35results about How to "Small excitation power" patented technology

The invention relates to a composite high-efficiency high-flow servo valve. The technical scheme is as follows: the servo valve consists of a composite flow valve and a composite magnetic control motor, two ends of the composite flow valve are respectively connected with a left haft part and a right half part of the composite magnetic control motor. A first electromagnetic converter [2] and a displacement sensor [44] are concentrically arranged in a left shell [3] from left to right in sequence; a valve core [5] is movably arranged in a valve sleeve [11] that is fixed in a valve body [8]; an angle displacement sensor [37], a second electromagnetic converter [19], a left sliding bearing [35], a gear shaft [28] and a right sliding bearing [29] are concentrically arranged in a right shell [17] from left to right in sequence; one side of the gearing shaft [28] is provided with a rack [31] that is meshed with the gear shaft [28]; and one end of the valve core [5] of the composite flow valve is in contact with an end surface of a first electromagnetic memorial alloy [45], and the other end of the valve core [5] is fixedly connected with a second magnetic control memorial alloy [36]. The servo valve has the characteristics of high frequency response, high reliability, high flow, small volume, small leakage, compact structure and high precision.

The invention discloses a self-boosting doubly-salient brushless direct-current power generation system. An armature winding and two excitation windings which are in magnetic coupling mutually are arranged in a doubly-salient motor of the self-boosting doubly-salient brushless direct-current power generation system. The armature winding, a bridge rectifier circuit, the first excitation winding, a diode, a first power switch tube and a capacitor are respectively and sequentially connected, the second excitation winding is sequentially connected with an asymmetrical half-bridge circuit and a direct-current excitation source, an engine detecting and controlling unit is used for detecting the output voltage, the output current and the excitation current of the power generation system and controlling the duty ratio of the asymmetrical half-bridge circuit and the first power switch tube. The invention further discloses a control method of the self-boosting doubly-salient brushless direct-current power generation system. According to the method, under the conditions of the constant rotation speed and the variable rotation speed, the efficiency and the output power of the power generation system are improved through coordination control of the duty ratio between the excitation current and the first power switch tube.

The invention discloses a novel four-hole site coil integral force transducer based on the principle of piezomagnetic effect. The force transducer comprises a transducer piezomagnetic body, a horizontal hole site, a horizontal coil W1.2, a vertical hole site, a vertical coil W3.4, a differential rectification output circuit, an excitation transformer and a low-frequency excitation power supply. In the invention, a horizontal hole site measurement coil and a vertical hole site compensation coil in a measurement area are completely separated; based on the inherent characteristic of the magneticbody material that the longitudinal magnetic conductivity parallel to an external force F is very sensitive to stress while the transverse magnetic conductivity vertical to the external force F is not sensitive to the stress, the measurement circuit is designed as an inductive four-wall balanced bridge according to the electric principle; and the bridge output is in a current rectification and resistance voltage reduction mode so as to realize an integral optimization measurement circuit with three-wire excitation, differential compensation and DC (direct current) output.

The invention belongs to the linear motor and linear motor driving field and relates to a high-efficiency high-thrust double-sided linear motor with an excitation regulation function. Double-sided primary sides and a double-sided secondary side located between the double-sided primary sides are matched with each other so as to form the double-sided linear motor; the double-sided secondary side is composed of at least one group of magnetic flux concentrators and magnets which are installed in a surface-mount manner alternately, the magnetizing directions of adjacent magnets face each other or depart from each other; each magnetic flux concentrator is provided with an excitation coil; the magnetic flux concentrators provide a passage for the series and parallel magnetic path of double-sided secondary permanent magnets, direct current excitation and double-sided primary sides; magnetic resistance is small, leakage flux is decreased greatly and is even completed eliminated; an excitation regulation ability is increased significantly; a bottleneck problem that restricts the engineering application of a linear motor for a long term is solved; and under the same size and manufacture cost, the power and output of the motor can be greatly increased, or under the same power, the size, manufacture and use cost of the motor can be greatly decreased. The linear motor of the invention is particularly applicable to to high-thrust, high-power and long-stroke linear motor engineering application conditions which require magnetic levitation guide control.

The invention discloses a low-power consumption spectral lamp device of a rubidium atomic frequency standard. The device comprises a spectral lamp, a radio frequency oscillation circuit, a constant temperature sleeve and a constant temperature control circuit, wherein the radio frequency oscillation circuit drives the spectral lamp to produce pump light; the constant temperature sleeve is covered on the spectral lamp; the constant temperature control circuit is used for controlling the constant temperature sleeve to keep constant the temperature of the spectral lamp; the radio frequency oscillation circuit comprises a filtering circuit, an amplification circuit and an oscillation frequency selection circuit which are sequentially connected; the amplification circuit comprises a transistor, a first biasing resistor, a second biasing resistor and a positive temperature coefficient thermistor; the first biasing resistor is connected between the collector and base of the transistor; the second biasing resistor is connected in series with the first biasing resistor; and the positive temperature coefficient thermistor is connected in parallel with the second biasing resistor, and is arranged in the constant temperature sleeve. The spectral lamp device provided by the invention has low power consumption, is convenient to use, and can improve the output frequency stability of the atomic frequency standard.

The invention discloses an earthquake-resistance shock-absorption damping device for a building. The earthquake-resistance shock-absorption damping device is characterized by comprising an upper connecting part, a buffer part and a lower connecting part, wherein the upper connecting part comprises a plurality of layers of steel plates, channel steel, an earthquake monitoring alarm device and expansion bolts; the plurality of layers of steel plates are connected with the channel steel by welding; the earthquake monitoring alarm device is mounted on the channel steel; the upper connecting part is fixed with the building by connecting through the expansion bolts; the buffer part is mounted between the upper connecting part and the lower connecting part by welding; the lower connecting part is fixed with the building by connecting through the expansion bolts; the earthquake monitoring alarm device can be used for timely finding occurrence of an earthquake and earthquake intensity; and the buffer part is great in deformation strength and is clear in stress. The earthquake-resistance shock-absorption damping device is creative design scheme, and is beneficial to popularization and application.

The invention provides an iron-based amorphous alloy as shown in a formula (I), wherein each of a, b and c represents the atom percentage of a corresponding component, a is larger than or equal to 80.0 and is smaller than or equal to 82.0, b is larger than or equal to 11.0 and is smaller than or equal to 13.0, c is larger than 6.5 and is smaller than or equal to 8.0, and the sum of a, b and c is 100. The invention provides an iron-based amorphous alloy strip, and the saturation induction density of the alloy material is not lower than 1.60T. The application also provides a preparation method of the iron-based amorphous alloy, further, heat treatment can be carried out in a wide heat treatment range, the iron-based amorphous alloy strip with good soft magnetic property can be obtained, and the alloy material can be used as an iron core material or a magnetic core material for manufacturing power transformers, power generators and engines; and FeaBbSic is as shown in (I).

The invention discloses a flywheel pulse synchronous generator system with an embedded permanent magnet rotor, belongs to the field of motors, and aims to solve the problems of low power density, lowenergy density and large volume weight of the system caused by long shafting and low rotating speed of an existing flywheel pulse generator set, of which the reliability is low and the cost is high.The system comprises an input inverter, an input motor, an embedded permanent magnet rotor synchronous motor, an output rectifier, an exciting current adjusting unit and an inertia flywheel, wherein the output end of the input inverter is connected with a leading-out wire of the input motor; the armature winding output end of the embedded permanent magnet rotor synchronous generator is connected with the alternating current input end of the output rectifier, and the armature winding output end of the embedded permanent magnet rotor synchronous generator is connected with the exciting current adjusting unit in parallel; a rotor of the input motor, a rotor of the embedded permanent magnet rotor synchronous generator and the inertia flywheel are coaxially connected. The system can be used asa high-capacity pulse power supply, and has a good application prospect in the fields of nuclear fusion test technology, plasma and electromagnetic emission technology and the like.

The invention provides a magnetic property measurement system and method for a magnetic material. The measurement system comprises a digital signal generator, a full bridge inverter circuit, a filtercircuit, a magnetic material monolithic tester and a data acquisition device. Four absorption capacitors of the filter circuit are connected in parallel with four switch tubes of the full bridge inverter circuit to realize coupling with the full bridge inverter circuit, so as to filter out overshoot and oscillation generated in the switching process of the switch tubes, effectively inhibit the interference of a peripheral circuit, and improve the measurement accuracy of the magnetic field intensity in the magnetic property measurement process of the magnetic material.

The present invention relates to a magnetic control valve-free pulsation type blood pump, belonging to the field of blood pump technology. It includes controller, valve-free pump and driver. The valve-free pump is connected with driver by means of connecting bar on the valve-free pump, the driver is connected with controller by means of control winding on it, and the controller can be used for controlling whole working process of said blood pump.

The invention discloses a T-level high-field superconducting magnet system for a space propulsion ground simulation environment. The T-level high-field superconducting magnet system comprises a cold source transportation system (1), an upper thermal protection anti-electromagnetic interference cold source storage and supply system (2) and a lower plume-resistant shared magnetic circuit superconducting magnet system (3), the superconducting magnet system for propelling the ground simulation environment in the space for cooling the superconducting magnet from a 300K temperature zone to a 4.2 K temperature zone is provided. The system is applied to a large-space vacuum environment cabin and used for propelling plasmas. A superconducting magnet system for a space propulsion ground simulation environment comprises an upper thermal protection anti-electromagnetic interference cold source storage and supply system, a lower anti-plume shared magnetic circuit superconducting magnet system and amulti-channel long-distance low-heat-leakage cold source transportation system.

The invention discloses an orthogonally magnetized controllable resistor based on direct current memory flux magnetism helping and adjusting. The resistor comprises an alternating current working winding, an alternating current working iron core and a direct current memory flux orthogonal magnetism helping and adjusting device. The direct current memory flux orthogonal magnetism helping and adjusting device is composed of an orthogonal direct current working iron core, a direct current exciting winding, and an aluminum-nickel-cobalt permanent magnet with a direct current magnetic field memory function. Openings are formed in the two sides of the orthogonal direct current working iron core, a core column of the alternating current working iron core penetrates from the opening in one side of the orthogonal direct current working iron core, the aluminum-nickel-cobalt permanent magnet is embedded into the opening in the other side of the orthogonal direct current working iron core, the direct current exciting winding is wound around the aluminum-nickel-cobalt permanent magnet, and the alternating current working winding is wound around the alternating current working iron core. The resistor is simple in structure, the reactance is linear, and can be smoothly adjusted within a wide range, electromagnetic loading of the direct current exciting winding is greatly relieved through aluminum-nickel-cobalt magnetism helping and adjusting, and the running efficiency of a system is improved.

The invention relates to a hybrid excitation multi-phase reluctance motor and a power generation system, belongs to the field of motors, and solves the problem of narrow adjustment range of the magnetic field of the existing hybrid excitation reluctance motor. The air gap magnetic field is adjustable and the excitation loss is reduced by using the hybrid excitation electromagnetic structure of joint excitation of current and permanent magnets. The excitation winding and the armature winding are both arranged on the stator, and there is no brush or slip ring on the rotor. The system has high reliability and convenient maintenance, and the structure of the motor is changed by changing the winding mode of the excitation winding and the armature winding and the permanent magnet distribution mode. The system is suitable for the fields of power supply of airplanes, ships and locomotives, power generation of new energy sources such as wind energy, solar energy, ocean wave energy and the like,flywheel energy storage, electric vehicle drive and the like.

In order to solve the problems of long shafting of the entire unit and low power density and reliability of the system in the existing flywheel pulse generator set, the present invention provides an external rotor flywheel pulse synchronous generator system, which belongs to the technical field of motors and power electronics. The invention includes an input inverter, an input motor, an outer rotor permanent magnet synchronous motor, an output rectifier and an excitation current adjustment unit; The rotor of the synchronous motor is connected coaxially, the output end of the armature winding of the outer rotor permanent magnet synchronous motor is connected to the AC input end of the output rectifier; the output end of the armature winding of the outer rotor permanent magnet synchronous motor is connected to the excitation current adjustment unit; the motor is an anti-salient pole structure, when the motor speed drops, the output voltage adjustment of the system can be realized by controlling the output reactive current of the excitation current adjustment unit, the control is easy, and the excitation power is small.

A DC generator with high energy efficiency and a power generation method thereof are disclosed, a magnetic circuit structure for generate electricity is composed of a novel high-permeability material-iron-base nano-alloy material and a rare earth aluminum-iron-boron magnet, the biggest advantage is that a small excitation power can obtain a comparable power output, at that same power, the volume of the generator is much smaller than that of the conventional generator. When the rotor body is pus by the external force of the power device to rotate the N magnetic pole and the S magnetic pole alternately to excite the nano-microcrystalline iron core of the power generation coil, the nano-microcrystalline iron core is alternately changed by the magnetic field, and an induced current is generatefrom the coil. The invention can realize high-energy and high-efficiency power generation effect, and requires small external excitation power, the whole generator is small in volume, light in weight, energy-saving, large in power, strong in overload capacity, and the like, and has a wider use range.

The invention discloses a parallel hybrid excitation emergency generator for aircrafts and an application and a control method thereof. The emergency generator is driven by a ram air turbine. In emergency situations, the ram air turbine is released from the fuselage, and the ram air turbine is blown by the airflow to drive the emergency generator to generate electricity. The emergency generator isof a three-stage structure, is composed of a permanent-magnet auxiliary exciter, a main exciter and a main motor, and further includes a generator controller. The main motor of the emergency generator is a parallel hybrid excitation motor, and is divided into a permanent magnet part and an electric excitation part which share a set of main motor armature windings. The stator core is divided intosections. The magnetic circuits of the two parts do not influence each other, and the rotors of the two parts rotate coaxially. The emergency generator has the advantages of brushless excitation and simple magnetic regulation and voltage stabilization possessed by electric excitation motors and the advantages of small size, low weight and high power density possessed by permanent-magnet motors.

The invention discloses a flywheel pulse synchronous generator system with an embedded permanent magnet rotor, belongs to the field of motors, and aims to solve the problems of low power density, lowenergy density and large volume weight of the system caused by long shafting and low rotating speed of an existing flywheel pulse generator set, of which the reliability is low and the cost is high.The system comprises an input inverter, an input motor, an embedded permanent magnet rotor synchronous motor, an output rectifier, an exciting current adjusting unit and an inertia flywheel, wherein the output end of the input inverter is connected with a leading-out wire of the input motor; the armature winding output end of the embedded permanent magnet rotor synchronous generator is connected with the alternating current input end of the output rectifier, and the armature winding output end of the embedded permanent magnet rotor synchronous generator is connected with the exciting current adjusting unit in parallel; a rotor of the input motor, a rotor of the embedded permanent magnet rotor synchronous generator and the inertia flywheel are coaxially connected. The system can be used asa high-capacity pulse power supply, and has a good application prospect in the fields of nuclear fusion test technology, plasma and electromagnetic emission technology and the like.

The invention discloses an embedded electromagnetic multi-vertical-ring high-gradient magnetic separator. The magnetic separator comprises a rack, at least two separation vertical rings, a hollow mainshaft, a controller, a sliding ring set, an electric brush set, an angle position coded disc, an angle position sensor, a magnet exciting coil, magnetism gathering medium boxes, a washing water pipe,a concentrate hopper, an ore feeding pipe, a pulsation mechanism, a tailing pipe, a tailing channel, a feeding hopper, a feeding pipe, a separation vertical ring driving system, a pulsation driving system and a controller. The at least two sorting vertical rings are vertically arranged on the hollow main shaft in parallel through spoke plates. Each sorting vertical ring is provided with at leasttwo magnet exciting coils. The magnetism gathering medium boxes are embedded into the magnet exciting coils and fixed on the spoke plates. According to the invention, high-gradient magnetic field space limitation of a centralized electromagnetic high-gradient magnetic separator in the prior art is effectively broken through; the magnetic field utilization efficiency is improved; the separation efficiency is improved; and the energy consumption is reduced.

The invention discloses a brushless direct current motor, which is applicable in occasions that speed needs to be regulated for operation or no speed needs to be regulated but rotate speed is higher than 3000r / min. The brushless direct current motor has the main characteristics that on electromagnetic structure: an armature winding is arranged on a stator, winding elements, with phase differences of edges at integer polar distances, namely, with same phase, are in series or parallel connection to form a group to share a pair of outgoing lines; outgoing lines of grouped winding with phase differences of edges at two grooves or a plurality of grooves are in head-to-tail ligation, namely a closed ring is connected in a repeatedly changing type or a repeated wave type, so that the armature winding has fewest number of the outgoing lines. According to the brushless direct current motor, fewest electronic power switch elements are adopted for inversion, and the application quantity of the electronic power switch elements is not increased with the increase of the number of poles of the motor; a non-ferromagnetic magnetic stop band or a non-ferromagnetic groove for restraining armature reaction is arranged in the middle each pole of a pole wheel for half-and-half separate the poles, so that magnetic path and magnetic resistance of the armature reaction are increased, and only a tiny armature air gap can restrain the influence of the armature reaction on an air-gap field.

The invention discloses a pull rivet resultant magnetization grouping flaw detection method and a pull rivet resultant magnetization grouping flaw detection device. The method comprises the following steps: (1) arranging a stepping conveying mechanism, arranging a broadband closed circumferential magnetic path consisting of opened magnet yokes, pull rivets and gaps and circumferential magnet exciting coils, arranging axial magnet exciting coils, providing two controllable alternative current generation resultant magnetic fields, arranging a manual screw nut screw rod lifting mechanism which is fixed at the opened magnetic yokes, and arranging a demagnetization conveying mechanism; (2) manually adjusting the vertical heights of the opened magnet yokes; (3) starting the conveying mechanism, magnetic suspension spraying devices, a magnetization power supply, ultraviolet radiation lamps and the demagnetization conveying mechanism; (4) conveying; (5) spraying the suspension; (6) resultantly magnetizing; (7) inspecting a product; and (8) demagnetizing. When the flaw is detected through controllable automatically conveyed pull rivets, the operation is carried out by multiple operators, 50 to 60 pull rivets can be accomplished within 1 minute, and the efficiency is improved by about 20 times when being compared with that of single pull rivet flaw detection. Through once resultant magnetization, various cracks and fine defects on the surface and near surface of a workpiece can be comprehensively checked at one time, the workpiece is magnetized in a non-contact mode, the magnet excitation capacity is low, the magnet yoke height can be adjusted, and the magnetization sensitivity in magnetizing rivets of different diameters is ensured.

A hybrid excitation multiphase reluctance motor and a power generation system belong to the field of motors. The invention solves the problem of narrow adjustment range of the magnetic field of the existing hybrid excitation reluctance motor. By adopting the hybrid excitation electromagnetic structure in which the current and the permanent magnet are jointly excited, the air gap magnetic field can be adjusted and the excitation loss can be reduced; both the excitation winding and the armature winding are on the stator, and there are no brushes and slip rings on the rotor. The reliability is high, the maintenance is convenient, and the structure of the motor is changed by changing the winding mode of the excitation winding and the armature winding and the distribution mode of the permanent magnet. The invention is applicable to the fields of aircraft, ship, locomotive power supply, wind energy, solar energy, ocean wave energy and other new energy generation, flywheel energy storage, electric vehicle drive and the like.

The invention, which belongs to brushless generator field, discloses a double excitation-winding compound-excitation double-salient brushless direct-current generator. The double excitation-winding compound-excitation double-salient brushless direct-current generator comprises: a double excitation-winding compound-excitation double-salient motor, a rectification circuit and a filtering capacitor. An armature winding of the double excitation-winding compound-excitation double-salient motor, the rectification circuit, a first set of excitation winding of the double excitation-winding compound-excitation double-salient motor and the filtering capacitor are successively connected in series. A second set of the excitation winding of the double excitation-winding compound-excitation double-salient motor is connected with a direct current excitation power supply. Because of a self-excitation effect of the first set of the excitation winding, a generator voltage regulation rate is low and excitation power needed by control output is low. The generator is especially suitable for independent power supply systems, such as an electric automobile vehicle power generation system, an airplane power generation system and the like.