CN114204851A - Motor soft starting method of air conditioner - Google Patents
Motor soft starting method of air conditioner Download PDFInfo
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- CN114204851A CN114204851A CN202111392950.XA CN202111392950A CN114204851A CN 114204851 A CN114204851 A CN 114204851A CN 202111392950 A CN202111392950 A CN 202111392950A CN 114204851 A CN114204851 A CN 114204851A
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- motor
- duty ratio
- rotating speed
- air conditioner
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 238000004378 air conditioning Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
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Classifications
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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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
-
- 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
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/18—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual dc motor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
Abstract
The invention discloses a motor soft start method of an air conditioner, which comprises the following steps: starting the brake motor and operating at an initial duty ratio P1; continuously receiving the current rotating speed of the motor, counting the received times of the current rotating speed of the motor, and adjusting the current duty ratio according to the received times of the current rotating speed of the motor so as to adjust the current rotating speed of the motor in real time; and when the received current rotating speed number of the motor reaches a preset feedback number n, adjusting the motor to operate at a target duty ratio P0 according to a PID algorithm so as to enable the current rotating speed of the motor to reach a target rotating speed. The soft starting method of the motor of the air conditioner provided by the embodiment of the invention has the advantages of stable motor rotating speed adjustment, comfortable user experience and the like.
Description
Technical Field
The invention relates to the technical field of air conditioning equipment, in particular to a motor soft start method of an air conditioner.
Background
In the air conditioner in the related art, when a motor of an indoor unit is just started, a fixed initial duty ratio is forcibly output, and in order to drive a load by the motor, the initial duty ratio is often set to a small value to obtain a large output voltage. And after a larger duty ratio with a fixed value is forcibly output again, the current motor rotating speed is brought into the PID algorithm, and the subsequent duty ratio is adjusted at certain time intervals according to the PID algorithm. However, when the duty ratio is adjusted according to the PID algorithm, the motor of the air conditioner is not adjusted to a stable rotation speed, so that the duty ratio adjusted according to the PID algorithm is also inaccurate, and the rotation speed of the motor fluctuates greatly. Especially, when the defrosting is carried out automatically, a large amount of fog is blown out, which may cause poor user experience.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the motor soft start method of the air conditioner, and the motor soft start method of the air conditioner has the advantages of stable motor rotation speed adjustment, comfortable user experience and the like.
In order to achieve the above object, an embodiment of the present invention provides a method for soft starting a motor of an air conditioner, including: controlling the motor to start and operate at an initial duty ratio P1; continuously receiving the current rotating speed of the motor, counting the received times of the current rotating speed of the motor, and adjusting the current duty ratio according to the received times of the current rotating speed of the motor so as to adjust the current rotating speed of the motor in real time; and when the received current rotating speed number of the motor reaches a preset feedback number n, adjusting the motor to operate at a target duty ratio P0 according to a PID algorithm so as to enable the current rotating speed of the motor to reach a target rotating speed.
The soft starting method of the motor of the air conditioner provided by the embodiment of the invention has the advantages of stable motor rotating speed adjustment, comfortable user experience and the like.
According to the motor soft start method of the air conditioner, the current duty ratio is adjusted according to the received times of the current rotating speed of the motor, and the method comprises the following steps: presetting a plurality of times counting intervals which are continuous from small to large, wherein each time counting interval has a corresponding duty ratio adjusting value; and when the counted times of the current rotating speed of the motor reach each time counting interval, taking a duty ratio adjustment value corresponding to the time counting interval as the current duty ratio of the motor.
Furthermore, the number of times counting intervals is three, wherein the boundary of the first two adjacent times counting intervals is 7-11 times, and the boundary of the second two adjacent times counting intervals is 27-31 times;
further, the preset feedback time n is 129 to 149.
According to the soft starting method of the motor of the air conditioner, the initial duty ratio P1, the duty ratio adjustment values corresponding to the multiple times counting intervals in sequence from small to large and the target duty ratio P0 are increased in sequence from small to large.
According to the soft starting method of the motor of the air conditioner, the initial duty ratio P1, the duty ratio adjustment values corresponding to the times counting intervals and the target duty ratio P0 are all in inverse proportion to the output voltage of the motor.
According to the motor soft start method of the air conditioner, provided by the embodiment of the invention, the time interval between two adjacent times of receiving the current rotating speed of the motor is 15-25 ms.
According to the motor soft start method of the air conditioner, the motor is adjusted to operate at the target duty ratio P0 according to the PID algorithm, and the method comprises the following steps: acquiring the current rotating speed of the motor once every preset time interval, substituting the newly acquired current rotating speed and the target rotating speed of the motor into a PID algorithm, calculating a target duty ratio P0 value, and controlling the motor to operate at a target duty ratio P0.
Further, the preset time t is 100 ms.
According to the motor soft start method of the air conditioner, the initial duty ratio P1 is (345-355)/511; the target duty ratio P0 is (400-410)/511.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a first part of a motor soft start control method of an air conditioner according to an embodiment of the present invention;
fig. 2 is a flowchart of a second part of a motor soft start control method of an air conditioner according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
A motor soft start method of an air conditioner according to an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in fig. 1 and 2, a motor soft start method of an air conditioner according to an embodiment of the present invention includes:
controlling the motor to start and operate at an initial duty ratio P1;
continuously receiving the current rotating speed of the motor, counting the received times of the current rotating speed of the motor, and adjusting the current duty ratio according to the received times of the current rotating speed of the motor so as to adjust the current rotating speed of the motor in real time;
and when the received current rotating speed number of the motor reaches the preset feedback number n, adjusting the motor to operate at the target duty ratio P0 according to a PID algorithm so as to enable the current rotating speed of the motor to reach the target rotating speed.
For example, the number of times the current rotation speed of the motor is received may be the number of times the motor rotation speed feedback signal is received. The motor can be a direct current motor, and particularly can be a motor of an indoor unit fan. The initial duty cycle P1 is less than the subsequently adjusted duty cycle. The duty ratio adjusted according to the times of receiving the current rotating speed of the motor is a given numerical value under the current rotating speed and is not influenced by other factors.
According to the motor soft start method of the air conditioner, the number of times of the received current rotating speed of the motor is counted after the motor is started, and the air conditioner can quickly reach the stable rotating speed when the air conditioner operates at the duty ratio according to the specified duty ratio before the current rotating speed of the motor reaches the preset feedback number n. And when the received current rotating speed number of the motor reaches the preset feedback number n, the rotating speed of the motor reaches a stable state. At the moment, the current rotating speed of the motor and the set target rotating speed are brought into the PID algorithm according to the PID algorithm, the calculated target duty ratio P0 can be more accurate after the motor rotates stably, so that the subsequent rotating speed of the motor can be adjusted more accurately and stably, the phenomenon that the target duty ratio P0 is calculated by the PID algorithm when the rotating speed of the motor is not stable, the rotating speed of the motor is inaccurately adjusted by the target duty ratio P0, the difference between the rotating speed adjusted by the motor and the target rotating speed is large is avoided, and the phenomenon that the wind speed is suddenly increased due to the inaccurate target duty ratio P0, and the discomfort brought to a user is avoided.
Therefore, the soft starting method of the motor of the air conditioner provided by the embodiment of the invention has the advantages of stable motor speed adjustment, comfortable user experience and the like.
In some embodiments of the present invention, as shown in fig. 1, adjusting the current duty ratio according to the received number of times of the current rotation speed of the motor includes:
presetting a plurality of times counting intervals which are continuous from small to large, wherein each time counting interval has a corresponding duty ratio adjusting value;
and when the counted times of the current rotating speed of the motor reach each time counting interval, taking the duty ratio adjustment value corresponding to the time counting interval as the current duty ratio of the motor.
For example, the interval of the counted number of times is gradually increased, and the rotation speed of the fan is not stable just before the motor starts, so the number of times of receiving the current rotation speed of the motor needs to be counted shortly after the fan is just started, and the current duty ratio is adjusted to the duty ratio adjustment value corresponding to the number of times interval in time. After the motor is started slightly stably, counting the number counting interval after reaching, wherein the counting interval can be increased, the current duty ratio is continuously adjusted to the duty ratio value corresponding to the interval, and the motor runs at the adjusted duty ratio until the rotating speed of the motor gradually reaches stability.
Further, as shown in fig. 1, the number of times counting section is three, wherein the first two adjacent times counting sections are divided into 7 times to 11 times, and the second two adjacent times counting sections are divided into 27 times to 31 times.
And in the same frequency counting interval, for example, the frequency counting interval from 1 st time to 9 th time, the same duty ratio adjustment value is kept, in the frequency counting interval from 10 th time to 29 th time, the same duty ratio adjustment value is kept, and when the frequency counting interval reaches the preset feedback frequency n from 30 th time, the same duty ratio adjustment value is kept. The adjustment value of the duty ratio does not need to be changed all the time, and when the counted number of times of the current rotating speed of the motor reaches the preset feedback number n, the rotating speed of the motor can be adjusted to be stable through duty ratio output in different intervals.
Further, the preset feedback times n are 129 to 149, such as 139. When the number of times of receiving the current rotating speed of the motor of statistics reaches preset feedback number of times n, the rotating speed of the motor reaches stability, so that good air outlet experience is obtained when the rotating speed of the fan is further adjusted, and the change of the air outlet speed is avoided.
In some embodiments of the present invention, the initial duty ratio P1, the duty ratio adjustment values corresponding to the multiple times counting intervals sequentially increase from small to large, and the target duty ratio P0 increases sequentially from small to large.
The variation trend of the duty ratio adjustment value corresponding to each interval is gradually adjusted from the value of the initial duty ratio P1 to the value of the target duty ratio P0. The change of the duty ratio is smooth, and the wind speed of the fan can be adjusted to a stable state more smoothly.
In some embodiments of the present invention, the initial duty ratio P1, the duty ratio adjustment values corresponding to the plurality of times counting intervals, and the target duty ratio P0 are all inversely proportional to the output voltage of the motor. The lower the duty ratio of the motor, the higher the output voltage, because the motor just starts, need drive great load start, often set up great power, the motor runs with lower initial duty ratio P1, afterwards, the duty ratio adjustment value increases to some extent in first number of statistics interval, output voltage descends to reduce the torque of motor, output comparatively moderate output voltage when this duty ratio, in second number of statistics interval and third number of statistics interval, the duty ratio adjustment value further increases, reach the higher numerical value of target duty ratio P0 gradually.
In some embodiments of the present invention, the time interval between two adjacent times of receiving the current rotation speed of the motor is 15ms to 25 ms.
For example, when the motor is operated at a rotation speed of 1000 rpm, a time interval between two adjacent times of receiving the current rotation speed of the motor is 17ms, and when the motor is operated at a rotation speed of 1500 rpm, a time interval between two adjacent times of receiving the current rotation speed of the motor is 20 ms. The motor can the rotational speed can obtain timely feedback, and the adjustment duty cycle is more timely to the motor reaches stable rotational speed sooner.
The motor soft start method of an air conditioner according to claim 1, as shown in fig. 2, wherein adjusting the motor to operate at a target duty ratio P0 according to a PID algorithm comprises:
and acquiring the current rotating speed of the motor once every preset time, substituting the newly acquired current rotating speed and the target rotating speed of the motor into a PID algorithm, calculating a target duty ratio P0 value, and controlling the motor to operate at a target duty ratio P0.
When the rotating speed of the motor is stable, the target duty ratio P0 is adjusted in real time through a PID algorithm, so that the target rotating speed is adjusted in real time, and the indoor fan can continuously and stably operate.
Further, the preset time t is 100 ms. The current rotating speed of the motor is obtained every 100ms, so that the current duty ratio is adjusted in real time, the wind speed of the motor is always kept at the target rotating speed, and the stability of air outlet of the air conditioner is guaranteed.
In some embodiments of the present invention, the initial duty cycle P1 is (345-355)/511; the target duty ratio P0 is (400-410)/511.
Specifically, 511 times are counted by the counter, the counted power-on times in 511 times when the motor is just started is 345 to 355 times, the counted power-on times in 511 times when the motor is stable is 400 to 410 times, the value of the initial duty ratio P1 to the value of the target duty ratio P0 is gradually increased, the output voltage of the motor is gradually reduced, the voltage output in the duty ratio range is more reasonable, and the operation of the motor is more stable.
Other constructions and operations of the motor soft start method of the air conditioner according to the embodiment of the present invention are known to those skilled in the art and will not be described in detail herein.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean 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 invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A motor soft start method of an air conditioner is characterized by comprising the following steps:
controlling the motor to start and operate at an initial duty ratio P1;
continuously receiving the current rotating speed of the motor, counting the received times of the current rotating speed of the motor, and adjusting the current duty ratio according to the received times of the current rotating speed of the motor so as to adjust the current rotating speed of the motor in real time;
and when the received current rotating speed number of the motor reaches a preset feedback number n, adjusting the motor to operate at a target duty ratio P0 according to a PID algorithm so as to enable the current rotating speed of the motor to reach a target rotating speed.
2. The motor soft start method of an air conditioner according to claim 1, wherein the adjusting the current duty ratio according to the received number of times of the current rotation speed of the motor comprises:
presetting a plurality of times counting intervals which are continuous from small to large, wherein each time counting interval has a corresponding duty ratio adjusting value;
and when the counted times of the current rotating speed of the motor reach each time counting interval, taking a duty ratio adjustment value corresponding to the time counting interval as the current duty ratio of the motor.
3. The motor soft start method of the air conditioner according to claim 2, wherein the number of times counting section is three, wherein the first two adjacent times counting sections are divided into 7 times to 11 times, and the second two adjacent times counting sections are divided into 27 times to 31 times.
4. The motor soft start method of an air conditioner according to claim 3, wherein the preset number of feedback times n is 129 to 149 times.
5. The motor soft start method of the air conditioner according to claim 2, wherein the initial duty ratio P1, a plurality of duty ratio adjustment values corresponding to the number of times counting intervals in turn from small to large, and the target duty ratio P0 are increased in turn from small to large.
6. The motor soft-start method of an air conditioner according to claim 2, wherein the initial duty ratio P1, the duty ratio adjustment values corresponding to a plurality of the number of times counting intervals, and the target duty ratio P0 are all inversely proportional to the output voltage of the motor.
7. The motor soft start method of an air conditioner according to claim 1, wherein a time interval between two adjacent times of receiving the current rotation speed of the motor is 15ms to 25 ms.
8. The motor soft start method of an air conditioner according to claim 1, wherein the adjusting the motor to operate at a target duty ratio P0 according to a PID algorithm comprises:
acquiring the current rotating speed of the motor once every preset time interval, substituting the newly acquired current rotating speed and the target rotating speed of the motor into a PID algorithm, calculating a target duty ratio P0 value, and controlling the motor to operate at a target duty ratio P0.
9. The motor soft start method of an air conditioner according to claim 8, wherein the preset time t is 100 ms.
10. The motor soft start method of an air conditioner according to claim 1, wherein the initial duty ratio P1 is (345-355)/511; the target duty ratio P0 is (400-410)/511.
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| CN202111392950.XA CN114204851A (en) | 2021-11-23 | 2021-11-23 | Motor soft starting method of air conditioner |
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2021
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