1575 results about "Stepper motor control" patented technology

The invention relates to a method for measuring the volume of a large irregular bulk grain pile based on dynamic three-dimensional laser scanning. The method comprises the following steps of: arranging a guide rail in the middle of the top of a barn along the width direction, wherein the guide rail is provided with a slide block controlled by a stepping motor, and a laser radar scanner is installed on the slide block; moving the slide block from one end to the other end of the top of the barn at a constant speed to drive the laser radar scanner by the slide block to finish scanning on the surface of the whole bulk grain pile, wherein the laser radar device is a one-dimensional scanning device to realize linear scanning and returning coordinate data, and the master control computer is used for transmitting pulses to the stepping motor and processing the signal; acquiring point cloud data of the surface of the bulk grain pile through the master control computer, determining the distribution density of scanned points for calculating the volume according to an allowed error value of the grain pile measured by the user, and calculating the weight of the grain pile according to the grain density provided by the user; and generating a point cloud graphic matrix attached with coordinates through scanning space morphology by guide rail moving type three-dimensional laser, performing surface fitting to form an irregular bulk grain pile appearance, and thus obtaining the volume of the irregular bulk grain pile. The volume of the large irregular bulk grain pile can be rapidly and effectively measured at high precision, and remote monitoring can be realized; and moreover, the method is low in cost and easy to implement.

The invention relates to a method and a device for curing a fiber-reinforced resin-based composite material component by utilizing microwaves. The microwaves which are generated by a microwave source with linearly-adjustable power are guided into a resonant cavity, and the microwaves penetrate through and heat the composite material, so that the composite material can be quickly cured and formed. By adopting the advanced octagonal microwave-mode resonant cavity, the uniformity of an electromagnetic field inside the device can be realized; the interference of the reflection wave on the microwave source can be reduced by adopting an automatic impedance matching system, so that the optimal transmission of the microwave power can be realized. A vacuum pipe connector and a temperature sensor are arranged on the inner side wall of the octagonal multi-mode resonant cavity, a glass worktable is arranged inside the resonant cavity, and the rotation of a ball screw is controlled through a stepper motor to control the back-forth movement of the worktable. A choking groove is adopted to prevent the leakage of the microwave. By adopting the method and the device, the problems of the traditional autoclave forming method that the time for manufacturing the fiber-reinforced composite material is long, the energy consumption is high and the heat is non-uniform can be solved, the curing time can be saved, and the quality and performance of the composite material component can be improved.

The invention relates to a pipeline detection robot. The pipeline detection robot mainly comprises a laser detection mechanism (1), a traction mechanism (2), an electromagnetic ultrasonic detection mechanism (3) and an electronic cabin (4), all of which are connected through connecting hinge shafts; the traction mechanism (1) adopts a single-motor all-drive mode and is driven by a turbo-worm synchronous belt to supply a walking power to the robot; the laser detection mechanism (2) comprises a laser displacement sensor, a rotating arm, a counterweight, a support body and the like and is used for measuring surface corrosion and deformation of a pipeline; the electromagnetic ultrasonic detection mechanism (3) comprises a support assembly, a probe and a fixing plate and is used for measuring the wall thickness and the crack defect of the pipeline; the electronic cabin (4) is used for carrying auxiliary components, such as a stepping motor controller, a servo motor driver, a power supply and an FPGA (Field Programmable Gate Array) control panel. The pipeline detection robot disclosed by the invention can be used for finding the defects, such as pipeline corrosion, cracks and deformation, carrying out in-service detection on an oil and gas pipeline in a working process, carrying out targeted repair, maintenance and replacement according to a detection result, reducing the maintenance cost and guaranteeing safe and stable operation of the oil and gas pipeline.

A stepping motor is driven in both closed-loop and open-loop modes while initiating microstepping after a predetermined threshold velocity has been reached. A feedback device such as an encoder is mounted on the stepping motor shaft and the encoder keeps track of the mechanical position of the rotor. Based on feedback from the encoder, stator phases are activated to maintain a 90° phase advance and produce maximum torque. A lead angle compensation technique is used to advance the motor lead angle, to allow for the excitation currents to reach maximum even at higher speeds. The stepping motor controller employs this strategy in order to produce maximum torque across a wide range of motor speeds and actuator motions.

The invention relates to a shooting network-based method and system for warning of drowning prevention in a swimming pool. A fixed water camera is installed above a water surface of a swimming pool and a rotatable underwater camera is installed under the water surface of the swimming pool; the water camera and the underwater camera output signals to connect a PC machine or a DSP and a PC machine by video acquisition cards at all paths; the PC machine or the DSP output a control signal to connect an alarm and a stepper motor that controls a cloud platform to make rotations. Besides, the PC machine or the PC machine and the DSP includes/include a spray detection module, a coordinated control module, an underwater drowning determination module and an alarm positioning module. According to the invention, omnibearing and multi-angle warning coverage on a swimming pool can be realized. When a swimmer is drown, the system carries out intelligent determination and emits alarming; and an object position can be provided, so that a lifeguard is warned to carry out rescue at the first time to ensure personal safety of the swimmer.

The invention discloses a stepping motor control system and a control method thereof. The stepping motor control system comprises a controller, a stepping motor controller, a stepping motor, a transmission mechanism, a load and a photoelectric encoder, wherein the controller sends a plurality of pulses with a certain frequency and a certain quantity to the driver which receives the pulse information and a direction signal and acts on the stepping motor, the stepping motor drives the load through a driving mechanism, and the photoelectric encoder feeds back and transfers position information to the controller. The invention realizes high-accuracy positioning through a fuzzy control method, achievesprovides higher operation effect by adopting the combination of dual compensation feedback and open-loop control, has the desynchronizing detection function for compensatingrehending and feeding back failure information and also hasprovides higher failure suitability.

The invention provides a three-dimensional detection device and method for scanning the appearance of a welding seam in high-frequency resistance welding based on linear structured light. The three-dimensional detection device comprises a linear structured light sensor, a linear displacement transmission system and a computer, wherein the linear structured light sensor comprises a laser, an industrial camera and a fixed panel; and the linear displacement transmission system comprises a base, a stepping motor and a stepping motor controller. A welded object is placed on the base of the transmission system, scanning is performed by adopting the linear structured light, the industrial camera shoots a laser stripe image of the welding seam, the laser stripe image is processed through a software system to obtain three-dimensional point cloud data of the welding seam, appearance characteristics such as the width and the height of the welding seam are acquired through analysis, and thus judgment can be performed on the quality of the welding seam. The three-dimensional detection device has the advantages of high precision, safety, reliability, real-time detection and the like, improves the efficiency of welding seam quality detection and can achieve automatic detection for the welding seam quality.

A throttling valve assembly actuated by a stepper motor having a double diaphragm seal and integral throttling surface. The throttling surface interfaces to a mating orifice and port arrangement to provide a smooth control regime for various process fluids. Because of the unique design of the flow paths the fluids will remain in a laminar flow state throughout the throttling range, thus providing smooth and continuous response to the control input. The valve opening to the fluid controlled by a stepper motor through a direct drive mechanism. The embodiment shown here employees all PTFE construction for the wetting parts, but any material could be used that would be compatible with the process fluid. Additional features are minimal capture of the process fluid, free draining, and no metallic parts in close communication with the process fluid.

A post-mix beverage valve provides for automatic, accurate beverage ratioing. A valve body can be assembled, and includes a water flow hard body, syrup body and common nozzle body. The water and syrup flow bodies define flow channels and include one end for connection to water and syrup respectively, and opposite ends for fluid connection to the nozzle body. The water flow channel includes a turbine flow sensor connected to a micro-controller determining the water flow rate. The syrup flow channel includes a flow sensor, two MEMS pressure sensors, monitoring the syrup. The sensors are connected to the micro-controller and positioned about an orifice and senses sense a differential pressure indicative of syrup flow rate solenoid regulates flow of syrup through the syrup body. A stepper motor on the water body controls a rod in the flow channel in conjunction with a v-groove.

Presented is a roller shade system that includes a flexible shade material having a lower end, a rotatably supported roller tube that windingly receives the shade material, a stepper motor that operably engages the roller tube to rotate the roller tube to move the lower end of the shade material between a first position and a second position, an optical sensor configured for capturing an image frame of the shade material at linear positions along the shade material as the lower end of the flexible shade material moves from the first position to the second position, and a stepper motor controller configured for controlling the frequency of input pulses to the stepper motor to move the lower end of the flexible shade material from the first position to the second position at a substantially constant linear velocity in response to position information obtained from the plurality of captured image frames.

A low overhead controller for microstepping a stepper motor and a low overhead method for microstepping a stepper motor. The reduction in overhead in system processor is accomplished by the control circuit which dynamically interpolates motor positions between steps commanded from the processor. Also, the reduction in overhead is accomplished by a microstepping method used to effect microstepping resolution control by employing a stored look-up table which gives a resolution value at a given speed according to a predetermined function.

The invention relates to the technical field of optical instruments, in particular to an underwater video camera system based on polarization identification and a method thereof. The technical scheme is that the underwater video camera system comprises an underwater light source, a polarization modulation part and an image acquisition and processing part, wherein the underwater light source comprises a semiconductor laser, an optical filter, a polarizer, a polarization rotator and a beam expander; the polarization modulation part comprises an analyzer, a stepper motor, a stepper motor controller and an infrared detector; and the image acquisition and processing part comprises a high-frequency CCD (Charge Coupled Device) video camera, an image acquisition system and a computer. The underwater video camera system has the benefits that with the adoption of the underwater camera system and the method, the contrast degree and the definition of target imaging as well as the target detectionand the identification efficiency can be effectively improved; the polarization imaging can utilize the differences of different target back polarizations to eliminate the interference of background light; and as a means for identifying the target from messy background is provided, the method has remarkable advantage as compared with the commoner method for imaging and identifying the target by using light intensity.

A system and method are provided for controlling a stepper motor having a rotor and a multi-phase stator. Sinusoidal command signals define a commanded position of the motor's rotor. An actual position of the rotor is sensed as a function of an electrical angle between the actual position and the commanded position. The actual position is defined by sinusoidal position signals. An adjustment signal is generated using the sinusoidal command signals and sinusoidal position signals. The adjustment signal is defined as a function of the cosine of the electrical angle. The adjustment signal is multiplied by each sinusoidal command signal to generate a corresponding set of excitation signals, each of which is applied to a corresponding phase of the multi-phase stator.

The invention relates to a system and a method for measuring residual stress in real time. The method comprises the following steps of: performing three-dimensional surface coordinate reconstruction on a test piece by three-dimensional digital image correlation, performing related research on a speckle image at the periphery of a hole before and after drilling the test piece, and calculating a three-dimensional displacement field before and after drilling; automatically feeding an electric spindle precisely through control over a stepping motor by a stepping motor controller and the translation of a worm gear and worm mechanism according to the drilling depth of the test piece; and calculating the residual stress of the test piece according to planar assumption of a drilling area of a curved surface by combining a theoretical formula for measuring the residual stress during drilling. The system can drill the hole precisely in real time, and measures the residual stress of the test piece with depth change in a stepping mode. The system and the method for measuring the residual stress have the advantages of real-time property, high precision, non-contact, whole-field displacement measurement, flexibility and convenience of operation, and the like.

The invention discloses a multi-sensor-based vehicle-mounted environment recognition system. The system comprises an omni-directional vision module, an IMU module, a GPS module, a radar module and a data fusion module, wherein the omni-directional vision module is used for acquiring environment three-dimensional information in a 360-degree range around a vehicle, the IMU module is used for acquiring accelerated speed and angular speed information of the vehicle, the GPS module and the IMU module jointly work to acquire position and posture information of the vehicle, the radar module is used for acquiring front target position information of the vehicle and has the characteristics of all weather and all time, and the data fusion module is used for fusing environment information acquired by each sensor to more accurately recognize a vehicle driving environment. The invention further discloses an omni-directional vision module, which utilizes each stepping motor to control a corresponding binocular camera to perform a pitching motion in order to acquire omni-directional scene images of an observed environment; and an image processing module is used for in real time collecting and processing scene images acquired by each group of the binocular cameras.

The invention provides an active reflection compensation type single-board wave making device which comprises a computer control and drive system, a mechanical system and a wave measurement and feedback system which are sequentially connected. By adopting an active reflection compensation wave making technology, waves meeting the requirement of test precision are made, and meanwhile, waves reflected from a ship model, an opposite pool wall and a wave absorber can be effectively eliminated; and more than 80 percent of reflection waves are absorbed, thus the condition that the reflection waves strike a wave making mechanism to generate reflection waves once again is avoided so as to effectively improve the wave simulation quality of a pool or a water tank. A servo motor is used as a drive device, and a stepper motor control card and an encoder counting card are adopted to carry out two-position control, thereby the frequency response and the wave making control precision are improved, the drive mechanism is simplified and the maintenance cost is greatly reduced.

A parallel gripper for handling multiwell plates in an automated analysis system, moves individual multiwell plates between a plate storage array unit (i.e., plate hotel) and an imaging station. More particularly, the gripper has two parallel plate-gripping arms that move in equal, but opposite linear directions and are controlled using a stepper motor. Each of the arms has a shelf that provides support for the corresponding side edge of a multiwell plate.

The invention relates to an absolute spectral radiance luminance responsivity calibrating system utilizing a wide tunable laser, which comprises a two-dimensional moving platform, wherein the two-dimensional moving platform is controlled by a computer through a stepping motor control box; a standard detector and a detector to be calibrated are arranged on the two-dimensional moving platform. The absolute spectral radiance luminance responsivity calibrating system also comprises a calibrating light source, wherein the calibrating light source comprises an integrating sphere and a tunable lasersystem; the emitting light of the tunable laser is guided into the integrating sphere and emitted at a light outlet of the integrating sphere to form the calibrating light source; the standard detector and the detector to be calibrated are sequentially aligned to the center of the light outlet of the integrating sphere to detect by the motion of the two-dimensional moving platform; the standard detector calibrates the absolute spectral radiance luminance of the light source of the integrating sphere, and a response signal of the detector to be calibrated is divided by the absolute spectral radiance luminance of the light source of the integrating sphere to obtain the absolute spectral radiance luminance responsivity. The invention can carry out whole machine calibration on a wave band typeradiance luminance detector, the calibrating parameter comprises the absolute spectral radiance luminance responsivity, and the stability and the linearity of the responsivity, and the calibrating precision of the spectral radiance luminance responsivity is effectively improved.

The invention relates to a method for extracting dimensional shape characteristics of profiled fibers; the stepper motor in XYZ direction of an automatic loading table is controlled through a series port to realize the mobile control in horizontal and vertical directions to cause an optical microscope to work in an optimum focusing state. The extracting method comprises the following steps: giving 'cross-sectional samples of the profiled fibers' and 'microscopes for assembling three-dimensional automatic loading table' to judge through 'continuous indirect image acquisition' and 'automatic focusing'; if not, returning to the 'continuous indirect image acquisition'; if yes, going to 'partial image acquisition', then returning to the 'continuous indirect image acquisition' until the partialimage acquisition is ended; going to 'big image splicing'; obtaining 'clear fiber image panoramagram'; carrying out 'image segmentation', 'chain code representation', 'TAR calculation', 'TARN extraction', 'TARP extraction', and 'fiber geometrical shape determination' on the acquired images; and at last, carrying out 'fiber classification and statistics'.

The invention discloses a splicing detection device of a circular Hartmann-Shack wave-front sensor based on a minor caliber. The device is characterized by comprising the Hartmann-Shack wave-front sensor, an x-z 2D electric control translation stage, a step motor controller, a computer, a mirror surface to be detected and a data acquisition card; the Hartmann-Shack wave-front sensor is positioned behind the mirror surface to be detected to detect the mirror surface to be detected, and a facula lattice is formed on the Hartmann-Shack wave-front sensor, and the data acquisition card acquires the facula data and transmits the data to the computer for storing; the computer sends an instruction to the step motor controller, and controls the 2D electric control translation stage to move along an x axis and a z axis to scan and detect the mirror surface to be detected; the data acquisition card sequentially acquires the facula data of a wavelet surface of each frame, and then a wave surface to be detected is obtained by a centroid algorithm, a splicing method and a restoration algorithm. The device and the method help improve a formula by ignoring a defocus error in theoretical analysis, eliminate a principle error of a translation error, improve splicing precision and lower computation complexity of solving splicing parameters.

A single axle bidirectional symmetry stretch testing machine belongs to the experimental mechanics equipment technology field, including: the step-by-steps motor 11, the step-by-steps motor controller, the strength sensor, the wormwheel, the worm, the ball bearing screw mandre, the left nut, the right nut, the linear slideway, the axletree, the base 1, the shaft coupling, the testing sample holding device; the step-by-steps motor connects with the worms by the shaft coupling; the wormwheel cooperates with the worm, the linear slideway and the axletree locates on the base; the strength sensor fixes on the right nut of the ball bearing screw mandrel, spreads the one side of the testing sample holding device, the other side of the testing sample holding device fixes on the left nut. The invention is: uses the machine transmission to improve the transmitting precision; uses the step-by-steps motor to load; the distortion measure can use the step-by-steps motor to compute or uses the non-touch photics displacement measure system.