13results about How to "Reduce howling" patented technology

The invention discloses a moving iron unit, a hearing aid and an assembling method of the moving iron unit. The moving iron unit comprises a magnet yoke, a first magnet, a second magnet, a driving assembly, an induction coil, a vibration unit and a support. A cavity is defined by the magnet yoke, the first magnet and the second magnet are arranged in the cavity, and a gap is formed between the first magnet and the second magnet; the induction coil has a central hole; the driving assembly comprises a balance armature and a driving rod, the balance armature penetrates through the center hole and the interval in a suspended mode, and the driving rod is connected with the balance armature and the vibration unit. The driving assembly drives the vibration unit to vibrate under the condition that the induction coil is electrified; the magnet yoke and the induction coil are limited on the bracket, so that the connection condition of the driving rod and the vibration unit / balance armature can be conveniently checked in the assembling process of the moving iron unit; and meanwhile, the magnet yoke and the induction coil are respectively isolated from the shell of the moving iron unit by the bracket, so that noise and squeal can be reduced from the source.

The invention relates to a rotor, a motor rotor surface grooving method, a motor and a vehicle, the rotor comprises a rotor body, the surface of the rotor body is provided with a surface groove body, the surface groove body is of a symmetrical structure extending in the axial direction of the rotor body, and the width of the surface groove body is smaller than or equal to the distance between two adjacent guide bars in the rotor body. The slotting method comprises the following steps: acquiring a structural mode and an inherent frequency of a stator; obtaining the space wave number and the mechanical frequency of harmonic electromagnetic force generated by the stator harmonic and the rotor harmonic; determining to-be-optimized harmonic electromagnetic force based on the spatial wave number and the mechanical frequency; obtaining the resonance speed and torque of the motor based on the structural mode and the inherent frequency; determining the minimum amplitude of the harmonic electromagnetic force based on the resonance rotating speed and the torque; and obtaining small-amplitude rotor surface slotting characteristics. According to the invention, the technical problems of easy failure of motor noise reduction and reduction of motor power and service life caused by the noise reduction process in the prior art can be improved.

The invention provides an order noise control method and device of a motor, electronic equipment, a storage medium and a vehicle, and the order noise control method of the motor comprises the steps: determining a current working condition of the motor; querying a harmonic table based on the current working condition to determine an optimal harmonic of the current working condition based on the harmonic table; and adjusting a harmonic parameter based on the optimal harmonic of the current working condition, and injecting the optimal harmonic of the current working condition into a high-voltage ripple current based on the harmonic parameter so as to suppress the high-voltage ripple current based on the optimal harmonic of the current working condition. According to the invention, motor squeal can be improved.

The utility model discloses an air conditioner indoor unit air duct structure, which is characterized in that a plurality of flow guide ribs which are arranged at intervals along the length direction of a volute tongue body are convexly arranged on the windward side of the volute tongue body in the air conditioner indoor unit air duct structure, and the extension direction of each flow guide rib is vertical to the length direction of the volute tongue body; a diversion trench is formed in an interval space between every two adjacent diversion ribs; and the top heights of the flow guide ribs are sequentially changed, so that the top connecting line track of the flow guide ribs is a periodic volt curve. According to the volute tongue, the distance between the flow guide ribs and the fan is in a changing state by utilizing the height change of the flow guide ribs, so that the impact of airflow on the volute tongue body is dispersed by utilizing the time difference of the airflow received by different flow guide ribs, the periodic excitation of rotating airflow on the volute tongue body is disturbed, and the frequency superposition is weakened; according to the invention, howling sound caused by airflow impact can be effectively weakened, a good noise reduction effect is achieved, and better use experience is brought to a user.

This invention relates to the field of centrifugal fans, specifically disclosing a portable energy-saving electric fan and its usage method. The fan includes a housing with a grille and a fan installed inside the housing. The fan's outlet is aligned with the grille. The top of the housing has an opening through which the fan can extend. The fan's outer casing is divided into a fixed part and at least one movable part. The movable part is movable relative to the fixed part. When the movable and fixed parts are separated, maintenance tools can be inserted into the casing to inspect the inner wall and impeller. This invention allows the fan to be lifted from the housing for easy maintenance. Furthermore, the fan's outer casing can be divided into a fixed part and at least one movable part, and the fixed and movable parts can be fixed to the fixed part without connecting parts, only by a retaining element inside the housing, facilitating maintenance and return to its original position after maintenance.

The utility model discloses a top net support of a condenser microphone and the condenser microphone. The top net support comprises a plurality of hollowed-out side plates, and a cylinder is defined by the side plates. According to the capacitor microphone, the hollow top net bracket is arranged, so that the side incoming sound can be improved, the side sound reflection can be reduced, the frequency response characteristic of the capacitor microphone can be improved, the directional characteristic can be optimized, the comb filtering effect and the side lobe phenomenon can be inhibited, and the capacitor microphone has the advantages of simple structure, easiness in assembly, good acoustic performance and the like.

The utility model relates to the technical field of earphones, and provides an earphone, which comprises an earphone main body and an ear hook, and is characterized in that the earphone main body is internally provided with a first microphone matrix; and the ear hook is connected with the earphone main body, the ear hook is used for being hung on the auricle, a second microphone matrix is arranged in the ear hook, and the second microphone matrix is in communication connection with the first microphone matrix to form microphone array cooperative operation. By optimizing the position layout and cooperative operation of the microphones, the performance of the earphone can be effectively improved, so that the use experience of a user is improved.

The utility model relates to the field of hearing-aid earphones, in particular to a damping hearing-aid earphone. The damping piece is arranged around the loudspeaker, and a gap is formed between the circuit board and the loudspeaker during installation. When the loudspeaker vibrates during sound production, the vibration amplitude can be reduced by the damping pieces around the loudspeaker, and the situation that the wearing comfort is reduced due to the fact that the earphone vibrates too much is prevented. A gap is arranged between the circuit boards, so that the loudspeaker has a vibration space in the hearing aid, and high-frequency collision of vibration of the loudspeaker on the circuit boards is prevented, so that damage to the circuit boards is prevented. And the first sleeve of the microphone assembly is sealed, so that the sealing performance of the microphone is improved.

The application discloses a howling suppression method, device and storage medium, and relates to the technical field of hearing aids, and comprises the following steps: acquiring each detection signal input to the secondary receiver, identifying a secondary channel according to the detection signals, obtaining a secondary channel estimation vector, and representing a physical acoustic path through which the detection signal is transmitted from the secondary receiver to a microphone; acquiring each reference signal output by the primary receiver, iteratively updating a coefficient vector of a preset filter according to the secondary channel estimation vector and the reference signals; and generating a cancellation signal of the secondary receiver according to each original signal output by the primary receiver during wearing and the updated coefficient vector, wherein the cancellation signal is used to cancel the leakage sound generated in the process of transmitting the original signal from the primary receiver to the microphone. Through the driving of the cancellation signal, the secondary receiver generates a sound field opposite to the primary receiver, so as to cancel the leakage sound from the primary receiver to the microphone, and improve the use experience of the user.

The noise reduction box is provided with a matching part, the matching part is matched with the upper surface of a pot cover to form a containing cabin used for containing a heavy hammer, the matching part is provided with a noise reduction concave cavity which is concave upwards, the matching part is provided with an air passing opening in the periphery of the noise reduction concave cavity, and the noise reduction concave cavity corresponds to an air outlet in the top of the heavy hammer. At least part of airflow in the containing cabin flows through the noise reduction cavity and then flows out of the air passing opening. The air flow sprayed out of the air outlet of the heavy hammer can upwards flow into the noise reduction concave cavity, the noise reduction concave cavity can buffer the air flow and reduce the kinetic energy of the air flow, and can enable the air flow to flow back and forth downwards and then to be dispersed and flow back into the containing cabin, so that the gathered air flow in the noise reduction concave cavity flows in a dispersed mode, and the noise reduction effect is improved. And the airflow with small flow is divided into a plurality of strands of airflow to flow towards an air passing port on the outer side and flows out from the air passing port. Therefore, noise generated in the airflow flowing process is greatly reduced, and the noise reduction effect and the use experience are improved.

The invention provides a high-precision low-noise overflow valve, and belongs to the technical field of overflow valves, the high-precision low-noise overflow valve comprises a valve body, a main valve core, a back pressure valve and a control cavity, the valve body is provided with a water outlet and a water inlet, the top end of the water inlet is provided with a main valve core cavity, and the top end in the main valve core cavity is fixedly provided with a first spring; and one end of the first spring is arranged at the top end of the main valve element, the main valve element is in sliding connection with the main valve element cavity, and the top end of the main valve element cavity is connected with a water cavity through a water hole. The piston pressing sleeve and the screw plug sleeve which are independently arranged are matched with the first elastic piece and the second elastic piece to work, so that when the piston pressing sleeve is reset, the pressure of the water inlet is stable, pressure impact is not generated, howling and vibration are reduced, and noise is reduced during working.

The application belongs to the technical field of motor controller cooling, and particularly relates to a long-duct cooling and noise reduction motor controller based on a Laval tube, which comprises a shell and a cooling device, wherein the internal space of the shell is divided into a first cavity and a second cavity by a large-capacity group, and the first cavity and the second cavity are arranged in sequence along the length direction of the shell; the cooling device comprises a first air cooling assembly arranged in the first cavity; the long-duct cooling and noise reduction motor controller based on the Laval tube is used to realize flow speed multiplication by arranging the Laval tube-shaped cooling cavity, to form airflow management of first acceleration and then deceleration by symmetrically arranging the first air cooling assembly and the second air cooling assembly, and to solve the problems of small wind speed, insufficient end heat dissipation and airflow noise caused by the Laval tube acceleration by combining a double noise reduction mechanism of pressure reduction and speed reduction of the outlet section of the second heat dissipation block and the micropore array of the air outlet hole and key structural parameter design basis.

The invention belongs to the technical field of motors, and particularly relates to a high-speed fan motor and a high-speed blower, the high-speed fan motor comprises a multi-channel machine shell which is arranged to be of a three-layer cylindrical structure which is coaxially arranged inside and outside and is nested in a staggered mode, and an annular columnar main air channel is formed between an inner shell and an outer shell; the inner shell is provided with a first radial rib for connecting the inner shell with the outer shell; and a cylindrical secondary air duct is formed between the inner shell and the bearing mounting sleeve, and a second radial rib for connecting the inner shell and the bearing mounting sleeve is arranged between the inner shell and the bearing mounting sleeve. The device comprises an airflow acceleration structure, the airflow acceleration structure produces a remarkable low-pressure area in a corresponding area of an iron core of a main air channel, air in a secondary air channel is strongly sucked to flow through a coil gap and a magnetic gap at a high speed, and active and efficient cooling of a heating core is achieved. The temperature of the iron core and the coil is reduced, the efficiency of the motor is higher, supplied current can be reduced, radiation and heat transmitted to the bearing are reduced, the bearing is cooled, and the service life of the bearing is prolonged.