CN110932638A - Air conditioner, driving device of permanent magnet synchronous motor and control method and device of driving device - Google Patents
Air conditioner, driving device of permanent magnet synchronous motor and control method and device of driving device Download PDFInfo
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- CN110932638A CN110932638A CN201911142018.4A CN201911142018A CN110932638A CN 110932638 A CN110932638 A CN 110932638A CN 201911142018 A CN201911142018 A CN 201911142018A CN 110932638 A CN110932638 A CN 110932638A
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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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/0086—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for high speeds, e.g. above nominal speed
- H02P23/009—Arrangements or methods for the control of AC motors characterised by a control method other than vector control specially adapted for high speeds, e.g. above nominal speed using field weakening
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D25/00—Pumping installations or systems
- F04D25/02—Units comprising pumps and their driving means
- F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
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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
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/14—Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
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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
- H02P25/00—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details
- H02P25/02—Arrangements or methods for the control of AC motors characterised by the kind of AC motor or by structural details characterised by the kind of motor
- H02P25/022—Synchronous motors
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Abstract
The application relates to an air conditioner, a driving device of a permanent magnet synchronous motor and a control method and a device thereof, wherein the control method comprises the following steps: acquiring the actual rotating speed and the set rotating speed of the permanent magnet synchronous motor and the three-phase current of the three-phase inverter; obtaining direct axis current and quadrature axis current according to the actual rotating speed and the set rotating speed; obtaining direct axis voltage and quadrature axis voltage according to the direct axis current, the quadrature axis current and the three-phase current; performing first conversion on the direct-axis voltage and the quadrature-axis voltage, and inputting the converted direct-axis voltage and quadrature-axis voltage into a grid driver so that the grid driver drives a three-phase inverter; and increasing the direct-axis current and reducing the quadrature-axis current according to the direct-axis voltage and the quadrature-axis voltage so as to weaken the magnetic field of the permanent magnet synchronous motor and improve the rotating speed of the permanent magnet synchronous motor. Based on this, can carry out the weak magnetism processing to PMSM according to actual rotational speed and three-phase current to weaken PMSM's magnetic field, make the rotational speed of PMSM output improve, accelerate the cold and hot exchange of air conditioner, promote user experience.
Description
Technical Field
The application relates to the technical field of permanent magnet synchronous motors, in particular to an air conditioner, a driving device of a permanent magnet synchronous motor and a control method and device of the driving device.
Background
At present, a permanent magnet synchronous motor is generally adopted to drive a fan of an air conditioner, when a three-phase inverter is used to drive the permanent magnet synchronous motor, because the voltage at the direct current side of the three-phase inverter and the output current both have upper limits, when the air conditioner works at rated power, the rotating speed output by the permanent magnet synchronous motor can only be within the range of basic speed, even if the phase voltage of the permanent magnet synchronous motor is continuously increased, the rotating speed can not be continuously increased, the speed regulation range of the constant power of the fan is limited, the speed regulation performance of the fan can not be fully optimized, the cold and heat exchange of the air conditioner can not be accelerated, and the user experience can not be improved.
Disclosure of Invention
In order to overcome the problems in the related art at least to a certain extent, the present application provides an air conditioner, a driving apparatus of a permanent magnet synchronous motor, and a control method and apparatus thereof.
According to a first aspect of the present application, there is provided a driving apparatus of a permanent magnet synchronous motor, comprising:
a three-phase inverter;
a gate driver that drives the three-phase inverter;
the current detection module is used for detecting three-phase current output by the three-phase inverter;
the rotating speed detection module is used for detecting the actual rotating speed of the permanent magnet synchronous motor;
and the controller is respectively connected with the grid driver, the current detection module and the rotating speed detection module and is used for carrying out field weakening treatment according to the actual rotating speed and the three-phase current so as to weaken the magnetic field of the permanent magnet synchronous motor and improve the rotating speed of the permanent magnet synchronous motor.
According to a second aspect of the present application, there is provided an air conditioner comprising:
a fan;
a permanent magnet synchronous motor for driving the fan;
a drive arrangement according to the first aspect of the present application for driving the permanent magnet synchronous machine.
According to a third aspect of the present application, there is provided a driving device control method for a permanent magnet synchronous motor, applied to the driving device of the permanent magnet synchronous motor according to the first aspect of the present application, comprising:
acquiring the actual rotating speed and the set rotating speed of the permanent magnet synchronous motor and the three-phase current of the three-phase inverter;
obtaining direct axis current and quadrature axis current according to the actual rotating speed and the set rotating speed;
obtaining direct axis voltage and quadrature axis voltage according to the direct axis current, the quadrature axis current and the three-phase current;
performing first conversion on the direct-axis voltage and the quadrature-axis voltage, and inputting the converted direct-axis voltage and quadrature-axis voltage to the gate driver so that the gate driver drives the three-phase inverter;
and increasing the direct-axis current and decreasing the quadrature-axis current according to the direct-axis voltage and the quadrature-axis voltage so as to weaken the magnetic field of the permanent magnet synchronous motor and improve the rotating speed of the permanent magnet synchronous motor.
Optionally, the increasing the direct-axis current and decreasing the quadrature-axis current according to the direct-axis voltage and the quadrature-axis voltage includes:
performing preset operation on the direct axis voltage and the quadrature axis voltage to obtain a first operation result;
if the first operation result is larger than the maximum power supply voltage value of the motor, inputting the difference between the first operation result and the maximum power supply voltage value of the motor into a preset proportional-derivative controller to obtain current deviation;
superimposing the current offset into the direct-axis current to update a value of the direct-axis current;
and updating the value of the quadrature-axis current according to the current limit circle rule and the updated direct-axis current.
Optionally, the obtaining of the direct axis voltage and the quadrature axis voltage according to the direct axis current, the quadrature axis current, and the three-phase current includes:
after the three-phase current is subjected to second conversion and third conversion, real-time direct axis current and real-time quadrature axis current are obtained;
inputting the real-time direct-axis current and the deviation of the direct-axis current into a first proportional-derivative-integral controller to obtain a direct-axis voltage;
and inputting the deviation between the real-time quadrature axis current and the quadrature axis current into a second proportional-derivative-integral controller to obtain the quadrature axis voltage.
Optionally, the obtaining of the direct-axis current and the quadrature-axis current according to the actual rotation speed and the set rotation speed includes:
calculating the deviation between the actual rotating speed and the set rotating speed to obtain the rotating speed deviation;
and inputting the rotating speed deviation into a speed proportional-derivative-integral controller to obtain the direct-axis current and the quadrature-axis current.
According to a fourth aspect of the present application, there is provided a driving device control device for a permanent magnet synchronous motor, applied to the driving device for a permanent magnet synchronous motor according to the first aspect of the present application, comprising:
the acquisition module is used for acquiring the actual rotating speed and the set rotating speed of the permanent magnet synchronous motor and the three-phase current of the three-phase inverter;
the first processing module is used for obtaining direct-axis current and quadrature-axis current according to the actual rotating speed and the set rotating speed;
the second processing module is used for obtaining direct axis voltage and quadrature axis voltage according to the direct axis current, the quadrature axis current and the three-phase current;
the conversion module is used for performing first conversion on the direct-axis voltage and the quadrature-axis voltage and then inputting the converted direct-axis voltage and quadrature-axis voltage to the grid driver so that the grid driver drives the three-phase inverter;
and the flux weakening module is used for increasing the direct-axis current and reducing the quadrature-axis current according to the direct-axis voltage and the quadrature-axis voltage so as to weaken the magnetic field of the permanent magnet synchronous motor and improve the rotating speed of the permanent magnet synchronous motor.
Optionally, the field weakening module includes:
the first operation unit is used for carrying out preset operation on the direct-axis voltage and the quadrature-axis voltage to obtain a first operation result;
the first processing unit is used for inputting the difference between the first operation result and the maximum power supply voltage value of the motor into a preset proportional-derivative controller to obtain current deviation if the first operation result is larger than the maximum power supply voltage value of the motor;
a first updating unit for adding the current deviation to the direct-axis current to update the value of the direct-axis current;
and the second updating unit is used for updating the value of the quadrature-axis current according to the current limit circle rule and the updated direct-axis current.
Optionally, the second processing module includes:
the conversion unit is used for converting the three-phase current into a second conversion and a third conversion to obtain a real-time direct-axis current and a real-time quadrature-axis current;
the second processing unit is used for inputting the real-time direct-axis current and the deviation of the direct-axis current into a first proportional-derivative-integral controller to obtain a direct-axis voltage;
and the third processing unit is used for inputting the deviation between the real-time quadrature axis current and the quadrature axis current into a second proportional-derivative-integral controller to obtain the quadrature axis voltage.
Optionally, the first processing module includes:
the second operation unit is used for calculating the deviation between the actual rotating speed and the set rotating speed to obtain the rotating speed deviation;
and the fourth processing unit is used for inputting the rotating speed deviation into a speed proportional-derivative-integral controller to obtain the direct-axis current and the quadrature-axis current.
The technical scheme provided by the application can comprise the following beneficial effects: the driving device of the permanent magnet synchronous motor comprises a three-phase inverter; a gate driver that drives the three-phase inverter; the current detection module is used for detecting three-phase current output by the three-phase inverter; the rotating speed detection module is used for detecting the actual rotating speed of the permanent magnet synchronous motor; and the controller is respectively connected with the grid driver, the current detection module and the rotating speed detection module and is used for carrying out field weakening treatment according to the actual rotating speed and the three-phase current so as to weaken the magnetic field of the permanent magnet synchronous motor and improve the rotating speed of the permanent magnet synchronous motor. Based on this, can carry out the weak magnetism processing to PMSM according to actual rotational speed and three-phase current to weaken PMSM's magnetic field, make the rotational speed of PMSM output improve, accelerate the cold and hot exchange of air conditioner, promote user experience.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Fig. 1 is a schematic structural diagram of a driving apparatus of a permanent magnet synchronous motor.
Fig. 2 is a schematic structural diagram of an air conditioner according to a second embodiment of the present application.
Fig. 3 is a schematic flowchart of a method for controlling a driving device of a permanent magnet synchronous motor according to a third embodiment of the present application.
Fig. 4 is a control block diagram of a driving apparatus of a permanent magnet synchronous motor according to a third embodiment of the present application.
Fig. 5 is a schematic structural diagram of a driving device control device of a permanent magnet synchronous motor according to a fourth embodiment of the present application.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
At present, a permanent magnet synchronous motor is generally adopted to drive a fan of an air conditioner, when a three-phase inverter is used to drive the permanent magnet synchronous motor, because the voltage at the direct current side of the three-phase inverter and the output current both have upper limits, when the air conditioner works at rated power, the rotating speed output by the permanent magnet synchronous motor can only be within the range of basic speed, even if the phase voltage of the permanent magnet synchronous motor is continuously increased, the rotating speed can not be continuously increased, the speed regulation range of the constant power of the fan is limited, the speed regulation performance of the fan can not be fully optimized, the cold and heat exchange of the air conditioner can not be accelerated, and the user experience can not be improved.
In order to solve the above technical problems, the present application provides an air conditioner, a driving apparatus of a permanent magnet synchronous motor, and a control method and apparatus thereof, and the following description is made by way of example.
Example one
Referring to fig. 1, fig. 1 is a schematic structural diagram of a driving device of a permanent magnet synchronous motor.
As shown in fig. 1, the driving apparatus of the permanent magnet synchronous motor provided in this embodiment may include:
a three-phase inverter 11;
a gate driver 12 that drives the three-phase inverter;
a current detection module 13 for detecting three-phase currents output by the three-phase inverter;
a rotating speed detection module 14 for detecting the actual rotating speed of the permanent magnet synchronous motor;
and the controller 15 is respectively connected with the grid driver, the current detection module and the rotating speed detection module and is used for carrying out field weakening treatment according to the actual rotating speed and the three-phase current so as to weaken the magnetic field of the permanent magnet synchronous motor and improve the rotating speed of the permanent magnet synchronous motor.
The driving device of the permanent magnet synchronous motor comprises a three-phase inverter; a gate driver driving the three-phase inverter; the current detection module is used for detecting three-phase current output by the three-phase inverter; the rotating speed detection module is used for detecting the actual rotating speed of the permanent magnet synchronous motor; and the controller is respectively connected with the grid driver, the current detection module and the rotating speed detection module and is used for carrying out field weakening treatment according to the actual rotating speed and the three-phase current so as to weaken the magnetic field of the permanent magnet synchronous motor and improve the rotating speed of the permanent magnet synchronous motor. Based on this, can carry out the weak magnetism processing to PMSM according to actual rotational speed and three-phase current to weaken PMSM's magnetic field, make the rotational speed of PMSM output improve, accelerate the cold and hot exchange of air conditioner, promote user experience.
It should be noted that the three-phase inverter is connected to the permanent magnet synchronous motor, and is configured to drive the permanent magnet synchronous motor, so as to drive the fan to rotate. The rotation speed detection module can be, but is not limited to, a hall sensor.
Example two
Referring to fig. 2, fig. 2 is a schematic structural diagram of an air conditioner according to a second embodiment of the present application.
As shown in fig. 2, the air conditioner provided by the present embodiment may include:
a fan 21;
a permanent magnet synchronous motor 22 for driving the fan;
the driving device 23 is used for driving the permanent magnet synchronous motor.
The driving device of the permanent magnet synchronous motor comprises a three-phase inverter; a gate driver driving the three-phase inverter; the current detection module is used for detecting three-phase current output by the three-phase inverter; the rotating speed detection module is used for detecting the actual rotating speed of the permanent magnet synchronous motor; and the controller is respectively connected with the grid driver, the current detection module and the rotating speed detection module and is used for carrying out field weakening treatment according to the actual rotating speed and the three-phase current so as to weaken the magnetic field of the permanent magnet synchronous motor and improve the rotating speed of the permanent magnet synchronous motor. Based on this, can carry out the weak magnetism processing to PMSM according to actual rotational speed and three-phase current to weaken PMSM's magnetic field, make the rotational speed of PMSM output improve, accelerate the cold and hot exchange of air conditioner, promote user experience.
EXAMPLE III
Referring to fig. 3, fig. 3 is a flowchart illustrating a method for controlling a driving apparatus of a permanent magnet synchronous motor according to a third embodiment of the present application.
As shown in fig. 3, the method for controlling a driving device of a permanent magnet synchronous motor according to this embodiment may include:
and S301, acquiring the actual rotating speed and the set rotating speed of the permanent magnet synchronous motor and the three-phase current of the three-phase inverter.
The actual rotating speed of the permanent magnet synchronous motor can be detected by a rotating speed detection module in a driving device of the permanent magnet synchronous motor, and the rotating speed is set to be the rotating speed expected to be reached. The rotating speed detection module can be a Hall sensor.
And step S302, obtaining direct-axis current and quadrature-axis current according to the actual rotating speed and the set rotating speed.
Specifically, the deviation between the actual rotating speed and the set rotating speed can be calculated firstly to obtain the rotating speed deviation; and then the rotating speed deviation is input into a speed proportional-derivative-integral controller to obtain direct-axis current and quadrature-axis current. The speed PID controller is a speed PID controller, and the specific principle can refer to the related art, which is not described herein again.
And step S303, obtaining direct axis voltage and quadrature axis voltage according to the direct axis current, the quadrature axis current and the three-phase current.
It should be noted that, in step S303, the real-time direct axis current and the real-time quadrature axis current are obtained after the three-phase current is subjected to the second conversion and the third conversion; then inputting the real-time direct-axis current and the deviation of the direct-axis current into a first proportional differential integral controller to obtain a direct-axis voltage; and inputting the real-time quadrature axis current and the deviation of the quadrature axis current into a second proportional-derivative-integral controller to obtain quadrature axis voltage.
The second transformation is CLARK transformation, which is to convert the to-be-transformed quantity into a stationary coordinate system, the third transformation is PARK transformation, which is to convert the to-be-transformed quantity into a rotating coordinate system, and the three-phase current is subjected to CLARK transformation and PARK transformation in sequence to obtain real-time direct-axis current and real-time quadrature-axis current.
In addition, for the specific principle of the first proportional-derivative-integral controller and the second proportional-derivative-integral controller, reference may be made to related technologies, and details are not repeated in this embodiment.
Step S304 is to perform a first conversion on the direct-axis voltage and the quadrature-axis voltage and input the converted voltages to the gate driver so that the gate driver drives the three-phase inverter.
It should be noted that the first transformation here includes two stages, the first stage is inverse PARK transformation, and the second stage is Space Vector Pulse Width Modulation (SVPWM). The direct-axis voltage and the quadrature-axis voltage can obtain two-axis static voltage after being subjected to PARK inverse transformation, then 6 pulse width modulation waveforms can be obtained after the two-axis static voltage is subjected to space vector pulse width modulation, and the three-phase inverse voltage is driven by a grid driver through the pulse width modulation waveforms.
And S305, increasing the direct-axis current and reducing the quadrature-axis current according to the direct-axis voltage and the quadrature-axis voltage so as to weaken the magnetic field of the permanent magnet synchronous motor and improve the rotating speed of the permanent magnet synchronous motor.
In step S305, the specific steps may include: performing preset operation on the direct-axis voltage and the quadrature-axis voltage to obtain a first operation result; if the first operation result is larger than the maximum power supply voltage value of the motor, inputting the difference between the first operation result and the maximum power supply voltage value of the motor into a preset proportional-differential controller to obtain current deviation; superimposing the current deviation to the direct-axis current to update the value of the direct-axis current; and updating the value of the quadrature-axis current according to the current limit circle rule and the updated direct-axis current.
The driving device of the permanent magnet synchronous motor comprises a three-phase inverter; a gate driver driving the three-phase inverter; the current detection module is used for detecting three-phase current output by the three-phase inverter; the rotating speed detection module is used for detecting the actual rotating speed of the permanent magnet synchronous motor; and the controller is respectively connected with the grid driver, the current detection module and the rotating speed detection module and is used for carrying out field weakening treatment according to the actual rotating speed and the three-phase current so as to weaken the magnetic field of the permanent magnet synchronous motor and improve the rotating speed of the permanent magnet synchronous motor. Based on this, can carry out the weak magnetism processing to PMSM according to actual rotational speed and three-phase current to weaken PMSM's magnetic field, make the rotational speed of PMSM output improve, accelerate the cold and hot exchange of air conditioner, promote user experience.
The preset operation can refer to a formula
Wherein U is the first operation result, UdIs a direct axis voltage, UqIs the quadrature voltage.
The current limit circle rule is the relationship between the direct-axis current, the quadrature-axis current and the maximum value of the motor supply current, and is specifically expressed as
Wherein, ImaxMaximum value of current supplied to motor, IdFor direct axis current, IqIs a quadrature current. Because the direct axis current increases the current deviation, the quadrature axis current can be reduced by a corresponding value according to the current limit circle rule, and therefore the purposes of increasing the direct axis current and reducing the quadrature axis current are achieved.
To further explain the control method of the present embodiment in detail, the method of the present embodiment will now be explained based on a control block diagram.
Referring to fig. 4, fig. 4 is a control block diagram of a driving apparatus of a permanent magnet synchronous motor according to a third embodiment of the present application.
As shown in fig. 4, in the following expression,
indicating a set speed of rotation, ωrRepresenting the actual speed of rotation, Ia、Ib、IcWhich represents the current of the three phases,
which represents the original direct-axis current,
representing the original quadrature axis current, idRepresenting the actual direct axis current, iqRepresenting the actual quadrature current, IdFor direct axis current, IqFor quadrature axis current, UdIs a direct axis voltage, UqIs quadrature axis voltage, UmaxThe maximum power supply voltage value of the motor is obtained.
In particular, the method comprises the following steps of,
and ωrThe rotating speed deviation is obtained through a first differentiator and then is input into a speed PID controller to obtain
And
obtaining I after superposing current deviationd，
Subtracting the quadrature axis current deviation calculated according to the current limit circle rule to obtain IqThen mix IdAnd idInputting the difference into a second differentiator to obtain a deviation, and inputting the deviation into a first PID controller to obtain Ud(ii) a Also, will IqAnd iqInputting the deviation into a second differentiator to obtain a deviation, and inputting the deviation into a second PID controller to obtain Uq(ii) a Then put UdAnd UqAnd performing PARK inverse transformation to obtain two-axis static voltage, finally performing space vector pulse width modulation on the two-axis static voltage to obtain 6 pulse width modulation waveforms, and driving the three-phase inverse voltage through a gate driver by using the pulse width modulation waveforms.
The method for acquiring the current deviation comprises the following steps: computing
Then compare
And UmaxThe size of (1) when
Greater than UmaxThen, calculate UmaxAnd
and inputting the difference into the PI controller to obtain the current deviation.
And idAnd iqIs obtained by obtaining Ia、Ib、IcTo 1, paira、Ib、IcThe CLARK transformation and the PARK transformation are sequentially carried out. For the principle of the CLARK transformation and PARK transformation, reference may be made to related technologies, and this embodiment is not described in detail.
Example four
Referring to fig. 5, fig. 5 is a schematic structural diagram of a driving device control device of a permanent magnet synchronous motor according to a fourth embodiment of the present application.
As shown in fig. 5, the driving device control device of the permanent magnet synchronous motor provided in this embodiment may include:
the acquiring module 51 is used for acquiring the actual rotating speed and the set rotating speed of the permanent magnet synchronous motor and the three-phase current of the three-phase inverter;
the first processing module 52 is used for obtaining a direct-axis current and a quadrature-axis current according to the actual rotating speed and the set rotating speed;
the second processing module 53 is configured to obtain a direct-axis voltage and an alternating-axis voltage according to the direct-axis current, the alternating-axis current and the three-phase current;
a conversion module 54, configured to perform a first conversion on the direct-axis voltage and the quadrature-axis voltage, and input the converted direct-axis voltage and quadrature-axis voltage to the gate driver, so that the gate driver drives the three-phase inverter;
and the field weakening module 55 is used for increasing the direct-axis current and decreasing the quadrature-axis current according to the direct-axis voltage and the quadrature-axis voltage so as to weaken the magnetic field of the permanent magnet synchronous motor and improve the rotating speed of the permanent magnet synchronous motor.
The driving device of the permanent magnet synchronous motor comprises a three-phase inverter; a gate driver driving the three-phase inverter; the current detection module is used for detecting three-phase current output by the three-phase inverter; the rotating speed detection module is used for detecting the actual rotating speed of the permanent magnet synchronous motor; and the controller is respectively connected with the grid driver, the current detection module and the rotating speed detection module and is used for carrying out field weakening treatment according to the actual rotating speed and the three-phase current so as to weaken the magnetic field of the permanent magnet synchronous motor and improve the rotating speed of the permanent magnet synchronous motor. Based on this, can carry out the weak magnetism processing to PMSM according to actual rotational speed and three-phase current to weaken PMSM's magnetic field, make the rotational speed of PMSM output improve, accelerate the cold and hot exchange of air conditioner, promote user experience.
Further, the field weakening module comprises:
the first operation unit is used for carrying out preset operation on the direct-axis voltage and the quadrature-axis voltage to obtain a first operation result;
the first processing unit is used for inputting the difference between the first operation result and the maximum power supply voltage value of the motor into a preset proportional differential controller to obtain current deviation if the first operation result is larger than the maximum power supply voltage value of the motor;
a first updating unit for superimposing the current deviation to the direct-axis current to update the value of the direct-axis current;
and the second updating unit is used for updating the value of the quadrature-axis current according to the current limit circle rule and the updated direct-axis current.
Further, the second processing module includes:
the conversion unit is used for converting the three-phase current into a second conversion and a third conversion to obtain a real-time direct-axis current and a real-time quadrature-axis current;
the second processing unit is used for inputting the real-time direct-axis current and the deviation of the direct-axis current into the first proportional-derivative-integral controller to obtain a direct-axis voltage;
and the third processing unit is used for inputting the real-time quadrature axis current and the deviation of the quadrature axis current into the second proportional-derivative-integral controller to obtain quadrature axis voltage.
Further, the first processing module comprises:
the second operation unit is used for calculating the deviation between the actual rotating speed and the set rotating speed to obtain the rotating speed deviation;
and the fourth processing unit is used for inputting the rotating speed deviation into the speed proportional-derivative-integral controller to obtain direct-axis current and quadrature-axis current.
With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," 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 application. In this specification, 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.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (10)
1. A driving apparatus of a permanent magnet synchronous motor, comprising:
a three-phase inverter;
a gate driver that drives the three-phase inverter;
the current detection module is used for detecting three-phase current output by the three-phase inverter;
the rotating speed detection module is used for detecting the actual rotating speed of the permanent magnet synchronous motor;
and the controller is respectively connected with the grid driver, the current detection module and the rotating speed detection module and is used for carrying out field weakening treatment according to the actual rotating speed and the three-phase current so as to weaken the magnetic field of the permanent magnet synchronous motor and improve the rotating speed of the permanent magnet synchronous motor.
2. An air conditioner, comprising:
a fan;
a permanent magnet synchronous motor for driving the fan;
the drive arrangement of claim 1 for driving the permanent magnet synchronous machine.
3. A drive device control method of a permanent magnet synchronous motor applied to the drive device of the permanent magnet synchronous motor according to claim 1, characterized by comprising:
acquiring the actual rotating speed and the set rotating speed of the permanent magnet synchronous motor and the three-phase current of the three-phase inverter;
obtaining direct axis current and quadrature axis current according to the actual rotating speed and the set rotating speed;
obtaining direct axis voltage and quadrature axis voltage according to the direct axis current, the quadrature axis current and the three-phase current;
performing first conversion on the direct-axis voltage and the quadrature-axis voltage, and inputting the converted direct-axis voltage and quadrature-axis voltage to the gate driver so that the gate driver drives the three-phase inverter;
and increasing the direct-axis current and decreasing the quadrature-axis current according to the direct-axis voltage and the quadrature-axis voltage so as to weaken the magnetic field of the permanent magnet synchronous motor and improve the rotating speed of the permanent magnet synchronous motor.
4. The method of controlling the driving apparatus of the permanent magnet synchronous motor according to claim 3, wherein the increasing the direct-axis current and the decreasing the quadrature-axis current according to the direct-axis voltage and the quadrature-axis voltage includes:
performing preset operation on the direct axis voltage and the quadrature axis voltage to obtain a first operation result;
if the first operation result is larger than the maximum power supply voltage value of the motor, inputting the difference between the first operation result and the maximum power supply voltage value of the motor into a preset proportional-derivative controller to obtain current deviation;
superimposing the current offset into the direct-axis current to update a value of the direct-axis current;
and updating the value of the quadrature-axis current according to the current limit circle rule and the updated direct-axis current.
5. The method of controlling the driving apparatus of the permanent magnet synchronous motor according to claim 3, wherein the obtaining of the direct axis voltage and the quadrature axis voltage from the direct axis current, the quadrature axis current, and the three-phase current includes:
after the three-phase current is subjected to second conversion and third conversion, real-time direct axis current and real-time quadrature axis current are obtained;
inputting the real-time direct-axis current and the deviation of the direct-axis current into a first proportional-derivative-integral controller to obtain a direct-axis voltage;
and inputting the deviation between the real-time quadrature axis current and the quadrature axis current into a second proportional-derivative-integral controller to obtain the quadrature axis voltage.
6. The method of controlling the driving apparatus of the permanent magnet synchronous motor according to claim 3, wherein the obtaining of the direct axis current and the quadrature axis current based on the actual rotation speed and the set rotation speed includes:
calculating the deviation between the actual rotating speed and the set rotating speed to obtain the rotating speed deviation;
and inputting the rotating speed deviation into a speed proportional-derivative-integral controller to obtain the direct-axis current and the quadrature-axis current.
7. A drive device control apparatus for a permanent magnet synchronous motor applied to the drive device for a permanent magnet synchronous motor according to claim 1, characterized by comprising:
the acquisition module is used for acquiring the actual rotating speed and the set rotating speed of the permanent magnet synchronous motor and the three-phase current of the three-phase inverter;
the first processing module is used for obtaining direct-axis current and quadrature-axis current according to the actual rotating speed and the set rotating speed;
the second processing module is used for obtaining direct axis voltage and quadrature axis voltage according to the direct axis current, the quadrature axis current and the three-phase current;
the conversion module is used for performing first conversion on the direct-axis voltage and the quadrature-axis voltage and then inputting the converted direct-axis voltage and quadrature-axis voltage to the grid driver so that the grid driver drives the three-phase inverter;
and the flux weakening module is used for increasing the direct-axis current and reducing the quadrature-axis current according to the direct-axis voltage and the quadrature-axis voltage so as to weaken the magnetic field of the permanent magnet synchronous motor and improve the rotating speed of the permanent magnet synchronous motor.
8. The drive device control apparatus of a permanent magnet synchronous motor according to claim 7, wherein the field weakening module includes:
the first operation unit is used for carrying out preset operation on the direct-axis voltage and the quadrature-axis voltage to obtain a first operation result;
the first processing unit is used for inputting the difference between the first operation result and the maximum power supply voltage value of the motor into a preset proportional-derivative controller to obtain current deviation if the first operation result is larger than the maximum power supply voltage value of the motor;
a first updating unit for adding the current deviation to the direct-axis current to update the value of the direct-axis current;
and the second updating unit is used for updating the value of the quadrature-axis current according to the current limit circle rule and the updated direct-axis current.
9. The drive device control device of a permanent magnet synchronous motor according to claim 7, wherein the second processing module includes:
the conversion unit is used for converting the three-phase current into a second conversion and a third conversion to obtain a real-time direct-axis current and a real-time quadrature-axis current;
the second processing unit is used for inputting the real-time direct-axis current and the deviation of the direct-axis current into a first proportional-derivative-integral controller to obtain a direct-axis voltage;
and the third processing unit is used for inputting the deviation between the real-time quadrature axis current and the quadrature axis current into a second proportional-derivative-integral controller to obtain the quadrature axis voltage.
10. The drive device control device of a permanent magnet synchronous motor according to claim 7, wherein the first processing module includes:
the second operation unit is used for calculating the deviation between the actual rotating speed and the set rotating speed to obtain the rotating speed deviation;
and the fourth processing unit is used for inputting the rotating speed deviation into a speed proportional-derivative-integral controller to obtain the direct-axis current and the quadrature-axis current.
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| CN201911142018.4A CN110932638A (en) | 2019-11-20 | 2019-11-20 | Air conditioner, driving device of permanent magnet synchronous motor and control method and device of driving device |
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| CN201911142018.4A CN110932638A (en) | 2019-11-20 | 2019-11-20 | Air conditioner, driving device of permanent magnet synchronous motor and control method and device of driving device |
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