192results about How to "Avoid burning phenomenon" patented technology

The invention discloses a modular multi-connection control method and system. The control method comprises the following steps: determining the auxiliary engine capability requirement according to the total capability requirement of an indoor machine set and the best load point of a main engine; calculating the total number of the auxiliary engine compressors required to be input for the operation of the system according to the output capability of a single auxiliary engine compressor; and distributing the total number of the auxiliary engine compressors required to be input for the operationon average to each auxiliary engine, and distributing the parts which can not be distributed on average in each auxiliary engine one by one. According to the invention, through calculating the numberof the compressors required to be operated, the capability output of an outdoor machine set is basically and uniformly distributed to the main engine and each auxiliary engine of the outdoor machine set, the main engine and parts of auxiliary engine compressors are prevented from operating for a long time, the service life of each compressor of the whole machine set is prolonged, and the load energy efficiency ratio of the system part is improved greatly.

A separately controlled gas injection point coal underground gasifier and techniques, the method is achieved in the separately controlled gas injection point coal underground gasifier, the gasifier is installed with the wind hole (2) and wind tunnel (12), air gate (4) and the gas channel(6), oxygen tubes (3) are laid between the wind hole (2) and wind tunnel(12), the oxygen tubes (3) connects several certain distance separated of gas injection point controlling four-way pipe(8); a temperature sensor (13) is set at the four-way pipe position; blind hole (11)is set corresponding to the shutter A (25) and the shutter B (20) on the four-way pipe (8) position, along the coal bed both sides of the wind tunnel (12). The invention overcomes the coal wall combustion phenomena of bottom holes produced by the gasification of oxygen-enriched watered steam, avoid the wind tunnel plugging-up of bottom tunnels, ensure yield and quality of the gas; prevent the wind tunnel directly supply oxygen, guarantee the safety of gasification system; increase of controllability and stability of the gasification process through control to gas injection point and the corresponding loosened blind hole.

The invention discloses an LED (light-emitting diode) backlight source. The LED backlight source comprises a boosted circuit (210), a plurality of parallel LED strings (220), an over-current protection circuit (230) and a short-circuit protection circuit (240), wherein the boosted circuit (210) is used for boosting input direct current voltage and outputting boosted direct current voltage; each LED string (220) comprises a plurality of LEDs and a first resistor (221) which are connected in series, and each LED string (220) is used for receiving the boosted direct current voltage from the boosted circuit (210); the over-current protection circuit (230) is used for controlling the output power of the boosted circuit (210) according to the detected resistance; the short-circuit protection circuit (240) is used for controlling and regulating the resistance detected by the over-current protection circuit (230) according to voltages at two ends of the first resistor (221). According to the LED backlight source disclosed by the invention, when the resistor of one LED string is in short circuit, the output power of the boosted circuit is reduced to prevent a circuit device in a driving circuit from being burned up, and the security and reliability of the driving circuit are improved. The invention further discloses a liquid crystal display.

The invention provides an intelligent marshalling combination switch, comprising an AC electronic switch, a magnetic latching relay and a control circuit. The intelligent marshalling combination switch is characterized in that the control circuit is connected with at least a group of combination switches; the structure of the combination switch is that the AC electronic switch is connected in parallel with the magnetic latching relay with one-way contacts; the parallel end is connected in series with the magnetic latching relay with bidirectional contacts and the other parallel end is connected with one end of a single-phase capacitor and one end of a discharge coil; the other end of the single-phase capacitor and the other magnetic latching relay with bidirectional contacts are connected in series with each other and are connected into a return circuit. The intelligent marshalling combination switch can lead the single-phase capacitor to be freely switched without disturbance between the phase lines of the three-phase AC circuit and between the phase line and the zero line of the three-phase circuit, realizes the star-delta unequal arbitray connection of the single-phase capacitor under the control of a controller, completes adjusting the asymmetrical active load of the transformer and compensating the reactive loads at the same time, leads the transformer to be changed from the asymmetrical running to the symmetrical running, saves the power energy, and leads the power supply to have high quality and reliable running.

The invention discloses a conveniently used energy-saving motor, which comprises a base, and is characterized in that the internal part of the base is provided with cavities which are arranged at equal intervals, the internal part of each cavity is fixedly connected to a first shock-absorbing spring, the top of the base is provided with an accommodating cavity, the upper part of the inner side wall of the accommodating cavity is fixedly connected with two symmetric limiting blocks, the inner side wall of the accommodating cavity is provided with two symmetric sliding slots, a movable plate matched with the accommodating cavity is placed in the accommodating cavity, the upper surface of the movable plate is contacted with the bottom of the limiting blocks. According to the conveniently used energy-saving motor, a simple air convection channel can be formed, the flowing speed of the air is accelerated, the head can be dissipated quickly, a phenomenon of burning loss of the motor is effectively avoided, the heat dissipation effect is good, a shaking force of the energy-saving motor can be effectively released, a shaking force of a storage box can be effectively buffered, the shake absorbing mode is more diversified, the shake absorbing performance is good, and the use is more convenient.

The invention discloses a source electrode driving module power supply circuit, a display panel and a display device, and aims at avoiding the adverse phenomena of burnout of a source electrode driving module due to oversized or undersized power supply voltage of the power supply circuit. The power supply circuit comprises a first voltage comparison module, a second voltage comparison module and a switch control module. The first voltage comparison module is used for comparing the size of an analog voltage signal and reference voltage of analog voltage. When the analog voltage signal is determined to be greater than or equal to the reference voltage of the analog voltage, a first signal is outputted to the switch control module. The second voltage comparison module is used for comparing the size of a digital voltage signal and reference voltage of digital voltage. When the digital voltage signal is determined to be less than or equal to the reference voltage of the digital voltage, a third signal is outputted to the switch control module. The switch control module is used for stopping outputting of the analog voltage signal when the switch control module receives the first signal or the third signal.

The invention discloses a lithium-ion battery negative pole piece, and a preparation method and the application thereof. The surface of the base of the negative pole piece is coated with a coating which is prepared by a composite coating material; the composite coating material mainly comprises the following components in parts by weight: 20 to 40 parts of inorganic particles, 0.2 to 0.6 part of bonding agent, 4 to 8 parts of organic particles with swelling property, 0.4 to 0.8 part of plasticizer and 60 to 66 parts of solvent. Compared with the prior art, a novel bi-layer electrode material is adopted; an inorganic-organic protective layer is added on the basis of the conventional electrode material, so that the mechanical strength and the thermal stability of the battery are improved; the contact between a negative pole and a positive pole can be avoided under extreme conditions; therefore, a combustion phenomenon is avoided. Compared with the technology of a separation membrane which adopts an organic-inorganic layer, the purpose can be achieved by only coating a layer of coating at one end of the negative pole of the bi-layer electrode; the coating process is simplified; the cost is saved.

The invention discloses a high efficiency intermeshing gear pump or motor, comprising an intermeshing gear pair which is constituted by an inner geared ring and a rotor, a pressure compensating lateral plate on the lateral side of the intermeshing gear pair, and a casing, wherein the intermeshing gear pair and the pressure compensating lateral plate are commonly arranged in the casing, the pressure compensating lateral plate can freely move along axial direction between the intermeshing gear pair and the casing. The invention adopts the pressure compensating lateral plate which can freely move along axial direction, which can effectively control the evenness of the running clearance between the intermeshing gear pair and the pressure compensating lateral plate to reach a perfect size, thereby balancing sealing force, reducing sealing stress of the sealing face between the pressure compensating lateral plate and the intermeshing gear pair, avoiding occlusal damage on part of the sealing face, and effectively controlling the inner leakage of the intermeshing gear pair along the radial and axial directions. The invention has the advantages of small inner leakage, and high capacity efficiency, which can be extensively applied in various hydraulic systems with low oildraulic viscosity and high working pressure.

The invention discloses a rapidly solidified aluminum matrix composite enhanced by SiCp particles. The rapidly solidified aluminum matrix composite is prepared from the following components by volume percent: 2.5-25% of SiCp particles, and the balance of rapidly solidified aluminum alloy or pure aluminum powder. The preparation method comprises the following steps of: cleaning and baking the SiCp particles by deionized water after high-temperature oxidation and pickling; then drying the rapidly solidified aluminum alloy or pure aluminum powder to obtain high-energy mixed powder after mixing the powder; and finally, orderly carrying out repeated extrusion and common positive extrusion on the high-energy mixed powder to obtain the rapidly solidified aluminum matrix composite enhanced by the SiCp particles. The rapidly solidified aluminum matrix composite enhanced by the SiCp particles has the advantages of high strength characteristics and high wearability. By adopting the preparation method disclosed by the invention, the rapidly solidified aluminum matrix composite enhanced by the SiCp particles prepared in manners of carrying out pretreatment and high-energy mixing on the SiCp particles and then carrying out repeated severe plastic deformation is even in distribution of SiCp particles, good in combination with a matrix interface, and isotropous in aluminum matrix composite.

The invention discloses a self-adaption variable speed matching method for cyclone cluster operating conditions. Two stage vane rotating speed can be matched according to the different operating conditions; wind pressure characters and range suitable for loading of a cyclone cluster can be expanded, the loads of two stage vanes are evenly distributed, burning of a second stage motor for small-flow operating conditions is avoided, operating efficiency of non-design operating conditions of the whole cyclone cluster is improved, and the efficient working range is enlarged.

The invention discloses a control method and a control device of a slow speed type electric valve. The control method is characterized in that a control box is internally provided with a ripple time relay, thereby achieving the purpose of adjusting the rotation speed of an electric valve motor and the running time in the opening and closing process. The control method not only can prevent a pipeline from generating a water hammer when the electric valve is rapidly opened and closed, and the deformation and detonation of the pipeline are avoided; and a valve electromotion device is prevented from abidingly operating for a long time, the burnt phenomenon of the valve electromotion device is avoided, the power of a motor is reduced, and the investment cost and operating cost are reduced.

The invention provides a railway carriage antifreezing solution and its preparing method, including the following components in weight precent: anhydrous calcium chloride 20-50%, alcohol 8-10%, and water 40-70%, and it can also adds in antirusting agent sodium nitrite in 1-2%. The preparing method: firstly adding water in a stirring jar, then adding in the anhydrous calcium chloride and stirring to fully dissolving them, eliminating foam, then stirring to the temperature at 19 deg.C-21 deg.C, adding in alcohol, adding in the antirusting agen, stirring for 30 minutes and then ending. It can ensure the vehicle skins do not freeze with the hydrous bulk materials in 10 hours in the open air, and thoroughly solves the freezing problem of the iron mine powder-like hydrous bulk materials in the winter, thus need not defreeze them in defreezing rooms to smoothly discharge, saving energy sources, shortening turnover cycle of railway carriages, reducing labor strength and reducing transport cost.

A DC / DC boost convert includes an input inductor connected with a positive electrode of an input DC power supply, a step-up converter connected with that positive electrode of the step-up convert, anda step-up converter connected with the step-up converter. A main switch unit has a high-voltage end connected with an input inductance and a low-voltage end connected with a negative electrode of aninput DC power supply; A first absorption capacitor connected in parallel with the main switching unit; An auxiliary switching unit having a high-voltage terminal connected in series with a resonant inductor and connected in parallel with the first absorption capacitor; An output capacitor connected in parallel to both ends of the main switching unit through an output diode which is positively conductive, and a first diode which is positively conductive is serially connected to the first absorbing capacitor. The invention provides a DC / DC boost converter, which not only can normally exert thevoltage rise suppression function of soft switching operation, but also can avoid the device burning phenomenon caused by timing disturbance caused by system disturbance and wrong operation of switching transistors and the like. In addition, the invention can minimize circuit loss, improve conversion efficiency of the converter, and reduce switching electromagnetic interference (EMI).

The invention relates to an amorphous brazing process for super nickel laminated composite materials. The amorphous brazing process comprises the following steps of: (1) cleaning surfaces, to be connected, of super nickel laminated composite materials and foil-shaped Ni-Cr-Si-B amorphous brazing filler metal before welding so as to remove oil stains and oxide films on the surfaces, and carrying out drying treatment; (2) placing the foil-shaped Ni-Cr-Si-B amorphous brazing filler metal between the super nickel laminated composite materials, and fixing members to be connected by using a stainless steel plate; (3) brazing the assembled members, to be connected, of the super nickel laminated composite materials in a vacuum heating furnace; and (4) controlling cooling speed to be 20-50 DEG C / min, cooling a vacuum chamber to be below 100 DEG C, and taking out a brazed member. According to the process, a favorably formed connector can be obtained without adding brazing flux, an operating requirement of a structural member of the super nickel laminated composite materials at the high temperature of 800-1000 DEG C is met, and the high-temperature performance of the super nickel laminated composite materials is exerted.

The invention relates to a bow raising air source system of a railway vehicle. The bow raising air source system of the railway vehicle comprises an installing frame which is provided with an air compressor. One end of the air compressor is connected with a socket through a cable, and the socket is connected with the compressor and supplies power to the air compressor through a plug. The other end of the air compressor is connected with a check electromagnetic valve through an air guiding pipe. The check electromagnetic valve is connected with the air inlet end of a drier and a safety valve through the air guiding pipe. A heater and a pressure switch are installed on the drier. A regenerative opening of the drier is connected with an air storage barrel through the air guiding pipe. The output end of the drier output supplied air through the air guiding pipe. A support is connected with the installing frame. The bow raising air source system of the railway vehicle is compact and reasonable in structure and firm in installation, an assembly is light, the motor burnout phenomenon cannot be caused easily, vibration is small, and the air leakage and electric leakage phenomena cannot be caused easily because vibration is small.

The invention discloses a pure magnesium or magnesium alloy surface thermal diffusion zincizing alloying method. A pure magnesium or magnesium alloy workpiece which is subjected to surface treatment is buried into an iron tank with pure zinc powder and is shaken to condense the zinc powder, and subsequently the iron tank is put into a heating furnace to be heated up. According to the pure magnesium or magnesium alloy surface thermal diffusion zincizing alloying method, as the pure magnesium or magnesium alloy workpiece which is subjected to surface treatment is buried into the iron tank with pure zinc powder and is shaken to condense the zinc powder, the workpiece is closely contacted with the zinc powder, the thermal diffusion zincizing on the surface of the pure magnesium or magnesium alloy workpiece is achieved under atmosphere, the situation that the operation is performed in vacuum or on the presence of inert gases is avoided, the diffusion time is shortened, the temperature is reduced, the phenomena that matrix tissue grows, the mechanics properties of a matrix are degraded and pitting or burning loss happens to the surface, are avoided, and moreover the method requires lowly on equipment, is easy to operate, low in cost and beneficial for application in industrial production.

The invention relates to a computer cooling device. The computer cooling device comprises a plurality of annular cooling metal fins; each annular cooling metal fin comprises a base, a heat absorbing layer, a heat-conducting layer and a cooling layer, wherein the heat absorbing layer, the heat-conducting layer and the cooling layer are all arranged on the base, the heat absorbing layer is located at the center of the base, the heat-conducting layer covers the heat absorbing layer, the cooling layer covers the heat-conducting layer; the base and the heat absorbing layer are made of the same materials which include 20%-40% of silicon, 30%-50% of copper, 5%-15% of gold and 10%-30% of aluminum in percentage by weight, and all the materials are evenly mixed together and then molded in a die-casting manner; the heat-conducting layer is made of materials including 20%-60% of aluminum and 40%-80% of copper in percentage by weight, and the materials are evenly mixed together and then molded in a die-casting manner; the cooling layer is made of aluminum. The computer cooling device is good in cooling effect and low in cost.

The invention discloses a transformer inductive reactive power stepped control device and method. The transformer inductive reactive power stepped control device and method have the advantages that the rapid automatic stepped switching of multiple groups of capacitors are realized, the accuracy is high, the response speed is fast, the power consumption is low, the cost is low, the reliability is high and the requirements on the rapidness and the real-time performance of the reactive compensation of low-voltage transformers are satisfied.

The invention provides an upright type double-shaft drilling and reaming tapping combined machine tool. The vertical type double-shaft drilling and reaming tapping combined machine tool comprises a pedestal, upright columns, an operating platform, two first oil cylinders respectively used for driving a drilling shaft and a tapping shaft to move up and down, a power device for driving the drilling shaft and the tapping shaft to rotate, and a main control device, and further comprises Z axis lead rails arranged on the upright columns, lifting frames movably assembled on the Z axis lead rails, Z axis transmission mechanisms for driving the lifting frames to move up and down, Y axis lead rails horizontally arranged on the tops of the lifting frames, middle dragging plates movably assembled on the Y axis lead rails, Y axis transmission mechanisms arranged between the middle dragging plates and the lifting frames, and X axis lead rails horizontally arranged on the tops of the middle dragging plates, wherein the operating platform is movably assembled on the X axis lead rail, and second oil cylinders for driving the operating platform to transversely shift are arranged between the operating platform and the middle dragging plate; and the main control device is connected with the second oil cylinders for controlling the operating platform to move between a drilling hole position and a tapping position. The upright type double-shaft drilling and reaming tapping combined machine tool has high rigidity in integral structure, simplicity in operation procedure, stability in precision and high efficiency.

The invention discloses a cable sealing structure of a submerged motor pump. The structure comprises a cable, a cable sealing ring, a gland nut, a cable sealing ring sealing surface and an upper end cover. The cable is sleevedly connected into the cable sealing ring; the cable sealing ring is fixed on the upper end cover by the gland nut; the cable includes a triple-phase line and a grounding wire, wherein the triple-phase line and the grounding wire are respectively sealed on the upper end cover; and a core wire of the triple-phase line is connected with a core wire of a motor lead through a clamping copper tube that is tightly wrapped by a heat-shrink tube and a waterproof adhesive tape. Compared with the prior art, the technology employed in the invention enables the provided cable sealing structure of a submerged motor pump to solve a cable sealing problem; besides, waterproof and moisture proof performances are realized; and it can be avoided that an electric pump motor is damaged due to water inlet or moisture absorption.

The invention relates to a liquid crystal display, a liquid crystal display substrate and a formation method thereof. The method for forming the liquid crystal display substrate comprises the following steps: forming a gate metal layer in a short-circuiting bar area and a pad area on a substrate and forming a gate electrode in a pixel unit area; sequentially forming a gate electrode insulation layer and an amorphous silicon composite layer which cover the gate metal layer and the gate electrode on the substrate; etching the amorphous silicon composite layer and the gate electrode insulation layer in the short-circuiting bar area and the pad area until the gate metal layer is exposed to form a short-circuiting bar area contact hole and a pad area contact hole; etching the amorphous siliconcomposite layer and reserving the amorphous silicon composite layer at a position corresponding to the gate electrode in the pixel unit area; forming a source / drain electrode metal layer on the gate electrode and the amorphous silicon composite layer and in the short-circuiting bar area contact hole and the pad area contact hole; and etching the source / drain electrode metal layer to form a source / drain electrode and a conducting channel in the pixel unit area and electrically connect the gate electrode metal layer with the source / drain electrode metal layer in the short-circuiting bar area. The liquid crystal display and the liquid crystal display substrate and the formation method thereof improve the reliability of a device and the efficiency of product quality analysis.

The invention discloses an anti-burn sugar boiler for sweet production. The anti-burn sugar boiler comprises a boiler. The boiler comprises a base. The bottom of the base is connected to a mobile device. A top cover covers the boiler body so that a closed space is formed. An air pump is used for feeding gas so that pressure in the boiler is improved and sugar is fast molten. Rollers are used for moving the boiler. Through the friction between a blocking plate and the rollers, the rollers are fixed so that the boiler is fixed and positioning and processing are convenient. A spiral blade shaft rotates to bring lower sugar to the upper part, and continuously stirs so that the heat is more uniform and the uniformity is high. A bow scraper plate and scraper sheets can scrap syrup adhered to theinner wall of the boiler so that long-term heating is avoided and burnt phenomenon is avoided.

The titanium and titanium alloy ingot heating method for cogging of titanium and titanium alloy ingot features the heating of cast ingot in soaking furnace. The heating process includes the steps of: setting isolating block with pits in the surface horizontally on the bottom of soaking furnace; leaning the cast ingot on the furnace wall with one end in the pit while maintaining some interval between adjacent ingots; and heating the ingot through maintaining in the furnace at 800 deg.c for 15 min, heating to set temperature of 900-1000 deg.c in the temperature raising speed of not higher than 60 deg.c / hr and maintaining in the temperature for 2.5 hr before discharging. The present invention has the advantages of low cost, simple technological process, etc.

The invention discloses an active optical fiber winding device and an optical fiber winding method for an optical fiber laser. The winding device is a radiating disc with a conical shape; continuously arranged winding slots are formed in the conical surface of the radiating disc; each winding slot is provided with two symmetrical slot walls; the section included angle alpha of every two slot walls is 90 degrees; an interval is remained between the adjacent optical fibers in the winding slots. Stress caused by the direct contact between the optical fibers is avoided, a better radiating effect is achieved and the burning loss phenomenon is avoided.

The invention discloses a self-transmission stacking device for sun sheet cutting and flattening. The self-transmission stacking device comprises a cutting device, a flattening device and a stacking device, wherein the cutting device comprises a mounting box; the inner side wall of the mounting box is fixedly connected with a cutting motor; the output end of the cutting motor is fixedly connectedwith a cutting wheel; a corresponding protective cover is mounted outside the cutting wheel; the lower end of the protective cover is fixedly connected with a water slot; the water slot is fixedly connected to the bottom wall of the mounting box, so that scraps generated during cutting are collected into the water slot, dust and scraps generated during cutting are avoided, and an accident caused by a combustion phenomenon of the scraps is prevented, sun sheets of different thicknesses and different widths can be grinded, compatibility of the machine is improved, and producing and processing efficiency is improved; automatic stacking is realized by additionally arranging structures such as a turnover plate, a trigger device and a stacking platform; and moreover, a worker conveniently packsafter stacking is accomplished, and therefore, the self-transmission stacking device is convenient and quick.

The invention discloses an automatic cover safety valve device for production of a storage battery and a safety valve. The structure of the automatic cover safety valve device comprises a lithium battery main body and a safety valve device. The lithium battery main body is provided with a lithium battery slurry cavity and an anode connection head. The safety valve device is provided with a pressure induction device, a power failure protection device, a pressure release device and a chemical gas filtering device. A safety air bag is promoted to expand by the pressure in a battery, a power-on trough plate and a connection plate are pushed to open when the safety air bag is expanded, a circuit is disconnected, an air outlet hole is opened through movement of a moving sealing strip, the rest of pressure in the battery is discharged and chemicals contained in the gas are filtered to avoid the chemical reaction of the chemicals in the air to cause fire or explosion, and therefore, in a condition with no need for damaging of circuit connection, the battery can be used continuously after the pressure is discharged to avoid waste of the battery.

The invention provides a sealing material used between a coke oven protecting plate and an oven door frame. The sealing material is prepared from 100 parts by weight of a silica sol solution, 130-180parts by weight of aggregate and 15-17 parts by weight of an additive, wherein the aggregate is prepared from 45%-60% by mass of aluminium oxide particles, 20%-30% by mass of silicon dioxide particlesand 10%-35% by mass of talcum powder; the additive is prepared from a dispersant, a thickening agent and a water-based defoamer. The invention further provides a preparation method of the sealing material. The preparation method comprises steps as follows: firstly, the additive is added to the silica sol solution, the aggregate prepared from the aluminium oxide particles, the silicon dioxide particles and the talcum powder is added to a mixed solution and uniformly mixed, and the sealing material used between the coke oven protecting plate and the oven door frame is obtained. According to thesealing material, the coke oven protecting plate and the oven door frame can be sealed effectively, and the effect is remarkable; besides, construction is convenient, and labor intensity of an operator is greatly reduced.

The invention relates to burnt-out polar fleece fabric. The fabric is made by a burnt-out procedure and comprises surface yarns and bottom yarns, an alkaline burnt-out assistant is adopted in the burnt-out procedure, the surface yarns are made of polyester fiber, the base yarns are viscose fiber blended yarns, and the viscose fiber blended yarns contain the following materials by weight percentage: 10-20 percent of cotton fiber, 40-60 percent of viscose fiber and the balance of polyamide fabric. By adopting the burnt-out polar fleece fabric, the moisture absorption and heat preservation effect is better, and the burning phenomenon in the burnt-out process is avoided. The invention also provides a production method of the burnt-out polar fleece fabric. By adopting the production method, the burning phenomenon in the burnt-out process can be avoided, and the burnt-out polar fleece fabric produced by the method has better moisture absorption and preservation effects.

The invention provides a system and method for abating three-step frequency vibration of fan blades on an IN-PLANE. The system comprises a generator rotation speed measuring module, a comparator, a proportion integral controller, a band-pass filter, a differential module, a proportional gain module and a summing unit. The generator rotation speed measuring module is used for obtaining a measured value of the generator rotation speed, and the comparator is used for comparing the measured value of the generator rotation speed and a set value of the generator rotation speed. The proportion integral controller carries out the proportional integral operation on a comparison result and obtains a first control input value of generator electromagnetic torque, and the band-pass filter is used for extracting three-step inherent frequency signals of the fan blades on the IN-PLANE from the measured value of the generator rotation speed. The differential module is used for carrying out the differential operation on the band-pass filtration result, and the proportional gain module is used for carrying out proportional gain amplification on the differential operation result and obtaining a second control input value of the generator electromagnetic torque. The summing unit is used for carrying out superposition of the first input value and the second input value of the generator electromagnetic torque to obtain the set value of the generator electromagnetic torque. The set value of the generator electromagnetic torque is used for controlling electromagnetic torque of a fan, so that the three-step frequency vibration amplitude of the fan blades on the IN-PLANE is reduced.

The invention discloses a protection device of a closing coil. The device comprises a normally closed contact of a relay JD1 which is in series with a closing coil HD in a divide-shut circuit of a switch, and partial pressure sampling circuits, inverse circuits and a controlling protection circuit which are in series connection to control the on-off of the normally closed contact point of the relay JD1. wherein one of the two partial pressure sampling circuits is connected with the closing coil HD in the divide-shut circuit of the switch, the other is connected with an opening coil TQ in a closing circuit; the two inverse circuits are respectively connected with the two partial pressure sampling circuits and are used to transfer the output voltage of the closing circuit into the voltage capable of being received by the controlling protection circuit; the controlling protection circuit is used to control the on and off of the relay JD1 according to the collected voltage and preset time of the two partial pressure sampling circuits. The protection device of the closing coil is based on the principle of collecting voltage changes of the before and after patch of switch controlling closing loop and can timely control the disconnection of the circuit of the closing coil when the closing is not successful, thereby reliably avoiding the phenomenon that the closing coil is burned.