27 results about "Motor noise" patented technology

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 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 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 embodiment of the present application relates to the fan technical field, and especially discloses a kind of portable active noise reduction fan, the portable active noise reduction fan includes: shell, shell is a portable shell, with cavity in shell interior, and the air inlet and air outlet that are communicated with each other are respectively arranged at both ends of shell;Fan assembly is set in cavity, for rotating to produce wind pressure, to suck air from air inlet into cavity, and blow out from air outlet;Noise reduction assembly is set in cavity, for real-time acquisition of noise signal inside and outside cavity when fan assembly operates, and according to noise signal to send noise reduction signal;Wherein, noise reduction signal is including air inlet noise, air outlet noise, fan blade noise and / or motor noise dynamic comprehensive noise signal.The present application reduces the noise level when fan operates by the reasonable design of noise reduction assembly function, utilizes noise reduction signal to carry out active noise control to noise signal.

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 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.

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.

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.

[Problem] To suppress an influence of noise from a motor on a sensor. [Means of Solution] A magnetic bearing device includes: a rotating body; a motor including poles whose number is an even number and is not a multiple of 4; a radial electromagnet; a radial displacement sensor; a first oscillator; a second oscillator; and a demodulation circuit, in which the radial displacement sensor includes a first sensor magnetic pole pair and a second sensor magnetic pole pair, each coil of the sensor magnetic pole pair is connected such that polarities of respective magnetic poles are different from each other, one end of the first sensor magnetic pole pair is connected to one end of the second sensor magnetic pole pair such that polarities of a pair of sensor magnetic poles radially facing each other, among the sensor magnetic poles of the first sensor magnetic pole pair and the second sensor magnetic pole pair, are opposite to each other, the other end of the first sensor magnetic pole pair is connected to the first oscillator, and the other end of the second sensor magnetic pole pair is connected to the second oscillator, and a midpoint voltage of the two sensor magnetic pole pairs is input to the demodulation circuit.

The application discloses a mechanical exoskeleton based on man-machine voice interaction and a safety control system, relates to the technical field of mechanical exoskeleton control systems, and comprises a wireless Bluetooth module, an intelligent control hub and a sensor data acquisition module. A user inputs a control intention to a natural language instruction module through natural language voice. The mechanical exoskeleton based on man-machine voice interaction receives voice through the natural language instruction module, transmits the voice to the intelligent control hub for analysis and execution through the wireless Bluetooth module, breaks away from the limitation of physical buttons, realizes blind control, adopts an external design for the wireless Bluetooth module, avoids motor noise interference, improves voice recognition rate, realizes real-time data acquisition through the sensor data acquisition module, realizes voice closed-loop feedback through a TTS feedback synthesis module, the system supports voice broadcast and auditory feedback, provides a mobile terminal interface, and realizes multi-device interconnection.

This invention relates to a miniaturized variable frequency motor for a food processing machine, comprising a motor housing with a cavity; a stator assembly installed within the cavity; and a rotor assembly disposed within the stator assembly, including a rotor core, a plurality of magnets embedded within the rotor core, and a rotor shaft passing through the rotor core. The rotor core has a plurality of pole teeth protruding outwards along its outer circumference, with a tooth groove formed between adjacent pole teeth. Each pole tooth corresponds to one of the magnets. The distance between the tip of a pole tooth and the center of the rotor core is R, where 8 ≤ R ≤ 17 mm, and the distance between the bottom of a tooth groove and the center of the rotor core is r, where r:R is 0.84–0.92. This invention achieves both low motor noise and high motor output torque in a miniaturized variable frequency motor.

This utility model discloses a motor packaging box, including a packaging box and a partition assembly. The packaging box includes a box body, horizontal partitions, and vertical partitions, which are placed inside the box body. The partition assembly includes a bottom plate, a limiting plate, a cover plate, a first limiting hole, a second limiting hole, and an observation hole. The bottom plate, limiting plate, and cover plate are placed layer by layer on top of the horizontal and vertical partitions. The first limiting hole is located on the bottom plate, the second limiting hole is located on the limiting plate, and the observation hole is located on the cover plate. The partition assembly also includes a shock-absorbing pad and a clearance hole. The shock-absorbing pad is placed above the bottom plate and below the limiting plate, and the clearance hole is located on the shock-absorbing pad. This solves the problem of conventional cardboard box packaging, which leads to damage during transportation due to vibration, potential product quality issues, and poor motor noise during production at the customer's location.

The utility model discloses a noise reduction structure of an automobile front cover supporting rod motor, belongs to the technical field of automobile noise reduction parts, and aims to provide a supporting rod motor noise reduction structure which still has good quietness even if an automobile front cover is opened, the noise reduction structure comprises a first shell, a second shell and a hinge shaft, and a first sound insulation cover is arranged on the inner wall of the first shell; a first sound insulation cover is arranged on the inner wall of the first shell, a second sound insulation cover is arranged on the inner wall of the second shell, the first sound insulation cover and the second sound insulation cover jointly wrap the automobile front cover supporting rod motor, one side of the first shell and one side of the second shell are rotationally connected through a hinge shaft, and the other side of the first shell and the other side of the second shell are limited through a connecting piece; the first shell comprises a first cylinder barrel cover and a first motor cover which are integrated, and an inner cavity of the first cylinder barrel cover is communicated with an inner cavity of the first motor cover. According to the invention, the shell structure similar to the stay bar motor in shape is designed, and the sound insulation cover is arranged in the shell structure to wrap the outer side of the stay bar motor, so that the vibration of the stay bar motor is prevented from spreading outwards, and the noise is effectively reduced.

This invention discloses a noise reduction structure for high-speed motors, specifically relating to the field of high-speed motor noise reduction technology. The invention employs four synchronously moving limiting components and a lifting component. Four limiting seats approach the motor base in four directions until the outer edge of the base abuts against the inclined contact portion on the upper part of the limiting plates. This pushes the limiting plates upwards, elastically compressing the springs, allowing the motor base to smoothly enter the area between the four limiting plates. The limiting plates limit the upper edge of the high-speed motor base. The locking plate is released, allowing the limiting seats to slightly adapt to the height adjustment of the motor base. The lifting component drives the lifting plate to rise and fall vertically along the mounting groove, ensuring the motor shaft and the detection ring on the moving frame are at corresponding heights. This locks the position of the limiting seats, improving the coaxial stability of the high-speed motor after installation and enhancing the smoothness and noise reduction effect of the high-speed motor operation.

This utility model relates to a noise testing chamber, including a soundproof enclosure body with an inlet and an outlet on its side wall; a transfer module, which includes a transmission channel composed of multiple electric rollers arranged in a row, the transmission channel passing through the inlet and the outlet, limiting structures on both sides of the transmission channel, and multiple guide rollers on the limiting structures, the multiple guide rollers being arranged above the transmission channel, the rotation axis of the guide rollers being perpendicular to the plane where the multiple electric rollers are located, the multiple guide rollers being distributed along the conveying direction of the transmission channel, and the distance from the multiple guide rollers to the middle of the transmission channel decreasing sequentially; and a testing module disposed inside the soundproof enclosure body. This utility model reduces the workload of operators and improves the efficiency of motor noise detection.

The utility model discloses a motor noise reduction shell, including floating seat, silencer sleeve and noise reduction ring cover. Among them, floating seat is connected with motor bottom surface through flexible support foot, absorbs the vibration of motor, reduces the spread of noise, silencer sleeve has the porous structure, can effectively absorb and scatter the noise of motor, and further reduces noise through the inside silencer fin, noise reduction ring cover includes ring seat and spiral arrangement's whirl vane, is helpful to improve air flow and reduce airflow noise. The motor noise reduction shell still passes through optimization hole design, structure layout and the configuration of silencer fin, has promoted the effect of reducing noise, has avoided the heat dissipation and vibration problem that traditional noise reduction scheme brought to the same extent. This scheme has extensive application prospect, is especially suitable for the motor equipment of requiring low noise and high -efficient heat dissipation.

This suppresses the influence of motor noise on the sensor. [Solution] A magnetic bearing device comprising a rotating body, a motor with an even number of poles that is not a multiple of 4, a radial electromagnet, a radial displacement sensor, a first oscillator, a second oscillator, and a demodulation circuit, wherein the radial displacement sensor has a first sensor pole pair and a second sensor pole pair, and each coil of the sensor pole pair is wired so that the polarity of each pole is different, one end of the first sensor pole pair is connected to one end of the second sensor pole pair such that pairs of sensor poles that are radially opposite to each other are opposite poles, the other end of the first sensor pole pair is connected to the first oscillator, the other end of the second sensor pole pair is connected to the second oscillator, and the midpoint voltage of the two sensor pole pairs is input to the demodulation circuit.

The utility model discloses a low noise block formula motor stator structure, it includes a plurality of stator core blocks, a plurality of stator core blocks form annular core to assemble, the stator core block includes winding post and sets up the arc yoke of winding post upper end and sets up the arc pole shoe of winding post lower extreme, the both ends of arc yoke are equipped with the assembling structure, the end of arc pole shoe is equipped with the edge closing of extending along its circular arc direction and can close the line slot mouth formed between two adjacent arc pole shoes, the utility model discloses the structure design is reasonable, is equipped with the edge closing in the end of arc pole shoe of stator core block, after assembling into the positioning iron core, the edge closing can close the line slot mouth between adjacent arc pole shoes, effectively eliminates the slotting defect of traditional split stator, makes arc pole shoe end part form closed magnetic circuit, reduces air gap permeance abrupt change, effectively reduces motor noise and vibration, and whole structure is simple, is easy to assemble and winding, effectively promotes winding efficiency and slot fullness.

This application discloses an active noise control method, apparatus, equipment, and medium for grid-connected motors, applied to multi-channel active control systems, and relating to the field of noise control technology. The method includes: acquiring noise data signals and determining the target current filter weight coefficients of a preset active control algorithm based on the configuration information of a preset error sensor and the current iteration step size to obtain the current active control algorithm; determining the target secondary sound source signal and performing theoretical noise reduction derivation and experimental noise reduction experiments based on the target secondary sound source signal to obtain theoretical and experimental noise reduction values; determining whether the noise reduction effect corresponding to the current active control algorithm meets the preset noise reduction requirements for the grid-connected motor; if it does not meet the preset noise reduction requirements, updating the current iteration step size and jumping to the step of determining the current active control algorithm until the preset noise reduction requirements for the grid-connected motor are met. This improves the noise reduction effect of drilling grid-connected machines.

The application discloses a carp attracting method based on an analog wake path bionic robot fish, and provides a complete scheme for precisely attracting carps. The robot fish is 40 cm in full length, is divided into four parts such as a fish head and a fish body, is internally provided with three rudders as movable joints, is externally covered with soft rubber waterproof fish skin, has motor noise controlled in 60-80 dB, and supports remote control through Bluetooth. The working process of the robot fish is as follows: first, light and water flow speed information is collected; then, four behavior parameters such as carp swimming speed and speed synchronism are obtained through a quantitative formula; subsequently, the swimming speed, tail swing frequency and trajectory are adjusted according to the environment and parameters; the light environment adopts a circular trajectory, and the dark environment adopts a close-range circling trajectory; finally, the wake path of the carp is simulated to induce the carps to form leading and following behaviors. The scheme realizes dynamic adaptation of fish attracting strategies, greatly improves the success rate of fishway fish attracting, and is suitable for carp migration guiding and breeding management.

The present application relates to the technical field of noise detection, and particularly relates to a motor noise detection method and system, the method comprising: collecting a sound signal of a motor to be detected under a specified working condition, and synchronously collecting a vibration signal corresponding to the sound signal, the specified working condition at least including no-load and rated load; processing the sound signal and the vibration signal, and extracting acoustic characteristics and vibration characteristics, and forming a to-be-detected characteristic vector according to the acoustic characteristics and the vibration characteristics; comparing the to-be-detected characteristic vector with a pre-established reference model to generate a comparison result, the reference model being established based on historical data of a healthy motor of the same type; judging a noise state and a noise source of the motor to be detected based on the comparison result, and generating a noise detection result. The present application realizes objective judgment of a motor noise state and automatic diagnosis of a fault source by synchronously collecting sound and vibration signals, extracting characteristics, and comparing with a reference model established based on healthy data.

The utility model discloses a square motor shock absorption and noise reduction waterproof structure, its characterized in that, including: upper cover and lower cover, wherein, the lower cover cover in square motor is used for inserting the one end of terminal, the upper cover cover in square motor has the one end of output shaft, the upper cover and lower cover adopt interlaced structure and fit together to full package square motor, the sleeve top of upper cover is provided with the axle perforation, when installing, the output shaft of square motor penetrates whole square motor and passes axle perforation, a plurality of shock absorption recesses are provided on the outer peripheral surface of upper cover and lower cover. The utility model discloses adopt upper cover and lower cover full package square motor structure, under the holding of elasticity, friction, make its waterproof capacity more outstanding. Simultaneously play the role of reducing noise. In addition, because upper cover and lower cover adopt the elastic material and make, play the role of reducing noise, reduce square motor noise level, can make the original square motor more competitive.

The application relates to the field of motor noise reduction technology, and discloses a motor noise reduction device for a handheld fan, the handheld fan comprising a fan blowing part and a handheld part, and a driving motor being arranged in the fan blowing part; the motor noise reduction device comprises: a noise collector arranged in the fan blowing part and used for collecting motor noise generated by the handheld fan during operation in real time; the motor noise comprises mechanical vibration noise, electromagnetic noise and aerodynamic noise of the driving motor; a noise processor arranged in the handheld part and electrically connected with the noise collector, used for generating a noise control instruction based on the motor noise when the signal strength of the motor noise is greater than a strength threshold; and a noise suppressor arranged in the fan blowing part and electrically connected with the noise processor, used for acquiring the noise control instruction and emitting a noise reduction signal according to the noise control instruction to perform destructive interference on the motor noise. The application reduces the motor operation noise level through active noise reduction and accurate processing of the fan motor noise.