Motor noise reduction control method and air conditioner

Abstract

The application discloses a motor noise reduction control method and an air conditioner. The motor noise reduction control method comprises the following steps: obtaining noise rotating speeds corresponding to abnormal noises generated by a motor through pre-test, dividing a full rotating speed range of the motor into a plurality of corresponding gears according to different working conditions of the motor, and removing the noise rotating speeds corresponding to the gears to form gear interval information corresponding to the motor; when the motor is initially operated at a gear in a working condition, adjusting the rotating speed of the motor according to a preset adjustment range in the rotating speed range of the gear, and monitoring and calculating a noise quantitative value corresponding to the rotating speed; selecting a rotating speed with the minimum noise quantitative value in the rotating speed range of the gear as a final rotating speed of the gear in the working condition, and storing the final rotating speed to the gear information. The application can realize adaptive noise reduction of the motor.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of noise reduction, and in particular to a motor noise reduction control method capable of active noise reduction. BACKGROUND

[0002] Noise control is one of the key factors to improve the user experience and reliability of various mechanical and electrical 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] For example, ducted air conditioner indoor units, compact air handling units, high wind pressure ventilation equipment, etc. They generally use brushless direct current motors (BLDC) or similar high-efficiency motors with centrifugal fan blades or cross-flow fan blades. Although this combination is energy-efficient, it can easily excite electromagnetic noise (caused by motor magnetic field pulsation and slot effect), mechanical noise (such as bearing noise), and structural resonance noise of fan-motor shaft system, etc. These noises usually exhibit peak values in the low and medium frequency bands (e.g. concentrated below 2000Hz), which can seriously affect user comfort and even device reliability.

[0004] To solve such abnormal noise, existing devices using fans usually use the technical means of "disabling" the motor speed points that produce large noise in the device control program. That is, when setting the device operating gear (such as the air speed gear of an air conditioner), each gear is set to a safe speed point to avoid these known noise problems, so as to achieve the effect of noise reduction.

[0005] However, this prior art has the following problems:

[0006] First, it ignores the airflow path noise. The starting noise generated by airflow flowing through various components is also an important part of device noise. By disabling the motor speed point, only low-frequency vibration noise can be suppressed, and the medium and high-frequency noise problems (such as sharp whistling and turbulent hissing) caused by airflow dynamics itself cannot be effectively solved. In order to solve this problem, some devices do not use gear to adjust speed, but use real-time speed adjustment. By real-time noise monitoring, 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 a lot of controller resources, and the control cost is extremely high. Moreover, if the speed is changed at will without restrictions, it is difficult to match the user's target needs, and this is also not considered.

[0007] Second, there's a lack of adaptability to supplier differences. This is because different suppliers inherently differ in motor electromagnetic design, magnetic circuit structure, material selection (such as magnetic steel, silicon steel sheets, and insulation materials), mechanical structure (such as stator-rotor lamination, housing stiffness, and bearing selection), and production processes (such as dynamic balancing accuracy and assembly tolerance control). These differences directly lead to significant differences in the vibration and noise characteristics (including the frequency and amplitude of noise peaks, and corresponding "sensitive speed points") of the same model of equipment when equipped with motors from different suppliers. Therefore, the method of disabling a specific speed point cannot be applied to all devices of the same model.

[0008] Third, a single disabled speed point solution has poor compatibility. It's necessary to avoid not only the "disabled points" caused by vibration from each motor supplier, but also new "disabled points" or noise-degrading areas along the airflow path that may be caused by airflow variations driven by different motors. Finding a common speed combination that simultaneously avoids both the vibration noise of all motor suppliers' motors and the aerodynamic noise caused by the airflow they drive is nearly impossible.

[0009] Moreover, the above method only addresses the noise caused by the motor itself. The fan generates airflow, and the airflow flows from one component to another, causing other components to generate noise. These situations are not taken into consideration, resulting in poor noise reduction effect.

[0010] 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

[0011] In order to solve the technical problems in the prior art of relatively high noise reduction control cost, poor noise reduction flexibility, and poor noise reduction effect, the present invention proposes a motor noise reduction control method and an air conditioner.

[0012] The motor noise reduction control method proposed in the present invention includes:

[0013] The noise speed corresponding to the abnormal noise emitted by the motor is obtained through pre-testing. Based on the different working conditions of the equipment, the full speed range of the motor is divided into corresponding multiple gears, and the speed ranges with noise removed corresponding to the gears are formed to form the gear range information corresponding to the motor.

[0014] When the device is first started, the corresponding gear range information is obtained according to the motor identification code;

[0015] When the motor is initially operated in a certain gear under a certain working condition, the motor speed is adjusted according to a preset adjustment range within the speed range of the gear, and the noise quantization value of the corresponding speed is monitored and calculated at the same time;

[0016] The speed in the speed range of the gear with the minimum noise quantization value in the speed range is selected as the final speed of the gear in the working condition, and is stored in the gear information.

[0017] Further, the gear range information includes each working condition of the device, all gears of the motor corresponding to each working condition, and the speed range corresponding to each gear.

[0018] Further, 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.

[0019] Further, when the motor is not initially operated in a gear in a working condition, the final speed of the gear corresponding to the current working condition is called to operate, and the noise quantization value of the 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, the speed of the motor is adjusted according to the preset adjustment amplitude in the speed range of the gear, and the noise quantization value corresponding to the speed is monitored. The speed in the speed range of the gear with the minimum noise quantization value is selected as the final speed of the gear, and the final speed is updated in the gear speed table.

[0020] Further, the test includes:

[0021] The device is operated in different working conditions, and the corresponding motor is tested from the lowest speed to the noise quantization value. After each speed is tested, the current speed is increased by a preset adjustment amplitude to form a new current speed, and the noise quantization value is tested again until the highest speed is tested.

[0022] The speed with a noise quantization value greater than a preset value is taken as the noise speed corresponding to the abnormal noise of the corresponding motor.

[0023] Further, the preset adjustment amplitude is the minimum accuracy of the motor speed.

[0024] Further, 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.

[0025] Further, the device includes an air conditioner, and the working conditions of the device include at least one of nominal refrigeration, nominal heating, maximum refrigeration, maximum heating, dehumidification, and air supply.

[0026] Further, the difference between the lowest speed of the high gear in the speed range of any two adjacent gears and the highest speed of the low gear in the speed range is between 50-100 rpm.

[0027] Further, the preset value of the noise quantization value is [15dB, 20dB].

[0028] The air conditioner comprises an indoor unit, an outdoor unit and a control device, and the control device performs noise reduction control on the motor of the fan of the indoor unit according to the motor noise reduction control method in the technical solution.

[0029] The present application finds the noise speed of the motor of each manufacturer, removes the noise speed in the range of the selectable speed of the gear when the gear is set for the first time, so that the device can avoid the noise influence caused by the quality of the motor when the motor is applied to the specific device, and subsequently finds the final speed of the lowest noise of the gear, so as to realize the maximum noise reduction of the device. BRIEF DESCRIPTION OF DRAWINGS

[0030] The present application will be described in detail below with reference to the embodiments and the drawings.

[0031] Figure 1 is the main flowchart of an embodiment of the present application.

[0032] Figure 2 is a schematic table of gear interval information of an embodiment of the present application.

[0033] Figure 3 is a schematic table of gear interval information of another embodiment of the present application.

[0034] Figure 4 is a schematic table of gear information of an embodiment of the present application.

[0035] Figure 5 is a test flowchart of an embodiment of the present application.

[0036] Figure 6 is a flowchart of an application example of the present application. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects of the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0038] Therefore, one feature described in the specification will be used to explain one feature of one embodiment of the present application, and it is not implied that each embodiment of the present application must have the explained feature. In addition, it should be noted that the present specification describes many features. Although some features can be combined together to show possible system designs, these features can also be used in other combinations that are not explicitly described. Therefore, unless otherwise specified, the described combinations are not intended to be limiting.

[0039] As Figure 1As shown, in one basic embodiment, the motor noise reduction control method of the present application comprises the following main steps.

[0040] The noise speed corresponding to the abnormal noise generated by the motor is obtained through pre-test, and the full speed range of the motor is divided into corresponding multiple gears according to different working conditions of the equipment, and the speed range without the noise speed corresponding to each gear is obtained to form the gear interval information corresponding to the equipment and the motor. Taking an air conditioner as an example, the working conditions of the air conditioner can be air supply mode, refrigeration mode, heating mode, etc. The gears corresponding to different working conditions can be the same or different, and the speed ranges of the gears corresponding to different working conditions can be the same or different, which can be determined by the technical personnel according to the actual situation.

[0041] When the equipment is started for the first time, the corresponding gear interval information is obtained according to the identification code of the motor. The identification code of the motor can be the manufacturer of the motor, the model of the motor, or the combination of the two, or other identifiers of the same type of motor that can determine the noise speed.

[0042] When the motor is initially operated in a certain gear of a certain working condition, the speed of the motor is adjusted according to the preset adjustment range within the speed range of the gear, and the noise quantization value corresponding to the speed is monitored and calculated.

[0043] The speed with the smallest noise quantization value in the speed range of the gear is selected as the final speed of the gear of the working condition, and is stored in the gear information.

[0044] The present application avoids the noise speed in the speed range of the gear of the motor, i.e. removes the speed point at which the motor is prone to generate noise. When the motor is initially operated in a certain gear of a certain working condition, the speed with the lowest noise is searched in the relatively quiet speed range that has been screened, to serve as the final speed of a gear. The present application can set the speed range of the corresponding gear according to the requirements of the speed of the equipment to meet the needs of the user, and then search for the speed with the lowest noise in the speed range, which can achieve the purpose of meeting the needs of the user while meeting the noise requirements. Moreover, the final use mode of the present application is still a relatively fixed speed corresponding to a gear, although this speed can change dynamically according to the situation, but under normal circumstances, the gear and the corresponding final speed can be used to achieve the purpose of effective noise reduction. Compared with the real-time speed adjustment, the present application does not need to occupy a lot of control resources in real time in most cases.

[0045] For example, the noise speed of the motor is obtained through pre-test, and the full speed range of the motor is divided into corresponding multiple gears according to different working conditions of the equipment, and the speed range without the noise speed corresponding to each gear is obtained to form the gear interval information corresponding to the equipment and the motor. Figure 2In one embodiment, the gear interval information includes at least the working conditions of the device, all gears of the motor corresponding to each working condition, and the speed interval corresponding to each gear. In this case, the gear interval information of the motor corresponding to the device can be effectively recorded when the device has been installed with the corresponding motor. The gear of the specific device is determined according to the working condition of the device, and the rules are different according to different devices, which belongs to the prior art and will not be described in detail in the present application. In a specific application, a database or other means can be used to store the gear interval information of the motor of the device, which is convenient for subsequent updating.

[0046] Figure 2 The motor is set to gear 1 to gear n according to the needs of the device, and the value of n is determined according to the specific situation of the device. For example, the speed interval [R11 min ,R11 max ], where R11 min represents the minimum value of the speed interval of gear 1 of the motor corresponding to working condition 1 of the device, and R11 max represents the maximum value of the speed interval of gear 1 of the motor corresponding to working condition 1 of the device. For another example, the speed interval [Rin min ,Rin max ], where Rin min represents the minimum value of the speed interval of gear n of the motor corresponding to working condition i of the device, and Rin max represents the maximum value of the speed interval of gear n of the motor corresponding to working condition i of the device.

[0047] In other embodiments, the same device can use multiple motors, for example, device A can use motor a, motor b, or motor c. Therefore, the gear interval information can include the identification code of the motor corresponding to the device, the working conditions of the device, all gears of the motor corresponding to each working condition, and the speed interval corresponding to each gear. Figure 3 As shown, the same device can use multiple motors, and different types of motors are produced by different manufacturers, so they can be represented by manufacturer 1, manufacturer 2, …, and manufacturer m. The gears of different motors can be the same or different, Figure 3 As shown, all motors are set to the same gear from gear 1 to gear n according to the needs of the device. The speed interval of different working conditions of different motors can be different or the same, which is determined according to the actual situation. For example, the speed interval [R111 min ,R111 max ], where R111 min represents the minimum value of the speed interval of gear 1 of the motor corresponding to the corresponding manufacturer 1 corresponding to the working condition 1 of the device, and R111 maxRimn represents the maximum value of the speed interval of the corresponding motor of the corresponding manufacturer m, corresponding to the gear n, corresponding to the working condition i of the device. For example, the speed interval [Rimn min , Rimn max ], where Rimn min represents the minimum value of the speed interval of the corresponding motor of the corresponding manufacturer m, corresponding to the gear n, corresponding to the working condition i of the device. Rimn max represents the maximum value of the speed interval of the corresponding motor of the corresponding manufacturer m, corresponding to the gear n, corresponding to the working condition i of the device.

[0048] The same manufacturer can also generate similar different devices, and then the gear interval information can include the identification code of the device, the device of the motor, each working condition of the device, all gears of the corresponding motor of each working condition, and the corresponding speed interval of each gear.

[0049] The above various cases of gear interval information can be stored by means of a database or the like.

[0050] In a specific embodiment, 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.

[0051] Figure 4 One of the ways of storing the gear information is shown, and the final speed and noise quantization value corresponding to the working condition 1 and gear 1 are stored in pairs. R11 represents the currently stored final speed of the working condition 1 and gear 1, and when the device runs to the working condition 1 and needs to control the gear of the fan or other device to gear 1, the corresponding final speed can be directly called to reduce the occupied control resources. D11 represents the specific value of R11 selected as the final speed, and the corresponding noise quantization value. Subsequently, the noise quantization value can be monitored, and when an abnormal situation occurs, the final speed in R11 can be updated in time. Figure 4 Correspondingly, Rin represents the final speed corresponding to the gear n when the working condition i, and Din represents the noise quantization value corresponding to the final speed Rin currently stored in the working condition i and gear n.

[0052] The gear information and the gear interval information are preferably stored separately. The gear interval information is determined according to the design requirements of the equipment before the equipment is shipped, and each working condition is determined how many gears, and the allowable speed range of each gear to meet the specific needs of the user, and the noise speed can be the noise speed obtained by testing the single motor. This way is simple and can be applied to all motors of the same model shipped by the same manufacturer. The noise speed can also be tested after the motor is installed on the equipment or the corresponding parts of the equipment. This way can be applied to the same equipment shipped by the same manufacturer, and these same equipment use the same type of motor provided by the same supplier. Therefore, by storing the corresponding information of the motor that can be determined before shipment through the gear interval information, the time cost, storage cost and control cost can be effectively saved.

[0053] The gear information is an adaptive information that needs to be updated according to the situation. After being stored separately from the gear interval information, it is more conducive to updating and calling later, avoiding mutual interference of data.

[0054] Taking an air conditioner as an example, even if the same model of air conditioner is shipped by the same manufacturer, and even if the same model of motor produced by the same supplier is used, due to different installation environments, different pipe lengths, different pipe height differences and other factors, the final noise situation is also different. The gear information is the most suitable gear information for the current equipment situation obtained by adaptive adjustment when the equipment first uses a certain gear, so the noise resistance of the same hardware in different environments can be effectively improved.

[0055] In some embodiments, the gear information only needs to be updated once, and then the corresponding gear can be selected according to the working condition, and the fixed final speed of each gear can be directly called for control, which not only realizes effective noise reduction, but also reduces the control cost.

[0056] However, in some cases, as the use time accumulates, the condition of each part of the equipment will change more or less, so setting a fixed final speed for each speed cannot be applied to all situations, so in a further embodiment, when the motor is not initially running at a certain gear in a certain working condition, the final speed of the corresponding gear in the current working condition is called to run, and the noise quantization value of the 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, the speed of the motor is adjusted according to the preset adjustment amplitude within the speed interval of the gear, the noise quantization value of the corresponding speed is monitored, the speed with the smallest noise quantization value in the speed interval of the gear is selected as the final speed of the gear, and the final speed is updated to the gear speed table.

[0057] In the above embodiment, only the noise quantization value of the gear needs to be monitored, and when the noise quantization value is normal, the final rotating speed of the gear can be used, and only when the noise quantization value is abnormal, the final rotating speed of the gear is adjusted, which can adapt to the change of the environment and reduce the control cost in normal times.

[0058] As shown in Figure 5 , in one embodiment, the test can include the following contents.

[0059] Run the device under different working conditions, and test the noise quantization value of the corresponding motor from the lowest rotating speed. After testing each rotating speed, increase the preset adjustment amplitude based on the current rotating speed to form a new current rotating speed, and then continue to test the noise quantization value, until the highest rotating speed is tested.

[0060] Arrange each tested rotating speed and its noise quantization value, and take the rotating speed with a noise quantization value greater than the preset value as the corresponding noise rotating speed when the corresponding motor emits abnormal noise, so that when setting the gear of the motor or the product (such as a fan) where the motor is located, these noise rotating speeds can be removed.

[0061] When a device has multiple motors produced by different manufacturers, the motors of each manufacturer can be tested according to the steps of Figure 5 to find the noise rotating speed of the motor produced by the corresponding manufacturer.

[0062] In one embodiment, the preset adjustment amplitude is the minimum accuracy of the motor rotating speed. For example, when the minimum accuracy of the motor rotating speed is 10 rpm, the adjustment amplitude is 10 rpm. By testing each rotating speed through the minimum accuracy, all noise rotating speeds can be effectively excluded. Of course, the preset adjustment amplitude can also be set according to the needs of those skilled in the art.

[0063] In one embodiment, the noise quantization value of the present application 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.

[0064] There are many criteria for measuring noise, such as the frequency of noise, the peak value of noise, etc. The "total value of noise" usually refers to the equivalent continuous sound level Leq or other time period average energy, and the "peak value of noise" usually refers to the maximum instantaneous sound pressure level Lmax in a time period. The present application quantifies noise by subtracting the peak value of noise from the total value of noise, quickly and intuitively quantifies how much the peak event contributes to or raises the average noise level (total value) during the entire measurement period, helps to identify abnormal or significant transient noise events, and simplifies the perception of noise volatility / burstiness. For example, the larger the difference, the greater the interference of the peak event on the overall noise environment. A small difference means that the noise is relatively stable (the peak value is close to the average value). Since the noise speed is removed in advance in the present application, the difference should be relatively small under normal circumstances, but the difference should be relatively large under abnormal circumstances, so that the motor can be adaptively adjusted for noise reduction based on different environments after being applied to a specific device. In other embodiments, the calculation formula of the noise quantification value can be more complex, and the noise quantification value can have multiple terms, each term having a weight coefficient. The number of terms includes: the difference between the total value of noise and the peak value of noise, the number of occurrences of the peak value of noise, and the duration of the peak value of noise. By multiplying each term by its weight, and then adding all the terms, the corresponding noise quantification value can be obtained.

[0065] Those skilled in the art can also make adaptive adjustments based on this.

[0066] In one embodiment, the device referred to in the present application includes an air conditioner, but is not limited to an air conditioner. The working conditions of the air conditioner include at least one of nominal refrigeration, nominal heating, maximum refrigeration, maximum heating, dehumidification, and air supply.

[0067] When the present application is applied to an air conditioner, especially to an indoor unit of the air conditioner, the noise of the indoor unit can be effectively reduced, and a relatively quiet effect can be achieved under the premise of meeting the comfort needs of users.

[0068] When the present application is applied to a fan of an air conditioner, the difference between the lowest speed in the high-speed interval of the high gear and the highest speed in the low-speed interval of the low gear is between 50-100 rpm. There is a speed gradient between each gear, and the speed difference between gears is small, so that noise caused by large changes in gear speed can be avoided.

[0069] When applied to an air conditioner, the preset value of the noise quantification value of the noise speed during testing is [15dB, 20dB], and the noise of the indoor unit of the air conditioner is less than this range, so that the user has no obvious noise perception.

[0070] The application further protects an air conditioner, which comprises an indoor unit, an outdoor unit and a control device, and the control device performs noise reduction control on the motor of the fan of the indoor unit according to the motor noise reduction control method in the above technical solution.

[0071] As Figure 6 shown, in specific applications, the following stages can be included.

[0072] The first stage is to establish a corresponding database. For different use conditions of the air conditioner (such as refrigeration, heating, air supply, dehumidification, etc.), the noise matching test of the whole machine is performed for each motor manufacturer to determine the preset exclusive gear speed parameters. Specifically, the noise data of the air conditioner indoor unit is tested according to the national standard method, and the test is performed once every 10 rpm in the range of the lowest speed and the highest speed of the motor. The preset motor gear speed is referenced to the noise test results to ensure that the noise value meets the standard and the sound quality is normal. The total noise value meets the national standard limit requirement. To ensure that the noise quality is normal, further meet: total noise value-noise peak value≥X dB, X value [15, 20].

[0073] Each gear of the motor can be set with a range value, i.e. a speed interval [R min ,R max ], wherein the speed difference between the maximum speed and the minimum speed of the same gear is F, i.e. R max -R min =F, unit rpm; F is recommended to be 50. The speed span of adjacent gears, i.e. the difference between the minimum speed of the adjacent high gear and the maximum speed of the low gear, is between 50-100 rpm.

[0074] 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 exclusive gear speed parameters under each working condition, so as to be called in the subsequent stage.

[0075] The second stage can set the motor manufacturer noise matching function, set the motor manufacturer noise matching function for the indoor unit of the air conditioner, and match the initial gear for each manufacturer. The value of the speed is derived from the database in the controller. This function can be realized by entering the air conditioner hand controller (or remote controller) key, selecting and determining the actual motor manufacturer.

[0076] The third stage can execute the motor manufacturer noise matching function. In the installation and debugging stage or after the motor is replaced, the above function is used to call the corresponding gear interval information in the controller unit database.

[0077] The fourth stage is the optimization of motor gear speed. Since the previous three stages have set the speed gear range with better noise quality for the actual installed motor manufacturer, considering the influence of factors such as static pressure, wind resistance, and wind sweep plate angle in the installation environment, the motor noise characteristics may be different from the original design state. It is necessary to further optimize the speed within the speed range of the initial gear. Because the speed range is limited, the optimization efficiency is higher.

[0078] That is, when a certain gear is used for the first time under a certain working condition, the speed is optimized within the speed range of the gear and determined as the final 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 is running, when the user actively sets the gear, or the gear is automatically matched according to parameters such as the target temperature, system pressure, and compressor frequency (the gear matching technology is relatively mature and belongs to the existing technology, and will not be described in detail here), the speed of the motor is adjusted from the minimum speed within the range of the gear to the maximum speed (for example, the preset range is F rpm). A total of 1+F / 10 groups of noise data during stable speed operation are tested. For example, the speed range of the gear is [600,650], F=50, the speed interval of each test group is 10rpm, and each test group lasts for 5s. The noise data of 600, 610, 620, 630, 640, and 650rpm are tested respectively, and the difference △A between the total noise value and the noise peak value of each noise data is calculated. x , unit dB, the difference △A in 6 sets of data x The minimum speed is used as the final speed of this gear, and this speed is updated to the preset data gear library. The next time this gear is used after startup, the updated speed value is directly called.

[0079] The fifth stage is the dynamic optimization of the final speed of the motor gear. After restarting, the noise △A of the current final speed is collected. x 'value, and the △A of the current final speed that has been stored x For comparison, if △A x '≤△A x , then keep running at this speed; if △A x '>△A x , then you need to redetermine the final speed of the gear.

[0080] The application realizes the air conditioner indoor unit gear speed adaptation and noise reduction method, according to the characteristics of different motor manufacturers, find their own noise speed, reduce the risk of abnormal noise, improve user comfort. According to the noise test, the special gear speed range of each motor manufacturer under different working conditions is stored in the controller unit of the air conditioner, and the motor manufacturer noise matching function is set. During installation and debugging or after replacing the motor, the air conditioner hand controller (remote controller) is matched with the actual use of the motor manufacturer, and the corresponding speed range in the database is called. For the first time, ensure the optimal noise speed in the speed range of the gear, and further judge whether to update in the subsequent use of the gear. The application can effectively reduce the risk of abnormal noise, provide speed matching efficiency, improve the sound quality of air conditioner and user comfort.

[0081] The above only describes the preferred embodiments of the application and is not intended to limit the application. Any modification, equivalent replacement and improvement within the spirit and principle of the application should be included in the protection scope of the application.

Claims

1. A motor noise reduction control method, characterized in that: include: The noise speed corresponding to when the motor emits abnormal noise is obtained in advance through testing, and according to different working conditions of the equipment, the full speed range of the motor is divided into corresponding multiple gears, and the speed range with noise speed removed corresponding to the gears, so as to form gear range information corresponding to the motor, and the gear range information corresponding to each motor is stored in the equipment to form a corresponding database, wherein the gear range information includes each working condition of the equipment, all gears of the motor corresponding to each working condition, and the speed range corresponding to each gear; When the device is first started, the corresponding gear range information is obtained according to the motor identification code; When the motor is initially operated at a certain gear under a certain working condition, the motor speed is adjusted according to the minimum accuracy of the motor speed within the speed range of the gear, and the noise quantization value of the corresponding speed is monitored and calculated at the same time; 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; The speed with the smallest noise quantization value within the speed range of the gear is selected as the final speed of the gear under the working condition and stored in the gear information.

2. 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 operating condition corresponding to the noise quantization value.

3. The motor noise reduction control method according to claim 2, characterized in that: When the motor is not running in a certain gear of a certain working condition for the first time, the final speed of the gear corresponding to the current working condition is called to run, and the noise quantization value of the gear is monitored and calculated at the same time. 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, the speed of the motor is adjusted according to the preset adjustment amplitude within the speed range of the gear, and the noise quantization value of the corresponding speed is monitored at the same time. The speed with the smallest noise quantization value within the speed range of the gear is selected as the final speed of the gear, and the final speed is updated to the gear speed table.

4. The motor noise reduction control method according to claim 1, wherein: The tests include: Run the device under different working conditions and test the noise quantization value of the corresponding motor starting from its lowest speed. After each speed is tested, increase the preset adjustment amplitude based on the current speed. After forming the new current speed, continue to test the noise quantization value until the highest speed is tested. The speed at which the noise quantization value is greater than the preset value is used as the noise speed corresponding to when the corresponding motor emits abnormal noise.

5. The motor noise reduction control method according to any one of claims 1 to 4, characterized in that: The equipment includes an air conditioner, and the operating conditions of the equipment include at least one of nominal cooling, nominal heating, maximum cooling, maximum heating, dehumidification, and air supply.

6. The motor noise reduction control method according to claim 5, characterized in that: The difference between the lowest speed in the speed range of the high gear and the highest speed in the speed range of the low gear between any two adjacent gears is between 50-100 rpm.

7. The motor noise reduction control method according to claim 5, characterized in that: The preset value of the noise quantization value is [15dB, 20dB].

8. 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 a motor of a fan of an indoor unit according to the motor noise reduction control method according to any one of claims 1 to 7.

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