13897 results about "Servo" patented technology

A servo that is attachabley secured to the rail car frame at each door lock that is connected to the latch via a draw bar with sufficient modulus to withstand the repeated force required to move the latch thus opening the door. The servo provides a pulling action with the motive force being pneumatic pressure but not limited to pneumatic whereas hydraulic or electric energy can be supplied to the servo providing the motive force to pull the draw bar attached to the latch, that when said servo provides a pulling force sufficient to over come the friction ot the latch to the striker plate the latch moves in a upward direction thus releasing the door to open. A second element of the servo is to provide a pushing action via the draw bar to the door latch to drive it all the way into the closed position.

An in-situ testing equipment for testing micromechanical properties of a material in a multi-load and multi-physical field coupled condition is disclosed. The equipment comprises a frame supporting module, a tension/compression-low cycle fatigue module, a torsioning module (21), a three-point bending module (6), an impressing module (33), a thermal field and magnetic field application module (34), an in-situ observation module (32) and a clamp body module (22). The frame supporting module provides a structural support for the whole testing equipment, the tension/compression-low cycle fatigue module is arranged at upper and lower ends of the testing equipment, the torsioning module (21) is directly arranged at a front end of the tension/compression-low cycle fatigue module, the three-point bending module (6), the impressing module (33) and the thermal field and magnetic field application module (34) are disposed on a support post at one side of the whole testing equipment through a common replacing component, and the in-situ observation module is disposed on another support post at the other side of the testing equipment. The clamp body module is connected to a front segment of the torsioning module, so as to clamp a test piece. An overall structure of the testing equipment is configured in a vertically symmetrical arrangement achieved by using four support posts. Two identical servo hydraulic cylinders (10) and two torsioning modules (21) are located at the upper and the lower ends of the testing equipment respectively and are used to perform a symmetrical tension/compression test and a symmetrical torsion test on the test piece (23) positioned centrally. The testing equipment is capable of realizing applications of five different types of loads including tension/compression, low cycle fatigue, torsion, bending and impressing, performing an intensive study on micromechanical properties of the material in the multi-load and multi-physical field coupled condition by using built-in electric, thermal and magnetic application modules and the in-situ observation module, and acquiring relations between deformation behavior, mechanism of damage, performance weakening of the material, applied loads and material properties.

The invention discloses an inclination-angle-constraint-based kinematic calibration method for a Stewart parallel robot. The method comprises the following steps of: firstly, theoretically establishing a novel kinematic constraint, which is an inclination angle constant constraint, namely keeping two inclination angles of a motion platform of the Stewart parallel robot relative to a horizontal plane constant group by group; secondly, using a servo regulating way to physically realize the established kinematic constraint in a high-precision way; thirdly, establishing a calibration model on the basis of a principle of least square according to the kinematic constraint; and finally, identifying a model parameter by solving a nonlinear least square optimizing problem and compensating for the model parameter in a robot control software. By making full use of a characteristic that a repeating precision of a measuring instrument is superior to a position measuring precision of the measuring instrument, the method has the advantages of good calibration effect, simple measurement, high automatism in the calibrating process and the like.

The invention provides a monitoring method for the turning stability of a digital control machine tool, relating to the monitoring technical field. As the performance of a servo system is continuously improved, a response speed, the sensibility and the like of the servo system are also continuously improved, thus, states of the machine tool can be reflected on a current of a driving motor during a cutting process. In the invention, through various signal processing methods, a plurality of characteristic values of current signals are extracted, a characteristic status vector is established as an input of a mathematical model, and a cutting status of the machine tool is output through analysis and calculation of the mathematical model. As the invention has the characteristics that the current signal has high anti-interference performance and is easy to be acquired, assistant tools are fewer, and the like, compared with a plurality of existing monitoring methods, the invention has the advantages of simple and feasible operation, good monitoring effects and the like; thereby, the invention can more easily realize the online monitoring for the processing states, and can effectively guarantee the processing security and the product quality.

A vehicle memory mirror system includes a vehicle mirror assembly and a control module. The vehicle mirror assembly includes a reflective element, a motor for positioning the reflective element about an axis, a monitor for monitoring the position of the reflective element with respect to the axis, and a mirror-based control including a position control which is operatively connected with the motor and the monitor in order to position the reflective element at a particular position. The control module is interconnected with the mirror-based control by an analog interface and includes a processor for providing analog signals on the analog interface indicative of a desired position of the reflective element with respect to the axis. The mirror-based control preferably includes a servo-amplifier circuit. The control module can control the speed of movement by formatting a series of sequential signals on the interface, each representing an incremental movement of the reflective element.

Aiming at the defects in the prior art, the invention discloses a control method of a speed regulator of a servo system of a flat knitting machine. A system in the prior art has low adaptability and low stability. According to a fuzzy proportional-integral (PI) control algorithm of the control method, the running speed of a transmission mechanism of the computerized flat knitting machine is used as a control object; the difference value between the practical reference speed and the feedback speed and the change rate of the difference value are served as input of a fuzzy controller; the input quantity is fuzzified through selecting an appropriate universe of discourse and an appropriate membership function; appropriate fuzzy rule tables are set by utilizing the practical tuning strategies of PI parameters; and after a Mamdani fuzzy reasoning algorithm and defuzzification processing are adopted, the variable quantities of parameter values of the PI controller are output, thereby realizing on-line correction of the PI parameters. By adopting the control method, the disadvantages of a traditional manual correction method for the PI parameters are overcome, and on-line real time correction of the PI parameters is realized, thereby improving the adaptability and the stability of the system.

A limit time cooperative control method of a mechanical arm servo system includes: building the dynamic model of the mechanical arm servo system, and initiating the system state, sampling time and related control parameters; approximating the nonlinear input dead zone linearity in the system into a simple time-varying system according to the differential mean value theorem, and deriving a mechanical arm servo system model with an unknown dead zone; calculating the tracking error, the non-singular terminal sliding mode surface and the first derivative of a control system; selecting a neural network approximation unknown function on the basis of the mechanical arm servo system model with the unknown dead zone, designing a neural network limit time cooperative controller according to the system tracking error and the non-singular terminal sliding mode surface, and updating a neural network weight matrix. By the method, additional inverted compensation of a nonlinear dead zone can be avoided, sliding model high-frequency buffeting is reduced, and limit time fast tracking of the mechanical arm servo system is achieved.

The rotary machine comprises a rotary shaft (2) supported by first and second radial magnetic bearings (5, 6) that are electrically controlled by a control device (13), said rotary shaft being fitted with an axial abutment device (100) comprising a rotor formed by a disk (101) secured to the rotary shaft (2) and interposed between first and second stators (102, 104) formed annularly around the rotary shaft and each including at least one annular coil (103; 105) controlled electrically by a system for servo-controlling the axial position of the rotary shaft. The stator (104) of the axial abutment device (100) further comprises a secondary induction circuit (106), and the disk (101) secured to the rotary shaft comprises a primary induction circuit (107) so that during rotation of the shaft, electricity is excited in the secondary induction circuit in order to supply energy to the radial magnetic bearings.

The invention discloses a biped robot capable of walking rapidly. The biped robot is composed of a servo motor, a motor support, a driving bevel gear, driven bevel gears, check pawls, ratchet wheel cam sets, ratchet wheel connecting pins, a driving pawl, oscillating bars, roller connecting pins, rollers, shanks, compression springs, screws, thighs and feet. The servo motor drives the driving bevel gear to rotate so as to drive the symmetrically-arranged driven bevel gears to rotate oppositely and the thighs to swing forwards and backwards; the shanks always make contact with cams in the ratchet wheel cam sets through the compression springs and supporting legs are longer than swinging legs through telescopic motion of the shanks. Compared with the prior art, the biped robot has the advantages that the robot can be driven by one servo motor, so that the robot is convenient to control and high in control accuracy; except for the servo motor, other structures of the robot are all mechanical structures, so that motion cooperation is convenient; the structure is simple, machining and installation are convenient, and the robot can walk rapidly.

The invention discloses an all-hydraulic autonomous moving manipulator and a moving method thereof and belongs to the technical field of manipulators. The all-hydraulic autonomous moving manipulator comprises an omnidirectional moving platform, a double manipulator, a power system, a visual system and a sensing and control system are arranged on the omnidirectional moving platform, a rotary waist device is arranged on the omnidirectional moving platform, the double manipulator is arranged on the omnidirectional moving platform through the rotary waist device and is of a human-simulated double arm structure with multiple degrees of freedom, the power system is in an engine-hydraulic driving mode, the visual system comprises a navigation camera, a large-visual-field servo camera and a hand-eye camera, and the sensing and control system comprises a joint force sensor, a joint position sensor and a six-dimensional sensor. The all-hydraulic autonomous moving manipulator can meet needs on wide-range moving of large-mass workpieces.

A rotary-table servo system neural network control method comprises (1) building a mechanical dynamic model of a permanent magnet synchronous motor rotary-table servo system, and initializing the system state, sampling time and relative control parameters; (2) according to the differential mean value theorem, enabling a non-linear input dead zone in the system to linearly approximate to a simple time-varying system, avoiding complex calculation of dead-zone inverse compensation, and finally inferring a rotary-table servo system model provided with an unknown dead zone; (3) at each sampling moment, calculating and controlling a system tracking error, a fast terminal sliding mode surface and a first-order derivative of the system; (4) based on the rotary-table servo system model provided with the unknown dead zone, selecting a neural network approaching unknown trend, designing an adaptive robust finite-time neural network controller according to the system tracking error, the fast terminal sliding mode surface and the first-order derivative of the system, and updating a neural network weight matrix; and (5) entering the next sampling moment, and repetitively executing the steps from (3) to (5).

The invention discloses a servo motor control system of an all-electric injection molding machine, comprising an injection molding machine computer controller, a servo motor controller and a PLC controller; the computer controller is connected with the servo motor controller through a CAN bus, the servo motor controller is connected with a servo motor, and the computer controller is connected with PLC controller; the servo motor controller can be a mould opening/closing servo motor controller, a plastic injection servo motor controller, a plasticizing pressure holding servo motor controller and an ejection servo motor controller; and the servo motor can be a mould opening/closing servo motor, a plastic injection servo motor, a plasticizing pressure holding servo motor and an ejection servo motor. The invention also discloses a control method for the control system; and technological procedures capable of being performed simultaneously are synchronously controlled through performing mould opening/closing control, plasticizing control, plastic injection control, pressure holding control, ejection control, mobile control of an injection platform and mould adjustment control on the motor of the electric injection molding machine, thereby saving one third of the production time.

The invention relates to a cross-scale micro nanometer grade in-situ composite load mechanical property testing platform, belonging to electromechanics. The cross-scale micro nanometer grade in-situ composite load mechanical property testing platform is composed of a precision drive and transmission unit, a signal detection and control unit and a clamping, connecting and supporting unit, wherein,in the precision drive and transmission unit, a DC servo motor provides power output, and a two-stage worm and gear mechanism with large reduction ratio and a precision ball screw mechanism transmit power; the signal detection and control unit is composed of a precision displacement sensor, a precision pull pressure sensor and a coder in coaxial rigid connection with the DC servo motor; and the clamping, connecting and supporting unit comprises a clamper component for locating and mounting a standard test specimen, and the like. The cross-scale micro nanometer grade in-situ composite load mechanical property testing platform can be compatible with imaging instruments, and performs a cross-scale in-situ micro nanometer composite load test on a macroscopic test specimen through observation via the imaging instruments, so as to perform in-situ monitoring on processes of microscopic deformation, injury and fracture of materials, so that a new testing method for revealing the mechanical properties and the injury mechanism of the materials at the micro nanometer grade is provided.

PCT No. PCT/JP97/01089 Sec. 371 Date Nov. 26, 1997 Sec. 102(e) Date Nov. 26, 1997 PCT Filed Mar. 28, 1997 PCT Pub. No. WO97/37291 PCT Pub. Date Oct. 9, 1997Actual machining positions P1, P2, . . . corresponding to command positions S1, S2, S3 . . . of each block of NC data are obtained by trial machining. Positions that correspond symmetrically to the actual machining positions P1, P2, . . . with respect to the command positions S1, S2, S3 . . . of each block are obtained. Modified NC data are created with use of the symmetrical positions as modified command positions for each block. The modified NC data include correction values for modifying positional differences attributable to a delay in a servo system. Therefore, if machining is carried out in accordance with the modified NC data, the correction values and a follow-up delay attributable to the actual delay in the servo system cancel one another, so that a high-accuracy work shape can be obtained.

A bi-modal bleed valve assembly is provided. In one embodiment, the bi-modal bleed valve assembly includes a housing assembly having a bleed inlet, a bleed outlet, a control servo port, and a control chamber therein. A main flow control valve is fluidly coupled to the control chamber and configured to move between an open position and a closed position to regulate fluid flow from the bleed inlet to the bleed outlet. The main flow control valve is configured to move from an open position to a closed position when the pressure within the control chamber surpasses a predetermined threshold. A switching valve is fluidly coupled between the bleed inlet, the servo control port, and the control chamber. The switching valve is configured to route fluid flow into the control chamber from: (i) the bleed inlet in an autonomous mode, and (ii) the servo control port in a servo-controlled mode.

The invention discloses a five-axis linkage loading test device for a machine tool. The device consists of a following loading mechanism mechanical part and a measurement and control system. The following loading mechanism mechanical part applies a load to a spindle through an interface of the spindle of the machine tool. The measurement and control system is used for realizing servo motor control, mechanism motion control, load calculation and signal processing functions of the following loading mechanism mechanical part. The five-axis linkage loading test method for the machine tool comprises the five major steps of: 1, measuring load data; 2, establishing a load spectrum; 3, organizing tool path data; 4, performing hardware solidification of the data; and 5, calibrating and correcting a database. The device and the method are universal and widely applicable to various types of tests in the reliability of the machine tool, and have practical significance and reference value for the research and development of high-performance load simulators in China.

The invention discloses a dynamic control method of a linear steering engine electric loading system, comprising the following steps: modeling a servo loading motor, constructing a torque balance equation, and constructing a linear steering engine mechanism model; building a ball screw pair motion model; analyzing the transfer function of the electric loading system, designing a three-closed-loop control method based on a current inner loop, a position outer loop and a force outer loop, and applying complex vector PI control in the current inner loop to enable the current of the servo loading motor to track instruction signals quickly and accurately; and finally, making feed-forward compensation for angular velocity, and verifying the control method. The method takes an electric loading system driven by a permanent magnet synchronous motor as a specific object, and considers the impact of the characteristics of the linear steering engine and the coupling degree between the linear steering engine and the electric loading system. The active force of active displacement of the linear steering engine is inhibited, and the loading precision of the linear loading system is improved. Moreover, a verification method is put forward, which makes a linear load simulator better evaluated.

The invention provides an automatic loading robot for packing boxes. The automatic loading robot comprises a PLC automatic control system, a packing stacking trolley and a transportation line, wherein the packing stacking trolley comprises a portal frame; a travelling device is arranged at the lower end of the portal frame; the front ends at the two sides of the portal frame are fixedly connected with a large Z axis; the large Z axis is connected with the X axis; the front end of the X axis is equipped with a small Z axis; a lifting device is arranged on the large Z axis; an X-axis servo motor is mounted on the X axis through a gear rack; the small Z axis is connected with a box drawing platform through a slide block and a guide rail brake; a box pushing device is arranged on the box drawing platform; a distributing device is arranged at the front end of the travelling device; and a reversing device and a normalizing device are arranged on the transportation line. The automatic loading robot can extend into a car to complete automatic stacking, and packing boxes do not need to be arranged into rows in advance, so that space is reduced, and loading stacking efficiency is improved; and a mechanical hand adopts a box pushing mode for the packing boxes, is free of damages on the packing boxes, can be operated in the car, and is limited by the car.

The invention relates to a rotational inertia on-line identification method for an alternating current (AC) permanent magnet synchronous motor servo system and belongs to the technical field of rotational inertia identification for motors. The method aims to solve the problems that an on-line inertia identification method based on the traditional least square method is high in requirements for storage space and arithmetic speed of digital processing chips. The method adopts a load torque identification part to identify a constant load disturbance torque value TL; a system dynamic state judging part is adopted for judging whether rotation speed of a motor is at a dynamic change stage, and when the rotation speed of the motor is at the dynamic change stage and the rate of change of the rotation speed of the motor is higher than a critical change rate for identification of rotational inertia of the motor, a rotational inertia estimation value is obtained through calculation by utilization of a least square estimation method based on recursion; and when the rotational inertia on-line identification process meets requirements of a preset output rotational inertia estimation value and meets a requirement for precision, the rotational inertia estimation value is output and the rotational inertia on-line identification process is completed. The method is used for rotational inertia on-line identification for the motor servo system.

The invention provides a specified performance back-stepping control method of a mechanical arm servo system. The method comprises the steps of constructing a dynamic model of the mechanical arm servo system; initializing the system state, sampling time and control parameters; linearly approximating a nonlinear input dead area of the system as a simple time varying system according to the differential mean value theorem; deviating a mechanical arm servo system model with the unknown dead area; calculating the tracking error of the control system, FC (funnel control) error variation and differential. With the adoption of the method, the problem of control buffeting of a sliding die can be reduced, the system of the dead area input on the system can be effectively avoided, and the specified performance control of the mechanical arm control system can be achieved.