1550 results about "Servo control system" patented technology

A digital servo control system for disk drives is an "embedded" system-one in which servo control information is embedded on the same disk surface as the user data. In contrast to known embedded-servo systems in which a space-consuming series of many dibit pairs is present, the present system provides only a single dibit pair in a fractional positional error (PESF) area. Thus, the disk drive's read head encounters only a single dibit pair per sample period (or per data sector), thus saving valuable disk space that may be used for user data. Various pre-processing methods may be provided so as to pre-process the measurement derived from the single dibit pair per sample period (or data sector), so as to compensate for non-ideal characteristics of the dibit measurement. The system thus provides an accurate and robust servo control system, while sacrificing a minimum amount of valuable disk space to the servo information field.

The systems, methods and products of the invention include systems and methods for manufacturing servo tracks on a magnetic tape. In one aspect, the invention includes systems for manufacturing magnetic tapes having servo tracks thereon wherein the servo tracks are optically detectable and are capable of being processed by a servo control system for maintaining alignment of a magnetic recording head with the data tracks on the recording side of the magnetic tape. In one practice, the manufacturing systems described herein engrave the servo tracks onto the non-recording side of a magnetic tape by directing a laser beam at the non- recording side of the magnetic tape. In another practice, the manufacturing systems described herein engrave the servo tracks onto the magnetic side of a magnetic tape by directing a laser beam at the magnetic side of the magnetic tape. Such engraved patterns can act as optical servo tracks for maintaining alignment of the recording head with the data tracks on the magnetic tape.

The systems, methods and products of the invention include systems and methods for manufacturing servo tracks on a magnetic tape. In one aspect, the invention includes systems for manufacturing magnetic tapes having servo tracks thereon wherein the servo tracks are optically detectable and are capable of being processed by a servo control system for maintaining alignment of a magnetic recording head with the data tracks on the recording side of the magnetic tape. In one practice, the manufacturing systems described herein engrave the servo tracks onto the non-recording side of a magnetic tape by directing a laser beam at the non-recording side of the magnetic tape. In another practice, the manufacturing systems described herein engrave the servo tracks onto the magnetic side of a magnetic tape by directing a laser beam at the magnetic side of the magnetic tape. Such engraved patterns can act as optical servo tracks for maintaining alignment of the recording head with the data tracks on the magnetic tape.

A method for reducing an estimation period for repeatable runout (RRO) errors in a disk drive comprising a head, a disk surface having a track partitioned by servo-wedges, and a servo control system for controlling the movement of the head relative to a track during revolutions of the disk. The method includes estimating the RRO errors of the track based on a) a series of position error signal values obtained during a current revolution of the disk surface, and b) a previous estimation of the RRO errors of the track obtained during a previous revolution of the disk surface and determining a differential value between a first measure of the estimated RRO errors and a second measure of the previous estimation of RRO errors, and repeating the estimating and determining for subsequent revolutions of the disk surface until the determined differential value is smaller than a pre-selected threshold value.

A method for improving the performance of a rotary actuator in a disk drive, the rotary actuator comprises a voice coil motor (VCM) characterized by a torque parameter, the disk drive comprises a servo control system having a motor driver circuit for receiving a series of command effort signals (CEFs) transmitted based on a first seek profile, and for providing an operating current to VCM based on the CEFs for causing a movement of the actuator from a first radial location to a target radial location. The method includes recording the transmitted CEFs, and while actuator is moving: adjusting each recorded CEF to account for a disk drive influence on actuator movement; storing adjusted CEFs; monitoring velocity of moving actuator; calculating an acceleration value corresponding to moving actuator from the stored CEFs and monitored velocity; and adjusting the acceleration value to account for a radial torque parameter variation.

A disk drive is disclosed comprising a disk, a head, and control circuitry comprising a servo control system operable to actuate the head over the disk. A plurality of disturbance signals is generated in response to a vibration. A plurality of correlations is generated in response to each disturbance signal and an error signal of the servo control system. At least one of the disturbance signals is selected in response to the correlations. A feed-forward compensation value is generated in response to the selected disturbance signal, and the feed-forward compensation value is applied to the servo control system to compensate for the vibration.

A disk drive that includes a base, a magnetic disk, a rotary actuator that carries a head for reading and writing data from the disk in a track-following mode under the control of a servo control system, and at least two sensors--one fixed sensor rigidly coupled to the overall disk drive and one mobile sensor mounted to the rotating actuator--for differentially detecting accelerations of the rotary actuator relative to the overall disk drive and its disk. The disk drive detects and actively compensates for accelerations imparted to a balanced actuator that has an effective imbalance. The fixed sensor is preferably mounted to a PCBA that is secured to the base. The mobile sensor is preferably mounted to an actuator arm of the rotary actuator, as far outboard as possible, and so as to align with the fixed sensor as the rotary actuator swings through its range of travel. The preferred sensors are linear accelerometers.

The invention discloses a fluid-solid-heat coupling triaxial servo percolation device for gas-contained coal, comprising a lifting stand, a hydraulic servo control system, an axial loading device mounted at the top of the lifting stand and a triaxial pressure chamber connected with the lower end of the axial loading device. A thermostatic water tank is arranged below the triaxial pressure chamber; a movable worktable is arranged above the thermostatic water tank; the lower end of the triaxial pressure chamber is arranged on the movable worktable; heating tubes are arranged in the thermostatic water tank; and a water inlet valve, a water drain valve and a water-bath circulating water pump are arranged outside the thermostatic water tank and are communicated with the thermostatic water tank. In the hydraulic servo control system, an axial compression loading oil pump is communicated with an oil inlet and an oil outlet by a pipeline, and a peripheral compression loading oil pump is communicated with an oil intake / drain hole by a pipeline. The fluid-solid-heat coupling triaxial servo percolation device for gas-contained coal can carry out the research of gas-contained coal percolation tests in states, such as different terrestrial stresses, different gas pressures, different temperatures, and the like and the distortion and failure characteristics of the gas-contained coal in a percolation process.

A servo controlled system is disclosed for providing simulated feel equivalent to that of traditional mechanical hand controllers using servomotors. Position and force sensor signals are processed and used in a feedback loop that controls the motor mechanically connected to the stick. The overall feedback loop is comprised of a low-level motor feedback loop, and high-level force feel loop. The two loops have associated performance parameters that can be specified independently. The high-level feel force loop is comprised of a static and dynamic performance components. Static and dynamic performance components can be specified independently. The system allows variable and / or additional force cues to be specified externally to the system and felt by the operator. The system also allows external signal to backdrive die stick to follow a specified motion. The control framework permits the electronic coupling of the motion and applied forces of pilot and co-pilots in a dual arrangement while retaining the above-mentioned features. It also allows asymmetric force feel gradients to be implemented for each stick, or for a stick relative to a second one. A zero breakout or detent can be provided at the stick null displacement. For cross-coupled sticks, the detent can be shared as in a mechanically cross-coupled system, implemented independently on each slick, or any combination of these two. The control framework also provides the simulation of mechanical compliance in the cross-coupling of the two sticks in case of a jam or of force fight between the pilots, and automatic de-coupling of the sticks.

The invention discloses an intelligent control method of a driverless vehicle tracking a desired trajectory. The method is characterized by comprising the following steps of: establishing a body coordinate system, and determining the position information of the vehicle; calculating a membership degree function of a road curvature characteristic according to a radian value, and defining a fuzzy rule to calculate a decision output speed; according to the distance the vehicle runs for 1.5-2.5 seconds, searching for the trajectory points larger than the distance and closest to the vehicle in the coordinate sequence of the desired trajectory; calculating the moving curvature of the vehicle according to an adaptive proportion-differential-integral control algorithm formula; and finally judging whether the target point of the current control cycle is the last point selected from the road point sequence; if so, outputting a signal to a brake servo control system to start the brake to slow down the vehicle; otherwise, outputting a voltage signal by a controller local area network module to keep and control the accelerator opening so that the vehicle continues proceeding. Through adoption of the intelligent control method, the driverless vehicle can realize a function of tracking the desired trajectory, and has certain adaptability to the change of the road curvature characteristic.

The invention discloses a wear type lower limb assistant robot, a folding method thereof and a hand luggage for carrying. The robot is characterized by comprising a lower limb assistant mechanical device and a servocontrol system, wherein the lower limb assistant mechanical device is provided with wearable assistant mechanical legs which are symmetrically arranged on the two sides of a wearable waistband. The wearing load on human bodies can be effectively relieved, and the robot has the characteristics of high safety performance, simple man-machine coordination control, good following assist effect, high cost performance and the like; the robot can be changed into a portable body which is compact in structure through the folding method, and a user can conveniently carry and store the robot in various manners through matching with the hand luggage for carrying, so that the nursing requirements of the middle-aged and the aged people on daily activities such as walking and walking up and down stairs can be better satisfied.

A servo control system and method controls systems at least partially on the basis of an observable variable that has an absolute value functional relationship with the controlled variable and does not change sign for positive and negative variations from a nominal value. The control system and method find particularly advantageous application in magnetic storage hard disk drive systems because the system allows such hard disk drives to perform servo operations such as track following on the basis of the data signals being read from the track. A particularly useful source of the absolute value observable variable is a read channel chip that performs decoding of data recovered from the disk. Error measures are developed as the data signals from the disk are processed and decoded, including error measures from the slicer used in an adaptive equalization process and from the data decoder, which may be a Viterbi decoder. One or more of these error measures is provided to an output terminal of the read channel chip for use with an absolute value control system and method.

A disk drive is disclosed employing a primary actuator for rotating an actuator arm about a pivot in coarse movements, and first and second secondary actuators coupled to the actuator arm for actuating first and second heads in fine movements. A servo control system generates a first control signal applied to the first secondary actuator to position the first head over the first disk surface in fine movements while accessing the first disk surface. The servo control system phase shifts the first control signal by a predetermined phase to generate a second control signal applied to the second secondary actuator to attenuate excitation of at least one arm vibration mode.

The invention relates to new type numerically controlled machine tool magnetic suspension feeding system. It includes engine base, two guide rails, linear motor stator part, four pairs of differential action suspension electromagnets, two pairs guide electromagnets, linear motor mover part, optical grating measuring system, and support device. The control system of the invention adopts clearance control system between DSP main controller suspension electromagnet, guide electromagnet, and the guide rail, and linear motor servo control system. Thus the invention can eliminate platen no touch support and guide, remove frictional wear, increase feed speed and positioning accuracy, supply enough bearing capacity and thrust, can be used in practical processing.

The invention discloses a frame construction of an automatic stereowarehouse, a piler is positioned on a guide rail and used for loading and unloading and transporting goods; a plurality of aisle racks are positioned under the guide rail and used for storing the goods loaded by the piler; a buffering shelf is positioned between the in-out window of the warehouse and the aisle racks and used for the temporary storage of the incoming and outgoing goods; an automatic incoming and outgoing mechanism is positioned between the in-out window of the warehouse and the buffering shelf and used for incoming and outgoing the goods; and a computer is in communication connection with the servo-control system and the automatic incoming and outgoing mechanism of the piler and used for controlling and managing the goods of the warehouse. The piler which takes a crown block and the linear guide rail as the basis is matched with the buffering technique and the automatic transmission mechanism to realize the automatic stereowarehouse which can adapt to deep cooling environment. The frame construction has the advantages of high degree of automation, low energy consumption and low cost, is applicable to middle-size and small-size deep cooling quick-freeze warehouses, and has positive realistic meaning and social and economic profits for saving energy, improving the working conditions of workers and guaranteeing food security.

A number of laser beam stations emit vertically separated parallel planes and / or ray-planes of laser light that can be discriminated by their respective plane elevations, modulation of the laser light, time synchronizing, etc. Identifying the laser plane would also imply an identification of the source laser beam station, and thus a precise indication of the elevation at the point of optical intercept. Alternatively, a single laser beam station is used that can emit several different monochromatic color planes and / or ray-planes of laser light. Monochromatic laser diodes, for example, are used for point-light sources and rotating or on-end conical mirrors are used to convert the diode laser light to the required monochromatic color planes and / or ray-planes of laser light. Receivers, generally held on masts attached to motor grader, bulldozer, loader, and excavator machines are used to sense the vertical reference position of the monochromatic color planes and / or ray-planes of laser light, relative to the earth cutting blade of the machine. Fixed-color filters, color filter wheels, and / or linear array photodetectors are used to discriminate amongst the colors and to exactly sense the plane of intersection with the machine. The results of the sensing are either displayed to an equipment operator for manual adjustment of the blade to an automatic servo control system connected to hydraulically control the blade.

The invention provides a driving device of a permanent magnetic brushless direct current (DC) servo motor, comprising a control unit, an interface unit and a driving unit; the control unit is connected with the driving unit by the interface unit; the control unit adopts a field programmable gate array (FPGA) and has high integration, low power dissipation and good operation real-time performance; the key point of the design of the control system is the control to three loops: a current loop, a speed loop and a position loop and the integral matching of the three loops so that three control modes of moment, speed and location can be realized; the control system can be used for simple speed regulation and also can be applied to high-precision positioning control situations; and when the brushless servo control system of the driving device is adopted, the current detection feedback signal and the magnetic pole detection feedback signal are directly obtained from the feedback element of the permanent magnetic brushless DC motor, thus being different from the traditional sampling method of the feedback signal of the servo system, thereby ensuring the signal sampling precision and reducing the cost.

A wafer stage assembly, wafer table servo control system, and method for operating the same, are provided for use in combination with a projection lens assembly in a semiconductor wafer manufacturing process. The wafer stage assembly includes a wafer stage base supporting a wafer stage to position the semiconductor wafer, a wafer table connected to the wafer stage to support the wafer, a plurality of sensors, and an actuator. The sensors include a first sensor to determine a position of an exposure point on the wafer relative to the projection lens assembly, and a second sensor to determine a position of a focal point of the projection lens assembly relative to the exposure point. To increase focusing properties of the projection lens assembly, in response to the determined positions of the exposure point and the focal point, the actuator moves the wafer table so that the exposure point substantially coincides with the focal point. The wafer table servo control system is provided to operate the wafer stage assembly. The servo control system includes a first sensor controller to generate a first position signal of an exposure point on the wafer table relative to a projection lens assembly, and a second sensor controller to generate a second position signal of a focal point of the projection lens assembly relative to the exposure point. The servo control system also includes a wafer table controller to determine and generate a correction force corresponding to the first and second position signals. The correction force is then exerted onto the wafer table to bring the exposure point to substantially coincide with the focal point.

The energy-saving servo control system for injection molding machine includes one servo motor, one constant displacement oil pump providing pressure to the hydraulic system, one pressure sensor, one rotation speed sensor, and one control element, as well as one energy-saving controller connected to the outputs of the pressure sensor and the rotation speed sensor for automatic closed-loop regulation of pressure and flow rate. The servo motor includes one torque regulating input and one rotation speed regulating input; the energy-saving controller includes one pressure control module and one flow rate control module with outputs connected to the servo controller; the servo controller includes one torque driving unit and one rotation speed driving unit connected separately to the torque regulating input and the rotation speed regulating input of the servo motor. The energy-saving servo control system has high adaptability, high sensitivity, high accuracy and high energy-saving effect.

The invention discloses a four-axis full-automatic high-speed dispensing robot servo-control system. The four-axis full-automatic high-speed dispensing robot servo-control system is characterized in that an FPGA (Field Programmable Gata Array) processor is introduced in a single-chip DSP (Digital Signal Processor) so as to form a DSP-FPGA based dual-core processor, the dual-core processor concentratedly designs the traditional multi-controllers system realized by a singlechip and fully considers the function of a battery in the system so as to realize that one controller synchronously controls four axes, and a four-axis servo system of heaviest workload in a four-axis full-automatic high-speed dispensing robot servo controller system is controlled by the FPGA processor, so that the characteristic of faster data processing speed of the FPGA processor is fully played; a human-computer interface module, a path read module, an on-line output module, a data memory module, an I (Input) / O(Output) control module and an image acquisition and processing unit are controlled by the DSP, so that the DSP and the FPGA processor divide the work, the DSP is free from heavy workload, therefore the capacity of resisting disturbance of a dispensing robot is greatly enhanced.

The invention provides a loading and unloading handling mechanical arm for a solar cell module, and the mechanical arm provided by the invention is used for realizing the functions of loading and unloading in a solar cell module producing process. The loading and unloading handling mechanical arm is characterized by consisting of a mechanical arm mechanism I, a horizontal motion unit II, two vertical motion units III, a pallet lift mechanism IV and a frame V, wherein the mechanical arm mechanism is of an aluminum alloy frame combined structure, and is provided with a plurality of groups of sucker modules so as to realize safe handling of solar cell modules in different specifications; and the horizontal motion unit and the vertical motion units adopt servo motors as drive, and drive the mechanical arm mechanism through a synchronous cog belt and a ball screw assembly respectively to realize accurate motion positioning in horizontal and vertical directions, and the motion units of two directions can independently or simultaneously move. A position servo control system is of a hierarchical control structure formed by a human-computer interaction layer, a motion control layer and a servo control layer. The handling mechanical arm has the advantages of large working space, high positioning accuracy, small motion inertia, reliable and smooth motion and suitability for handling large-sized fragile solar cell modules in different specifications.

In a servo control system, a numerical control device and at least one servo amplifier are connected to each other with a serial bus to control a servo motor connected to the servo amplifier. In this system, data transfer systems of at least two types for the serial bus are set, and a data transfer system is selected by a parameter set in the numerical control device.

The invention discloses an automatic welding device and welding method for stators. The automatic welding device comprises a shell body, a base, a rotary table, a lifting mechanism, a compressing device, welding guns, an electrical cabinet, a guide rod, a hydraulic cylinder, a lead screw, a servo motor, dabber fixtures and a servo control system, wherein the rotary table is installed on the base through a rotary shaft, the lifting mechanism is installed in a rectangular tank of the base, the two dabber fixtures which are the same in structure are installed on the horizontal plane of the rotary table, and the welding guns are evenly distributed on the outer circumference of the compressing device. The rotary table is provided with the two dabber fixtures and has the work station rotating function, and two stators can be installed at the same time and then are welded and machined through rotation of the rotary table; meanwhile, the welding guns are installed at the same time, welding of multiple passes of welding lines can be conducted, and accordingly working efficiency is improved. A servo motor of the automatic welding device is controlled by the servo control system, and machining speed and position are accurate.

A servo-controlled system is disclosed for providing simulated feel equivalent to that of traditional mechanical hand controllers. Processed position and force sensor signals are used in a feedback loop that controls the motor mechanically connected to the stick. The feedback loop comprises a low-level motor feedback loop, and high-level force feel loop. The latter comprises static and dynamic performance components. The system allows variable and additional force cues to be specified externally to the system and felt by the operator, and / or external signal to backdrive die stick to follow a specified motion. The control framework permits the electronic coupling of motion and applied forces by pilots in a dual arrangement while retaining the above-mentioned features. It simulates cross-coupling mechanical compliance due to force fight between pilots detents and asymmetric force feel gradients. Parameters associated with loops and performance components can be specified independently.

The invention discloses a multi-field coupling penetration test device and a multi-field coupling penetration test method for cracked rock. The device comprises a computer servo control system, a confining pressure chamber, a hydraulic system, a temperature control system and a chemical solution system, wherein the hydraulic system and the confining pressure chamber are connected by virtue of a confining pressure device, an axial pressure device and a seepage device respectively; the temperature control system is arranged outside the confining pressure chamber; and the chemical solution system is connected with the seepage device. The test method comprises the following steps: opening the hydraulic system, and loading an oil source; putting a sample into a pressure chamber; loading axial pressure and confining pressure; loading the seepage pressure; loading a chemical field; applying temperature; and measuring the data. The four-field loading systems are independent from one another, the evolution test research of permeability characteristics and mechanical properties of the cracked rock can be really simulated under high water pressure, large hydraulic gradient, temperature change and water chemistry complicated conditions, and the whole-process experimental research of rock deformation damage and penetration, stress, chemistry and temperature coupling can be performed.

The invention discloses a control method for motion stability and outline machining precision of a multi-shaft linkage numerical control system. The control method achieves control on the motion stability and outline machining errors of the multi-shaft linkage numerical control system by using a compound control mode of multi-shaft parameter module predictive control and non-linear self-adaptive fuzzy proportional-integral-derivative (PID) control. Simultaneously, error module calculating efficiency is improved by building an outline error module, a speed error module and an acceleration error module. By means of performance optimization indexes, tracking errors, outline errors, speed errors and acceleration errors of the system are minimum, and control performance of a multi-shaft servo control system is improved. Multi-shaft parameter module predicative control increment is solved through a simplified calculating module so as to meet real-time requirements of the control system. Robust property of the multi-shaft linkage numerical control system is improved by adopting the non-linear self-adaptive fuzzy PID control method. The control method effectively improves the motion stability and outline machining precision of the multi-shaft linkage numerical control system.

A servo control system includes a peak detection module that detects peak times of spiral signals generated by reading spirals prewritten on a magnetic medium. The servo control system includes a control module that determines positions of the spirals based on the peak times, stores the positions of the spirals, seeks and tracks the spirals using the positions, and writes servo on the magnetic medium based on the positions of the spirals.

The invention relates to a test device for chemical solution seepage in rock single fracture at different temperatures. The test device comprises a sample apparatus system, an axial compression system, a confining pressure system, a chemical solution pressure loading system, a servo control system and a data acquisition system. The sample apparatus system comprises a sample, a cylindrical heat-shrinkable tube and a cylindrical rigid spacer block; one end of the rigid spacer block is provided with a permeation hole, a circular permeation groove and a radial permeation groove; the chemical solution pressure loading system is provided with a heating device; the heating device comprises a heater and a temperature sensor; the heater is disposed on a solution pipe at one side of the sample apparatus system; and the solution pipe between the heater and the sample apparatus system is provided with the temperature sensor. To increase test precision, the wall of the solution pipe between the heater and the sample apparatus system is provided with a heat insulation material; and a ceramic heater is employed.

The invention discloses a robust adaptive control (RAC) method of an electro-hydraulic position servo control system for simultaneously considering uncertainty of matching and mismatching. The method is fused with an adaptive control (AC) method; the inverse design is performed through skillfully designing a nonlinear robust control law and using the continuously differentiable properties, so that the parameter estimation of the system is not affected under the condition that the system has parameter uncertainty, uncertainty nonlinearity of matching and mismatching; the performance of asymptotically tracking can be obtained. Through the disclosed control method, the robustness of the traditional adaptive control on the uncertainty nonlinearity of external load disturbance is increased; the uncertainty nonlinearity of matching and mismatching can be simultaneously treated; an excellent tracking performance can be obtained.

The invention discloses a six-axis degree-of-freedom manipulator. The six-axis degree-of-freedom manipulator comprises a base, wherein the base is in transmission connection with a first transmission mechanism, a second transmission mechanism, a third transmission mechanism, a fourth transmission mechanism, a fifth transmission mechanism and a sixth transmission mechanism in sequence, wherein the six transmission mechanism is in transmission connection with a mechanical palm part. A series of functions such as welding, spraying and handling are combined, the newest servo control system is adopted, and a series of new functions which can meet the industrial production of users are developed on the platform. The conventional complex transmission process is greatly simplified in the aspect of mechanical transmission, and the characteristic that bevel gear mesh type transmission is generally adopted by the conventional six axes is cancelled, so that the manipulator has a compacter structure and higher transmission efficiency, is more accurate in control and can effectively prevent the situation of jitter due to joint movement.