Fan coil motor noise reduction structure, method, asynchronous motor and air conditioning device

Abstract

The application provides a fan coil motor noise reduction structure and method, an asynchronous motor and an air conditioning device. The structure adds an audio collector on the motor body and adds a movable assembly on the output shaft of the motor. The movable assembly drives the fan blade to move forward and backward along the output shaft, thereby improving the axial distance between the fan blade and the volute, so as to eliminate the peak noise in the preset range of about 300 Hz, and solve the problem that the electromagnetic noise in a specific frequency range cannot be eliminated when the motor operates in the prior art.

Description

Technical Field

[0001] This invention relates to the field of motor noise reduction technology, specifically to a noise reduction structure, method, asynchronous motor, and air conditioning device for a fan coil motor. Background Technology

[0002] With the development of motor technology, the requirements for motor noise are becoming increasingly stringent. During the motor development process, screening and testing are required. Noise testing involves collecting the motor's noise spectrum in a noise room. Often, the motor is deemed unqualified due to the presence of peak noise levels. Therefore, reducing motor noise and resolving peak noise issues is a major challenge in the motor development process.

[0003] Currently, motor noise is affected by electromagnetic noise, bearing noise, and ventilation noise. Electromagnetic noise is the vibration and noise generated by the alternating electromagnetic force acting in the air gap between the stator and rotor of the motor. Because the air gap magnetic field contains not only the fundamental wave but also a series of higher harmonics, the interaction of these magnetic fields will generate periodic forces. Both the fundamental wave and the higher harmonic electromagnetic forces will cause vibration and noise. The frequency distribution of electromagnetic noise is mostly between 100-4000Hz. The intensity of vibration and noise is related to the magnitude of the electromagnetic force and the stiffness of the stator and rotor. When the electromagnetic force that excites vibration matches the natural frequency of the vibrating components, resonance will occur, and the vibration and noise will increase significantly. The electromagnetic force has radial and tangential components. The radial component of the electromagnetic force plays a major role in causing motor vibration and noise; it causes radial vibration of the stator core, and the noise generated by this radial vibration is the main component of the motor's electromagnetic noise. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned technical deficiencies and provide a noise reduction structure, method, asynchronous motor, and air conditioning device for fan coil motors, so as to solve the problem that electromagnetic noise in a specific frequency range during motor operation cannot be eliminated in related technologies.

[0005] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0006] According to a first aspect of the present invention, a noise reduction structure for a fan coil motor is provided, the fan coil motor including a motor body and an output shaft rotatably connected to the motor body, and further comprising:

[0007] An audio acquisition device is attached to the motor body to collect the noise during motor operation;

[0008] The movable component is fitted onto the output shaft and inserted into the rotating shaft of the fan blade;

[0009] The controller is used to control the active component to move the fan blade back and forth along the output shaft according to the peak noise frequency of the noise, thereby improving the axial distance between the fan blade and the volute.

[0010] Preferably, the movable component includes: a first control nut, a second control nut, and a fixing member clamped between the first control nut and the second control nut; wherein,

[0011] Both the first control nut and the second control nut have threads on their inner and outer sides. The outer thread is screwed into the shaft of the fan blade, and the inner thread is used to screw into the output shaft.

[0012] The output shaft is provided with an external thread that matches the internal thread.

[0013] Preferably, both the first control nut and the second control nut are provided with a telescopic rod;

[0014] The output shaft has a shaft hole for accommodating the telescopic rod.

[0015] Preferably, the telescopic rod includes:

[0016] A spring, a magnet disposed at the end of the spring, and a telescopic head disposed at the end of the magnet;

[0017] The spring is connected to a power source, the switch of which is connected to the controller, and the end face of the magnet faces the output shaft.

[0018] Preferably, there are multiple shaft holes, and the multiple shaft holes are arranged at equal intervals along the axial direction of the output shaft.

[0019] Preferably, the shaft holes are divided into two groups, with multiple holes in each group. One group is located at a position relative to the movable area of ​​the first control nut, and the other group is located at a position relative to the movable area of ​​the second control nut.

[0020] Preferably, the method further includes:

[0021] A distance sensor, mounted on the motor body, is used to measure the distance the fan blades move back and forth along the output shaft;

[0022] The controller is also used to control the rotational speed of the fan coil motor based on the distance.

[0023] According to a second aspect of the present invention, a method for noise reduction of a fan coil motor is provided, comprising:

[0024] Collect the noise from the motor during operation;

[0025] Based on the peak noise frequency, the movable component is controlled to move the fan blades back and forth along the output shaft of the fan coil motor, thereby improving the axial distance between the fan blades and the volute.

[0026] Preferably, if the movable component includes a telescopic rod, the control of the movable component to drive the fan blades to move back and forth along the output shaft of the fan coil motor includes:

[0027] If the detected peak noise frequency is within a preset frequency range, the telescopic rod is energized and retracted, while the motor rotates in a first direction. The movable component drives the fan blades to move away from the motor body, increasing the axial distance between the fan blades and the volute until the peak noise within the preset frequency range disappears; and / or,

[0028] The telescopic rod is energized and retracted, while the motor is rotated in the second direction. The movable component drives the fan blade to move towards the motor body, reducing the axial distance between the fan blade and the volute until the peak noise within the preset frequency range disappears. The second direction is opposite to the first direction.

[0029] Preferably, if the movable component includes a first control nut and a second control nut, the method further includes:

[0030] If the peak noise within the preset frequency range disappears, the telescopic rod is de-energized and extended. The telescopic head of the telescopic rod is locked in the shaft hole of the output shaft of the fan coil motor, and the first control nut and the second control nut are in a locked state.

[0031] Preferably, the method further includes:

[0032] The active component is controlled to move the fan blade by only one shaft hole spacing at a time, and the cumulative movement distance on one side does not exceed the limit value of movement on one side.

[0033] Preferably, the method further includes:

[0034] Measure the distance the fan blades move back and forth along the output shaft;

[0035] The rotational speed of the fan coil unit motor is controlled based on the distance.

[0036] According to a third aspect of the present invention, an asynchronous motor is provided, comprising:

[0037] The above-mentioned noise reduction structure for fan coil motors.

[0038] According to a fourth aspect of the present invention, an air conditioning device is provided, comprising:

[0039] The aforementioned asynchronous motor.

[0040] The technical solutions provided by the embodiments of the present invention may include the following beneficial effects:

[0041] By adding an audio acquisition unit to the motor body and a movable component to the motor output shaft, and by controlling the movable component to drive the fan blade to move back and forth along the output shaft, the axial distance between the fan blade and the volute is improved, thereby eliminating peak noise within a preset range of about 300Hz. This solves the problem that electromagnetic noise within a specific frequency range during motor operation cannot be eliminated in the existing technology. Attached Figure Description

[0042] Figure 1 This is an installation schematic diagram of a fan coil motor noise reduction structure according to an exemplary embodiment;

[0043] Figure 2 This is a partially enlarged view of a fan coil motor noise reduction structure according to an exemplary embodiment;

[0044] Figure 3 yes Figure 2 A partial cross-sectional schematic diagram;

[0045] Figure 4 This is a flowchart illustrating a method for noise reduction of a fan coil motor according to an exemplary embodiment. Detailed Implementation

[0046] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0047] Example 1

[0048] Figure 1 and Figure 2 This is an exemplary embodiment illustrating a noise reduction structure for a fan coil motor. The fan coil motor includes a motor body 2 and an output shaft 1 rotatably connected to the motor body 2, such as... Figure 1 and Figure 2 As shown, the structure includes:

[0049] The audio collector 7 is attached to the motor body 2 and is used to collect the noise when the motor is running.

[0050] The movable component 20 is sleeved on the output shaft 1 and inserted into the rotating shaft of the fan blade 4;

[0051] The controller is used to control the movable component 20 to drive the fan blade 4 to move back and forth along the output shaft 1 according to the peak noise frequency of the noise, thereby improving the axial distance between the fan blade 4 and the volute 3.

[0052] In practice, the controller can be one or more of the following: microcontroller, ARM processor, DSP processor, FPGA controller, and PLC controller.

[0053] The audio acquisition unit 7 can be installed inside the electrical box on the motor body 2, which can protect it from dust and impacts, thus extending its service life. Additionally, Figure 1 In the middle, 5 is the motor base, used to install the fan coil motor; 6 is the base plate, used to install the fan coil motor, fan blades 4, and volute 3.

[0054] In the technical solution provided in this embodiment, the output shaft 1 of the fan coil unit motor can be either two or one. Figure 1 The fan coil motor shown has two symmetrical output shafts 1 on the left and right, and one of the movable components 20 can be installed on each output shaft 1.

[0055] It should be noted that the "forward and backward movement" mentioned in this embodiment refers to movement relative to the motor body 2. Moving away from the motor body 2 means moving forward, and moving closer to the motor body 2 means moving backward.

[0056] It should be noted that the motor stator core is thin-walled and ring-shaped with poor rigidity, which will cause vibration and result in poor sound quality. Experiments in a noise room have shown that by adjusting the axial distance between the fan blade 4 and the volute 3, the peak noise within the preset range of about 300Hz can be eliminated.

[0057] Guided by this inventive concept, the technical solution provided in this embodiment adds an audio acquisition device 7 to the motor body 2 and a movable component 20 to the output shaft 1 of the motor. By controlling the movable component 20 to drive the fan blade 4 to move back and forth along the output shaft 1, the axial distance between the fan blade 4 and the volute 3 is improved, thereby eliminating peak noise within a preset range of about 300Hz. This solves the problem that electromagnetic noise within a specific frequency range during motor operation cannot be eliminated in the prior art.

[0058] Specifically, see Figure 2 The movable component 20 includes: a first control nut 21, a second control nut 22, and a fixing member 23 clamped between the first control nut 21 and the second control nut 22; wherein,

[0059] The first control nut 21 and the second control nut 22 are both threaded inside and out. The external thread is screwed into the rotating shaft of the fan blade 4, and the internal thread is used to screw into the output shaft 1.

[0060] The output shaft 1 is provided with an external thread that matches the internal thread.

[0061] It is understandable that the fan blade 4 is screwed to the outside of the movable component 20, and the motor output shaft 1 is screwed to the inside of the movable component 20. When the motor output shaft 1 rotates, the position of the movable component 20 changes, which in turn causes the position of the fan blade 4 to change, while the position of the volute 3 remains unchanged, thereby changing the axial distance between the fan blade 4 and the volute 3.

[0062] Preferably, both the first control nut 21 and the second control nut 22 are provided with a telescopic rod 10;

[0063] The output shaft 1 has a shaft hole 11 for accommodating the telescopic rod 10.

[0064] It is understandable that the telescopic rod 10 and the shaft hole 11 are designed for limiting movement. Without the telescopic rod 10 and shaft hole 11, when the fan blade 4 rotates, the position of the movable component 20 on the motor output shaft 1 would be unstable, easily causing the fan blade 4 to fly off the output shaft 1 and damage it. By moving the position of the movable component 20 back and forth, and eliminating the 300Hz peak noise, the telescopic rod 10 is inserted into the shaft hole 11 to limit the position of the movable component 20, thereby fixing the position of the fan blade 4 relative to the motor output shaft 1 and maintaining the stability and reliability of the entire machine structure.

[0065] Further, see Figure 3 The telescopic rod 10 includes:

[0066] A spring, a magnet disposed at the end of the spring, and a telescopic head disposed at the end of the magnet;

[0067] The spring is connected to a power source, the switch of which is connected to the controller, and the end face of the magnet faces the output shaft 1.

[0068] It is understandable that the individual turns of the spring do not contact or are insulated from each other. When the spring is energized, it is equivalent to a solenoid, with each turn of the spring acting as a circular current, and the current in each turn flowing in the same direction. Based on the principle that currents in the same direction attract each other, each turn of the spring attracts its adjacent spring, causing the entire spring to contract. When the spring contracts, it causes the magnet at the end to contract as well. After the magnet contracts, the telescopic head moves away from the shaft hole 11 on the motor output shaft 1. After the movable component 20 is released from its limit position, when the motor output shaft 1 rotates, since the movable component 20 is screwed onto the output shaft 1, it can move back and forth along the motor output shaft 1, thereby changing the axial distance between the fan blade 4 and the volute 3.

[0069] Preferably, there are multiple shaft holes 11, and the multiple shaft holes 11 are arranged at equal intervals along the axial direction of the output shaft 1.

[0070] It is understood that the multiple shaft holes 11 are arranged at equal intervals along the axial direction of the output shaft 1, so that the movable component 20 can move only one shaft hole 11 spacing position at a time. After moving one shaft hole 11 spacing position, it is determined whether the peak noise in the preset range of about 300Hz has been eliminated, and then the position is moved again, thereby achieving precise noise reduction, avoiding the time waste caused by the need for reversal after over-adjustment, and improving noise reduction efficiency.

[0071] In practice, the spacing between the shaft holes 11 is set according to historical experience or experimental data, for example, it is set to 3mm.

[0072] Preferably, the shaft hole 11 is divided into two groups, with multiple holes in each group. One group is located at a position relative to the active area of ​​the first control nut 21, and the other group is located at a position relative to the active area of ​​the second control nut 22.

[0073] It is understandable that the position adjustment of the movable component 20 is limited. Therefore, a shaft hole 11 needs to be set at the relative position of the movable area of ​​the first control nut 21, and a shaft hole 11 also needs to be set at the relative position of the movable area of ​​the second control nut 22. In this way, when the limit is reached, the telescopic rod 10 in the first control nut 21 and the telescopic rod 10 in the second control nut 22 are simultaneously limited, ensuring the reliability of the limit.

[0074] Specifically, assuming the limit value for unilateral movement is set to 6mm, that is, the maximum forward movement along the output shaft 1 of the motor is 6mm, and the maximum backward movement along the output shaft 1 of the motor is 6mm. Assuming the spacing between the shaft holes 11 is 3mm, then 5 shaft holes 11 need to be set at the position relative to the moving area of ​​the first control nut 21, and 5 shaft holes 11 need to be set at the position relative to the moving area of ​​the second control nut 22.

[0075] Taking the telescopic rod 10 of the first control nut 21 as an example, when resetting, the telescopic rod 10 is inserted into the middle shaft hole 11. When it needs to move, the two shaft holes 11 on the left ensure a maximum movement distance of 6mm, and the two shaft holes 11 on the right ensure a maximum movement distance of 6mm.

[0076] Preferably, it further includes: a distance sensor, disposed on the motor body 2, for measuring the distance the fan blade 4 moves back and forth along the output shaft 1;

[0077] The controller is also used to control the rotational speed of the fan coil motor based on the distance.

[0078] In practice, the ranging sensor can be an infrared sensor.

[0079] It is understood that the technical solution provided in this embodiment can control the speed of the fan coil motor based on the detected distance of the fan blade 4 moving back and forth along the output shaft 1, thereby achieving fine adjustment of the axial distance between the fan blade 4 and the volute 3, which can further improve the adjustment efficiency and shorten the adjustment time.

[0080] Example 2

[0081] Figure 4 This is a flowchart illustrating a noise reduction method for a fan coil motor according to an exemplary embodiment, such as... Figure 4 As shown, the structure includes:

[0082] Step S11: Collect the noise of the motor during operation;

[0083] Step S12: Based on the peak noise frequency of the noise, control the movable component to drive the fan blade to move back and forth along the output shaft of the fan coil motor, thereby improving the axial distance between the fan blade and the volute.

[0084] It should be noted that the technical solution provided in this embodiment is applicable to the fan coil motor noise reduction structure in the above embodiments, and in specific practice, it is loaded and runs in the motor controller.

[0085] It is understood that the technical solution provided in this embodiment, by adding an audio acquisition device to the motor body and a movable component to the output shaft of the motor, and by controlling the movable component to drive the fan blade to move back and forth along the output shaft, improves the axial distance between the fan blade and the volute, thereby eliminating peak noise within a preset range of about 300Hz, and solves the problem that electromagnetic noise within a specific frequency range during motor operation cannot be eliminated in the prior art.

[0086] In practical application, if the movable component includes a telescopic rod, step S12, which involves controlling the movable component to drive the fan blades to move back and forth along the output shaft of the fan coil motor, includes:

[0087] If the detected peak noise frequency is within a preset frequency range, the telescopic rod is energized and retracted, while the motor rotates in a first direction. The movable component drives the fan blades to move away from the motor body, increasing the axial distance between the fan blades and the volute until the peak noise within the preset frequency range disappears; and / or,

[0088] The telescopic rod is energized and retracted, while the motor is rotated in the second direction. The movable component drives the fan blade to move towards the motor body, reducing the axial distance between the fan blade and the volute until the peak noise within the preset frequency range disappears. The second direction is opposite to the first direction.

[0089] It should be noted that the motor stator core is a thin-walled ring with poor rigidity, which causes vibration and results in poor sound quality. Experiments in a noise chamber have shown that adjusting the axial distance between the fan blades and the volute can eliminate the 300Hz peak noise. Therefore, the "preset frequency range" mentioned in this embodiment refers to a preset range of approximately 300Hz, for example, the range of 280Hz to 320Hz.

[0090] Experiments have shown that when eliminating noise, the motor is generally controlled to rotate in the first direction, for example, the motor rotates forward. The moving component drives the fan blade to move away from the motor body, and the axial distance between the fan blade and the volute increases until the peak noise in the preset frequency range disappears.

[0091] Alternatively, the motor can be controlled to rotate in a second direction, such as in reverse. The moving component drives the fan blades to move toward the motor body, reducing the axial distance between the fan blades and the volute until the peak noise within the preset frequency range disappears.

[0092] You can also control the motor to rotate in the first direction first, and then in the second direction, or control the motor to rotate in the second direction first, and then in the first direction, until the peak noise within the preset frequency range disappears.

[0093] It is understood that the technical solution provided in this embodiment uses multiple means to control the axial distance between the fan blade and the volute, so that the distance between the fan blade and the motor can be flexibly adjusted, and the distance between the fan blade and the volute can be controlled, thereby achieving the effect of eliminating the 300Hz peak noise generated when the motor is running. It is simple to operate, has low noise reduction cost, and provides a good user experience.

[0094] Furthermore, if the movable component includes a first control nut and a second control nut, the method further includes:

[0095] If the peak noise within the preset frequency range disappears, the telescopic rod is de-energized and extended. The telescopic head of the telescopic rod is locked in the shaft hole of the output shaft of the fan coil motor, and the first control nut and the second control nut are in a locked state.

[0096] Understandably, the telescopic rod and shaft hole are designed for limiting movement. Without them, the position of the moving component on the motor output shaft would be unstable during fan rotation, easily causing the fan blade to fly off the shaft and damage it. By moving the moving component back and forth to eliminate the 300Hz peak noise, the telescopic rod is inserted into the shaft hole to limit its position, thereby fixing the fan blade's position relative to the motor output shaft and maintaining the stability and reliability of the entire machine structure.

[0097] Furthermore, the method also includes:

[0098] The active component is controlled to move the fan blade by only one shaft hole spacing at a time, and the cumulative movement distance on one side does not exceed the limit value of movement on one side.

[0099] It is understood that the multiple shaft holes are arranged at equal intervals along the axial direction of the output shaft, which allows the movable component to move only one shaft hole spacing position at a time. After each shaft hole spacing position is moved, it is determined whether the 300Hz peak noise has been eliminated before the position is moved again, thereby achieving precise noise reduction and avoiding the time waste caused by the need for reversal after over-adjustment, thus improving noise reduction efficiency.

[0100] In practice, the spacing between the shaft and the hole is set based on historical experience or experimental data, for example, 3mm. The limit value for unilateral movement can be set to 6mm.

[0101] Preferably, the method further includes:

[0102] Measure the distance the fan blades move back and forth along the output shaft;

[0103] The rotational speed of the fan coil unit motor is controlled based on the distance.

[0104] It is understood that the technical solution provided in this embodiment can control the speed of the fan coil motor based on the detected distance the fan blade moves back and forth along the output shaft, thereby achieving fine adjustment of the axial distance between the fan blade and the volute, which can further improve the adjustment efficiency and shorten the adjustment time.

[0105] Example 3

[0106] An asynchronous motor, according to an exemplary embodiment, includes:

[0107] The above-mentioned noise reduction structure for fan coil motors.

[0108] It is understood that the technical solution provided in this embodiment includes the above-mentioned fan coil motor noise reduction structure. This noise reduction structure adds an audio collector to the motor body and a movable component to the output shaft of the motor. By controlling the movable component to drive the fan blade to move back and forth along the output shaft, the axial distance between the fan blade and the volute is improved, thereby eliminating peak noise in a preset range of about 300Hz. This solves the problem that electromagnetic noise in a specific frequency range during motor operation cannot be eliminated in the prior art.

[0109] Example 4

[0110] An air conditioning device according to an exemplary embodiment includes:

[0111] The aforementioned asynchronous motor.

[0112] It is understood that the technical solution provided in this embodiment includes the above-mentioned fan coil motor noise reduction structure. This noise reduction structure adds an audio collector to the motor body and a movable component to the output shaft of the motor. By controlling the movable component to drive the fan blade to move back and forth along the output shaft, the axial distance between the fan blade and the volute is improved, thereby eliminating peak noise in a preset range of about 300Hz. This solves the problem that electromagnetic noise in a specific frequency range during motor operation cannot be eliminated in the prior art.

[0113] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0114] If the integrated units in the above embodiments are implemented as software functional units and sold or used as independent products, they can be stored in the aforementioned computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause one or more computer devices (which may be personal computers, servers, or network devices, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application.

[0115] In the above embodiments of this application, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0116] In the several embodiments provided in this application, it should be understood that the disclosed client can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces, indirect coupling or communication connection between units or modules, and may be electrical or other forms.

[0117] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0118] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0119] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A noise reduction structure for a fan coil motor, the fan coil motor comprising a motor body and an output shaft rotatably connected to the motor body, characterized in that, Also includes: An audio acquisition device is attached to the motor body to collect the noise during motor operation; The movable component is fitted onto the output shaft and inserted into the rotating shaft of the fan blade; The controller is used to control the movable component to move the fan blade back and forth along the output shaft according to the peak noise frequency of the noise, thereby improving the axial distance between the fan blade and the volute. The movable component includes: a first control nut, a second control nut, and a fixing member clamped between the first control nut and the second control nut; wherein... Both the first control nut and the second control nut have threads on their inner and outer sides. The outer thread is screwed into the rotating shaft of the fan blade, and the inner thread is used to screw into the output shaft. The output shaft is provided with an external thread that matches the internal thread. Both the first and second control nuts are equipped with telescopic rods. The output shaft has a shaft hole for accommodating the telescopic rod.

2. The fan coil unit motor noise reduction structure according to claim 1, characterized in that, The telescopic rod includes: A spring, a magnet disposed at the end of the spring, and a telescopic head disposed at the end of the magnet; The spring is connected to a power source, the switch of which is connected to the controller, and the end face of the magnet faces the output shaft.

3. The fan coil unit motor noise reduction structure according to claim 1, characterized in that, There are multiple shaft holes, and the multiple shaft holes are arranged at equal intervals along the axial direction of the output shaft.

4. The fan coil unit motor noise reduction structure according to claim 3, characterized in that, The shaft holes are divided into two groups, with multiple holes in each group. One group is located at a position relative to the movable area of ​​the first control nut, and the other group is located at a position relative to the movable area of ​​the second control nut.

5. The fan coil unit motor noise reduction structure according to claim 1, characterized in that, Also includes: A distance sensor, mounted on the motor body, is used to measure the distance the fan blades move back and forth along the output shaft; The controller is also used to control the rotational speed of the fan coil motor based on the distance.

6. A method for reducing noise in a fan coil motor, applied to the fan coil motor noise reduction structure as described in claim 5, characterized in that, include: Collect the noise from the motor during operation; Based on the peak noise frequency, the movable component is controlled to move the fan blades back and forth along the output shaft of the fan coil motor, thereby improving the axial distance between the fan blades and the volute.

7. The method according to claim 6, characterized in that, If the movable component includes a telescopic rod, controlling the movable component to drive the fan blades to move back and forth along the output shaft of the fan coil motor includes: If the detected peak noise frequency is within a preset frequency range, the telescopic rod is energized and retracted, while the motor rotates in a first direction. The movable component drives the fan blades to move away from the motor body, increasing the axial distance between the fan blades and the volute until the peak noise within the preset frequency range disappears; and / or, The telescopic rod is energized and retracted, while the motor is rotated in the second direction. The movable component drives the fan blade to move towards the motor body, reducing the axial distance between the fan blade and the volute until the peak noise within the preset frequency range disappears. The second direction is opposite to the first direction.

8. The method according to claim 7, characterized in that, If the movable component includes a first control nut and a second control nut, the method further includes: If the peak noise within the preset frequency range disappears, the telescopic rod is de-energized and extended. The telescopic head of the telescopic rod is locked in the shaft hole of the output shaft of the fan coil motor, and the first control nut and the second control nut are in a locked state.

9. The method according to claim 7, characterized in that, Also includes: The active component is controlled to move the fan blade by only one shaft hole spacing at a time, and the cumulative movement distance on one side does not exceed the limit value of movement on one side.

10. The method according to any one of claims 6 to 9, characterized in that, Also includes: Measure the distance the fan blades move back and forth along the output shaft; The rotational speed of the fan coil unit motor is controlled based on the distance.

11. An asynchronous motor, characterized in that, include: The noise reduction structure for fan coil motors according to any one of claims 1 to 5.

12. An air conditioning device, characterized in that, include: The asynchronous motor according to claim 11.

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