CN111609514A - Fan noise control method and device and air conditioning equipment - Google Patents
Fan noise control method and device and air conditioning equipment Download PDFInfo
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- CN111609514A CN111609514A CN202010427231.6A CN202010427231A CN111609514A CN 111609514 A CN111609514 A CN 111609514A CN 202010427231 A CN202010427231 A CN 202010427231A CN 111609514 A CN111609514 A CN 111609514A
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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
- F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
- F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
- F24F1/40—Vibration or noise prevention at outdoor units
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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
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
- F24F11/63—Electronic processing
- F24F11/64—Electronic processing using pre-stored data
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
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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
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/24—Means for preventing or suppressing noise
- F24F2013/247—Active noise-suppression
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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
- F24F2130/00—Control inputs relating to environmental factors not covered by group F24F2110/00
- F24F2130/40—Noise
Abstract
The invention discloses a fan noise control method and device and air conditioning equipment. The target noise reduction unit comprises at least two fans, and the rotating speeds of the at least two fans at the same moment are the same, and the method comprises the following steps: determining the noise peak frequency corresponding to the current rotating speed of the fan; and respectively controlling the voltage phases of at least two fans according to the noise peak frequency and the number of the fans, so that the noise phases of at least two fans at the noise peak frequency are cancelled. The invention enables the noise phases emitted by the fans at the noise peak frequency point under the current rotating speed to be mutually offset by controlling the voltage phases of the fans in the unit, thereby reducing the noise peak value, reducing the integral noise value of the air conditioner and improving the comfort of the air conditioner.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a fan noise control method and device and air conditioning equipment.
Background
How to control the noise of the air conditioner is always a hot issue. As is known, a fan is the most important source of air conditioner noise, and is particularly important for controlling the fan noise. The fan noise is mainly generated by the operation of a motor, the motor can generate vibration when in operation, and when the vibration frequency value is close to the natural frequency point of the unit, the noise value of the unit can be greatly amplified.
The current solutions are generally to reduce the vibration value, change the fixed frequency point of the unit or increase the damping of the unit. However, the above method is difficult to reduce the noise level to a level that meets the requirements, and the noise cannot be effectively controlled.
Disclosure of Invention
The embodiment of the invention provides a fan noise control method and device and air conditioning equipment, and aims to solve the problem that fan noise cannot be effectively controlled in the prior art.
In order to solve the above technical problem, an embodiment of the present invention provides a fan noise control method, where a target noise reduction unit includes at least two fans, and the rotation speeds of the at least two fans at the same time are the same, where the method includes:
determining the noise peak frequency corresponding to the current rotating speed of the fan;
and respectively controlling the voltage phases of at least two fans according to the noise peak frequency and the number of the fans, so that the noise phases of at least two fans at the noise peak frequency are cancelled.
Optionally, before determining the noise peak frequency corresponding to the current rotation speed of the fan, the method further includes:
collecting noise frequency spectrums of the fan at each rotating speed gear;
determining noise peak frequency corresponding to each rotating speed gear according to the noise frequency spectrum;
and storing the corresponding relation between each rotating speed gear and the noise peak frequency of the rotating speed gear.
Optionally, the step of respectively controlling the voltage phases of the at least two fans according to the noise peak frequency and the number of the fans, so that the noise phases of the at least two fans at the noise peak frequency are cancelled out, includes:
determining a reference fan in at least two of said fans;
determining respective delay time of other fans except the reference fan in at least two fans according to the noise peak frequency and the number of the fans;
and correspondingly controlling the switching time of the other fans according to the delay time.
Optionally, determining respective delay times of other fans except the reference fan in the at least two fans according to the noise peak frequency and the number of the fans, including:
respectively calculating the delay time of each fan in the other fans relative to the reference fan according to the following formula: t is tmThe method comprises the following steps that (i) f represents the noise peak frequency, n represents the number of fans, m represents the mth fan of other fans in sequence from short to long according to delay time, and t ismAnd represents the delay time of the mth fan.
Optionally, the step of respectively controlling the voltage phases of the at least two fans according to the noise peak frequency and the number of the fans, so that the noise phases of the at least two fans at the noise peak frequency are cancelled out, includes:
if the number of the fans is four or more, grouping the fans according to the number of the fans, wherein each group at least comprises two fans;
for each group, respectively determining a reference fan in the group;
determining respective delay time of other fans except the reference fan in the group according to the noise peak frequency and the number of the fans in the group;
and correspondingly controlling the switching time of other fans in the group according to the delay time.
Optionally, the distance between adjacent motors in the motors corresponding to the at least two fans is smaller than a preset threshold.
The embodiment of the invention also provides a fan noise control device, wherein the target noise reduction unit comprises at least two fans, the rotating speeds of the at least two fans at the same time are the same, and the device comprises:
the determining module is used for determining the noise peak frequency corresponding to the current rotating speed of the fan;
and the control module is used for respectively controlling the voltage phases of at least two fans according to the noise peak frequency and the number of the fans, so that the noise phases of at least two fans at the noise peak frequency are cancelled.
Optionally, the control module includes:
a reference determination unit for determining a reference fan among the at least two fans;
the delay determining unit is used for determining respective delay time of other fans except the reference fan in at least two fans according to the noise peak frequency and the number of the fans;
and the control unit is used for correspondingly controlling the switching time of the other fans according to the delay time.
An embodiment of the present invention further provides an air conditioning apparatus, including: the embodiment of the invention provides a fan noise control device.
The embodiment of the invention also provides a computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the fan noise control method is realized.
By applying the technical scheme of the invention, the noise peak frequency corresponding to the current rotating speed of the fan is determined, and the voltage phases of at least two fans are respectively controlled according to the noise peak frequency and the number of the fans, so that the noise phases of at least two fans at the noise peak frequency are cancelled. The voltage phases of the fans in the unit are controlled, so that the noise phases emitted by the fans at the noise peak frequency point at the current rotating speed are mutually offset, the noise peak value is reduced, the integral noise value of the air conditioner is reduced, and the comfort of the air conditioner is improved.
Drawings
Fig. 1 is a flowchart of a fan noise control method according to an embodiment of the present invention;
FIG. 2 is a diagram of a noise spectrum according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a noise waveform when a single fan operates according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a noise waveform when the dual fans are operated synchronously according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a noise waveform when the dual fans are not synchronized (off-peak) according to an embodiment of the present invention;
fig. 6 is a block diagram of a fan noise control device according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
The present embodiment provides a fan noise control method, which performs noise reduction on multiple fans (i.e., at least two fans) based on phase cancellation. The target noise reduction unit comprises at least two fans which are identical fans and have the same rotating speed at the same moment. The target noise reduction unit may be an air conditioner internal unit or an air conditioner external unit.
Fig. 1 is a flowchart of a fan noise control method according to an embodiment of the present invention, and as shown in fig. 1, the method includes the following steps:
and S101, determining the noise peak frequency corresponding to the current rotating speed of the fan.
The noise peak frequency corresponding to the current rotating speed of the fan can be determined according to the corresponding relation between the pre-stored rotating speed gears and the noise peak frequency. Correspondingly, before determining the noise peak frequency corresponding to the current rotating speed of the fan, the method further comprises the following steps: collecting noise frequency spectrums of the fan at each rotating speed gear; determining noise peak frequency corresponding to each rotating speed gear according to the noise frequency spectrum; and storing the corresponding relation between each rotating speed gear and the noise peak frequency of the rotating speed gear.
And S102, respectively controlling the voltage phases of the at least two fans according to the noise peak frequency and the number of the fans, so that the noise phases of the at least two fans at the noise peak frequency are cancelled.
Wherein, the voltage phase of the fan can be controlled by controlling the voltage signal or the current signal supplied to the fan motor. When the given operating voltages of the fans are the same at the same time, the frequency and the phase of the noise generated by the fans are the same, and the noise amplitude at the same frequency point is superposed. When the given voltage phases of the fans are different at the same moment, the generated noise has the same frequency, but the noise phases are different, so that the waveforms at the same frequency point are offset.
According to the fan noise control method, the noise peak frequency corresponding to the current rotating speed of the fan is determined, and the voltage phases of the at least two fans are respectively controlled according to the noise peak frequency and the number of the fans, so that the noise phases of the at least two fans at the noise peak frequency are cancelled. The voltage phases of the fans in the unit are controlled, so that the noise phases emitted by the fans at the noise peak frequency point at the current rotating speed are mutually offset, the noise at the frequency point is close to 0 after being synthesized, the noise peak value is reduced, the integral noise value of the air conditioner is reduced, and the comfort of the air conditioner is improved.
In an optional embodiment, the controlling the voltage phases of the at least two fans according to the noise peak frequency and the number of fans respectively, so that the noise phases of the at least two fans at the noise peak frequency are cancelled out, includes: determining a reference fan in the at least two fans; determining respective delay time of other fans except the reference fan in the at least two fans according to the noise peak frequency and the number of the fans; and correspondingly controlling the on-off time of other fans according to the delay time.
The reference fan is a fan which does not need time delay and serves as a reference for time delay operation of other fans. Specifically, one fan may be randomly selected as the reference fan, or the reference fan may be selected according to the installation position of the fan, for example, one fan closest to the side is selected as the reference fan from three fans arranged side by side. The delay time corresponds to a voltage phase change supplied to the fan, for example, a delay time of T/2, corresponding to a voltage phase change (noise phase change) ± 180 degrees. The phases of the voltages are different, and the phases of the noise generated by the fan are different. The control of the switching time of the fan can be realized by controlling the switching time of a switching device in an inverter of the fan, the inverter is used for driving a fan motor and can be arranged in the motor or the motor, and the switching device in the inverter can be an MOS (metal oxide semiconductor) tube or an IGBT (insulated gate bipolar transistor) and the like. The phase of the voltage supplied to the fan can be changed by controlling the switching time of the switching device.
Further, according to the noise peak frequency and the number of the fans, determining respective delay time of other fans except the reference fan in the at least two fans, includes: respectively calculating the delay time of each fan in the other fans relative to the reference fan according to the following formula: t is tmThe method is characterized in that the method comprises the following steps that (i) m/fn, wherein f represents noise peak frequency, n represents the number of fans, m represents the mth fan under the sequence of other fans according to delay time from short to long, and tmAnd represents the delay time of the mth fan.
The delay time may be relative to the reference fan or relative to the previous fan. The values of the delay time are different when the reference objects are different. Illustratively, three fans, the first fan being the reference fan, the second fan being delayed 1/3f with respect to the reference fan, and the third fan being delayed 2/3f (with respect to the second fan delay 1/3f) with respect to the reference fan. The delay time of the reference fan is regarded as 0, and then the sum of the delay times of all the fans is a multiple of the noise peak value period, and correspondingly, the voltage phase change of the reference fan is regarded as 0, and the sum of the voltage phase changes of all the fans is a multiple of 360 degrees.
In an optional embodiment, the controlling the voltage phases of the at least two fans according to the noise peak frequency and the number of fans respectively, so that the noise phases of the at least two fans at the noise peak frequency are cancelled out, includes: if the number of the fans is four or more, grouping the fans according to the number of the fans, wherein each group at least comprises two fans; respectively determining a reference fan in each group aiming at each group; determining the respective delay time of other fans except the reference fan in the group according to the noise peak frequency and the number of the fans in the group; and correspondingly controlling the switching time of other fans in the group according to the delay time.
In the present embodiment, another specific control method is provided for four or more fans, that is, fans are grouped, and noise phase cancellation of noise peak frequency is performed for each group. For example, for four fans, the noise control mode may be: the first fan is a reference fan, the second fan is delayed 1/4f relative to the reference fan, the third fan is delayed 1/2f relative to the reference fan, and the fourth fan is delayed 3/4f relative to the reference fan; or four fans may be divided into two groups, and each group may be controlled according to two fans, i.e., one fan is used as a reference fan and the other fan is delayed 1/2 f.
Preferably, the distance between adjacent motors in the motors corresponding to the at least two fans is smaller than a preset threshold. The distance between adjacent motors is short, so that the influence of the long distance between the motors on noise phase offset can be avoided, and the smooth realization of noise offset is ensured. For example, as an application scenario, two fans are arranged side by side in an indoor unit, and the distance between the fan motors is smaller than a preset threshold, the noise peak can be reduced through the above steps.
The principle of the fan noise control method according to the present invention will be described with reference to fig. 2 to 5.
When the fan runs at different rotating speed gears, the generated noise is also different, so that noise data of the fan at each rotating speed gear can be tested in advance and used as a reference for subsequent noise control. Specifically, in the air conditioner development process, noise frequency spectrums of the fan under all rotation speed gears are collected, and for each rotation speed gear, the noise peak frequency corresponding to the rotation speed gear can be obtained according to the noise frequency spectrums under the rotation speed gear. More specifically, the set time duration can be measured by using a spectrum analyzer to obtain the fan frequency spectrum. As shown in fig. 2, it is a noise spectrum diagram of the fan at a certain speed gear, where the abscissa represents noise frequency and the ordinate represents noise amplitude, and it can be known from the noise spectrum diagram shown in fig. 2 that a peak frequency point of 92Hz appears at the speed gear.
Fig. 3 is a schematic diagram of a noise waveform when a single fan operates, and the schematic diagram does not consider attenuation of sound in air. The coordinate axis with the scale value of-1 to 1 represents the noise loudness amplitude, the other two coordinate axes represent the displacement (distance) in different directions, and the intersection point of the three-axis origin points is the position of the fan motor.
When a plurality of fans operate synchronously, the synchronous operation refers to that the fans are given the same operating voltage (namely, the phase, the frequency and the amplitude of the voltage are all consistent), and because the fans are the same and the given voltage is the same, the frequency and the phase of noise generated by each fan are the same, the amplitude of the noise at the same frequency point is superposed, and the loudness is doubled. As shown in fig. 4, which is a schematic diagram of noise waveforms when the two fans operate synchronously, compared with fig. 3, the noise amplitudes of the two fans are superimposed.
When a plurality of fans are not operated synchronously (i.e., the voltage supplied to each fan at the same time is different in phase), the generated noise has the same frequency, but the noise has different phases, and the waveforms at the same frequency point are offset. Through a corresponding control algorithm, the phases of the peak frequency points of the noise of the multiple fans are just offset, the noise waveforms can be offset, and the noise of the unit is improved.
For example, for two identical fan motors, the noise emitted by a single motor is expressed as Y1 ═ Asin (wt + Φ) under normal conditions, and the sum of the two motor noises is expressed as Y ═ 2Asin (wt + Φ); by controlling the driving program, the noise expression from the motor 1 is Y1 ═ Asin (wt + Φ), the noise expression from the motor 2 is Y2 ═ Asin (wt + Φ +180 °), or Y2 ═ Asin (wt + Φ -180 °), and the superimposed noise is Y1+ Y2 ═ 0, which greatly improves the noise performance of the unit. Where Y, Y1 and Y2 both represent displacements, a represents amplitude, w represents angular frequency, the period T is 2 pi/w, T represents time, wt + phi represents phase, and phi represents initial phase.
As shown in fig. 5, it is a schematic diagram of a noise waveform when the dual fans are not synchronized (off-peak), and the noise phases of different fans at the noise peak frequency point are exactly offset by controlling the driving of the fan motors.
Based on the principle, the voltage or current signals of the motors are controlled by controlling the switching time of the inverter power electronic devices of the motors, so that the voltage phases of different fans at the same moment are staggered for a period of time, and the peak noises generated by the fans are just offset.
For example, in the case of two fans, assuming that the rotation speed of the first fan after operation is k at the current time, peak noise with frequency a × k is generated, and a is a coefficient. The air at the position of the receiver is a vibration particle, the phase corresponding to the peak noise frequency of the particle is phi, and the vibration equation of the corresponding particle is Y1-Asin (wt + phi); through a control algorithm, the phase corresponding to the peak noise frequency of the second fan at the moment is phi +/-pi, and the corresponding particle vibration equation is Y1-Asin (wt + phi + pi) or Y1-Asin (wt + phi-pi); the vibration of the two mass points is just 0 after being superposed, and the effect of reducing vibration and noise is achieved. Similarly, if there are three fans and four fans, the vibration equations of the fans at the mass point can be mutually offset.
Example two
Based on the same inventive concept, the embodiment provides a fan noise control device, which can be used for implementing the fan noise control method described in the above embodiment. The device may be implemented by software and/or hardware, and the device may be generally integrated into an air conditioner controller. The target noise reduction unit comprises at least two fans, and the rotating speeds of the at least two fans at the same moment are the same.
Fig. 6 is a block diagram of a fan noise control device according to a second embodiment of the present invention, and as shown in fig. 6, the device includes:
the determining module 61 is configured to determine a noise peak frequency corresponding to the current rotation speed of the fan;
and the control module 62 is configured to control the voltage phases of the at least two fans according to the noise peak frequency and the number of the fans, so that the noise phases of the at least two fans at the noise peak frequency are cancelled out.
Optionally, the apparatus further comprises:
the acquisition module is used for acquiring noise frequency spectrums of the fan at each rotating speed gear before determining the noise peak frequency corresponding to the current rotating speed of the fan;
the frequency determination module is used for determining the noise peak frequency corresponding to each rotating speed gear according to the noise frequency spectrum;
and the storage module is used for storing the corresponding relation between each rotating speed gear and the noise peak frequency of the rotating speed gear.
Optionally, the control module 62 includes:
a reference determination unit for determining a reference fan among the at least two fans;
the delay determining unit is used for determining respective delay time of other fans except the reference fan in the at least two fans according to the noise peak frequency and the number of the fans;
and the first control unit is used for correspondingly controlling the switching time of other fans according to the delay time.
Further, the delay determining unit is specifically configured to: respectively calculating the delay time of each fan in the other fans relative to the reference fan according to the following formula: t is tmThe method is characterized in that the method comprises the following steps that (i) m/fn, wherein f represents noise peak frequency, n represents the number of fans, m represents the mth fan under the sequence of other fans according to delay time from short to long, and tmAnd represents the delay time of the mth fan.
Optionally, the control module 62 includes:
the grouping unit is used for grouping according to the number of the fans if the number of the fans is four or more, wherein each group at least comprises two fans;
the second control unit is used for determining a reference fan in each group respectively according to each group; determining the respective delay time of other fans except the reference fan in the group according to the noise peak frequency and the number of the fans in the group; and correspondingly controlling the switching time of other fans in the group according to the delay time.
Optionally, a distance between adjacent motors in the motors corresponding to the at least two fans is smaller than a preset threshold.
The device can execute the method provided by the embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
EXAMPLE III
The present embodiment provides an air conditioning apparatus including: the fan noise control device according to the second embodiment.
Example four
The present embodiment provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the fan noise control method according to the first embodiment of the present invention.
EXAMPLE five
The present embodiment provides an electronic device, including: at least one processor; and a memory communicatively coupled to the at least one processor; the memory stores instructions executable by the at least one processor, and the instructions, when executed by the at least one processor, implement the fan noise control method according to the first embodiment of the present invention.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus necessary general hardware, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A fan noise control method is characterized in that a target noise reduction unit comprises at least two fans, and the rotating speeds of the at least two fans at the same moment are the same, and the method comprises the following steps:
determining the noise peak frequency corresponding to the current rotating speed of the fan;
and respectively controlling the voltage phases of at least two fans according to the noise peak frequency and the number of the fans, so that the noise phases of at least two fans at the noise peak frequency are cancelled.
2. The method of claim 1, prior to determining a peak noise frequency corresponding to a current speed of the fan, further comprising:
collecting noise frequency spectrums of the fan at each rotating speed gear;
determining noise peak frequency corresponding to each rotating speed gear according to the noise frequency spectrum;
and storing the corresponding relation between each rotating speed gear and the noise peak frequency of the rotating speed gear.
3. The method of claim 1, wherein separately controlling the voltage phases of at least two of the fans based on the noise peak frequency and the number of fans such that the noise phases of at least two of the fans at the noise peak frequency cancel each other out comprises:
determining a reference fan in at least two of said fans;
determining respective delay time of other fans except the reference fan in at least two fans according to the noise peak frequency and the number of the fans;
and correspondingly controlling the switching time of the other fans according to the delay time.
4. The method of claim 3, wherein determining respective delay times of at least two of the fans other than the reference fan based on the noise peak frequency and the number of fans comprises:
respectively calculating the delay time of each fan in the other fans relative to the reference fan according to the following formula: t is tmThe method comprises the following steps that (i) f represents the noise peak frequency, n represents the number of fans, m represents the mth fan of other fans in sequence from short to long according to delay time, and t ismAnd represents the delay time of the mth fan.
5. The method of claim 1, wherein separately controlling the voltage phases of at least two of the fans based on the noise peak frequency and the number of fans such that the noise phases of at least two of the fans at the noise peak frequency cancel each other out comprises:
if the number of the fans is four or more, grouping the fans according to the number of the fans, wherein each group at least comprises two fans;
for each group, respectively determining a reference fan in the group;
determining respective delay time of other fans except the reference fan in the group according to the noise peak frequency and the number of the fans in the group;
and correspondingly controlling the switching time of other fans in the group according to the delay time.
6. The method according to any one of claims 1 to 5, wherein the distance between adjacent ones of the motors corresponding to at least two of the wind turbines is less than a preset threshold.
7. A fan noise control device, characterized in that, the target noise reduction unit includes at least two fans, at least two the rotational speed of fan at the same moment is the same, the device includes:
the determining module is used for determining the noise peak frequency corresponding to the current rotating speed of the fan;
and the control module is used for respectively controlling the voltage phases of at least two fans according to the noise peak frequency and the number of the fans, so that the noise phases of at least two fans at the noise peak frequency are cancelled.
8. The apparatus of claim 7, wherein the control module comprises:
a reference determination unit for determining a reference fan among the at least two fans;
the delay determining unit is used for determining respective delay time of other fans except the reference fan in at least two fans according to the noise peak frequency and the number of the fans;
and the first control unit is used for correspondingly controlling the switching time of the other fans according to the delay time.
9. An air conditioning apparatus, characterized by comprising: the fan noise control apparatus of claim 7 or 8.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out a fan noise control method according to any one of claims 1 to 6.
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| CN202010427231.6A CN111609514B (en) | 2020-05-19 | 2020-05-19 | Fan noise control method and device and air conditioning equipment |
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| CN202010427231.6A CN111609514B (en) | 2020-05-19 | 2020-05-19 | Fan noise control method and device and air conditioning equipment |
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