4007results about How to "Reduce design difficulty" patented technology

The invention discloses a method for correcting and controlling a phase position of a brushless DC motor of a non-position sensor. The method is characterized by comprising the following steps: (1) at least one sampling point is arranged at intervals between the starting rotating speed and the rated rotating speed of the motor, the relation curve of the speed and the phase position delay is mapped by recording the value of the electrical angle corresponding to the phase position delay; (2) the motor control program is written, the phase position delay compensating program is added into the signal process of the acquired BEMF so that the phase is switched at the accurate phase-changing point; (3) the motor is started in the way of positioning first and then accelerating slowly; and (4) when the motor reaches the starting rotating speed, the BEMF zero-crossing signal is acquired, and the calculation compensation is performed by the phase position compensating sub program written in the motor control program and the phase changing control sub program. The method has the advantages of simplicity and flexibility, and particularly can correct the phase position lagging caused by the position detection circuit in real time. The method can be widely applied to the phase position correction control of the brushless DC motor of various non-position sensors.

The invention provides a zero-sequence current suppression method of open type permanent magnet synchronous motor with double-inverter power supply, belongs to the technical field of motor control, and aims at solving the problem of zero-sequence current of the open type permanent magnet synchronous motor with the double-inverter power supply. The method is characterized in that the closed loop control for zero-sequence current i0=0 is added on the basis of a vector control system, so as to realize the suppression of the zero-sequence current; the zero-sequence current is calculated by detecting the three-phase current of the motor and is treated as the feedback quantity to build the closed loop control of the zero-sequence current; the output of a zero-sequence current ring is specified by zero-sequence voltage, and the zero-sequence current is suppressed by adjusting the zero-sequence voltage produced by the double inverters. The method is applied to the suppression of the zero-sequence current in the open type permanent magnet synchronous motor with double-inverter power supply.

The invention relates to a variable-frequency power source based on the control of a digital signal processor, which comprises a switch power source module, a control circuit, a circuit for isolating and shaping pulse-width modulating signal, IPM inverting circuits, a circuit for detecting and protecting busbar voltage, a rectification input slow-start circuit, a communication circuit, an interface circuit for isolating and inputting parallel signals and an human-computer interface circuit for displaying the key. The invention adopts the structure of a single digital signal processor (DSP) coupled with the double IPM inverting circuits, provides two paths of independent variable-frequency power sources for two sets of asynchronous motors at the same time and carries out independent speed regulations to the two sets of asynchronous motors. The variable-frequency power source of the invention has the advantages of small volume, low power consumption, high reliability and being convenient for bulk production, etc., and adopts an appropriate switch frequency and an advanced voltage space vector pulse width modulation algorithm (SVPWM), thereby lowering the noise during the operation of the asynchronous motors and increasing the voltage utilization rate, with obvious effect on energy saving.

The embodiment of the invention provides a mixed dielectric waveguide filter. The mixed dielectric waveguide filter comprises a first three-mode resonator (1), a second three-mode resonator (3) and a single-mode resonator (2), wherein the face, making contact with the single-mode resonator (2), of the first three-mode resonator (1), and he face, making contact with the single-mode resonator (2), of the second three-mode resonator (3) are respectively provided with coupling windows (18 and 38), and dielectric of all the resonators is exposed, and used for coupling between the first three-mode resonator (1) and the single-mode resonator (2) as well as between the second three-mode resonator (3) and the single-mode resonator (2). According to the mixed dielectric waveguide filter, interference between the three-mode resonators can be reduced, and the topological structure is flexible, simple and easy to assemble.

The invention discloses a lamination device which comprises an unwinding and winding mechanism, a tape travelling mechanism, a sheet conveying mechanism, a performing mechanism, a lamination mechanism and a trimming mechanism, wherein the unwinding and winding mechanism is controlled to unwind and wind diaphragms as well as positive and negative pole piece tapes in accordance with a preset superposition sequence; the tapes are conveyed to the lamination mechanism by the tape travelling mechanism; the sheet conveying mechanism is controlled to stack the positive and negative pole pieces alternatively on the tapes on the lamination mechanism; before the preset thickness is obtained, after each lamination is stacked, the performing mechanism is controlled to firmly press the part of the tapebelow the pole piece; the tape travelling mechanism is controlled to move back so as to fold the free part of the tape and cover the pole piece; and the trimming mechanism is controlled to cut the tape when the lamination reaches the preset thickness. The invention also discloses a lamination method. As the wound tapes and the formed pole pieces are laminated simultaneously, the lamination efficiency in cell manufacturing is greatly improved.

The invention discloses a compressed air energy storage system using carbon dioxide as a working medium. The system utilizes the supercritical characteristic of carbon dioxide and the state change characteristic of the carbon dioxide near the critical point, and the assistance by the conditions of outside environments (such as underground and seabed cavities) is not needed, so the switching of the energy storage system among constant-pressure energy storage, constant-pressure energy releasing, constant-capacity energy storage and constant-capacity energy releasing is realized, and the different types of power storage and releasing can be realized. The system utilizes the characteristic of the carbon diode which is converted from the gas state into the supercritical or liquid state, so the carbon dioxide is stored, and compared with the gas storage, the complicated degree and design difficulty of the system are effectively reduced, and the cost of the energy storage system is reduced. Meanwhile, the double-storage device method is adopted, the switching of the system between energy storage and energy releasing is flexibly completed without utilizing the assistance by the outside environments (such as underground and seabed cavities), the energy storage and energy releasing characteristics of the system are changed by controlling the carbon dioxide storage/releasing method, and the flexibility of the system is enhanced. The system can be used together with the renewable energy sources, such as solar energy and wind energy, so the generation of other pollutants is avoided, and the environment-friendly characteristic is good.

The invention discloses a control system for a modular multilevel converter and an application method of the control system. The control system for the modular multilevel converter comprises a master control unit, M1 bridge arm control units, a group of high-speed digital buses and a group of communication buses, wherein each bridge arm control unit comprises M2 valve group control units; and each valve group control unit is used for controlling the use, the removal, the bypassing and the lockout of sub-modules in a corresponding valve group through an optical fiber, and electrically isolating the sub-modules. A sub-module voltage balancing algorithm for the modular multilevel converter consists of an intra-valve group voltage balancing part and an inter-valve group voltage balancing part. The control system and the application method are used for controlling and managing the use, the removal, the bypassing and the lockout of the sub-modules of the modular multilevel converter to realize the voltage balancing of the sub-modules of the modular multilevel converter, are applied to an application situation where the modular multilevel converter has a great number of sub-modules, and have the characteristics of modular design and high expansibility, and the design difficulty of the control system can be greatly reduced.

The invention relates to a partial-compensation aspherical reflector surface shape detection method, which comprises the following steps of demarcating partial-compensation elements to obtain demarcated phase distribution Wb; using the demarcated phase distribution Wb, sphere theory wavefront Wq and aspherical theory wavefront Wf to obtain phase distribution Wy of digital virtual sample plates; measuring an aspherical reflector surface to be measured to obtain phase distribution Wa; and reducing the phase distribution Wy from the measured phase distribution Wa to achieve surface shape error distribution Wm of the aspherical surface. The partial-compensation aspherical reflector surface shape detection method can accurately measure optical aspherical surface shapes by using a single partial-compensation element, thereby reducing design difficulty of a compensator, simplifying structure of the compensator and being clear in physical definition, simple in data processing and arithmetical operation, simple and practical in experimental operation, low in detection cost and short in test time.

The invention is suitable for the field of radio frequency communication, and provides a double-stage inversing D-class power amplifying circuit and a radio frequency power amplifier. The circuit comprises an input passive component connected with a block condenser, a positive and negative double-way driving-stage F-class amplifier, a positive and negative double-way amplifying-stage inversing F-class amplifier and an output passive component, wherein the two input ends of the positive and negative double-way driving-stage F-class amplifier are connected with the two output ends of the input passive component through two block coupling condensers, the two input ends of the positive and negative double-way amplifying-stage inversing F-class amplifier are connected with the two output ends of the positive and negative double-way driving-stage F-class amplifier through two condensers, and the two input ends of the output passive component are connected with the two output ends of the positive and negative double-way amplifying-stage inversing F-class amplifier through the two condensers. By utilizing an F-class driving inversing F-class push-pull structure, according to the harmonic shaping technology, the efficiency, the power and the gain of the power amplifier are improved, the independent control from a fundamental wave to a triple frequency harmonic impedance is achieved, the design difficulty is lowered, and the tedious debugging work in the later period is lowered. In addition, due to the positive and negative double-way structural design, the power and the gain are further improved.

The invention relates to a zero-force control method and system for a robot. The zero-force control method comprises the following steps: S1, a robot kinetic model is built on the basis of inertia force, centrifugal force, coriolis force, viscous friction force, static friction force and gravity; S2, external force moments of all the joints of the robot are calculated on the basis of the robot kinetic model and feedback data; S3, a speed command is calculated according to the external force moments calculated in the step 2; and S4, a position command is calculated according to the speed command and position feedback. Through the building of the kinetic model, the external force moments of all the joints can be directly calculated, without the assistance of a power-assisted sensor or a torque sensor, so that the cost and the complexity of the system are reduced; by the adoption of a position command control manner instead of a direct torque control manner, the design difficulty in the safety and the stability of the system is reduced; and in addition, since inertia force is considered when the external force moments are calculated, the zero-force control method and system can be suitable for robots with greater dead weight.

The invention discloses a flocculation washing machine. The flocculation washing machine comprises an outer barrel, a flocculation unit and a filtering unit which are circularly communicated in a sequence through pipelines. The washing machine further comprises an air pump which is respectively communicated with the flocculation unit and the filtering unit. According to the flocculation washing machine, air generated by the air pump is conveyed into a flocculation container through the same air pump so as to generate a mass of bubbles in the water into the flocculation container, thus the water fully flow to enable fully mixing of a flocculant and washed water to achieve flocculation reaction; in addition, the air exhausted by the air pump can be conveyed into a filtering container during washing a filtering unit to generate bubbles to drive water in the filtering container to fully flow as well as generating an instantaneous impact force to act on the surface of a filtering screen, so as to separate dirt attached on the surface of the filtering screen, and as a result, the filtering effect of the filtering screen can be improved. The flocculation washing machine is high in automation degree and simple in structure and saves the production cost.

The invention discloses a holographic optical waveguide, and belongs to the technical field of augmented reality and virtual reality. The holographic optical waveguide comprises a planar optical waveguide, and an optical coupling in end and an optical coupling out end which are respectively arranged at the two ends of the planar optical waveguide. The optical coupling in end reflects received light rays so that the reflected light rays are enabled to meet the total reflection conditions to be transmitted to the optical coupling out end through multiple times of total reflection between the two reflecting surfaces of the planar optical waveguide. The received light rays are diffractively emergent out of the optical coupling out end. The optical coupling out end is a holographic grating. The holographic grating is a polarization holographic liquid crystal grating comprising a transparent substrate, a light orientation layer and a liquid crystal layer which are arranged in turn, wherein polarization holographic patterns having periodic structures are recorded on the light orientation layer. The invention also discloses a holographic optical waveguide display device. The polarization holographic liquid crystal grating is used as the optical coupling out end of the holographic optical waveguide so that 100% of diffraction efficiency can be achieved theoretically, and zero order waves can be suppressed and conjugate images can be eliminated.

The embodiment of the invention provides a digital FNPLL (Fractional-N Phase-Locked Loop) control method and a PLL (Phase-Locked Loop). The PLL comprises a control device, a TDC (Time-to-Digital Converter), a DLF (Digital Loop Filter), a DCO (Digital Controlled Oscillator), a DIV (Frequency Divider) and an SDM (Sigma-Delta Modulator), wherein the control device is used for carrying out delay processing on an effective edge of a reference clock according to a frequency control word and a fractional frequency control word to obtain a delayed reference clock; the delayed reference clock is sent to the TDC for enabling the TDC to carry out phase detection processing on the delayed reference clock and a feedback clock. According to the PLL provided by the invention, the control device which is additionally arranged in the PLL can be used for carrying out the delay processing on the reference clock according to the current frequency control word and the fractional frequency control word, so that the feedback clock and the delayed reference clock are enabled to have similar effective edge corresponding time, the TDC just needs to process phase detection signals in a very small time-domain input range, the design difficulty of the TDC and the needs on the resolution rate of the TDC are greatly reduced, the design of the TDC can be simple and free, and the design DOF (Degree Of Freedom), the simplicity and the effectiveness of the PLL are ensured.

The invention provides a double-channel real-time bioaerosol monitoring method and a device thereof. The method is characterized by comprising the following steps: (1) concentrating atmospheric aerosol particles; (2) carrying out double-channel ultraviolet induced fluorescence detection; (3) data-processing; (4) cleaning the surface of an enrichment board of the particles and regenerating; and (5) repeatedly carrying out a new round of loop detection. The device comprises an aerosol-particles concentration unit, a double-channel ultraviolet induced fluorescence detection unit, a particle enrichment board regeneration mechanism, a rotary table and a control system. The invention can measure the density and the change of bio-particles such as bacteria, spores, viruses and the like in an ambient atmosphere in real time so as to achieve an early warning function on bioaerosol content in the atmosphere.

The invention discloses a dual-polarization radiating element comprising a metal reflection baseplate and two pairs of vibrators arranged on the metal reflection baseplate, wherein vibrator arms of each pair of vibrators are mutually parallel or in the same line, and vibrator arms between the two pairs of vibrators are mutually perpendicular. The invention also discloses a broadband base station antenna which is formed by the linear arrangement of a plurality of dual-polarization radiating elements. The dual-polarization radiating element disclosed by the invention has the following advantages that the shapes of the vibrator arms are matched with a feeding mode of the vibrators, an integral forming mode of the stamping and bending of a metal plate is adopted, and the cost is greatly reduced; and the space between the vibrators is increased, meanwhile, the distance between the radiating elements is also increased, therefore the design difficulty of the partition degree of the antennae is reduced; and the characteristics of simple and compact structure, high performance, easiness of manufacture, convenience for installation and use, wide bandwidth, high gain, favorable cross polarization ratio, and favorable partition performance are achieved.

A solid-state imaging device includes: a semiconductor layer having a first surface and a second surface that oppose each other; and a plurality of photodiodes stacked in the semiconductor layer. One or more photodiodes of the plurality of photodiodes also serve as a transfer path of a signal charge accumulated in other photodiodes.

The invention discloses a reflective ultrasonic anemoscope and a measuring method thereof. The reflective ultrasonic anemoscope comprises four parts, namely a probe mounting seat (1), ultrasonic probes (21, 22, 23 and 24), a bracket (3) and a reflecting surface (4), wherein the four ultrasonic probes (21, 22, 23 and 24) are fixedly arranged on the probe mounting seat (1), are divided into two groups and are arranged on two orthogonal axes; and various ultrasonic probes (21, 22, 23 and 24) transmit ultrasonic signals in turn, and opposite ultrasonic probes (21, 22, 23 and 24) receive signals reflected by the reflecting surface (4). A wind speed value and a wind direction value are solved by a vector composition method. The reflective ultrasonic anemoscope eliminates influence on measurement due to a difficultly fixed measuring structure and great change of signal intensity along with the wind speed.

The invention relates to a method for detecting surface figures of a large-aperture off-axis convex aspheric mirror. The method comprises the following steps of: performing null interferometry on reference sub-aperture regions by using computer-generated holographic elements which correspond to surface figures of the reference sub-aperture regions of an aspheric mirror to be detected; performing null interferometry on off-axis sub-aperture regions by using computer-generated holographic elements which correspond to surface figures of the off-axis sub-aperture regions of the aspheric mirror to be detected: solving the distribution of full-aperture surface figures of the convex aspheric mirror to be detected; converting coordinates of all off-axis sub-apertures in an x-y-z coordinate system into coordinates below an X-Y-Z coordinate system and obtaining the distribution of full-aperture phases of the convex aspheric mirror to be detected by calculation; and removing system adjustment errors from the distribution of the full-aperture phases to obtain the error distribution of the full-aperture surface figures of the convex aspheric mirror to be detected. The invention has the advantages of simple data processing and mathematical operation, easy experiment operation, low detection cost and short testing time.