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41results about How to "Reduce electromagnetic noise" patented technology

A multi-parameter and multi-objective optimization design method for single-phase induction motor

A multi-parameter and multi-objective optimization design method for a single-phase induction motor relates to a motor optimization design method, comprising step 1: obtaining electromagnetic noise data of the single-phase induction motor prototype through an electromagnetic noise test experiment of the single-phase induction motor prototype, analyzing the electromagnetic noise amplitude-frequency characteristics of the single-phase induction motor prototype using the test data, and finding the frequency component whose amplitude is greater than a set threshold; step 2: optimizing geometric structure parameters using an electromagnetic finite element model of the single-phase induction motor; step 3: optimizing circuit parameters using an electromagnetic analytical model of the single-phase induction motor. The present invention can quickly improve motor output performance and NVH performance by changing motor geometric structure parameters and circuit parameters on the basis of the prototype, thereby improving the market competitiveness of the product.
Owner:HARBIN INST OF TECH AT WEIHAI +1

A noise reduction stator, motor and compressor

The utility model relates to the technical field of stator, concretely relates to a kind of noise reduction stator, motor and compressor;Wherein, noise reduction stator, including annular yoke and the alternate arrangement of continuation part and abutting portion on the outer periphery of annular yoke, abutting portion abuts to the inner side wall of shell;Continuation part is formed along the radial recess in the direction of departing from shell, and the corresponding central angle of continuation part is SA1;With the lowest point of continuation part recessing, the annular P formed by surrounding is reference, the distance of abutting portion to annular P is T1;Continuation part includes the first arc segment and second arc segment of connection, and the radius of first arc segment is RR1;The radius of second arc segment is RR2;The utility model limits the relationship between the corresponding central angle of continuation part in noise reduction nail, the distance of abutting portion to the lowest point of continuation part and the specific size between continuation part structure, to make noise reduction stator produce good effect in reducing electromagnetic noise.
Owner:TCL RUIZHI (HUIZHOU) REFRIGERATION EQUIP CO LTD

Control method and device of electromagnetic heating equipment, equipment and storage medium

The invention discloses a control method, device and equipment of electromagnetic heating equipment and a storage medium. The method comprises the following steps: in response to a heating starting instruction, controlling electromagnetic heating equipment to start heating; in the heating process of the electromagnetic heating equipment, the switch-on duration of the switch module in one pulse signal period is controlled, so that the electromagnetic heating equipment meets the low-noise working condition. According to the technical scheme provided by the embodiment of the invention, in the heating process of the electromagnetic heating equipment, the switch-on duration of the switch module in one pulse period is controlled, so that the resonant frequency of the electromagnetic heating circuit is controlled, the resonant frequency of the electromagnetic heating circuit and the inherent frequency of a cooker are kept a large difference, and the electromagnetic heating efficiency is improved. The electromagnetic heating circuit and the cookware are prevented from resonating, or the resonance time of the electromagnetic heating circuit and the cookware is prevented from being too long, so that the electromagnetic noise of the electromagnetic heating equipment in the heating process is reduced.
Owner:FOSHAN SHUNDE MIDEA ELECTRICAL HEATING APPLIANCES MFG CO LTD

Method and device for controlling motor controller, vehicle, medium and program product

PendingCN122697937Aeffective dispersionMeet preset performance conditions
The application relates to the technical field of motor control, in particular to a control method and device of a motor controller, a vehicle, a medium and a program product, wherein the method comprises the following steps: in response to an adaptive modulation instruction of the vehicle, the motor controller is controlled to switch to an adaptive modulation working mode; an operating state parameter of the motor controller is collected, and a frequency offset of the motor controller is determined according to the operating state parameter; a carrier frequency offset value is calculated according to the frequency offset and a preset reference carrier frequency, and the motor controller is controlled based on the carrier frequency offset value, so that the motor control meets a preset performance condition. Therefore, the problems that in the related art, the SVPWM fixed frequency causes harmonic concentration, electromagnetic noise, resonance and common-mode interference, influences NVH and reliability, the RSVPWM random number quality is poor, harmonic diffusion is insufficient, excessive randomness reduces precision and dynamic response, the fixed strategy has poor adaptability, and calibration is complicated and engineering implementation is difficult are solved.
Owner:BEIJING AUTOMOBILE RES GENERAL INST

Thermal compensation device and method for electric spindle of machine tool and numerical control machine tool

The invention provides a thermal compensation device and method for an electric spindle of a machine tool and a numerical control machine tool, the thermal compensation device comprises a displacement detection device and a control device, a detection part of the displacement detection device is arranged on a tool handle connected with the spindle, and the detection part of the displacement detection device and a detection surface of the tool handle are arranged at an interval in the vertical direction; the detection part of the displacement detection device is opposite to and parallel to the detection surface of the cutter handle; the displacement detection device is used for detecting the thermal displacement of the main shaft in the vertical direction by detecting the distance change between the detection part of the displacement detection device and the detection surface of the cutter handle; and the control device is connected with the displacement detection device, and the control device is used for acquiring data detected by the displacement detection device and adaptively adjusting the position of the main shaft in the vertical direction according to the data detected by the displacement detection device. The thermal compensation device of the machine tool motorized spindle can effectively solve the technical problems that in the prior art, a thermal compensation device of a machine tool motorized spindle is complex in structure and poor in anti-interference capacity.
Owner:GREE ELECTRIC APPLIANCE INC OF ZHUHAI

Method and device for processing motor iron core punching sheet, electronic equipment and storage medium

PendingCN119652023AReduce electromagnetic noiseManufacturing dynamo-electric machinesPunchingElectric machinery
The invention relates to the technical field of motors, and discloses a method for processing a motor iron core punching sheet, and the motor iron core punching sheet comprises a rotor punching sheet. The method comprises the following steps: acquiring the number of poles of a motor and an excircle trimming type, and determining an excircle trimming endpoint of a rotor punching sheet according to the number of poles of the motor and the excircle trimming type; and connecting the outer circle cut edge end points according to the outer circle cut edge type to obtain a first target cut edge. And processing the rotor punching sheet according to the first target trimming. Therefore, the rotor punching sheet is processed according to the first target cut edge, and the cogging torque and the torque ripple of the motor can be effectively reduced under the condition that the motor adopts the processed motor iron core punching sheet, so that the electromagnetic noise of the motor is reduced, and the problem that the noise is too large when the compressor runs is solved. The invention further discloses a device for machining the motor iron core punching sheet, electronic equipment and a storage medium.
Owner:QINGDAO HAIER AIR CONDITIONER GENERAL CORP LTD +3

Motor stator insulation system

The invention provides a motor stator insulation system, which comprises a stator core, a first insulation framework, a second insulation framework and slot insulation paper, and is characterized in that the first insulation framework and the second insulation framework are respectively assembled at two ends of the stator core. A first cover plate and a second cover plate are arranged at the groove bottom and the groove shoulder of the groove part of the insulation framework, the first cover plate and the second cover plate form a semi-closed insulation layer structure, the groove insulation paper is unfolded into special-shaped insulation paper, the main body is clamped into the groove part of the stator iron core and is tightly attached to the first cover plate and the second cover plate, and the protruding structure extends out of the groove part of the insulation framework from the two side edges. The gap between the first cover plate and the second cover plate is filled, and the protruding structure is matched with the first cover plate and the second cover plate in a limiting and pressing mode. The insulation framework and the groove insulation paper are mutually limited, mutually compensated, wriggled relative to materials and matched with an open-loop gap, so that the insulation strength is improved, the tension on an enameled wire during winding is relieved, the safety strength of an insulation system is improved, and meanwhile, the utilization rate of an effective groove of the motor is improved.
Owner:常州拓昂电机有限公司

A low noise cooling fan

The invention relates to the technical field of heat dissipation devices, and discloses a low-noise heat dissipation fan, comprising a base and double-layer blades, wherein a bearing is arranged at the center of the base, and a stator is arranged in a circumferential array on the side surface of the bearing, the stator is an iron core, and is wrapped by a painted coil to form an electromagnet, the energization state of the coil is controlled by a control circuit, and a Hall sensor is arranged for detection, the double-layer blades are composed of a rotor, a connecting ring and blades, the rotor is located at the axis center of the double-layer blades, and is cylindrical, a crankshaft connected to the stator is arranged at the axis center of the bottom of the double-layer blades, blades are arranged in a circumferential array on the side surface of the rotor and are connected to the connecting ring, and blades are also arranged in a circumferential array on the outer side surface of the connecting ring to form a double-layer blade structure, the inner wall surfaces of the rotor and the connecting ring are evenly arrayed with permanent magnets, and the permanent magnets located in the connecting ring and the permanent magnets in the rotor are arranged at different angles.
Owner:HANGZHOU SAIWEI MOTOR

Stator assembly, driving device, fan water pump assembly and water heater

The utility model discloses a stator assembly, a driving device, a fan water pump assembly and a water heater, and relates to the technical field of driving. Wherein the stator assembly comprises a stator iron core, a first winding and a second winding, the stator iron core comprises an annular yoke part, a plurality of inner teeth arranged on the inner circumference of the annular yoke part and a plurality of outer teeth arranged on the outer circumference of the annular yoke part, a first stator groove is formed between every two adjacent outer teeth, and a second stator groove is formed between every two adjacent inner teeth; the notch width of the first stator slot is equal to that of the second stator slot; the first winding is correspondingly wound on the outer teeth; the second winding is correspondingly wound on the inner teeth, and the second winding and the first winding are configured to be controlled independently. According to the technical scheme, one driving device has two kinds of power output, the size of the driving device is reduced, and the installation space of the driving device in electrical equipment is reduced.
Owner:GUANDONG MIDEA KITCHEN AND BATH APPLIANCES MFG CO LTD +1

Rotor core and motor having the same

ActiveCN116131491BImprove air gap magnetic fieldOptimize circulation pathMagnetic circuit rotating partsMagnetic circuit stationary partsElectric machineMagnetic poles
The application provides a rotor core and a motor with the same. The rotor core is formed with a plurality of magnetic poles which are arranged at intervals along the circumference of the rotor core. The outer periphery of the cross section of each magnetic pole comprises a plurality of arc lines and a plurality of straight lines, and the plurality of arc lines and the plurality of straight lines are arranged alternately. The air gap magnetic field between the stator core and the rotor core is optimized, the torque ripple is reduced, the motor demagnetization resistance and the motor efficiency are improved. The stator tooth is opposite to the magnetic pole and comprises a tooth body and a tooth shoe. The tooth shoe comprises two tooth shoes which are arranged at the two radial sides of the tooth body respectively. The tooth body corresponds to the first arc line, and the tooth shoe corresponds to the straight line. The magnetic field in the region between the tooth body and the first arc line is the strongest, the magnetic field in the region between the stator slot and the second arc line is the weakest, and the magnetic field in the region between the tooth shoe and the straight line is in the middle. The position and size of the straight line can be adjusted to adjust the magnetic field in the region. The motor iron loss is greatly reduced, the magnetic steel utilization rate is improved, and the motor harmonic loss is reduced.
Owner:ZHUHAI LANDA COMPRESSOR +1

Standard interface seat

The invention relates to the technical field of electronic design, and provides a standard interface seat which comprises a carrier plate, an interface seat, an installation part, a case panel and a bottom cover, one end of the installation part is connected with the case panel, the other end of the installation part is connected with the bottom cover to form a shielding cavity, the interface seat is installed in the shielding cavity, and the interface seat is installed on the carrier plate. One end of the carrier plate is inserted into the mounting piece, a first part of the carrier plate outside the shielding cavity is provided with a filter device and a wire holder, and a second part of the carrier plate in the shielding cavity is in conductive lap joint with the mounting piece and the bottom cover respectively. According to the scheme, the interface seat is mounted in the mounting piece and fixed in the structural piece, so that the mounting piece is connected with the case panel, and the filter device and the wire holder of the first part of the carrier plate are used for filtering noise, so that network signal electromagnetic noise and radiation interference which are transmitted into the second part of the carrier plate are reduced; therefore, the electromagnetic shielding requirement is met by forming conductive lap joint with the mounting piece and the bottom cover.
Owner:西安超越申泰信息科技有限公司

Magnetic circuit structure for improving NVH (noise vibration and harshness) of motor

The utility model relates to the technical field of motors, in particular to a magnetic circuit structure for improving NVH (noise vibration and harshness) of a motor, a stator core of the magnetic circuit structure is formed by splicing and assembling a plurality of groups of stator teeth and is annular, and the stator core achieves a notch-free effect while ensuring winding, so that magnetic resistance is kept unchanged when a rotor core rotates, electromagnetic noise is reduced, and the service life of the motor is prolonged. The NVH of the motor is reduced; comprising a rotor iron core and a stator iron core, the stator iron core is annular, the stator iron core is formed by splicing a plurality of groups of stator teeth, and the rotor iron core is arranged on the inner side of the stator iron core.
Owner:NINGBO TUOPU GROUP CO LTD

Wave-losing electromagnetic oven with low electromagnetic noise

PendingCN122002657AReduce electromagnetic noiseReduce the sound of pot knockingDc-dc conversionInduction heating controlNoise generationHemt circuits
The invention provides a low-electromagnetic-noise wave-losing induction cooker, which comprises an LC resonance circuit, an IGBT module, an MCU unit, a gate drive IC and a pot detection circuit, and is characterized in that the MCU unit is connected with the IGBT module through the gate drive IC; the driving voltage range of the IGBT module is 9-18V, and the gate driving IC has a plurality of power supply modes within the driving voltage range of 5-18V; a power judgment module is arranged in the MCU, and when the power judgment module detects that the working power of the induction cooker is lower than 50% of the maximum power, the MCU controls the gate drive IC to be switched to a 9V power supply mode; when the power judgment module detects that the working power of the induction cooker is greater than or equal to 50% of the maximum power, the MCU unit controls the gate drive IC to be switched to a 18V power supply mode; when the pot detection circuit works, the MCU unit controls the gate drive IC to be switched to a 9V power supply mode. According to the low-electromagnetic-noise wave-losing-mode induction cooker provided by the invention, through wide-voltage IGBT model selection and the design of the special driving control module, flexible switching of driving voltage is realized, noise generation is inhibited from the source, and the use experience is improved.
Owner:GUANGDONG SWEET JIANZHOU ELECTRIC CO LTD

Wireless beam transmission method based on active controllable absorption / attenuation and related equipment

The invention discloses a wireless wave beam transmission method based on active controllable absorption / attenuation and related equipment, and the method comprises the steps: transmitting an environment detection wave beam to a corresponding direction through a wave beam transmitting and receiving module in a wireless wave beam transmission device, and dynamically detecting electromagnetic working wave beams in different electromagnetic environments and electromagnetic noise in the environments at regular time through a detection node; and the sensitivity of receiving and identifying beams and the environment dynamic adaptability of the equipment are improved. The wave beam detection module is used for detection, then a detection result is fed back to the wave beam transmitting and receiving module for control strategy analysis, the controllable wave absorbing module performs wave absorbing / attenuation on an electromagnetic field in a corresponding direction according to a control strategy, and wave absorbing / attenuation is performed directionally so as to prevent normal / malicious interference of other non-working wave beams. And the anti-attack / anti-interference capability of the equipment is improved. The wave beam transmitting and receiving module, the wave beam detection module and the controllable wave absorbing module all use modularization and a master-slave backup technology, so that the equipment failure rate is reduced.
Owner:SICHUAN JIUZHOU ELECTRIC GROUP CO LTD

Deposition apparatus, deposition method, and deposition system

ActiveCN116265600BReduce electromagnetic noise
A deposition apparatus includes a magnetic shield. The magnetic shield reduces external noise in a chamber including a target and at least one electromagnet for copper physical vapor deposition. The shield may have a thickness ranging from about 0.1 mm to about 10 mm to provide sufficient protection against radio frequency and other electromagnetic signals. Therefore, copper atoms in the chamber experience less redirection from external noise. Furthermore, even if hardware failures occur during physical vapor deposition (e.g., electromagnet malfunction, wafer stage misalignment, and / or excessive offset caused by a flow optimizer), copper atoms are less susceptible to the effects of minor redirections from external noise. Consequently, the conductive structures of the back-end and / or mid-end processes are formed in a more consistent manner, which increases conductivity and improves the lifetime of electronic devices incorporating conductive structures from the back-end and / or mid-end processes.
Owner:TAIWAN SEMICONDUCTOR MANUFACTURING CO LTD

Sectional type rotor structure

The invention discloses a sectional type rotor structure, and belongs to the technical field of servo motors. The structure comprises a plurality of iron core sections formed by laminating the same kind of rotor punching sheets, and the punching sheets are provided with asymmetrical front surfaces and back surfaces. A first type of iron core sections are formed by laminating with the front faces facing upwards, a second type of iron core sections are formed by laminating with the back faces facing upwards, and the two types of iron core sections are alternately arranged in the axial direction and staggered by a certain angle around the axis. Each iron core section is provided with a positioning part, and two adjacent iron core sections achieve accurate angle positioning and assembly by aligning the positioning parts. According to the invention, the segmented rotor with the dislocation effect can be manufactured by using only one set of mold, so that the cost is greatly reduced; the cogging torque and the electromagnetic noise are effectively weakened through the segmented pole staggering effect, and the operation stability is improved; meanwhile, the permanent magnet is firmly installed, the assembling process is simple and convenient, mistake proofing is achieved, and the consistency and reliability of products are guaranteed.
Owner:NINGBO DANDUN HYDRAULIC TRANSMISSION CO LTD

Motor rotor, motor and compressor

The present invention provides a motor rotor, a motor and a compressor. The motor rotor includes a rotor body, a plurality of poles are arranged in the circumferential direction of the rotor body, each of the poles includes two magnetic steel slots arranged at intervals along the radial direction of the rotor body and a permanent magnet embedded in the magnetic steel slot, and at least one magnetic barrier structure is arranged between the two magnetic steel slots of each pole. The present invention can control the reactance on the cross-axis magnetic circuit of the motor rotor within a reasonable range, ensure that the motor rotor has a certain output torque, and at the same time reduce the output torque pulsation and radial electromagnetic force, improve the cogging effect, and reduce the electromagnetic excitation force and the electromagnetic noise caused by it.
Owner:ZHUHAI GREE REFRIGERATION TECH CENT OF ENERGY SAVING & ENVIRONMENTAL PROTECTION

Brushless motor electromagnetic noise suppression method and system based on harmonic current injection

PendingCN122437453AAchieve quantitative identificationAdd control strategy
The present application relates to the technical fields of electromagnetic noise suppression, and relates to a brushless motor electromagnetic noise suppression method and system based on harmonic current injection, comprising: confirming a noise brushless motor and a motor monitoring device, obtaining motor data of the noise brushless motor, using the motor monitoring device to analyze the noise of the noise brushless motor, obtaining a motor noise signal, performing frequency spectrum feature analysis on the motor noise signal, obtaining noise order, electromagnetic noise amplitude and electromagnetic characteristic frequency, performing phase-sensitive detection on the motor noise signal based on the noise order, the electromagnetic characteristic frequency and the electric angle time signal, obtaining the motor relative phase, performing adaptive fine tuning on the preliminary harmonic current data set based on the motor monitoring device and the vector voltage time signal set, obtaining a target harmonic signal set, performing harmonic injection on the noise brushless motor based on the target harmonic signal set, obtaining a noise suppression motor, and completing electromagnetic noise suppression of the brushless motor. The present application can reduce the electromagnetic noise level of the brushless motor.
Owner:深圳禄华科技有限公司

Composite vibration motor for electric toothbrush

ActiveCN222563638UReasonable and effective cleaningreduce feverMechanical energy handlingTooth cleaningPhysicsVibration motor
The utility model belongs to the technical field of electric toothbrushes, and relates to a composite vibration motor for an electric toothbrush, which comprises a first driving part (1) and a second driving part (2), the front end of a first driving shaft (11) of the first driving part (1) is connected with a brush head, and the rear end of the first driving shaft (11) is connected with the front end of the second driving part (2) through a connecting bearing (3). And the rotation of the first driving part (1) does not drive the second driving part (2) to rotate. The first driving part and the second driving part are spliced through the bearing, it is guaranteed that rotation of the first driving part does not drive the second driving part to rotate, and therefore a better effect is achieved.
Owner:WUXI QINGHE XIAOBEI TECH CO LTD

A double support steel belt elevator hoisting machine with a turning gear

The utility model belongs to elevator traction machine field, specifically is a kind of double support steel band elevator traction machine with turning gear device, including base, the rear end surface of base is equipped with the casing by bolt, the both sides of base are equipped with the shroud, the inside of base is provided with the shaft;Shielding lock in the both sides of base play the role of blocking steel band, bearing end cover lock in the front bearing position of shaft, can fix the position of bearing does not deviate, casing can determine the wire direction by different angle, it is convenient to install, through double support bridge type structure, dispersion bearing stress, the device adopts distal end bolt fixation, greatly enhanced concentricity. Reduce electromagnetic noise, adopt the turning gear device of rotor magnetic yoke end connecting structure, simple structure, it is convenient to install, compared with the traction machine before structural strength is improved, noise sound is small, small, also reduce the cost value of traction machine, increase safety by using steel band type connection compartment ladder.
Owner:CEG MOTOR SUZHOU

Stator punching sheet

The utility model relates to the technical field of generators, and discloses a stator punching sheet, which comprises a stator punching sheet body, the outer contour of the stator punching sheet body is provided with four arcs, and the appearance of the stator punching sheet body is provided with four cut edges. Eight 'W'-shaped weld grooves are circumferentially arranged on the outer contour of the stator punching sheet body, 30 'U'-shaped wire embedding grooves are circumferentially arranged on the inner contour of the stator punching sheet body, and a 'T'-shaped tooth portion is arranged between every two adjacent wire embedding grooves. According to the stator punching sheet, only a punching die of the stator punching sheet needs to be fixed, the original assembly mode of a generator is not changed, 30 U-shaped wire embedding grooves are circumferentially arranged on the inner contour, the utilization rate of materials is improved, the number of the U-shaped wire embedding grooves of the stator is changed, the efficiency of the generator can be improved, the waveform distortion rate is reduced, and the power generation quality is improved. Electromagnetic noise is reduced, reactive power consumption of the generator can be reduced, and output power of the generator is improved.
Owner:CHONGQING KECEN MOTOR MFG

Quick-release mounting type travel charging adapter

The utility model discloses a quick release installation type travel charging adapter, which relates to the technical field of power adapters, and comprises an upper mounting rack, the top end of the upper mounting rack is provided with an output interface, the side edge of the upper mounting rack is provided with an input interface, and one end of the top end of the upper mounting rack close to the output interface is provided with a power switch. And a quick dismounting mechanism for quickly dismounting the upper mounting frame is arranged on the side of the top end of the lower mounting frame. According to the quick-release mounting type travel charging adapter, the side of the upper mounting frame is pressed and pulled upwards, so that the positioning groove and the positioning block are separated, meanwhile, when the upper mounting frame moves upwards, a gap is generated between the fixing block and the fixing groove, and when pressure is applied to the side of the upper mounting frame, the gap is formed between the fixing block and the fixing groove. And the edge side of the fixing groove is synchronously driven to move towards the inner side, so that the fixing block and the fixing groove are separated, and the interior of the power adapter is conveniently overhauled.
Owner:DONGGUAN ZHIYU IND TECH CO LTD

Rotor punching sheet and permanent magnet motor thereof

The invention discloses a rotor punching sheet and a permanent magnet motor thereof, the rotor punching sheet comprises a sheet body and even number of synthetic magnetic poles, and the even number of synthetic magnetic poles are distributed on the sheet body along the circumferential direction; an arc corresponding to the outline of the outer circle of each combined magnetic pole and the shaft hole of the sheet body are eccentric, and a first notch and a second notch which are concave inwards are formed in the two ends of the arc respectively and are symmetrical about the midpoint of the arc. The arcs of the outer circle outlines of the combined magnetic poles are eccentric to the rotor shaft hole, and each arc is provided with the first notches and the second notches which are symmetrically distributed, so that uneven air gap distribution which is in a specific shape and is in a certain regular size is formed, which is equivalent to that very ingenious pole cutting treatment is performed on the rotor; the sine degree of air gap flux density can be optimized, the effects of weakening harmonic waves of all orders and reducing cogging torque are achieved, and vibration and electromagnetic noise are reduced while the efficiency of the motor is improved.
Owner:ZHEJIANG JIUZHOU NEW ENERGY TECHNOLOGY CO LTD

Power device and air conditioning system

The utility model discloses a power plant and air-conditioning system, including shell, stator, shaft body, rotor and cover body, stator is provided in the shell, rotor sleeve is provided in the peripheral side of shaft body and is located in the stator, the cover body sleeve is provided in the peripheral side of shaft body and is located in the shell, and the cover body is located in the shell. One of the inner peripheral wall of the shell and the outer peripheral wall of the cover body is provided with a positioning hole, the other one of the inner peripheral wall of the shell and the outer peripheral wall of the cover body is provided with a positioning part, and the positioning part is arranged in the positioning hole in a matched mode so that the cover body and the shell can be assembled and fixed. The electromagnetic noise of the power device is low, and part of components can be reused conveniently.
Owner:XIAOMI TECH (WUHAN) CO LTD +1

Air supply device and method for cathode closed stack or methanol fuel cell

The invention discloses an air supply device and method for a cathode closed electric pile or a methanol fuel cell. The device comprises a high-speed brushless direct current motor, a centrifugal impeller directly driven by the high-speed brushless direct current motor, a volute for packaging the impeller and an electronic control unit. The impeller and the volute are pneumatically optimized, so that the device has high efficiency and a wide stable working area under the back pressure of 1-10kPa. The electronic control unit takes the load current of the electric pile as a main feed-forward signal, quickly sets the target rotating speed of the motor through a built-in mapping table, and realizes accurate tracking by adopting a rotating speed closed loop. The control unit is integrated with mechanisms such as self-learning compensation, anti-disturbance quick response, safety protection and anti-integral saturation. According to the invention, the harsh requirements of a miniaturized fuel cell system on high back pressure, fast response, small size and long service life of an air supply component are met.
Owner:SICHUAN LIGHT GREEN TECH CO LTD

Quadruped robot joint motor parameter adaptive adjustment method based on fuzzy control

The invention relates to the field of quadruped robots, in particular to a fuzzy control-based quadruped robot joint motor parameter adaptive adjustment method. Comprising the following steps: S1, calculating a current error and an error change rate according to a current reference instruction and a feedback current; s2, dividing the current error and the error change rate into a minimum value, a small value, a medium value and a large value, performing fuzzification through a triangular membership function, forming a fuzzy set, and calculating the membership of the fuzzy set; s3, according to a fuzzy rule, obtaining fuzzy subsets and membership degrees of the proportionality coefficient and the integral coefficient; and S4, clear values of the proportionality coefficient and the integral coefficient are obtained through an inverse triangle membership function, and the clear values are transmitted to a current loop proportional-integral parameter. The control precision can be improved, the adaptability is enhanced, the electromagnetic noise influence is reduced, and the parameter adjusting process is simplified.
Owner:GUANGDONG BENNIU TECH CO LTD

A photoelectric detector and a photoelectric touch positioning method thereof

ActiveCN112817490BAvoid scanning blind spotsReduce electromagnetic noiseInput/output processes for data processingInformation processingBeam trajectory
The present invention provides a photodetector, comprising: a light scanning mechanism for emitting a light beam to scan the touch area of ​​a display screen; an information processing circuit, which is electrically connected to the light scanning mechanism; a detection unit, which is arranged on one side of the display screen and is electrically connected to the information processing circuit, and is used to detect the light spot of the light beam trajectory of the light scanning mechanism; wherein the information processing circuit includes a timing unit, and the timing unit is used to obtain the time equivalent corresponding to the light spot, and then determine the angular arc of the constant speed rotation of the light beam, and then determine the coordinate position corresponding to the light spot detected by the touch member on the display screen. The photodetector of the present invention emits a light beam through a light source, a motor, and an optical element fixed at one end of the motor, which can avoid the occurrence of a scanning blind area in the touch area of ​​the display screen, and has low electromagnetic noise and weak electromagnetic interference during use, and can achieve touch positioning with high precision.
Owner:SICHUAN IDAO TECH

Small dual-passband surface acoustic wave filtering anti-interference enhancement structure

ActiveCN224111148UReduce electromagnetic noiseQuality assuranceImpedence networksAnti jammingNoise
The utility model relates to the technical field of dual-passband surface acoustic wave filters, in particular to a small-sized dual-passband surface acoustic wave filtering anti-interference enhancing structure, which comprises a dual-passband surface acoustic wave filter body, a substrate is arranged on the dual-passband surface acoustic wave filter body, an electromagnetic shielding net is arranged in the substrate, a shielding ring is arranged on the periphery of the top end of the substrate, and the shielding ring is arranged on the top end of the substrate. According to the structure, the electromagnetic shielding net is arranged in the substrate, and the shielding ring and the arched shielding cover are combined to form a multi-angle surrounding electromagnetic shielding system, so that external radiation interference can be effectively inhibited, external interference can be reflected, and the electromagnetic shielding effect is improved. And electromagnetic noise entering the filter from different directions can be reduced.
Owner:SHENZHEN KHANATE ELECTRONICS CO LTD

Low-noise high-efficiency motor structure and scroll compressor

The utility model discloses a low-noise high-efficiency motor structure and a scroll compressor, belongs to the technical field of compressors, and aims to solve the problems of poor electromagnetic noise and poor operation efficiency of a motor for a scroll compressor. According to the technical scheme, the motor is characterized by comprising a plurality of stator punching sheets and rotor punching sheets, stator inner holes are formed in the stator punching sheets, the rotor punching sheets are located in the stator inner holes, a plurality of magnetic poles are arranged on the sides, close to the rotor punching sheets, of the stator punching sheets, and a plurality of air gaps are formed between the cambered surfaces, close to the rotor punching sheets, of the magnetic poles and the outer ring surfaces of the rotor punching sheets; the rotor punching sheet is concentrically provided with a rotating shaft hole, the outer ring surface of the rotor punching sheet is composed of a plurality of arcs connected end to end, and the circle center of at least part of the arcs does not coincide with the circle center of the rotating shaft hole, so that the length of an air gap between the stator punching sheet and the rotor punching sheet is increased, and an unequal-distance air gap structure is realized. The formation of the non-equidistant air gaps is helpful for perfecting the positive rotation of the back electromotive force waveform, so that the torque ripple is reduced, the overall performance is improved, and the effect of reducing the electromagnetic noise is realized.
Owner:SUZHOU ZHONGCHENG NEW ENERGY TECH CO LTD

Air conditioner control method, electronic equipment, storage medium and air conditioner

The invention relates to the technical field of intelligent electric appliances, particularly provides an air conditioner control method, electronic equipment, a storage medium and an air conditioner, and aims to solve the technical problem that serious electromagnetic noise occurs when an air conditioner motor runs. In order to achieve the purpose, the method comprises the steps that the three-phase current of a motor is obtained in response to operation starting of the air conditioner; obtaining a corresponding operation voltage value based on the three-phase current; judging whether the running voltage value is within a preset voltage range or not; and if not, acquiring a corrected voltage value corresponding to the operation voltage value, and controlling the motor to operate based on the corrected voltage value. Through the implementation mode, the operation voltage can be calculated through the three-phase current, whether the operation voltage is in the normal voltage range or not is judged, and if not, corresponding correction is carried out in time according to the abnormal condition to keep the stability of the input voltage of the motor, so that the rotating speed of the motor is stable, electromagnetic noise generated during operation of the motor is reduced, and the service life of the motor is prolonged. The satisfaction degree of a user to the air conditioner is improved, and the use experience of the user is improved.
Owner:QINGDAO HAIER AIR CONDITIONER GENERAL CORP LTD +2