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80results about How to "Improve the phenomenon" patented technology

Parallel type mixing-magnetic-material-based composite-rotor-contained magnetic flux switching motor

The invention discloses a parallel type mixing-magnetic-material-based composite-rotor-contained magnetic flux switching motor. A non-magnetic-conductive rotating shaft, an inner rotor, a stator, and an outer rotor are installed successively and concentrically from inside to outside at a radial direction in a sleeving mode. The stator contains stator iron cores, mixed permanent magnet modules and three-phase armature windings; the three-phase armature windings are arranged between the adjacent stator iron cores; one mixed permanent magnet module is embedded into the middle of each stator iron core tightly and fixedly; and each mixed permanent magnet module is formed by seamless connection of an internal neodymium iron boron permanent magnet, a ferrite permanent magnet, and an external neodymium iron boron permanent magnet from inside to outside along the radial direction. On the basis of the stator-free yoke-type structural design, obvious series magnetic circuits of the adjacent permanent magnets are formed on the magnetic flux paths by combining the composite rotor, thereby avoiding a phenomenon of supersaturation of the stator tooth part and effectively improving the utilization rate of the permanent magnet. The stator tooth employs a non-equal-arc design, so that the total positioning moment on the composite rotor is reduced and thus an effect of reduction of torque pulsation is realized.
Owner:JIANGSU UNIV

Motor load transient process calculation method suitable for electromagnetic transient simulation

The invention relates to the technical field of power grid transient simulation calculation and specifically relates to a motor load transient process calculation method suitable for electromagnetic transient simulation. The method can quickly calculate load transient characteristics of an induction motor under symmetrical and asymmetrical fault voltage sag of a power system, and is characterizedby (1) firstly, solving a first-order mechanical transient equation of a rotor to obtain changes in speed and slip of the rotor after disturbance; (2) solving a transient potential differential equation in the form of a rotor phasor to obtain change in transient potential; and (3) obtaining current and power response of the motor after the disturbance. Compared with PSCAD/EMTDC electromagnetic transient simulation results, the result of the calculation method verifies effectiveness of the algorithm; and compared with PSD/BPA electromechanical transient simulation results, the result of the calculation method shows the advantages of the algorithm under asymmetric voltage sag. An analytical method explicitly gives computation expressions of mechanical and electrical parameters of the induction motor after the disturbance; and in addition to being used to quickly evaluate mutual influence of the induction motor and the voltage sag, the method can also be used in stability analysis of thepower system.
Owner:GUANGDONG POWER GRID CO LTD +1

Hybrid magnetic-circuit torquer and flexible gyroscope comprising the same

The invention discloses a hybrid magnetic-circuit torquer and a flexible gyroscope comprising the same. The hybrid magnetic-circuit torquer of the invention is a three-row magnet steel hybrid magnetic-circuit torquer, in which a three-row permanent magnet steel ring forms a moving coil portion of the torquer which is fixedly connected with a flywheel rotor to rotate at high speed, and a fixed coil of the torquer is combined with a sensor to be secured to a gyro case. As such, the magnetic flux density B of the operating airgap magnetic field is increased, and the torque coefficient of the gyroscope is also increased, resulting in a maximum tracking angle rate above 600degrees/s of the gyroscope. With the flexible gyroscope using the hybrid magnetic-circuit torquer, the gyroscope's angular momentum H is decreased by setting the rotation speed of the motor properly. A low friction torque bearing C2206094JK is used in the gyro motor in order to reduce the friction toque. Also, by reducing the operating gap between the stator and the rotor, choosing the operating site properly, and maximizing the starting torque of the driving motor, the sync time of the gyroscope is made to be less than 5S and reduced to less than 2S in a high-voltage start-up and low-voltage operation mode, so as to meet high-speed operation requirements.
Owner:BEIJING INST OF AEROSPACE CONTROL DEVICES

Infrared axle temperature detection system modulation type probe infrared radiation modulation device and driving method

The invention discloses an infrared axle temperature detection system modulation type probe infrared radiation modulation device comprising a modulation driving board, a brushless DC motor and a radiation modulation disc. The modulation driving board comprises a power supply module, a control module, a power inversion module, a circuit protection module, a position signal processing module and a modulation signal processing module. When a wheel sensor in the train coming direction of the rail side detects passing of a train, the wheel sensor transmits a train passing signal to a control machine, and the control machine detects the signal and then transmits a modulation signal to an infrared probe. The modulation driving board receives the modulation signal and then drives the brushless DC motor to stably operate at the designated rotating speed in a high-speed way so as to drive the radiation modulation disc to rotate at the designated speed to modulate axle temperature infrared radiation of the train into radiation flux of which the amplitude continuously changes along with time. Advantages of the infrared axle temperature detection system modulation type probe infrared radiation modulation device are that the device is based on the principle of digital pulse width modulation and is high in precision, high in regulation speed, high in anti-noise performance, low in cost, low in power consumption, flexible to control and great in dynamic response.
Owner:BEIJING CTROWELL INFRARED TECHN

Novel power lithium battery aluminum-plastic film

The invention relates to the technical field of power lithium batteries, and especially relates to a novel power lithium battery aluminum-plastic film. The novel power lithium battery aluminum-plasticfilm sequentially comprises a protective outer layer, a bonding layer, a treatment layer, an aluminum foil layer, a special protective layer and a multifunctional inner layer from the outer surface to the inner surface, the protective outer layer is a polyethylene glycol terephthalate or polyamide film, the bonding layer is a modified polyurethane adhesive, the treatment layer is a nano-pore forming layer, the aluminum foil layer is an alloy aluminum foil, the special protective layer is a dense film protective layer, and the multifunctional inner layer is a polypropylene or polyethylene film. The structure of the treatment layer can improve the bonding effect between the outer surface and the intermediate layer of the aluminum-plastic composite film, greatly enhances the ductility of thealuminum-plastic composite film and improves the delamination phenomenon of the surface layer. The structure combination of the special protective layer and the multifunctional inner layer can improve the bonding effect of a heat sealing layer and an insulating layer, and the insulating layer has strong chemical resistance.
Owner:CHANGZHOU SVECK PHOTOVOLTAIC NEW MATERIAL

LDMOS device and manufacturing method thereof

The invention discloses an LDMOS device and a manufacturing method thereof, and relates to the field of semiconductor manufacturing. The LDMOS device comprises a substrate, and a first type deep trap,a first type well region and a second type well region which are arranged in the substrate, wherein the first type well region is located between the first type deep well and the second type well region, a first type heavily doped region is arranged at one end of the first type deep trap, a gate structure is arranged on the surface of the substrate, the first type well region is located below thegate structure, the gate structure is separated from the first type heavily doped region in the first type deep well through field oxygen, one end of the gate structure extends to the field oxygen surface above the first deep well, the other end of the gate structure is positioned above the second type well region, and a first type heavily doped region and a second type heavily doped region are arranged in the second type well region. According to the invention, the problem that an IDVD curve of an existing middle-high voltage LDMOS device has a quasi-saturation phenomenon is solved, and theeffect of improving the performance of the medium-high voltage LDMOS device is achieved.
Owner:SHANGHAI HUAHONG GRACE SEMICON MFG CORP

Water suction windlass device

ActiveCN104754872AImprove the phenomenon of the posterior bandImprove the phenomenonConductive pattern polishing/cleaningEngineeringExtrusion
The invention relates to the technical field of water washing equipment for circuit boards and discloses a water suction windlass device used for extruding, sucking and etching liquid on the circuit board. The water suction windlass device comprises an isolation groove, a stand firmly arranged in the isolation groove, a water suction windlass group arranged on the stand and used for extruding and sucking the liquid on the circuit board, and a transmission device arranged on the stand and used for driving the water suction windlass group to rotate axially, and moreover, the stand is provided with a water press windlass for extruding the water suction windlass group, an angle is formed between the water press windlass and the water suction windlass group, and spiral water extrusion threads are formed in the outer wall of the water press windlass. According to the water suction windlass device, the water press windlass with water extrusion threads is arranged at the oblique upper side of the water suction windlass group, the water suction windlass group is extruded through the water press windlass, the liquid sucked by the water suction windlass group is extruded towards the two ends through the water extrusion threads, the post-liquid taking phenomenon is reduced, the energy saving and emission reduction demands are satisfied, the circuit board surface oxidization chance is reduced, and the circuit board quality is improved.
Owner:UNIVERSAL P C B EQUIP SHENZHEN
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