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

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.

The invention discloses a T-class high-field superconducting magnet system for space propulsion and ground simulation environment, comprising: a cold source transportation system (1), an upper heat protection anti-electromagnetic interference cold source storage and supply system (2) and a lower anti-electromagnetic interference storage and supply system (2) A plume shared magnetic circuit superconducting magnet system (3): providing a superconducting magnet system for propelling the ground simulation environment in a space where the superconducting magnet is cooled from 300K to 4.2K temperature zone. The system is applied in a large space vacuum environment chamber for plasma propulsion; a superconducting magnet system for space propulsion ground simulation environment includes an upper thermal protection anti-electromagnetic interference cold source storage and supply system, and a lower anti-plume shared magnetic circuit Superconducting magnet system and multi-channel long-distance low-leakage heat cold source transportation system.

The invention provides a resistance generating device for a magnetic control vehicle with a squirrel cage rotor flywheel, which comprises a magnetic conducting flywheel which is arranged on a support shaft, wherein a magnetic control vehicle frame is provided with an electromagnet, and a relative position between the electromagnet and the magnetic conducting flywheel meets a magnetic field generated while the magnetic conducting flywheel rotates around the support shaft to cut the electromagnet; and a squirrel cage conducting bar is poured in the magnetic conducting flywheel, and the magneticconducting flywheel and the squirrel cage conducting bar form a squirrel cage rotor. In the invention, as a squirrel cage structure of a motor rotor improved by the resistance generating device is arranged on the resistance generating device for the magnetic control vehicle to greatly improve resistance generation efficiency, the volume of the electromagnet and the magnetic conducting flywheel can be reduced properly, thus saving material cost, improving operating performance of the magnetic control vehicle, reducing exciting power required by the electromagnet, and having energy-saving advantage.

A hybrid excitation flywheel pulse synchronous generator system belongs to the technical field of motors and power electronics. The invention solves the problems of the existing flywheel pulse generator set that the shafting length of the whole set is long, and the power density and reliability of the system are low. The present invention mainly includes an input inverter, an input motor, an excitation inverter, an excitation generator, an excitation rectifier, a hybrid excitation multi-phase synchronous generator and an output rectifier. , high efficiency, small voltage adjustment rate, strong overload capacity and high reliability. The invention can be used as a large-capacity pulse power supply in the fields of nuclear fusion test technology, plasma and electromagnetic emission technology and the like.

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.

A modular flywheel pulse generator system belongs to the technical field of motors and power electronics. The present invention solves the problems of low power density, low energy density, and large volume and weight caused by long shafting and low speed of the existing flywheel pulse generator set; And low reliability, high cost problems. The invention includes an input inverter, an axial magnetic field structure multi-air-gap embedded permanent magnet rotor synchronous motor, an output rectifier and an excitation current adjustment unit; the state of the motor: the axial magnetic field structure multi-air-gap embedded permanent magnet rotor synchronous motor passes the input The inverter absorbs energy from the power grid, converts electrical energy into mechanical energy and stores it; generator status: the axial magnetic field structure multi-air gap embedded permanent magnet rotor synchronous motor converts mechanical energy into electrical energy, and supplies power to the load through the output rectifier; excitation current The regulating unit is used to control the air-gap magnetic field of the synchronous motor in the generator state, so as to ensure that the output voltage of the synchronous motor remains constant under the state of load and speed changes.

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 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 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 magnetic body 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, 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.

The axial magnetic field flywheel pulse synchronous generator system belongs to the field of motor and power electronics technology. In order to solve the problem of the existing flywheel pulse generator set with long shafting and low speed, the system has low power density, low energy density, large volume and weight, and low reliability. The problem. The output end of the input inverter is connected to the lead-out line of the input power winding of the axial magnetic field embedded permanent magnet rotor synchronous motor, and the output end of the output power winding is also connected to the AC input end of the output rectifier and the excitation current adjustment unit; the motor includes two Two stators and one rotor, the two stators are coaxially and symmetrically arranged on both sides of the rotor, and there is an air gap between the stator and the rotor; each stator includes a stator core and two sets of multi-phase armature windings, and two sets of armature windings Both are embedded in the slot of the stator core or fixed on the air gap surface of the stator core, and the corresponding phases of the input power windings on the two stators are connected in series. The invention has the advantages of simple control, high efficiency, small voltage adjustment rate, strong overload capacity and high reliability.