CN113014154A - Motor control method, device and circuit and household appliance - Google Patents
Motor control method, device and circuit and household appliance Download PDFInfo
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- CN113014154A CN113014154A CN201911308018.7A CN201911308018A CN113014154A CN 113014154 A CN113014154 A CN 113014154A CN 201911308018 A CN201911308018 A CN 201911308018A CN 113014154 A CN113014154 A CN 113014154A
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- motor
- driving voltage
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000001514 detection method Methods 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 3
- 235000013305 food Nutrition 0.000 claims description 3
- 235000011389 fruit/vegetable juice Nutrition 0.000 claims description 3
- 238000005406 washing Methods 0.000 claims description 3
- 235000010469 Glycine max Nutrition 0.000 claims 1
- 244000068988 Glycine max Species 0.000 claims 1
- 239000008267 milk Substances 0.000 claims 1
- 210000004080 milk Anatomy 0.000 claims 1
- 235000013336 milk Nutrition 0.000 claims 1
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000008569 process Effects 0.000 description 5
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 235000013322 soy milk Nutrition 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Classifications
-
- 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
- H02P6/08—Arrangements for controlling the speed or torque of a single motor
-
- 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
- H02P2207/00—Indexing scheme relating to controlling arrangements characterised by the type of motor
- H02P2207/05—Synchronous machines, e.g. with permanent magnets or DC excitation
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a motor control method, a device, a circuit and a household appliance, wherein the control method comprises the following steps: obtaining the phase current of a motor; and switching the driving voltage of the motor between a first driving voltage and a second driving voltage according to the value of the phase current of the motor so as to enable the phase current value to be in a preset interval range. The voltage of the motor is between the first driving voltage and the second driving voltage, the first driving voltage is different from the second driving voltage, namely the first driving voltage is larger than or smaller than the second driving voltage, and the two different driving voltages are controlled to be switched back and forth according to the obtained phase current value, so that the phase current value can be kept in a stable interval, the peak value of the phase current is prevented from occurring to protect the motor, the motor rotating speed can be prevented from being seriously influenced by reduction, and the motor efficiency is ensured while the safety of the motor is ensured.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a motor control method, a motor control device, a motor control circuit and a household appliance.
Background
The brushless motor utilizes electronic commutation to replace mechanical commutation, overcomes a series of problems caused by brush friction of the traditional direct current motor, and has the advantages of good speed regulation performance, small volume, high efficiency and the like. The brushless direct current motor has the characteristics of high efficiency, large starting torque, convenient control and the like, so that the brushless direct current motor has wider and wider application fields. The brushless direct current motor mainly comprises a motor body and a controller. The controller part comprises a control chip, a power driving circuit, a position detection circuit, a signal feedback circuit and the like; wherein control chip sends control signal to drive circuit, the signal gives the switch tube through enlargiing, motor phase current undersize motor speed is lower, the inefficiency of motor, for making the high-speed high-efficient operation of motor, can give motor winding with driving voltage as much as possible, but during driving voltage constantly excited machine winding, the phase current can constantly rise, the electric current if not restrict this moment, can lead to the electric current peak value to exceed the switch tube bearable scope, thereby lead to the switch tube to burn out, cause the motor to become invalid, consequently, how to keep the stability of motor phase current to become the technical problem who awaits the solution urgently.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is how to maintain the stability of the phase current.
According to a first aspect, an embodiment of the present invention provides a motor control method, including: obtaining the phase current of a motor; and switching the driving voltage of the motor between a first driving voltage and a second driving voltage according to the value of the phase current of the motor so as to enable the phase current value to be in a preset interval range, wherein the first driving voltage is different from the second driving voltage.
Optionally, the switching the driving voltage of the motor between a first driving voltage and a second driving voltage according to the motor phase current value includes: judging whether the phase current is larger than a first preset value or not; when the current of the motor is larger than a first preset value, driving the motor to rotate by using a second driving voltage until the current is smaller than a second preset value, driving the motor to rotate by using the first driving voltage, and returning to the step of obtaining the phase current of the motor; the first preset value is larger than the second preset value and is located in the preset interval, and the second driving voltage is smaller than the first driving voltage.
Optionally, the second drive voltage is zero.
Optionally, the switching the driving voltage of the motor between a first driving voltage and a second driving voltage according to the motor phase current value includes: judging whether the phase current value is larger than a first preset value or not; when the phase current value is greater than the first preset value; outputting a second duty ratio control signal to control output of a second driving voltage, and outputting a first duty ratio control signal to control output of a first driving voltage until the current value is smaller than a second preset value; the first preset value is larger than the second preset value and is located in the preset interval, and the second duty cycle is smaller than the first duty cycle.
Optionally, the second duty cycle is zero.
According to a second aspect, an embodiment of the present invention provides a motor control apparatus, including: the acquisition module is used for acquiring the phase current of the motor; and the switching module is used for switching the driving voltage of the motor between a first driving voltage and a second driving voltage according to the motor phase current value so as to enable the phase current value to be in a preset interval range.
According to a third aspect, an embodiment of the present invention provides a motor control circuit, including: the driving module is used for outputting driving voltage; the detection module is used for detecting the phase current of the motor; a feedback module, disposed between the detection module and the driving module, for feeding back the phase current to the driving module, so that the driving module executes the motor control method of any of the above first aspects.
Optionally, the driving module comprises: the control unit is connected with the feedback module and used for outputting a duty ratio control signal; and the driving unit is connected to a power supply and outputs the driving voltage under the control of the duty ratio control signal.
According to a fourth aspect, an embodiment of the present invention provides a household appliance, including: a motor, and the motor control circuit of the third aspect.
Optionally, the household appliance comprises at least one of a soymilk machine, a broken food machine, a juice extractor, a washing machine, an air conditioner and a dust collector.
According to the motor control method, the motor control device, the motor control circuit and the household appliance, the phase current of the motor is obtained in real time, the voltage of the motor is between the first driving voltage and the second driving voltage according to the phase current, the first driving voltage is different from the second driving voltage, namely the first driving voltage is larger than or smaller than the second driving voltage, the two different driving voltages are controlled to be switched back and forth according to the obtained value of the phase current, so that the value of the phase current can be kept in a stable interval, the phase current is prevented from generating a peak value to protect the motor, the motor speed can be prevented from being reduced too seriously, and the motor efficiency and the safety can be guaranteed.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 shows a schematic diagram of a motor control method of the present embodiment;
fig. 2 shows a schematic illustration of another motor control method of the present embodiment;
fig. 3 shows a schematic illustration of another motor control method of the present embodiment;
fig. 4 shows a schematic diagram of a control unit in the motor control circuit of the present embodiment.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides a motor control method, which is used for controlling a motor to maintain a stable phase current, and specifically, as shown in fig. 1, the method may include the following steps:
s1, obtaining a motor phase current. In this embodiment, in the operation process of the motor, the motor control circuit outputs a duty ratio control signal, that is, a Pulse Width Modulation (PWM) signal, and the PWM signal controls the driving circuit to output a driving voltage to generate a phase current, which may specifically include a three-phase current, and the phase current may be sampled by the current detection circuit to obtain data of a required phase current.
And S2, switching the driving voltage of the motor between a first driving voltage and a second driving voltage according to the phase current value of the motor so as to enable the phase current value to be within a preset interval range. In this embodiment, when the motor operates at high speed and high power, the peak value of the phase current is larger, but the device used by the hardware circuit has the maximum current limit, so that the maximum current threshold is set for protecting the electronic device and ensuring the reliable operation of the motor; meanwhile, in order to avoid the fluctuation of the rotating speed, a minimum current threshold value is set, so that the motor can run reliably and stably.
The driving voltage of the motor is in direct proportion to the phase current of the motor, when the driving voltage is large, the phase current of the motor can be correspondingly increased, when the driving voltage is reduced, the phase current can be correspondingly reduced, in the embodiment, the voltage of the motor is between the first driving voltage and the second driving voltage, the first driving voltage is different from the second driving voltage, namely the first driving voltage is greater than or less than the second driving voltage, and the phase current can be kept in a stable interval by controlling the back-and-forth switching of the two different driving voltages according to the obtained value of the phase current, so that the peak value of the phase current is prevented from appearing to protect the motor, the reduction can be prevented from seriously affecting the rotating speed of the motor, and the safety of the motor can be ensured while the efficiency of the motor is ensured.
How the drive voltage of the motor is switched between the first drive voltage and the second drive voltage according to the phase current value will be described in detail below. As an alternative embodiment, the voltage value may be directly compared with the preset voltage value, and specifically, as shown in fig. 2, the method may include the following steps:
s21, judging whether the phase current is larger than a first preset value or not. In this embodiment, the first preset value may be a maximum current limit value of a hardware part of the motor, and of course, to prevent the influence of the overcurrent on the hardware, the first preset value may also be smaller than the maximum current limit value. When the phase current is greater than the first preset value, the process proceeds to step S22. And when the phase current is smaller than the first preset value, returning to the step S1 to continuously acquire the motor phase current.
And S22, driving the motor to rotate by using a second driving voltage. In this embodiment, the second driving voltage is smaller than the rated phase voltage of the motor, and after the second driving voltage is driven, the value of the phase current value is gradually decreased.
And S23, judging whether the phase current is smaller than a second preset value, wherein the second preset value can be a phase current value meeting the lowest requirement of the motor rotating speed, and in order to guarantee the motor efficiency and prevent the motor rotating speed from generating larger fluctuation, the second preset value can be larger than the phase current value meeting the lowest requirement of the motor rotating speed. In addition, in this embodiment, the first preset value needs to be greater than the second preset value, and both the first preset value and the second preset value may be located in a preset interval of phase current fluctuation. When the phase current is less than the second preset value, the process proceeds to step S24. And when the phase current is greater than the second preset value, returning to the step S22 to continue to drive the motor to rotate at the second driving voltage.
And S24, driving the motor to rotate by using a first driving voltage. In this embodiment, the second driving voltage is smaller than the first driving voltage, and specifically, the first driving voltage may be a rated phase voltage of the motor, or may be larger than the rated phase voltage of the motor. When the motor is driven to rotate at the first driving voltage, the phase current is required to return to step S1 and repeat steps S1-S24.
As another alternative embodiment, the duty ratio of the PWM signal of the motor may be controlled, specifically, the duty ratio of the PWM signal is proportional to the driving voltage; specifically, as shown in fig. 3, the method may include the following steps:
s31, judging whether the phase current is larger than a first preset value or not. In this embodiment, the first preset value may be a maximum current limit value of a hardware part of the motor, and of course, to prevent the influence of the overcurrent on the hardware, the first preset value may also be smaller than the maximum current limit value. When the phase current is greater than the first preset value, the process proceeds to step S32. And when the phase current is smaller than the first preset value, returning to the step S1 to continuously acquire the motor phase current.
And S32, outputting a second duty ratio control signal to control and output a second driving voltage to drive the motor to rotate. In this embodiment, the second duty ratio is smaller than the rated duty ratio of the motor, and the value of the phase current value is gradually decreased under the control of the second duty ratio control signal.
And S33, judging whether the phase current is smaller than a second preset value, wherein the second preset value can be a phase current value meeting the lowest requirement of the motor rotating speed, and the second preset value can be larger than the phase current value meeting the lowest requirement of the motor rotating speed in order to ensure the motor efficiency and prevent the motor rotating speed from generating larger fluctuation. In addition, in this embodiment, the first preset value needs to be greater than the second preset value, and both the first preset value and the second preset value may be located in a preset interval of phase current fluctuation. When the phase current is less than the second preset value, the process proceeds to step S34. And when the phase current is greater than the second preset value, returning to the step S32 to continue outputting the second duty ratio control signal.
And S34, outputting a first duty ratio control signal to control and output a first driving voltage to drive the motor to rotate. In this embodiment, the second duty ratio is smaller than the first duty ratio, and specifically, the first duty ratio may be a rated duty ratio of the motor, or may be larger than the rated duty ratio of the motor. When the motor is controlled to rotate by the first duty control signal, the phase current is required to return to step S1 and repeat steps S1-S34.
An embodiment of the present invention provides a motor control device, including: the acquisition module is used for acquiring the phase current of the motor; and the switching module is used for switching the driving voltage of the motor between a first driving voltage and a second driving voltage according to the motor phase current value so as to enable the phase current value to be in a preset interval range.
The embodiment of the invention provides a motor control circuit, which is characterized by comprising: the driving module is used for outputting driving voltage; the detection module is used for detecting the phase current of the motor; and the feedback module is arranged between the detection module and the driving module and used for feeding back the phase current to the driving module so as to enable the driving module to execute the motor control method in any one of the embodiments. In this embodiment, the driving module may include: the control unit is connected with the feedback module and used for outputting a duty ratio control signal; and the driving unit is connected to a power supply and outputs the driving voltage under the control of the duty ratio control signal. Specifically, the control unit may be as shown in fig. 4, and the control unit includes one or more processors 41 and a memory 42, where one processor 41 is taken as an example in fig. 4.
The control unit may further include: an input device 43 and an output device 44.
The processor 41, the memory 42, the input device 43 and the output device 44 may be connected by a bus or other means, and fig. 4 illustrates the connection by a bus as an example.
The processor 41 may be a Central Processing Unit (CPU). The Processor 41 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 42, which is a non-transitory computer readable storage medium, can be used for storing non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the control methods in the embodiments of the present application. The processor 41 executes various functional applications of the server and data processing, i.e., implements the control method of the above-described method embodiment, by running non-transitory software programs, instructions, and modules stored in the memory 42.
The memory 42 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of a processing device operated by the server, and the like. Further, the memory 42 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 42 may optionally include memory located remotely from processor 41, which may be connected to a network connection device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 43 may receive input numeric or character information and generate key signal inputs related to user settings and function control of the processing device of the server. The output device 44 may include a display device such as a display screen.
One or more modules are stored in the memory 42 and, when executed by the one or more processors 41, perform the methods shown in fig. 1-3.
An embodiment of the present invention provides a home appliance, including: a motor, and a motor control circuit described in the above embodiments. In another embodiment, the household appliance includes at least one of a soymilk machine, a broken food processor, a juice extractor, a washing machine, an air conditioner and a dust collector.
Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (10)
1. A motor control method, comprising:
obtaining the phase current of a motor;
and switching the driving voltage of the motor between a first driving voltage and a second driving voltage according to the value of the phase current of the motor so as to enable the phase current value to be in a preset interval range, wherein the first driving voltage is different from the second driving voltage.
2. The motor control method according to claim 1, characterized in that: the switching the driving voltage of the motor between a first driving voltage and a second driving voltage according to the motor phase current value includes:
judging whether the phase current is larger than a first preset value or not;
when the current of the motor is larger than a first preset value, driving the motor to rotate by using a second driving voltage until the current is smaller than a second preset value, driving the motor to rotate by using the first driving voltage, and returning to the step of obtaining the phase current of the motor;
the first preset value is larger than the second preset value and is located in the preset interval, and the second driving voltage is smaller than the first driving voltage.
3. The motor control method according to claim 2,
the second drive voltage is zero.
4. The motor control method according to claim 1, wherein the switching the drive voltage of the motor between a first drive voltage and a second drive voltage according to the motor phase current value includes:
judging whether the phase current value is larger than a first preset value or not;
when the phase current value is greater than the first preset value; outputting a second duty ratio control signal to control output of a second driving voltage, and outputting a first duty ratio control signal to control output of a first driving voltage until the current value is smaller than a second preset value;
the first preset value is larger than the second preset value and is located in the preset interval, and the second duty cycle is smaller than the first duty cycle.
5. The motor control method according to claim 4,
the second duty cycle is zero.
6. A motor control apparatus, comprising:
the acquisition module is used for acquiring the phase current of the motor;
and the switching module is used for switching the driving voltage of the motor between a first driving voltage and a second driving voltage according to the motor phase current value so as to enable the phase current value to be in a preset interval range.
7. A motor control circuit, comprising:
the driving module is used for outputting driving voltage;
the detection module is used for detecting the phase current of the motor;
a feedback module, disposed between the detection module and the driving module, for feeding back the phase current to the driving module, so that the driving module executes the motor control method according to any one of claims 1 to 5.
8. The motor control circuit of claim 7 wherein said drive module comprises:
the control unit is connected with the feedback module and used for outputting a duty ratio control signal;
and the driving unit is connected to a power supply and outputs the driving voltage under the control of the duty ratio control signal.
9. A household appliance, characterized in that it comprises:
a motor, and a motor control circuit as claimed in claim 7 or 8.
10. Household appliance according to claim 9,
the household appliance comprises at least one of a soybean milk machine, a broken-wall food processor, a juice extractor, a washing machine, an air conditioner and a dust collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911308018.7A CN113014154A (en) | 2019-12-18 | 2019-12-18 | Motor control method, device and circuit and household appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911308018.7A CN113014154A (en) | 2019-12-18 | 2019-12-18 | Motor control method, device and circuit and household appliance |
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| Publication Number | Publication Date |
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| CN113014154A true CN113014154A (en) | 2021-06-22 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201911308018.7A Pending CN113014154A (en) | 2019-12-18 | 2019-12-18 | Motor control method, device and circuit and household appliance |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000166277A (en) * | 1998-11-27 | 2000-06-16 | Matsushita Seiko Co Ltd | Current detection control device of dc motor and electric equipment for mounting the device |
| CN103348581A (en) * | 2011-03-18 | 2013-10-09 | 日立工机株式会社 | Electric power tool |
| CN106329957A (en) * | 2015-06-29 | 2017-01-11 | 南京德朔实业有限公司 | Electric tool and control method thereof |
| CN109981030A (en) * | 2019-03-21 | 2019-07-05 | 珠海格力电器股份有限公司 | Bus overvoltage protects circuit, control method and magnetic suspension compressor |
-
2019
- 2019-12-18 CN CN201911308018.7A patent/CN113014154A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000166277A (en) * | 1998-11-27 | 2000-06-16 | Matsushita Seiko Co Ltd | Current detection control device of dc motor and electric equipment for mounting the device |
| CN103348581A (en) * | 2011-03-18 | 2013-10-09 | 日立工机株式会社 | Electric power tool |
| CN106329957A (en) * | 2015-06-29 | 2017-01-11 | 南京德朔实业有限公司 | Electric tool and control method thereof |
| CN109981030A (en) * | 2019-03-21 | 2019-07-05 | 珠海格力电器股份有限公司 | Bus overvoltage protects circuit, control method and magnetic suspension compressor |
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