240results about How to "Eliminate errors" patented technology

The invention relates to the technical field of hydrological monitoring, and discloses a regional groundwater reserve change dynamic monitoring method based on gravity satellite time series data analysis. According to the method, the multi-source data scale effect and observation noise are effectively eliminated, the physical reliability and resolution of groundwater signal extraction are improved, and the recognition precision and early warning perspectiveness of the abnormal loss trend are enhanced. A full-chain monitoring closed loop of multi-source satellite observation, high-precision physical inversion and dynamic statistical benchmark is constructed, multi-dimensional environment data is aligned, a component separation strategy based on multi-element physical mechanism constraint is established based on a water balance principle, and anomaly diagnosis is performed in combination with a self-adaptively updated long-time-sequence historical database.

The present application belongs to the technical field of vehicle mass online estimation, in particular to a vehicle mass online estimation method based on fuzzy logic and weighted least square method, comprising the following steps: 1) obtaining longitudinal acceleration sensor measurement value signal, longitudinal speed signal, engine output torque signal, gear signal, throttle opening signal, brake pedal signal and steering wheel angle signal from vehicle CAN bus; 2) correcting the measurement value of longitudinal acceleration sensor; 3) calculating equivalent driving force and equivalent acceleration; 4) calculating working condition fitness degree by using fuzzy logic algorithm; 5) estimating vehicle mass by using weighted least square method; and 6) suspending and starting vehicle mass estimation. The structure is reasonable, and the accuracy and working condition adaptability of vehicle mass online estimation can be improved during use.

The invention relates to the technical field of microfluidics, in particular to a carbon quantum dot hydrothermal synthesis system and method based on microfluidics thermal field equilibrium, which comprises a thermal field sensing module, an equilibrium analysis module, a thermal field coupling module, an equilibrium regulation and control module and a closed loop execution module, the thermal field sensing module is used for collecting array temperature on the surface of the micro-fluidic chip and fluid pressure data in a flow channel, and reconstructing three-dimensional temperature distribution in the micro-channel through a multi-physics field coupling algorithm to obtain a real-time thermal field state matrix. According to the invention, by constructing a multi-physical field coupling algorithm of a thermocouple array-flow resistance model-conjugate heat transfer equation, the three-dimensional temperature distribution of the fluid in the micro-channel can be inverted and reconstructed by using surface temperature and pressure data, so that a control system can pass through a chip matrix, and the temperature of the fluid in the micro-channel can be controlled. The radial temperature gradient and the axial thermal distortion in the fluid are directly sensed, the hysteresis and the error of sensor measurement are eliminated, and a real physical basis is provided for accurate temperature control.

The invention relates to a method for evaluating distribution uniformity of silicon in a CVD (chemical vapor deposition) silicon-carbon composite material. The method comprises the following steps: (S1) acquiring a scanning electron microscope backscattered electron image and a silicon element surface distribution diagram of a sample; (S2) carrying out binarization processing on the silicon element surface distribution diagram through image analysis software, and counting the area proportion sigma Si of the deposited silicon particles; (S3) combining the carbon mass fraction c% of the sample and the correction coefficient delta, and calculating the mass fraction w% of undeposited silicon particles; the correction coefficient delta is obtained through calibration: under the same imaging condition, selecting a region in which all particles are completely covered by a silicon signal and the number of complete particles is not less than 50 from a silicon element surface distribution diagram as a'complete silicon deposition region '; and carrying out the same binarization processing on the silicon particles, wherein the area ratio sigma Si0 of the silicon particles is a correction coefficient delta. The evaluation method provided by the invention has high accuracy, wide applicability and excellent measurement repeatability, and is a scientific and reliable quantitative analysis means.

The invention relates to the technical field of straightening equipment, and discloses an automatic matching straightening machine for shaft workpieces, which comprises a machine body, a plurality of linear sliding rails for a plurality of mechanisms to linearly move are arranged on the machine body, and strip-shaped tooth grooves matched with moving gears are formed in the two sides of the interior of the machine body; one side of the machine body is provided with a PLC (Programmable Logic Controller) control cabinet for calculating input shaft workpiece data information and generating a control signal, and the PLC control cabinet is used for controlling each mechanism on the machine body in an operation process. By adding and arranging the movable detection mechanism, when the shaft workpiece is straightened, the movable detection mechanism adopts a lever type detection structure, can be tightly attached to the surface of the shaft workpiece, sensitively captures bending deformation information of the workpiece, realizes accurate acquisition of deformation, avoids subjectivity and errors of manual detection, and improves the straightening accuracy of the shaft workpiece. And full-length movement detection can be realized along a linear sliding rail, all parts of the shaft workpiece are covered, and the condition of missing detection of a deformation position is avoided.

The utility model relates to the technical field of brake performance detection of elevator brakes, and discloses a brake wheel and brake shoe gap measuring device of an elevator drum brake, which comprises a shell, a fixing mechanism comprises two measuring bases, one sides, far away from each other, of the two measuring bases are fixedly connected with a guide shaft, and the guide shaft is fixedly connected with the shell. An S-pole magnet is fixedly connected to the interior of the guide shaft, a mounting shaft is slidably connected to the interior of the guide shaft, and an N-pole magnet is fixedly connected to the exterior of the mounting shaft. According to the utility model, the bottom of the mounting shaft is aligned with the interior of the guide shaft, then the mounting shaft is inserted into the interior of the guide shaft, and the plurality of L-shaped grabbing teeth are pushed to rotate in the insertion process of the mounting shaft, so that the mounting shaft is fixed in the insertion process; and the N-pole magnet fixed at the bottom of the mounting shaft is matched with the S-pole magnet in the guide shaft, so that the stability of the measuring mechanism in the measuring process is further ensured, and the measuring effect is improved.

The application provides a multi-excitation vibrator vibration test control method, device, terminal and medium, the method comprises the following steps: obtaining a multi-channel white noise signal and a multi-channel output signal, and obtaining an adaptive inverse matrix according to the multi-channel white noise signal and the multi-channel output signal; the driving signal of the current frame is applied to the test piece through the excitation vibrator, and the test piece response signal is obtained; the dynamic target phase is obtained according to the test piece response signal; the driving signal of the next frame is obtained according to the dynamic target phase, the test piece response signal, the driving signal of the current frame and the adaptive inverse matrix, and the test piece is controlled according to the driving signal of the next frame through the excitation vibrator, and the test piece response signal of the next frame is obtained. The inter-channel antagonistic effect is eliminated, the error is efficiently eliminated, the number of iterations required to reach the target spectrum tolerance band is shortened, and the control convergence speed is improved.

The invention particularly relates to a three-dimensional C arm and optical navigation fused spine screw placement path planning system, and relates to the technical field of intelligent medical treatment and surgical navigation. According to the system, a first coordinate set of coding characteristics in a C-arm image and a second coordinate set of optical navigation tracking are synchronously obtained through a reference device installed on a cone; respectively constructing a spatial topology network based on the image and the navigation coordinate system, and automatically establishing a mapping relation between the image and the navigation coordinate system by using an image matching algorithm to realize fusion registration; the planned path is converted to be stored in a dynamic coordinate system with the device as the reference; during operation, the dynamic coordinate system pose is tracked and solved in real time, and a path is mapped and displayed to guide instrument operation. According to the method, automatic and robust registration without manual marking is realized, and registration failure caused by movement of a patient in an operation is avoided through binding of a path and a dynamic coordinate system.

A modulation depth precise evaluation method for a fiber-optic gyroscope light path noise reduction technology is characterized in that a precise matching model of a light intensity signal of a main light path and a light intensity signal of a reference light path is established by using a fiber-optic gyroscope detector signal, so that precise evaluation of the optimal modulation depth of the fiber-optic gyroscope light path noise reduction technology is realized, and the determination of the optimal state of a gyroscope is efficiently completed. Meanwhile, the voltage signal is used for replacing the optical power signal to achieve evaluation of the optimal modulation depth, the influence of optical power measurement errors can be avoided, and accurate control independent of optical path fusion point loss or accurate matching of optical device parameters is achieved.

The invention discloses an inland river electric ship intelligent navigation and energy management integrated control system and method. The system comprises a perception and communication layer, a central decision and calculation layer and an execution and energy layer. The sensing layer obtains multi-source information, including surrounding ship AIS, ship positioning and ground speed, external real-time water flow, ship lock scheduling, channel static geography and actually measured water flow information. The central decision-making layer comprises a data fusion and water flow compensation module which aligns information and solves the real-time water speed through vector fusion; the sailing resistance prediction module is used for predicting future resistance based on the water speed and the geometric information of the navigation channel; and the energy management predictive control module is used for generating an optimal power distribution instruction through rolling optimization based on the water speed and the predictive resistance. The execution layer comprises a composite power supply and an electric propulsion system and is used for executing instructions. Integrated control is achieved through AIS enhanced sensing and water flow compensation, and the accuracy, safety and economical efficiency of ship control are improved.

A cable truss, including upper chord cable, lower chord cable, cable clamp, cable clamp support arm, cable end connecting block; the two ends of the cable clamp support arm are respectively provided with a cable clamp, the cable clamp is a cylindrical structure as a whole, which is composed of upper spiral body, middle spiral body and lower spiral body, the joint of the upper spiral body and the middle spiral body is provided with an upper chord cable through hole, and the joint of the middle spiral body and the lower spiral body is provided with a lower chord cable through hole; a plurality of telescopic locking pin shafts are arranged in the upper spiral body and the lower spiral body in the vertical direction, the middle spiral body is provided with locking pin shaft insertion holes corresponding to the locking pin shafts, and the locking pin shafts are inserted and matched with the locking pin shaft insertion holes. The application solves the design problem of the cable net node, reduces the adverse effect of the unbalanced force between the cable nets on the overall structure, increases the force rationality of the node and the safety of the whole cable net, reduces the processing and manufacturing cost and the construction difficulty, and can be applied to the "sky round place" structure of the "Dream of Red Mansions" drama fantasy garden engineering.

The application discloses a kind of multi-functional gas component concentration monitoring sensors in tunnel and use method, belong to road construction technical field.The application includes white laser emitter, 90° prism, beam splitter, dust cleaner, dispersion prism, 180° prism, dispersion light intensity detector, phase interference range finding device, data processing and sending device and guide rail.The application solves the problem that the function of the existing monitoring sensor in tunnel is single, and the cost is higher and the monitoring efficiency is lower by relying on multiple single-function sensors for monitoring;The application significantly improves the monitoring accuracy of the concentration of various gas components by full-spectrum coverage and double-data comparison to average, breaks through the limitations of traditional single-function sensors, without multiple sensor devices in parallel, significantly reduces the overall operating cost, improves monitoring efficiency.

The utility model relates to detection device technical field, and disclose a kind of tapered roller diameter detection device, including detection platform, the upper end middle place of detection platform is provided with circular table, the upper end fixedly connected with fixed frame of circular table, the left and right ends middle place of fixed frame is evenly provided with lifting groove one, the inside sliding installation of lifting groove one has pressing plate, the outside sliding installation of pressing plate has two groups of measuring block, the upper end middle place of circular table is fixedly installed with inner taper hole seat, the left and right ends of fixed frame are evenly provided with lifting groove two at the downside of lifting groove one, the inside sliding installation of lifting groove two has measuring plate. The device can ensure that tapered roller keeps in the middle and perpendicular state during measurement, so as to eliminate the error caused by measuring point skew, and also can measure the diameter data of multiple cross sections of tapered roller, to provide more comprehensive detection results, improve processing quality.

This utility model discloses a high-precision horizontal rotary table, relating to the field of precision machining equipment technology, comprising: a housing, a spindle core, a front bearing assembly, a rear bearing assembly, a sleeve, a worktable, a brake, a motor rotor-stator assembly, and an angle encoder; the spindle core is fixed to the housing via the front and rear bearing assemblies, the front bearing assembly having a transition fit with the spindle core and being fixed by end face screws, the outer ring of the front bearing assembly having a transition fit with the housing and being fixed by end face screws; the rear bearing assembly having a transition fit with the spindle core, and the bearing sleeve having a clearance fit with the housing; the worktable is fixed to the front end face of the spindle core, the brake is fixedly mounted on the housing, the output end of the motor rotor-stator assembly is connected to the spindle core, and the angle encoder is mounted on the sleeve; in the technical solution provided by this utility model, by using cylindrical roller rotary table bearings or thrust angular contact ball rotary table bearings in the front bearing assembly and having a transition fit with the spindle core and housing, the axial load-bearing capacity is significantly improved.

The application provides a three-axle tractor slip ratio error elimination method, device and electronic equipment, which comprises the following steps: determining the tractive force and slip ratio of different tractive force sample points of the three-axle tractor; dividing the different tractive force sample points of the three-axle tractor into multiple regions based on the tractive force of the different tractive force sample points of the three-axle tractor; determining the tractive force average value and slip ratio average value of the tractive force sample points in each region based on the tractive force and slip ratio of the different tractive force sample points of the three-axle tractor; fitting the tractive force average value and slip ratio average value based on the weighted least square method, determining the slip ratio error caused by the rolling radius of the three-axle tractor based on the fitting result, and correcting the rolling radius based on the slip ratio error to eliminate the slip ratio error. The application can eliminate the slip ratio calculation error of the three-axle tractor without increasing the hardware cost, and the calculated slip ratio is more accurate.

The present application relates to the technical field of hydraulic engineering and river dynamics, and discloses a bed sand gradation file splicing method and device, an electronic device and a storage medium, the method comprising: determining a region to be studied, dividing the region to be studied into a plurality of grids, and layering the grids according to a preset step size downward along the ground surface to obtain a plurality of regional nodes; acquiring bed sand gradation data collected at different depths in different geomorphic regions in the region to be studied; mixing the bed sand gradation data of different depths in different geomorphic regions according to the preset step size to obtain bed sand gradation data of different layers in different geomorphic regions; and matching bed sand gradation data for each regional node according to the type of the geomorphic region corresponding to each regional node and the layer in which each regional node is located to obtain a bed sand gradation file for the region to be studied. The present application splices bed sand gradation files of different geomorphic types, thereby quickly generating a complete bed sand gradation file suitable for a two-dimensional water and sediment model.

The utility model provides a kind of adjustable shock-absorbing pedestal for axial flow fan, including two interval and mirror image symmetry setting fixture plate, two the fixture plate vertical setting, adjustable assembly is connected in the upper portion of two the fixture plate, two the fixture plate is moved under the driving of adjustable assembly Face or mutually diverging;Two the fixture plate is respectively connected with the flange of the both ends of axial flow fan.The utility model provides a kind of adjustable shock-absorbing pedestal for axial flow fan, can effectively control fan pedestal length, so that the error caused by equipment ontology manufacturing or pedestal manufacturing can be reduced, so that the situation that pedestal cannot match fan.

The utility model discloses a double motor anti-backlash indexing turn-milling composite spindle device relates to horizontal turn-milling composite machining center machine tool spindle field, include: spindle, rotation setting in the spindle box body, and one end of spindle is used for with spindle motor drive connection, two C axle assemblies are set up on the spindle box body, and C axle assembly includes C axle slip gear and servo motor, and the translation direction of C axle slip gear is parallel with the axial direction of spindle, and servo motor passes through C axle spline shaft and C axle slip gear slip connection, hydraulic combination oil cylinder sets up on the spindle box body, and hydraulic combination oil cylinder includes the right end piston rod of telescopic movement, and right end piston rod is connected with two C axle slip gear through the yoke, when right end piston rod telescopic movement, yoke drives C axle slip gear and the meshing or disengaging of main shaft gear on spindle, this device meets high accuracy, high rigidity, high reliability, still has compact structure, easy installation and so on.

The present application relates to the technical field of ecological protection, and more particularly to a forest water conservation capacity remote sensing inversion method suitable for Nanling cloudy and rainy areas, aiming at the problem that the existing inversion method cannot overcome the cloud cover and terrain influence, and the precision of forest water conservation capacity is low, the present application obtains optical and microwave remote sensing data, pre-processes the optical and microwave remote sensing data, extracts corresponding optical characteristics and microwave characteristics, weights and fuses the optical characteristics and microwave characteristics, calculates the forest water conservation amount by using a water conservation amount physical model, and generates a Nanling forest water conservation capacity spatial distribution map. The method overcomes the errors caused by weather, terrain shadow and distortion, constitutes a full-weather, high-precision, Nanling special environment-adapted forest water conservation capacity remote sensing inversion system, and realizes accurate quantification of the water conservation capacity of the Nanling special forest ecosystem.

This utility model relates to the field of forklift technology and discloses an assembly and positioning fixture for a forklift tail carriage assembly. It includes a base, on which a slit positioning assembly is fixed. The slit positioning assembly includes a positioning bracket and horizontally arranged, mutually perpendicular transverse slit positioning blocks and longitudinal slit positioning blocks. The end of the transverse slit positioning block furthest from the positioning bracket is an abutment end, used to abut against the side plate of the tail carriage assembly. The end of the longitudinal slit positioning block furthest from the positioning bracket is also an abutment end, abutting against the front or rear plate of the tail carriage assembly. A steering axle positioning assembly is fixed to one side of the base. The steering axle positioning assembly includes a steering axle positioning bracket and a positioning pin. The axis of the positioning pin is collinear with the axis of the steering axle mounting hole on the tail carriage assembly. This utility model, through the coordinated operation of the slit positioning assembly and the steering axle positioning assembly, quickly and accurately positions and fixes the various plates of the tail carriage assembly, ensuring the coaxiality of the slit dimensions and the steering axle mounting holes.

The present application relates to a kind of industrial robot vision image recognition method and system based on deep learning, 1, by constructing bright value, dark value two light field, different paint under different light field variation can be generated training model, so that different paint color under different light field can be presented with the change of color;2, by the information of industrial product in advance input can build input variable, eliminate the error of presented color caused by industrial product parameter;3, use the same paint in dry and wet state under the different presented color of construction model, by image recognition completes the judgment of paint dry;4, build dry judgment model and color gamut deviation model with self-learning ability complete the judgment of entire industrial product, can be based on color range different according to the degree of change of paint color before and after drying to complete the judgment of industrial product dry state, while it can avoid the situation that judgment cannot be carried out due to too small color change of paint on industrial product.

This application discloses a timing method, electronic device, storage medium, and program product, relating to the field of aircraft technology. The timing method includes: acquiring a mass value monitored by a gravity sensing module; determining the control team to which the aircraft belongs via a circuit board when the duration of a first target detected exceeds a preset hysteresis time, and controlling a timer to start timing; determining the landing time of the control team to which the aircraft belongs based on the timer's duration data, wherein the duration of the first target is the duration of a mass value greater than or equal to a preset threshold; and stopping the timer when the duration of a second target detected exceeds the hysteresis time, wherein the duration of the second target is the duration of a mass value less than a preset threshold. This application improves the timing accuracy of aircraft racing by achieving automatic and accurate detection of the aircraft's landing status and full automation of timing.

This application relates to the technical field of lifting machinery, specifically to hydraulic cylinder systems, lifting booms, and cranes. The hydraulic cylinder system includes a first cylinder, a second cylinder, and hydraulic supply pipes. The hydraulic supply pipes are connected to both the first and second cylinders. When the hydraulic supply pipes are in a first state, they guide hydraulic oil to drive the first cylinder. When the hydraulic supply pipes are in a second state, they guide hydraulic oil to drive the second cylinder. When the hydraulic supply pipes are in a third state, they guide hydraulic oil to drive the first and second cylinders to move synchronously. Thus, when synchronous operation of the two cylinders is required, the hydraulic supply pipes are controlled to be in the third state, guiding hydraulic oil to drive the first and second cylinders to move synchronously. If an error occurs in the synchronization of the first and second cylinders, the hydraulic supply pipes are switched to the first or second state, controlling the first or second cylinder to move independently, thereby eliminating errors in the synchronization process and improving synchronization.

The invention discloses a wafer carrier layer height automatic calibration method and a related device, and the method comprises the steps: moving a wafer carrier, and enabling a dual-path cooperative photoelectric sensor to be capable of detecting a metal support ring of a current wafer at the same time; a wafer carrier is moved, the lower boundary position P1 and the upper boundary position P2 of a metal supporting ring of a current wafer are recognized based on a double-path cooperative photoelectric sensor, the wafer carrier is divided into a plurality of layers, and wafers are arranged in all the layers; the middle position Pm of the metal supporting ring is determined based on the lower boundary position P1 and the upper boundary position P2 of the metal supporting ring, and the middle position Pm of the metal supporting ring serves as the calibration position of the height of the wafer carrier layer where the current wafer is located. And the method has the characteristics of small error and high efficiency.

The utility model belongs to high temperature friction coefficient test technical field especially for a kind of low-speed high-temperature environment with lubricating material friction coefficient testing device, including casing, bottom plate and base, casing is set in bottom plate upper portion, base is set in bottom plate lower portion;The top surface of bottom plate is respectively provided with horizontal key and vertical key, and force measurement driving assembly is also provided on the bottom surface of bottom plate;Supporting seat is provided on the mounting hole corresponding to horizontal key;The rear end of supporting seat is provided with motor base, and coupling is provided in the middle part of motor base;The end of coupling is connected with servo motor;The front end of supporting seat is provided with bearing, and supporting shaft is provided in the lower part of bearing;The front end of supporting shaft is also provided with test shaft;The front end of test shaft is provided with test assembly.The utility model can realize the standardization measurement of finished lubricating material sliding friction coefficient under low-speed high-temperature environment, solve the problem that traditional method cannot quantize test data.

The application discloses a laser ranging four-roller micro-foaming calender and a calendering method thereof, and belongs to the technical field of plastic foamed plate processing equipment. The calender comprises a four-roller calendering unit, a laser ranging unit, a servo adjusting unit and a control system. The plate thickness is detected in a non-contact real-time mode by a laser triangulation ranging sensor, and the servo motor is linked with the PLC control system to realize closed-loop dynamic adjustment of the roll gap. The calendering method adopts multi-channel symmetrical calendering of the upper roller group and the lower roller group and gradient temperature control, so that the plate sequentially completes surface skinning, internal foaming and thickness setting calendering, and the thickness uniformity and the surface quality are effectively improved.

The invention discloses a gene detection sample oscillation mixing device capable of accurately controlling the speed, and relates to the technical field of gene sample detection, the gene detection sample oscillation mixing device comprises a device host and a driving member, and is characterized in that the driving member is vertically embedded in the device host, and the top power output end of the driving member is horizontally connected with a rotating frame member. According to the gene detection sample oscillation mixing device capable of accurately controlling the speed, the oscillation frequency and amplitude can be accurately controlled according to preset parameters through a high-precision speed sensor and an intelligent regulation and control system which are arranged in the device host. And the driving component adopts an advanced motor driving technology, so that the stability and high efficiency of power output are ensured. And the rotating frame component is designed into an adjustable structure and can be flexibly adjusted according to the sizes of different sample containers, so that the uniformity of oscillation mixing is ensured. And the clamping component is made of a soft and elastic material, so that the sample container can be firmly clamped, and the damage to the sample in the oscillation process can be avoided.

A kind of strapdown inertial navigation attitude algorithm precision evaluation method, according to the required carrier dynamic environment setting polynomial coefficient;According to polynomial offline calculation all the attitude true value of required reference time;According to the attitude true value, deduce angular velocity analytical expression, generate gyro observation;Gyro observation is regarded as the input of the evaluated strapdown inertial navigation attitude algorithm, and the carrier attitude parameter is updated, to obtain the attitude solution result;After each attitude algorithm solution, the algorithm performance is quantitatively evaluated;After each algorithm performance evaluation, the parameters of attitude trajectory model, coefficient matrix are adjusted or the current evaluation data is saved;The adjusted model parameters or evaluation data are saved, when new high-order attitude algorithm needs to be verified or further extended maneuvering scene, the initial step is entered and recursive iteration is sequentially carried out until the evaluation task is completed.The present application can consider large-angle maneuvering scene simulation and attitude / angular velocity analytical true value acquisition, and more accurately and efficiently verify high-order attitude algorithm performance.

This utility model discloses a precision embedded fully enclosed linear module, including a base plate. Two side plates are welded to the upper end of the base plate. Steel plates are welded to both sides of the two side plates, and the two steel plates are welded to the base plate. Guide grooves are provided on adjacent sides of the two side plates. A moving block is slidably connected between the two side plates. Protruding portions are provided on both the front and rear sides of the moving block, and these protruding portions are slidably connected to the two guide grooves. A placement platform is fixedly connected to the upper end of the moving block, and a through channel is provided within the placement platform. This utility model's linear module is completely enclosed from the machining workshop, thus preventing dust and other debris from adhering to the surface of the transmission components and reducing accuracy. It also prevents debris generated during the operation of the transmission components from entering the machining workshop and can collect debris generated by transmission wear, ensuring transmission accuracy.

The application provides a pressing positioning device for a motor stator, and relates to the technical field of stator processing, which comprises a base and a circumferential positioning device installed on the base; a shell positioning groove for positioning a motor shell is formed in the base; the circumferential positioning device comprises a horizontally movable positioning block, the positioning block is used for cooperating with a vertical positioning groove on the circumference of a stator core and circumferentially positioning the stator core; a positioning opening for accommodating the positioning block to enter and exit is arranged on the side of the motor shell facing the positioning block; the circumferential positioning device further comprises a driving and locking mechanism for driving the positioning block to horizontally move and be locked. The application can improve the pressing precision and consistency of the motor by circumferentially positioning the stator core during the pressing process of the stator core.