20results about How to "Reduce electromagnetic noise" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

The invention discloses a planar magnetic induction probe array for measuring the arc rotation angular velocity of a micro-cathode arc thruster, which specifically comprises a quartz shell (11), a measuring coil (12), a polytetrafluoroethylene sleeve (13), a probe base (14), a bonding pad (15) and a magnetic induction probe array structure (6) so as to measure the arc rotation angular velocity of the micro-cathode arc thruster. The invention designs a magnetic induction probe comprising a measuring coil and a magnetic induction probe array structure comprising a plurality of magnetic induction probes for measuring the rotation angular velocity of a discharge arc of single ignition of a micro-cathode arc thruster. Based on the Faraday's law of electromagnetic induction, the change condition of the magnetic flux on the coil is measured, and the change of an instantaneous high-frequency magnetic field in time and space is accurately captured through a special magnetic induction probe arrangement mode, so that the measurement of the arc rotation angular velocity of the micro-cathode arc thruster is realized.

The utility model relates to the technical field of motor stators, in particular to a stator punching sheet which comprises an integrally annular yoke portion, tooth portions evenly distributed along the circumference are arranged in the yoke portion, a tooth groove is formed between every two adjacent tooth portions, one side, close to the yoke portion, of each tooth groove is in an arc shape, the other ends of the tooth portions are all provided with shoe portions, and the shoe portions are arranged on the yoke portion. The shoe part is arc-shaped, the arc length of the shoe part is smaller than that of one side, close to the yoke part, of each tooth groove, and heat dissipation grooves are evenly distributed in the surface, corresponding to the tooth grooves, of the yoke part. The torque output by the motor can be effectively improved, and meanwhile the service life of the motor can be prolonged.

The application relates to the technical field of virtual reality interaction, and discloses a multi-modal feedback VR device Bluetooth interaction system, which comprises a virtual reality host device, a Bluetooth communication link, a microcontroller unit and a tactile and olfactory feedback execution module. The microcontroller unit receives virtual physical event data by using a ring buffer which is maintained with a read-write pointer, and through an overlap strategy when a write pointer chases a read pointer and a timeout reset mechanism, the real-time performance and stability of instruction processing are ensured. The microcontroller unit runs a segmented control algorithm, maps a wind speed parameter into a pulse width modulation signal, and eliminates a motor starting dead zone. Meanwhile, a hardware timer is used to load a synchronous delay parameter, and a physical response time difference of tactile and olfactory feedback is accurately compensated. The application solves the problems of communication lag, control nonlinearity and sensory timing asynchronization in multi-modal feedback.

The utility model discloses a PID temperature control circuit applied to a microbial culture monitor. The PID temperature control circuit comprises a PID controller and a PID control circuit, the PID controller is used for receiving target temperature, incubation frame bias temperature and PID control parameters issued by the upper computer, receiving temperature parameters, sent by the PID control circuit, of all incubation frames in real time, conducting PID operation on the temperature parameters, outputting PWM adjusting signals to the PID control circuit according to operation results, and adjusting the temperature of the incubation frames by changing the output quantity of the PID control circuit. And the output power of the heating component or the refrigerating component is adjusted. The three-state buffer can buffer and isolate signals, prevent noise from interfering with the PID controller, protect the sensitive PID controller from being damaged by a rear-end circuit, and prevent residual output signals of the PID controller from influencing turn-off logic. In emergency, the output of the PID controller is cut off according to the emergency stop signal, so that the power switch device is quickly closed, the power output of the temperature control load is stopped, and the emergency stop function is realized.