40results about How to "Improve excitation performance" patented technology

The invention discloses a switched reluctance generator converter and a control method thereof. The converter is composed of a converter main circuit and a self-excitation variable-excitation circuit,and totally comprises a three-phase winding, seven switching tubes, eleven diodes, eight capacitors, an inductor and one resistor; branch windings of each phase winding of the converter main circuitare connected in parallel during excitation of each phase winding, and are automatically connected in series during power generation; an output voltage is increased; the negative electrodes of the converter main circuit and the self-excitation variable-excitation circuit are in a common ground state; input and output currents of the self-excitation variable-excitation circuit are not interrupted during operation, and an output excitation voltage of the self-excitation variable-excitation circuit can be adjusted through a duty ratio of the seventh switching tube; other switching tubes except the seventh switching tube are all in a single pulse wave switching mode; and therefore, the whole converter can be strengthened and diversified in excitation, and is high in input and output electric energy quality, high in output voltage, low in switching loss, simple and convenient to control and suitable for the fields of various switched reluctance generator systems, especially high-speed low-power switched reluctance generator systems.

The invention discloses a bistable permanent-magnet operating mechanism dispersedly exciting on two sides of brake opening and closing working air gaps, which is suitable to be used for driving a contact terminal to move in single-phase, multi-phase high-voltage, intermediate-voltage and low-voltage switches and is characterized in that a main brake closing coil and an auxiliary brake opening coil are arranged on one side of a brake closing working air gap, and a main brake opening coil and an auxiliary brake closing coil are arranged on one side of a brake opening working air gap, wherein the main brake closing coil and the auxiliary brake closing coil are connected in series; and the main brake opening coil and the auxiliary brake opening coil are connected in series. The invention has favorable excitation effect; a moving iron core can obtain enough operation power in a whole movement process; the contact time and the movement time are reduced, the peak current of an exciting coil is reduced, the energy consumption of an energy storage capacitor is decreased, and the mechanical properties are well matched with brake opening properties and brake closing properties of the contactterminal.

The invention provides a two-phase electro-magnetic doubly-salient power sunroof drive motor. The two-phase electro-magnetic doubly-salient power sunroof drive motor is characterized by comprising a stator core (1), a mover (2), excitation isolating blocks (3), excitation windings (4), guide rails (7) and armature windings, wherein the stator core (1) is provided with a column of stator poles which protrude towards a y-axis direction; the elongated mover is located above the stator core (1); the mover (2) is provided with a column of mover poles which protrude towards a negative y-axis direction; one excitation winding (4) is arranged between every two stator poles; the excitation windings (4) are wound around an x-axis direction in which the length of the stator core (1) is located; the adjacent excitation windings (4) are opposite in winding direction; the armature windings are wound around the stator poles; the A-phase armature winding and the B-phase armature winding are arranged at an interval; the mover (2) is connected to a sunroof; the stator core (1) is connected to a car body; and the sunroof can be opened or closed when the mover (2) moves. The two-phase electro-magnetic doubly-salient power sunroof drive motor is free of a turbine worm reducer, and is light in weight, small in thickness and high in transmission efficiency.

The invention discloses an arc stabilizer for underwater wet welding. The arc stabilizer comprises a high-pressure gas inlet pipeline, a shielding gas inlet pipe, a solder wire, a cooling water inlet pipeline, a cooling water outlet pipeline, a conducting rod, a blocking plate, a welding nozzle, iron cores, magnet exciting coils and a protective cover. The whole device is in a cylindrical structure which is covered by the protective cover and is sealed except gas and water inlet and outlet pipes, the protective cover is made of an insulating material and is insulated from a conducting nozzle, a high-pressure gas pipeline is arranged inside the protective cover, and gases enter the device from the high-pressure gas inlet pipeline on the upper portion. The conducting rod is arranged at the center, the solder wire penetrates through the middle of the conducting rod, a circle of shielding gas channel surrounds the conducting rod, and shielding gases enter the device through the shielding gas inlet pipe. Four iron cores are arranged on the external circle, and magnet exciting coils are twined in the middle of iron cores. Cooling water is filled around iron cores and is injected from a water inlet pipeline, and the water outlet pipeline is directly connected with environmental water. According to the arc stabilizer, a large amount of water is drained through high-pressure gases, a half-dry environment is produced for electric arcs in a water environment, and simultaneously, magnetic constraint is conducted through a magnetic control device to stabilize underwater welding arcs.

Disclosed is a high-voltage current conversion system of a switch reluctance wind power generator. A switch reluctance generator is used as a main wind power generator, and the output electric energyof a permanent magnet direct current generator coaxially connected with the switch reluctance generator is used as exciting electric energy of the switch reluctance generator; each phase of winding ofthe switch reluctance generator comprises two branches which are connected in parallel in excitation while in series in power generation, thereby strengthening the excitation effect; in power generation, the direct current power supply needed by excitation and a charged capacitor in excitation are both connected with the corresponding phase winding to be participated in power generation output, thereby highly improving the output voltage; and the whole current conversion system is high in expandability, high in reliability, simple in structure, easy to control, low in loss and suitable for medium-low-power wind power and medium-high-voltage direct current grid connection or direct current load power utilization fields.

A direct boost variable power generation voltage variable excitation non-isolated switch reluctance generator conversion system is formed by nine diodes, nine switch tubes, a three-phase winding, fourcapacitors, and three inductors. During each phase winding excitation and power generation operation, a power generation voltage value is naturally increased. Through a fifth switch tube (a first phase winding, other corresponding ones), continuously changing power generation voltages can be further obtained. Through a ninth switch tube which is the only switch tube, under the condition that an isolation link is not needed, continuously variable excitation voltages can be acquired and can directly participate in power generation output. Simultaneously, a storage battery is abandoned and an excitation design is reinforced. Based on that, a problem that a power generation voltage is continuously adjusted by the conversion system is solved, and an excitation voltage directly affects an output power generation voltage; controllability is enhanced; and with a simple structure and control, flexibility and adaptability of the system are greatly improved. The system is suitable for various low-power compact high-speed switch reluctance generator system fields.

The present invention provides a quantum dot backlight module, which includes a quantum dot film arranged on a side of the light guide plate that is distant from the light reflector board and an optical coating layer arranged on a side of the quantum dot film that is distant from the light guide plate, or alternatively includes a quantum dot tube arranged between a light guide plate and a backlight source and an optical coating layer arranged on a side of the light guide plate that is adjacent to the quantum dot tube, so that for the purpose of emission of white backlighting, the optical coating layer is used to reflect a part of monochromatic light emitting from the backlight source toward the quantum dot film or the quantum dot tube for re-excitation for light emission so as to increase excitation performance of the quantum dot film or the quantum dot tube, improve brightness and gamut of the quantum dot backlight module, and enhance product quality.

The invention provides an electromagnetic control mechanism, which comprises a shell, a coil and a plunger, wherein the shell forms the outline of the electromagnetic control mechanism; the coil is used for generating an electromagnetic force acting on the plunger by current; the plunger is positioned in the coil; the coil consists of a pull-in winding and a holding coil; the numbers of turns of the pull-in winding and the holding coil are equal; and the center of gravity of the coil is not positioned at a half of the length of the coil.

The invention relates to a motor special for a motor train unit locomotive, in particular to a plate type aluminum alloy gear motor. The plate type aluminum alloy gear motor comprises a motor casing, a front end cover, a rear end cover, a rotor support, a motor rotating shaft, a front bearing, a rear bearing and a gear. The rotor support is fixedly connected to the motor rotating shaft. An annular magnetic plate for carrying out magnetizing through multiple poles is fixed to the rotor support. A stator winding located beside the annular magnetic plate is fixed to the front end cover. Stator iron cores are fixed to the two sides of the annular magnetic plate respectively. Front halves of the stator iron cores are fixed to the front end cover, and rear halves of the stator iron cores are fixed to the rear end cover. Front stator teeth and rear stator teeth are fixed on the front end cover and distributed on the same circumference, and front stator teeth and rear stator teeth are fixed on the rear end cover and distributed on the same circumference. According to the improvement, a gland flange is arranged between a lead connector and wiring port base on the motor casing and fixes a sealing hole ring into a port base inner hole of the wiring port base. An inner-ring-free bearing is arranged between the outer end of a bending moment resisting component and the gear, and an aluminum alloy coating is arranged on the surface of a supporting circle of the bending moment resisting component.

The invention relates to a direct-boosting doubly-fed switched reluctance generator current transformation system, which is composed of a storage battery, ten switch tubes, a three-phase winding, ninediodes, eight capacitors and two inductors, and is characterized in that the total output voltage is boosted directly under the condition of parallel connection of each phase output while the excitation and power generation of each phase winding, the problems of strengthened excitation and simultaneous work of two phase windings are solved at the same time, the switch tubes are not additionally increased, and the separated excitation storage battery can be automatically charged. Meanwhile, an automatic charging current transformation loop is utilized and can carry out backward feedback energyfeed after only fine adjustment, so that the cost performance and the adaptability are greatly improved, and the whole system is low in switching loss and high in output electric energy. The direct-boosting doubly-fed switched reluctance generator current transformation system is applicable to the field of low-power high-speed switched reluctance generator systems with various power inputs.

The invention provides a device and method for electromagnetic pulse welding of a high-strength pipe fitting assisted by coil induction heating. The device comprises a magnetic collector and a heater adjacent to the magnetic collector. The magnetic collector comprises an excitation device capable of containing the first pipe fitting welding end and the second pipe fitting welding end. The heater comprises an induction heating coil capable of penetrating through the first pipe fitting and heating the first pipe fitting; during welding, the first pipe fitting is arranged at the induction heating coil in a penetrating mode, the welding end of the first pipe fitting and the welding end of the second pipe fitting are both arranged in the excitation device of the magnetic collector, when the induction heating coil heats the first pipe fitting to the threshold value range, the induction heating coil is powered off firstly, then the excitation device is powered on immediately, and then the first pipe fitting is welded to the second pipe fitting. Enabling the first pipe fitting to impact the second pipe fitting under the driving of magnetic force so as to complete electromagnetic welding; the electromagnetic pulse welding method is beneficial to reducing the strength of the outer pipe fitting, improving the impact speed of the outer pipe fitting, forming a good impact angle, improving the quality of a welding joint of the dissimilar metal pipe fitting and expanding the application range of electromagnetic pulse welding.