136 results about "Motor noise" patented technology

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 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.

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 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 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 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 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.

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.

The utility model 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 utility model discloses a height adjusting motor for an electric seat of an automobile. The height adjusting motor for the electric seat of the automobile comprises a flat motor rear cover assembly; a cavity for mounting the gear set is formed in the gear box; the sliding plate comprises two U-shaped guide parts, the two ends of the two U-shaped guide parts are fixedly connected, and the side faces, away from each other, of the two U-shaped guide parts are each fixedly connected with two connecting parts. A plurality of stress surfaces are arranged between the sliding plate and the gear box, so that the gear box can be prevented from being damaged due to overlarge stress on a single surface, the motor can run more stably and smoothly, the noise of the motor can be reduced, the added supporting boss and the head of the screw can jointly bear the received forward and reverse thrust, and the service life of the screw is prolonged. In the repeated forward and reverse rotation process of the motor, the screw can be always kept in a locking state, the reliable operation of the motor is ensured, and the service life of the motor is prolonged.

This invention relates to an intelligent method for identifying abnormal motor noises based on time-frequency features and auditory adaptation, belonging to the field of motor fault detection technology. The method includes: real-time acquisition of motor operating sound signals through a multi-directional acoustic signal acquisition array, followed by signal preprocessing and dynamic framing; generation of a time-frequency spectrum using short-time sliding window time-frequency conversion, establishing an auditory baseline for normal operation sound using auditory perception adaptation dynamic weighting technology, and performing hierarchical weighting processing on the time-frequency spectrum to generate fused time-frequency weighted features; construction of a time-frequency weighted feature-enhanced residual network model, achieving abnormal feature extraction and identification through cross-dimensional fusion mechanisms, fault feature transfer learning mechanisms, and fault feature attention mechanisms; and completion of status identification and alarm response using a dynamic adaptation inference mechanism and a hierarchical linkage alarm system. This invention effectively improves the accuracy and real-time performance of motor abnormal noise identification and is suitable for motor status monitoring in complex industrial environments.

This application relates to a method, apparatus, vehicle, and storage medium for identifying abnormal noises in vehicles. The method includes: acquiring a video of the abnormal noise from a test vehicle; converting the video into audio of the abnormal noise; and confirming the time and speed at which the abnormal noise occurs. A noise waterfall plot is obtained from the audio of the abnormal noise, and the order of the abnormal noise is identified by combining the time and speed of the abnormal noise. The order of the abnormal noise is calculated for the motor and reducer components of the test vehicle; the order of the abnormal noise is compared with the order of the motor and reducer components of the test vehicle; and the faulty component is identified based on the comparison result. Embodiments of this application can determine the source of the abnormal noise by comparing the order of the motor and reducer components of the test vehicle with the order of the abnormal noise, thereby accurately identifying the source of the abnormal noise when diagnosing motor noise problems and improving maintenance efficiency.

The embodiment of the present application relates to the fan noise reduction technical field, and particularly discloses an active noise reduction method for a portable fan, which comprises: obtaining a noise signal; the noise signal is a dynamic comprehensive noise signal comprising air inlet noise, air outlet noise, fan blade noise and / or motor noise generated when the portable fan is running; noise control processing is carried out on the noise signal based on a pre-trained noise reduction model to obtain a noise control instruction; a noise reduction signal is sent based on the noise control instruction to carry out active noise control on the portable fan; wherein, within a preset error allowable range, the phase of the noise reduction signal and the noise signal is opposite, the frequency and amplitude are the same, and the noise signal is used for destructive interference. The present application dynamically analyzes the dynamic comprehensive noise signal generated inside and outside the cavity when the fan is running, and sends a corresponding noise reduction signal according to the dynamic comprehensive noise signal, so as to realize active noise control on the fan, thereby reducing the noise level when the fan is running.

This utility model belongs to the field of motor noise containment technology. Specifically, this utility model relates to a novel motor containment structure. The novel motor containment structure includes a motor, on which a motor containment mechanism is provided. A first connecting shell is directly connected to the upper shell of the motor to block the outward transmission of noise from the upper side of the motor. The first, second, third, and fourth connecting shells are tightly fitted to the sides of the motor to reduce noise transmission from the sides. A tenth connecting shell is connected to the lower shell of the motor to block the transmission of noise from the lower side of the motor. The fifth, sixth, seventh, and eighth connecting shells are respectively connected to the four sides of the motor to reduce noise transmission from the sides.

This application provides an industrial vacuum soundproof enclosure, relating to the field of soundproof enclosure technology. It includes a bottom pad module and a double-layer vacuum soundproof enclosure module detachably mounted on the bottom pad module. The double-layer vacuum soundproof enclosure module includes inner and outer connecting base plates detachably mounted on the bottom pad module. A transparent outer cover and a transparent inner cover located inside the transparent outer cover are connected to the side of the inner and outer connecting base plates away from the bottom pad module. A vacuum layer is formed between the transparent inner cover and the transparent outer cover. Through the unique structural design of the bottom pad module and the double-layer vacuum soundproof enclosure module, this application integrates a bottom pad module composed of a soft PP support plate and a silicone sound-absorbing plate, and a double-layer transparent vacuum enclosure composed of a transparent outer cover, a transparent inner cover, etc., forming a multi-dimensional sound insulation system. Compared with traditional sound insulation devices, this can reduce pump and motor noise and reduce noise pollution.

This application relates to the field of motor noise evaluation technology, specifically to a method, system, and electronic equipment for evaluating harmonic howling noise. In use, after determining the vibration test characteristic points based on the drive motor, a prototype for calculating the limit value of harmonic howling noise is selected from multiple vehicles where the motor's howling noise is at a critical level. A bench vibration test is performed on the limit value calculation prototype, and the vibration equivalent limit value at the vibration test characteristic point is derived from the obtained vibration data. During motor production, during the off-line inspection of the motor, vibration data at the vibration test characteristic point is collected, the order vibration equivalent is calculated based on the measured data, and the vibration equivalent is compared with the vibration equivalent limit value to avoid producing motors with excessive howling noise. The vibration equivalent limit value derived by this application is accurate and reliable, and does not require a special noise detection environment, simplifying the testing process and improving production efficiency.

The application provides a combined stator core, a motor, a compressor and an air conditioner, wherein the stator core comprises a first core lamination group and a second core lamination group arranged along the axial direction of the stator core, the first core lamination group comprises a plurality of spliced first laminations, the second core lamination group comprises a plurality of spliced second laminations, the first lamination and the second lamination are connected through a hinge joint, the hinge jointed combined stator core has a ring-shaped yoke portion and a tooth portion, along the radial outward direction of the stator core, the ring-shaped yoke portion has a yoke portion area corresponding to the tooth portion, and the hinge joint is arranged in the yoke portion area. The hinge joint of the lamination is arranged in the ring-shaped yoke portion area corresponding to the tooth portion, the structural strength of the hinge jointed combined stator core is improved, the influence on the magnetic circuit of the stator yoke portion is reduced, the coaxiality of the stator core is improved, the air gap magnetic field harmonic is reduced, the motor noise is reduced, and the motor efficiency is improved.

The purpose of this invention is to provide a device that blows air by fanning, without generating motor noise by not using a motor. [Solution] An electromagnet and a permanent magnet are placed in close proximity. When an electric current is applied, the electromagnet generates a magnetic force that repels the permanent magnet, causing it to move away from the permanent magnet. When the electric current is cut off, the electromagnet loses its magnetic force and is drawn towards the permanent magnet by its magnetic force. By repeatedly applying and cutting the electric current, this force is converted into a reciprocating motion, and this reciprocating motion is used to create a fan that blows air.

The invention relates to the technical field of noise detection, in particular to a motor noise detection method and system, and the method comprises the steps: collecting a sound signal of a to-be-detected motor operating under a specified working condition, and synchronously collecting a vibration signal corresponding to the sound signal, the specified working condition at least comprising a no-load condition and a rated load condition; processing the sound signal and the vibration signal, extracting acoustic features and vibration features, and forming a to-be-detected feature vector according to the acoustic features and the vibration features; the to-be-measured feature vector is compared with a pre-established reference model, a comparison result is generated, and the reference model is established based on historical data of the healthy motor of the same model; and judging a noise state and a noise source of the to-be-detected motor based on a comparison result, and generating a noise detection result. According to the invention, through synchronously collecting sound and vibration signals and extracting features, the features are compared with a reference model established based on health data, and objective judgment of a motor noise state and automatic diagnosis of a fault source are realized.

A four-way headrest frame structure driven by compressed gas is disclosed. The headrest frame structure uses compressed gas as the driving force for the headrest's movement in the fore-and-aft direction of the vehicle body. It includes a headrest frame body, with a front compressed gas drive component and a rear compressed gas drive component on its front and rear sides, respectively. These components actuate upon input of compressed gas. A forward push plate and a rear push plate are respectively located on the outer sides. A left push plate slide rod and a right push plate slide rod pass sequentially through the left and right sides of the forward push plate, the headrest frame body, and the rear push plate, respectively, and are fixed at their ends by locking components. The forward push plate is fixedly connected to the left and right push plate slide rods by fasteners. The front and rear compressed gas drive components cooperate to cause the forward and rear push plates to move forward or backward relative to the headrest frame body as a whole. This structure fundamentally eliminates the discomfort caused by motor noise and vibration when adjusting the headrest in the fore-and-aft direction, improving the driving experience and perceived quality.

The utility model relates to a kind of pneumatic four-way headrest, comprising: the headrest rod being installed on seat framework, four-way headrest being installed on headrest rod, the four-way headrest is pneumatic four-way headrest, the pneumatic four-way headrest includes: Z direction lifting mechanism, X direction adjusting mechanism driven by transverse air bag, wherein, the Z direction lifting mechanism is installed on headrest rod and drives headrest casing to move up and down along vertical direction, the X direction adjusting mechanism is installed on Z direction lifting mechanism and drives headrest casing to move along front-back direction;The utility model has the advantages that: by air bag and coil spring as the four-way adjustment power of headrest, the weight of headrest is reduced, and fundamentally eliminates motor noise and motor vibration when electric headrest is adjusted.

The utility model relates to the technical field of motor noise control, in particular to a stator core for inhibiting motor breathing mode vibration and a motor, which comprises a stator core body, an axial through hole matched with a rotor core is arranged in the middle of the stator core body, the stator core body and the rotor core are separated by an air gap, and the air gap is communicated with the axial through hole. The stator core body is provided with a channel for air to be discharged or enter, an opening at one end of the channel is communicated with the air gap, and an opening at the other end of the channel is communicated with the outside of the stator core body. The vibration noise caused by breathing mode resonance can be greatly reduced.

The utility model provides a motor and an electric tool. The motor comprises a housing, a rotor assembly and a stator assembly which are arranged in the housing, and a bearing frame which is arranged at one end, far away from the housing, of the rotor assembly. A bearing mounting chamber is formed in the shell and / or the bearing frame, and an annular groove is formed in the side wall of the bearing mounting chamber; the elastic piece is fixedly arranged in the annular groove; the bearing is arranged on the output shaft of the rotor assembly in a sleeving mode and located in the bearing installation chamber, and the elastic piece is located between the bearing chamber and the bearing. According to the utility model, when the motor runs, the generated vibration can be buffered by the elastic piece and the rubber pad, the vibration of the bearing can be reduced to be transmitted to the outside of the motor, the noise of the motor is effectively reduced, and meanwhile, the bearing can be adjusted to the optimal position in the bearing chamber because the bearing is not completely fixed when the motor runs, so that the smooth running of the motor is ensured.