6results 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.

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 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 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 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.