CN111682805B - Control method of driving assembly, air conditioner and computer readable storage medium - Google Patents
Control method of driving assembly, air conditioner and computer readable storage medium Download PDFInfo
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- CN111682805B CN111682805B CN202010571272.2A CN202010571272A CN111682805B CN 111682805 B CN111682805 B CN 111682805B CN 202010571272 A CN202010571272 A CN 202010571272A CN 111682805 B CN111682805 B CN 111682805B
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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
- H02P6/08—Arrangements for controlling the speed or torque of a single motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
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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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- 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
- H02P6/28—Arrangements for controlling current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention provides a control method of a driving assembly, an air conditioner and a computer readable storage medium, wherein the control method of the driving assembly comprises the following steps: acquiring a demagnetization protection value of the driving component; and controlling the driving component to stop based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value. According to the control method of the driving assembly, the control module can acquire the demagnetization protection value of the driving assembly in the operation process of the driving assembly, the control module generates or stores the demagnetization protection threshold value according to the type or the model of the driving assembly, the control module compares the acquired demagnetization protection value of the driving assembly with the demagnetization protection threshold value, under the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value, the driving assembly is indicated to have the risk of permanent demagnetization, the driving assembly is controlled to stop, permanent demagnetization caused by continuous operation of the driving assembly is avoided, further, insufficient power is avoided when the driving assembly operates again, and the refrigerating or heating effect of the driving assembly is ensured.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a control method of a driving assembly, an air conditioner and a computer readable storage medium.
Background
At present, a permanent magnet of a compressor is made of a rare earth magnetic material such as neodymium iron boron, and the rare earth magnetic material is easy to demagnetize in a high-temperature or strong magnetic field environment. If the compressor generates irreversible demagnetization, the output torque of the compressor is insufficient, and the refrigeration effect is poor.
In the related art, in order to prevent the compressor from irreversible demagnetization, a temperature sensor is usually embedded in a stator of the compressor, and the compressor is protected according to the temperature of the stator of the compressor, but an additional temperature sensor needs to be arranged on the stator to protect the compressor through the temperature of the stator of the compressor, so that the assembly difficulty of the compressor is increased, and the cost of the compressor is increased.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the invention proposes a control method of a drive assembly.
A second aspect of the present invention provides an air conditioner.
A third aspect of the invention proposes a computer-readable storage medium.
In view of this, a first aspect of the present invention provides a control method of a drive assembly, including: acquiring a demagnetization protection value of the driving component; and controlling the driving component to stop based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value.
According to the control method of the driving assembly, the control module can acquire the demagnetization protection value of the driving assembly in the running process of the driving assembly, the control module generates or stores the demagnetization protection threshold value according to the type or model of the driving assembly, the control module compares the acquired demagnetization protection value of the driving assembly with the demagnetization protection threshold value, under the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value, the driving assembly is indicated to have a permanent demagnetization risk, the driving assembly is controlled to stop to avoid permanent demagnetization caused by continuous running of the driving assembly, further, insufficient power is avoided when the driving assembly runs again, and the refrigerating or heating effect of the driving assembly is ensured; and because the protection to the drive assembly is realized through detecting the demagnetization protection value of the drive assembly, the permanent demagnetization of the drive assembly can be prevented without arranging additional components on the drive assembly, the assembly difficulty of the drive assembly is reduced, the assembly process of the drive assembly is simpler, and the cost of the drive assembly is reduced while the assembly efficiency of the drive assembly is improved.
In addition, the control method of the driving assembly in the above technical solution provided by the present invention may further have the following additional technical features:
in one technical solution of the present invention, obtaining the demagnetization protection value of the driving component includes: acquiring the back electromotive force of the driving component; and acquiring the demagnetization protection value of the driving component according to the back electromotive force.
In the technical scheme, the control module acquires the back electromotive force of the driving assembly, and then calculates the demagnetization protection value of the driving assembly according to the back electromotive force of the driving assembly, so that the demagnetization protection value is acquired without adding an additional detection component, and the structure of the driving assembly is simplified.
In one technical solution of the present invention, obtaining the demagnetization protection value of the driving component includes: acquiring quadrature axis counter electromotive force of a driving assembly; acquiring direct-axis counter electromotive force of a driving assembly; and acquiring the demagnetization protection value of the driving component according to the quadrature axis counter electromotive force and the direct axis counter electromotive force.
In the technical scheme, the control module simultaneously acquires quadrature axis back electromotive force of the driving assembly and direct axis back electromotive force of the driving assembly, and acquires demagnetization protection value of the driving assembly according to the quadrature axis back electromotive force of the driving assembly and the direct axis back electromotive force of the driving assembly, so that the acquired demagnetization protection value is more accurate, deviation caused by detection precision is reduced, further, the shutdown opportunity of the driving assembly is more accurate, the driving assembly is effectively protected, meanwhile, the false shutdown caused by detection errors is avoided, sufficient refrigeration or heating capacity is obtained during the operation of the equipment, and the influence on the normal operation of the equipment caused by the shutdown protection of the driving assembly is reduced.
In one aspect of the present invention, obtaining quadrature-axis back electromotive force of the driving assembly includes: acquiring quadrature axis voltage of a driving assembly; acquiring quadrature axis current of a driving assembly; acquiring direct-axis current of a driving assembly; collecting the rotor angular speed of the driving assembly; and acquiring quadrature axis counter electromotive force of the driving assembly according to the quadrature axis voltage, the quadrature axis current, the direct axis inductance of the driving assembly, the stator resistance value of the driving assembly and the rotor angular speed.
In the technical scheme, the control module can obtain quadrature axis voltage, quadrature axis current and direct axis current of the driving assembly, the angular speed of the rotor is collected without arranging an additional detection component, the direct axis inductance and the stator resistance value of the driving component are inherent data, may be stored within the control module, and may be stored in correspondence with the model and/or type of drive assembly, when the two data are needed to be used, the control module calls the driving component according to the model and/or the type of the driving component, and then realize the acquirement to the quadrature axis back electromotive force, the acquisition process is simple, convenient, need not complicated detection part, also need not complicated calculation, has simplified the operand among the drive assembly demagnetization protection process, and control module can judge whether there is the risk of taking place permanent demagnetization drive assembly fast for the protection to drive assembly is more timely effective.
In one aspect of the present invention, obtaining the direct-axis back electromotive force of the driving assembly includes: acquiring a direct-axis voltage of a driving assembly; acquiring quadrature axis current of a driving assembly; acquiring direct-axis current of a driving assembly; collecting the rotor angular speed of the driving assembly; and acquiring the direct-axis counter electromotive force of the driving assembly according to the direct-axis voltage, the direct-axis current, the quadrature-axis inductance of the driving assembly, the stator resistance value of the driving assembly and the rotor angular speed.
In the technical scheme, the control module can obtain the direct-axis voltage, the direct-axis current and the quadrature-axis current of the driving component, the angular speed of the rotor is collected without arranging an additional detection component, the quadrature axis inductance and the stator resistance value of the driving component are inherent data, may be stored within the control module, and may be stored in correspondence with the model and/or type of drive assembly, when the two data are needed to be used, the control module calls the driving component according to the model and/or the type of the driving component, and then realize the acquisition to the direct axis back electromotive force, the acquisition process is simple, convenient, need not complicated detection part, also need not complicated calculation, has simplified the operand among the drive assembly demagnetization protection course, and control module can judge whether there is the risk of taking place permanent demagnetization drive assembly fast for the protection to drive assembly is more timely effective.
In an embodiment of the present invention, before controlling the driving component to stop based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold, the method for controlling the driving component further includes: and acquiring a demagnetization protection threshold value according to the rated flux linkage of the driving assembly, the demagnetization coefficient of the driving assembly and the rotor angular speed of the driving assembly.
In the technical scheme, the control module calculates the demagnetization protection threshold value of the driving component according to the rated flux linkage of the driving component, the demagnetization coefficient of the driving component and the rotor angular speed of the driving component, so that the demagnetization protection threshold value is more accurate, and the driving component is further effectively protected.
In an embodiment of the present invention, before obtaining the demagnetization protection threshold according to the rated flux linkage of the driving component, the demagnetization factor of the driving component, and the rotor angular velocity of the driving component, the method for controlling the driving component further includes: and acquiring the demagnetization coefficient of the driving component according to the temperature rise threshold value of the driving component.
According to the technical scheme, according to a temperature rise threshold value, the demagnetization coefficient of the driving assembly is obtained, and different temperature rise threshold values correspond to different demagnetization coefficients, so that a demagnetization protection threshold value can be determined according to the temperature rise threshold value; because the drive assembly of different grade type possesses different temperature rise threshold values, demagnetization protection threshold value corresponds with the temperature rise threshold value for demagnetization protection threshold value is more accurate, and then makes the protection to drive assembly more reasonable.
In one aspect of the present invention, the method for controlling the driving assembly further includes: and controlling the alarm component to send out an alarm based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value.
In the technical scheme, the control module can control the driving assembly to stop based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value, and meanwhile, an alarm is sent to a user to remind the user that the driving assembly stops due to a fault, so that the user can timely overhaul the driving assembly, and the influence on the normal use of the equipment by the user due to the fault stop of the driving assembly is avoided.
A second aspect of the present invention provides an air conditioner comprising a memory and a processor; the memory is configured to store executable instructions; the processor is configured to execute the stored instructions to implement the steps of the control method of the driving assembly according to any one of the above-mentioned technical solutions, and therefore, the air conditioner has all the advantages of the control method of the driving assembly according to any one of the above-mentioned technical solutions.
A third aspect of the present invention provides a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the method for controlling a drive assembly according to any one of the above-mentioned technical solutions, and therefore, has all the advantages of the method for controlling a drive assembly according to any one of the above-mentioned technical solutions.
Additional aspects and advantages 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
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a flow chart of a control method of a drive assembly according to one embodiment of the invention;
FIG. 2 shows a flow chart of a control method of a drive assembly according to another embodiment of the invention;
FIG. 3 shows a flow chart of a control method of a drive assembly according to yet another embodiment of the invention;
FIG. 4 shows a flow chart of a control method of a drive assembly according to yet another embodiment of the invention;
FIG. 5 shows a flow chart of a control method of a drive assembly according to yet another embodiment of the invention;
FIG. 6 shows a flow chart of a control method of a drive assembly according to yet another embodiment of the invention;
fig. 7 shows a flow chart of a control method of a drive assembly according to a further embodiment of the invention;
fig. 8 shows a flowchart of a control method of a drive assembly according to yet another embodiment of the invention;
fig. 9 shows a flowchart of a control method of a driving assembly according to still another embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
A control method of the driving assembly, an air conditioner, and a computer-readable storage medium according to some embodiments of the present invention are described below with reference to fig. 1 to 9.
The first embodiment is as follows:
as shown in fig. 1, a control method of a driving assembly includes:
102, acquiring a demagnetization protection value of a driving assembly;
and 104, controlling the driving component to stop based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value.
In the process of operating the driving assembly, the control module can acquire a demagnetization protection value of the driving assembly, the control module generates or stores a demagnetization protection threshold value according to the type or model of the driving assembly, the control module compares the acquired demagnetization protection value of the driving assembly with the demagnetization protection threshold value, under the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value, the driving assembly is indicated to have a permanent demagnetization risk, the driving assembly is controlled to stop so as to avoid permanent demagnetization caused by continuous operation of the driving assembly, further, insufficient power is avoided when the driving assembly operates again, and the refrigerating or heating effect of the driving assembly is ensured; and because the protection to the drive assembly is realized through detecting the demagnetization protection value of the drive assembly, the permanent demagnetization of the drive assembly can be prevented without arranging additional components on the drive assembly, the assembly difficulty of the drive assembly is reduced, the assembly process of the drive assembly is simpler, and the cost of the drive assembly is reduced while the assembly efficiency of the drive assembly is improved.
And this application calculates the demagnetization protection value based on back electromotive force, need not to calculate the temperature of calculating the drive assembly through complicated, when realizing the demagnetization protect function of PMSM, simplifies control procedure, and then reduces controlling means's calculated amount for the response is more timely accurate.
And controlling the driving component to normally operate on the basis of the condition that the demagnetization protection value is greater than or equal to the demagnetization protection threshold value.
The driving component is a motor or a compressor, and is suitable for refrigerating and/or heating equipment, such as: devices requiring cooling, such as air conditioners or refrigerators, and devices requiring heating, such as dishwashers or water heaters.
Example two:
as shown in fig. 2, a control method of a driving assembly includes:
and step 206, controlling the driving component to stop based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value.
The control module acquires the back electromotive force of the driving assembly, and then calculates the demagnetization protection value of the driving assembly according to the back electromotive force of the driving assembly, so that the demagnetization protection value can be acquired without adding an additional detection component, and the structure of the driving assembly is simplified.
Example three:
as shown in fig. 3, a control method of a driving assembly includes:
and 308, controlling the driving component to stop based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value.
The control module simultaneously acquires the quadrature axis counter electromotive force (namely d-axis counter electromotive force) of the driving assembly and the direct axis counter electromotive force (namely q-axis counter electromotive force) of the driving assembly, and acquires the demagnetization protection value of the driving assembly according to the quadrature axis counter electromotive force of the driving assembly and the direct axis counter electromotive force of the driving assembly, so that the acquired demagnetization protection value is more accurate, the deviation caused by detection precision is reduced, further the shutdown opportunity of the driving assembly is more accurate, the driving assembly is effectively protected, meanwhile, the false shutdown caused by detection errors is avoided, sufficient refrigeration or heating capacity is obtained during the operation of the equipment, and the influence on the normal operation of the equipment caused by the shutdown protection of the driving assembly is reduced.
According to quadrature axis back electromotive force and direct axis back electromotive force, obtain drive assembly's demagnetization guard value, specifically do:
E1＝(Ed×Ed+Eq×Eq)×1.5；
wherein, E1 is the demagnetization protection value, Ed is quadrature axis counter electromotive force, and Eq is direct axis counter electromotive force.
Example four:
as shown in fig. 4, a control method of a driving assembly includes:
step 414, acquiring a demagnetization protection value of the driving component according to the quadrature axis counter electromotive force and the direct axis counter electromotive force;
and step 416, controlling the driving assembly to stop based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value.
Control module can acquire drive assembly's quadrature axis voltage, quadrature axis current and direct axis current, and gather rotor angular velocity, need not to set up extra detection component and can realize, drive assembly's direct axis inductance and stator resistance value are inherent data, can store in the control module, and correspond the storage with drive assembly's model and/or type, when needs use these two data, control module calls according to drive assembly's model and/or type, and then realize the acquireing to quadrature axis back electromotive force, it is simple, convenient to acquire the process, need not complicated detection component, also need not complicated calculation, the operand in the drive assembly demagnetization protection course has been simplified, control module can judge whether there is the risk that takes place the permanent demagnetization fast drive assembly, make the protection to drive assembly more timely effective.
According to quadrature axis voltage, quadrature axis electric current, direct axis electric current, drive assembly's direct axis inductance, drive assembly's stator resistance value and rotor angular velocity, obtain drive assembly's quadrature axis back electromotive force, specifically do:
Ed＝Ud+ω×Lq×Iq–Rs×Id；
wherein Ed is quadrature axis counter electromotive force, Ud is quadrature axis voltage, ω is rotor angular velocity, Lq is direct axis inductance, Iq is direct axis current, Rs is stator resistance value, and Id is quadrature axis current.
Example five:
as shown in fig. 5, a control method of a driving assembly includes:
502, acquiring quadrature axis counter electromotive force of a driving assembly;
and 516, controlling the driving component to stop based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value.
The control module can acquire direct-axis voltage of the driving assembly, direct-axis current and quadrature-axis current, and acquire rotor angular velocity, can realize without setting up extra detection component, quadrature-axis inductance and stator resistance value of the driving assembly are inherent data, can be stored in the control module, and correspond the storage with the model and/or the type of the driving assembly, when needing to use these two data, the control module calls according to the model and/or the type of the driving assembly, and then realize acquisition of direct-axis back electromotive force, the acquisition process is simple, convenient, need not complicated detection component, also need not complicated calculation, the operand in the demagnetization protection process of the driving assembly has been simplified, control module can judge whether there is the risk that takes place permanent demagnetization drive assembly fast, make the protection to the driving assembly more timely effective.
According to direct axis voltage, direct axis current, quadrature axis current, drive assembly's quadrature axis inductance, drive assembly's stator resistance value and rotor angular velocity, obtain drive assembly's direct axis back electromotive force, specifically do:
Eq＝Uq–ω×Ld×Id–Rs×Iq；
wherein Eq is direct-axis counter electromotive force, Uq is direct-axis voltage, ω is rotor angular velocity, Ld is quadrature-axis inductance, Iq is direct-axis current, Rs is stator resistance value, and Id is quadrature-axis current.
Example six:
as shown in fig. 6, a control method of a driving assembly includes:
and 606, controlling the driving component to stop based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value.
The control module calculates the demagnetization protection threshold value of the driving assembly according to the rated flux linkage of the driving assembly, the demagnetization coefficient of the driving assembly and the rotor angular speed of the driving assembly, so that the demagnetization protection threshold value is more accurate, and the driving assembly is protected more effectively.
According to the rated flux linkage of the driving assembly, the demagnetization coefficient of the driving assembly and the rotor angular speed of the driving assembly, a demagnetization protection threshold value is obtained, and the method specifically comprises the following steps:
E0＝(ω×ω×Ψf×Ψf)×Ecoff；
wherein E0 is a demagnetization protection threshold value, omega is a rotor angular velocity, psi f is a rated flux linkage, and Ecoff is a demagnetization coefficient.
Example seven:
as shown in fig. 7, a control method of a driving assembly includes:
and step 708, controlling the driving component to stop based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value.
According to the temperature rise threshold, acquiring a demagnetization coefficient of the driving assembly, and corresponding to different demagnetization coefficients by different temperature rise thresholds, so that a demagnetization protection threshold can be determined according to the temperature rise threshold; because the drive assembly of different grade type possesses different temperature rise threshold values, demagnetization protection threshold value corresponds with the temperature rise threshold value for demagnetization protection threshold value is more accurate, and then makes the protection to drive assembly more reasonable.
The rotor of drive assembly adopts neodymium iron boron permanent magnet material usually, and to common neodymium iron boron permanent magnet material, back electromotive force and temperature rise have negative linear relation, and every 1 degree centigrade of temperature rise, the relation between temperature rise and the remanence temperature coefficient is:
kT＝-0.1％K-1；
wherein kT is the temperature coefficient of remanence, and K is the temperature rise.
Then, every time the temperature rise is 1 degree centigrade, the remanence temperature coefficient is reduced by 0.1%, when the temperature rise threshold of the driving component is 100K, namely the temperature rise of the driving component is 100 degrees centigrade, the remanence temperature coefficient is reduced by 10%, the tolerance is less than or equal to 2%, and the demagnetization coefficient is:
ecoff (1-10%) × (1-10%) 0.81, where Ecoff is the demagnetization factor.
Namely, when the temperature rise threshold of the driving assembly is 100K, the demagnetization coefficient is 0.81.
The rated flux linkage Ψ f is specifically:
Ψf＝A×60/1000/(2×π)；
where Ψ f is the nominal flux linkage, and a is the back-emf coefficient.
The back emf coefficient corresponds to the model of the drive assembly, the back emf coefficient of each drive assembly being a fixed parameter.
Specifically, the back electromotive force coefficient of the driving unit is 15.7V/krpm (volts/kilo revolutions per minute), and Ψ f is 15.7 × 60/1000/(2 × π) is 0.15V/s (volts/sec).
Example eight:
as shown in fig. 8, a control method of a driving assembly includes:
and 806, controlling the alarm component to give an alarm based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value.
Based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value, the control module can control the driving assembly to stop, and meanwhile, an alarm is sent to a user to remind the user that the driving assembly stops due to failure, so that the user can timely overhaul the driving assembly, and the influence on normal use of equipment by the user due to the failure stop of the driving assembly is avoided.
When a demagnetization fault occurs, the frequency converter cuts off output, and the output alarm information can output fault information through an output terminal of the frequency converter.
Example nine:
as shown in fig. 9, a control method of a driving assembly includes:
step 914, obtaining a demagnetization protection value of the driving component according to the quadrature axis counter electromotive force and the direct axis counter electromotive force;
and step 920, controlling the driving assembly to stop based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value.
The control module collects quadrature axis voltage, direct axis voltage, quadrature axis current, direct axis current and rotor angular velocity of the driving assembly, and then calculates direct axis counter electromotive force and quadrature axis counter electromotive force of the driving assembly respectively by combining quadrature axis inductance, direct axis inductance and stator resistance value of the driving assembly, so as to obtain demagnetization protection value of the driving assembly; the control module compares the acquired demagnetization protection value of the driving assembly with a demagnetization protection threshold value, under the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value, the driving assembly is indicated to have a permanent demagnetization risk, the driving assembly is controlled to be stopped, permanent demagnetization caused by continuous operation of the driving assembly is avoided, further, insufficient power is avoided when the driving assembly operates again, and the refrigerating or heating effect of the driving assembly is ensured.
The quadrature axis voltage, the direct axis voltage, the quadrature axis current, the direct axis current and the rotor angular speed are operation parameters of the driving assembly acquired by the control module in real time; the direct axis inductance, the stator resistance value and the quadrature axis inductance are intrinsic parameters of the driving assembly, can be inquired in the specification of the driving assembly, and are stored in advance and controlled in the module.
The control method of the driving assembly provided by the invention does not need to install a temperature sensor on the stator for temperature detection, thereby not only reducing the cost, but also reducing the procedures of installing wiring and the like. Meanwhile, the control method of the driving assembly provided by the invention does not need precise parameters of the permanent magnet synchronous motor, realizes the demagnetization protection function of the permanent magnet synchronous motor by calculating the counter electromotive force and the actual value of demagnetization protection in the running of the permanent magnet synchronous motor and comparing the actual value with the demagnetization protection threshold value, and has the advantages of simplicity, reliability, small operand and timely and accurate response.
The actual demagnetization coefficient of the motor is calculated by the demagnetization protection value E1 being sqrt (Ed multiplied by Ed + Eq multiplied by Eq) and the demagnetization protection threshold value E0 being omega multiplied by psif, if the demagnetization coefficient allowed by the highest working temperature of the magnetic material is exceeded, the irreversible demagnetization occurs on the motor after the irreversible demagnetization coefficient occurs on the rotor, and the calculation method of the demagnetization protection actual value and the demagnetization protection threshold value is convenient for software to execute.
The demagnetization protection value can be real-time back electromotive force of the driving component, and the demagnetization protection threshold value can be a back electromotive force theoretical value.
Example ten:
an air conditioner includes a memory and a processor; the memory is configured to store executable instructions; the processor is configured to execute the stored instructions to implement the steps of the control method of the driving assembly according to any of the above embodiments, and therefore, the air conditioner has all the advantages of the control method of the driving assembly according to any of the above embodiments.
Example eleven:
a computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements the steps of the control method of a drive assembly according to any of the above embodiments, and thus has all the advantageous effects of the control method of a drive assembly according to any of the above embodiments.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically limited, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. 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 description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means 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 present invention. In the present invention, the schematic representations of the terms used above do not necessarily 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.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method of controlling a drive assembly, comprising:
acquiring a demagnetization protection value of the driving component;
controlling the driving component to stop based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value;
before controlling the driving component to stop based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value, the control method of the driving component further comprises the following steps:
and acquiring the demagnetization protection threshold value according to the rated flux linkage of the driving component, the demagnetization coefficient of the driving component and the rotor angular speed of the driving component.
2. The method according to claim 1, wherein the obtaining of the demagnetization protection value of the drive component comprises:
acquiring the back electromotive force of the driving component;
and acquiring the demagnetization protection value of the driving component according to the back electromotive force.
3. The method according to claim 1, wherein the obtaining of the demagnetization protection value of the drive component comprises:
acquiring quadrature axis back electromotive force of the driving assembly;
acquiring direct-axis counter electromotive force of the driving component;
and acquiring the demagnetization protection value of the driving component according to the quadrature axis counter electromotive force and the direct axis counter electromotive force.
4. The method of claim 3, wherein the obtaining quadrature axis back EMF of the drive assembly comprises:
acquiring quadrature axis voltage of the driving assembly;
acquiring quadrature axis current of the driving assembly;
acquiring a direct-axis current of the driving assembly;
collecting the rotor angular velocity of the driving assembly;
and acquiring quadrature axis counter electromotive force of the driving assembly according to the quadrature axis voltage, the quadrature axis current, the direct axis inductance of the driving assembly, the stator resistance value of the driving assembly and the rotor angular speed.
5. The control method of the drive assembly according to claim 3, wherein the obtaining of the direct-axis back electromotive force of the drive assembly comprises:
acquiring a direct-axis voltage of the driving assembly;
acquiring quadrature axis current of the driving assembly;
acquiring a direct-axis current of the driving assembly;
collecting the rotor angular velocity of the driving assembly;
and acquiring the direct-axis counter electromotive force of the driving assembly according to the direct-axis voltage, the quadrature-axis current, the direct-axis current, the quadrature-axis inductance of the driving assembly, the stator resistance value of the driving assembly and the rotor angular speed.
6. The method for controlling a drive assembly according to claim 1, wherein before the step of obtaining the demagnetization protection threshold value based on the rated flux linkage of the drive assembly, the demagnetization factor of the drive assembly, and the rotor angular velocity of the drive assembly, the method for controlling a drive assembly further comprises:
and acquiring the demagnetization coefficient of the driving component according to the temperature rise threshold value of the driving component.
7. The control method of the drive assembly according to any one of claims 1 to 6, further comprising:
and controlling an alarm component to send out an alarm based on the condition that the demagnetization protection value is smaller than the demagnetization protection threshold value.
8. An air conditioner, comprising:
a memory configured to store executable instructions;
a processor configured to execute stored instructions to implement the steps of the control method of the drive assembly according to any one of claims 1 to 7.
9. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the control method of a drive assembly according to any one of claims 1 to 7.
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| CN202010571272.2A CN111682805B (en) | 2020-06-22 | 2020-06-22 | Control method of driving assembly, air conditioner and computer readable storage medium |
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| CN202010571272.2A CN111682805B (en) | 2020-06-22 | 2020-06-22 | Control method of driving assembly, air conditioner and computer readable storage medium |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3125418A1 (en) * | 2015-07-27 | 2017-02-01 | Siemens Aktiengesellschaft | A method to detect or monitor the demagnetization of a magnet |
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| CN103956954B (en) * | 2014-03-27 | 2017-03-29 | 广东美的制冷设备有限公司 | The detection method and detection means of permanent-magnetic synchronous motor rotor demagnetization |
| CN103986397B (en) * | 2014-05-19 | 2016-08-24 | 安徽中家智锐科技有限公司 | Brshless DC motor permanent magnet fault detection method |
| US10295599B2 (en) * | 2017-08-11 | 2019-05-21 | GM Global Technology Operations LLC | Apparatus and method for monitoring magnet flux degradation of a permanent magnet motor |
| KR102637115B1 (en) * | 2018-11-01 | 2024-02-15 | 현대자동차주식회사 | Air compressor motor control method for fuel cell vehicle and driving method for fuel cell vehicle using the same |
| CN110011586A (en) * | 2019-03-25 | 2019-07-12 | 深圳市汇川技术股份有限公司 | Permanent magnet synchronous motor demagnetization guard method, system, device and storage medium |
| CN111022307A (en) * | 2019-12-16 | 2020-04-17 | 珠海格力节能环保制冷技术研究中心有限公司 | Compressor control method, compressor controller and air conditioning unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP3125418A1 (en) * | 2015-07-27 | 2017-02-01 | Siemens Aktiengesellschaft | A method to detect or monitor the demagnetization of a magnet |
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