14 results about "Internal feedback" patented technology

An internal feedback hydrostatic bearing and a hydrostatic spindle structure relate to the field of bearing design. The problems that according to an existing hydrostatic bearing, hydraulic oil in an oil inlet cavity and an oil collecting cavity still easily enters a bearing oil cavity on the side, and consequently the rotating precision of a main shaft borne by the hydrostatic bearing is insufficient and unstable are solved. N pairs of throttlers are arranged, and the two throttlers in each pair are arranged on the two sides of the radial direction and / or the two sides of the axial direction of the main shaft correspondingly; each throttler comprises an oil inlet groove, an oil collecting groove and a bearing oil groove, the oil collecting groove surrounds the oil inlet groove, two opposite groove edges of the oil inlet groove are oil sealing edges, the other two opposite groove edges of the oil inlet groove are throttling edges, the throttling edges are configured to be gap throttling openings, and pressure oil in the oil inlet groove can be pressed into the oil collecting groove from the gap throttling openings; the peripheral groove edges of the oil collecting groove and the bearing oil groove are oil sealing edges, the oil collecting groove is communicated with the bearing oil groove of the other throttler, and pressure oil in the oil collecting groove is pressed into the bearing oil groove of the other throttler to achieve internal feedback.

The invention discloses a planetary speed reduction joint module, and belongs to the technical field of joint modules and robots, the planetary speed reduction joint module comprises a shell, a driving assembly, an output assembly and a planetary speed reducer, the driving assembly comprises a frameless torque motor, and an input end magnet used for feeding back the position of an input end is installed on a rotor of the frameless torque motor; the output assembly comprises an output flange and an output feedback shaft, the output flange is driven by the planetary reducer to rotate, a sun gear of the planetary reducer is provided with a channel extending along the axis of the sun gear and used for allowing the output feedback shaft to penetrate through, and one end of the output feedback shaft is coaxially connected with the output flange. The other end penetrates through the sun gear of the planetary reducer through the channel and then is provided with an output end magnet for feeding back the position of the output end; the output feedback shaft fixedly connected to the output flange is used for feeding back the position of the output end in the joint module in a mechanical mode, periodic calibration or accumulated errors, thermal drift and the like of the multi-stage magnetic ring at the input end are compensated, and simple and reliable high-precision closed-loop control is formed.

A Delta-sigma (delta-sigma) device comprises a transducer (2) and a delta-sigma modulator (3), where the transducer (2) comprises: a sensing stage (100) for detecting a property of an environment (106) and an interface stage (101), where the sensing stage (100) is configured to detect the property of the environment (106); and the delta-sigma modulator (3) comprises: an input stage, a feed-forward low-pass filtering stage (102), an analog-to-digital encoder (104), an unfiltered in-modulator feedback path and a low-pass filtered in-modulator feedback path; wherein the input stage is connected to the interface stage (101) and comprises two subtraction stages (113, 114) of the input stage for receiving an unfiltered in-modulator feedback signal (109) and a low-pass filtered in-modulator feedback signal (110) and subtracting the unfiltered in-modulator feedback signal (109) and the low-pass filtered in-modulator feedback signal (110) from the sum of the one or more input converted signals (108), to obtain a delta error signal (111); the analog-to-digital encoder (104) converts the filtered delta error signal into a digital output signal dout (t) (112); the feedback path in the unfiltered modulator converts the dout (t) (112) into a feedback signal (109) in the unfiltered modulator; the low-pass filtering modulator internal feedback path converts the dout (t) (112) into a low-pass filtering modulator internal feedback signal (110).

Example embodiments relate to machine learning based power amplifier digital predistortion. A device can utilize a power amplifier to amplify and transmit a signal. The signal can be received by an internal feedback receiver of the device. The device can further include a first machine learning model configured to emulate an external feedback receiver and generate an emulated feedback signal based on the internal feedback signal. The device can further include a second machine learning model configured to determine a digital predistortion parameter for the power amplifier based on the emulated feedback signal. Apparatuses, methods, and computer programs are disclosed.

The application relates to the technical field of industrial safety control, and discloses a double-hand button synchronous interlocking safety control module and a control method. The module comprises two input channels, a cross fault detection circuit, a synchronism detection circuit, a redundant output unit and an internal feedback monitoring circuit. The cross fault detection circuit continuously monitors the electrical isolation state between the channels during operation, and disconnects the output when an abnormality is found. The synchronism detection circuit measures the time difference when the two input signals become valid, and only allows the output when the time difference is not greater than a preset synchronization time window. The redundant output unit is composed of at least two series-connected forced direction switching elements, and cooperates with the feedback monitoring to ensure that the safety circuit can still be cut off under single-point fault. The application improves the safety and reliability and the response speed through real-time channel isolation monitoring, pure hardware synchronization judgment and redundant output fault-tolerant design, meets the requirements of high safety integrity level, and is suitable for safety application scenarios of various double-hand button control.

This application relates to a real-time active sound synthesis method for electric vehicles based on vehicle dynamics parameters. The method involves real-time acquisition of motor speed, vehicle speed, throttle position, and torque; dynamic mapping and calculation of carrier frequency, modulation frequency, and modulation index; real-time generation of audio waveforms using a frequency modulation synthesis algorithm; and outputting external warning signals and internal feedback signals after spatial rendering. This method enables real-time changes in timbre based on driving operations, enhancing realism and safety, while reducing hardware costs.

The present invention provides a multi-channel superconducting quantum interference device measurement system and a non-destructive crosstalk calibration method. 1) Adjust the multi-channel superconducting quantum interference device measurement system to an external feedback mode, respectively calibrate the channel crosstalk coefficients caused by the pickup coil and the external feedback coil, and eliminate the crosstalk of the external feedback mode by means of physical deduction based on the channel crosstalk coefficient caused by the external feedback coil; 2) Adjust the multi-channel superconducting quantum interference device measurement system to an internal feedback mode, calibrate the channel crosstalk coefficient caused by the internal feedback coil, and eliminate the crosstalk of the internal feedback mode by means of physical deduction based on the channel crosstalk coefficients caused by the pickup coil and the internal feedback coil. The present invention realizes non-destructive calibration and elimination of crosstalk in a multi-channel SQUID measurement system integrating a Pickup coil, and has high precision; the present invention is simple to implement, easy to operate, and suitable for applications in high-precision magnetic measurement fields based on SQUID such as super navigation magnetism.

The utility model relates to the technical field of machine tools, in particular to an internal feedback rotary table for a machine tool, which comprises a rotary table seat, a hydrostatic bearing fixed in the rotary table seat, a lower sealing cover fixed at the bottom of the rotary table seat, and a rotating shaft rotationally connected in the hydrostatic bearing and penetrating through the lower sealing cover, an upper step part and a lower step part are formed on the rotating shaft located at the two ends of the hydrostatic bearing, a thrust ring which axially supports the hydrostatic bearing together with the upper step part is fixed to the lower step part, and an upper groove and a lower groove which are distributed in an up-down staggered mode are formed in the upper end face and the lower end face of the hydrostatic bearing in the circumferential direction. An upper boss and a lower boss are formed in the upper groove and the lower groove, and a first throttling oil channel and a first oil inlet channel are formed in the upper boss and the lower boss; a side groove is formed in the inner side of the hydrostatic bearing in the circumferential direction, a side boss is formed in the side groove, and a second throttling oil channel and a second oil inlet channel are formed in the side boss. The utility model has the advantages of compact structure, strong bearing capacity, high rotation precision and long service life.

This invention discloses a two-dimensional electrostatic scanning micromirror, comprising an outer frame, an inner frame, and a mirror surface. The outer frame is machined with an outer frame isolation groove, dividing it into an outer frame measurement section, an outer frame driving section, and two outer frame connecting sections. An external feedback comb group is located between the outer frame measurement section and the inner frame, and an external driving comb group is located between the outer frame driving section and the inner frame. The mirror surface is machined with a mirror surface isolation groove, dividing it into a mirror surface feedback section, a mirror surface driving section, and a central section. An internal feedback comb group and an internal driving comb group are machined between the mirror surface feedback section and the inner frame, respectively. By setting isolation grooves with different structures on the outer frame and the mirror surface, the outer frame and the mirror surface are separated into different functional parts. The inner and outer comb groups are respectively set as driving comb groups and feedback comb groups, enabling the measurement of the mirror surface deflection angle in two directions. Real-time feedback of the mirror surface deflection angle in different directions can be achieved, improving the accuracy of mirror surface deflection angle control.

The invention discloses an internal feedback hydrostatic bearing static performance calculation method considering internal backflow, which comprises the following steps of: determining and inputting various basic parameters of a bearing, including a structure parameter, a hydraulic oil parameter and an oil supply pressure parameter, and dividing grid nodes at the same time; and determining node positions corresponding to the working oil cavity, the feedback oil cavity and the oil return groove according to the structural parameters of the bearing and the node number of the corresponding grids. Calculating the oil film thickness of the corresponding position of each node by using the bearing structure parameters; working oil cavity pressure and feedback oil cavity pressure are calculated based on the flow conservation principle; working oil cavity pressure serves as initial oil film pressure of the oil sealing edge, and oil film pressure distribution of the oil sealing edge is calculated through a finite difference method discrete Reynolds equation. Static performance including bearing capacity and stiffness is calculated based on the pressure distribution of the entire oil film. According to the method, the calculation precision of the oil cavity pressure, the oil sealing edge pressure, the bearing capacity of the bearing and the oil film rigidity is improved, and the theoretical calculation and experimental performance deviation is reduced.

The invention discloses a method, a system and a rack for testing fault conditions of a rear wheel steering gear, and belongs to the technical field of steering gears. The method comprises the following steps: applying maximum working load to left and right output ends of a rear wheel steering gear; a rear wheel steering gear is controlled to conduct steering action; in the steering action process of the rear wheel steering gear, the load applied to the rear wheel steering gear is rapidly reduced to zero, so that the displacement speed of a lead screw of the rear wheel steering gear exceeds a preset safety limit; acquiring a first feedback signal in the rear wheel steering gear; and according to the first internal feedback signal, checking whether the behavior after the displacement of the rear wheel steering gear is overspeed meets a first preset safety requirement or not. The displacement speed of a lead screw of the rear wheel steering gear exceeds the safety limit in a load sudden change mode, so that the working condition which can be solved by the required functions of the rear wheel steering gear is simulated, and whether the behavior of the rear wheel steering gear after displacement overspeed meets the first preset safety requirement or not is judged according to the first feedback signal; therefore, testing of functional requirements of the rear wheel steering gear is completed.

The present invention discloses a method for controlling static oil film thickness using internal feedback based on a PM flow controller. The method comprises a first oil tank, a second oil tank, a coarse oil filter, an oil pump, a servo motor, a fine oil filter, a one-way valve, a pilot electromagnetic relief valve, a PM flow controller, a guide rail, a first throttle, a second throttle, an upper static oil pad, a radial static oil pad, a lower static oil pad, and a static pressure worktable. Leveraging the advantages of the PM flow controller, the method increases oil chamber pressure and flow control when the load increases; conversely, decreases oil chamber pressure and flow control when the load decreases. The PM flow controller regulates flow solely by deforming the metal film with a pressure differential, requiring no external energy input or electronic control. The method ensures that the oil film remains constant for extended periods of time while the static pressure system is operating, and operates stably and reliably, ensuring efficient, stable, and long-term operation of the static pressure turntable.

A force control method and system for multi-motor synchronization is provided. The force control method includes: acquiring a total desired force of a plurality of motors; calculating the desired force of each of the plurality of motors according to a characteristic of each of the plurality of motors; setting an external feedback loop for controlling each of the plurality of motors to operate according to the desired force, and taking a synchronization error of each of the plurality of motors as a feedback item of the external feedback loop; and setting an internal feedback loop for controlling each of the plurality of motors to operate according to the desired force, and taking an output force error of each of the plurality of motors as a feedback item of the internal feedback loop. The force control method and system ensures multi-motor synchronization under the premise of accurate force control.

This invention discloses a pilot-operated internal feedback proportional cone valve and a hydraulic system. The pilot-operated internal feedback proportional cone valve includes a pilot valve, a main valve, and a mechanical feedback device. The pilot valve has a first valve chamber and includes a first valve stem movably disposed on the pilot valve along its axial direction. The main valve has a second valve chamber and a third valve chamber connected together, with the first valve chamber and the third valve chamber connected. The main valve also includes a second valve stem and a third valve stem. The second valve stem is movably disposed on the main valve along its axial direction, with a portion of the second valve stem located within the second valve chamber. The third valve stem is movably disposed on the main valve along its axial direction, with a portion of the third valve stem located within the third valve chamber. The first valve stem, the second valve stem, and the third valve stem are all drively connected to the mechanical feedback device. The pilot-operated internal feedback proportional cone valve of this invention has the advantages of high control accuracy.