according to the pulse signal; the current detection module is used for acquiring a current value at the brushless motor module.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, i.e. all equivalent variations and modifications made by the present invention are covered by the scope of the claims of the present invention, which is not limited by the examples herein.
Claims (10)
1. A control method of a food processor comprises a base, a brushless motor module arranged in the base, a control unit for controlling the brushless motor module, and a stirring cup arranged on the base, wherein the stirring cup comprises a cup body and a cup cover arranged on the cup body, and the control method comprises the following steps:
the control unit acquires a brake protection signal and sends a brake instruction according to the brake protection signal;
and the brushless motor module executes protective brake shutdown according to the brake command.
2. The control method of a food processor as defined in claim 1, wherein the control unit obtaining a brake protection signal and issuing a brake command in accordance with the brake protection signal comprises:
the control unit acquires the working state of the food processor, and when the working state is an abnormal working state, the control unit sends a braking instruction.
3. The control method of a food processor as defined in claim 2, wherein the control unit obtaining the operating state of the food processor comprises:
the control unit acquires one or more combinations of the opening state of the cup cover of the stirring cup, the power-on state of the food processor and the current value at the brushless motor module;
the opening state comprises an opening state and a closing state, and the opening state is an abnormal state; the power-on state comprises a power-on state and a power-off state, and the power-off state is an abnormal state; and the current value is in an abnormal state when being larger than a preset current value.
4. The control method of a food processor as defined in claim 1, wherein the control unit obtaining a brake protection signal and issuing a brake command in accordance with the brake protection signal comprises:
the control unit obtains the stage of the working state of the food processor, and when the brushless motor module intermittently stirs, crushes and intermittently stops rotating the material or stirs the material, the control unit sends a braking instruction.
5. The control method of a food processor as set forth in claim 1, further comprising:
the control unit acquires the rotating speed of a brushless motor in the brushless motor module, and when the rotating speed of the brushless motor is not greater than a preset value T1, the brushless motor is controlled by square waves; and when the rotating speed of the brushless motor is greater than a preset value T1, controlling the brushless motor by adopting a sine wave.
6. The method of claim 1, wherein the brushless motor module performing a protective brake shutdown in accordance with the brake command comprises:
and the brushless motor module sets three lower arm switches of the brushless motor in the brushless motor module to be low level according to the braking instruction, so that the three-phase stator winding of the brushless motor module is in short circuit, and the brushless motor module is braked and stopped.
7. The utility model provides a food preparation machine, includes the frame, locates brushless motor module and control in the frame brushless motor module's the control unit, locates stirring cup on the frame, the stirring cup includes the cup and installs bowl cover on the cup, a serial communication port, food preparation machine still includes brake protection module, works as when the brushless motor module is in operating condition, brake protection module acquires brake protection signal and will brake protection signal sends control unit, control unit basis brake protection signal sends brake instruction to brushless motor module to make brushless motor module carry out the protectiveness brake and shut down.
8. The food processor of claim 7, wherein the brake protection module comprises at least one of a cover opening detection module, a zero crossing detection module and a current detection module, the cover opening detection module being configured to detect an open state of a lid of the blender cup; the zero-crossing detection module is used for detecting a pulse signal and acquiring the power-on state of the food processor according to the pulse signal; the current detection module is used for acquiring a current value at the brushless motor module.
9. The food processor of claim 7, wherein the brushless motor module includes a three-way upper arm switch and a three-way lower arm switch, and wherein the brushless motor module shorts the three-phase stator windings of the brushless motor module by placing the three-way lower arm switch low in response to the brake command to brake the brushless motor module to a shutdown.
10. A food processor as claimed in any one of claims 7 to 9, further comprising a hall detection module, wherein the control unit obtains the rotational speed of the brushless motor in the brushless motor module via the hall detection module and controls the brushless motor according to the rotational speed of the brushless motor.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910171196.3A CN111657762A (en) | 2019-03-07 | 2019-03-07 | Food processing machine and control method thereof |
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| CN201910171196.3A CN111657762A (en) | 2019-03-07 | 2019-03-07 | Food processing machine and control method thereof |
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| CN115085610A (en) * | 2022-08-22 | 2022-09-20 | 深圳市好盈科技有限公司 | Linear brake control method and device applied to competition-level remote control model car |
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