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

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 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 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.

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 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.