99results about How to "Improved speed stability" patented technology

The invention discloses a 3D (Three-Dimensional) printer based on rotation and continuous extrusion of a threaded rod. The 3D printer comprises a shell, an extruding mechanism, a lifting mechanism, a working platform and sliding rails, wherein the working platform is mounted at the lower part inside the shell through the sliding rails; the extruding mechanism is mounted inside the shell through the lifting mechanism, and is positioned above the working platform; the extruding mechanism comprises a machine barrel, a motor, a feed hopper and at least one threaded rod, the machine barrel comprises a conveying part, a transition part and an extrusion part, and the conveying part, the transition part and the extrusion part are connected in sequence from the material moving direction; the conveying part and the motor are both mounted at the lifting mechanism; the threaded rod is mounted at the inner cavity of the conveying part, and one end of the threaded rod is connected with a rotating shaft of the motor; the feed hopper is mounted on the conveying part. The 3D printer is good in stability and good in continuity, and different types of printing materials can be used; meanwhile, an additive can be added to the printing material during printing, so that the printing material is improved.

A longitudinal control law is designed to optimize the flying qualities when aircraft is set to approach configuration, i.e. when the flap lever is set to the landing position and landing gears are locked down. Under such circumstances, the effort of trimming the aircraft speed can be extremely reduced by the usage of a momentary on-off switch or other control in the sidestick, instead of or in addition to a conventional trim up-down switch, making easier the task of airspeed selection by the pilot. This control law provides excellent handling qualities during approach and landing, with the benefit of not needing or using radio altimeter information in safety-critical applications.

The invention relates to a high-reliability high-stability-degree hollow rotating traveling wave ultrasonic motor, which belongs to the technical field of the small and special motor. The ultrasonic motor comprises an encloser, a rotor, friction material, a stator, piezoelectric ceramic, a stator seat, a bearing, a dust cover for the bearing, and a loading nut. The motor disclosed by the invention is supported by one bearing, an anti-redundancy structure is designed, and the motor rotor and the stator seat are made of stainless steel material with the coefficient of linear expansion similar to that of the bearing. The situations that the revolving speed fluctuation quantity of the ultrasonic motor is raised, and the moment output performance is lowered, and the service life of the ultrasonic motor is shortened due to a plurality of factors can be effectively improved, wherein the factors comprise that the pressure distribution of the contact interface of the stator and the rotor is uneven due to double-end bearing supporting, more mutually-cooperated sizes and big deviation of machining and assembling of the ultrasonic motor; abrasive dust generated by motor working enters the bearing; the coefficients of linear expansion of materials are in a great difference under the high temperature and low temperature working conditions; and a fit clearance is changed.

Duty information of PWM signals output of the duty correcting portion 19 is applied to the current detector 11 which is provided on an inverter busbar. Thus, the current detector determines which phase current of the three phases is appearing on the inverter busbar with reference to the duty information while detecting an inverter busbar current. The detected phase current is then used in the estimate calculation of the induced voltage.

The invention discloses a speed regulating method of an electric vehicle in a speed control mode and a motor controller thereof. The speed regulating method comprises the following steps: the currentrotational speed of an electric motor in the electric vehicle is made to be different from a target rotational speed; the difference between the current rotational speed and the target rotational speed is adjusted by a PI regulator to obtain a regulating current; Assigning a value of the adjusting current to a torque command required when searching a 2D table corresponding to the motor; Calculating a mapping coefficient between the motor current and the motor torque in the form of a standard 1 value according to a preset current torque relation, and updating a lookup table step size of the 2Dtable according to the mapping coefficient; According to the current rotational speed and torque command of the motor, detecting a given direct-axis current component and a given quadrature-axis current component of the motor from the updated 2D table; According to the given direct-axis current component and the given quadrature-axis current component, the current output of the motor is controlledby the preset vector control algorithm. As can be seen, the present application accelerates the speed regulation speed; And the speed stability of the electric vehicle is improved, so that the speedand the ride comfort of the electric vehicle are improved when the electric vehicle is shifted.

A trigger valve controlling device for a pneumatic nail gun includes a main air passageway, a valve sleeve and a main air valve opening. The valve sleeve separates the main air passageway into a front passageway, a middle chamber and a rear passageway. After hitting nails, a high pressure air in the trigger valve controlling device is capable of driving a hitting bar of the pneumatic nail gun to move upward to reset.

A method for inexpensively and easily manufacturing a polishing pad of excellent durability and polishing speed stability includes preparing a cell dispersed urethane composition by mechanical foaming, applying the cell dispersed urethane composition onto a base material layer, forming a polyurethane foamed layer having roughly spherical interconnected cells by curing the cell dispersed urethane composition, and regulating the thickness of the polyurethane foamed layer uniformly.

The invention provides a demountable tanker truck and a hydraulic system thereof. The hydraulic system comprises a hydraulic pump, wherein the hydraulic pump supplies oil to a main oil cylinder and a moving oil cylinder through a multi-way valve, the multi-way valve at least comprises a main oil cylinder reversing valve and a moving oil cylinder reversing valve, and the hydraulic system also comprises a first position detection device and/or a second position detection device. The moving state of the main oil cylinder can be controlled according to the first position detection device, and the moving state of the moving oil cylinder can be controlled according to the second position detection device. The synchronism of the operation process of the main oil cylinder can also be ensured, and in addition, the protection on a main oil path can also be realized. The demountable tanker truck and the hydraulic system thereof have the advantages that misoperation can be reduced, the synchronism is high, the anti-impact performance is good, and the like.

The invention discloses an intelligent electric-driven and pneumatic-type wide seedling strip wheat precision and uniformity seed-metering device. The device comprises a pneumatic multi-row precisionseed meter arranged on a bearing frame, a row seeding conversion manifold block, a wide seedling strip row ditcher and an intelligent collection control circuit part, wherein a seed transport interface is arranged at the upper end of the pneumatic multi-row precision seed meter; the pneumatic multi-row precision seed meter comprises a multi-circle combined discharge plate driven by a servo motor;a seed cleaning knife mechanism is arranged on the multi-circle combined discharge plate; the row seeding conversion manifold block is connected to the lower part of an outlet of the multi-circle combined discharge plate; the wide seedling strip row ditcher is connected to the lower end of the row seeding conversion manifold block; the intelligent collection control circuit part comprises a speedcollection sensor; the speed collection sensor is arranged on a land wheel shaft of a matched machine, collects a land wheel speed and transmits a signal to a touch terminal; an advance speed of a seeding machine is calculated; and the discharge plate outputs a control signal of driving the servo motor to drive the servo motor, thereby matching a rotating speed of the discharge plate with the advance speed of the machine and achieving the stability and consistency of per mu seeding rate and a set value.

An anti-resonance control system used for a power lithium battery preparation device and a method thereof are disclosed. The system comprises a servo controller, a servo driver, a servo motor, a feedforward mechanism and a biquadratic filter. The servo controller is a three-closed-loop PID servo controller formed by a position loop, a speed loop and a current loop. The servo controller is connected to the servo driver and is used for sending an instruction to the servo driver. The servo driver is connected to the servo motor and is used for controlling operation of the servo motor. The feedforward mechanism comprises speed feedforward arranged at an input terminal of the speed loop and acceleration feedforward arranged at an input terminal of the current loop. The biquadratic filter is connected to the speed loop and is used for carrying out biquadratic filtering on an output signal of the speed loop. The current loop outputs a voltage control signal. The servo controller receives the voltage control signal and then drives the servo motor to rotate. Dynamic performance of system tracking response is increased and stability and reliability of system operation are improved.

The invention provides an asynchronous starting permanent magnet auxiliary synchronous reluctance motor. The permanent magnet auxiliary synchronous reluctance motor comprises a stator assembly and a rotor assembly which are coaxially arranged, the rotor assembly comprises a cylindrical rotor core, a first end cover and a second end cover, a plurality of first magnetic isolation grooves which are parallel to one another and penetrate through the rotor core in the axial direction are formed in the rotor core, magnetic steel serving as a permanent magnet is installed in each first magnetic isolation groove, and a plurality of second magnetic isolation grooves which penetrate through the rotor core in the axial direction are formed in the area close to the outer edge of the rotor core, a second magnetic isolation groove is arranged between two ends of each first magnetic isolation groove and the outer edge of the rotor core, a first non-magnetic conductive strip is arranged in each secondmagnetic isolation groove, the first end cover and the second end cover are respectively fixed at two ends of the rotor core along the axial direction, and the motor shaft is arranged on the first endcover and the second end cover.

The invention discloses multi-group color separation spinning and crocheting wool yarn and a manufacturing method of the multi-group color separation spinning and crocheting wool yarn. The manufacturing method comprises the steps that elastic nylon or filaments are crocheted to be net-shaped yarn, drafted multi-group color separation spinning short fiber thick yarn wool tops are fed and enter false twisting hooks of hook wood ingots under the traction of the nylon filaments or the elastic filaments, 10-20 false twists are added on strands and the nylon filaments or the elastic filaments to form thick yarn to be attached to the net-shaped yarn of the nylon filaments or the elastic filaments, and the multi-group color separation spinning and crocheting wool yarn is obtained after untwisting. As the tape yarn is of a drafting type, the yarn has the advantages of being soft, fluffy, high in strength and the like, wool does not fall off easily, the yarn is applicable to sweater yarn of autumn and winter clothes, and good moisture absorption performance, the heat retention performance and the air permeability are achieved. The manufacturing method overcomes the defect that a traditional twisting machine is single in fiber mode, enriches the characteristics of multiple components of the yarn, subsequent dyeing is avoided, and the yarn is an environmentally friendly product.

The present invention is double rotor column traveling wave type monophase driving ultrasonic motor, and belongs to the field of miniature motor. The ultrasonic motor consists of mainly metal column, piezoelectric ceramic chip, rotors, output shaft, butterfly spring and pressing nut. The piezoelectric ceramic chip is adhered to the flat surface in the middle part of the metal column. The output shaft has one end in semi-spherical structure pressed directly onto the inner conic surface of the metal column while the butterfly spring presses the other semi-spherical rotor onto the other inner conic surface of the metal column. The pre-pressure between the stator and the rotor is obtained via regulating the pressing nut to change the deformation of the butterfly spring. When AC voltage is applied, the points on two ends of the metal column generate elliptic motion and friction force is generated between the stator and the rotor to rotate the rotor, with the motion being output via the shaft.

The gasoline engine with two horizontally and oppositely set cylinders includes upper and lower engine bodies, cylinders, spark plug, piston assembly, piston ring, crankshaft link assembly, leaf valve assembly and carburetor. The crankshaft link assembly is set inside the crankshaft box comprising the upper and the lower engine bodies, the right and the left cylinders are set horizontally on two sides of the crankshaft box and are provided with separated exhaust pipes, the piston assembly is connected to the crankshaft link assembly and set inside the right and the left cylinders, and the carburetor is fixed on the crankshaft box via the leaf valve and has fixed gas intake seat. With the said structure, the gasoline engine of cylinder diameter of 33 mm has displacement of 48 cc, maximum power up to 3.1 kw in 8500 rpm rotation speed and rotation speed stability within 1 %.

A truck and a skateboard assembly comprised of two trucks and a deck. The truck of the present invention has three rigid bodies and two degrees of freedom. The three rigid bodies comprise: (1) the deck and baseplate assembly for the skateboard assembly, or the baseplate assembly for the truck; (2) the hanger assembly; and (3) the floating kingpin assembly. The three rigid bodies are joined together by three spherical joints and elastomerically coupled and constrained by elastomeric components. The truck of the present invention provides the combined functionality of deep deck lean, improved steering control over a wider range of speed, improved speed stability, and improved suspension compared to existing skateboard trucks.

The invention discloses a steel and plastic composite bionic blade, which comprises a blade body, a rotary shaft and a blade holder. The thickness of the blade body is reduced from the middle to the edge in a streamline manner, the blade body is in the shape of an annular sector, the cross section of the blade body is arched, the rotary shaft is arranged on the short-arc side of the annular sector and deviates from the center line of the surface of the blade body, namely the rotary shaft is arranged at the front end of the rotation direction of the blade. The blade body is provided with a plurality of longitudinal reinforced ribs and a plurality of transverse reinforced ribs, and a blade elastic area is arranged at the back end of the blade body. The integral blade is in the shape of an annular sector which is smooth and streamlined and covered with plastics. The steel and plastic composite bionic blade utilizing reinforced bars as ribs is formed by plastics and a web body. Due to the fact that the stress of the blade elastic area is different along with change of impact force of water flow to a water turbine, the angle of the blade is changed automatically, instability caused by change of the impact force is compensated and stability of rotation speed of the water turbine is improved under elasticity and flexibility action of the blade, and accordingly stability in voltage and frequency of a water turbine power generator is guaranteed and the adaptable flow range of the water turbine power generator is wider while efficiency thereof is higher.

In the invention, a relief valve is connected with a magnetic reserving valve, a shuttle valve, a proportional direction valve and an actuator. Another relief valve is in parallel on one side of the said relief valve. A pressure compensator is connected with a magnetic reserving valve, an oil inlet, and an oil return port. One end of the shuttle valve is connected with an oil outlet of the proportional directional valve and a working cavity of the actuator. The other end of the shuttle valve is connected with another oil outlet of the proportional directional valve and another working cavity of the actuator.

The invention discloses a large-size intelligentized navigation mark revolving modulator and a control method. The revolving modulator comprises a lamp body (1) and a controller (2), wherein a step motor (9) is mounted on the lower portion of a central strut (4) on a chassis (3) of the lamp body (1) to drive a rotary shaft (11) to rotate through a coupling (10), a lens cage (13) is connected with the rotary shaft (11) by a lower tray (14), the upper end of the central strut (4) is provided with a lamp changer base (18), a lamp changer (19) and a lamp (20), the controller (2) is composed of a control unit capable of providing the rotary control over modulators, controlling the modulator rotate-speed adjustment process and the luminescence, providing the automatic lamp changing control and the automatic control of communication modes. The modulator relates to the large-size intelligentized navigation mark revolving modulator which has the advantages of high intelligentized degree, simple structure, low energy consumption, far jet distance and convenient transport, installation and maintenance.

The invention relates to the technical field of automobile control, in particular to an idling target rotating speed control method. The idling target rotating speed control method includes the stepsthat operating information of a vehicle is acquired, data of the engine load, the atmosphere pressure, the air inflow temperature and the cooling liquid temperature of the vehicle is acquired, an idling target rotating speed K1 is determined based on an engine load signal of the vehicle, then the idling target rotating speed K1 based on the engine load signal is corrected through the atmosphere pressure, the air inflow temperature and the cooling liquid temperature, and a current engine idling target rotating speed L is obtained. The influences of the engine load signal on the engine idling target rotating speed are fully considered, in combination with the atmosphere pressure, the air inflow temperature and the cooling liquid temperature, the idling target rotating speed best conforming to the operating condition of an engine is obtained, the stability of the engine during idling operation can be improved advantageously, and great promotional value is achieved.