Motor noise reduction control method and air conditioner

Abstract

The invention discloses a motor noise reduction control method and an air conditioner. The motor noise reduction control method comprises the following steps: testing in advance to obtain a corresponding noise rotating speed when a motor sends out abnormal noise, and dividing a full rotating speed interval of the motor into a plurality of corresponding gears and rotating speed intervals which are in one-to-one correspondence with the gears and in which the noise rotating speed is removed according to different working conditions of equipment, so as to form gear interval information corresponding to the motor; when the motor operates at a certain gear of a certain working condition for the first time, the rotating speed of the motor is adjusted according to the preset adjustment amplitude in the rotating speed interval of the gear, and meanwhile the noise quantized value of the corresponding rotating speed is monitored and calculated; and selecting the rotating speed with the minimum noise quantized value in the rotating speed interval of the gear as the final rotating speed of the gear under the working condition, and storing the final rotating speed into gear information. According to the invention, adaptive noise reduction of the motor can be realized.

Description

Technical Field

[0001] The present invention relates to the technical field of noise reduction, and in particular to a motor noise reduction control method capable of actively reducing noise. Background Art

[0002] Noise control is one of the key factors to improve the user experience and reliability of various electromechanical equipment. In many devices equipped with fan systems, the fan is often the core noise source, such as air conditioning systems, fresh air systems, air purifiers, computer cooling systems, industrial ventilation equipment, etc.

[0003] Taking duct-type air conditioner indoor units, compact air handling units, high-pressure ventilation equipment, etc. as examples, they generally use brushless DC motors (BLDC) or similar high-efficiency motors with centrifugal fan blades or crossflow fan blades. Although this combination is highly efficient and energy-saving, it is easy to excite abnormal noise problems such as electromagnetic noise (caused by motor magnetic field pulsation and cogging effect), mechanical noise (such as bearing noise), and structural resonance noise of the fan blade-motor shaft system during operation. These noises usually appear as peaks in the low and medium frequency bands (for example, concentrated below 2000Hz), which can seriously affect user comfort and even equipment reliability.

[0004] To solve this type of abnormal noise, the current equipment using fans usually adopts the technical means of "disabling" the speed points of the motors that generate large noise in the equipment control program. That is, when setting the equipment operating gear (such as the wind speed of the air conditioner), each gear is set at a safe speed point to avoid these speed points that are known to have noise problems, so as to achieve the effect of noise reduction.

[0005] However, this prior art still has the following problems: First, the noise of the airflow path is ignored. The startup noise generated by the airflow passing through various components is also an important part of the equipment noise. Only by disabling the motor speed point to suppress low-frequency vibration noise, it is impossible to effectively solve the medium and high-frequency noise problems caused by the airflow dynamics itself (such as sharp whistles and turbulent hissing). In order to solve this problem, some devices do not use the gear method to adjust the speed, but use the real-time speed adjustment method. By monitoring the noise in real time, when the noise is higher than the threshold, the speed is adjusted in real time. Although it can achieve a certain noise reduction effect, it requires more controller resources and the control cost is extremely high. In addition, if there is no restriction on the arbitrary change of the speed, whether it can match the user's target needs is also not considered.

[0006] Second, there is insufficient adaptability to supplier differences. Since different suppliers have inherent differences in aspects such as the electromagnetic scheme design of the motor, magnetic circuit structure, material selection (such as permanent magnets, silicon steel sheets, insulating materials), mechanical structure (such as stator and rotor lamination, housing stiffness, bearing selection), and production process (such as dynamic balance accuracy, assembly tolerance control). These differences directly lead to significant differences in the vibration and noise characteristics of the whole machine (including the frequency and amplitude of the noise peak and the corresponding "sensitive speed points") after assembling motors from different suppliers for the same model of equipment. Therefore, the method of fixedly disabling a certain speed point cannot be applied to all equipment of the same model.

[0007] Third, the scheme of a single disabled speed point has poor compatibility. What needs to be avoided is not only the "disabled points" caused by the vibration of each motor supplier itself, but also the new "disabled points" or noise deterioration areas on the air flow path that may be caused by the air flow change under different motor drives. It is almost impossible to find a set of common speed combinations that can avoid the vibration and noise of motors from all suppliers and the aerodynamic noise problems caused by the air flow they drive at the same time.

[0008] Moreover, the above method only targets the noise caused by the motor itself, and does not consider the situations where the air flow generated by the fan flows from one component to another component, resulting in noise generated by other components, thus leading to poor noise reduction effect.

[0009] Therefore, how to provide a motor noise reduction control method with relatively low control cost and good applicability is a technical problem to be solved. Summary of the Invention

[0010] In order to solve the technical problems of relatively high noise reduction control cost, poor noise reduction flexibility, and poor noise reduction effect in the prior art, the present invention proposes a motor noise reduction control method and an air conditioner.

[0011] The motor noise reduction control method proposed by the present invention includes: Pre-test to obtain the noise speed corresponding to the abnormal noise emitted by the motor, and divide the full speed range of the motor into corresponding multiple gears according to different working conditions of the equipment, as well as the speed ranges corresponding to the gears after removing the noise speed, so as to form the gear range information corresponding to the motor; When the equipment is started for the first time, obtain the corresponding gear range information according to the identification code of the motor; When the motor runs in a certain gear under a certain working condition for the first time, within the speed range of the gear, adjust the speed of the motor according to a preset adjustment amplitude, and simultaneously monitor and calculate the noise quantization value corresponding to the speed; Select the speed with the smallest noise quantization value within the speed range of the gear as the final speed of the gear under the working condition, and store it in the gear information.

[0012] Furthermore, the gear range information includes various operating conditions of the device, all gears of the motor corresponding to each operating condition, and the speed ranges corresponding to each gear.

[0013] Furthermore, the gear information includes the final speed corresponding to each gear, the noise quantization value corresponding to the final speed, and the operating condition corresponding to the noise quantization value.

[0014] Furthermore, when the motor is not operating for the first time in a certain gear of a certain operating condition, the final speed of the gear corresponding to the current operating condition is called for operation, and at the same time, the noise quantization value of this gear is monitored and calculated. If the noise quantization value is greater than the corresponding noise quantization value in the gear speed table or the sum of the corresponding noise quantization value and the allowable error amplitude, then within the speed range of this gear, the speed of the motor is adjusted according to the preset adjustment amplitude, and at the same time, the noise quantization value of the corresponding speed is monitored, and the speed with the smallest noise quantization value within the speed range of this gear is selected as the final speed of this gear, and the final speed is updated to the gear speed table.

[0015] Furthermore, the test includes: Operating the device under different operating conditions, starting to test the noise quantization value of the corresponding motor from its lowest speed. After each speed is tested, the preset adjustment amplitude is increased once based on the current speed to form a new current speed, and then the noise quantization value is continued to be tested until the highest speed is tested; Regarding the speed at which the noise quantization value is greater than the preset value as the noise speed corresponding to the abnormal noise emitted by the corresponding motor.

[0016] Furthermore, the preset adjustment amplitude is the minimum accuracy of the motor speed.

[0017] Furthermore, the noise quantization value is obtained by monitoring the total noise value and the noise peak value, and then subtracting the noise peak value from the total noise value.

[0018] Furthermore, the device includes an air conditioner, and the operating conditions of the device include at least one of nominal cooling, nominal heating, maximum cooling, maximum heating, dehumidification, and air supply.

[0019] Furthermore, the difference between the lowest speed of the speed range of the higher gear and the highest speed of the speed range of the lower gear among any two adjacent gears is between 50 - 100 rpm.

[0020] Furthermore, the preset value of the noise quantization value is [15 dB, 20 dB].

[0021] The air conditioner proposed by the present invention includes an indoor unit, an outdoor unit, and a control device, and this control device performs noise reduction control on the motor of the blower of the indoor unit according to the motor noise reduction control method of the above technical solution.

[0022] The present invention removes the noise speeds within the selectable speed range of the gear when setting the gear at the very beginning by finding the noise speeds of the motors of each manufacturer, so that when the device is applied to a specific motor, the noise influence caused by the quality of the motor itself can be avoided. Subsequently, when the motor is applied to a specific device, the final speed with the lowest noise of the gear is found, thereby achieving maximum noise reduction of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be described in detail below in conjunction with the embodiments and the drawings.

[0024] Figure 1 It is the main flowchart of an embodiment of the present invention.

[0025] Figure 2 It is a schematic table of gear range information of an embodiment of the present invention.

[0026] Figure 3 It is a schematic table of gear range information of another embodiment of the present invention.

[0027] Figure 4 It is a schematic table of gear information of an embodiment of the present invention.

[0028] Figure 5 It is a test flowchart of an embodiment of the present invention.

[0029] Figure 6 It is a flowchart of an application example of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention will be further described in detail below in conjunction with the drawings and the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0031] Therefore, a feature pointed out in this specification will be used to illustrate one feature of one embodiment of the present invention, rather than implying that each embodiment of the present invention must have the illustrated feature. In addition, it should be noted that this specification describes many features. Although some features may be combined together to show a possible system design, these features can also be used in other combinations not explicitly described. Therefore, unless otherwise stated, the described combination is not intended to be limiting.

[0032] As Figure 1 shown, in a basic embodiment, the motor noise reduction control method of the present invention includes the following main steps.

[0033] The pre-test obtains the noise speed corresponding to the abnormal noise emitted by the motor, and according to different working conditions of the equipment, divides the full speed range of the motor into corresponding multiple gears, and the speed ranges corresponding to the gears after removing the noise speed, so as to form the gear range information corresponding to the equipment and the motor. Taking an air conditioner as an example, the working conditions of the air conditioner can be the air supply mode, the refrigeration mode, the heating mode, etc. The gears corresponding to different working conditions can be the same or different. The speed ranges of the same gears under different working conditions can be the same or different, and can all be determined by technicians according to the actual situation.

[0034] When the equipment is started for the first time, according to the identification code of the motor, the corresponding gear range information is obtained. The identification code of the motor can be the manufacturer of the motor, the model of the motor, the combination of both, or other identifiers of the same type of motor that can determine that the noise speeds are similar.

[0035] When the motor runs for the first time at a certain gear in a certain working condition, within the speed range of this gear, the speed of the motor is adjusted according to a preset adjustment amplitude, and at the same time, the noise quantization value corresponding to the speed is monitored and calculated; Select the speed with the smallest noise quantization value within the speed range of this gear as the final speed of this gear in this working condition, and store it in the gear information.

[0036] In the present invention, the speed range of the gear of the motor has avoided the noise speed in advance, that is, the speed points where the motor is prone to generate noise are removed. When the motor runs for the first time at a certain gear in a certain working condition, within the relatively quiet speed range that has been screened, the speed with the lowest noise is found as the final speed of a gear. The present invention can preset the speed range of the corresponding gear according to the speed requirements when the equipment meets the user's needs, and then find the speed with the lowest noise within this speed range, which can achieve the purpose of meeting both the user's needs and the noise requirements. Moreover, the final usage mode of the present invention is still that a gear corresponds to a relatively fixed speed. Although this speed can change dynamically according to the situation, in the case of no special circumstances, the gear and the corresponding final speed can be used to achieve the purpose of effective noise reduction. Compared with the speed adjustment that changes in real time, in most cases, the present invention does not need to occupy a large amount of control resources in real time.

[0037] Such as Figure 2As shown, in a specific embodiment, the gear range information at least includes the operating conditions of the device, all the gears of the motor corresponding to each operating condition, and the speed range corresponding to each gear. In the case where the corresponding motor has been installed for the device, this can effectively record the gear range information of the motor of the corresponding device. How to determine the gears of a specific device according to the operating conditions of the device varies according to the device, and the rules are different, which belongs to the prior art and will not be elaborated in this invention. In specific applications, means such as a database can be used to store the gear range information of the motor of the device for convenient subsequent updates.

[0038] Figure 2 It is shown that for the needs of the device, the motor is set to gears 1 to n, and the value of n depends on the specific situation of the device. For example, the speed range [R11 min ,R11 max , where R11 min represents the minimum value of the speed range of operating condition 1 of the device and gear 1 of the motor, and R11 max represents the maximum value of the speed range of operating condition 1 of the device and gear 1 of the motor. Another example is the speed range [Rin min ,Rin max , where Rin min represents the minimum value of the speed range of operating condition i of the device and gear n of the motor, and Rin max represents the maximum value of the speed range of operating condition i of the device and gear n of the motor.

[0039] In other embodiments, the same device may use multiple motors. For example, device A may use motor a, or motor b, or motor c. Then, the gear range information can include the identification code of the motor corresponding to the device, the operating conditions of the device, all the gears of the motor corresponding to each operating condition, and the speed range corresponding to each gear. Figure 3 It is shown that the same device may use multiple motors, and different types of motors are produced by different manufacturers, so they can be represented by manufacturer 1, manufacturer 2,..., manufacturer m. The gears of different motors can be the same or different. Figure 3 It is shown that all motors are set to the same gears for the needs of the device, from gear 1 to n. The speed ranges of different motors under different operating conditions can be different or the same, depending on the actual situation. For example, the speed range [R111 min ,R111 max , where R111 min represents the minimum value of the speed range of operating condition 1, the corresponding motor produced by manufacturer 1, and gear 1, and R111 maxRepresents the maximum value of the speed range of the corresponding motor produced by the corresponding manufacturer 1 under the operating condition 1 of the device. For another example, the speed range [Rimn min , Rimn max , where Rimn min represents the minimum value of the speed range of the corresponding motor of the corresponding manufacturer m under the operating condition i of the device and the gear position n, and Rimn max represents the maximum value of the speed range of the corresponding motor of the corresponding manufacturer m under the operating condition i of the device and the gear position n.

[0040] The same manufacturer can also produce similar different devices. Then, the gear position range information can include the identification code of the device, the device number of the motor, the operating conditions of the device, all the gear positions of the motor corresponding to each operating condition, and the speed range corresponding to each gear position.

[0041] All the above situations of the gear position range information can be stored by means of a database or the like.

[0042] In a specific embodiment, the gear position information includes the final speed corresponding to each gear position, the noise quantization value corresponding to the final speed, and the operating condition corresponding to the noise quantization value.

[0043] Figure 4 Shows one way of storing the gear position information. The final speed and the noise quantization value corresponding to the operating condition 1 and the gear position 1 are stored in pairs. R11 represents the final speed currently stored for the operating condition 1 and the gear position 1. When this value exists and the device runs to the operating condition 1 and needs to control the gear position of the fan or other device at the gear position 1, the corresponding final speed can be directly called to reduce the occupied control resources. D11 represents the noise quantization value corresponding to the specific value of R11 selected as the final speed. Subsequently, the noise quantization value can be monitored, and when an abnormal situation occurs, the Figure 4 final speed in it can be updated in a timely manner. Correspondingly, Rin represents the final speed corresponding to the gear position n under the operating condition i, and Din represents the noise quantization value corresponding to the currently stored final speed Rin of the gear position n under the operating condition i.

[0044] The gear information and gear range information are preferably stored separately. The gear range information can be determined according to the design requirements of the equipment before leaving the factory, including how many gears are set for each working condition, what is the allowable speed range for each gear to meet the specific needs of users, and the noise speed can be the noise speed obtained from a single motor test. This method is simple and can be applied to all motors of the same model produced by the same manufacturer. The noise speed can also be obtained after the motor is installed on the equipment or on the corresponding components of the equipment. This method can be applied to the same equipment produced by the same manufacturer, and these same equipment use the same model of motors provided by the same supplier. Therefore, storing the corresponding information of the motor that can be determined before leaving the factory through the gear range information can effectively save time costs, storage costs, and control costs.

[0045] The gear information is an adaptive information that needs to be updated according to the situation. After being stored separately from the gear range information, it is more conducive to subsequent updates and calls, avoiding mutual interference of data.

[0046] Taking air conditioners as an example, even for air conditioners of the same model produced by the same manufacturer, even if these air conditioners use the same model of motors produced by the same supplier, due to factors such as different installation environments, different pipe lengths, and different height differences of the pipes of the air conditioners, the final noise conditions are also different. The gear information is the gear information that is adaptively adjusted when the equipment first uses a certain gear and is most suitable for the current equipment situation. Therefore, it can effectively improve the noise resistance of the same hardware in different environments.

[0047] In some embodiments, the gear information only needs to be updated once, and then the corresponding gear can be selected according to the working conditions, etc. Each gear can directly call its fixed final speed for control, which not only effectively reduces noise but also reduces control costs.

[0048] However, in some cases, as the usage time accumulates, the conditions of the various components of the equipment will also change more or less. Therefore, setting a fixed final speed for each speed consistently may not be applicable to all situations. Therefore, in a further embodiment, when the motor is not running for the first time in a certain gear of a certain working condition, the final speed corresponding to the gear of the current working condition is called for operation, and at the same time, the noise quantization value of this gear is monitored and calculated. If the noise quantization value is greater than the corresponding noise quantization value in the gear speed table or the sum of the corresponding noise quantization value and the allowable error amplitude, then within the speed range of this gear, the speed of the motor is adjusted according to the preset adjustment amplitude, and at the same time, the noise quantization value of the corresponding speed is monitored, and the speed with the smallest noise quantization value within the speed range of this gear is selected as the final speed of this gear, and the final speed is updated to the gear speed table.

[0049] In the above embodiments, it is only necessary to monitor the noise quantization value of the gear position. When the noise quantization value is normal, the final speed of the gear position can be adopted. Only when the noise quantization value is abnormal, the final speed of the gear position is adjusted. This can not only adapt to environmental changes but also reduce control costs during normal times.

[0050] As Figure 5 shown, in one embodiment, the test may include the following content.

[0051] Run the device under different working conditions, start testing the noise quantization value of the corresponding motor from its lowest speed. After each speed is tested, increase the preset adjustment range once based on the current speed to form a new current speed and then continue to test the noise quantization value until the highest speed is tested. Sort out each tested speed and its noise quantization value above. Take the speed with a noise quantization value greater than the preset value as the noise speed corresponding to when the corresponding motor makes abnormal noise. Thus, when setting the gear position of the set motor or the product where the motor is located (such as a fan, etc.), these noise speeds can be removed.

[0052] When a device has motors produced by multiple different manufacturers, the motors of each manufacturer can be tested once according to the Figure 5 steps to find the noise speeds of the motors produced by the corresponding manufacturer.

[0053] In one embodiment, the preset adjustment range is the minimum accuracy of the motor speed. For example, when the minimum accuracy of the motor speed is 10 rpm, the adjustment range is 10 rpm. By testing each speed with the minimum accuracy, all noise speeds can be effectively excluded. Of course, those skilled in the art can also set the preset adjustment range according to needs.

[0054] In one embodiment, the noise quantization value of the present invention is obtained by monitoring the total noise value and the noise peak value, and then subtracting the noise peak value from the total noise value.

[0055] There are many criteria for measuring noise, such as the frequency of the noise, the peak value of the noise, etc. The "total noise value" usually refers to the equivalent continuous sound level Leq or the average energy over other time periods. The "noise peak" usually refers to the maximum instantaneous sound pressure level Lmax within a time period. The present invention quantifies noise by subtracting the noise peak from the total noise value, quickly and intuitively quantifying the contribution or increase of the peak event to the average noise level (total value) during the entire measurement period, helping to identify abnormal or significant transient noise events and simplifying the perception of noise volatility / suddenness. For example, the larger the difference, the greater the interference of the peak event on the overall noise environment. A small difference means the noise is relatively stable (the peak is close to the average value). Since the present invention removes the noise rotation speed in advance, the difference should be relatively small under normal circumstances, but in abnormal cases, the difference should be relatively large, so that the motor can be adaptively noise-reduced based on different environments after being applied to specific equipment. In other embodiments, the calculation formula of the noise quantization value can be more complex. The noise quantization value can have multiple items, and each item has a weight coefficient. The number of items included are: the difference between the total noise value and the noise peak, the number of times the noise peak appears, and the duration of the noise peak. By multiplying each item by its weight and finally adding all the items together, the corresponding noise quantization value can be obtained.

[0056] Based on this, those skilled in the art can also make adaptive adjustments.

[0057] In one embodiment, the device referred to in the present invention includes an air conditioner, but is not limited to an air conditioner. The operating conditions of the air conditioner include at least one of nominal cooling, nominal heating, maximum cooling, maximum heating, dehumidification, and air supply.

[0058] Applying the present invention to an air conditioner, especially to the indoor unit of an air conditioner, can effectively reduce the noise of the indoor unit and achieve a relatively quiet effect on the premise of meeting the comfort requirements of users.

[0059] When the present invention is applied to the fan of an air conditioner, the difference between the lowest speed in the high-speed range and the highest speed in the low-speed range of any two adjacent gears is between 50 - 100 rpm. There is a speed gradient between each gear, and at the same time, the speed difference between gears is small, so that noise will not be caused due to excessive change in gear speed.

[0060] When applied to an air conditioner, the preset value of the noise quantization value for finding the noise rotation speed during testing is [15 dB, 20 dB]. When the noise of the indoor unit of the air conditioner is less than this range, users have no obvious noise perception.

[0061] The present invention also protects an air conditioner, which includes an indoor unit, an outdoor unit, and a control device. The control device performs noise reduction control on the motor of the blower of the indoor unit according to the motor noise reduction control method of the above technical solution.

[0062] As Figure 6 shown, in specific applications, the following several stages may be included.

[0063] In the first stage, a corresponding database is established. For different operating conditions of the air conditioner (such as refrigeration, heating, air supply, dehumidification, etc.), the whole-machine noise matching test is carried out for each motor manufacturer to determine the preset proprietary gear speed parameters. Specifically, the noise data of the indoor unit of the air conditioner is tested according to the national standard specified method, and it is tested once every 10 rpm within the range of the lowest speed and the highest speed of the motor. When presetting the motor gear speed, the noise test results are referred to to ensure that the noise value meets the standard and the sound quality is normal. The total noise value meets the national standard limit requirements. To ensure that the noise sound quality is normal, it further satisfies: total noise value - noise peak value ≥ X dB, and X takes values in [15, 20].

[0064] A range value can be set for each gear of the motor, that is, a speed interval [R min , R max , where the speed difference between the maximum speed and the minimum speed of the same gear is F, that is, R max - R min = F, with the unit of rpm; F is recommended to take the value of 50. The speed span between adjacent gears, that is, the minimum speed of the adjacent higher gear and the maximum speed of the lower gear differ by between 50 - 100 rpm.

[0065] The gear interval information of each motor manufacturer is stored in the controller unit of the air conditioner to form a corresponding database. Each motor manufacturer has a set of proprietary gear speed parameters under each operating condition for subsequent stage calls.

[0066] In the second stage, the motor manufacturer noise matching function can be set. The motor manufacturer noise matching function is set for the indoor unit of the air conditioner, and an initial gear is matched for each manufacturer, and the speed value is derived from the database in the controller. This function can be implemented by typing through the air conditioner hand controller (or remote controller) to select and determine the actual motor manufacturer.

[0067] In the third stage, the motor manufacturer noise matching function can be executed. During the installation and commissioning stage or when replacing the motor after-sales, the above function is used to call the corresponding gear interval information in the controller unit database.

[0068] The fourth stage is the optimization of the motor gear speed. Since the previous three stages have set a range of rotation speeds with better noise quality for the actually installed motor manufacturers, considering the influence of factors such as static pressure, wind resistance, and swing louver angle in the installation environment, there may be a certain difference between the motor noise characteristics and the original factory design state. Therefore, it is necessary to further optimize the speed within the rotation speed range of the initial gear. Because the speed range is limited, the optimization efficiency is relatively high.

[0069] That is, when a certain gear is used for the first time under a certain working condition, the speed is optimized within the rotation speed range of this gear to determine the final rotation speed of the gear. Specifically, a noise monitoring device and an analysis module are set in the air conditioner indoor unit. After the air conditioner runs, when the user actively sets the gear, or after automatically matching the gear according to parameters such as the target temperature, system pressure, and compressor frequency (the gear matching technology is relatively mature and belongs to the prior art, which will not be described in detail here), the rotation speed of the motor is adjusted to gradually increase from the minimum rotation speed within the range of this gear to the maximum rotation speed (for example, the preset range is F rpm). A total of 1 + F / 10 groups of noise data are tested when the rotation speed is stable. For example, the rotation speed range of this gear is [600, 650], F = 50, the rotation speed interval for each group of tests is 10 rpm, and the duration of each group of tests is 5 s. The noise data at 600, 610, 620, 630, 640, and 650 rpm are respectively tested, and the difference △A between the total noise value and the noise peak value of each noise data is calculated. x , in units of dB, using the rotation speed with the smallest difference △A x among the 6 groups of data as the final rotation speed of this gear, and update this rotation speed to the preset data gear library. When this gear is used again after the next startup, directly call the updated rotation speed value.

[0070] The fifth stage is the dynamic optimization of the final rotation speed of the motor gear. After the next startup, collect the noise △A x ' value of the current final rotation speed, and compare it with the △A x of the currently stored final rotation speed. If △A x ' ≤ △A x , then maintain the operation at this rotation speed; if △A x ' > △A x , then it is necessary to re-determine the final rotation speed of this gear.

[0071] The present invention realizes a method for adapting the gear speed of an air conditioner indoor unit and reducing noise. According to the characteristics of different motor manufacturers, the proprietary noise speeds of their respective motor manufacturers are found, the risk of abnormal noise is reduced, and the user comfort is improved. Based on the noise test, the proprietary gear speed ranges preset for each motor manufacturer under different working conditions are stored in the controller unit of the air conditioner, and the noise matching function of the motor manufacturer is set. During the installation and commissioning stage or when replacing the motor after-sales, the actual motor manufacturer used by the unit is matched through the air conditioner hand-held controller (remote control), and the corresponding speed range in the database is called. When using a certain gear for the first time, the optimal noise speed is ensured within the speed range of that gear, and further judgment is made whether to update when using that gear subsequently. The present invention can effectively reduce the risk of abnormal noise, improve the speed matching efficiency, and enhance the sound quality and user comfort of the air conditioner.

[0072] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A motor noise reduction control method, characterized in that, Including: Pre - test to obtain the noise speed corresponding to the abnormal noise emitted by the motor, and according to different working conditions of the equipment, divide the full - speed range of the motor into corresponding multiple gears, and the speed ranges corresponding to the gears after removing the noise speed, so as to form the gear - range information corresponding to the motor; When the equipment is started for the first time, obtain the corresponding gear - range information according to the identification code of the motor; When the motor runs in a certain gear under a certain working condition for the first time, within the speed range of this gear, adjust the speed of the motor according to the preset adjustment amplitude, and at the same time monitor and calculate the noise quantization value corresponding to the speed; Select the speed with the smallest noise quantization value within the speed range of this gear as the final speed of this gear under this working condition, and store it in the gear information.

2. The motor noise reduction control method according to claim 1, wherein The gear - range information includes various working conditions of the equipment, all gears of the motor corresponding to each working condition, and the speed ranges corresponding to each gear.

3. The motor noise reduction control method according to claim 1, characterized in that The gear information includes the final speed corresponding to each gear, the noise quantization value corresponding to the final speed, and the working condition corresponding to the noise quantization value.

4. The motor noise reduction control method according to claim 3, characterized in that, When the motor runs in a certain gear under a certain working condition not for the first time, then call the final speed of the corresponding gear under the current working condition to run, and at the same time monitor and calculate the noise quantization value of this gear. If the noise quantization value is greater than the corresponding noise quantization value in the gear speed table or the sum of the corresponding noise quantization value and the allowable error amplitude, then within the speed range of this gear, adjust the speed of the motor according to the preset adjustment amplitude, and at the same time monitor the noise quantization value corresponding to the speed, select the speed with the smallest noise quantization value within the speed range of this gear as the final speed of this gear, and update the final speed to the gear speed table.

5. The motor noise reduction control method according to claim 1, characterized in that, The test includes: Run the equipment under different working conditions, start testing the noise quantization value of the corresponding motor from its lowest speed. After each speed is tested, increase the preset adjustment amplitude once based on the current speed to form a new current speed and then continue to test the noise quantization value until the highest speed is tested; Regard the speed with the noise quantization value greater than the preset value as the noise speed corresponding to the abnormal noise emitted by the corresponding motor.

6. The motor noise reduction control method according to claim 1, wherein, The noise quantization value is obtained by monitoring the total noise value and the noise peak value, and then subtracting the noise peak value from the total noise value.

7. The motor noise reduction control method according to any one of claims 1 to 6, characterized in that, The equipment includes an air conditioner, and the working conditions of the equipment include at least one of nominal cooling, nominal heating, maximum cooling, maximum heating, dehumidification, and air supply.

8. The motor noise reduction control method according to claim 7, wherein, The difference between the lowest speed of the speed range of the higher gear and the highest speed of the speed range of the lower gear among any two adjacent gears is between 50 - 100 rpm.

9. The motor noise reduction control method according to claim 7, characterized in that, The preset adjustment amplitude is the minimum precision of the motor speed.

10. The motor noise reduction control method according to claim 7, wherein, The preset value of the noise quantization value is [15 dB, 20 dB].

11. An air conditioner, comprising an indoor unit, an outdoor unit, and a control device, characterized in that, The control device performs noise reduction control on the motor of the indoor unit fan according to the motor noise reduction control method according to any one of claims 1 to 10.

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