CN111022364A - Constant air volume control method and device for range hood - Google Patents
Constant air volume control method and device for range hood Download PDFInfo
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- CN111022364A CN111022364A CN201911081351.9A CN201911081351A CN111022364A CN 111022364 A CN111022364 A CN 111022364A CN 201911081351 A CN201911081351 A CN 201911081351A CN 111022364 A CN111022364 A CN 111022364A
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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
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
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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
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
- F24C15/00—Details
- F24C15/20—Removing cooking fumes
- F24C15/2021—Arrangement or mounting of control or safety systems
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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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/0003—Control strategies in general, e.g. linear type, e.g. P, PI, PID, using robust control
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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
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
- H02P21/18—Estimation of position or speed
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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
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
- H02P6/18—Circuit arrangements for detecting position without separate position detecting elements
- H02P6/182—Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings
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- Power Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention relates to a method and a device for controlling the constant air volume of a range hood, which are characterized in that: establishing a corresponding relation curve of the air output and the power of the range hood, converting the air output to be output into a success rate, performing power regulation by using a power PI loop and current regulation by using a current PI loop to realize the control of constant air volume, performing coordinate transformation on the sampled back electromotive force current, dividing the converted output signal into three paths, taking one of the output signals as an input signal of an angle estimation unit to estimate an angle, taking the two of the output signals as an input signal of a power calculation unit, and taking the three of the output signals as a feedback input signal of the current PI loop; the output of the power PI ring is used as the current reference input of the current PI ring, and PI regulation is carried out on the output of the power PI ring and the signal after PARK conversion, so that the error of the output of the power PI ring and the signal after PARK conversion is close to 0; and converting the voltage into a PWM duty ratio signal of a motor of the range hood through a linear module SVM to drive the motor of the range hood to operate, so as to form a closed-loop constant air volume control loop. The method has the characteristics of low cost, high reliability and the like.
Description
Technical Field
The invention relates to a constant air volume control method and device for a range hood, and belongs to the technical field of household appliances.
Background
With the acceleration of urbanization process, the range hood becomes a necessary electrical appliance for the kitchen of each city resident, and the range hood has the main functions of rapidly absorbing and discharging gas harmful to human bodies generated in the cooking process to the outside so as to purify the air in the kitchen and ensure the safety of the kitchen.
When the range hood is used, the wind resistance of the air duct is not constant, and if a proper control method is not adopted, the change of the wind resistance can change the numerical value of the air quantity to influence the air draft effect.
At present, a plurality of range hoods all adopt a constant air volume control scheme, and along with the change of air pressure of an air outlet and an air inlet of the range hood or the change of air resistance of an air duct, a motor of the range hood can detect the change and automatically adjust current or adjust the air volume according to a wind pressure sensor.
At present, the constant air volume control method of the range hood used in the market comprises a direct measurement method and an indirect measurement method. The direct measurement method is that a pressure sensor is used for detecting the change of wind pressure at the wind inlet and the wind outlet, and the rotating speed or the current of the motor is adjusted according to the change of the wind pressure; the direct measurement method needs to add a sensor, and has the problems of high cost, low reliability and the like. The indirect measurement method is that the change of the air volume is identified by detecting the change of the running current of the motor, so that the running current or the rotating speed of the motor is adjusted to achieve the constant air volume; the method needs to detect the running current of the motor and needs to arrange a sampling current circuit, and has the problems of complex wiring of a circuit board, high manufacturing cost, low reliability and the like.
Disclosure of Invention
The invention aims to solve the problems of high cost and low reliability of the existing constant air volume control method of the range hood, or complex wiring of a circuit board, high manufacturing cost and low reliability, and provides the constant air volume control method of the range hood. Has the prominent substantive characteristics and remarkable progress of low cost, high reliability and the like.
The second purpose of the invention is to provide a constant air volume control device of a range hood.
One of the purposes of the invention can be achieved by adopting the following technical scheme:
a constant air volume control method for a range hood is characterized by comprising the following steps: establishing a corresponding relation curve of the air output and the power of the range hood, converting the air output to be output into success rate, and utilizing a power PI ring to carry out power regulation and a current PI ring to carry out current regulation to realize the control of constant air volume, wherein the method specifically comprises the following steps:
1) when the range hood is started, the reference power P is determined according to the given air quantity_refThe reference power P_refRegulating output reference current I through power PI loopq_refThen regulating the output reference voltage V through the current PI loopq_refThe reference voltage Vq_refOutputting voltage required by driving a motor of the cigarette machine after coordinate inverse transformation, enabling the motor of the cigarette machine to operate in an open loop mode, and sampling the counter electromotive force current when the rotating speed of the motor of the cigarette machine reaches the current which can be sampled by an AD module of the MCU; the power PI ring is provided with a power PI adjusting structure, and the current PI ring is provided with a current PI adjusting structure; the coordinate transformation comprises CLARK transformation and PARK transformation, and the coordinate inverse transformation comprises CLARK inverse transformation and PARK inverse transformation;
2) carrying out coordinate transformation on the sampled back electromotive force current, dividing the transformed output signals into three paths, taking one of the output signals as an input signal of an angle estimation unit to estimate an angle, outputting an angle value of a rotor position signal theta by the angle estimation unit, and taking the angle value as each path of input signal of coordinate inverse transformation and coordinate transformation; the second output signal is used as the input signal of the power calculation unit, and the output signal of the power calculation unit is used as the feedback input signal P of the power PI loop_fb(ii) a The third output signal is used as the feedback input signal I of the current PI loopq_fb；
3) Determining reference power P for given air quantity_refReference power P as power PI loop_refPower reference input, and P calculated by the power calculation unit_fbPerforming PI regulation and outputting Iq_refAs a current reference input to a current PI loop;
4) output of power PI loop Iq_refAs current reference input to the current PI loop, with PARK-converted Iq_fbPerforming PI regulation so that Iq_fbAnd Iq_refError of (2) is close to 0;
5) output V of current PI loopq_refEntering an inverse transformation module and converting the voltage into voltage required by a driving motor;
6) the voltage is converted into a PWM duty ratio signal of each phase of the motor of the range hood through a linear module SVM to drive the motor of the range hood to operate, and a closed-loop constant air volume control loop is formed to control the air volume of the range hood to be constant.
One of the purposes of the invention can be achieved by adopting the following technical scheme:
further, the output quantity after the point 2) transformation is divided into electromotive voltage Vd_fbCounter electromotive voltage Vq_fbCounter electromotive force current Iq_fbElectromotive force current Id_fbAnd the output of the angle estimation is an estimated rotor position signal theta, and the angle value of the rotor position signal theta is used as a path of input signals of coordinate inverse transformation and coordinate transformation.
Further, reference power P of point 3) power PI loop_refThe reference power P of the power PI ring is obtained by calculation according to a corresponding relation unit LUT of the air volume and the power_refThe corresponding relation unit LUT of the air volume and the power searches the corresponding relation curve of the air volume and the power to obtain the corresponding reference power P of the reference work corresponding to the given air volume_refAnd storing the data into a FLASH memory chip of the MCU.
The second purpose of the invention can be achieved by adopting the following technical scheme:
the utility model provides a cigarette machine constant air volume controlling means which structural feature lies in: the system comprises a power PI ring, a current PI ring, a coordinate transformation unit, a coordinate inverse transformation unit, an angle estimation unit, a power calculation unit, a linear module SVM and a motor detection unit, wherein the power PI ring is provided with a reference power input end for inputting reference power for driving the starting of a motor of the range hood, the output end of the power PI ring is connected with the reference signal input end of the current PI ring, the output end of the current PI ring is connected with the reference signal input end of the coordinate inverse transformation unit, and the output end of the coordinate inverse transformation unit is connected with the control input end of the motor of the range hood through the linear module SVM to form an input control loop; the detection input end of the motor detection unit is electrically connected with a motor rotating shaft, the signal output end of the motor detection unit is connected with the signal input end of the coordinate transformation unit, the output end of the coordinate transformation unit is divided into three paths, one of the output ends of the coordinate transformation unit is connected with the input end of the angle estimation unit, the output end of the angle estimation unit is connected with the feedback input end of the coordinate inverse transformation unit, the output end of the angle estimation unit; the third output end is connected with a feedback input signal input end of the current PI loop; forming a feedback control loop.
The second purpose of the invention can be achieved by adopting the following technical scheme:
furthermore, the power PI ring has a power PI regulation structure and is composed of a conventional power PI regulation circuit; the current PI ring is provided with a current PI adjusting structure and is composed of a conventional current PI adjusting circuit; the coordinate transformation unit is formed by connecting a conventional CLARK transformation circuit and a conventional PARK transformation circuit in series, and the coordinate inverse transformation is formed by connecting a conventional CLARK inverse transformation circuit and a conventional PARK inverse transformation circuit in series.
Further, the power calculating unit is composed of a conventional power calculating circuit, the angle estimating unit is composed of a conventional angle calculator, and the linear module SVM is composed of a signal generating circuit structure with a conventional PWM duty ratio; the motor detection unit is composed of a conventional motor counter electromotive force current signal detection circuit, and comprises a single chip microcomputer MCU, a storage FLASH and a current sensor.
The invention has the following prominent substantive characteristics and remarkable technical progress:
1. the invention relates to a method for controlling the constant air volume of a cigarette machine, which converts the air volume to be output into success rate by establishing a corresponding relation curve of the air volume and power of the cigarette machine, utilizes a power PI ring to regulate power and a current PI ring to regulate current, and realizes the control of the constant air volume, and specifically comprises the following steps: when the smoke machine is started, sampling the counter electromotive force current, and carrying out coordinate transformation on the sampled counter electromotive force current; giving air volume to determine reference power as reference power reference input of a power PI ring, carrying out PI regulation on the reference power and output power calculated by a power calculation unit, and outputting the reference power as current reference input of a current PI ring; the output of the power PI ring is used as the current reference input of the current PI ring, and PI regulation is carried out on the output current after PARK conversion, so that the error of the output current and the output current is close to 0; the output voltage of the current PI ring enters an inverse transformation module and is converted into the voltage required by the driving motor; converting the voltage into a PWM duty ratio signal of each phase of a motor of the range hood through a linear module SVM to drive the motor of the range hood to operate, and forming a closed-loop constant air volume control loop to control the air volume of the range hood to be constant; therefore, the method can solve the problems of high cost, low reliability, complex circuit board wiring and low system reliability of the existing method for controlling the constant air volume of the range hood, and has the prominent substantive characteristics and obvious progress of low cost and high reliability compared with a direct measurement method, simple circuit structure compared with an indirect measurement method, low manufacturing cost, high reliability and the like.
2. The invention relates to a constant air volume control device of a smoke machine, which comprises a power PI ring, a current PI ring, a coordinate transformation unit, a coordinate inverse transformation unit, an angle estimation unit, a power calculation unit, a linear module SVM and a motor detection unit, wherein the power PI ring is provided with a reference power input end for inputting reference power for driving the starting of a smoke machine motor, the output end of the power PI ring is connected with the reference signal input end of the current PI ring, the output end of the current PI ring is connected with the reference signal input end of the coordinate inverse transformation unit, and the output end of the coordinate inverse transformation unit is connected with the control input end of the smoke machine motor through the linear module SVM to form an input control loop; the detection input end of the motor detection unit is electrically connected with a motor rotating shaft, the signal output end of the motor detection unit is connected with the signal input end of the coordinate transformation unit, the output end of the coordinate transformation unit is divided into three paths, one of the output ends of the coordinate transformation unit is connected with the input end of the angle estimation unit, the output end of the angle estimation unit is connected with the feedback input end of the coordinate inverse transformation unit, the output end of the angle estimation unit; the third output end is connected with a feedback input signal input end of the current PI loop; forming a feedback control loop; therefore, the problems of high cost and low reliability or complex circuit board wiring and low system reliability of the existing constant air volume control method of the range hood can be solved, and the method has prominent substantive characteristics and remarkable progress of low cost, high reliability and the like.
3. The invention realizes the control of the constant power of the cigarette machine only by the calculation of internal parameters on the basis of not adding additional devices. The cost of the whole cigarette machine system is reduced, and the reliability of the system is improved.
Drawings
FIG. 1 is a flow chart of a method of implementing an embodiment of the present invention.
Fig. 2 is a graph of air volume versus power in accordance with an embodiment of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
Detailed description of the preferred embodiment 1
Referring to fig. 1 to 2, the method for controlling the constant air volume of the range hood according to the present embodiment is characterized in that: establishing a corresponding relation curve of the air output and the power of the range hood, converting the air output to be output into success rate, and utilizing a power PI ring to carry out power regulation and a current PI ring to carry out current regulation to realize the control of constant air volume, wherein the method specifically comprises the following steps:
1) when the range hood is started, the reference power P is determined according to the given air quantity_refThe reference power P_refRegulating output reference current I through power PI loopq_refThen regulating the output reference voltage V through the current PI loopq_refThe reference voltage Vq_refOutputting voltage required by driving a motor of the cigarette machine after coordinate inverse transformation, enabling the motor of the cigarette machine to operate in an open loop mode, and sampling the counter electromotive force current when the rotating speed of the motor of the cigarette machine reaches the current which can be sampled by an AD module of the MCU; the power PI ring is provided with a power PI adjusting structure, and the current PI ring is provided with a current PI adjusting structure; the coordinate transformation packageThe coordinate inverse transformation comprises CLARK inverse transformation and PARK inverse transformation;
2) carrying out coordinate transformation on the sampled back electromotive force current, dividing the transformed output signals into three paths, taking one of the output signals as an input signal of an angle estimation unit to estimate an angle, outputting an angle value of a rotor position signal theta by the angle estimation unit, and taking the angle value as each path of input signal of coordinate inverse transformation and coordinate transformation; the second output signal is used as the input signal of the power calculation unit, and the output signal of the power calculation unit is used as the feedback input signal P of the power PI loop_fb(ii) a The third output signal is used as the feedback input signal I of the current PI loopq_fb；
3) Determining reference power P for given air quantity_refReference power P as power PI loop_refPower reference input, and P calculated by the power calculation unit_fbPerforming PI regulation and outputting Iq_refAs a current reference input to a current PI loop;
4) output of power PI loop Iq_refAs current reference input to the current PI loop, with PARK-converted Iq_fbPerforming PI regulation so that Iq_fbAnd Iq_refError of (2) is close to 0;
5) output V of current PI loopq_refEntering an inverse transformation module and converting the voltage into voltage required by a driving motor;
6) the voltage is converted into a PWM duty ratio signal of each phase of the motor of the range hood through a linear module SVM to drive the motor of the range hood to operate, and a closed-loop constant air volume control loop is formed to control the air volume of the range hood to be constant.
In this embodiment:
output quantity after point transformation of 2) is divided into electromotive voltage Vd_fbCounter electromotive voltage Vq_fbCounter electromotive force current Iq_fbElectromotive force current Id_fbAnd the output of the angle estimation is an estimated rotor position signal theta, and the angle value of the rotor position signal theta is used as a path of input signals of coordinate inverse transformation and coordinate transformation.
Point 3) ofReference power P of power PI loop_refThe reference power P of the power PI ring is obtained by calculation according to a corresponding relation unit LUT of the air volume and the power_refThe corresponding relation unit LUT of the air volume and the power searches the corresponding relation curve of the air volume and the power to obtain the corresponding reference power P of the reference work corresponding to the given air volume_refAnd storing the data into a FLASH memory chip of the MCU.
The constant air volume control device of the range hood related to the embodiment comprises a power PI ring, a current PI ring, a coordinate transformation unit, a coordinate inverse transformation unit, an angle estimation unit, a power calculation unit, a linear module SVM and a motor detection unit, wherein the power PI ring is provided with a reference power input end for inputting reference power for driving the start of a motor of the range hood, the output end of the power PI ring is connected with the reference signal input end of the current PI ring, the output end of the current PI ring is connected with the reference signal input end of the coordinate inverse transformation unit, and the output end of the coordinate inverse transformation unit is connected with the control input end of the motor of the range hood through the linear module SVM to form an input control loop; the detection input end of the motor detection unit is electrically connected with a motor rotating shaft, the signal output end of the motor detection unit is connected with the signal input end of the coordinate transformation unit, the output end of the coordinate transformation unit is divided into three paths, one of the output ends of the coordinate transformation unit is connected with the input end of the angle estimation unit, the output end of the angle estimation unit is connected with the feedback input end of the coordinate inverse transformation unit, the output end of the angle estimation unit; the third output end is connected with a feedback input signal input end of the current PI loop; forming a feedback control loop.
In this embodiment:
the power PI ring is provided with a power PI adjusting structure and is composed of a conventional power PI adjusting circuit; the current PI ring is provided with a current PI adjusting structure and is composed of a conventional current PI adjusting circuit; the coordinate transformation unit is formed by connecting a conventional CLARK transformation circuit and a conventional PARK transformation circuit in series, and the coordinate inverse transformation is formed by connecting a conventional CLARK inverse transformation circuit and a conventional PARK inverse transformation circuit in series.
The power calculation unit is composed of a conventional power calculation circuit, the angle estimation unit is composed of a conventional angle calculator, and the linear module SVM is composed of a signal generation circuit structure with a conventional PWM duty ratio; the motor detection unit is composed of a conventional motor counter electromotive force current signal detection circuit, and comprises a single chip microcomputer MCU, a storage FLASH and a current sensor.
The control principle of the embodiment is as follows:
if, the motor is required to give an air volume of 8m3H, calculating the corresponding power value according to the corresponding relation (shown in figure 2) between the air volume and the power, wherein the corresponding power value is the reference input power P of the power PI ring_refThe power value is compared with a feedback power value P calculated during the operation of the motor_fbAnd performing PI adjustment to enable the numerical values of the two to be equal. If the calculated feedback power P_fbGreater than P_refThe output current I of the power PI loopq_refThe output through the current PI loop is reduced, so that the driving signal of the driving motor is reduced, the rotating speed of the motor is reduced, the current of the counter electromotive force is reduced, and the feedback power P calculated after conversion is reduced_fbAlso becomes smaller, after a plurality of adjustments, P is enabled_fbAnd P_refAre equal.
The key to the implementation of the embodiment is to determine the relationship between the air volume and the power (shown in fig. 2) related in the LUT block diagram in advance, and test the relationship between the air volume and the power (shown in fig. 2) of the range hood under different windage resistances in advance. The correspondence is fitted to a curve (shown in fig. 2) using a polynomial. In the graph of the air volume versus power shown in fig. 2, the abscissa represents power (unit: watt), and the ordinate represents the air volume (unit: cubic/hour). In practical application, according to the required air volume, the required power is calculated through a pre-fitted curve, the actual operation power of the motor is calculated through the motor phase current feedback signal shown in fig. 1, PID adjustment is performed on the power calculated through fitting, the power of the motor and the power calculated through fitting are equal, and therefore constant air volume control is achieved. Fig. 2 is a graph of the relationship between the air volume and the power, and the data on the graph is the data quantized by the unit.
The power calculation is obtained by calculating the running power Pow of the motor Id Ud and Iq Uq according to the voltage and the current of the DQ shaft after coordinate transformation in the FOC algorithm, and all variables are subjected to scaling treatment in the calculation process, wherein: pow is cigarette machine motor operating power, Id is cigarette machine motor electromotive force electric current, Ud is cigarette machine motor electromotive force voltage, Iq is cigarette machine motor electromotive force electric current, Uq is cigarette machine motor electromotive force voltage.
Output quantity electromotive voltage V after coordinate transformation (including CLARK transformation and PARK transformation)d_fbCounter electromotive voltage Vq_fbCounter electromotive force current Iq_fbElectromotive force current Id_fbThe power is input to a power calculation module for calculation, and a calculation expression P is equal to Id_fb*Vd_fb+Iq_fb*Vq_fbThe output of the power module serves as the input to the power outer loop.
The embodiment realizes the constant air volume control of the range hood by a simple and easy-to-operate method under the condition of not increasing the cost and the complexity of the system. And calculating the reference power of the power PI ring according to the corresponding relation between the air volume and the power, wherein the corresponding relation curve between the air volume and the power needs to be measured in advance, is calibrated and is stored in the FLASH of the MCU.
Output voltage V of current PI loopq_refEntering a coordinate inverse transformation unit, and converting the coordinate inverse transformation unit into a voltage required by a driving motor; the linear module SVM converts the voltage into PWM duty ratio signals of each phase of the motor to drive the motor to run.
Through the steps, the motor can operate according to the given air quantity, and the aim of constant air quantity is achieved.
Claims (6)
1. A constant air volume control method for a range hood is characterized by comprising the following steps: establishing a corresponding relation curve of the air output and the power of the range hood, converting the air output to be output into success rate, and utilizing a power PI ring to carry out power regulation and a current PI ring to carry out current regulation to realize the control of constant air volume, wherein the method specifically comprises the following steps:
1) when a cigarette machine is started, determining reference power according to given air volume, regulating the reference power to output reference current through a power PI ring, regulating the reference voltage through a current PI ring, performing coordinate inverse transformation on the reference voltage, outputting voltage required by driving a motor of the cigarette machine, enabling the motor of the cigarette machine to operate in an open loop mode, and sampling counter electromotive force current when the rotating speed of the motor of the cigarette machine reaches the current which can be used for sampling counter electromotive force by an AD module of an MCU (microprogrammed control unit); the power PI ring is provided with a power PI adjusting structure, and the current PI ring is provided with a current PI adjusting structure; the coordinate transformation comprises CLARK transformation and PARK transformation, and the coordinate inverse transformation comprises CLARK inverse transformation and PARK inverse transformation;
2) carrying out coordinate transformation on the sampled back electromotive force current, dividing the transformed output signals into three paths, taking one of the output signals as an input signal of an angle estimation unit to estimate an angle, outputting an angle value of a rotor position signal theta by the angle estimation unit, and taking the angle value as each path of input signal of coordinate inverse transformation and coordinate transformation; the second output signal is used as an input signal of the power calculation unit, and the output signal of the power calculation unit is used as a feedback input signal of the power PI loop; the third output signal is used as a feedback input signal of the current PI loop;
3) determining reference power through given air volume, wherein the reference power is input as a reference power end of a power PI ring, PI regulation is carried out on the reference power and the output power calculated by a power calculation unit, and an output current signal is used as current reference input of a current PI ring;
4) the output current signal of the power PI ring is used as the current reference input of the current PI ring, and PI regulation is carried out on the output current signal and the current signal after PARK conversion, so that the error of the output current signal and the current signal is close to 0;
5) an output voltage signal of the current PI ring enters an inverse transformation module and is converted into a voltage required by a driving motor;
6) the voltage is converted into a PWM duty ratio signal of each phase of the motor of the range hood through a linear module SVM to drive the motor of the range hood to operate, and a closed-loop constant air volume control loop is formed to control the air volume of the range hood to be constant.
2. The constant air volume control method of the range hood according to claim 1, characterized in that: output quantity after point transformation of 2) is divided into electromotive voltage Vd_fbCounter electromotive voltage Vq_fbCounter electromotive force current Iq_fbElectromotive force current Id_fbAnd the output of the angle estimation is an estimated rotor position signal theta, and the angle value of the rotor position signal theta is used as a path of input signals of coordinate inverse transformation and coordinate transformation.
3. The constant air volume control method of the range hood according to claim 1, characterized in that: reference power P of point power PI loop of 3)_refThe reference power P of the power PI ring is obtained by calculation according to a corresponding relation unit LUT of the air volume and the power_refThe corresponding relation unit LUT of the air volume and the power searches the corresponding relation curve of the air volume and the power to obtain the corresponding reference power P of the reference work corresponding to the given air volume_refAnd storing the data into a FLASH memory chip of the MCU.
4. The constant air volume control device of the range hood is characterized in that: the system comprises a power PI ring, a current PI ring, a coordinate transformation unit, a coordinate inverse transformation unit, an angle estimation unit, a power calculation unit, a linear module SVM and a motor detection unit, wherein the power PI ring is provided with a reference power input end for inputting reference power for driving the starting of a motor of the range hood, the output end of the power PI ring is connected with the reference signal input end of the current PI ring, the output end of the current PI ring is connected with the reference signal input end of the coordinate inverse transformation unit, and the output end of the coordinate inverse transformation unit is connected with the control input end of the motor of the range hood through the linear module SVM to form an input control loop; the detection input end of the motor detection unit is electrically connected with a motor rotating shaft, the signal output end of the motor detection unit is connected with the signal input end of the coordinate transformation unit, the output end of the coordinate transformation unit is divided into three paths, one of the output ends of the coordinate transformation unit is connected with the input end of the angle estimation unit, the output end of the angle estimation unit is connected with the feedback input end of the coordinate inverse transformation unit, the output end of the angle estimation unit; the third output end is connected with a feedback input signal input end of the current PI loop; forming a feedback control loop.
5. The constant air volume control device of the range hood according to claim 4, characterized in that: the power PI ring is provided with a power PI adjusting structure and is composed of a conventional power PI adjusting circuit; the current PI ring is provided with a current PI adjusting structure and is composed of a conventional current PI adjusting circuit; the coordinate transformation unit is formed by connecting a conventional CLARK transformation circuit and a conventional PARK transformation circuit in series, and the coordinate inverse transformation is formed by connecting a conventional CLARK inverse transformation circuit and a conventional PARK inverse transformation circuit in series.
6. The constant air volume control device of the range hood according to claim 4, characterized in that: the power calculation unit is composed of a conventional power calculation circuit, the angle estimation unit is composed of a conventional angle calculator, and the linear module SVM is composed of a signal generation circuit structure with a conventional PWM duty ratio; the motor detection unit is composed of a conventional motor counter electromotive force current signal detection circuit, and comprises a single chip microcomputer MCU, a storage FLASH and a current sensor.
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| CN201911081351.9A CN111022364B (en) | 2019-11-07 | 2019-11-07 | Constant air volume control method and device for range hood |
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| CN201911081351.9A CN111022364B (en) | 2019-11-07 | 2019-11-07 | Constant air volume control method and device for range hood |
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| WO2023093341A1 (en) * | 2021-11-26 | 2023-06-01 | 江苏科技大学 | High-speed permanent magnet synchronous motor control method based on power loop |
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