16results about How to "Reduced control accuracy" patented technology

The invention relates to the field of servo motors, and discloses a motor rotor iron core and a motor cogging torque reduction method and device.The motor rotor iron core of a hemispheroid-like structure is composed of an iron core buckling point structure and a permanent magnet ring, and the outer contour of the bottom of the motor rotor iron core is a circle-like shape formed by connecting a plurality of three-section type geometric lines; the rotor has a unique three-section type rotor core excircle structure. According to the structure, the cogging torque can be reduced, the back electromotive force waveform sinusoidal property of the motor can be improved, the pole-arc coefficient is optimized by changing the circumscribed included angle between the straight line section and the arc section and the eccentric distance between the center of the arc section and the center of the rotor core, and the design target is completed through finite element analogue simulation analysis. Finally, the effects of reducing the cogging torque of the motor, improving the sine property of the back electromotive force waveform and guaranteeing the positioning and control precision of the motor are achieved.

The invention discloses a building body unit capable of expanding and shrinking a space, a building body and equipment, and relates to the technical field of engineering constructions.The building body unit has a shrinking form and an expanding form which can be switched mutually and comprises a reference part, a plurality of first expanding parts and a plurality of second expanding parts; the number of times that the same first expansion piece and the same second expansion piece execute linear movement in the same axial direction or execute rotary movement around the same axial direction is one time. According to the building body unit, the building body and the equipment, each expansion piece is controlled to execute one-time linear movement or rotary movement in the same axial direction, the problem of more interference between the expansion pieces in the three-dimensional space deformation process can be solved, the implementation difficulty and cost of synchronous movement of the same expansion piece are effectively reduced, and the construction efficiency is improved. And the control precision of synchronous movement is improved, so that the deformation difficulty and the deformation cost of the expandable space are greatly reduced, and the feasibility, the stability and the reliability of the expandable space in engineering are improved.

The present invention relates to a cigarette stacking mechanism, including two limit plates, which are vertically arranged and parallel to each other, and mounting carriers are respectively provided on the sides of the lower parts of the two limit plates that are far away from each other; two cigarette supporting plates, which are provided with two cigarette supporting plates, and horizontally pass through the adapted perforations at the same height of the lower parts of the two limit plates, and the two cigarette supporting plates are respectively connected to the mounting carriers on the corresponding sides through elastic telescopic parts; a conveyor line, and the discharging end of the conveyor line horizontally extends to the lower part between the two limit plates; two top plates, which are provided; a lifting mechanism, which is transmission-connected to the two top plates; an extrusion assembly, which is connected to the two elastic telescopic parts, and is used to synchronously squeeze the two elastic telescopic parts during the rising process of the top plate, or to gradually extend the two elastic telescopic parts during the descending process of the top plate. Advantages: It can realize the automatic avoidance of the cigarette supporting plates during the lifting process of the cigarette strips, the linkage between the structures is good, and the control accuracy of the mechanism operation is reduced.

The invention discloses a multi-channel fluid control electromagnetic valve structure, which belongs to the technical field of multi-way electromagnetic valves, and comprises a multi-way electromagnetic valve core, the multi-way electromagnetic valve core is composed of a pilot control sliding plug, a fluid control sliding plug and a fluid control column, and the fluid control column is provided with a fluid control unit used for detecting the movement fluency of the fluid control sliding plug. And impurities at the blocked part are cleaned. The fluid impurity cleaning mechanism carrying the butterfly type cleaning impeller is matched with the sliding plug blockage detection mechanism, when a blockage detection ring is extruded by adhered impurities to contract, a limiting magnetic ring can be driven to contract, control over the sliding plug blockage detection mechanism is relieved, the butterfly type cleaning impeller rotates and transversely moves, and the blockage detection efficiency is improved. The sliding path of the fluid control sliding plug is cleaned in time, internal flowing media are cut and removed through rotation of the butterfly type cleaning impeller, and when impurities are difficult to clean, a warning tone is given out to remind maintenance personnel.

The utility model relates to a transmission for a vehicle, which comprises an input end, an output end and an output end, a first gear ratio; a second gear ratio; a first dynamically controllable clutch operable in an engaged state, a disengaged state, and a one-way clutch state; a second dynamically controllable clutch operable in an engaged state, a disengaged state, and a one-way clutch state; an output terminal; and a controller including instructions stored in a non-transitory memory executable by the controller to adjust a state of the first dynamically controllable clutch and the second dynamically controllable clutch to selectively engage the first gear ratio and the second gear ratio to provide torque transfer from the input to the output of the transmission system.

This invention discloses a dual closed-loop control system and method for rubber mixing pressure in a rubber mixing mill, relating to the field of automation control technology. The system sets a target pressure, monitors the feedback value of the external pressure closed loop, acquires the external pressure closed loop feedback value, calculates a first input value based on the target pressure and the external pressure closed loop feedback value, obtains a first output value based on the deviation between the first input value and a preset first input value threshold, uses the first output result as the input value of the internal pressure closed loop, collects the detected value of the pump inlet pressure, calculates a second input value based on the first output result and the detected pump inlet pressure, adjusts the control pressure of the pump inlet based on the deviation between the second input value and a preset second input value threshold, and controls the speed of the servo motor through a servo controller to stabilize the pump inlet side pressure.

The invention relates to the technical field of power electronics, and discloses a power factor correction method and system for an LED power supply. The method comprises the steps that an analog-digital hybrid control circuit based on a memristor is constructed, and PFC loop parameters are adjusted in real time by means of the non-volatile resistance change characteristic of the analog-digital hybrid control circuit; acquiring running state data and inputting the data into the control processor; optimizing memristor configuration by taking the power factor, the total harmonic distortion rate and the efficiency as fitness functions through a genetic algorithm; dynamically applying a voltage pulse to accurately adjust the resistance value of the memristor; and continuous self-tuning is carried out based on closed-loop feedback. The system comprises a memristor programmable gain amplifier, a sensor, a control processor and a health monitoring module. According to the scheme, hardware-level rapid, fine and self-adaptive PFC parameter regulation and control are realized, and the power factor stability, the system efficiency and the long-term reliability are improved.

The application discloses a mechanical arm path planning and automatic control method, comprising the following steps: installing an inclination sensor on a swing arm, a bucket rod and a rocker position of an excavator respectively, and measuring a bucket relative angle, a bucket rod relative angle and a swing arm relative angle after calibration; establishing a vehicle body reference coordinate system with a swing arm rear hinge point as an origin; establishing a local coordinate system of each degree of freedom according to a right-hand rule, and converting to the vehicle body reference coordinate system; recording Xa coordinates and Za coordinates of a current position of a bucket tooth tip in the vehicle body reference coordinate system, confirming Xb coordinates and Zb coordinates of a target position, obtaining a plurality of intermediate process points after discretization, calculating a control amount through an error solution of the target position and the current position, controlling the movement of each degree of freedom, and realizing the vertical movement of the excavator bucket tooth tip position. The application can control the swing arm lifting, the bucket rod retraction and swing, and the bucket retraction and swing, realize the automatic vertical lifting function of the excavator tooth tip position, and effectively improve the working efficiency of the excavator.

The utility model discloses an ultrasonic beautifying device which comprises a shell, a control circuit, an energy converter for outputting ultrasonic waves, a first moving assembly and a second moving assembly. The control circuit is installed in the shell and electrically connected with the energy converter, the first moving assembly and the second moving assembly. The control circuit is provided with a battery and / or an external power supply; the shell is provided with an opening, and ultrasonic waves output by the energy converter are output opposite to the opening. The first moving assembly is connected with the energy converter to drive the energy converter to move in the first direction. The second moving assembly is connected with the first moving assembly to drive the first moving assembly to move so as to drive the energy converter to move in the second direction. The first direction and the second direction form an included angle. The ultrasonic beautifying device can control the energy converter to move along the first direction and the second direction, so that ultrasonic energy is output in a matrix mode.

The present invention relates to the technical field of grid-connected inverters, and discloses a method for safe inverter startup, comprising the following steps: issuing a startup command to the inverter, closing the first AC relay; measuring the grid-connected point voltage, filter capacitor voltage, and filter inductor current of the inverter, and further processing to obtain the input signal of the current controller; driving the inverter circuit through the output signal of the current controller, so that the filter capacitor voltage enters a voltage following state; and determining whether the inverter enters a normal working mode according to the preset second AC relay closure judgment logic. The present invention solves the problem of excessive inrush current of the grid-connected inverter at startup, avoids the risk of burning the AC relay, thereby ensuring the reliability of the grid-connected inverter connecting to the power grid, and has strong engineering practicality.

A teleoperation robot adaptive position control and force control method and system in a complex scene, acquires multi-source perception data and carries out space-time alignment preprocessing; task state and contact state are identified based on the preprocessed data; when a new task is identified, the control parameters are updated based on the model-independent meta-learning framework and the basic parameters in the meta database and the new task samples; the position control weight and the force control weight are continuously adjusted according to the task and the contact state; the dynamic parameters are identified online, and the load inertia compensation term of the position control loop is updated based on the parameters; the control amount increments output by the position control and the force control are fused according to the weight to generate the final control amount by using a parallel double-loop weighted fusion architecture. The present application avoids the hard switching mutation of position control and force control through continuous weight adjustment, realizes dynamic load inertia compensation through online identification, and combines high-precision positioning and soft contact in a small space, and realizes rapid adaptive migration of multiple maintenance tasks through meta-learning.

The present application relates to the technical field of pipetting workstations, and more particularly to a double-deck rotary disc type pipetting workstation and a method for using the same. The double-deck rotary disc type pipetting workstation comprises an upper disc, a lower disc, a driving mechanism and a pipetting module. The upper disc is arranged above the lower disc. The driving mechanism is in power connection with the upper disc and the lower disc, and can drive the upper disc and the lower disc to rotate. The upper disc is provided with a plurality of consumable boxes for loading pipette tips. The lower disc is provided with a plurality of constant temperature modules, a plurality of magnetic modules for adsorbing magnetic beads, a plurality of mixed well plates and a plurality of liquid storage well plates. The constant temperature modules are provided with constant temperature well plates, and the magnetic modules are provided with magnetic well plates. The pipetting module can move between the upper disc and the lower disc. The pipetting module only moves in the Z-axis direction, and has a lower control difficulty and a lower required control precision, so that the fault tolerance is higher, the reliability is higher, and the pipette tips will not be missed or dropped due to the deviation in the control movement.

This construction machine is provided with: a first hydraulic actuator and a second hydraulic actuator which are driven by a first hydraulic pump and a second hydraulic pump, respectively, and which drive a front working machine; a third hydraulic actuator driven by the second hydraulic pump; a solenoid valve for controlling the hydraulic oil flowing to the second hydraulic actuator; an operation device for operating the front working machine; and a controller that controls the solenoid valve, the first hydraulic pump, and the second hydraulic pump on the basis of the distance between the front working machine and a target construction surface and an operation signal, the controller being configured to control the solenoid valve, the first hydraulic pump, and the second hydraulic pump on the basis of the flow rate difference between the maximum read flow rate of the second hydraulic pump and the flow rate supplied to the third hydraulic actuator. And a controller configured to calculate an upper limit speed of the second hydraulic actuator, limit a required speed of the second hydraulic actuator according to the operation signal by the upper limit speed, calculate a target flow rate of the second hydraulic pump, and control the solenoid valve and the second hydraulic pump according to the target speed.

The application provides a cooking utensil control method and control system, aiming at solving the problem that the cooking utensil in the prior art has a single reference measured temperature object when controlling the heating power of a heater, it is difficult to accurately judge the whole food heating environment, and the cooking effect is poor. The cooking utensil control method provided by the application collects four actual temperatures of a liner cavity, a liner side wall, a liner heated area and a food rack; compares the actual temperature of the liner cavity with the same time temperature of the stored liner cavity temperature change curve of the food to be cooked in real time; and controls the heating power of the heater by referring to the temperature change curves corresponding to the liner cavity, the liner side wall, the liner heated area and the food rack. By storing the temperature change curves of the four objects with the cooked food, the temperatures of the four objects are heated according to the stored temperature change curves during the heating process, and the stability of the food heating is ensured.

This invention discloses a control method and a control device. The control method includes: entering a first execution gear stage and determining a first target gear at this stage; acquiring execution information of the previous first target gear, including target position, drive duty cycle, and actual position; if the first position difference between the preset optimal position of the first target gear in the first execution gear stage and the actual position of the previous first target gear exceeds a first execution gear threshold, correcting the target position or drive duty cycle of the current first target gear; the previous first target gear and the current first target gear are in different first execution gear stages. In this invention, when the gear shifting control accuracy of the previous gear shifting operation is low, the control accuracy of the current gear shifting operation can be improved by correcting the target position or drive duty cycle of the current first target gear, thereby increasing the success rate and accuracy of gear shifting and ensuring the driver's driving experience.

The embodiment of the utility model discloses a cleaning robot and a laser radar, the laser radar comprises a receiving mirror, a receiving and transmitting assembly, an emitter and a circuit, in the using process, the emitter emits laser, the laser is projected on an object and can be reflected, and the reflected laser passes through the receiving mirror and then is fed back to the receiving and transmitting assembly; based on the laser radar, the distance of the object can be determined based on the emitted laser and the received laser. According to the laser radar provided by the embodiment of the invention, the transmitter is independently arranged, the transmitter and the receiving and transmitting assembly are separately arranged, one end of the line is connected to the transmitter, and the other end of the line is connected to the receiving and transmitting assembly, so that the width of the line can be greatly reduced, and only the line can shield the light path of the receiving mirror; the shielding area of the receiving mirror is reduced, the ranging precision is improved, and the size of the laser radar is reduced.