30results about How to "No electromagnetic noise" patented technology

The invention discloses a double-piezoelectric beam driven diaphragm pump, belonging to the technical field of micro fluid pump in precision machinery, comprising a cavity, two double-piezoelectric beams, a diaphragm with one-way valve and electrodes, where one end of each double- piezoelectric beam is fixedly supported and the other end is connected with the side of the diaphragm, an AC voltage is applied on the double- piezoelectric beams in the cavity to drive the diaphragm to vibrate at resonance point, and under the action of the one-way valve on the diaphragm, the air flows in a direction to exchange with external gas. And it has many advantages of simple structure, large output flow, low power consumption, small size of side surface, no electromagnetic noise, fewer active parts, high reliability, etc, easy to spread and apply.

The invention discloses an ultra-silent rolling-swinging switched reluctance motor. Two lateral-acting guide rails (6) are longitudinally arranged on a planar-frame-form base (7), a rubber spring (12) is mounted on each of two sides of each guide rail (6), a C-shaped magnet (10) is mounted on each rubber spring (12) in a mutual-mirroring manner, an excitation coil (11) is mounted on the C-shaped magnet (10), an arch-shaped swing wheel (1) is mounted on each of two longitudinal sides of a planar-frame-form top frame (2) in a stacked manner, the arch-shaped swing wheels (1) and the guide rails (6) are matched to enable the top frame (2) not to longitudinally move when the swing wheels roll and swing leftwards and rightwards, an armature (3) is mounted on each of two sides of each arch-shaped swing wheel (1), and the armatures (3) enter the middle of the C-shaped magnet (10) when the top frame (2) rolls to a preset position on one side from a central balance position. The ultra-silent rolling-pendulum switched reluctance motor is simple in structure, safe and reliable to run and ultra-silent, integrates a rolling mode with a swinging mode and can be matched with equipment like various infant bassinets, adult rocking chairs, couches, shaking beds, wooden horses or industrial sieves.

The invention discloses an inductance ballast iron core, which belongs to the technical field of inductance ballast iron core manufacturing. The inductance ballast manufactured by adopting the technology of the invention is safe and reliable in long-term operation, has stable electrical performance, and does not generate electromagnetic noise caused by the magnetic gap of the iron core. To this end, a solder joint of non-ferromagnetic material is welded between two opposing core end faces around the magnetic gap and forms an alloy connection.

The invention discloses a speed control device of an outdoor draught fan of an air conditioner. The speed control device of the outdoor draught fan of the air conditioner comprises a driving circuit, a transformer with multiple levels of outputs, a contactor and a switching control module. According to the speed control device of the outdoor draught fan of the air conditioner, the transformer with the multiple levels of outputs is adopted, switching of the different levels of outputs of the transformer is achieved through the controllable contactor when the device works, and the switching control module carries out control switching on the contactor based on detected working pressure of the air conditioner so that the draught fan can correspondingly work under the condition of different voltages and then can operate at corresponding rotating speeds and be matched with the working pressure of the air conditioner. The speed control device of the outdoor draught fan of the air conditioner has the advantages of being low in cost and free of influence of electromagnetic noise during work. Compared with a chopping voltage reducing speed control device, the speed control device of the outdoor draught fan of the air conditioner has the advantages of being capable of reducing cost, free of low-frequency noise and low in failure rate.

The invention relates to an electric fuel pump of a direct-current permanent magnet brushless car, which mainly consists of a power supply plug, a fuel injection nozzle, a controller, a bearing block I, a shell body, a stator, a permanent magnet rotor, a fuel pump nozzle, a filter packet, a clamp ring, a turbine, a bearing block II, a screw and a sealing ring; the controller controls the stator which is an ABC three-phase coil to alternately perform electrifying operation periodically to generate a periodic alternant magnetic field to drive the permanent magnet rotor to rotate at high speed and drive the turbine to rotate at high speed at the same time, therefore, the fuel is pumped into the electric fuel pump from a fuel tank by the filter packet and flows through the inner part of the electric fuel pump and finally is pumped out from the fuel pump nozzle, thereby providing stable and reliable fuel flow and pressure to a lower fuel system. The control parameters of the controller are changed according to the real fuel consumption of the car. The electric fuel pump of the direct-current permanent magnet brushless car has no abrasion to an electric brush, has high reliability and low power consumption, does not need electrical excitation, is maintenance-free, anti-corrosion and has high fuel injection pressure.

The invention relates to a material heat conduction analysis device based on a fluorescence method, and belongs to the field of material thermal property analysis. The material heat conduction analysis device comprises a probe (1), a photoelectric module and a data processing module. The probe (1) is used for detecting fluorescence sensing materials (7) on an object to be tested and transmitting detected optical signals to the photoelectric module through optical fibers (2). The photoelectric module coverts the received optical signals into electric signals, and converts the electric signals into temperature signals and then transmits the temperature signals to the data processing module. The data processing module obtains a temperature change curve according to the temperature signals, obtains a thermal diffusion coefficient of the detected object through comparison with standard data, and transmits the thermal diffusion coefficient to an upper computer for heat conduction analysis. The material heat conduction analysis device can be applied to measurement of thermal diffusion coefficients of gas, liquid and solid, is simple in structure, high in flexibility, and has the advantages of being better in measurement accuracy and anti-electromagnetic interference capacity, and achieving functions of miniaturization, intellectualization and online monitoring.

The invention provides an air conditioner, an alternating current motor and a speed adjusting device thereof. The alternating current motor speed adjusting device comprises that: a main speed regulation unit, wherein, an input terminal forms a main speed regulation input terminal which is connected with a controller, and an output terminal forms a main speed regulation output terminal which is connected with a plurality of live wire terminals of the alternating current motor; an auxiliary speed regulation unit which comprises a first branch and at least a second branch, wherein, the first branch and the second branch have a respective input terminal and a common output terminal, and the common output terminal forms an auxiliary speed regulation output terminal which is connected with a zero line of the alternating current motor; a shift selector, wherein, an input terminal of the shift selector forms an auxiliary speed regulation input terminal which is connected with the controller, and an output terminal is selectively connected with one of the respective input terminal of the first branch and the second branch, wherein, the first branch is a direct connecting branch and the second branch is a capacitive branch. According to the air conditioner, the alternating current motor and the speed adjusting device of the invention, a problem of electromagnetic noise when utilizing a chopper speed regulation principle to carry out speed regulation on a present alternating motor in the prior art is solved.

Provided is a wind power generation system. A homopolar electromagnetic transmission (HET) is adopted as infinitely variable speed and variable torque transmission equipment, the HET is directly connected with a wind wheel and an electric generator, a step-up gearbox is arranged between the wind wheel and the HET, the wind wheel can be in a horizontal shaft type or in a vertical shaft type, the horizontal shaft type wind wheel can be provided with fixed-pitch blades or variable-pitch blades, and the electric generator can be a conventional constant-speed moving synchronous electric generator or asynchronous generator. The operation of the system is mainly adjusted and controlled by the HET, and the wind wheel keeps the optimal tip speed ratio and variable rotation speed to operate under the conventional operation conditions. The wind power generation system has the advantages that the infinitely variable speed and variable torque transmission function with the rotation speed of the two ends being free and not limited is achieved; the flexible transmission connection isolates the bidirectional transferring of impact loads; the largest wind energy capturing efficiency is obtained; the power supply quality is high; the HET is higher in efficiency, lower in cost and small in electromagnetic interference, and does not generate electromagnetic noise and harmonic waves.

Provided is a method for manufacturing a radial iron core cake. The method includes the steps of cut sheet arranging, centrifugal sheet arraying and circle-narrowing forming. Magnetic conduction silicon steel sheets with different sheet widths are arrayed on a plate surface of a bearing plate in a radial mode, the bearing plate is rotated at a high speed so that all the sheets can be thrown to the outer edge of the plate surface under the action of centrifugal force to form a neat and loosely-arrayed sheet circle, an outer circle and partition plates are removed, a steel wire rope ring is fastened and a prefabricated insulating fixed ring is sleeved with the fastened steel wire rope ring after a central circle fixing pipe and a ground lead are inserted, the steel wire rope ring and the central circle fixing pipe are detached, and then the perfect-circle radial iron core cake is formed. According to the method, all the sheets are synchronously gathered towards the central circle fixing pipe under the action of constant-pressure even tightening force so as to be tightly extruded towards one another within the set circumferential range, and therefore the sheet overlapping coefficient and effective cross section filling rate are greatly increased. The practical test shows that electromagnetic noise caused by vibration among the sheets can not occur even when an electric reactor product formed by the iron core cake is influenced by electromagnetic force in an alternating magnetic field.

This invention relates to one magnetic field structure to generate electromagnetic sense and its feedback filter wave to eliminate move object on electron power parts, which comprises object to be eliminated or electricity wire of the feedback filter and its surround at least one pair of magnetic iron set relatively with same electrode and with adjacent magnetic electrode different. The invention can depress electron parts anti motion to lower power inner resistance to improve power efficiency and dynamic responding speed; compared with the degaussing method as application electromagnetic induction principle which generates alternating magnetic field by using alternating current of the coil in the geometric center of the coil, the invention, degaussing for animated object, is obvious high reliability, high efficiency and low cost.

The invention provides a pneumatic engaging and disengaging device for an overhead cigarette carton conveying line. The pneumatic engaging and disengaging device is sleeved on a main shaft through a steel sleeve, and comprises a plastic annular cylinder, a plastic movable gear and a plastic fixed gear, wherein the plastic annular cylinder is assembled on the steel sleeve through a big cylinder bearing and a small cylinder bearing; a plastic chain wheel is assembled on the steel sleeve through a chain wheel bearing; the plastic fixed gear is assembled on the plastic chain wheel and positioned on one side of the plastic annular cylinder; the plastic movable gear is positioned in the plastic fixed gear and contacted with the big cylinder bearing; a spring is positioned in the plastic movablegear and connected with one end of a spring head; the other end of the spring head is pressed against the chain wheel bearing; a forward buffer device is positioned in the plastic chain wheel; and a backward buffer device is positioned in the plastic fixed gear. By adopting a pure mechanical mode, the device has the advantages of high transfer force of single-way engagement and disengagement, high torque, no electromagnetic noise, no need of electric wire, no influence of current and voltage and capability of improving weather resistance, stability and greatly prolonging service life.