CN112032916B - Motor control system and air conditioner - Google Patents
Motor control system and air conditioner Download PDFInfo
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- CN112032916B CN112032916B CN202010859619.3A CN202010859619A CN112032916B CN 112032916 B CN112032916 B CN 112032916B CN 202010859619 A CN202010859619 A CN 202010859619A CN 112032916 B CN112032916 B CN 112032916B
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- motor
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- rotating speed
- output voltage
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- 238000004364 calculation method Methods 0.000 description 9
- 238000001514 detection method Methods 0.000 description 3
- 238000009423 ventilation Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000004973 liquid crystal related substance Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Images
Classifications
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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
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/56—Remote control
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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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
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/81—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the air supply to heat-exchangers or bypass channels
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/30—Velocity
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Air Conditioning Control Device (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a motor control system and an air conditioner, comprising: the motor control system comprises a voltage output module for outputting voltage to the motor according to preset output voltage, a voltage feedback module for detecting the output voltage, a rotating speed feedback module for acquiring the actual rotating speed of the motor, and a controller for correcting the preset output voltage according to the deviation between the output voltage and the preset output voltage and the deviation between the actual rotating speed of the motor and the preset motor rotating speed. The invention can correct the preset voltage according to the deviation of the actual output voltage and the preset output voltage and the actual rotating speed of the motor and the preset rotating speed of the motor, and correct the rotating speed of the motor through the wind speed of the air outlet, thereby forming multi-stage feedback to correct the rotating speed deviation of the motor, enabling the temperature regulation to be more accurate, and avoiding the deviation of the rotating speed of the motor caused by the deviation of the output voltage due to the influence of factors such as power grid fluctuation and the like, and finally causing the deviation of the temperature regulation.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a motor control system and an air conditioner.
Background
The existing stepless speed regulation temperature controller realizes stepless speed regulation of the whole rotating speed range of the brushless direct current motor on the basis of multi-gear wind speed, but actually, parameters needing to be calibrated and corrected exist in each stage of the temperature regulation process, for example, the output voltage value has deviation, the change of the rotating speed of the motor is directly influenced, and further the wind speed is influenced, so that the deviation exists in the temperature regulation; the influence of the wind resistance of the air outlet of the motor on the wind speed and the wind quantity can also cause the deviation of temperature regulation.
Disclosure of Invention
The invention provides a motor control system and an air conditioner, aiming at solving the technical problem that the rotating speed of a motor of the air conditioner in the prior art is deviated.
The technical scheme adopted by the invention is as follows:
the invention provides a motor control system, comprising: the motor control system comprises a voltage output module for outputting voltage to the motor according to preset output voltage, a voltage feedback module for detecting the output voltage, a rotating speed feedback module for acquiring the actual rotating speed of the motor, and a controller for correcting the preset output voltage according to the deviation between the output voltage and the preset output voltage and the deviation between the actual rotating speed of the motor and the preset motor rotating speed.
The invention also comprises a temperature detection module for collecting the indoor temperature, and the controller adjusts the preset output voltage of the voltage output module according to the temperature difference between the indoor temperature and the set temperature.
The step of correcting the preset output voltage by the controller specifically comprises the following steps:
calculating a voltage difference value between a preset output voltage and an output voltage, and correcting the preset output voltage into a first correction voltage, wherein the first correction voltage is the sum of the preset output voltage and the voltage difference value;
calculating a rotating speed deviation value of the preset rotating speed and the actual rotating speed of the motor, acquiring a compensation voltage corresponding to the rotating speed deviation value, and correcting the preset output voltage into a second correction voltage, wherein the second correction voltage is the sum of the first correction voltage and the compensation voltage.
The invention also includes: the controller also corrects the preset rotating speed of the motor according to the wind speed of the air outlet.
Correcting the preset rotational speed of the motor includes: the controller calculates the actual air volume through the air speed of the air outlet, calculates the compensation proportion of the air volume according to the deviation of the actual air volume and the preset air volume, and corrects the preset rotating speed according to the compensation proportion.
And further, acquiring the compensation voltage corresponding to the rotation speed deviation value from a linear proportion comparison table of the preset rotation speed deviation and the compensation voltage.
The calculation formula of the actual air volume is L = 3600F V, L is the actual air volume, F is the ventilation area of the air inlet, and V is the air speed of the air outlet.
The calculation formula of the compensation proportion is as follows: a = (L-L0)/L0, wherein a is a compensation proportion, L is an actual air volume, and L0 is a preset air volume.
Preferably, the motor is a brushless dc motor.
The invention further provides an air conditioner which comprises the motor and the motor control system.
Compared with the prior art, the invention can correct the preset voltage according to the actual output voltage and the preset output voltage and the deviation between the actual rotating speed of the motor and the preset motor rotating speed, and correct the motor rotating speed through the wind speed of the air outlet, thereby forming multi-stage feedback to correct the rotating speed deviation of the motor, enabling the temperature regulation to be more accurate, and avoiding the deviation of the motor rotating speed caused by the deviation of the output voltage due to the influence of factors such as power grid fluctuation and the like, and finally causing the deviation of the temperature regulation.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
FIG. 1 is a block diagram of a system in an embodiment of the invention;
FIG. 2 is a control diagram of an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The principles and construction of the present invention will be described in detail below with reference to the drawings and examples.
As shown in fig. 1 and fig. 2, the present invention provides a motor control system, which is applied to an air conditioner and mainly controls the rotation speed of a fan motor of an indoor unit of the air conditioner by changing voltage, wherein the motor is a brushless dc motor, and the rotation speed of the motor changes along with the change of an actual output voltage. The method specifically comprises the following steps: the device comprises a temperature detection module, a voltage output module, a voltage feedback module, a rotating speed feedback module and a controller.
The temperature detection module is used for acquiring indoor temperature T1, the indoor temperature T1 and the set temperature T0 are compared through the controller to calculate an output temperature difference value delta T, the controller sets the preset output voltage of the voltage output module according to the output temperature difference value delta T, the preset output voltage can be adjusted according to the change of the output temperature difference value delta T, the voltage feedback module can detect the actual output voltage of the voltage output module and send voltage data to the controller, and the rotating speed feedback module can calculate the actual rotating speed of the motor according to a pulse signal fed back by the motor. The controller can correct the preset voltage according to the actual output voltage and the preset output voltage and the deviation between the actual rotating speed of the motor and the rotating speed of the preset motor, so that the rotating speed deviation of the motor is corrected, and the temperature is adjusted more accurately.
In a specific embodiment, the step of modifying the preset voltage by the controller specifically includes:
calculating a voltage difference value between the preset output voltage and the output voltage, and correcting the preset voltage into a first corrected voltage which is the sum of the preset voltage and the voltage difference value;
and calculating a rotating speed deviation value of the preset rotating speed and the actual rotating speed of the motor, acquiring a compensation voltage corresponding to the rotating speed deviation value, and correcting the preset voltage into a second correction voltage, wherein the second correction voltage is the sum of the first correction voltage and the compensation voltage.
The invention also comprises a wind speed feedback module, the wind speed feedback module can detect the wind speed of the air outlet of the air conditioner, the controller can correct the preset rotating speed of the motor according to the wind speed of the air outlet, and the correcting of the preset rotating speed of the motor specifically comprises the following steps: the controller calculates the actual air volume through the air outlet air speed, calculates the compensation proportion of the air volume according to the deviation of the actual air volume and the preset air volume, and corrects the preset rotating speed according to the compensation proportion.
The specific calculation mode for correcting the preset rotating speed of the motor is as follows: the calculation formula of the actual air volume is L = 3600F V, L is the actual air volume, F is the ventilation area of the air inlet, and V is the air speed of the air outlet. The calculation mode of the compensation proportion is as follows: firstly, an air volume difference value delta L obtained by subtracting a preset air volume L0 from an actual air volume L is obtained, and the compensation proportion is a =deltaL/L0. The specific calculation method for correcting the preset rotation speed N0 at the compensation ratio is (a + 1) N0.
The motor control system provided by the invention further comprises: the device comprises a liquid crystal display module, an infrared remote control module and a communication module. The controller controls the voltage output module in a PWM/DAC mode, and the liquid crystal display module, the infrared remote control module and the communication module are commonly used technologies and are not described in detail.
The invention further provides an air conditioner which comprises the motor and the motor control system.
The following are specific examples:
1. required air volume L (that is, preset air volume) of current environment is 3000 m/h for cultivation, and preset rotating speed N0 of fan is 2000 rpm. And after reaching the lowest rotation speed (starting voltage), the rotation speed N is in direct proportion to the voltage U.
The corresponding preset output voltage of the current preset rotating speed is 5.03V, the actual output voltage of the voltage output module is supposed to be 4.4V, the value is fed back to the controller, the controller increases the theoretical calculation value according to the feedback value and adjusts the theoretical calculation value to 5.66V, and the output voltage value is 5.03V.
2. The currently set rotating speed value is 2000rpm, the feedback value of the actual rotating speed of the motor is 1690 rpm, the value is fed back to the controller, and the theoretical calculation value is increased by the controller according to the feedback value. In connection with the above first point, the actual output voltage of 5.03V, corresponding to 1998 rpm, i.e. about 2000rpm, is still deviated from the actual feedback value 1690 rpm, and a correction parameter is needed. At the voltage of 5.03V, the rotating speed is 308rpm and needs to be compensated, and the voltage needs to be compensated by 0.85V according to the linear proportion of the rotating speed and the voltage, so that the control voltage value is adjusted to be 5.66V +0.85V =6.51V in combination with the first point condition.
3. The air quantity is calculated by an L = 3600F V (in the formula, F is the ventilation area m2 of the air inlet, V is the measured average air speed (m/s) of the air inlet), and the air quantity is in direct proportion to the air speed which is in direct proportion to the rotating speed of the motor, so that the parameters can be corrected in real time by measuring the actual air speed of the air inlet and feeding the value back to the controller. In the second point, after the voltage value is adjusted to 6.51V, 2940 mn/h is calculated according to the measured actual wind speed at the wind outlet, and there is a deviation from the preset 3000 mn/h, so that the current wind speed needs to be compensated by 2%, at this time, the rotation speed setting value needs to be compensated by 2% synchronously, that is, the rotation speed setting value of the motor is revised to 2040 rpm, and then the next round of parameter correction is performed.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A motor control system comprising: according to predetermine output voltage to the voltage output module of motor output voltage, its characterized in that still includes: the controller comprises a voltage feedback module for detecting output voltage, a rotating speed feedback module for acquiring the actual rotating speed of the motor, and a controller for correcting the preset output voltage according to the deviation between the output voltage and the preset output voltage as well as the deviation between the actual rotating speed of the motor and the preset motor rotating speed;
the controller modifying the preset output voltage comprises: calculating a voltage difference value between a preset output voltage and an output voltage, and correcting the preset output voltage into a first correction voltage, wherein the first correction voltage is the sum of the preset output voltage and the voltage difference value;
calculating a rotating speed deviation value of the preset rotating speed and the actual rotating speed of the motor, acquiring a compensation voltage corresponding to the rotating speed deviation value, and correcting the preset output voltage into a second correction voltage, wherein the second correction voltage is the sum of the first correction voltage and the compensation voltage.
2. The motor control system of claim 1, further comprising a temperature sensing module for sensing an indoor temperature, wherein the controller adjusts the preset output voltage of the voltage output module according to a temperature difference between the indoor temperature and the set temperature.
3. The motor control system of claim 1, further comprising: the controller also corrects the preset rotating speed of the motor according to the wind speed of the air outlet.
4. The motor control system of claim 3, wherein the correcting the preset rotation speed of the motor according to the wind speed at the wind outlet comprises: the controller calculates actual air volume by acquiring air speed of the air outlet, calculates a compensation proportion of the air volume according to the deviation of the actual air volume and the preset air volume, and compensates and corrects the preset rotating speed according to the compensation proportion.
5. The motor control system of claim 1, wherein the compensation voltage corresponding to the deviation value is obtained from a linear scale table of the preset deviation of the rotation speed and the compensation voltage.
6. The motor control system of claim 4, wherein the actual air volume is calculated as L = 3600F V, L is the actual air volume, F is the vent area of the air opening, and V is the air velocity of the air outlet.
7. The motor control system of claim 6, wherein the compensation ratio is calculated by: a = (L-L0)/L0, wherein a is a compensation proportion, L is an actual air volume, and L0 is a preset air volume.
8. The motor control system of claim 1 wherein said motor is a brushless dc motor.
9. An air conditioner comprising a motor, characterized by further comprising the motor control system of any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010859619.3A CN112032916B (en) | 2020-08-24 | 2020-08-24 | Motor control system and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010859619.3A CN112032916B (en) | 2020-08-24 | 2020-08-24 | Motor control system and air conditioner |
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| CN112032916A CN112032916A (en) | 2020-12-04 |
| CN112032916B true CN112032916B (en) | 2021-05-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112682845A (en) * | 2020-12-28 | 2021-04-20 | 青岛海信日立空调系统有限公司 | Air conditioner and automatic air volume compensation control method thereof |
| CN113103534B (en) * | 2021-02-25 | 2022-08-30 | 海天塑机集团有限公司 | Self-adjusting method and system for hydraulic turntable of injection molding machine |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP3868945B2 (en) * | 2003-09-30 | 2007-01-17 | エイジア ヴァイタル コンポーネンツ カンパニー リミテッド | Motor drive system |
| TWI279071B (en) * | 2006-01-03 | 2007-04-11 | Delta Electronics Inc | Fan system and control device thereof |
| CN104373368B (en) * | 2014-11-12 | 2017-05-24 | 合肥美的电冰箱有限公司 | Draught fan rotating speed control method and device for refrigerator and refrigerator |
| CN105262408B (en) * | 2015-11-23 | 2017-11-17 | 珠海格力电器股份有限公司 | Motor control method and system |
| CN105674520A (en) * | 2016-01-21 | 2016-06-15 | 珠海格力电器股份有限公司 | Constant air volume control method and device |
| CN107681949A (en) * | 2017-11-18 | 2018-02-09 | 四川长江液压天成机械有限公司 | A kind of motor control method |
| CN111089406A (en) * | 2019-12-04 | 2020-05-01 | 珠海格力电器股份有限公司 | Fan coil air-out control method and device, controller and air conditioning unit |
| CN111140527A (en) * | 2019-12-23 | 2020-05-12 | 华帝股份有限公司 | Control method and control system for stable operation of fan |
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