200results about How to "Improve running characteristics" patented technology

The structure of the system includes three parts: the control part, the detection part and the drive part. The control part consists of three parts: the main controller i.e. the operation controller,the distance change control and the speed change controller. The detection part includes the wind wheel rotor, the stator of double fed generator, the variable frequency power supply of speed drop excitation and the invention power source of pulse-width modulation etc. assembled sensors. The drive part is composed of the servomotors with different functions. The sensed signals are output from thedetection part. The control signals output from the interlinkage drive module controls harmonious operation. The invention provides the features of simple structure, stable and reliable running and flexible control.

A suspension device has in- and out-configurations for use with a vehicle, including means for damping and/or spring action, the damping and/or spring action being controllable, wherein the controllability of the damping and/or spring action includes a locked or substantially locked state in the out-configuration. A method of using the suspension device with a vehicle is also provided.

The invention discloses a method for outputting active power by using a smoothing permanent-magnet direct-driving wind power generating system of a direct-current-side flywheel energy storage unit. The method comprises the following steps of: controlling a motor-side converter; controlling a grid-side converter; and controlling an energy-storage-unit-side converter. By cooperated control of the motor-side converter, the grid-side converter and the energy-storage-unit-side converter, a wind power generator set can generate relatively-smoothed active output in the situation of change of a wind speed, and operating requirements of frequency modulation and voltage regulation of the system are met. The method has the advantages that: 1, based on the requirement of power smoothing control, maximum wind energy tracking control is realized; and 2, the network-side active power is smoothed, the quality of electric energy is improved, and the grid-connected operating characteristic of the wind power generating system is improved.

A hinge assembly rotationally connecting two components includes at least a shaft coupled to one of the components and a tubular member connected to the other component and a defining an annular space around said shaft. A viscous damping fluid is disposed in said space and provides a damping force resisting relative rotation between the two components. A second tubular member is also provided that is connected to the shaft and is arranged axially around the first tubular member. In this latter configuration, static and dynamic frictional forces are generated between the tubular members that resist rotation between the components as well.

The present invention relates to a probe for making electrical connection to a contact pad on a microelectronic device. A foot having a length, a thickness, a width, a proximal end, and a distal end, is connected to a substrate. The length of the foot is greater than its width. A torsion bar having a length, a width, a thickness, a proximal end, and a distal end, is connected to the distal end of the foot at the proximal end of torsion bar. The torsion bar lies in a first plane. A spacer having a length, a width, and a thickness, is connected to the distal end of the torsion bar. An arm having a length, a width, a thickness, a proximal end, and a distal end is connected to said spacer at the arms proximal end. The arm lies in a second plane and the second plane is in a different plane than the first plane. A first post having a top side and a bottom side is connected to the arm near the distal end of the arm. A tip is electrically connected to the top side of the post.

The invention relates to a control system and a control method for a three-phase four-bridge-arm permanent magnet synchronous motor. When a conventional three-phase three-bridge-arm main circuit topological structure is short of phase or has a single-phase broken fault, the safe and reliable running of a system is difficult to maintain, and the occasions with strict requirements on redundancy and reliability of a control system in aviation, navigation, explosion protection and the like are limited. The control system structurally comprises a main circuit, wherein the 220V single-phase alternating-current input (1) of the main circuit is connected with a single-phase rectification circuit (2); the single-phase rectification circuit is connected with a four-bridge-arm inverter (3); the four-bridge-arm inverter is connected with the permanent magnet synchronous motor (8) through a bridge arm A (4), a bridge arm B (5), a bridge arm C (6) and a bridge arm D (7); the bridge arm A, the bridge arm B and the bridge arm C are connected with a current sampling circuit (10); and the permanent magnet synchronous motor is connected with a photoelectric coded disc (11). The control system and the control method are used for controlling the three-phase four-bridge-arm permanent magnet synchronous motor.

A variable capacitance element includes a movable element provided above a substrate using supporting portions and support beams so as to be displaced from the substrate. An insulating film and a movable electrode are provided on a conductor facing surface of the movable element. A driving electrode is arranged to displace the movable element, between a signal cutoff position and a signal passage position, whereby a high frequency signal transmitted through a transmission line is cut off or allowed to pass. The insulating film uses compressive stress to warp the movable element and the movable electrode in a direction of warping in a convex form toward the transmission line, and maintains this warping direction.

A compression-release brake system for operating an exhaust valve of an engine during an engine braking operation. The compression-release brake system comprises a self-contained compression brake control module (CBCM) operatively coupled to the exhaust valve for controlling a lift and a phase angle thereof and a source of a pressurized hydraulic fluid. The CBCM includes a casing defining piston and actuator cavities, a slave piston mounted within the piston cavity, a check valve provided between a supply conduit and a slave piston chamber and a compression brake actuator disposed in the actuator cavity. The compression brake actuator includes an actuator element and a biasing spring. The actuator element selectively engages the check valve when deactivated so as to unlock the slave piston chamber, and disengages from the check valve when activated so as to lock the slave piston chamber. The actuator element is exposed to atmospheric pressure.

The invention relates to a method for melt-spinning, drawing, and winding a multifilament thread to form a fully-drawn yarn and to a device for performing the method. First, a plurality of filaments are extruded from a thermoplastic melt, cooled to a temperature below the glass transition temperature of the thermoplastic material, and joined to form a filament bundle by supplying a preparation oil having a water content of at most 8%. Then, the filament bundle is removed by a simple partial wrapping on optionally heated guiding jackets of several driven galettes at a speed above 1,200 m/min. For drawing and subsequent relaxation, the filament bundle is guided at a drawing speed above 3,500 m/min by a simple partial wrapping on the circumference of further heated guiding jackets of driven galettes. For this purpose, the device according to the invention comprises two galette groups having several driven galettes, wherein the first galette group guides the filament bundle in order to remove and/or heat the filament bundle by simple partial wrapping and the second galette group guides the filament bundle in order to draw the filament bundle by simple partial wrapping.

The invention relates to a preparation method for a glass fibre reinforced resin composite plate spring. The method comprises the following steps of: respectively soaking a glass fibre cloth and a glass fibre filament in epoxy resin, laying a layer on the upper and lower surfaces of a core model by using the glass fibre cloth; in the case of existing a preset value of the appropriate tensile force, winding the glass fibre filament on the core module, wherein the applied tensile force to the glass fibre filament gradually decreases along with the number of winding layers in the winding process; laying a layer of glass fibre cloth after the completion of winding; performing die assembly by the conventional manner to obtain an incompleted plate spring in embryo, and solidifying to obtain the glass fibre reinforced resin composite plate spring. The plate spring product prepared by the method provided by the invention has more excellent strength, is stronger in fatigue resistance than steel materials and is above 60% lighter in weight than the steel plate spring.

A full-digital fine-step high-accuracy controller for step motor is composed of single-chip microprocessor as control core, step motor control interface, power amplifier, and serial communication interface to host computer. Its control signal has standard TTL levels. Its highest frequency (1MH2) can be divided by 250, so increasing its control accuracy by 250 times.

The invention discloses an automobile plate spring of three-dimensional braided composite material and a preparation method thereof. The plate spring is of a three-dimensional fabric structure which is formed by combining and waving hybrid fibers, the material of fibers, the amount of tows and the structure of the fabric are adjusted to make the important part of the plate spring higher in strength and fatigue rigidity and longer in use durability, and simultaneously a resin vacuum transfer moulding technology is cooperated to uniformly soak, cure and shape the special composite resin, so as to obtain the heavy truck plate spring of three-dimensional braided composite material, the heavy truck plate spring is light in weight, strong in fatigue resistance, high in strength, rigidity and dimensional stability and relatively long in service life, and the problems of the common plate spring of two-dimensional laminated structure composite material such as interlayer fracture under fatigue loading condition are conquered.

The invention belongs to the technical field of the electric power system and the wind power field grid-connection, in particular to an integration protection method capable of reducing the wind power field low-voltage crossing capacity, comprising the following steps: using a current protection criterion to realize the identification of a fault line, measuring a phase voltage U Phi of a bus lineof a wind power field grid-connection transformer station for a voltage protection criterion, calculating the voltage sag amplitude value percent value V lower than low-voltage crossing stable value(90% rated voltage value); if the V value is larger than or equal to 70, the II section current protection delay is canceled by the voltage protection criterion; if the V value is smaller than 70, the current protection delay on the fault line is adjusted at the real time by the voltage protection criterion, thus the relationship between the failure cut time formed by the current protection delay time and the line breaker action intrinsic time and the V value is as follow: (V2+1707)*t=5081, wherein 0.6<=t<=4. The wind power field low-voltage crossing capacity is increased on the system level, the implementation is simple and the cost is low; simultaneously the safety operation of the wind electric machine set and the electric power system is protected.

The invention provides an intelligent monitoring terminal of an electric distribution system. The intelligent monitoring terminal of the electric distribution system comprises a monolithic system circuit, a temperature signal acquisition circuit, a leakage protection detection circuit, a switching signal detection port circuit, an integrated electrical parameter detecting unit circuit, a harmonic wave detecting and analyzing unit circuit, a control signal outputting port circuit, a data communication interface circuit, a transmitting and receiving communication module circuit, a voltage signal acquisition circuit, a current signal acquisition circuit, a harmonic wave signal acquisition circuit connected with the harmonic wave detecting and analyzing unit circuit, an auxiliary working power supply circuit, a standby battery charging source circuit, a power substation computer connected with a two-way communication module, a mobile phone for an electricity manager and a mobile communication base station, wherein the temperature signal acquisition circuit, the leakage protection detection circuit, the switching signal detection port circuit, the integrated electrical parameter detecting unit circuit, the harmonic wave detecting and analyzing unit circuit, the control signal outputting port circuit, the data communication interface circuit and the transmitting and receiving communication module circuit are respectively connected with the monolithic system circuit; the voltage signal acquisition circuit and the current signal acquisition circuit are respectively connected with the integrated electrical parameter detecting unit circuit; and the auxiliary working power supply circuit and the standby battery charging source circuit provide power for the terminal. The invention has the advantages of economical efficiency, practicability, convenient application, ideal operating characteristics and suitability for national condition development of China.

A cup holder unit includes a housing case; a rest tray that switches between a pulled out position where it is moved forward from the case and a stored position where it is pushed in the case; and a holder member switchable from a non-usable position where it is superposed above the tray and stored in the case to a usable position where it is raised by a forward movement of the tray. The cup holder unit has shafts projecting from the holder member to be spaced apart from each other; clearance slots disposed in upright walls of the tray; and guide grooves disposed in the case and slanted upwardly toward front to slidably receive the shafts therein via the clearance slots. Each clearance slot includes a vertical slot and an arc-shaped slot turning toward a rear side from an upper section of the vertical slot.

A semiconductor memory input/output device includes selection pads used to input and output signals for multiple operation modes and having multiple functions, a control signal generator for outputting setting signals and a mask control signal, a lower input/output unit including a lower output buffer for outputting a read data strobe signal to a selection pad and a lower input buffer for receiving a lower data mask signal from the selection pad, and selecting one operation of the lower output buffer and the lower input buffer, and an upper input/output unit including an upper output buffer for outputting an inverted read data strobe signal to the second selection pad and an upper input buffer for receiving an upper data mask signal from the second selection pad, and selecting one operation of the upper output buffer and the upper input buffer.

The invention provides a terahertz-wave parametric oscillator based on a cube-corner prism resonant cavity, which is characterized in that the resonant cavity is formed by a right-angle trihedral cube-corner prism and an output mirror; the right-angle trihedral cube-corner prism can rotate around a cavity axis of the resonant cavity; the resonant cavity is internally provided with a MgO: LiNbO3 crystal; a silicon prism array is put on the surface of the MgO: LiNbO3 crystal; and a polarizer is arranged between the right-angle trihedral cube-corner prism and the MgO: LiNbO3 crystal according to a Brewster angle; pumplight is incident to the resonant cavity to simulate the MgO: LiNbO3 crystal to generate terahertz-wave which is sent out by the silicon prism array. Frequency tuning output of terahertz-wave is realized by rotating the output mirror without needing integrally rotating the resonant cavity. The oscillator is a continuously tunable full-solid state terahertz-wave coherent radiation source with small volume, compact structure, and high working stability and can be widely applied to terahertz-wave photoelectronic technique fields such as medical diagnosis, fine spectral analysis, biomedical Imaging, terahertz-wave communication, etc.

The invention discloses a method for improving the stability of a doubly-indeed DC system in the technical field of monitoring and control of high-voltage DC transmission lines. The method comprises the following steps of: additionally arranging a static synchronous compensator subsystem in the doubly-indeed DC system, connecting the static synchronous compensator subsystem and a line-commutated-converter high-voltage DC subsystem of any one of two line-commutated-converter high-voltage DC subsystems to the same AC busbar in parallel and then connecting AC busbars of the two line-commutated-converter high-voltage DC subsystems by using impedance equivalent to a set electric distance. According to the method disclosed by the invention, the static synchronous compensator subsystem is accessed to the AC busbar of one DC subsystem inverter station of the doubly-indeed DC system with different points of fall, and the operation characteristics of the doubly-indeed DC system with different points of fall is effectively improved.