307results about How to "Improve control characteristics" patented technology

Ultrasonic horns configured for use with a surgical ultrasonic handpiece including a resonator are described. The ultrasonic horns include an elongated member having a longitudinal internal channel extending partially therethrough. Disposed on the distal end of the elongated member is a chisel and awl shaped tip configured for cutting and/or abrading hard tissue, for example bone.

A three-dimensional semiconductor device, comprising a plurality of memory cell transistors and a plurality of select transistors at least partially overlapped in the vertical direction, wherein each select transistor comprises a first drain, an active region and a common source formed in the substrate, distributed along the vertical direction, as well as a metal gate distributed around the active region; wherein each memory cell transistor comprises a channel layer distributed perpendicularly to the substrate surface, a plurality of inter-layer insulating layers and a plurality of gate stack structures alternately stacked along the sidewalls of said channel layer, a second drain located on top of said channel layer; wherein said channel layer and said the first drain are electrically connected. In accordance with the three-dimensional semiconductor memory device and manufacturing method of the present invention, the multi-gate MOSFET is formed beneath the stack structure of the memory cell string including vertical channel to serve as the select transistor, this can improve the control characteristics of the gate threshold voltage, reduce the off-state leakage current, prevent the substrate from over-etching, and effectively improve the reliability of the device.

This invention is a remote control device to control a thermostat. The remote control works using RF transceivers in base a wall mounted base unit and a portable remote control unit, or optionally, using infrared signals much like a television remote control. The remote control has a keypad on it to allow one to select the desired temperature, or to select a temperature from one of several buttons on it corresponding to a specific temperature. This enables the user to set the temperature of a room without having to get up and manually change it.

The present invention provides an improved control methodology for maximum power point tracking (MPPT), anti-islanding, and output current regulation for distributed generation sources connected to a utility grid. The control includes enhancements for MPPT and regulating the inverter output-current that is sourced into the utility grid. In addition, the functions associated with MPPT, anti-islanding detection and output current regulation are integrated together; the MPPT algorithm operates in conjunction with the anti-islanding detection, and the output current regulation operates in conjunction with the MPPT algorithm.

The invention discloses an extrusion foaming thermoplastic polyurethane elastomer bead. The extrusion foaming thermoplastic polyurethane elastomer bead comprises the following components in parts by weight: 100 parts of thermoplastic polyurethane elastomer, 0.01-0.5 parts of a foaming nucleating agent, and 0.01-0.2 parts of an antioxidant, wherein a foaming process adopts supercritical fluid with the addition amount of 1-40 parts. The invention also discloses a preparation method of the extrusion foaming thermoplastic polyurethane elastomer bead. The extrusion foaming thermoplastic polyurethane elastomer bead and the preparation method have the advantages that the foaming process does not cause environmental pollution; the obtained foaming material is stable in quality and high in foaming ratio; and the operation method in production is easy and suitable for continuous industrial production.

The invention discloses a control system for measuring the energy consumption of urban rail transit and an evaluation method. The control system comprises a vehicle-mounted energy consumption control unit, a data management unit and a ground energy consumption control unit. The control system has the beneficial effects that the system is a multi-path sampling energyconsumption metering system; drive control is carried out by adopting a permanent-magnet synchronous DC motor; a double-energy control module is built by using a super capacitor and a lithium battery for vehicle-mounted energy conversion control; train force analysis and modeling are not needed; a large quantity of nonlinear analysis or intelligent optimization calculation is not needed; traction energy consumption, regenerative braking energy and auxiliary energy consumption can be measured and monitored by directly utilizing collected voltage and current data; the control system has the functions of real-time storage and display of energy consumption data; the energy consumption data can be uploaded to the ground energy consumption control unit through the data management unit; the labor cost is reduced; the control system has a fault detection function; and the fault can be accurately reported when the system fails.

A pneumatic pressure regulating valve, the opening of which can be automatically changed in a pressure-related manner, including a control diaphragm that is subjected to a reference pressure, to the gas pressure as well as to a governor spring, wherein a change in the differential pressure causes an adjustment of the control diaphragm and the latter itself or a closing element actuated by it changes the opening through an outflow cross-section, and wherein a structure that is arranged adjacent to the outflow cross-section on the diaphragm side forms a stop for the control diaphragm or for the closing element in the closed position of said control diaphragm. At least one preliminary stop is arranged in the pressure regulating valve such that, when the control diaphragm is moving in its closing direction, the control diaphragm or the closing element first comes into contact with the preliminary stop and that, when the control diaphragm is moving further in its closing direction, the control diaphragm or the closing element will then, while being subjected to elastic and flexible deformation or being further subjected to elastic and flexible deformation respectively, further reduces the opening and, in a final position, also comes into contact with the stop.

The present invention is a bicycle including a bicycle frame and a rear wheel suspension system that is attached to the frame. The rear wheel suspension system includes a rear wheel swingarm and a shock absorber that is engaged to the swingarm to control the motion of a rear wheel of the bicycle. A change in the vertical wheel travel (ΔVWT) of the rear wheel is related to a change in the length of the shock absorber (ΔSL), providing a shock rate (SR) according to the relationship:

The shock rate (SR) changes throughout the vertical wheel travel of the rear wheel, such that the change in the shock rate dSR/dVWT has a change in sign as the rear wheel travels through its vertical wheel travel. The shock rate may at first decrease in value and subsequently increase, or initially increase in value and subsequently decrease throughout the vertical wheel travel of the rear wheel. In various exemplary embodiments the swingarm may be attached to the frame at a single pivot point or through a linkage system.

Ultrasonic horns configured for use with a surgical ultrasonic handpiece including a resonator are described. The ultrasonic horns include an elongated member having a longitudinal internal channel extending therethrough. Disposed on the distal end of the elongated member is a tip lead configured for cutting and/or abrading hard tissue, for example bone. The tip lead includes an abrasive surface.

There is provided a method by which lightly doped drain (LDD) regions can be formed easily and at good yields in source/drain regions in thin film transistors possessing gate electrodes covered with an oxide covering. A lightly doped drain (LDD) region is formed by introducing an impurity into an island-shaped silicon film in a self-aligning manner, with a gate electrode serving as a mask. First, low-concentration impurity regions are formed in the island-shaped silicon film by using rotation-tilt ion implantation to effect ion doping from an oblique direction relative to the substrate. Low-concentration impurity regions are also formed below the gate electrode at this time. After that, an impurity at a high concentration is introduced normally to the substrate, so forming high-concentration impurity regions. In the above process, a low-concentration impurity region remains below the gate electrode and constitutes a lightly doped drain region.

The technology disclosed relates to a controller and a control method for a motorised vehicle, and in particular to the control of a motorised vehicle having at least a left wheel and a right wheel, the left wheel being driven by a left motor and the right wheel being driven by a right motor. In accordance with such motorised vehicles, linear motion of the vehicle is typically effected by driving the left motor and the right motor in the same direction, whilst spinning of the vehicle is typically effected by driving the left motor and the right motor in opposite directions. A typical example of such a motorised vehicle is an electric wheelchair.

The invention discloses a pulled multicellular configuration and an energy-absorbing structure component, comprising a plurality of unit cell structures, wherein each unit cell is obtained by cleverlysplicing two typical concave characteristic structures and two arrow-shaped structures; the pulled multicellular configuration and the energy-absorbing structure component comprise a plurality of unit cell structures. The vertices of the concave corners on the left and right sides of the concave eigenstructure are connected with two arrow-shaped eigenstructures respectively, and the vertices of the concave corners of the two arrow-shaped eigenstructures are connected with half of the transverse bars of the other two concave eigenstructures, which together form a single cell structure with anexpanded multicellular configuration; the vertices of the concave corners of the left and right sides of the concave eigenstructures are connected with each other. Then the two-dimensional stretched polycyclic configuration is obtained by planar array. The polycellular material has negative Poisson's ratio property, which shrinks when compressed, thus locally densifying the compressed region. Thisunique deformation characteristic makes the polycellular material have stronger indentation resistance and impact resistance. In addition, by changing the slenderness ratio and inclination angle of the rod, the elastic properties and compression strength of the rod are adjusted.

A constant velocity fixed ball joint in the form of a counter-track joint comprising an outer joint part with outer tracks, an inner joint part with inner tracks, torque-transmitting balls accommodated in pairs of tracks, and a ball cage with cage windows in which the balls are held in a common plane. First outer tracks and first inner tracks form first pairs of tracks which diverge from one another running in a first axial direction towards the connection end of the inner joint part and hold first balls. Second outer tracks and second inner tracks form second pairs of tracks which diverge from one another running in a second axial direction towards the connection end of the outer joint part and hold second balls. First pairs of tracks are positioned radially opposite other first pairs of tracks, and second pairs of tracks are positioned radially opposite other second pairs of tracks.

The utility model discloses a moving coil permanent magnet linear motor having high power density. The utility model comprises a coil assembly, a coil assembly frame, an inner magnetic yoke, a permanent magnet, an outer magnetic yoke and other components; the coil assembly comprises a forward winding and a reverse winding; the coil assembly is fixed on the coil assembly frame, and is capable of making reciprocating linear motion in an air gap; the coil assembly frame is connected with the driven moving elements; the direction and the size of the current is regulated through an electric control system, and then the needed motion mode is realized. The permanent magnet group is arranged at one side or both sides of the coil assembly; the permanent magnet group alternately adopts permanent magnets with different magnetic directions along motion direction and forms a Halbach array. The utility model has the advantages that, the power density of the motor is improved obviously, which is 50% more than the power density of conventional linear motors; meanwhile, the utility model has better control characteristic. The utility model can be used as an executive element and applied to the situations where the volume and the mass of the linear motor need to be small, and the thrust and the accuracy of the linear motor need to be large; for example, the utility model can be applied to the electro-hydraulic proportional control field, the robot field or other fields.

The related control system for crystal equal-diameter growth comprises: a crystal growing furnace, a crystal diameter detection part, a control part for crucible temperature, a control part for crystal tension speed to real-time gather crystal tension speed signal and feedback to regulate the speed by algorithm of Fuzzy control and PID control, and a common controller to receive all former signal. this invention improves control precision greatly as well as the one-draw yield.

The present invention provides a play extension system enhancing a fun of a toy system by use of network. The play extension system is used by combination with the toy system in which a user can change the setting of parameters affecting motion control of a driving machine, for extending a playing method with the toy system. In the system, the setting information corresponding to the setting state of the parameters is received from a predetermined user terminal through a network, and estimation on the obtained setting information is created by referring to a database which stores the setting information and the information for estimating the setting state correspondingly. The created estimation is transmitted to a predetermined destination through the network.

It is attained by being provided with a motor constant calculation unit for calculating electric constants of a motor, and by correcting setting values of electric constants defined on one of the axes of two orthogonal axes, by a functional expression using a state variable defined on the same axis, and by correcting them by a functional expression using a state variable defined on the other axis.

The invention relates to a low voltage low frequency transducer that is used to drive mine winder high voltage winding asynchronous motor. It comprises rectification circuit, inverter circuit, and frequency transducer control unit. The control system of the invention is in the transducer and the output voltage is especial PWM low DC voltage and low voltage low frequency PWM AC. It adopts discontinuity switching operation mode and only connects to the high voltage winding asynchronous motor to drive the motor directly by high voltage switch when the motor is in retarding braking stage and retarding crawling stage. The invention has the advantage of great DC dynamic brake moment and low frequency crawling dynamic moment, as well as low cost.

The invention relates to an optimization and adjustment testing method for load control of a generator set boiler. The method comprises the steps that (1), a boiler requirement command is processed through a leading/lagging function module; (2), a high selector module selects outputting; (3), a deviation calculation module calculates deviation; (4), the deviation calculation module outputs a deviation value to a main PID control module; (5), function f(x) linear processing and transforming are carried out on an actual load command of a set; (6), derivative control module operation and high and low amplitude limiting processing are carried out on the actual load command of the set; (7), superposition and summation are carried out; (8), the deviation value is input into a feedforward input channel of the main PID control module, and feedforward operation is carried out on the deviation value; (9), the deviation calculation module works out deviation; (10), an integral operation module carries out calculation; (11), the integral operation result is output as a master control command of the boiler. According to the method, the non-linear characteristic of the boiler in the load varying process of the generator set is effectively compensated for, the large-time-delay and great-inertia characteristic of the boiler is restrained, the control characteristic of the boiler is improved, the fluctuation range of the main steam pressure of the boiler is reduced, and the ability, to respond to the load change of a turbonator, of the boiler is improved.