202 results about "Motor noise" patented technology

The invention discloses a motor abnormal sound detection method and system based on contact acquisition and small sample learning, and the method comprises the steps: directly coupling a motor housing through a contact vibration sensor, collecting an original vibration signal, and generating an anti-interference vibration signal; inputting the anti-interference vibration signal into a nonlinear resonance enhancement module to generate an enhanced sound signal; performing wavelet packet decomposition on the enhanced sound signal, extracting a multi-scale frequency band energy entropy, and generating a motor abnormal sound feature matrix by combining singular value decomposition dimension reduction; on the basis of a dynamic weight distribution element learning algorithm, a small number of normal samples and abnormal samples are utilized to construct an abnormal sound classification model; and inputting the motor abnormal sound characteristic matrix into an abnormal sound classification model, detecting transient abnormality through a sliding window time sequence matching algorithm, and outputting an abnormal sound judgment result. According to the embodiment of the invention, high-precision and low-false-alarm motor abnormal sound detection under complex working conditions can be realized.

The invention discloses a fault prediction method and system based on motor noise, and the method comprises the steps: 1, defining a sampling time length, obtaining the noise in the sampling time length, and carrying out the framing operation to generate a noise frame sequence; 2, extracting spectrum feature data of each frame of noise in the noise frame sequence to generate a noise feature sequence; 3, inputting the noise feature sequence into a self-attention neural network model, and outputting a noise representation sequence by the self-attention neural network model; 4, acquiring a set composed of samples of the standard fault noise of the motor, generating a feature vector of each sample, performing cross attention mechanism calculation with the noise representation sequence, and generating a judgment representation of a fault corresponding to each sample; and 5, inputting the judgment representation of the fault corresponding to each sample into the feedforward neural network model to generate the judgment probability of each fault, thereby realizing accurate judgment of the working state of the motor, and simultaneously judging multiple fault types under the condition of not increasing the calculation amount.

The utility model discloses a vibrating water pump, and belongs to the technical field of water pumps. The technical problems that an existing water pump is large in size, complex in structure and large in motor operation noise are solved. According to the technical scheme, the water purifier is characterized by comprising a shell, a one-way valve, a vibrator, a diaphragm and a rigid support, the vibrator is installed on the diaphragm to provide diaphragm vibration energy, the diaphragm is fixed in the shell through the rigid support and divides the shell into a water inlet area and a water outlet area, and the one-way valve is further fixed to the rigid support; the one-way valve is communicated with the water inlet area and the water outlet area and keeps water flowing into the water outlet area from the water inlet area in a one-way mode. The water purifier has the advantages of being long in service life, easy to overhaul, adjustable in power and convenient to use.

The invention discloses a motor noise detection method and system based on waveform analysis, and relates to the related field of motor fault diagnosis, and the method comprises the steps: carrying out the time domain collection of an original noise signal during the operation of a motor, obtaining an original waveform signal, carrying out the Fourier transform of the original waveform signal, extracting the spectrum characteristics, and obtaining the spectrum energy distribution; performing threshold segmentation on the frequency spectrum energy distribution, screening out motors which meet a preset quality standard but have preset abnormal indications, and obtaining critical qualified motors; extracting an original waveform signal of the critically qualified motor, and extracting a transient impact component from the original waveform signal to obtain a transient feature; and matching the transient feature with an early fault mode in a pre-constructed fault feature library, and outputting a potential fault detection result. The technical problem that the current qualified motor with potential faults cannot be identified in the existing motor noise detection is solved, and the technical effect of accurately identifying the qualified motor with the potential faults is achieved.

The invention discloses a high-precision identification method and system for a noise source of an asynchronous motor, and relates to the technical field of asynchronous motor detection, and the method comprises the following steps: constructing a finite element model of a to-be-analyzed asynchronous motor, dividing the surface into a plurality of detection sub-regions, and carrying out the operation simulation of the finite element motor, analyzing vibration speed and sound pressure signal data of each sub-region, synchronously acquiring actual signals, calculating relative differences with simulation data, evaluating detection priorities by combining historical fault times, forming a detection sequence according to the priorities, and sequentially performing sound-vibration coherence analysis and coherence function calculation to obtain a sound-vibration coherence detection result; according to the method, noise frequency bands are classified into structural noise and air noise, order tracking analysis is performed on the structural noise obtained through classification, an amplitude stability index and an amplitude change gradient are calculated, automatic classification and identification of electromagnetic noise and mechanical noise are realized based on a preset threshold value, and the efficiency and accuracy of fault processing are remarkably improved.

The invention discloses a motor, a compressor and refrigeration equipment, and relates to the technical field of refrigeration equipment, the number of poles of a rotor is 2P, the number of stator slots is Q, the longest distance between the slot bottom of a first magnetic adjusting slot and the circle center of a stator punching sheet is Ls, and the minimum inner diameter of the stator punching sheet is Di, the included angle between the connecting line of the point A and the circle center of the stator punching sheet and the center line in the length direction of the stator tooth is alpha, the two farthest end points of the tooth boot part along the circumferential direction of the stator punching sheet are respectively a point B and a point C, the included angle between the connecting line of the point B and the circle center of the stator punching sheet and the connecting line of the point C and the circle center of the stator punching sheet is beta, 0 degree < = 1.27 degrees, and 0 mm < = 0.2 mm. According to the technical scheme provided by the invention, the torque ripple of the motor is reduced, the noise of the motor is reduced, and the energy efficiency of the motor is improved.

The application relates to the technical field of motor noise reduction, in particular to a motor noise reduction method for a portable fan. The handheld fan is internally provided with a driving motor. The method comprises the following steps: obtaining motor noise generated by the portable fan during operation; the motor noise comprises mechanical vibration noise, electromagnetic noise and aerodynamic noise of the driving motor; when the signal strength of the motor noise is greater than a preset strength threshold, generating a noise control instruction based on the motor noise; generating and emitting noise reduction signals for the mechanical vibration noise, the electromagnetic noise and the aerodynamic noise based on the noise control instruction, so as to perform destructive interference on the motor noise. The motor operation noise level is reduced through active noise reduction and accurate processing of the fan motor noise.

The invention relates to the technical field of propulsion motor noise control, in particular to a propulsion motor noise control method based on short-time Fourier transform, and the method comprises the following steps: S1, collecting a vibration signal during the operation of a ship propulsion motor through a sensor, and obtaining a signal sequence; s2, converting the signal sequence into a time-frequency two-dimensional signal sequence by adopting short-time Fourier transform; and S3, obtaining an output signal by processing the time-frequency two-dimensional signal sequence. The propulsion motor noise control method based on short-time Fourier transform can continuously monitor the noise level of the motor during the operation period through combining the advantages of the sum, and quickly adjust the control strategy according to real-time feedback, thereby achieving the purpose of automatically regulating and controlling the noise, effectively reducing the operation noise of the motor, facilitating the reduction of the structural fatigue, and improving the reliability of the propulsion motor. The service life of equipment is prolonged, so that the long-term maintenance cost is reduced.

The invention relates to a wiper structure capable of reducing wind resistance lifting force, and belongs to the technical field of wipers, the wiper structure comprises a wiper and a wiper arm, the wiper arm comprises a wiper rod and a connecting piece on one side of the wiper rod, and the connecting piece is provided with a second windward side and a third windward side. According to analysis and verification, the pressure coefficient of an original windscreen wiper is designed to be 17n / m, after the wind lifting force is reduced through a new structure, the downward pressure of the windscreen wiper can be designed to be about 12N / m, the pressure of the windscreen wiper is greatly reduced, and therefore the purposes of reducing the sound generated when the windscreen wiper is used for brushing glass and reducing the noise generated when the windscreen wiper is used for brushing the glass are achieved. And meanwhile, the downward pressure of the wiper arm is small, the load of the wiper motor is reduced, so that the noise of the wiper motor is reduced, the size and the power of the motor can be reduced by reducing the load of the motor, the power consumption of the wiper can also be reduced, and the effects of energy conservation and emission reduction are achieved.

A built-in tangential mixed magnetic steel magnetism gathering type permanent magnet rotor relates to the technical field of motors, the rotor comprises a rotor iron core and a rotating shaft, the rotor iron core is provided with a plurality of permanent magnet units which are symmetrically arranged around the axis of the rotor iron core, and the permanent magnet rotor is characterized in that each permanent magnet unit comprises a middle magnetic steel, middle air permanent magnet grooves and radial magnetic steel are arranged between the adjacent permanent magnet units, the middle air permanent magnet grooves and the radial magnetic steel are arranged on the q shaft, the middle air permanent magnet grooves are arranged on the inner sides of the radial magnetic steel, and the middle magnetic steel and the adjacent radial magnetic steel on the two sides of the middle magnetic steel are arranged in a U shape. The rotor provided by the utility model can reduce motor noise and torque ripple.

The invention relates to a low-wind-noise wind wheel structure, a fan assembly and a dehumidifier, a wind wheel comprises a support, the support comprises a hub, a mounting part and a flow guide part connected between the hub and the mounting part, the flow guide part and the mounting part are both located on the air inlet side of the wind wheel, the flow guide part is in a hollow circular truncated cone shape, and a containing cavity for at least containing part of a motor is defined by the flow guide part; the mounting part is used for mounting a driving shaft of the motor; and the inner ends of the blades are connected to the circumferential outer surface of the hub. According to the low-wind-noise wind wheel structure, the fan assembly and the dehumidifier, the flow guide part with the specific through-flow opening is arranged in the wind wheel, airflow organization in the wind wheel is optimized, airflow is more regular and smoother when entering the containing cavity and acting with the blades, and pneumatic noise is effectively reduced while the air volume is increased; meanwhile, the motor can be partially wrapped by the containing cavity formed by the flow guide part, and leakage of noise of the motor is reduced.

The invention relates to the technical field of foaming materials, in particular to a polyurethane foaming material for motor noise reduction and a preparation method thereof.The preparation method comprises the steps that part of an amine catalyst and polyol mixture, a foaming agent, a metal catalyst, a surfactant, expanded graphite, an anti-aging agent and the like are mixed, and a first component is obtained; isocyanate and the first component are subjected to high-pressure mixing according to a preset proportion, and a mixed system is obtained; and injecting the mixed system into a mold, carrying out gradient foaming to obtain a foaming body, carrying out surface hot pressing twice, and carrying out product curing and cutting to obtain a finished product of the motor wrapping part. The polyurethane foam material provided by the invention simultaneously meets the requirements of medium-high frequency sound absorption, vibration damping and oil stain protection.

The invention discloses a roller shutter equipment, a motor and a brake device, The brake device is used for braking motor rotor. The brake device includes a permanent magnet and a magnetic conductor, one of the permanent magnet and the magnetic conductor is used for connecting the motor rotor and the other one is used for connecting the motor stator. The permanent magnet includes N magnetic poles, the magnetic conductor includes N slots, the brake device constitutes a N poles N slots structure, where N is an integer greater than 1. The brake device is applied to motor and roller shutter equipment, it realizes rapid braking, at the same time it can effectively reduce the vibration frequency of the motor and avoid the vibration frequency of the cover shell of the roller shutter equipment. It avoids resonance, ensures normal operation of the motor and reduces motor noise during operation.

The utility model relates to the technical field of motor middle plates, in particular to a grounding middle plate with a novel structure, which comprises a middle plate frame, a power connection terminal mounting rack and a power connection terminal slot, the outer end of the middle plate frame is provided with a grounding terminal mounting rack, the inner side of the grounding terminal mounting rack is provided with a grounding terminal slot, and the grounding terminal slot is provided with a grounding terminal. An alignment column is arranged at the position, close to the power connection terminal installation frame, of the upper side of the middle plate frame, an alignment hole is formed in the outer side of the middle plate frame, a middle plate hole is formed in the upper side of the middle plate frame, and an elastic arm installation groove is formed in the position, close to the power connection terminal installation frame, of the inner side of the middle plate hole. And a grounding terminal main body is mounted in the grounding terminal slot. According to the utility model, the grounding terminal main body is mounted through the grounding terminal mounting rack and is used for connecting the grounding wire, so that the connection of the grounding wire is firmer, the convenience of the connection of the grounding wire is improved, the grounding effect is improved, the motor can better prevent external electronic interference, and the noise of the motor can be reduced under the condition of reducing the interference.

The present invention discloses a noise reduction control method and system for a permanent magnet synchronous motor based on wide-spectrum high-frequency injection, which belongs to the field of motor control technology. The existing sensorless control scheme based on high-frequency injection in the zero-low speed domain has the problem of large noise. The present invention is based on a noise reduction control method for a permanent magnet synchronous motor based on wide-spectrum high-frequency injection. By constructing a signal acquisition model, an amplitude dynamic processing model, a signal frequency domain processing model, and a rotor position calculation model, the audio signal is adaptively compressed and processed, and the amplitude of the audio signal is reduced while retaining the main audio characteristics, thereby obtaining a wide-spectrum high-frequency injection signal that can reduce motor noise; then, based on the Hilbert transform mechanism, the wide-spectrum high-frequency injection signal is frequency-domain transformed to obtain a mixed signal; and then the mixed signal is processed to obtain rotor position information, thereby effectively solving the noise problem caused by the high-frequency injection current and effectively improving the estimation accuracy of the rotor position.

The invention discloses an electromagnetic noise suppression method, which comprises the following steps: S1, designing an asymmetric magnetic pole winding: the pole-arc coefficient is the ratio of the magnetic pole arc length to the pole distance, the pole-arc coefficient of odd teeth is 1.2, the pole-arc coefficient of even teeth is 1.0, the symmetry of a magnetic field is broken through asymmetric magnetic field distribution, and low-order harmonics in cogging torque pulsation are suppressed; s2, winding optimization of the winding: adopting a distributed winding technology, adopting a precise winding process with the error of the number of conductors in each groove being less than or equal to + / -2%, and reducing the content of higher harmonics by adjusting the pitch and the distribution mode of the winding (adopting a short-pitch winding or a fractional-slot winding); and S3, designing a nanocrystalline alloy shielding layer: additionally arranging the nanocrystalline alloy shielding layer with the thickness of 0.3 mm between the back side of the stator yoke part and the rotor magnetic steel. According to the invention, the design is reasonable, through the multi-physical field collaborative design of the asymmetric magnetic poles and the nanocrystalline shielding layer, the motor noise is systematically suppressed from both an electromagnetic force harmonic source and a high-frequency magnetic leakage path, and both efficiency and reliability are considered.

The utility model discloses a seat motor noise detection device, which belongs to the technical field of seat motor detection and comprises a mounting bottom plate, and a test assembly used for fixing a seat motor and detecting noise of the seat motor in a load state is mounted on the mounting bottom plate. The mounting bottom plate is provided with a counterweight switching assembly which is used for providing different loads for the test assembly and simulating different loads, and the test assembly is connected with the seat motor. Through the above mode, the seat motor detection device can simulate the actual use condition of the seat motor, fix and detect the seat motor needing to be detected, gradually increase the load during detection, detect the operation noise of the seat motor under different loads, and ensure that the seat motor can work normally under the rated load. Meanwhile, the performance of the seat motor under different loads can be analyzed, whether the seat motor operates in a design range or not is judged, the noise influence and the working efficiency of the seat motor are evaluated according to detection results under different loads, and whether improvement or maintenance is needed or not is judged.

The present invention relates to a vehicle-internal audio device (100; 100'; 100''), comprising: - at least one microphone, in particular analog or digital (10), for recording -- engine noise (220) caused by at least one engine (210) associated with the vehicle (200), in particular the drive engine, as well as -- from non-engine noise caused by at least one source other than the engine (210), in particular independent of the engine (210), especially driver and / or passenger voices, tire noise, wind noise and other ambient noise; - at least one ANC unit (40) designed for adaptive noise suppression, by means of which the engine noises (220) detected by the microphone (10) can be processed, in particular suppressed; at least one autoencoder unit (30) upstream of the ANC unit (40), by means of which the motor noises (220) can be distinguished and / or separated from the non-motor noises.

The invention relates to an axial magnetic field motor noise suppression method and system. The method comprises the following steps: collecting current waveform, vibration spectrum and magnetic field distribution data in a motor operation state to construct a multi-dimensional operation state data set; performing synchronous coupling analysis on multi-dimensional operation state data in the operation state data set, and identifying harmonic component characteristics of a current waveform, resonant frequency characteristics of a vibration spectrum and spatial non-uniformity characteristics of magnetic field distribution to obtain a target characteristic set; constructing a dynamic suppression strategy set containing current waveform optimization, vibration frequency matching and magnetic field compensation strategies based on the target feature set; and generating a target phase compensation waveform parameter and a magnetic field adjustment instruction set according to the dynamic suppression strategy set, controlling an output current waveform according to the phase compensation waveform parameter, and correcting spatial magnetic field distribution according to the magnetic field adjustment instruction set so as to effectively suppress the operation noise of the axial magnetic field motor.

The utility model provides a spindle motor noise reduction device, and belongs to the technical field of motors. The spindle motor noise reduction device comprises the noise reduction assembly and the noise reduction assembly, the second noise reduction housing is arranged on one side of the mounting base, the first noise reduction housing is in contact with the second noise reduction housing, noise generated in the operation process of the motor body can be reduced through the first noise reduction housing and the second noise reduction housing, and the noise reduction efficiency is improved. The problem that normal work of operators is affected by noise is solved, the noise reduction effect can be achieved, the damping and buffering effects are achieved through the installation base and the anti-vibration pad, and the problems that in the running process of the motor body, vibration is generated through high-speed rotation, internal load machinery is damaged for a long time, and precision is reduced are solved; and the first noise reduction housing and the second noise reduction housing adopt a detachable structure, so that the motor body can be conveniently overhauled and checked, the noise reduction effect can be further achieved, meanwhile, damage caused by motor vibration can be reduced, and the practicability is improved.

The utility model particularly relates to a motor noise reduction test bench for a new energy automobile, which comprises a base, a bearing seat is arranged on the base, a coupler is arranged in the bearing seat, one outward side of the bearing seat is a through-wall cantilever cylinder mounting surface, a through-wall cantilever cylinder is arranged on the through-wall cantilever cylinder mounting surface, and the through-wall cantilever cylinder is arranged on the bearing seat. The outward side of the through-wall cantilever cylinder is a tested motor mounting surface, a tested motor is mounted on the tested motor mounting surface, and a motor shaft of the tested motor is connected with one end of a coupler; two walls are mounted on the mounting surface of the through-wall cantilever cylinder and the mounting surface of the tested motor, and the through-wall cantilever cylinder penetrates through the two walls and extends into the anechoic chamber; according to the motor noise reduction test bench for the new energy automobile, the tested motor is isolated by two walls and is installed in the closed noise reduction chamber for testing, so that various data obtained in the testing process are more accurate and reliable, and the testing accuracy is improved.

The utility model discloses a low-noise motor, which relates to the technical field of motor noise reduction, and comprises an inner rotor motor, the inner rotor motor comprises a stator shell, a stator coil and a rotor, the stator coil is wound on a winding plate on the inner side of the stator shell, and the rotor is rotatably connected to the middle part of the stator shell; the sound absorption assembly comprises a connecting strip, a clamping groove, a clamping block, an arc-shaped box, micropores, glass fiber cotton and sealing plates, the arc-shaped box is inserted between every two winding plates in the stator shell, the micropores are formed in arc plates on the two sides of the arc-shaped box, the glass fiber cotton is filled in the arc-shaped box, and the sealing plates are fixed to the two ends of the arc-shaped box. According to the utility model, the sound absorption assembly is added inside the stator housing, and noise generated inside the stator housing is absorbed through the micropores arranged on the arc-shaped plate and the glass fiber cotton, so that the problem that the size is enlarged due to the addition of a damping structure outside the motor is reduced.

The invention relates to the technical field of motor abnormal state early warning, and discloses a motor abnormal state early warning system and method, and the system comprises a motor data collection module, a motor data analysis module, and a motor abnormal state early warning module. The motor data acquisition module comprises a motor temperature acquisition unit, a motor noise data acquisition unit, a motor current data acquisition unit and a motor insulation data acquisition unit, and the motor data analysis module comprises a motor temperature analysis unit and a motor insulation data analysis unit. According to the system, the motor temperature, the motor noise data, the motor load data, the motor current data and the motor insulation data in the working process of the motor are collected, and the motor temperature, the motor noise data, the motor current data and the motor insulation data are analyzed; therefore, the specific conditions of abnormal motor temperature, abnormal noise, abnormal insulation layer aging or abnormal current can be obtained, the preliminary judgment of the abnormity of the motor can be realized, and the time loss of maintenance personnel during maintenance can be saved.

The utility model relates to electric motor car technical field discloses a kind of electric motor car motor of middle placement, including protective shell, the inner bottom wall of protective shell is fixedly connected with backing plate, the utility model passes through polyurethane elastomer backing plate, absorbs the vibration energy generated when motor runs, play buffering effect, to reduce the amplitude of vibration transmission to external structure, effectively reduce the noise caused by vibration, simultaneously, sound insulation and noise reduction board of protective shell both sides, its internal fiber structure can produce multiple reflection and absorption to sound, further reduce noise propagation, the aperture of conical sound insulation hole on the surface of sound insulation and noise reduction board gradually decreases, so that sound is hindered and reflected by different aperture size when passing, effectively reduce the propagation intensity of sound, reach better sound insulation and noise reduction effect, significantly reduce the noise when electric motor car motor runs, avoid the adverse effects of traditional motor noise on riding comfort and surrounding living environment.

The application discloses a kind of based on adaptive filtering's household appliance motor noise reduction control method, it is related to household appliance motor control technical field, including: acquisition motor operation multi-source signal, form working condition vector;Spectrum analysis is carried out to sound pressure information and vibration acceleration information, identifies noise frequency band and locates main peak, generates target noise frequency band set;Based on motor operation signal generates reference signal and error signal;Reference signal is input adaptive filter, target noise is estimated and suppressed on line;Based on residual noise distribution generates noise reduction compensation control quantity, feedback to motor drive end;Store operating data and update filter parameter.The application working condition vector comprehensively reflects the real-time running state of motor, when identifying noise frequency band, can accurately distinguish the source type of electromagnetic noise, mechanical noise and aerodynamic noise by combining speed information and commutation frequency, avoids the noise source confusion when judging only according to single signal.

Methods and apparatus for motor startup with reduced acoustic noise include a startup module to generate a startup d-axis voltage during a startup interval and a startup q-axis voltage during the startup interval, wherein the startup interval ends at a time based on the observer error, and wherein the startup q-axis voltage increases during the startup interval. The startup module is configured to continuously linearly increase the speed of the motor during the startup interval. An observer generates a speed estimate, an angle estimate, and an observer error representative of a difference between an actual angle and the angle estimate. A voltage increment by which the startup q-axis voltage is increased during the startup interval is adjusted based on the observer error. The voltage increment can be equal to a constant value plus the observer error.

The invention belongs to the technical field of motor noise reduction control, and particularly relates to a method and system for suppressing vibration noise of a position sensorless control motor. Comprising the following steps: selecting one of a first frequency pulsating voltage signal and a second frequency pulsating voltage signal as a random frequency pulsating voltage signal by adopting a random determination mode; injecting a random frequency pulsating voltage signal under the control of a position sensor, and obtaining a corresponding current response signal; demodulating the current response signal to obtain rotor position information; wherein the matched frequencies of the first frequency pulsating voltage signal and the second frequency pulsating voltage signal are selected, so that a discrete spectrum in a response current PSD frequency spectrum is expanded into a continuous spectrum, and an electromagnetic force wave newly generated by the random frequency pulsating voltage signal is far away from the intrinsic mode frequency of the motor as far as possible. Discrete spectrums of vibration noise caused by injection of random-frequency high-frequency signals are eliminated, and electromagnetic vibration and noise of the motor are effectively reduced.

The application discloses a single-resistance detection method, a motor control method, a controller and a control system. The method comprises the following steps: acquiring a DC bus current flowing through a single sampling resistor, and determining a conduction current of a lower tube of at least one phase bridge arm when the lower tube is turned on according to the DC bus current; acquiring a conduction tube voltage drop of the lower tube of the at least one phase bridge arm when the lower tube is turned on; determining a conduction resistance of the lower tube of the at least one phase bridge arm when the lower tube is turned on according to the conduction current and the conduction tube voltage drop of the lower tube of the at least one phase bridge arm when the lower tube is turned on; determining three-phase currents outside a current detection blind area according to the DC bus current, determining three-phase currents inside the current detection blind area according to the conduction tube voltage drop and the conduction resistance, and determining three-phase feedback currents of the motor according to the three-phase currents outside the blind area and the three-phase currents inside the blind area. The method can avoid the problems of motor noise increase caused by current detection in the blind area by PWM phase shift, and the problems of high current sampling cost and introduction of additional power consumption caused by using multiple resistors for current sampling.

The utility model relates to a cooling fan module. The cooling fan module comprises a motor, a fan and a shroud supporting the motor and the fan, the fan comprises an impeller and fan blades, the impeller is provided with a hub portion and an outer ring, and the fan blades are fixed to the hub portion and located between the hub portion and the outer ring. According to the utility model, the sound insulation cover of the cooling fan module is accommodated in the hub part and is arranged between the hub part and the motor along the radial direction. According to the cooling fan module provided by the utility model, the noise of the motor can be reduced, so that the acoustic performance is improved.